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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\SvgToPdf; |
| 6 | |
| 7 | use Phpdftk\Color\CmykColor; |
| 8 | use Phpdftk\Color\ColorInterface; |
| 9 | use Phpdftk\Color\GrayColor; |
| 10 | use Phpdftk\Color\RgbColor; |
| 11 | use Phpdftk\Css\Shape\BasicShapePath; |
| 12 | use Phpdftk\Css\Value\BasicShape; |
| 13 | use Phpdftk\Css\Value\Keyword as CssKeyword; |
| 14 | use Phpdftk\Css\Value\ValueList; |
| 15 | use Phpdftk\Css\Cascade\CalcEvaluator; |
| 16 | use Phpdftk\Css\Cascade\LengthContext; |
| 17 | use Phpdftk\Css\Value\Calc; |
| 18 | use Phpdftk\Css\ValueParser; |
| 19 | use Phpdftk\Filesystem\LocalFilesystem; |
| 20 | use Phpdftk\ImageMetadata\ImageParser; |
| 21 | use Phpdftk\ResourceLoader\Exception\FetchFailedException; |
| 22 | use Phpdftk\ResourceLoader\Exception\SsrfBlockedException; |
| 23 | use Phpdftk\ResourceLoader\ResourceLoader; |
| 24 | use Phpdftk\Pdf\Core\Content\ContentStream; |
| 25 | use Phpdftk\Pdf\Core\Document\GroupAttributes; |
| 26 | use Phpdftk\Pdf\Core\Graphics\ExtGState; |
| 27 | use Phpdftk\Pdf\Core\Graphics\SoftMask; |
| 28 | use Phpdftk\Pdf\Core\Graphics\XObject\FormXObject; |
| 29 | use Phpdftk\Pdf\Core\PdfArray; |
| 30 | use Phpdftk\Pdf\Core\PdfName; |
| 31 | use Phpdftk\Pdf\Core\PdfNumber; |
| 32 | use Phpdftk\Pdf\Core\PdfReference; |
| 33 | use Phpdftk\Pdf\Writer\Page; |
| 34 | use Phpdftk\Pdf\Writer\PdfWriter; |
| 35 | use Phpdftk\SvgToPdf\Gradient\GradientPainter; |
| 36 | use Phpdftk\SvgToPdf\Text\DocumentFont; |
| 37 | use Phpdftk\SvgToPdf\Text\DocumentFontProvider; |
| 38 | use Phpdftk\SvgToPdf\Text\FontResolver; |
| 39 | use Phpdftk\Svg\ClipPath; |
| 40 | use Phpdftk\Svg\Defs; |
| 41 | use Phpdftk\Svg\Element; |
| 42 | use Phpdftk\Svg\Image as SvgImage; |
| 43 | use Phpdftk\Svg\Marker; |
| 44 | use Phpdftk\Svg\Mask; |
| 45 | use Phpdftk\Svg\Symbol; |
| 46 | use Phpdftk\Svg\Use_; |
| 47 | use Phpdftk\SvgToPdf\Geometry\BoundingBox; |
| 48 | use Phpdftk\Svg\Value\Paint\ContextPaint; |
| 49 | use Phpdftk\SvgToPdf\Path\MarkerVertex; |
| 50 | use Phpdftk\SvgToPdf\Path\MarkerVertices; |
| 51 | use Phpdftk\SvgToPdf\Path\PathLengthMeasure; |
| 52 | use Phpdftk\Svg\Path; |
| 53 | use Phpdftk\Svg\Pattern; |
| 54 | use Phpdftk\Svg\Path\ArcTo; |
| 55 | use Phpdftk\Svg\Path\ClosePath; |
| 56 | use Phpdftk\Svg\Path\CurveTo; |
| 57 | use Phpdftk\Svg\Path\HorizontalLineTo; |
| 58 | use Phpdftk\Svg\Path\LineTo; |
| 59 | use Phpdftk\Svg\Path\MoveTo; |
| 60 | use Phpdftk\Svg\Path\PathCommand; |
| 61 | use Phpdftk\Svg\Path\QuadraticCurveTo; |
| 62 | use Phpdftk\Svg\Path\SmoothCurveTo; |
| 63 | use Phpdftk\Svg\Path\SmoothQuadraticCurveTo; |
| 64 | use Phpdftk\Svg\Path\VerticalLineTo; |
| 65 | use Phpdftk\Svg\Shape\Circle; |
| 66 | use Phpdftk\Svg\Shape\Ellipse; |
| 67 | use Phpdftk\Svg\Shape\Line; |
| 68 | use Phpdftk\Svg\Shape\Polygon; |
| 69 | use Phpdftk\Svg\Shape\Polyline; |
| 70 | use Phpdftk\Svg\Shape\Rect; |
| 71 | use Phpdftk\Svg\Parser as SvgDocumentParser; |
| 72 | use Phpdftk\Svg\SvgDocument; |
| 73 | use Phpdftk\Svg\View as SvgView; |
| 74 | use Phpdftk\Svg\Text as TextNode; |
| 75 | use Phpdftk\Text\TextTransform; |
| 76 | use Phpdftk\Svg\Text\TextElement; |
| 77 | use Phpdftk\Svg\Value\Transform; |
| 78 | use Phpdftk\Svg\Value\TransformOrigin; |
| 79 | use Phpdftk\Svg\Value\Paint; |
| 80 | use Phpdftk\Svg\Value\Color as SvgColor; |
| 81 | use Phpdftk\Svg\Value\Paint\CurrentColor; |
| 82 | use Phpdftk\Svg\Value\Paint\None_; |
| 83 | use Phpdftk\Svg\Value\Paint\SolidColor; |
| 84 | use Phpdftk\Svg\Value\Paint\Url; |
| 85 | use Phpdftk\SvgToPdf\Path\ArcToCubic; |
| 86 | use Phpdftk\SvgToPdf\Path\PathPainterState; |
| 87 | |
| 88 | /** |
| 89 | * Translates a parsed `Phpdftk\Svg\SvgDocument` into PDF content-stream |
| 90 | * operators. The translator is a thin recursive walk: each element is |
| 91 | * dispatched to a per-shape painter that emits the right path and |
| 92 | * `f`/`S`/`B` operator combination. |
| 93 | * |
| 94 | * Coordinate convention: SVG and PDF disagree on Y-axis direction (SVG |
| 95 | * Y-down, PDF Y-up). The translator emits SVG coordinates verbatim — the |
| 96 | * caller is responsible for setting up a PDF transformation (`cm`) that |
| 97 | * flips and translates if it wants the SVG to appear at a specific PDF |
| 98 | * position. Tests can paint directly into a fresh PDF stream because the |
| 99 | * default user space happens to put numbers in a viewable range for small |
| 100 | * SVGs. |
| 101 | * |
| 102 | * What 3K covers: basic shapes (`<rect>`, `<circle>`, `<ellipse>`, |
| 103 | * `<line>`, `<polyline>`, `<polygon>`) and the SolidColor fill / stroke |
| 104 | * paint cases. `<path>` lands in 3L, `<g>` + transforms in 3M, gradients |
| 105 | * in 3O, text in 3P, use/clip/mask/image in 3Q. Until then unrecognised |
| 106 | * elements are walked through transparently — their children paint as if |
| 107 | * the unknown container weren't there. |
| 108 | * |
| 109 | * Default paint per SVG 2 §13.2.1: black fill, no stroke. The translator |
| 110 | * applies that fallback when no explicit fill is set on the element. |
| 111 | */ |
| 112 | final class Translator |
| 113 | { |
| 114 | /** |
| 115 | * Cubic-Bézier "magic number" approximating a unit-circle quarter |
| 116 | * arc — `(4/3) · tan(π/8) ≈ 0.5522847498`. Standard κ for |
| 117 | * `<circle>` / `<ellipse>` rendering. |
| 118 | */ |
| 119 | private const float KAPPA = 0.5522847498; |
| 120 | |
| 121 | /** |
| 122 | * Longest `<pattern href>` template chain the translator follows |
| 123 | * before giving up. SVG 2 places no explicit cap; this one exists |
| 124 | * purely so a pathological document can't make resolution quadratic. |
| 125 | */ |
| 126 | private const int MAX_PATTERN_TEMPLATE_DEPTH = 16; |
| 127 | |
| 128 | /** |
| 129 | * How deep `<image href="…svg">` references may nest before the |
| 130 | * painter stops descending. An SVG resource can reference another |
| 131 | * SVG resource that references it back; SVG 2 §8.6 forbids |
| 132 | * rendering such a cycle, and a hard cap is the cheapest way to |
| 133 | * guarantee termination when the cycle runs through `data:` URIs |
| 134 | * that are never identity-equal. |
| 135 | */ |
| 136 | private const int MAX_EMBEDDED_SVG_DEPTH = 8; |
| 137 | |
| 138 | /** |
| 139 | * SVG 2 §13.3 — the `<pattern>` attributes a referencing pattern |
| 140 | * inherits from its `href` template when it does not specify them |
| 141 | * itself. `href` / `xlink:href` are deliberately absent: the chain |
| 142 | * is already walked, and copying them onto the merged result would |
| 143 | * make it self-referential. |
| 144 | * |
| 145 | * @var list<string> |
| 146 | */ |
| 147 | private const array PATTERN_INHERITED_ATTRIBUTES = [ |
| 148 | 'x', |
| 149 | 'y', |
| 150 | 'width', |
| 151 | 'height', |
| 152 | 'patternUnits', |
| 153 | 'patternContentUnits', |
| 154 | 'patternTransform', |
| 155 | 'viewBox', |
| 156 | 'preserveAspectRatio', |
| 157 | ]; |
| 158 | |
| 159 | /** |
| 160 | * Optional `phpdftk/resource-loader` for `http(s)://` `<image>` |
| 161 | * hrefs. When `null` (the default — preserves existing call- |
| 162 | * site behaviour), network hrefs drop silently per the SVG 2 |
| 163 | * §12.6 "no image available" outcome. When supplied, the |
| 164 | * loader runs (with its SSRF guard, redirect handling, body |
| 165 | * cap, and MIME sniffing) and the embedded bytes get |
| 166 | * materialised to a temp file the same way `data:` URIs do. |
| 167 | */ |
| 168 | public function __construct( |
| 169 | private readonly ?ResourceLoader $resourceLoader = null, |
| 170 | /** |
| 171 | * Optional seam through which an embedding document (HTML, at |
| 172 | * present) supplies its own font matching + PDF font handles. |
| 173 | * When null - or when it declines a particular request - SVG |
| 174 | * text falls back to the built-in standard-14 |
| 175 | * {@see FontResolver}. |
| 176 | */ |
| 177 | private readonly ?DocumentFontProvider $documentFontProvider = null, |
| 178 | /** |
| 179 | * Projects a referenced document's `<style>` cascade into its |
| 180 | * elements' `style` attributes before an embedded SVG is |
| 181 | * painted — the referenced resource never went through |
| 182 | * {@see SvgRenderer::draw}, which is where the host document |
| 183 | * gets the same treatment. |
| 184 | */ |
| 185 | private readonly SvgCascadeProjector $cascadeProjector = new SvgCascadeProjector(), |
| 186 | ) { |
| 187 | $this->useExpansionsInProgress = new \SplObjectStorage(); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * How many `<image href="…svg">` hops led to this translator. |
| 192 | * Zero for the host document; incremented for each embedded |
| 193 | * resource so {@see MAX_EMBEDDED_SVG_DEPTH} can terminate cycles. |
| 194 | */ |
| 195 | private int $embeddedSvgDepth = 0; |
| 196 | |
| 197 | /** |
| 198 | * Paint a parsed SVG document into the given content stream. |
| 199 | * |
| 200 | * When `$page` is supplied, the painter registers an `ExtGState` |
| 201 | * resource on that page for any element that carries `opacity`, |
| 202 | * `fill-opacity`, or `stroke-opacity` < 1 and emits the `gs` |
| 203 | * operator to invoke it. Without a `$page` reference opacity |
| 204 | * attributes are silently ignored — the painter falls back to |
| 205 | * fully-opaque rendering. |
| 206 | * |
| 207 | * When `$page` AND `$writer` are both supplied, gradient paint |
| 208 | * references (`fill="url(#id)"`) resolve through the writer's |
| 209 | * `PdfDoc` for shading registration and the page's |
| 210 | * `useGradient` for resource attachment. Without them, gradient |
| 211 | * fills fall back to no paint per SVG 2's "invalid → no paint" |
| 212 | * semantics. |
| 213 | */ |
| 214 | /** |
| 215 | * @param array{w: float, h: float}|null $effectiveViewport |
| 216 | * Override viewport for inner percentage-attribute resolution |
| 217 | * when the document's own width/height/viewBox don't yield |
| 218 | * useful dimensions. Set by `SvgRenderer::draw` when it |
| 219 | * synthesises a source rect from the destination. |
| 220 | * @param array{float, float, float, float, float, float}|null $baseMatrix |
| 221 | * The SVG→page base transform the caller applied to `$stream` |
| 222 | * (viewport scale + y-flip + placement); seeds the cumulative |
| 223 | * matrix stack so gradient pattern `/Matrix` entries track the CTM. |
| 224 | * Null (direct-render tests) seeds the identity. |
| 225 | */ |
| 226 | public function paint( |
| 227 | SvgDocument $document, |
| 228 | ContentStream $stream, |
| 229 | ?Page $page = null, |
| 230 | ?PdfWriter $writer = null, |
| 231 | bool $compensateTextFlip = false, |
| 232 | ?array $effectiveViewport = null, |
| 233 | ?array $baseMatrix = null, |
| 234 | ): void { |
| 235 | $this->page = $page; |
| 236 | $this->writer = $writer; |
| 237 | $this->document = $document; |
| 238 | $this->compensateTextFlip = $compensateTextFlip; |
| 239 | $this->effectiveViewport = $effectiveViewport; |
| 240 | // CSS Values 4 §6.1 — `vw` / `vh` / `vmin` / `vmax` resolve |
| 241 | // against the INITIAL containing block, which for an SVG |
| 242 | // document is its outermost viewport. Capture it here, with |
| 243 | // the nested-viewport stack empty, so a `<svg>` nested inside |
| 244 | // the document can't shadow it. |
| 245 | $this->viewportStack = []; |
| 246 | $this->rootViewport = $this->currentViewport(); |
| 247 | // Seed the cumulative-transform stack with the renderer's base matrix |
| 248 | // (viewport scale + y-flip + page placement) so gradient patterns can |
| 249 | // reconstruct the SVG→page mapping the caller applied to the stream. |
| 250 | $this->matrixStack = [$baseMatrix ?? [1.0, 0.0, 0.0, 1.0, 0.0, 0.0]]; |
| 251 | $this->gradientPainter = $page !== null && $writer !== null |
| 252 | ? new GradientPainter($writer, $page, $document) |
| 253 | : null; |
| 254 | $this->fontResolver = $page !== null && $writer !== null |
| 255 | ? new FontResolver($writer, $page) |
| 256 | : null; |
| 257 | // SVG 2 §8.4 — `transform` applies to the OUTERMOST `<svg>` as |
| 258 | // well, and transforms everything inside it. The root never |
| 259 | // goes through `paintElement()`, so its own transform has to be |
| 260 | // concatenated here. It composes BEFORE the viewBox origin |
| 261 | // shift: the viewBox coordinate system is what the root |
| 262 | // transform acts on. |
| 263 | // |
| 264 | // Resolved before the `try` so the `finally` that unwinds it |
| 265 | // can never see an unassigned variable. |
| 266 | $rootTransform = $document->transform(); |
| 267 | $rootMatrix = $rootTransform === null |
| 268 | ? null |
| 269 | : $this->transformMatrixFor($document, $rootTransform); |
| 270 | try { |
| 271 | if ($rootMatrix !== null) { |
| 272 | $stream->saveGraphicsState(); |
| 273 | $stream->concatMatrix( |
| 274 | $rootMatrix[0], |
| 275 | $rootMatrix[1], |
| 276 | $rootMatrix[2], |
| 277 | $rootMatrix[3], |
| 278 | $rootMatrix[4], |
| 279 | $rootMatrix[5], |
| 280 | ); |
| 281 | $this->pushMatrix($rootMatrix); |
| 282 | } |
| 283 | $viewBox = $document->viewBox(); |
| 284 | if ( |
| 285 | $baseMatrix === null |
| 286 | && $viewBox !== null |
| 287 | && ($viewBox[0] !== 0.0 || $viewBox[1] !== 0.0) |
| 288 | ) { |
| 289 | // SVG 2 §7.7 — the viewBox's `min-x`/`min-y` shift the |
| 290 | // origin of the local coordinate system. The proper |
| 291 | // viewBox-to-viewport mapping (with `preserveAspectRatio`) |
| 292 | // needs a caller-supplied target rectangle, so it lives |
| 293 | // in the 3R adapter layer; here we honour just the |
| 294 | // translation so the painted content stays anchored |
| 295 | // correctly relative to the viewBox. |
| 296 | // |
| 297 | // ONLY when the caller did not hand us a `$baseMatrix`. |
| 298 | // `SvgRenderer::draw` already folds the shift into the |
| 299 | // matrix it concatenates (`e = x + offsetX - minX * sx`), |
| 300 | // so doing it again here translated the content a second |
| 301 | // time — and UNSCALED, which pushed every document with a |
| 302 | // non-zero viewBox min-x clean off the page and rendered |
| 303 | // it blank. |
| 304 | $stream->saveGraphicsState(); |
| 305 | $stream->concatMatrix(1.0, 0.0, 0.0, 1.0, -$viewBox[0], -$viewBox[1]); |
| 306 | $this->pushMatrix([1.0, 0.0, 0.0, 1.0, -$viewBox[0], -$viewBox[1]]); |
| 307 | $this->paintChildren($document, $stream); |
| 308 | $this->popMatrix(); |
| 309 | $stream->restoreGraphicsState(); |
| 310 | return; |
| 311 | } |
| 312 | $this->paintChildren($document, $stream); |
| 313 | } finally { |
| 314 | if ($rootMatrix !== null) { |
| 315 | $this->popMatrix(); |
| 316 | $stream->restoreGraphicsState(); |
| 317 | } |
| 318 | $this->page = null; |
| 319 | $this->writer = null; |
| 320 | $this->document = null; |
| 321 | $this->gradientPainter = null; |
| 322 | $this->fontResolver = null; |
| 323 | $this->activeFont = null; |
| 324 | $this->compensateTextFlip = false; |
| 325 | $this->effectiveViewport = null; |
| 326 | $this->rootViewport = null; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | private ?Page $page = null; |
| 331 | private ?PdfWriter $writer = null; |
| 332 | /** @var array{w: float, h: float}|null */ |
| 333 | private ?array $effectiveViewport = null; |
| 334 | private ?SvgDocument $document = null; |
| 335 | /** |
| 336 | * Stack of nested `<svg>` viewports (viewBox units), innermost last. |
| 337 | * Percentage lengths + `currentViewport()` resolve against the top. |
| 338 | * |
| 339 | * @var list<array{w: float, h: float}> |
| 340 | */ |
| 341 | private array $viewportStack = []; |
| 342 | |
| 343 | /** |
| 344 | * `<clipPath>` elements currently being reified into a clip region, |
| 345 | * innermost last. Guards {@see emitClipRegion} against `clip-path` |
| 346 | * reference cycles between clipPath elements. |
| 347 | * |
| 348 | * @var list<ClipPath> |
| 349 | */ |
| 350 | private array $clipPathStack = []; |
| 351 | /** |
| 352 | * The document's OUTERMOST viewport — the initial containing block |
| 353 | * the `vw` / `vh` / `vmin` / `vmax` units resolve against (CSS |
| 354 | * Values 4 §6.1). Captured once per {@see paint()} so a nested |
| 355 | * `<svg>` viewport can't shadow it the way it shadows `%`. |
| 356 | * |
| 357 | * @var array{w: float, h: float}|null |
| 358 | */ |
| 359 | private ?array $rootViewport = null; |
| 360 | /** |
| 361 | * A `<use>`'s width/height override for the viewport element it |
| 362 | * references (SVG 2 §5.6.2), consumed by the next |
| 363 | * `paintViewportInstance`. |
| 364 | * |
| 365 | * Each axis is independent: `<use width="90">` on a 10x10 |
| 366 | * `<symbol>` overrides only the width, so the instance is 90x10. |
| 367 | * Treating the override as all-or-nothing silently dropped the |
| 368 | * single-axis form. |
| 369 | * |
| 370 | * @var array{w: float|null, h: float|null}|null |
| 371 | */ |
| 372 | private ?array $pendingUseViewport = null; |
| 373 | |
| 374 | /** |
| 375 | * SVG 2 §13.2.1 — the paint `context-fill` / `context-stroke` |
| 376 | * inside the subtree currently being painted defer to, or null |
| 377 | * when that subtree was not reached through a reference. |
| 378 | */ |
| 379 | private ?ContextElementPaint $contextPaint = null; |
| 380 | /** |
| 381 | * Referenced elements whose `<use>` expansion is currently on the |
| 382 | * stack, keyed by identity. |
| 383 | * |
| 384 | * SVG 2 §5.6.2 — a circular `<use>` reference must not be rendered. |
| 385 | * The ancestor test in `paintUse` catches the direct form |
| 386 | * (`<g id="a"><use href="#a"/></g>`), but two `<use>` elements can |
| 387 | * also reference each other's containers, where neither referent is |
| 388 | * an ancestor of its own `<use>`. This re-entrancy set closes that: |
| 389 | * a referent already being painted is not painted again. |
| 390 | * |
| 391 | * Keyed on the REFERENT, not the `<use>`, and cleared on the way |
| 392 | * out, so the same target referenced twice in sequence still expands |
| 393 | * both times. |
| 394 | * |
| 395 | * @var \SplObjectStorage<Element, bool> |
| 396 | */ |
| 397 | private \SplObjectStorage $useExpansionsInProgress; |
| 398 | private ?GradientPainter $gradientPainter = null; |
| 399 | private ?FontResolver $fontResolver = null; |
| 400 | /** |
| 401 | * Font selected for the `<text>` element currently being painted. |
| 402 | * Set by {@see paintTextElement} before any `Tj` is emitted and read |
| 403 | * by {@see showTextRun} so the shadow, single-run and per-glyph |
| 404 | * paths all agree on how to encode the string. |
| 405 | */ |
| 406 | private ?DocumentFont $activeFont = null; |
| 407 | private bool $compensateTextFlip = false; |
| 408 | /** |
| 409 | * Stack of cumulative affine transforms (outer→inner) mapping the CURRENT |
| 410 | * SVG user space to PDF page space — seeded in {@see paint()} with the |
| 411 | * renderer's base matrix (viewport scale + y-flip + placement) and grown |
| 412 | * by each `<svg>` viewport, element `transform`, and `<use>` translate as |
| 413 | * painting descends. Its top is threaded into gradient patterns whose |
| 414 | * `/Matrix` PDF resolves against DEFAULT page space (not the fill-time |
| 415 | * CTM), so without this a transformed or vertically-oriented gradient |
| 416 | * paints in the wrong place / orientation. |
| 417 | * |
| 418 | * @var non-empty-list<array{float, float, float, float, float, float}> |
| 419 | */ |
| 420 | private array $matrixStack = [[1.0, 0.0, 0.0, 1.0, 0.0, 0.0]]; |
| 421 | |
| 422 | private function paintChildren(Element $parent, ContentStream $stream): void |
| 423 | { |
| 424 | foreach ($parent->children as $child) { |
| 425 | if ($child instanceof Element) { |
| 426 | $this->paintElement($child, $stream); |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * SVG 2 §7.5 — a nested `<svg>` establishes a new viewport from its |
| 433 | * `x` / `y` / `width` / `height`, clips overflow to it, and (when it |
| 434 | * carries a `viewBox`) sets up a new user coordinate system via the |
| 435 | * viewBox-to-viewport scale + `preserveAspectRatio` alignment. |
| 436 | */ |
| 437 | private function paintNestedSvg(\Phpdftk\Svg\NestedSvg $svg, ContentStream $stream): void |
| 438 | { |
| 439 | $this->paintViewportInstance($svg, $stream); |
| 440 | } |
| 441 | |
| 442 | /** |
| 443 | * Paint a viewport-establishing element — a nested `<svg>`, or the |
| 444 | * instance a `<use>` generates for a `<symbol>` (SVG 2 §5.5, |
| 445 | * §5.6.2). Both map their content into a rectangle and clip to it; |
| 446 | * the only difference is that a `<symbol>` never paints unless a |
| 447 | * `<use>` brings it here. |
| 448 | */ |
| 449 | private function paintViewportInstance(\Phpdftk\Svg\ViewportElement $svg, ContentStream $stream): void |
| 450 | { |
| 451 | // A `<use>` that references this element overrides its viewport size. |
| 452 | $override = $this->pendingUseViewport; |
| 453 | $this->pendingUseViewport = null; |
| 454 | $vp = $this->currentViewport(); |
| 455 | $x = $this->resolveViewportLength($svg->getAttribute('x'), $vp['w'], 0.0); |
| 456 | $y = $this->resolveViewportLength($svg->getAttribute('y'), $vp['h'], 0.0); |
| 457 | // Width / height: a `<use>` override wins PER AXIS; otherwise the |
| 458 | // element's own attributes, defaulting to 100% of the enclosing |
| 459 | // viewport. |
| 460 | $w = $override['w'] ?? $this->resolveViewportLength($svg->widthAttribute(), $vp['w'], $vp['w']); |
| 461 | $h = $override['h'] ?? $this->resolveViewportLength($svg->heightAttribute(), $vp['h'], $vp['h']); |
| 462 | if ($w <= 0.0 || $h <= 0.0) { |
| 463 | return; // A zero-sized viewport disables rendering (SVG 2 §7.5). |
| 464 | } |
| 465 | |
| 466 | $stream->saveGraphicsState(); |
| 467 | // Position the viewport, then clip overflow to it — SVG 2 §8.2 |
| 468 | // puts `overflow: hidden` on viewport elements in the UA |
| 469 | // stylesheet, which the author can turn off. |
| 470 | $stream->concatMatrix(1.0, 0.0, 0.0, 1.0, $x, $y); |
| 471 | if (self::viewportClips($svg)) { |
| 472 | $stream->rectangle(0.0, 0.0, $w, $h); |
| 473 | $stream->clip(); |
| 474 | $stream->endPath(); |
| 475 | } |
| 476 | |
| 477 | $childViewport = ['w' => $w, 'h' => $h]; |
| 478 | $viewBox = $svg->viewBox(); |
| 479 | if ($viewBox !== null && $viewBox[2] > 0.0 && $viewBox[3] > 0.0) { |
| 480 | [$scaleX, $scaleY, $offsetX, $offsetY] |
| 481 | = $this->nestedViewBoxTransform($svg, $viewBox[2], $viewBox[3], $w, $h); |
| 482 | $stream->concatMatrix( |
| 483 | $scaleX, |
| 484 | 0.0, |
| 485 | 0.0, |
| 486 | $scaleY, |
| 487 | $offsetX - $viewBox[0] * $scaleX, |
| 488 | $offsetY - $viewBox[1] * $scaleY, |
| 489 | ); |
| 490 | $childViewport = ['w' => $viewBox[2], 'h' => $viewBox[3]]; |
| 491 | } |
| 492 | |
| 493 | $this->viewportStack[] = $childViewport; |
| 494 | $this->paintChildren($svg, $stream); |
| 495 | array_pop($this->viewportStack); |
| 496 | $stream->restoreGraphicsState(); |
| 497 | } |
| 498 | |
| 499 | /** |
| 500 | * Whether a viewport element clips its content to the viewport. |
| 501 | * |
| 502 | * SVG 2 §8.2 — the UA stylesheet sets `overflow: hidden` on `svg`, |
| 503 | * `symbol`, `image`, `marker` and `pattern`, so the DEFAULT here is |
| 504 | * to clip even though CSS's own initial value is `visible`. Only an |
| 505 | * author `overflow: visible` turns the clip off. |
| 506 | * |
| 507 | * `auto` CLIPS. SVG 1.1 used to define it as "the content is not |
| 508 | * clipped", but w3c/svgwg#1072 settled on CSS's meaning — there is |
| 509 | * nothing to scroll in an SVG viewport, so `auto` degenerates to |
| 510 | * `hidden`. WPT's `painting/inner-outer-svg-overflow-auto` asserts |
| 511 | * exactly that, on both the inner and the outer viewport. |
| 512 | */ |
| 513 | private static function viewportClips(Element $element): bool |
| 514 | { |
| 515 | return $element->overflowValue() !== 'visible'; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Resolve a nested-viewport length attribute: a `%` resolves against |
| 520 | * the given viewport dimension, a plain number is taken as-is, and an |
| 521 | * absent/empty value falls back to `$default`. |
| 522 | */ |
| 523 | private function resolveViewportLength(?string $raw, float $viewport, float $default): float |
| 524 | { |
| 525 | if ($raw === null || trim($raw) === '') { |
| 526 | return $default; |
| 527 | } |
| 528 | if (preg_match( |
| 529 | '/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*(%|vw|vh|vmin|vmax)\s*$/i', |
| 530 | $raw, |
| 531 | $m, |
| 532 | ) === 1) { |
| 533 | return ((float) $m[1]) / 100.0 * $this->relativeLengthBasis(strtolower($m[2]), $viewport); |
| 534 | } |
| 535 | $plain = self::parseLengthPrefixForViewport($raw); |
| 536 | return $plain ?? $default; |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * Nested viewBox-to-viewport mapping in SVG user space (y-down — the |
| 541 | * outer document transform applies the PDF flip). Returns |
| 542 | * `[scaleX, scaleY, offsetX, offsetY]`. Mirrors the root |
| 543 | * `applyPreserveAspectRatio` but without the PDF y-axis inversion, |
| 544 | * since a nested `<svg>` composes inside the already-flipped space. |
| 545 | * |
| 546 | * @return array{0: float, 1: float, 2: float, 3: float} |
| 547 | */ |
| 548 | private function nestedViewBoxTransform( |
| 549 | Element $svg, |
| 550 | float $srcW, |
| 551 | float $srcH, |
| 552 | float $dstW, |
| 553 | float $dstH, |
| 554 | ): array { |
| 555 | return self::viewBoxTransform( |
| 556 | $svg->getAttribute('preserveAspectRatio') ?? '', |
| 557 | $srcW, |
| 558 | $srcH, |
| 559 | $dstW, |
| 560 | $dstH, |
| 561 | ); |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * viewBox-to-viewport mapping for a given `preserveAspectRatio` |
| 566 | * string, in SVG user space (y-down — the outer document transform |
| 567 | * applies the PDF flip). Returns `[scaleX, scaleY, offsetX, |
| 568 | * offsetY]`. |
| 569 | * |
| 570 | * @return array{0: float, 1: float, 2: float, 3: float} |
| 571 | */ |
| 572 | private static function viewBoxTransform( |
| 573 | string $preserveAspectRatio, |
| 574 | float $srcW, |
| 575 | float $srcH, |
| 576 | float $dstW, |
| 577 | float $dstH, |
| 578 | ): array { |
| 579 | $sx = $srcW > 0.0 ? $dstW / $srcW : 1.0; |
| 580 | $sy = $srcH > 0.0 ? $dstH / $srcH : 1.0; |
| 581 | $par = strtolower(trim($preserveAspectRatio)); |
| 582 | if ($par === 'none') { |
| 583 | return [$sx, $sy, 0.0, 0.0]; |
| 584 | } |
| 585 | $tokens = preg_split('/\s+/', $par) ?: []; |
| 586 | $align = $tokens[0] ?? ''; |
| 587 | $slice = ($tokens[1] ?? 'meet') === 'slice'; |
| 588 | $scale = $slice ? max($sx, $sy) : min($sx, $sy); |
| 589 | [$xRatio, $yRatio] = self::nestedAlignRatios($align); |
| 590 | return [ |
| 591 | $scale, |
| 592 | $scale, |
| 593 | $xRatio * ($dstW - $scale * $srcW), |
| 594 | $yRatio * ($dstH - $scale * $srcH), |
| 595 | ]; |
| 596 | } |
| 597 | |
| 598 | /** |
| 599 | * The affine matrix for an element's `transform`, pivoted about its |
| 600 | * `transform-origin` (CSS Transforms 1 §6). |
| 601 | * |
| 602 | * SVG elements have no associated CSS layout box, so the initial |
| 603 | * `transform-origin` is `0 0` — the plain `transform` matrix — and |
| 604 | * only an explicit value costs a bounding-box computation. |
| 605 | * |
| 606 | * @return array{float, float, float, float, float, float} |
| 607 | */ |
| 608 | private function transformMatrixFor(Element $element, Transform $transform): array |
| 609 | { |
| 610 | $raw = $element->transformOrigin(); |
| 611 | $boxKeyword = $element->transformBox(); |
| 612 | if ($raw === null && $boxKeyword === null) { |
| 613 | return $transform->toMatrix(); |
| 614 | } |
| 615 | $box = $this->referenceBox($element, $boxKeyword); |
| 616 | if ($box === null) { |
| 617 | return $transform->toMatrix(); |
| 618 | } |
| 619 | if ($raw === null) { |
| 620 | // An explicit `transform-box` with no `transform-origin` |
| 621 | // pivots on the reference box's own origin: SVG elements |
| 622 | // have no CSS layout box, so their used initial |
| 623 | // `transform-origin` is `0 0` rather than `50% 50%`. |
| 624 | return $transform->toMatrixAbout($box[0], $box[1]); |
| 625 | } |
| 626 | $origin = TransformOrigin::parse($raw); |
| 627 | if ($origin === null) { |
| 628 | return $boxKeyword === null |
| 629 | ? $transform->toMatrix() |
| 630 | : $transform->toMatrixAbout($box[0], $box[1]); |
| 631 | } |
| 632 | [$ox, $oy] = $origin->resolve( |
| 633 | $box[0], |
| 634 | $box[1], |
| 635 | $box[2], |
| 636 | $box[3], |
| 637 | ); |
| 638 | return $transform->toMatrixAbout($ox, $oy); |
| 639 | } |
| 640 | |
| 641 | /** |
| 642 | * The reference box `transform-origin` resolves against |
| 643 | * (CSS Transforms 1 §7), as `[x, y, width, height]` in user units. |
| 644 | * |
| 645 | * `view-box` is the nearest SVG viewport; `fill-box` is the object |
| 646 | * bounding box; `stroke-box` is that box grown by half the stroke |
| 647 | * on each side. For SVG elements — which have no CSS layout box — |
| 648 | * `content-box` behaves as `fill-box` and `border-box` as |
| 649 | * `stroke-box`. |
| 650 | * |
| 651 | * A null `$keyword` means no `transform-box` was specified, which |
| 652 | * takes the initial value, `view-box`. |
| 653 | * |
| 654 | * @return array{float, float, float, float}|null |
| 655 | */ |
| 656 | private function referenceBox(Element $element, ?string $keyword): ?array |
| 657 | { |
| 658 | if ($keyword === null || $keyword === 'view-box') { |
| 659 | $viewport = $this->currentViewport(); |
| 660 | return [0.0, 0.0, $viewport['w'], $viewport['h']]; |
| 661 | } |
| 662 | $bbox = BoundingBox::compute($element, viewport: $this->currentViewport()); |
| 663 | if ($bbox === null) { |
| 664 | return null; |
| 665 | } |
| 666 | $box = [$bbox['minX'], $bbox['minY'], $bbox['width'], $bbox['height']]; |
| 667 | if ($keyword === 'stroke-box' || $keyword === 'border-box') { |
| 668 | $half = ($element->strokeWidth() ?? 1.0) / 2.0; |
| 669 | $box = [ |
| 670 | $box[0] - $half, |
| 671 | $box[1] - $half, |
| 672 | $box[2] + $half * 2.0, |
| 673 | $box[3] + $half * 2.0, |
| 674 | ]; |
| 675 | } |
| 676 | return $box; |
| 677 | } |
| 678 | |
| 679 | /** |
| 680 | * `preserveAspectRatio` align keyword → `[xRatio, yRatio]` leftover |
| 681 | * fractions, in SVG y-down space (`yMin` → 0, `yMid` → 0.5, |
| 682 | * `yMax` → 1). Defaults to `xMidYMid`. |
| 683 | * |
| 684 | * @return array{0: float, 1: float} |
| 685 | */ |
| 686 | private static function nestedAlignRatios(string $align): array |
| 687 | { |
| 688 | $align = $align === '' ? 'xmidymid' : $align; |
| 689 | $xRatio = str_contains($align, 'xmax') ? 1.0 : (str_contains($align, 'xmin') ? 0.0 : 0.5); |
| 690 | $yRatio = str_contains($align, 'ymax') ? 1.0 : (str_contains($align, 'ymin') ? 0.0 : 0.5); |
| 691 | return [$xRatio, $yRatio]; |
| 692 | } |
| 693 | |
| 694 | private function paintElement(Element $element, ContentStream $stream): void |
| 695 | { |
| 696 | // SVG 2 §8.9 — `display: none` removes the element AND its |
| 697 | // descendants from the rendering tree. Unlike `visibility`, a |
| 698 | // descendant cannot opt back in, so this is a hard return |
| 699 | // rather than a paint-time flag. |
| 700 | if ($element->displayValue() === 'none') { |
| 701 | return; |
| 702 | } |
| 703 | // SVG 2 §5.8 — conditional processing gates EVERY direct |
| 704 | // rendering element, not only `<switch>` branches. An element |
| 705 | // whose conditions evaluate false is not rendered, and neither |
| 706 | // are its children. |
| 707 | if (!$this->switchChildPasses($element)) { |
| 708 | return; |
| 709 | } |
| 710 | // Any of these scope-leaking attributes triggers a `q`/`Q` wrap |
| 711 | // so the state doesn't leak across siblings: |
| 712 | // |
| 713 | // - transform: emits `cm`. |
| 714 | // - opacity / fill-opacity / stroke-opacity (< 1): emits `gs`. |
| 715 | // - stroke params (w / J / j / M / d): each emits its own op. |
| 716 | // - clip-path: emits the clip region inside the same wrap. |
| 717 | // - mask: emits `gs` referencing a SMask-bearing ExtGState. |
| 718 | // |
| 719 | // Painting the same shape with all defaults stays a one-shot |
| 720 | // op stream — no overhead when none of the above is set. |
| 721 | $transform = $element->transform(); |
| 722 | $opacityGs = $this->resolveOpacityState($element); |
| 723 | $needsStrokeParams = $this->needsStrokeParams($element); |
| 724 | $clipPath = $this->resolveClipPath($element); |
| 725 | $shapeClip = $clipPath === null ? $this->resolveShapeClipPath($element) : null; |
| 726 | $maskGs = $this->resolveMaskState($element); |
| 727 | $needsWrap = $transform !== null |
| 728 | || $opacityGs !== null |
| 729 | || $needsStrokeParams |
| 730 | || $clipPath !== null |
| 731 | || $shapeClip !== null |
| 732 | || $maskGs !== null; |
| 733 | |
| 734 | if (!$needsWrap) { |
| 735 | $this->dispatchElement($element, $stream); |
| 736 | return; |
| 737 | } |
| 738 | |
| 739 | $stream->saveGraphicsState(); |
| 740 | if ($transform !== null) { |
| 741 | $matrix = $this->transformMatrixFor($element, $transform); |
| 742 | $stream->concatMatrix( |
| 743 | $matrix[0], |
| 744 | $matrix[1], |
| 745 | $matrix[2], |
| 746 | $matrix[3], |
| 747 | $matrix[4], |
| 748 | $matrix[5], |
| 749 | ); |
| 750 | // Track the transform so gradient fills inside this element (and |
| 751 | // its children) anchor their pattern to the same CTM the geometry |
| 752 | // is painted under. |
| 753 | $this->pushMatrix($matrix); |
| 754 | } |
| 755 | if ($opacityGs !== null) { |
| 756 | $stream->setGraphicsState($opacityGs); |
| 757 | } |
| 758 | if ($needsStrokeParams) { |
| 759 | $this->applyStrokeParams($element, $stream); |
| 760 | } |
| 761 | if ($clipPath !== null) { |
| 762 | $this->applyClipPath($clipPath, $element, $stream); |
| 763 | } |
| 764 | if ($shapeClip !== null) { |
| 765 | self::emitShapeClip($shapeClip, $stream); |
| 766 | } |
| 767 | if ($maskGs !== null) { |
| 768 | $stream->setGraphicsState($maskGs); |
| 769 | } |
| 770 | $this->dispatchElement($element, $stream); |
| 771 | if ($transform !== null) { |
| 772 | $this->popMatrix(); |
| 773 | } |
| 774 | $stream->restoreGraphicsState(); |
| 775 | } |
| 776 | |
| 777 | /** |
| 778 | * Resolve `mask="url(#id)"` to a registered `ExtGState` whose |
| 779 | * `/SMask` references a Form XObject containing the mask's |
| 780 | * painted children. Returns the resource name to invoke via |
| 781 | * `gs`, or null when no mask is set / can't be resolved. |
| 782 | * |
| 783 | * Pipeline: |
| 784 | * |
| 785 | * 1. Paint the `<mask>`'s children into a new `ContentStream` |
| 786 | * (running the full Translator pipeline so gradients, fonts, |
| 787 | * images, etc. all register on the host page). |
| 788 | * 2. Wrap the resulting bytes in a Form XObject. `/Group /S |
| 789 | * Transparency /CS DeviceGray` so the form's pixels become an |
| 790 | * alpha channel via their luminance. |
| 791 | * 3. Build a `SoftMask` dict with `/S Luminosity` and `/BC [0]` |
| 792 | * so the backdrop outside the mask region is black (hidden). |
| 793 | * 4. Drop the SMask in an `ExtGState`, register, and attach to |
| 794 | * the page's resources under a stable name. |
| 795 | * |
| 796 | * Implemented: |
| 797 | * |
| 798 | * - `maskContentUnits = objectBoundingBox` applies a bbox `cm` |
| 799 | * to the mask content stream so authored coords are in [0, 1]. |
| 800 | * - SVG 2 §14.5.4 defaults are honoured: bbox-mode defaults |
| 801 | * `(-10%, -10%, 120%, 120%)` so the mask reaches a hair |
| 802 | * beyond the painted geometry; userspace-mode defaults to |
| 803 | * the masked element's own bbox. |
| 804 | * - Explicit `x` / `y` / `width` / `height` attributes on |
| 805 | * the `<mask>` element override the defaults. |
| 806 | */ |
| 807 | private function resolveMaskState(Element $element): ?string |
| 808 | { |
| 809 | if ($this->writer === null |
| 810 | || $this->page === null |
| 811 | || $this->document === null |
| 812 | ) { |
| 813 | return null; |
| 814 | } |
| 815 | $raw = $element->maskValue(); |
| 816 | if ($raw === null) { |
| 817 | return null; |
| 818 | } |
| 819 | $trimmed = trim($raw); |
| 820 | if ($trimmed === 'none') { |
| 821 | return null; |
| 822 | } |
| 823 | if (preg_match('/^url\(\s*[\x22\x27]?#([^)\s\x22\x27]+)[\x22\x27]?\s*\)/i', $trimmed, $m) !== 1) { |
| 824 | return null; |
| 825 | } |
| 826 | $referent = $this->document->findByFragment($m[1]); |
| 827 | if (!$referent instanceof Mask) { |
| 828 | return null; |
| 829 | } |
| 830 | $elementBbox = BoundingBox::compute($element, viewport: $this->currentViewport()); |
| 831 | if ($elementBbox === null) { |
| 832 | return null; |
| 833 | } |
| 834 | return $this->buildMaskState($referent, $elementBbox, null, null); |
| 835 | } |
| 836 | |
| 837 | /** |
| 838 | * CSS Masking 1 §4 — build the soft-mask `ExtGState` for a `<mask>` |
| 839 | * element referenced from OUTSIDE the SVG pipeline (an HTML element's |
| 840 | * `mask-image: url(#id)`), and return its resource name. |
| 841 | * |
| 842 | * `$elementBbox` is the masked element's bounding box in the mask's |
| 843 | * own user space — for an HTML element that space has its origin at |
| 844 | * the top-left of the border box with y running down, so the bbox is |
| 845 | * `(0, 0, w, h)`. `$baseMatrix` maps that space onto the page and is |
| 846 | * prepended to the mask's content stream (the soft mask is evaluated |
| 847 | * under the CTM in force when its `gs` runs, and the HTML painter |
| 848 | * paints under the identity CTM). `$subtypeOverride` carries CSS |
| 849 | * `mask-mode`, which wins over the element's `mask-type`. |
| 850 | * |
| 851 | * @param array{minX: float, minY: float, width: float, height: float} $elementBbox |
| 852 | * @param array{float, float, float, float, float, float}|null $baseMatrix |
| 853 | */ |
| 854 | public function registerMaskState( |
| 855 | SvgDocument $document, |
| 856 | Mask $mask, |
| 857 | Page $page, |
| 858 | PdfWriter $writer, |
| 859 | array $elementBbox, |
| 860 | ?array $baseMatrix = null, |
| 861 | ?string $subtypeOverride = null, |
| 862 | ): ?string { |
| 863 | $previous = [$this->document, $this->page, $this->writer, $this->gradientPainter, $this->fontResolver, $this->matrixStack]; |
| 864 | $this->document = $document; |
| 865 | $this->page = $page; |
| 866 | $this->writer = $writer; |
| 867 | $this->gradientPainter = new GradientPainter($writer, $page, $document); |
| 868 | $this->fontResolver = new FontResolver($writer, $page); |
| 869 | $this->matrixStack = [$baseMatrix ?? [1.0, 0.0, 0.0, 1.0, 0.0, 0.0]]; |
| 870 | try { |
| 871 | return $this->buildMaskState($mask, $elementBbox, $baseMatrix, $subtypeOverride); |
| 872 | } finally { |
| 873 | [$this->document, $this->page, $this->writer, $this->gradientPainter, $this->fontResolver, $this->matrixStack] = $previous; |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | /** |
| 878 | * Shared body of {@see resolveMaskState} / {@see registerMaskState}. |
| 879 | * |
| 880 | * @param array{minX: float, minY: float, width: float, height: float} $elementBbox |
| 881 | * @param array{float, float, float, float, float, float}|null $baseMatrix |
| 882 | */ |
| 883 | private function buildMaskState( |
| 884 | Mask $referent, |
| 885 | array $elementBbox, |
| 886 | ?array $baseMatrix, |
| 887 | ?string $subtypeOverride, |
| 888 | ): ?string { |
| 889 | if ($this->writer === null || $this->page === null) { |
| 890 | return null; |
| 891 | } |
| 892 | $region = self::computeMaskRegion($referent, $elementBbox); |
| 893 | |
| 894 | $maskStream = new ContentStream(); |
| 895 | if ($baseMatrix !== null) { |
| 896 | $maskStream->concatMatrix(...$baseMatrix); |
| 897 | } |
| 898 | if ($referent->maskContentUnits() === 'objectBoundingBox') { |
| 899 | // Reify mask children's [0, 1] coords against the masked |
| 900 | // element's bbox (the same reference frame the masked |
| 901 | // element's geometry inhabits — not the mask region). |
| 902 | $maskStream->concatMatrix( |
| 903 | $elementBbox['width'], |
| 904 | 0.0, |
| 905 | 0.0, |
| 906 | $elementBbox['height'], |
| 907 | $elementBbox['minX'], |
| 908 | $elementBbox['minY'], |
| 909 | ); |
| 910 | } |
| 911 | foreach ($referent->children as $child) { |
| 912 | if ($child instanceof Element) { |
| 913 | $this->paintElement($child, $maskStream); |
| 914 | } |
| 915 | } |
| 916 | $operatorBytes = implode("\n", $maskStream->getOperators()); |
| 917 | // The BBox lives in the form's OWN space, i.e. before the content |
| 918 | // stream's own `cm`. Map the user-space region through the base |
| 919 | // matrix so an externally-supplied mapping is accounted for. |
| 920 | $corners = [ |
| 921 | [$region['minX'], $region['minY']], |
| 922 | [$region['minX'] + $region['width'], $region['minY'] + $region['height']], |
| 923 | ]; |
| 924 | if ($baseMatrix !== null) { |
| 925 | [$a, $b, $c, $d, $e, $f] = $baseMatrix; |
| 926 | foreach ($corners as $i => [$cx, $cy]) { |
| 927 | $corners[$i] = [$a * $cx + $c * $cy + $e, $b * $cx + $d * $cy + $f]; |
| 928 | } |
| 929 | } |
| 930 | $form = new FormXObject( |
| 931 | new PdfArray([ |
| 932 | new PdfNumber(min($corners[0][0], $corners[1][0])), |
| 933 | new PdfNumber(min($corners[0][1], $corners[1][1])), |
| 934 | new PdfNumber(max($corners[0][0], $corners[1][0])), |
| 935 | new PdfNumber(max($corners[0][1], $corners[1][1])), |
| 936 | ]), |
| 937 | $operatorBytes, |
| 938 | ); |
| 939 | // Transparency group with the DeviceGray colour space so the |
| 940 | // luminance of the painted pixels becomes the mask's alpha. |
| 941 | $group = new GroupAttributes('Transparency'); |
| 942 | $group->cs = new PdfName('DeviceGray'); |
| 943 | $form->group = $group; |
| 944 | $this->writer->register($form); |
| 945 | |
| 946 | // SVG 2 §14.5: `mask-type="alpha"` uses the painted pixels' |
| 947 | // alpha channel directly; the default `luminance` (also |
| 948 | // covering the old `mask-type` absent case) uses the |
| 949 | // luminance of the RGB pixels. PDF maps these to the SoftMask |
| 950 | // `/S /Alpha` and `/S /Luminosity` modes. |
| 951 | $maskSubtype = strtolower(trim($referent->getAttribute('mask-type') ?? '')); |
| 952 | $smask = new SoftMask( |
| 953 | $subtypeOverride ?? ($maskSubtype === 'alpha' ? 'Alpha' : 'Luminosity'), |
| 954 | new PdfReference($form->objectNumber), |
| 955 | ); |
| 956 | // Backdrop colour black ([0]) so anywhere the mask content |
| 957 | // doesn't paint stays hidden — matches SVG 2's "outside the |
| 958 | // mask region the alpha is 0" semantic. |
| 959 | $smask->bc = new PdfArray([new PdfNumber(0)]); |
| 960 | |
| 961 | $gstate = new ExtGState(); |
| 962 | $gstate->sMask = $smask; |
| 963 | $this->writer->register($gstate); |
| 964 | |
| 965 | $name = 'GS_mask_' . $gstate->objectNumber; |
| 966 | $resources = $this->page->corePage()->resources; |
| 967 | if ($resources !== null) { |
| 968 | $resources->extGState[$name] = new PdfReference($gstate->objectNumber); |
| 969 | } |
| 970 | return $name; |
| 971 | } |
| 972 | |
| 973 | /** |
| 974 | * Compute the rectangular region that the mask covers, in user |
| 975 | * space. SVG 2 §14.5.4 defaults: |
| 976 | * |
| 977 | * - `maskUnits="objectBoundingBox"` (default): `x=-10%, y=-10%, |
| 978 | * width=120%, height=120%` of the masked element's bounding |
| 979 | * box. The 10% pad on each side is what makes the mask |
| 980 | * naturally reach a hair beyond the painted geometry so |
| 981 | * anti-aliased edges aren't clipped. |
| 982 | * - `maskUnits="userSpaceOnUse"`: SVG defaults to the viewport |
| 983 | * rect (-10% etc. of the viewport), which we don't have direct |
| 984 | * access to here — fall back to the masked element's bbox |
| 985 | * (matches 3R+8 behaviour for unset attributes). |
| 986 | * |
| 987 | * @param array{minX: float, minY: float, width: float, height: float} $elementBbox |
| 988 | * @return array{minX: float, minY: float, width: float, height: float} |
| 989 | */ |
| 990 | private static function computeMaskRegion(Mask $mask, array $elementBbox): array |
| 991 | { |
| 992 | $bboxMode = $mask->maskUnits() === 'objectBoundingBox'; |
| 993 | |
| 994 | if ($bboxMode) { |
| 995 | $x = $mask->x() ?? -0.1; |
| 996 | $y = $mask->y() ?? -0.1; |
| 997 | $w = $mask->width() ?? 1.2; |
| 998 | $h = $mask->height() ?? 1.2; |
| 999 | return [ |
| 1000 | 'minX' => $elementBbox['minX'] + $x * $elementBbox['width'], |
| 1001 | 'minY' => $elementBbox['minY'] + $y * $elementBbox['height'], |
| 1002 | 'width' => $w * $elementBbox['width'], |
| 1003 | 'height' => $h * $elementBbox['height'], |
| 1004 | ]; |
| 1005 | } |
| 1006 | |
| 1007 | return [ |
| 1008 | 'minX' => $mask->x() ?? $elementBbox['minX'], |
| 1009 | 'minY' => $mask->y() ?? $elementBbox['minY'], |
| 1010 | 'width' => $mask->width() ?? $elementBbox['width'], |
| 1011 | 'height' => $mask->height() ?? $elementBbox['height'], |
| 1012 | ]; |
| 1013 | } |
| 1014 | |
| 1015 | /** |
| 1016 | * CSS Masking 1 §6 — `clip-path: <basic-shape> || <geometry-box>` on |
| 1017 | * an SVG graphics element. Returns the resolved outline (in the |
| 1018 | * element's user space, y down) or null when the element has no such |
| 1019 | * clip-path, the shape is one we don't model, or the reference box |
| 1020 | * can't be computed. |
| 1021 | * |
| 1022 | * @return array{fillRule: 'nonzero'|'evenodd', commands: list<list<string|float>>}|null |
| 1023 | */ |
| 1024 | private function resolveShapeClipPath(Element $element): ?array |
| 1025 | { |
| 1026 | $raw = $element->clipPathValue(); |
| 1027 | if ($raw === null) { |
| 1028 | return null; |
| 1029 | } |
| 1030 | $trimmed = trim($raw); |
| 1031 | if ($trimmed === '' || $trimmed === 'none' || str_starts_with(strtolower($trimmed), 'url(')) { |
| 1032 | return null; |
| 1033 | } |
| 1034 | try { |
| 1035 | $value = (new ValueParser())->parseFromString($trimmed); |
| 1036 | } catch (\Throwable) { |
| 1037 | return null; |
| 1038 | } |
| 1039 | // `<basic-shape> || <geometry-box>` parses as a ValueList in either |
| 1040 | // order; a bare shape parses as itself. A bare `<geometry-box>` |
| 1041 | // clips to that box's edge. |
| 1042 | $shape = null; |
| 1043 | $refBox = 'border-box'; |
| 1044 | $geometryBoxes = [ |
| 1045 | 'content-box', 'padding-box', 'border-box', 'margin-box', |
| 1046 | 'fill-box', 'stroke-box', 'view-box', |
| 1047 | ]; |
| 1048 | if ($value instanceof ValueList) { |
| 1049 | foreach ($value->values as $part) { |
| 1050 | if ($part instanceof BasicShape) { |
| 1051 | $shape = $part; |
| 1052 | } elseif ($part instanceof CssKeyword |
| 1053 | && in_array(strtolower($part->name), $geometryBoxes, true) |
| 1054 | ) { |
| 1055 | $refBox = strtolower($part->name); |
| 1056 | } |
| 1057 | } |
| 1058 | if ($shape === null) { |
| 1059 | return null; |
| 1060 | } |
| 1061 | } elseif ($value instanceof BasicShape) { |
| 1062 | $shape = $value; |
| 1063 | } elseif ($value instanceof CssKeyword |
| 1064 | && in_array(strtolower($value->name), $geometryBoxes, true) |
| 1065 | ) { |
| 1066 | $refBox = strtolower($value->name); |
| 1067 | } else { |
| 1068 | // Not a shape, not a geometry box — an unparseable or unknown |
| 1069 | // value. CSS Masking 1 §6.1 leaves the element unclipped. |
| 1070 | return null; |
| 1071 | } |
| 1072 | $box = $this->clipReferenceBox($element, $refBox); |
| 1073 | if ($box === null || $box['width'] <= 0.0 || $box['height'] <= 0.0) { |
| 1074 | return null; |
| 1075 | } |
| 1076 | if ($shape === null) { |
| 1077 | // Bare `<geometry-box>`: the box's own edge is the clip. |
| 1078 | return [ |
| 1079 | 'fillRule' => 'nonzero', |
| 1080 | 'commands' => [ |
| 1081 | ['M', $box['minX'], $box['minY']], |
| 1082 | ['L', $box['minX'] + $box['width'], $box['minY']], |
| 1083 | ['L', $box['minX'] + $box['width'], $box['minY'] + $box['height']], |
| 1084 | ['L', $box['minX'], $box['minY'] + $box['height']], |
| 1085 | ['Z'], |
| 1086 | ], |
| 1087 | ]; |
| 1088 | } |
| 1089 | return BasicShapePath::build( |
| 1090 | $shape, |
| 1091 | $box['minX'], |
| 1092 | $box['minY'], |
| 1093 | $box['width'], |
| 1094 | $box['height'], |
| 1095 | ); |
| 1096 | } |
| 1097 | |
| 1098 | /** |
| 1099 | * CSS Masking 1 §6 / CSS Box 3 — the `<geometry-box>` an SVG element's |
| 1100 | * basic shape is measured against, in the element's user space. |
| 1101 | * |
| 1102 | * An SVG graphics element has no CSS layout box, so `content-box`, |
| 1103 | * `padding-box`, `border-box` and `margin-box` all reduce to |
| 1104 | * `fill-box` — its object bounding box. `stroke-box` grows that by |
| 1105 | * half the stroke width on every side, and `view-box` is the nearest |
| 1106 | * SVG viewport, anchored at the user-space origin. |
| 1107 | * |
| 1108 | * @return array{minX: float, minY: float, width: float, height: float}|null |
| 1109 | */ |
| 1110 | private function clipReferenceBox(Element $element, string $refBox): ?array |
| 1111 | { |
| 1112 | if ($refBox === 'view-box') { |
| 1113 | $viewport = $this->currentViewport(); |
| 1114 | if ($viewport['w'] <= 0.0 || $viewport['h'] <= 0.0) { |
| 1115 | return null; |
| 1116 | } |
| 1117 | return [ |
| 1118 | 'minX' => 0.0, |
| 1119 | 'minY' => 0.0, |
| 1120 | 'width' => $viewport['w'], |
| 1121 | 'height' => $viewport['h'], |
| 1122 | ]; |
| 1123 | } |
| 1124 | return BoundingBox::compute( |
| 1125 | $element, |
| 1126 | includeStroke: $refBox === 'stroke-box', |
| 1127 | viewport: $this->currentViewport(), |
| 1128 | ); |
| 1129 | } |
| 1130 | |
| 1131 | /** |
| 1132 | * Emit a resolved basic-shape outline as a PDF clipping path. The |
| 1133 | * commands are already in the element's user space, which is the space |
| 1134 | * the stream is painting in, so they go through verbatim. |
| 1135 | * |
| 1136 | * @param array{fillRule: 'nonzero'|'evenodd', commands: list<list<string|float>>} $outline |
| 1137 | */ |
| 1138 | private static function emitShapeClip(array $outline, ContentStream $stream): void |
| 1139 | { |
| 1140 | foreach ($outline['commands'] as $command) { |
| 1141 | switch ($command[0]) { |
| 1142 | case 'M': |
| 1143 | $stream->moveTo((float) $command[1], (float) $command[2]); |
| 1144 | break; |
| 1145 | case 'L': |
| 1146 | $stream->lineTo((float) $command[1], (float) $command[2]); |
| 1147 | break; |
| 1148 | case 'C': |
| 1149 | $stream->curveTo( |
| 1150 | (float) $command[1], |
| 1151 | (float) $command[2], |
| 1152 | (float) $command[3], |
| 1153 | (float) $command[4], |
| 1154 | (float) $command[5], |
| 1155 | (float) $command[6], |
| 1156 | ); |
| 1157 | break; |
| 1158 | default: |
| 1159 | $stream->closePath(); |
| 1160 | break; |
| 1161 | } |
| 1162 | } |
| 1163 | if ($outline['fillRule'] === 'evenodd') { |
| 1164 | $stream->clipEvenOdd(); |
| 1165 | } else { |
| 1166 | $stream->clip(); |
| 1167 | } |
| 1168 | $stream->endPath(); |
| 1169 | } |
| 1170 | |
| 1171 | /** |
| 1172 | * Resolve an element's `clip-path="url(#id)"` reference to the |
| 1173 | * matching `<clipPath>` element. Returns null when no clip-path is |
| 1174 | * set, the reference can't be parsed, or the id doesn't resolve to |
| 1175 | * a clipPath — each case falls through to the unclipped paint per |
| 1176 | * SVG 2's "invalid → no clip" rule. |
| 1177 | */ |
| 1178 | private function resolveClipPath(Element $element): ?ClipPath |
| 1179 | { |
| 1180 | if ($this->document === null) { |
| 1181 | return null; |
| 1182 | } |
| 1183 | $raw = $element->clipPathValue(); |
| 1184 | if ($raw === null) { |
| 1185 | return null; |
| 1186 | } |
| 1187 | $trimmed = trim($raw); |
| 1188 | if ($trimmed === 'none') { |
| 1189 | return null; |
| 1190 | } |
| 1191 | if (preg_match('/^url\(\s*[\x22\x27]?#([^)\s\x22\x27]+)[\x22\x27]?\s*\)/i', $trimmed, $m) !== 1) { |
| 1192 | return null; |
| 1193 | } |
| 1194 | $referent = $this->document->findByFragment($m[1]); |
| 1195 | return $referent instanceof ClipPath ? $referent : null; |
| 1196 | } |
| 1197 | |
| 1198 | /** |
| 1199 | * Construct the PDF clipping region from the `<clipPath>` element's |
| 1200 | * geometry and emit `W`/`W*` + `n` so subsequent painting is |
| 1201 | * scoped to it. `clipPathUnits="objectBoundingBox"` is honoured by |
| 1202 | * sandwiching the path construction between a bbox-space `cm` and |
| 1203 | * its inverse — the clip region is "frozen" by `W` in user space, |
| 1204 | * so applying the inverse `cm` returns the CTM to its pre-clip |
| 1205 | * state without disturbing the established region. |
| 1206 | */ |
| 1207 | private function applyClipPath(ClipPath $clipPath, Element $element, ContentStream $stream): void |
| 1208 | { |
| 1209 | $useBbox = $clipPath->clipPathUnits() === 'objectBoundingBox'; |
| 1210 | $bbox = $useBbox |
| 1211 | ? BoundingBox::compute($element, viewport: $this->currentViewport()) |
| 1212 | : null; |
| 1213 | if ($useBbox && $bbox === null) { |
| 1214 | // bbox required for objectBoundingBox mode but unavailable |
| 1215 | // (e.g. `<path>` element with no bbox helper at 3R+3) — |
| 1216 | // fall back to no clip rather than emitting a broken clip. |
| 1217 | return; |
| 1218 | } |
| 1219 | |
| 1220 | $this->emitClipRegion( |
| 1221 | $clipPath, |
| 1222 | $stream, |
| 1223 | $bbox === null |
| 1224 | ? null |
| 1225 | : [$bbox['width'], 0.0, 0.0, $bbox['height'], $bbox['minX'], $bbox['minY']], |
| 1226 | ); |
| 1227 | } |
| 1228 | |
| 1229 | /** |
| 1230 | * CSS Masking 1 §6.1 — emit the clipping region a `<clipPath>` |
| 1231 | * describes into `$stream` for a caller OUTSIDE the SVG pipeline |
| 1232 | * (the HTML painter's `clip-path: url(#id)`). |
| 1233 | * |
| 1234 | * The caller owns the coordinate system and the surrounding |
| 1235 | * `q` / `Q`: it must already have concatenated the matrix that maps |
| 1236 | * the clipPath's user space onto the page. On return the CTM is |
| 1237 | * unchanged and the clip region is established, so the caller can |
| 1238 | * keep painting in its own space. |
| 1239 | * |
| 1240 | * `$objectBoundingBox` is the referencing element's bounding box |
| 1241 | * `[x, y, width, height]` **in that user space**, used only when the |
| 1242 | * clipPath declares `clipPathUnits="objectBoundingBox"`; pass null |
| 1243 | * to force `userSpaceOnUse`. `$viewport` resolves percentage lengths |
| 1244 | * on the clipPath's children (SVG 2 §10.3) — for an HTML element |
| 1245 | * that is the initial viewport, not any SVG viewport. |
| 1246 | * |
| 1247 | * @param array{w: float, h: float} $viewport |
| 1248 | * @param array{0: float, 1: float, 2: float, 3: float}|null $objectBoundingBox |
| 1249 | */ |
| 1250 | public function emitClipPathRegion( |
| 1251 | SvgDocument $document, |
| 1252 | ClipPath $clipPath, |
| 1253 | ContentStream $stream, |
| 1254 | array $viewport, |
| 1255 | ?array $objectBoundingBox = null, |
| 1256 | ): void { |
| 1257 | $useBbox = $clipPath->clipPathUnits() === 'objectBoundingBox'; |
| 1258 | if ($useBbox && $objectBoundingBox === null) { |
| 1259 | return; |
| 1260 | } |
| 1261 | $previousDocument = $this->document; |
| 1262 | $this->document = $document; |
| 1263 | $this->viewportStack[] = $viewport; |
| 1264 | try { |
| 1265 | $this->emitClipRegion( |
| 1266 | $clipPath, |
| 1267 | $stream, |
| 1268 | $useBbox && $objectBoundingBox !== null |
| 1269 | ? [ |
| 1270 | $objectBoundingBox[2], |
| 1271 | 0.0, |
| 1272 | 0.0, |
| 1273 | $objectBoundingBox[3], |
| 1274 | $objectBoundingBox[0], |
| 1275 | $objectBoundingBox[1], |
| 1276 | ] |
| 1277 | : null, |
| 1278 | ); |
| 1279 | } finally { |
| 1280 | array_pop($this->viewportStack); |
| 1281 | $this->document = $previousDocument; |
| 1282 | } |
| 1283 | } |
| 1284 | |
| 1285 | /** |
| 1286 | * Shared body of {@see applyClipPath} / {@see emitClipPathRegion}: |
| 1287 | * build the clipPath children's geometry under `$bboxMatrix` (the |
| 1288 | * `objectBoundingBox` reification, null for `userSpaceOnUse`) plus |
| 1289 | * the clipPath's own `transform`, then freeze it with `W`/`W*` + `n`. |
| 1290 | * |
| 1291 | * @param array{float, float, float, float, float, float}|null $bboxMatrix |
| 1292 | */ |
| 1293 | private function emitClipRegion( |
| 1294 | ClipPath $clipPath, |
| 1295 | ContentStream $stream, |
| 1296 | ?array $bboxMatrix, |
| 1297 | ): void { |
| 1298 | // CSS Masking 1 §6.1 / SVG 2 §14.4 — `clip-path` ON the |
| 1299 | // `<clipPath>` element itself further restricts the region it |
| 1300 | // describes: the effective clip is the INTERSECTION of this |
| 1301 | // clipPath's child geometry with the region its own reference |
| 1302 | // describes. PDF clipping is already intersective (successive |
| 1303 | // `W`/`n` pairs narrow the region), so emitting the referenced |
| 1304 | // region first and this clipPath's geometry second composes |
| 1305 | // correctly without any explicit path intersection. |
| 1306 | // |
| 1307 | // The nested region is emitted BEFORE this clipPath's bbox / |
| 1308 | // transform `cm`s, so it resolves in the user space of the |
| 1309 | // element that referenced us — which is where a nested |
| 1310 | // clipPath's own coordinates live. `$bboxMatrix` is threaded |
| 1311 | // through unchanged so an `objectBoundingBox` nested clipPath |
| 1312 | // reifies against the same referencing element's bbox. |
| 1313 | // |
| 1314 | // `$clipPathStack` breaks reference cycles (a clipPath that |
| 1315 | // reaches itself); per SVG 2's "invalid → no clip" rule the |
| 1316 | // self-reference is dropped rather than failing the element. |
| 1317 | $nested = $this->resolveClipPath($clipPath); |
| 1318 | if ($nested !== null && $nested !== $clipPath && !in_array($nested, $this->clipPathStack, true)) { |
| 1319 | $this->clipPathStack[] = $clipPath; |
| 1320 | try { |
| 1321 | $this->emitClipRegion($nested, $stream, $bboxMatrix); |
| 1322 | } finally { |
| 1323 | array_pop($this->clipPathStack); |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | $clipTransform = $clipPath->transform()?->toMatrix(); |
| 1328 | |
| 1329 | // Apply outer→inner: bbox first, then the clipPath's own |
| 1330 | // `transform`. Children paint in their authored coordinate |
| 1331 | // system; the cm composition reifies that into user space |
| 1332 | // for the W operator to capture. |
| 1333 | if ($bboxMatrix !== null) { |
| 1334 | $stream->concatMatrix(...$bboxMatrix); |
| 1335 | } |
| 1336 | if ($clipTransform !== null) { |
| 1337 | $stream->concatMatrix(...$clipTransform); |
| 1338 | } |
| 1339 | $before = count($stream->getOperators()); |
| 1340 | foreach ($clipPath->children as $child) { |
| 1341 | if ($child instanceof Element) { |
| 1342 | $this->emitElementPath($child, $stream); |
| 1343 | } |
| 1344 | } |
| 1345 | if (count($stream->getOperators()) === $before) { |
| 1346 | // SVG 2 §14.4.1 / CSS Masking 1 §6.1 — a `<clipPath>` whose |
| 1347 | // children contribute no geometry (it is empty, or holds only |
| 1348 | // non-area-enclosing elements) clips EVERYTHING away: the |
| 1349 | // referencing element disappears. `W` with no current path is |
| 1350 | // undefined in PDF and consumers treat it as a no-op, which |
| 1351 | // would leave the element fully visible instead — so emit a |
| 1352 | // zero-extent rectangle to make the empty region explicit. |
| 1353 | $stream->rectangle(0.0, 0.0, 0.0, 0.0); |
| 1354 | } |
| 1355 | $rule = self::resolveClipRule($clipPath); |
| 1356 | if ($rule === 'evenodd') { |
| 1357 | $stream->clipEvenOdd(); |
| 1358 | } else { |
| 1359 | $stream->clip(); |
| 1360 | } |
| 1361 | $stream->endPath(); |
| 1362 | // Undo the cms in reverse order so the CTM is back to the |
| 1363 | // pre-clip user space. This has to happen AFTER `W`/`n`: ISO |
| 1364 | // 32000-2 §8.2 admits only path-construction operators inside a |
| 1365 | // path object, so a `cm` between the path and its painting |
| 1366 | // operator makes the content stream malformed and consumers drop |
| 1367 | // the clip (an `objectBoundingBox` clipPath then either vanished |
| 1368 | // or failed to clip at all). Reordering is safe — the region |
| 1369 | // `W` establishes already lives in device space, so it survives |
| 1370 | // the CTM changes that follow. |
| 1371 | if ($clipTransform !== null) { |
| 1372 | $stream->concatMatrix(...self::inverseAffine($clipTransform)); |
| 1373 | } |
| 1374 | if ($bboxMatrix !== null) { |
| 1375 | $stream->concatMatrix(...self::inverseAffine($bboxMatrix)); |
| 1376 | } |
| 1377 | } |
| 1378 | |
| 1379 | /** |
| 1380 | * Inverse of a 3×2 affine matrix in PDF `[a b c d e f]` order. The |
| 1381 | * full 3×3 affine has bottom row `[0 0 1]` so we only need the six |
| 1382 | * SVG/PDF entries. Singular matrices (det == 0) shouldn't occur |
| 1383 | * for any transform we generate; if one does, returning identity |
| 1384 | * makes the worst-case behaviour "no inverse applied" rather than |
| 1385 | * a divide-by-zero. |
| 1386 | * |
| 1387 | * The top of {@see matrixStack} — the cumulative SVG→page transform in |
| 1388 | * effect for the element currently being painted. |
| 1389 | * |
| 1390 | * @return array{float, float, float, float, float, float} |
| 1391 | */ |
| 1392 | private function currentMatrix(): array |
| 1393 | { |
| 1394 | return $this->matrixStack[count($this->matrixStack) - 1]; |
| 1395 | } |
| 1396 | |
| 1397 | /** |
| 1398 | * Concatenate `$m` onto the current cumulative matrix (outer × inner, the |
| 1399 | * same order a `cm` operator composes onto the CTM) and push the result. |
| 1400 | * Callers must {@see popMatrix} when the corresponding graphics-state save |
| 1401 | * is restored. |
| 1402 | * |
| 1403 | * @param array{float, float, float, float, float, float} $m |
| 1404 | */ |
| 1405 | private function pushMatrix(array $m): void |
| 1406 | { |
| 1407 | $this->matrixStack[] = self::multiplyAffine($this->currentMatrix(), $m); |
| 1408 | } |
| 1409 | |
| 1410 | private function popMatrix(): void |
| 1411 | { |
| 1412 | if (count($this->matrixStack) > 1) { |
| 1413 | array_pop($this->matrixStack); |
| 1414 | } |
| 1415 | } |
| 1416 | |
| 1417 | /** |
| 1418 | * Affine composition `m1 × m2` (m1 applied after m2), matching the PDF |
| 1419 | * `cm` convention and {@see \Phpdftk\Svg\Value\Transform}. |
| 1420 | * |
| 1421 | * @param array{float, float, float, float, float, float} $m1 |
| 1422 | * @param array{float, float, float, float, float, float} $m2 |
| 1423 | * @return array{float, float, float, float, float, float} |
| 1424 | */ |
| 1425 | private static function multiplyAffine(array $m1, array $m2): array |
| 1426 | { |
| 1427 | [$a1, $b1, $c1, $d1, $e1, $f1] = $m1; |
| 1428 | [$a2, $b2, $c2, $d2, $e2, $f2] = $m2; |
| 1429 | |
| 1430 | return [ |
| 1431 | $a1 * $a2 + $c1 * $b2, |
| 1432 | $b1 * $a2 + $d1 * $b2, |
| 1433 | $a1 * $c2 + $c1 * $d2, |
| 1434 | $b1 * $c2 + $d1 * $d2, |
| 1435 | $a1 * $e2 + $c1 * $f2 + $e1, |
| 1436 | $b1 * $e2 + $d1 * $f2 + $f1, |
| 1437 | ]; |
| 1438 | } |
| 1439 | |
| 1440 | /** |
| 1441 | * @param array{float, float, float, float, float, float} $m |
| 1442 | * @return array{float, float, float, float, float, float} |
| 1443 | */ |
| 1444 | private static function inverseAffine(array $m): array |
| 1445 | { |
| 1446 | [$a, $b, $c, $d, $e, $f] = $m; |
| 1447 | $det = $a * $d - $b * $c; |
| 1448 | if (abs($det) < 1.0e-12) { |
| 1449 | return [1.0, 0.0, 0.0, 1.0, 0.0, 0.0]; |
| 1450 | } |
| 1451 | return [ |
| 1452 | $d / $det, |
| 1453 | -$b / $det, |
| 1454 | -$c / $det, |
| 1455 | $a / $det, |
| 1456 | ($c * $f - $d * $e) / $det, |
| 1457 | ($b * $e - $a * $f) / $det, |
| 1458 | ]; |
| 1459 | } |
| 1460 | |
| 1461 | /** |
| 1462 | * `clip-rule` per SVG 2 §14.4.4. The attribute lives on the |
| 1463 | * `<clipPath>` element itself at 3R+3; per-child clip-rule support |
| 1464 | * (the spec allows overriding on individual children) lands later. |
| 1465 | * |
| 1466 | * @return 'nonzero'|'evenodd' |
| 1467 | */ |
| 1468 | private static function resolveClipRule(ClipPath $clipPath): string |
| 1469 | { |
| 1470 | $raw = $clipPath->getAttribute('clip-rule'); |
| 1471 | return strtolower(trim($raw ?? '')) === 'evenodd' ? 'evenodd' : 'nonzero'; |
| 1472 | } |
| 1473 | |
| 1474 | /** |
| 1475 | * Emit just the geometry of an element — the path operators that |
| 1476 | * would have ended up before the fill/stroke op. Used by |
| 1477 | * `applyClipPath` to assemble a clipping region without painting. |
| 1478 | */ |
| 1479 | private function emitElementPath(Element $element, ContentStream $stream): void |
| 1480 | { |
| 1481 | match (true) { |
| 1482 | $element instanceof Rect => $this->emitRectPath($element, $stream), |
| 1483 | $element instanceof Circle => $this->emitCirclePath($element, $stream), |
| 1484 | $element instanceof Ellipse => $this->emitEllipsePathFor($element, $stream), |
| 1485 | $element instanceof Polyline => $this->emitPolylinePath($element, $stream), |
| 1486 | $element instanceof Polygon => $this->emitPolygonPath($element, $stream), |
| 1487 | $element instanceof Path => $this->emitPathPath($element, $stream), |
| 1488 | // `<line>` and other non-area-enclosing children don't |
| 1489 | // contribute to a clip region per SVG 2 §14.4.1. |
| 1490 | default => null, |
| 1491 | }; |
| 1492 | } |
| 1493 | |
| 1494 | /** @return bool whether any geometry was emitted. */ |
| 1495 | private function emitRectPath(Rect $rect, ContentStream $stream): bool |
| 1496 | { |
| 1497 | $vp = $this->currentViewport(); |
| 1498 | $x = $this->geometryLength($rect, 'x', $vp['w']) ?? 0.0; |
| 1499 | $y = $this->geometryLength($rect, 'y', $vp['h']) ?? 0.0; |
| 1500 | // A negative `width` / `height` is invalid, so the declaration |
| 1501 | // is ignored and the initial value 0 stands — nothing paints, |
| 1502 | // which the `> 0.0` guard already expresses. |
| 1503 | $w = $this->geometryLength($rect, 'width', $vp['w']) ?? 0.0; |
| 1504 | $h = $this->geometryLength($rect, 'height', $vp['h']) ?? 0.0; |
| 1505 | if ($w <= 0.0 || $h <= 0.0) { |
| 1506 | return false; |
| 1507 | } |
| 1508 | [$rx, $ry] = $this->rectCornerRadii($rect, $w, $h, $vp); |
| 1509 | if ($rx <= 0.0 || $ry <= 0.0) { |
| 1510 | $stream->rectangle($x, $y, $w, $h); |
| 1511 | return true; |
| 1512 | } |
| 1513 | self::emitRoundedRectPath($stream, $x, $y, $w, $h, $rx, $ry); |
| 1514 | return true; |
| 1515 | } |
| 1516 | |
| 1517 | /** |
| 1518 | * SVG 2 §10.4 — the used `rx` / `ry` of a `<rect>`. |
| 1519 | * |
| 1520 | * Both radii are `auto` by default, and an `auto` radius mirrors |
| 1521 | * the other one, so `rx="8"` alone rounds both axes by 8. A |
| 1522 | * NEGATIVE radius is invalid: the declaration is ignored, which |
| 1523 | * leaves `auto` in force. Percentages are §10.1 geometry |
| 1524 | * percentages — `rx` against the viewport WIDTH, `ry` against its |
| 1525 | * HEIGHT, never against the rectangle's own box. Finally each |
| 1526 | * radius is clamped to half its side, so an over-large radius |
| 1527 | * degenerates into a stadium instead of self-intersecting. |
| 1528 | * |
| 1529 | * @param array{w: float, h: float} $vp |
| 1530 | * @return array{float, float} |
| 1531 | */ |
| 1532 | private function rectCornerRadii(Rect $rect, float $w, float $h, array $vp): array |
| 1533 | { |
| 1534 | $rx = $this->geometryLength($rect, 'rx', $vp['w']); |
| 1535 | $ry = $this->geometryLength($rect, 'ry', $vp['h']); |
| 1536 | if ($rx !== null && $rx < 0.0) { |
| 1537 | $rx = null; |
| 1538 | } |
| 1539 | if ($ry !== null && $ry < 0.0) { |
| 1540 | $ry = null; |
| 1541 | } |
| 1542 | $rx ??= $ry; |
| 1543 | $ry ??= $rx; |
| 1544 | if ($rx === null || $ry === null) { |
| 1545 | return [0.0, 0.0]; |
| 1546 | } |
| 1547 | return [min($rx, $w / 2.0), min($ry, $h / 2.0)]; |
| 1548 | } |
| 1549 | |
| 1550 | /** |
| 1551 | * A rounded rectangle as four straight edges joined by four |
| 1552 | * quarter-ellipse corners. |
| 1553 | * |
| 1554 | * PDF's `re` operator only draws square corners, so this is the |
| 1555 | * lowering. Corner arcs reuse the same `KAPPA` cubic approximation |
| 1556 | * `emitEllipsePath()` uses, which keeps a fully-rounded rect |
| 1557 | * (`rx = w/2`, `ry = h/2`) pixel-consistent with the `<ellipse>` |
| 1558 | * that describes the same shape. |
| 1559 | */ |
| 1560 | private static function emitRoundedRectPath( |
| 1561 | ContentStream $stream, |
| 1562 | float $x, |
| 1563 | float $y, |
| 1564 | float $w, |
| 1565 | float $h, |
| 1566 | float $rx, |
| 1567 | float $ry, |
| 1568 | ): void { |
| 1569 | $kx = $rx * self::KAPPA; |
| 1570 | $ky = $ry * self::KAPPA; |
| 1571 | $right = $x + $w; |
| 1572 | $top = $y + $h; |
| 1573 | $stream |
| 1574 | ->moveTo($x + $rx, $y) |
| 1575 | ->lineTo($right - $rx, $y) |
| 1576 | ->curveTo($right - $rx + $kx, $y, $right, $y + $ry - $ky, $right, $y + $ry) |
| 1577 | ->lineTo($right, $top - $ry) |
| 1578 | ->curveTo($right, $top - $ry + $ky, $right - $rx + $kx, $top, $right - $rx, $top) |
| 1579 | ->lineTo($x + $rx, $top) |
| 1580 | ->curveTo($x + $rx - $kx, $top, $x, $top - $ry + $ky, $x, $top - $ry) |
| 1581 | ->lineTo($x, $y + $ry) |
| 1582 | ->curveTo($x, $y + $ry - $ky, $x + $rx - $kx, $y, $x + $rx, $y) |
| 1583 | ->closePath(); |
| 1584 | } |
| 1585 | |
| 1586 | /** |
| 1587 | * The 1%-basis for a relative length unit: the supplied viewport |
| 1588 | * extent for `%`, and the document's OWN outermost viewport for the |
| 1589 | * `v*` units. An embedded resource's outermost viewport is the |
| 1590 | * `<image>` box it was given, which is exactly what makes `50vw` |
| 1591 | * inside an `<image href="…svg">` mean half that box. |
| 1592 | */ |
| 1593 | /** |
| 1594 | * Evaluate a CSS math function (`calc()`, `min()`, `max()`, |
| 1595 | * `clamp()`, …) that appeared in a geometry attribute, in CSS px. |
| 1596 | * |
| 1597 | * Percentages resolve against `$basis`, which is the SAME per-axis |
| 1598 | * basis the plain-length path uses — the viewport width for `x` / |
| 1599 | * `width`, its height for `y` / `height`, and the normalized |
| 1600 | * diagonal for a circle's `r` (§10.1). `em` resolves against the |
| 1601 | * element's own computed `font-size`, which the cascade projection |
| 1602 | * has already put in reach. |
| 1603 | * |
| 1604 | * Returns null when the expression can't be reduced to a number — |
| 1605 | * an unsupported function, or a percentage with no basis. That |
| 1606 | * reads as an invalid declaration, so the caller falls back to the |
| 1607 | * property's initial value rather than to a half-evaluated one. |
| 1608 | */ |
| 1609 | private function evaluateMathFunction(string $raw, Element $element, float $basis): ?float |
| 1610 | { |
| 1611 | $parsed = (new ValueParser())->parseFromString($raw); |
| 1612 | if (!$parsed instanceof Calc) { |
| 1613 | return null; |
| 1614 | } |
| 1615 | $root = $this->rootViewport ?? $this->currentViewport(); |
| 1616 | $fontSize = $element->fontSize() ?? 16.0; |
| 1617 | $pixels = CalcEvaluator::evaluate($parsed, new LengthContext( |
| 1618 | parentFontSize: $fontSize, |
| 1619 | currentFontSize: $fontSize, |
| 1620 | viewportWidth: $root['w'], |
| 1621 | viewportHeight: $root['h'], |
| 1622 | percentageBasis: $basis, |
| 1623 | )); |
| 1624 | return is_nan($pixels) || is_infinite($pixels) ? null : $pixels; |
| 1625 | } |
| 1626 | |
| 1627 | private function relativeLengthBasis(string $unit, float $percentBasis): float |
| 1628 | { |
| 1629 | if ($unit === '%') { |
| 1630 | return $percentBasis; |
| 1631 | } |
| 1632 | $root = $this->rootViewport ?? $this->currentViewport(); |
| 1633 | return match ($unit) { |
| 1634 | 'vw' => $root['w'], |
| 1635 | 'vh' => $root['h'], |
| 1636 | 'vmin' => min($root['w'], $root['h']), |
| 1637 | 'vmax' => max($root['w'], $root['h']), |
| 1638 | default => $percentBasis, |
| 1639 | }; |
| 1640 | } |
| 1641 | |
| 1642 | /** |
| 1643 | * Width / height of the current viewport in viewBox units. Falls back |
| 1644 | * to the root SVG width/height attributes when no `viewBox` is set, and |
| 1645 | * to zero when neither is available — matching SVG 2's "no useful |
| 1646 | * viewport" outcome (percentages collapse to 0). Nested `<svg>` / |
| 1647 | * `<symbol>` viewports land later; this picks the document root, which |
| 1648 | * is what `background-image: url(...svg)` paints into. |
| 1649 | * |
| 1650 | * @return array{w: float, h: float} |
| 1651 | */ |
| 1652 | private function currentViewport(): array |
| 1653 | { |
| 1654 | // Innermost nested `<svg>` viewport wins for percentage resolution. |
| 1655 | if ($this->viewportStack !== []) { |
| 1656 | return $this->viewportStack[count($this->viewportStack) - 1]; |
| 1657 | } |
| 1658 | if ($this->document === null) { |
| 1659 | return ['w' => 0.0, 'h' => 0.0]; |
| 1660 | } |
| 1661 | $viewBox = $this->document->viewBox(); |
| 1662 | if ($viewBox !== null) { |
| 1663 | return ['w' => $viewBox[2], 'h' => $viewBox[3]]; |
| 1664 | } |
| 1665 | $w = self::parseLengthPrefixForViewport($this->document->widthAttribute()); |
| 1666 | $h = self::parseLengthPrefixForViewport($this->document->heightAttribute()); |
| 1667 | if ($w !== null && $h !== null) { |
| 1668 | // Mirror SvgRenderer::resolveSourceRect's near-integral |
| 1669 | // snap (#143 / crbug.com/1392140): an SVG with |
| 1670 | // `width="99.99999"` resolves child `width="100%"` to |
| 1671 | // 100, matching the integer-snap browsers apply to |
| 1672 | // <img>-embedded SVG intrinsic dimensions. Without this, |
| 1673 | // the inner viewport stays at 99.99999 even after the |
| 1674 | // outer rendering box rounds to 100, so a `width="100%"` |
| 1675 | // child paints 0.00001 short of the box's right edge. |
| 1676 | return ['w' => (float) round($w), 'h' => (float) round($h)]; |
| 1677 | } |
| 1678 | // Fall back to the caller's effective viewport (the destination |
| 1679 | // rect from `SvgRenderer::draw`) when document attributes alone |
| 1680 | // can't give a useful viewport — e.g. an SVG with only a |
| 1681 | // percentage `width` and no `height` or `viewBox`. |
| 1682 | if ($this->effectiveViewport !== null) { |
| 1683 | return $this->effectiveViewport; |
| 1684 | } |
| 1685 | return ['w' => $w ?? 0.0, 'h' => $h ?? 0.0]; |
| 1686 | } |
| 1687 | |
| 1688 | private static function parseLengthPrefixForViewport(?string $raw): ?float |
| 1689 | { |
| 1690 | if ($raw === null) { |
| 1691 | return null; |
| 1692 | } |
| 1693 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+))\s*([%a-zA-Z]*)/', $raw, $m) !== 1) { |
| 1694 | return null; |
| 1695 | } |
| 1696 | // Percentage attributes carry no intrinsic viewport extent — they |
| 1697 | // resolve against the caller-supplied effective viewport (CSS |
| 1698 | // Images 3 §5.2). Reject so the fallback path picks up the |
| 1699 | // dst-derived viewport instead of mis-anchoring to the bare |
| 1700 | // percentage value. |
| 1701 | if ($m[2] === '%') { |
| 1702 | return null; |
| 1703 | } |
| 1704 | return (float) $m[1]; |
| 1705 | } |
| 1706 | |
| 1707 | /** @return bool whether any geometry was emitted. */ |
| 1708 | private function emitCirclePath(Circle $circle, ContentStream $stream): bool |
| 1709 | { |
| 1710 | $vp = $this->currentViewport(); |
| 1711 | $cx = $this->geometryLength($circle, 'cx', $vp['w']) ?? 0.0; |
| 1712 | $cy = $this->geometryLength($circle, 'cy', $vp['h']) ?? 0.0; |
| 1713 | // SVG 2 §10.1: a percentage `r` resolves against the NORMALIZED |
| 1714 | // DIAGONAL, not either axis. A negative `r` is invalid — the |
| 1715 | // declaration is ignored and the initial 0 stands, so nothing |
| 1716 | // paints. |
| 1717 | $r = $this->geometryLength($circle, 'r', self::normalizedDiagonal($vp)) ?? 0.0; |
| 1718 | if ($r <= 0.0) { |
| 1719 | return false; |
| 1720 | } |
| 1721 | $this->emitEllipsePath($stream, $cx, $cy, $r, $r); |
| 1722 | return true; |
| 1723 | } |
| 1724 | |
| 1725 | /** @return bool whether any geometry was emitted. */ |
| 1726 | private function emitEllipsePathFor(Ellipse $ellipse, ContentStream $stream): bool |
| 1727 | { |
| 1728 | $vp = $this->currentViewport(); |
| 1729 | $cx = $this->geometryLength($ellipse, 'cx', $vp['w']) ?? 0.0; |
| 1730 | $cy = $this->geometryLength($ellipse, 'cy', $vp['h']) ?? 0.0; |
| 1731 | $rx = $this->geometryLength($ellipse, 'rx', $vp['w']); |
| 1732 | $ry = $this->geometryLength($ellipse, 'ry', $vp['h']); |
| 1733 | // SVG 2 §10.1 — `rx` / `ry` initial value is `auto`, and a |
| 1734 | // NEGATIVE radius is invalid: the declaration is ignored, which |
| 1735 | // leaves `auto` in force rather than collapsing the shape. Each |
| 1736 | // `auto` radius then mirrors the other, so |
| 1737 | // `<ellipse rx="-65" ry="65">` paints a circle of r=65. |
| 1738 | if ($rx !== null && $rx < 0.0) { |
| 1739 | $rx = null; |
| 1740 | } |
| 1741 | if ($ry !== null && $ry < 0.0) { |
| 1742 | $ry = null; |
| 1743 | } |
| 1744 | $rx ??= $ry; |
| 1745 | $ry ??= $rx; |
| 1746 | if ($rx === null || $ry === null || $rx <= 0.0 || $ry <= 0.0) { |
| 1747 | return false; |
| 1748 | } |
| 1749 | $this->emitEllipsePath($stream, $cx, $cy, $rx, $ry); |
| 1750 | return true; |
| 1751 | } |
| 1752 | |
| 1753 | /** |
| 1754 | * SVG 2 §10.1 — resolve one geometry property for `$element`. |
| 1755 | * |
| 1756 | * The value may be written as a presentation attribute or come from |
| 1757 | * the cascade (which {@see SvgCascadeProjector} projects into |
| 1758 | * `style`); {@see Element::geometryValue()} reads both. `$basis` is |
| 1759 | * the 1%-basis for the property's axis: viewport width for |
| 1760 | * `x`/`width`/`cx`/`rx`, height for `y`/`height`/`cy`/`ry`, and the |
| 1761 | * normalized diagonal for `r`. |
| 1762 | * |
| 1763 | * Returns null when the property is absent or is not a length (an |
| 1764 | * `auto` keyword, a `calc()` we don't evaluate here), so callers can |
| 1765 | * apply that property's own initial-value rule instead of guessing. |
| 1766 | */ |
| 1767 | private function geometryLength(Element $element, string $property, float $basis): ?float |
| 1768 | { |
| 1769 | $raw = $element->geometryValue($property); |
| 1770 | if ($raw === null || trim($raw) === '') { |
| 1771 | return null; |
| 1772 | } |
| 1773 | // SVG 2 §6.7 — a geometry presentation attribute is parsed as a |
| 1774 | // CSS value, so the CSS math functions are legal in it. They |
| 1775 | // can't match the numeric fast path below (they don't start |
| 1776 | // with a digit), so route them through the CSS evaluator first. |
| 1777 | if (preg_match('/^\s*(?:calc|min|max|clamp|abs|sign|hypot)\s*\(/i', $raw) === 1) { |
| 1778 | return $this->evaluateMathFunction($raw, $element, $basis); |
| 1779 | } |
| 1780 | // Prefix match, not anchored: mirrors the leniency the shape |
| 1781 | // accessors have always had for trailing junk (`"10 20"`). |
| 1782 | if (preg_match( |
| 1783 | '/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*([a-zA-Z%]*)/', |
| 1784 | $raw, |
| 1785 | $m, |
| 1786 | ) !== 1) { |
| 1787 | return null; |
| 1788 | } |
| 1789 | $value = (float) $m[1]; |
| 1790 | $unit = strtolower($m[2]); |
| 1791 | if ($unit === '') { |
| 1792 | return $value; |
| 1793 | } |
| 1794 | if ($unit === '%' || $unit === 'vw' || $unit === 'vh' || $unit === 'vmin' || $unit === 'vmax') { |
| 1795 | return $value / 100.0 * $this->relativeLengthBasis($unit, $basis); |
| 1796 | } |
| 1797 | return $value * Element::absoluteUnitScale($unit); |
| 1798 | } |
| 1799 | |
| 1800 | /** |
| 1801 | * SVG 2 §10.1's "normalized diagonal" — `sqrt(w² + h²) / sqrt(2)`, |
| 1802 | * the 1%-basis for properties that are not tied to one axis (`r`). |
| 1803 | * |
| 1804 | * @param array{w: float, h: float} $viewport |
| 1805 | */ |
| 1806 | private static function normalizedDiagonal(array $viewport): float |
| 1807 | { |
| 1808 | return sqrt($viewport['w'] ** 2 + $viewport['h'] ** 2) / M_SQRT2; |
| 1809 | } |
| 1810 | |
| 1811 | private function emitPolylinePath(Polyline $polyline, ContentStream $stream): void |
| 1812 | { |
| 1813 | $points = $polyline->points(); |
| 1814 | if (count($points) >= 2) { |
| 1815 | $this->emitPolyPath($stream, $points, closed: false); |
| 1816 | } |
| 1817 | } |
| 1818 | |
| 1819 | private function emitPolygonPath(Polygon $polygon, ContentStream $stream): void |
| 1820 | { |
| 1821 | $points = $polygon->points(); |
| 1822 | if (count($points) >= 3) { |
| 1823 | $this->emitPolyPath($stream, $points, closed: true); |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | private function emitPathPath(Path $path, ContentStream $stream): void |
| 1828 | { |
| 1829 | $commands = $path->d()->commands; |
| 1830 | if ($commands === []) { |
| 1831 | return; |
| 1832 | } |
| 1833 | $state = new PathPainterState(); |
| 1834 | foreach ($commands as $command) { |
| 1835 | $this->emitPathCommand($command, $stream, $state); |
| 1836 | } |
| 1837 | } |
| 1838 | |
| 1839 | /** |
| 1840 | * Register (or reuse) the `ExtGState` resource encoding this |
| 1841 | * element's effective opacity. Returns the resource name or null |
| 1842 | * when no `gs` op is needed (no Page reference, or every opacity |
| 1843 | * channel is already ≥ 0.999). |
| 1844 | */ |
| 1845 | private function resolveOpacityState(Element $element): ?string |
| 1846 | { |
| 1847 | if ($this->page === null) { |
| 1848 | return null; |
| 1849 | } |
| 1850 | $opacity = $element->opacity() ?? 1.0; |
| 1851 | // SVG 2 §13.2 vs §15.2 — `fill-opacity` / `stroke-opacity` |
| 1852 | // modulate the element's OWN paint operations and reach |
| 1853 | // descendants by INHERITANCE, which the cascade projection |
| 1854 | // already carries. `opacity` is the group property that |
| 1855 | // composites a subtree as a unit. |
| 1856 | // |
| 1857 | // Folding all three into one ExtGState made a container's |
| 1858 | // fill-opacity stick to every descendant, and a child |
| 1859 | // declaring `fill-opacity: 1` had nothing to emit (its value |
| 1860 | // matched the default) so it could not escape. A container |
| 1861 | // therefore contributes only its group opacity here. |
| 1862 | $paints = self::paintsItsOwnGeometry($element); |
| 1863 | $fillOpacity = ($paints ? $element->fillOpacity() ?? 1.0 : 1.0) * $opacity; |
| 1864 | $strokeOpacity = ($paints ? $element->strokeOpacity() ?? 1.0 : 1.0) * $opacity; |
| 1865 | if ($fillOpacity >= 0.999 && $strokeOpacity >= 0.999) { |
| 1866 | return null; |
| 1867 | } |
| 1868 | return $this->page->ensureOpacityState($strokeOpacity, $fillOpacity); |
| 1869 | } |
| 1870 | |
| 1871 | /** |
| 1872 | * Whether the element emits paint operations of its own, as |
| 1873 | * opposed to being a container that only groups other elements. |
| 1874 | * |
| 1875 | * Mirrors the arms of {@see dispatchElement} that reach |
| 1876 | * `applyFillAndStroke`: only those elements have a fill or stroke |
| 1877 | * to modulate. |
| 1878 | */ |
| 1879 | private static function paintsItsOwnGeometry(Element $element): bool |
| 1880 | { |
| 1881 | return $element instanceof Rect |
| 1882 | || $element instanceof Circle |
| 1883 | || $element instanceof Ellipse |
| 1884 | || $element instanceof Line |
| 1885 | || $element instanceof Polyline |
| 1886 | || $element instanceof Polygon |
| 1887 | || $element instanceof Path |
| 1888 | || $element instanceof TextElement |
| 1889 | || $element instanceof SvgImage; |
| 1890 | } |
| 1891 | |
| 1892 | /** |
| 1893 | * Whether the element carries any stroke parameter that would |
| 1894 | * leak past a sibling shape if emitted inline. Used to decide |
| 1895 | * whether to wrap the element's painting in `q`/`Q`. |
| 1896 | */ |
| 1897 | /** |
| 1898 | * SVG 2 §13.2 / §13.6 — the line width to emit, in the element's |
| 1899 | * own user space. |
| 1900 | * |
| 1901 | * Normally that is `stroke-width` verbatim. Under |
| 1902 | * `vector-effect: non-scaling-stroke` the stroke is calculated in |
| 1903 | * the host coordinate space instead, so its on-screen thickness |
| 1904 | * must not depend on the transforms between here and the root: |
| 1905 | * dividing by the scale those transforms apply is what cancels |
| 1906 | * them out, and is the approach the harness manifest already named |
| 1907 | * for this substrate. |
| 1908 | * |
| 1909 | * Returns null when there is nothing to emit, so a shape with no |
| 1910 | * `stroke-width` and no vector effect still costs no operator. |
| 1911 | */ |
| 1912 | private function usedStrokeWidth(Element $element): ?float |
| 1913 | { |
| 1914 | $width = $element->strokeWidth(); |
| 1915 | $scale = $this->nonScalingStrokeScale($element); |
| 1916 | if ($scale === null) { |
| 1917 | return $width; |
| 1918 | } |
| 1919 | // The initial `stroke-width` is 1 (§13.2), and it scales too. |
| 1920 | return ($width ?? 1.0) / $scale; |
| 1921 | } |
| 1922 | |
| 1923 | /** |
| 1924 | * The factor `non-scaling-stroke` has to divide out, or null when |
| 1925 | * the element does not ask for the effect. |
| 1926 | * |
| 1927 | * `sqrt(|det|)` is the uniform scale the current matrix applies; |
| 1928 | * for a rotation it is 1 and for a flip it is 1, both correct. A |
| 1929 | * NON-uniform scale or a shear has no single such factor — the |
| 1930 | * spec wants the stroke outline computed in host space and mapped |
| 1931 | * back, which a PDF line width cannot express — so the geometric |
| 1932 | * mean of the two axis scales stands in for it. A degenerate |
| 1933 | * (zero-determinant) matrix collapses the geometry to nothing, so |
| 1934 | * the effect is skipped rather than dividing by zero. |
| 1935 | */ |
| 1936 | private function nonScalingStrokeScale(Element $element): ?float |
| 1937 | { |
| 1938 | if ($element->vectorEffect() !== 'non-scaling-stroke') { |
| 1939 | return null; |
| 1940 | } |
| 1941 | [$a, $b, $c, $d] = $this->currentMatrix(); |
| 1942 | $scale = sqrt(abs($a * $d - $b * $c)); |
| 1943 | return $scale > 1.0e-9 ? $scale : null; |
| 1944 | } |
| 1945 | |
| 1946 | private function needsStrokeParams(Element $element): bool |
| 1947 | { |
| 1948 | if ($element->stroke() === null || $element->stroke() instanceof None_) { |
| 1949 | return false; |
| 1950 | } |
| 1951 | if ($element->strokeWidth() !== null) { |
| 1952 | return true; |
| 1953 | } |
| 1954 | // SVG 2 §13.6 — `non-scaling-stroke` rewrites the line width |
| 1955 | // even when the author declared none, because the default 1 |
| 1956 | // still has to be divided by the transform scale. |
| 1957 | if ($element->vectorEffect() === 'non-scaling-stroke') { |
| 1958 | return true; |
| 1959 | } |
| 1960 | if ($element->strokeLinecap() !== null) { |
| 1961 | return true; |
| 1962 | } |
| 1963 | if ($element->strokeLinejoin() !== null) { |
| 1964 | return true; |
| 1965 | } |
| 1966 | if ($element->strokeMiterlimit() !== null) { |
| 1967 | return true; |
| 1968 | } |
| 1969 | if ($element->strokeDasharray() !== []) { |
| 1970 | return true; |
| 1971 | } |
| 1972 | if ($element->strokeDashoffset() !== null) { |
| 1973 | return true; |
| 1974 | } |
| 1975 | return false; |
| 1976 | } |
| 1977 | |
| 1978 | private function applyStrokeParams(Element $element, ContentStream $stream): void |
| 1979 | { |
| 1980 | $width = $this->usedStrokeWidth($element); |
| 1981 | if ($width !== null) { |
| 1982 | $stream->setLineWidth($width); |
| 1983 | } |
| 1984 | $cap = $element->strokeLinecap(); |
| 1985 | if ($cap !== null) { |
| 1986 | $stream->setLineCap(match ($cap) { |
| 1987 | 'round' => 1, |
| 1988 | 'square' => 2, |
| 1989 | default => 0, // butt |
| 1990 | }); |
| 1991 | } |
| 1992 | $join = $element->strokeLinejoin(); |
| 1993 | if ($join !== null) { |
| 1994 | $stream->setLineJoin(match ($join) { |
| 1995 | 'round' => 1, |
| 1996 | 'bevel' => 2, |
| 1997 | default => 0, // miter / miter-clip / arcs all fall back to PDF's miter |
| 1998 | }); |
| 1999 | } |
| 2000 | $miterLimit = $element->strokeMiterlimit(); |
| 2001 | if ($miterLimit !== null) { |
| 2002 | $stream->setMiterLimit($miterLimit); |
| 2003 | } |
| 2004 | $dash = $element->strokeDasharray(); |
| 2005 | if ($dash !== []) { |
| 2006 | // SVG 2 §9.6 — `pathLength` recalibrates every |
| 2007 | // distance-along-the-path quantity, so the dash pattern is |
| 2008 | // authored in the declared units and scaled here. |
| 2009 | $scale = $this->pathLengthScale($element); |
| 2010 | if (is_infinite($scale)) { |
| 2011 | // `pathLength="0"` is a scaling factor of infinity: the |
| 2012 | // first dash covers the whole path, which is a solid |
| 2013 | // stroke. Emitting no `d` operator IS that stroke. |
| 2014 | return; |
| 2015 | } |
| 2016 | $offset = (int) round(($element->strokeDashoffset() ?? 0.0) * $scale); |
| 2017 | $stream->setDashPattern( |
| 2018 | array_map(static fn(float $d): float => $d * $scale, $dash), |
| 2019 | $offset, |
| 2020 | ); |
| 2021 | } |
| 2022 | } |
| 2023 | |
| 2024 | /** |
| 2025 | * SVG 2 §9.6 — the factor that converts a distance expressed in |
| 2026 | * the author's declared `pathLength` units into user units. |
| 2027 | * |
| 2028 | * `1.0` when the element declares no `pathLength`, or when we |
| 2029 | * can't measure its geometry (an unmeasurable element must not |
| 2030 | * silently rescale its dashes). `INF` when the author declared |
| 2031 | * zero, which the spec defines as a scaling factor of infinity. |
| 2032 | */ |
| 2033 | private function pathLengthScale(Element $element): float |
| 2034 | { |
| 2035 | $declared = $element->pathLength(); |
| 2036 | if ($declared === null) { |
| 2037 | return 1.0; |
| 2038 | } |
| 2039 | $geometric = $this->geometricPathLength($element); |
| 2040 | if ($geometric === null || $geometric <= 0.0) { |
| 2041 | return 1.0; |
| 2042 | } |
| 2043 | if ($declared <= 0.0) { |
| 2044 | return INF; |
| 2045 | } |
| 2046 | return $geometric / $declared; |
| 2047 | } |
| 2048 | |
| 2049 | /** |
| 2050 | * The user agent's own computation of an element's path length, in |
| 2051 | * user units — the numerator of the `pathLength` scaling factor. |
| 2052 | * |
| 2053 | * Geometry comes from the same resolvers the painter emits from, so |
| 2054 | * a CSS-declared `r` (SVG 2 §10.1) measures the circle that |
| 2055 | * actually paints. Shapes measure ANALYTICALLY rather than from the |
| 2056 | * Bézier approximation the painter lowers them to: WPT's |
| 2057 | * `pathLength` reftests pair a shape against an equivalent |
| 2058 | * hand-written `<path>`, and the two only agree on the true |
| 2059 | * geometry. |
| 2060 | * |
| 2061 | * Returns null for elements that have no path (text, groups, |
| 2062 | * images) — `pathLength` has no meaning there. |
| 2063 | */ |
| 2064 | private function geometricPathLength(Element $element): ?float |
| 2065 | { |
| 2066 | $vp = $this->currentViewport(); |
| 2067 | if ($element instanceof Path) { |
| 2068 | return PathLengthMeasure::ofPathData($element->d()); |
| 2069 | } |
| 2070 | if ($element instanceof Rect) { |
| 2071 | // The painter emits a plain `re`, so the perimeter is the |
| 2072 | // rectangle's, with no rounded-corner correction to make. |
| 2073 | $w = $this->geometryLength($element, 'width', $vp['w']) ?? 0.0; |
| 2074 | $h = $this->geometryLength($element, 'height', $vp['h']) ?? 0.0; |
| 2075 | if ($w <= 0.0 || $h <= 0.0) { |
| 2076 | return null; |
| 2077 | } |
| 2078 | return 2.0 * ($w + $h); |
| 2079 | } |
| 2080 | if ($element instanceof Circle) { |
| 2081 | $r = $this->geometryLength($element, 'r', self::normalizedDiagonal($vp)) ?? 0.0; |
| 2082 | return $r > 0.0 ? 2.0 * M_PI * $r : null; |
| 2083 | } |
| 2084 | if ($element instanceof Ellipse) { |
| 2085 | $rx = $this->geometryLength($element, 'rx', $vp['w']); |
| 2086 | $ry = $this->geometryLength($element, 'ry', $vp['h']); |
| 2087 | if ($rx !== null && $rx < 0.0) { |
| 2088 | $rx = null; |
| 2089 | } |
| 2090 | if ($ry !== null && $ry < 0.0) { |
| 2091 | $ry = null; |
| 2092 | } |
| 2093 | $rx ??= $ry; |
| 2094 | $ry ??= $rx; |
| 2095 | if ($rx === null || $ry === null || $rx <= 0.0 || $ry <= 0.0) { |
| 2096 | return null; |
| 2097 | } |
| 2098 | return self::ellipsePerimeter($rx, $ry); |
| 2099 | } |
| 2100 | if ($element instanceof Line) { |
| 2101 | return hypot($element->x2() - $element->x1(), $element->y2() - $element->y1()); |
| 2102 | } |
| 2103 | if ($element instanceof Polyline) { |
| 2104 | return self::polylineLength($element->points(), closed: false); |
| 2105 | } |
| 2106 | if ($element instanceof Polygon) { |
| 2107 | return self::polylineLength($element->points(), closed: true); |
| 2108 | } |
| 2109 | return null; |
| 2110 | } |
| 2111 | |
| 2112 | /** |
| 2113 | * Ramanujan's second approximation to the ellipse perimeter — |
| 2114 | * relative error below 1e-9 for every eccentricity an SVG author |
| 2115 | * can write, and exact for the circle. |
| 2116 | */ |
| 2117 | private static function ellipsePerimeter(float $rx, float $ry): float |
| 2118 | { |
| 2119 | $h = (($rx - $ry) ** 2) / (($rx + $ry) ** 2); |
| 2120 | return M_PI * ($rx + $ry) |
| 2121 | * (1.0 + (3.0 * $h) / (10.0 + sqrt(4.0 - 3.0 * $h))); |
| 2122 | } |
| 2123 | |
| 2124 | /** |
| 2125 | * @param list<array{float, float}> $points |
| 2126 | */ |
| 2127 | private static function polylineLength(array $points, bool $closed): ?float |
| 2128 | { |
| 2129 | $count = count($points); |
| 2130 | if ($count < 2) { |
| 2131 | return null; |
| 2132 | } |
| 2133 | $total = 0.0; |
| 2134 | for ($i = 1; $i < $count; $i++) { |
| 2135 | $total += hypot( |
| 2136 | $points[$i][0] - $points[$i - 1][0], |
| 2137 | $points[$i][1] - $points[$i - 1][1], |
| 2138 | ); |
| 2139 | } |
| 2140 | if ($closed) { |
| 2141 | $total += hypot( |
| 2142 | $points[0][0] - $points[$count - 1][0], |
| 2143 | $points[0][1] - $points[$count - 1][1], |
| 2144 | ); |
| 2145 | } |
| 2146 | return $total > 0.0 ? $total : null; |
| 2147 | } |
| 2148 | |
| 2149 | private function dispatchElement(Element $element, ContentStream $stream): void |
| 2150 | { |
| 2151 | match (true) { |
| 2152 | $element instanceof Rect => $this->paintRect($element, $stream), |
| 2153 | $element instanceof Circle => $this->paintCircle($element, $stream), |
| 2154 | $element instanceof Ellipse => $this->paintEllipse($element, $stream), |
| 2155 | $element instanceof Line => $this->paintLine($element, $stream), |
| 2156 | $element instanceof Polyline => $this->paintPolyline($element, $stream), |
| 2157 | $element instanceof Polygon => $this->paintPolygon($element, $stream), |
| 2158 | $element instanceof Path => $this->paintPath($element, $stream), |
| 2159 | $element instanceof TextElement => $this->paintTextElement($element, $stream), |
| 2160 | $element instanceof \Phpdftk\Svg\NestedSvg => $this->paintNestedSvg($element, $stream), |
| 2161 | $element instanceof Use_ => $this->paintUse($element, $stream), |
| 2162 | $element instanceof SvgImage => $this->paintImage($element, $stream), |
| 2163 | // `<defs>` and `<symbol>` are referenceable containers: they |
| 2164 | // never paint themselves at the document level. `<use>` |
| 2165 | // expands `<defs>` / `<symbol>` referents; `clip-path` on |
| 2166 | // a painted element pulls in a `<clipPath>`; `mask` pulls |
| 2167 | // in a `<mask>`. Skipping them here also skips their |
| 2168 | // nested shape children, which is what the spec wants |
| 2169 | // (SVG 2 §5.5 / §5.6 / §14.4 / §14.5). |
| 2170 | // SVG 2 §5.7 — an element from a foreign namespace, and |
| 2171 | // everything under it, is not rendered. Without this arm |
| 2172 | // the generic "recurse into children" fallback painted an |
| 2173 | // `<svg>` that an XHTML wrapper had smuggled in. |
| 2174 | $element instanceof \Phpdftk\Svg\ForeignElement, |
| 2175 | $element instanceof Defs, |
| 2176 | $element instanceof Symbol, |
| 2177 | $element instanceof ClipPath, |
| 2178 | $element instanceof Mask, |
| 2179 | // SVG 2 §11.6 — `<marker>` is referenced via `marker-*` |
| 2180 | // properties on shapes; it never paints at the document |
| 2181 | // level. The painter pulls in a marker when it's |
| 2182 | // requested at a path vertex (future deliverable). |
| 2183 | $element instanceof \Phpdftk\Svg\Marker, |
| 2184 | // SVG 2 §13.3 — `<pattern>` is referenced via |
| 2185 | // `fill="url(#id)"` / `stroke="url(#id)"`; the painter |
| 2186 | // pulls in pattern content when a shape's paint |
| 2187 | // resolves to a pattern URL (future deliverable). |
| 2188 | $element instanceof \Phpdftk\Svg\Pattern, |
| 2189 | // SVG 2 Filter Effects §6.1 — `<filter>` is referenced |
| 2190 | // via `filter="url(#id)"` and applied via SoftMask. Never |
| 2191 | // paints at document level. |
| 2192 | $element instanceof \Phpdftk\Svg\Filter, |
| 2193 | // SVG 2 §6.3 — `<view>` is a fragment-targeted viewport |
| 2194 | // definition. Activated only when callers pass a view id; |
| 2195 | // never paints at document level. |
| 2196 | $element instanceof \Phpdftk\Svg\View, |
| 2197 | // SVG 2 §15.2 — `<script>` content is JS; never executes |
| 2198 | // server-side and never paints. Explicit skip prevents |
| 2199 | // any nested `<text>` etc. children from leaking into the |
| 2200 | // output stream. |
| 2201 | $element instanceof \Phpdftk\Svg\Script, |
| 2202 | // SVG 2 §19 — animation elements never paint at the |
| 2203 | // static print medium. Skip to avoid recursing into any |
| 2204 | // nested `<mpath>` etc. that would otherwise fall through |
| 2205 | // to the default container walk. |
| 2206 | $element instanceof \Phpdftk\Svg\Animation => null, |
| 2207 | // SVG 2 §6.4 — `<metadata>` carries RDF/XML or other |
| 2208 | // non-render metadata. Skip explicitly so any embedded |
| 2209 | // RDF text doesn't accidentally leak. |
| 2210 | $element instanceof \Phpdftk\Svg\Metadata => null, |
| 2211 | // SVG 2 §15.3 — `<title>` and `<desc>` are accessibility |
| 2212 | // metadata that never renders directly. Skip the recursive |
| 2213 | // walk so their text content doesn't leak into output. |
| 2214 | $element instanceof \Phpdftk\Svg\Title, |
| 2215 | $element instanceof \Phpdftk\Svg\Desc, |
| 2216 | // SVG 2 §11.6 — `<foreignObject>` holds non-SVG content |
| 2217 | // (HTML / MathML). Rendering that content requires a |
| 2218 | // separate pipeline; the typed class lets callers detect |
| 2219 | // and route it. Inside the SVG dispatch we skip the |
| 2220 | // foreign tree entirely to avoid painting GenericElement |
| 2221 | // children that aren't actual SVG shapes. |
| 2222 | $element instanceof \Phpdftk\Svg\ForeignObject => null, |
| 2223 | // SVG 2 §12.1.1 — `<a>` paints its children. The PDF link |
| 2224 | // annotation (which is what makes the rendered region |
| 2225 | // clickable) is a future concern that needs page-relative |
| 2226 | // bounding boxes; we paint the inner content faithfully |
| 2227 | // here so the visual stays correct. |
| 2228 | $element instanceof \Phpdftk\Svg\A_ |
| 2229 | => $this->paintChildren($element, $stream), |
| 2230 | // SVG 2 §5.7 — `<switch>` picks the first child whose |
| 2231 | // conditional-processing attributes all evaluate true. |
| 2232 | $element instanceof \Phpdftk\Svg\Switch_ |
| 2233 | => $this->paintSwitch($element, $stream), |
| 2234 | // `<g>` and any other container fall through here — the |
| 2235 | // recursive walk still descends into their children. |
| 2236 | default => $this->paintChildren($element, $stream), |
| 2237 | }; |
| 2238 | } |
| 2239 | |
| 2240 | /** |
| 2241 | * SVG 2 §5.7 — paint the first child of `<switch>` whose |
| 2242 | * conditional-processing tests all evaluate true. Empty-test |
| 2243 | * children always pass. Stops after painting the first |
| 2244 | * matching child. |
| 2245 | */ |
| 2246 | private function paintSwitch(\Phpdftk\Svg\Switch_ $switch, ContentStream $stream): void |
| 2247 | { |
| 2248 | foreach ($switch->children as $child) { |
| 2249 | if (!$child instanceof Element) { |
| 2250 | continue; |
| 2251 | } |
| 2252 | if (!$this->switchChildPasses($child)) { |
| 2253 | continue; |
| 2254 | } |
| 2255 | $this->paintElement($child, $stream); |
| 2256 | return; |
| 2257 | } |
| 2258 | } |
| 2259 | |
| 2260 | /** |
| 2261 | * Evaluate the conditional-processing attributes (SVG 2 §5.8) on |
| 2262 | * an element: |
| 2263 | * |
| 2264 | * - `requiredFeatures` — legacy SVG 1.1 list of feature |
| 2265 | * URIs. All listed URIs evaluate true here so the test |
| 2266 | * never fails (matches major browser behaviour now). |
| 2267 | * - `requiredExtensions` — author-supplied extension URIs. |
| 2268 | * Any presence fails: print medium can't observe any |
| 2269 | * UA-specific extensions. A PRESENT BUT EMPTY list also |
| 2270 | * evaluates false, which §5.8.3 states outright — it is not |
| 2271 | * "no requirements". |
| 2272 | * - `systemLanguage` — comma-separated BCP 47 tags. The |
| 2273 | * test passes when at least one tag prefix-matches the |
| 2274 | * `xml:lang` (or `lang`) ancestor chain. |
| 2275 | * |
| 2276 | * These apply to ANY direct rendering element, not just the |
| 2277 | * children of a `<switch>`; `<switch>` layers its own |
| 2278 | * "first passing child only" rule on top. |
| 2279 | */ |
| 2280 | private function switchChildPasses(Element $child): bool |
| 2281 | { |
| 2282 | if ($child->hasAttribute('requiredExtensions')) { |
| 2283 | return false; |
| 2284 | } |
| 2285 | if ($child->hasAttribute('systemLanguage')) { |
| 2286 | $needed = preg_split( |
| 2287 | '/[\s,]+/', |
| 2288 | strtolower(trim($child->getAttribute('systemLanguage') ?? '')), |
| 2289 | ) ?: []; |
| 2290 | $needed = array_filter($needed, static fn(string $s): bool => $s !== ''); |
| 2291 | $documentLang = $this->resolveSystemLanguage($child); |
| 2292 | $matched = false; |
| 2293 | foreach ($needed as $tag) { |
| 2294 | if ($tag === $documentLang || str_starts_with($documentLang, $tag . '-')) { |
| 2295 | $matched = true; |
| 2296 | break; |
| 2297 | } |
| 2298 | } |
| 2299 | if (!$matched) { |
| 2300 | return false; |
| 2301 | } |
| 2302 | } |
| 2303 | return true; |
| 2304 | } |
| 2305 | |
| 2306 | /** |
| 2307 | * Walk ancestor `xml:lang` / `lang` attributes. Defaults to |
| 2308 | * `en` when nothing is set, matching the SVG default UA |
| 2309 | * behaviour for systemLanguage matching. |
| 2310 | */ |
| 2311 | private function resolveSystemLanguage(Element $element): string |
| 2312 | { |
| 2313 | for ($n = $element; $n !== null; $n = $n->parent) { |
| 2314 | $lang = $n->getAttribute('xml:lang') ?? $n->getAttribute('lang'); |
| 2315 | if ($lang !== null && $lang !== '') { |
| 2316 | return strtolower($lang); |
| 2317 | } |
| 2318 | } |
| 2319 | return 'en'; |
| 2320 | } |
| 2321 | |
| 2322 | private function paintUse(Use_ $use, ContentStream $stream): void |
| 2323 | { |
| 2324 | if ($this->document === null) { |
| 2325 | return; |
| 2326 | } |
| 2327 | // SVG 2 §5.6 — when the embedding pipeline has already |
| 2328 | // materialised the shadow tree (the HTML cascade does, so the |
| 2329 | // instance INHERITS from the `<use>`), paint that clone. Falling |
| 2330 | // back to re-resolving the `href` would paint the referenced |
| 2331 | // element as it is styled where it sits, losing everything the |
| 2332 | // `<use>` contributed. |
| 2333 | $referent = self::materialisedUseInstance($use) ?? $use->resolve($this->document); |
| 2334 | if ($referent === null) { |
| 2335 | return; |
| 2336 | } |
| 2337 | // SVG 2 §5.6.2 — referencing an ancestor of the `<use>` (or the |
| 2338 | // `<use>` itself) is an invalid circular reference: the element |
| 2339 | // is not rendered. Unguarded this recursed until the C stack |
| 2340 | // gave out and took the process with it (SIGSEGV), so a |
| 2341 | // malformed or hostile document could kill the renderer. |
| 2342 | for ($n = $use->parent; $n !== null; $n = $n->parent) { |
| 2343 | if ($n === $referent) { |
| 2344 | return; |
| 2345 | } |
| 2346 | } |
| 2347 | if ($referent === $use || $this->useExpansionsInProgress->contains($referent)) { |
| 2348 | return; |
| 2349 | } |
| 2350 | $this->useExpansionsInProgress->attach($referent, true); |
| 2351 | try { |
| 2352 | $this->paintUseResolved($use, $referent, $stream); |
| 2353 | } finally { |
| 2354 | $this->useExpansionsInProgress->detach($referent); |
| 2355 | } |
| 2356 | } |
| 2357 | |
| 2358 | /** |
| 2359 | * The body of {@see paintUse} once the referent is known to be a |
| 2360 | * legal, non-circular target. |
| 2361 | */ |
| 2362 | private function paintUseResolved(Use_ $use, Element $referent, ContentStream $stream): void |
| 2363 | { |
| 2364 | // SVG 2 §5.6 — the `<use>`'s `x` / `y` translate the referent's |
| 2365 | // coordinate system. Width / height overrides on `<symbol>` |
| 2366 | // referents resolve through viewBox-to-viewport mapping; that |
| 2367 | // mapping needs target-rectangle context we don't have until |
| 2368 | // 3R, so 3Q honours the translation only. |
| 2369 | $x = $use->x(); |
| 2370 | $y = $use->y(); |
| 2371 | // SVG 2 §5.6.1 — when the referent is a nested `<svg>`, the use's |
| 2372 | // width/height (if both set) become that svg's viewport. |
| 2373 | $useW = $use->width(); |
| 2374 | $useH = $use->height(); |
| 2375 | $override = null; |
| 2376 | if ($referent instanceof \Phpdftk\Svg\ViewportElement) { |
| 2377 | // Per axis, and only for a POSITIVE override — a zero or |
| 2378 | // absent dimension leaves the referenced element's own |
| 2379 | // value (or the 100 % default) in force. |
| 2380 | $override = [ |
| 2381 | 'w' => $useW !== null && $useW > 0.0 ? $useW : null, |
| 2382 | 'h' => $useH !== null && $useH > 0.0 ? $useH : null, |
| 2383 | ]; |
| 2384 | if ($override['w'] === null && $override['h'] === null) { |
| 2385 | $override = null; |
| 2386 | } |
| 2387 | } |
| 2388 | if ($x === 0.0 && $y === 0.0 && $override === null) { |
| 2389 | $this->paintUseReferent($referent, $stream); |
| 2390 | return; |
| 2391 | } |
| 2392 | $stream->saveGraphicsState(); |
| 2393 | if ($x !== 0.0 || $y !== 0.0) { |
| 2394 | $stream->concatMatrix(1.0, 0.0, 0.0, 1.0, $x, $y); |
| 2395 | } |
| 2396 | $prevOverride = $this->pendingUseViewport; |
| 2397 | $this->pendingUseViewport = $override; |
| 2398 | $this->paintUseReferent($referent, $stream); |
| 2399 | $this->pendingUseViewport = $prevOverride; |
| 2400 | $stream->restoreGraphicsState(); |
| 2401 | } |
| 2402 | |
| 2403 | /** |
| 2404 | * The pre-built `<use>` instance, if the embedding pipeline |
| 2405 | * materialised one. Identified by the marker attribute |
| 2406 | * {@see \Phpdftk\HtmlToPdf\Box\BoxGenerator::USE_INSTANCE_ATTRIBUTE}, |
| 2407 | * which is spelled out here rather than imported: `svg-to-pdf` must |
| 2408 | * not depend on `html-to-pdf` (the dependency runs the other way). |
| 2409 | */ |
| 2410 | private static function materialisedUseInstance(Use_ $use): ?Element |
| 2411 | { |
| 2412 | foreach ($use->children as $child) { |
| 2413 | if ($child instanceof Element |
| 2414 | && $child->getAttribute('data-phpdftk-use-instance') !== null |
| 2415 | ) { |
| 2416 | return $child; |
| 2417 | } |
| 2418 | } |
| 2419 | return null; |
| 2420 | } |
| 2421 | |
| 2422 | /** |
| 2423 | * `<symbol>` referents have their children painted directly per |
| 2424 | * SVG 2 §5.5 — referencing them via `<use>` is the only way they |
| 2425 | * paint at all. Everything else routes through normal dispatch. |
| 2426 | */ |
| 2427 | private function paintUseReferent(Element $referent, ContentStream $stream): void |
| 2428 | { |
| 2429 | // SVG 2 §8.9 — `display: none` on the referenced element |
| 2430 | // suppresses the instance too. The `<symbol>` branch below |
| 2431 | // bypasses `paintElement()`, so the check cannot live there |
| 2432 | // alone. |
| 2433 | if ($referent->displayValue() === 'none') { |
| 2434 | return; |
| 2435 | } |
| 2436 | if ($referent instanceof Symbol) { |
| 2437 | // SVG 2 §5.5 / §5.6.2 — the instance a `<use>` generates for |
| 2438 | // a `<symbol>` behaves as an `<svg>`: it establishes a |
| 2439 | // viewport, maps any `viewBox` into it, and clips to it. |
| 2440 | // Painting the children bare let a symbol's content spill |
| 2441 | // across the whole document. |
| 2442 | $this->paintViewportInstance($referent, $stream); |
| 2443 | return; |
| 2444 | } |
| 2445 | $this->paintElement($referent, $stream); |
| 2446 | } |
| 2447 | |
| 2448 | private function paintImage(SvgImage $image, ContentStream $stream): void |
| 2449 | { |
| 2450 | $href = $image->href(); |
| 2451 | if ($href === null) { |
| 2452 | return; |
| 2453 | } |
| 2454 | // SVG 2 §8.6 — an `<image>` href may carry a URL fragment |
| 2455 | // (`…#view`) selecting a `<view>` inside the referenced SVG. |
| 2456 | // The fragment is never part of the resource bytes, so it is |
| 2457 | // split off before the payload is decoded / read. |
| 2458 | [$locator, $fragment] = self::splitHrefFragment($href); |
| 2459 | // 3Q: filesystem hrefs. |
| 2460 | // 3R+18: `data:` URIs decoded and materialised to a temp |
| 2461 | // file so the same `ImageParser` + `PdfWriter::addImage` |
| 2462 | // flow (which only accepts paths) can embed them. |
| 2463 | // 4F.1: `http(s)://` hrefs route through the optional |
| 2464 | // `ResourceLoader` injected at construction. SSRF guard, |
| 2465 | // redirect handling, content-length cap, and MIME sniffing |
| 2466 | // all live in the loader; we just hand off the URL and |
| 2467 | // materialise the bytes to a temp file like the data: |
| 2468 | // path. When no loader is configured, http(s):// drops |
| 2469 | // silently per the original 3R+18 posture so existing |
| 2470 | // callers don't change behaviour. |
| 2471 | $sourcePath = $locator; |
| 2472 | $bytes = null; |
| 2473 | if (str_starts_with($locator, 'data:')) { |
| 2474 | $decoded = self::decodeDataUri($locator); |
| 2475 | if ($decoded === null) { |
| 2476 | return; |
| 2477 | } |
| 2478 | $bytes = $decoded['bytes']; |
| 2479 | $fragment = $decoded['fragment']; |
| 2480 | } elseif (str_starts_with($locator, 'http://') || str_starts_with($locator, 'https://')) { |
| 2481 | if ($this->resourceLoader === null) { |
| 2482 | return; |
| 2483 | } |
| 2484 | $bytes = $this->fetchHttpHref($locator); |
| 2485 | if ($bytes === null) { |
| 2486 | return; |
| 2487 | } |
| 2488 | } elseif (str_contains($locator, '://')) { |
| 2489 | return; |
| 2490 | } else { |
| 2491 | // Filesystem href: sniff the head only, so a large raster |
| 2492 | // still streams through `ImageParser` + `addImage` rather |
| 2493 | // than being slurped into memory here. |
| 2494 | try { |
| 2495 | $head = LocalFilesystem::readPrefix($sourcePath, 4096, 'image'); |
| 2496 | } catch (\Throwable) { |
| 2497 | return; |
| 2498 | } |
| 2499 | if (self::looksLikeSvg($head)) { |
| 2500 | try { |
| 2501 | $bytes = LocalFilesystem::readFile($sourcePath, 'svg image'); |
| 2502 | } catch (\Throwable) { |
| 2503 | return; |
| 2504 | } |
| 2505 | } |
| 2506 | } |
| 2507 | |
| 2508 | // SVG 2 §8.6 — an `<image>` referencing an SVG resource |
| 2509 | // establishes a viewport for it and renders the referenced |
| 2510 | // document's own tree into it. There is no raster to embed, |
| 2511 | // so this never reaches `PdfWriter::addImage` (which rejects |
| 2512 | // SVG bytes outright). |
| 2513 | if ($bytes !== null && self::looksLikeSvg($bytes)) { |
| 2514 | $this->paintEmbeddedSvg($image, $bytes, $fragment, $stream); |
| 2515 | return; |
| 2516 | } |
| 2517 | |
| 2518 | if ($this->writer === null || $this->page === null) { |
| 2519 | return; |
| 2520 | } |
| 2521 | $tempPath = null; |
| 2522 | if ($bytes !== null) { |
| 2523 | $tempPath = self::materialiseBytes($bytes); |
| 2524 | if ($tempPath === null) { |
| 2525 | return; |
| 2526 | } |
| 2527 | $sourcePath = $tempPath; |
| 2528 | } |
| 2529 | try { |
| 2530 | $this->paintImageFromPath($sourcePath, $image, $stream); |
| 2531 | } finally { |
| 2532 | if ($tempPath !== null) { |
| 2533 | @unlink($tempPath); |
| 2534 | } |
| 2535 | } |
| 2536 | } |
| 2537 | |
| 2538 | /** |
| 2539 | * Split an `<image>` href into its resource locator and URL |
| 2540 | * fragment. RFC 3986 makes `#` the fragment delimiter for every |
| 2541 | * URI form including `data:` (a literal `#` in a data payload has |
| 2542 | * to be percent-encoded), so the FIRST `#` wins. |
| 2543 | * |
| 2544 | * Bare filesystem paths are exempt unless the pre-`#` prefix is |
| 2545 | * itself a readable file — a `#` is a legal character in a |
| 2546 | * filename and splitting one off would break existing local |
| 2547 | * hrefs. |
| 2548 | * |
| 2549 | * @return array{0: string, 1: string|null} |
| 2550 | */ |
| 2551 | private static function splitHrefFragment(string $href): array |
| 2552 | { |
| 2553 | if (str_starts_with($href, 'data:')) { |
| 2554 | // A `data:` URI carries its payload inline, so splitting on |
| 2555 | // a bare `#` would truncate any document that inlines an |
| 2556 | // unencoded hex colour (`fill='#0f0'`) — technically |
| 2557 | // malformed per RFC 3986, but common enough that silently |
| 2558 | // blanking those documents is worse than ignoring a |
| 2559 | // fragment. {@see decodeDataUri} peels the fragment off the |
| 2560 | // decoded bytes instead, where it can tell the two apart. |
| 2561 | return [$href, null]; |
| 2562 | } |
| 2563 | $hash = strpos($href, '#'); |
| 2564 | if ($hash === false) { |
| 2565 | return [$href, null]; |
| 2566 | } |
| 2567 | $locator = substr($href, 0, $hash); |
| 2568 | $fragment = substr($href, $hash + 1); |
| 2569 | if ($locator === '') { |
| 2570 | return [$href, null]; |
| 2571 | } |
| 2572 | $isUrl = str_starts_with($href, 'http://') || str_starts_with($href, 'https://'); |
| 2573 | if (!$isUrl && !is_file($locator)) { |
| 2574 | return [$href, null]; |
| 2575 | } |
| 2576 | return [$locator, $fragment === '' ? null : $fragment]; |
| 2577 | } |
| 2578 | |
| 2579 | /** |
| 2580 | * SVG sniffer mirroring {@see ImageParser}'s: a case-insensitive |
| 2581 | * `<svg` within the head, and the document must open with an XML |
| 2582 | * declaration, a comment, a doctype, or the `<svg` tag itself. |
| 2583 | * Rules out arbitrary markup where `<svg` merely appears inside. |
| 2584 | */ |
| 2585 | private static function looksLikeSvg(string $bytes): bool |
| 2586 | { |
| 2587 | $head = substr($bytes, 0, 4096); |
| 2588 | if (stripos($head, '<svg') === false) { |
| 2589 | return false; |
| 2590 | } |
| 2591 | $trimmed = ltrim($head, " \t\r\n"); |
| 2592 | return str_starts_with($trimmed, '<?xml') |
| 2593 | || str_starts_with($trimmed, '<!--') |
| 2594 | || stripos($trimmed, '<!doctype') === 0 |
| 2595 | || stripos($trimmed, '<svg') === 0; |
| 2596 | } |
| 2597 | |
| 2598 | /** |
| 2599 | * SVG 2 §8.6 — render an SVG resource referenced by `<image>`. |
| 2600 | * |
| 2601 | * The element establishes a new viewport at `(x, y, width, |
| 2602 | * height)` with `overflow: hidden`, and the referenced document is |
| 2603 | * a SEPARATE document: nothing inherits into it, and its ids live |
| 2604 | * in their own space. That is why the tree is painted by a fresh |
| 2605 | * `Translator` rather than this one — `findById` on the host |
| 2606 | * document must not resolve against the embedded tree, or vice |
| 2607 | * versa. |
| 2608 | * |
| 2609 | * Sizing follows the CSS Images 3 §5.3 default sizing algorithm: |
| 2610 | * an omitted `width` / `height` on the `<image>` is derived from |
| 2611 | * the referenced document's intrinsic size, or from the other axis |
| 2612 | * via its intrinsic ratio. |
| 2613 | * |
| 2614 | * The viewBox-to-viewport mapping uses, in order of precedence, |
| 2615 | * the `preserveAspectRatio` on the `<image>` element (SVG 2 §8.6 |
| 2616 | * makes it override the referenced root's), then the one on an |
| 2617 | * activated `<view>`, then the referenced root's own. |
| 2618 | */ |
| 2619 | private function paintEmbeddedSvg( |
| 2620 | SvgImage $image, |
| 2621 | string $bytes, |
| 2622 | ?string $fragment, |
| 2623 | ContentStream $stream, |
| 2624 | ): void { |
| 2625 | if ($this->embeddedSvgDepth >= self::MAX_EMBEDDED_SVG_DEPTH) { |
| 2626 | return; |
| 2627 | } |
| 2628 | try { |
| 2629 | $document = (new SvgDocumentParser())->parse($bytes); |
| 2630 | } catch (\Throwable) { |
| 2631 | // Unparseable resource — SVG 2 §8.6's "no image available". |
| 2632 | return; |
| 2633 | } |
| 2634 | |
| 2635 | $viewBox = $document->viewBox(); |
| 2636 | $referencedPar = $document->getAttribute('preserveAspectRatio'); |
| 2637 | // SVG 2 §18.3 — `resource.svg#viewId` activates that `<view>`, |
| 2638 | // whose `viewBox` / `preserveAspectRatio` stand in for the |
| 2639 | // root element's for this reference. |
| 2640 | if ($fragment !== null) { |
| 2641 | $view = $document->findByFragment($fragment); |
| 2642 | if ($view instanceof SvgView) { |
| 2643 | $viewBox = $view->viewBox() ?? $viewBox; |
| 2644 | $referencedPar = $view->preserveAspectRatio() ?? $referencedPar; |
| 2645 | } |
| 2646 | } |
| 2647 | |
| 2648 | [$intrinsicW, $intrinsicH] = self::embeddedSvgIntrinsicSize($document, $viewBox); |
| 2649 | $ratio = $intrinsicW > 0.0 && $intrinsicH > 0.0 |
| 2650 | ? $intrinsicW / $intrinsicH |
| 2651 | : ($viewBox !== null && $viewBox[2] > 0.0 && $viewBox[3] > 0.0 |
| 2652 | ? $viewBox[2] / $viewBox[3] |
| 2653 | : null); |
| 2654 | |
| 2655 | $vp = $this->currentViewport(); |
| 2656 | $x = $this->resolveViewportLength($image->getAttribute('x'), $vp['w'], 0.0); |
| 2657 | $y = $this->resolveViewportLength($image->getAttribute('y'), $vp['h'], 0.0); |
| 2658 | $w = self::resolveImageExtent($image->getAttribute('width'), $vp['w']); |
| 2659 | $h = self::resolveImageExtent($image->getAttribute('height'), $vp['h']); |
| 2660 | if ($w === null && $h === null) { |
| 2661 | if ($intrinsicW > 0.0 && $intrinsicH > 0.0) { |
| 2662 | $w = $intrinsicW; |
| 2663 | $h = $intrinsicH; |
| 2664 | } else { |
| 2665 | // CSS Images 3 §5.3 default sizing with NO specified |
| 2666 | // size: the default object size for an `<image>` is |
| 2667 | // the nearest SVG viewport. A resource carrying only |
| 2668 | // an intrinsic ratio is contained within it; one with |
| 2669 | // neither size nor ratio simply takes it. This is the |
| 2670 | // `<image href="…svg"/>` case, where a referenced |
| 2671 | // document whose root is itself `width: auto; |
| 2672 | // height: auto` has no concrete size of its own. |
| 2673 | [$w, $h] = self::containWithin($vp['w'], $vp['h'], $ratio); |
| 2674 | } |
| 2675 | } elseif ($w === null) { |
| 2676 | $w = $ratio !== null ? ($h ?? 0.0) * $ratio : $intrinsicW; |
| 2677 | } elseif ($h === null) { |
| 2678 | $h = $ratio !== null && $ratio > 0.0 ? $w / $ratio : $intrinsicH; |
| 2679 | } |
| 2680 | if ($w === null || $h === null || $w <= 0.0 || $h <= 0.0) { |
| 2681 | // A zero-sized viewport disables rendering (SVG 2 §8.6). |
| 2682 | return; |
| 2683 | } |
| 2684 | |
| 2685 | // Source rect. A referenced root without a `viewBox` has one |
| 2686 | // synthesised from its intrinsic size; with neither, the |
| 2687 | // document simply lays out at the viewport's own size (1:1), |
| 2688 | // which is what makes `width="100%"` / viewport units inside |
| 2689 | // the referenced document resolve against the image box. |
| 2690 | if ($viewBox !== null && $viewBox[2] > 0.0 && $viewBox[3] > 0.0) { |
| 2691 | $srcW = $viewBox[2]; |
| 2692 | $srcH = $viewBox[3]; |
| 2693 | } elseif ($intrinsicW > 0.0 && $intrinsicH > 0.0) { |
| 2694 | $srcW = $intrinsicW; |
| 2695 | $srcH = $intrinsicH; |
| 2696 | } else { |
| 2697 | $srcW = $w; |
| 2698 | $srcH = $h; |
| 2699 | } |
| 2700 | |
| 2701 | $par = $image->preserveAspectRatio() ?? $referencedPar ?? ''; |
| 2702 | [$scaleX, $scaleY, $offsetX, $offsetY] = self::viewBoxTransform($par, $srcW, $srcH, $w, $h); |
| 2703 | |
| 2704 | $stream->saveGraphicsState(); |
| 2705 | $placement = [1.0, 0.0, 0.0, 1.0, $x, $y]; |
| 2706 | $stream->concatMatrix(...$placement); |
| 2707 | $stream->rectangle(0.0, 0.0, $w, $h); |
| 2708 | $stream->clip(); |
| 2709 | $stream->endPath(); |
| 2710 | $mapping = [$scaleX, 0.0, 0.0, $scaleY, $offsetX, $offsetY]; |
| 2711 | $stream->concatMatrix(...$mapping); |
| 2712 | |
| 2713 | // The cumulative SVG→page matrix the child inherits, so any |
| 2714 | // gradient inside the embedded document reconstructs the right |
| 2715 | // `/Matrix` (PDF resolves pattern matrices against DEFAULT |
| 2716 | // page space, not the fill-time CTM). |
| 2717 | $baseMatrix = self::multiplyAffine( |
| 2718 | self::multiplyAffine($this->currentMatrix(), $placement), |
| 2719 | $mapping, |
| 2720 | ); |
| 2721 | |
| 2722 | $child = new self($this->resourceLoader, $this->documentFontProvider); |
| 2723 | $child->embeddedSvgDepth = $this->embeddedSvgDepth + 1; |
| 2724 | $this->cascadeProjector->project($document); |
| 2725 | $child->paint( |
| 2726 | $document, |
| 2727 | $stream, |
| 2728 | $this->page, |
| 2729 | $this->writer, |
| 2730 | compensateTextFlip: $this->compensateTextFlip, |
| 2731 | effectiveViewport: ['w' => $srcW, 'h' => $srcH], |
| 2732 | baseMatrix: $baseMatrix, |
| 2733 | ); |
| 2734 | $stream->restoreGraphicsState(); |
| 2735 | } |
| 2736 | |
| 2737 | /** |
| 2738 | * Intrinsic width / height of a referenced SVG root per CSS Images |
| 2739 | * 3 §4: the `width` / `height` attributes when they are absolute |
| 2740 | * lengths, with a missing axis derived from the other plus the |
| 2741 | * `viewBox` ratio. Percentage attributes carry no intrinsic |
| 2742 | * extent. Returns `[0.0, 0.0]` when neither axis resolves. |
| 2743 | * |
| 2744 | * @param array{0: float, 1: float, 2: float, 3: float}|null $viewBox |
| 2745 | * @return array{0: float, 1: float} |
| 2746 | */ |
| 2747 | private static function embeddedSvgIntrinsicSize( |
| 2748 | SvgDocument $document, |
| 2749 | ?array $viewBox, |
| 2750 | ): array { |
| 2751 | $w = self::parseLengthPrefixForViewport($document->widthAttribute()); |
| 2752 | $h = self::parseLengthPrefixForViewport($document->heightAttribute()); |
| 2753 | $ratio = $viewBox !== null && $viewBox[2] > 0.0 && $viewBox[3] > 0.0 |
| 2754 | ? $viewBox[2] / $viewBox[3] |
| 2755 | : null; |
| 2756 | if ($w !== null && $h === null && $ratio !== null) { |
| 2757 | $h = $w / $ratio; |
| 2758 | } elseif ($h !== null && $w === null && $ratio !== null) { |
| 2759 | $w = $h * $ratio; |
| 2760 | } |
| 2761 | if ($w === null || $h === null || $w <= 0.0 || $h <= 0.0) { |
| 2762 | return [0.0, 0.0]; |
| 2763 | } |
| 2764 | return [$w, $h]; |
| 2765 | } |
| 2766 | |
| 2767 | /** |
| 2768 | * An `<image>` `width` / `height` attribute as a used length: |
| 2769 | * `null` for absent / `auto` / negative (all of which mean "derive |
| 2770 | * it"), a percentage resolved against the enclosing viewport, and |
| 2771 | * anything else through the element's own unit-aware parse. |
| 2772 | */ |
| 2773 | /** |
| 2774 | * CSS Images 3 §5.3's contain constraint: the largest rectangle |
| 2775 | * with `$ratio` (width ÷ height) that fits inside `$w` × `$h`. A |
| 2776 | * null ratio has nothing to preserve, so the box is taken whole. |
| 2777 | * |
| 2778 | * @return array{0: float, 1: float} |
| 2779 | */ |
| 2780 | private static function containWithin(float $w, float $h, ?float $ratio): array |
| 2781 | { |
| 2782 | if ($ratio === null || $ratio <= 0.0) { |
| 2783 | return [$w, $h]; |
| 2784 | } |
| 2785 | $widthAtFullHeight = $h * $ratio; |
| 2786 | return $widthAtFullHeight <= $w |
| 2787 | ? [$widthAtFullHeight, $h] |
| 2788 | : [$w, $w / $ratio]; |
| 2789 | } |
| 2790 | |
| 2791 | private static function resolveImageExtent(?string $raw, float $viewport): ?float |
| 2792 | { |
| 2793 | if ($raw === null) { |
| 2794 | return null; |
| 2795 | } |
| 2796 | $trimmed = trim($raw); |
| 2797 | if ($trimmed === '' || strtolower($trimmed) === 'auto') { |
| 2798 | return null; |
| 2799 | } |
| 2800 | if (preg_match('/^([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*%$/', $trimmed, $m) === 1) { |
| 2801 | $value = ((float) $m[1]) / 100.0 * $viewport; |
| 2802 | return $value < 0.0 ? null : $value; |
| 2803 | } |
| 2804 | $plain = self::parseLengthPrefixForViewport($trimmed); |
| 2805 | if ($plain === null || $plain < 0.0) { |
| 2806 | return null; |
| 2807 | } |
| 2808 | return $plain; |
| 2809 | } |
| 2810 | |
| 2811 | private function paintImageFromPath(string $path, SvgImage $image, ContentStream $stream): void |
| 2812 | { |
| 2813 | // Resolve intrinsic source dimensions before registering so we |
| 2814 | // can fall back to them when the SVG omits width / height. |
| 2815 | // `ImageParser::parse` is cheap (header-only read) and |
| 2816 | // bypassing the writer keeps this self-contained. |
| 2817 | try { |
| 2818 | $info = ImageParser::parse($path); |
| 2819 | } catch (\Throwable) { |
| 2820 | return; |
| 2821 | } |
| 2822 | if ($this->writer === null || $this->page === null) { |
| 2823 | return; |
| 2824 | } |
| 2825 | try { |
| 2826 | $resourceName = $this->writer->addImage($path, $this->page); |
| 2827 | } catch (\Throwable) { |
| 2828 | // Missing file / unparseable bytes / unsupported format — |
| 2829 | // SVG 2 §12.6's "no image available" outcome is to paint |
| 2830 | // nothing. |
| 2831 | return; |
| 2832 | } |
| 2833 | |
| 2834 | $x = $image->x(); |
| 2835 | $y = $image->y(); |
| 2836 | $w = $image->width(); |
| 2837 | $h = $image->height(); |
| 2838 | $intrinsicW = (float) $info->width; |
| 2839 | $intrinsicH = (float) $info->height; |
| 2840 | // SVG 2 §12.6 fallback ladder for missing width / height: when |
| 2841 | // one dimension is given the other is scaled to preserve the |
| 2842 | // intrinsic aspect ratio; when both are absent the intrinsic |
| 2843 | // dimensions are used directly. A zero-size intrinsic image |
| 2844 | // still paints nothing. |
| 2845 | if ($intrinsicW <= 0.0 || $intrinsicH <= 0.0) { |
| 2846 | return; |
| 2847 | } |
| 2848 | if ($w === null && $h === null) { |
| 2849 | $w = $intrinsicW; |
| 2850 | $h = $intrinsicH; |
| 2851 | } elseif ($w === null) { |
| 2852 | // height set, width follows the intrinsic aspect. |
| 2853 | $w = ($h ?? 0.0) * ($intrinsicW / $intrinsicH); |
| 2854 | } elseif ($h === null) { |
| 2855 | $h = $w * ($intrinsicH / $intrinsicW); |
| 2856 | } |
| 2857 | if ($w <= 0.0 || $h <= 0.0) { |
| 2858 | return; |
| 2859 | } |
| 2860 | |
| 2861 | // PDF Do paints the image inside a unit square at (0, 0) → (1, 1). |
| 2862 | // The transformation matrix translates + scales it to the SVG |
| 2863 | // rectangle. Y is flipped so the image's top-left lands at |
| 2864 | // (x, y) — PDF's image space is y-down within the unit square, |
| 2865 | // SVG's image element is y-down too, so the flip cancels them |
| 2866 | // out and the image renders right-side-up at the SVG-stated |
| 2867 | // position. |
| 2868 | $stream->saveGraphicsState(); |
| 2869 | $stream->concatMatrix($w, 0.0, 0.0, -$h, $x, $y + $h); |
| 2870 | $stream->doXObject($resourceName); |
| 2871 | $stream->restoreGraphicsState(); |
| 2872 | } |
| 2873 | |
| 2874 | /** |
| 2875 | * Decode a `data:` URI per RFC 2397. |
| 2876 | * |
| 2877 | * - `data:image/png;base64,iVBOR…` → base64 payload |
| 2878 | * - `data:image/svg+xml,<svg…>` → percent-decoded payload |
| 2879 | * - `data:,hello` → empty mime, percent-decoded |
| 2880 | * |
| 2881 | * Returns `null` if the URI is malformed or the base64 won't |
| 2882 | * decode. The MIME type is returned for the caller's information |
| 2883 | * but is not authoritative — `ImageParser::parse` still sniffs the |
| 2884 | * actual bytes to determine the PDF colour space + filter. |
| 2885 | * |
| 2886 | * A URL fragment (`…svg%3e#view`) is peeled off here rather than |
| 2887 | * by {@see splitHrefFragment}, because only after decoding can a |
| 2888 | * real fragment be told apart from a `#` the author inlined in the |
| 2889 | * payload. Base64 data has an alphabet that excludes `#`, so the |
| 2890 | * first one delimits; percent-encoded data can contain anything, |
| 2891 | * so a fragment is recognised only when it is the whole remainder |
| 2892 | * after the document's final `>` — which an inline `fill='#0f0'` |
| 2893 | * never is. |
| 2894 | * |
| 2895 | * @return array{bytes: string, mime: string, fragment: string|null}|null |
| 2896 | */ |
| 2897 | private static function decodeDataUri(string $uri): ?array |
| 2898 | { |
| 2899 | if (!str_starts_with($uri, 'data:')) { |
| 2900 | return null; |
| 2901 | } |
| 2902 | $rest = substr($uri, 5); |
| 2903 | $commaPos = strpos($rest, ','); |
| 2904 | if ($commaPos === false) { |
| 2905 | return null; |
| 2906 | } |
| 2907 | $meta = substr($rest, 0, $commaPos); |
| 2908 | $data = substr($rest, $commaPos + 1); |
| 2909 | $isBase64 = false; |
| 2910 | $mime = ''; |
| 2911 | if ($meta !== '') { |
| 2912 | $parts = explode(';', $meta); |
| 2913 | $mime = $parts[0]; |
| 2914 | foreach (array_slice($parts, 1) as $param) { |
| 2915 | if ($param === 'base64') { |
| 2916 | $isBase64 = true; |
| 2917 | } |
| 2918 | } |
| 2919 | } |
| 2920 | $fragment = null; |
| 2921 | if ($isBase64) { |
| 2922 | $hash = strpos($data, '#'); |
| 2923 | if ($hash !== false) { |
| 2924 | $fragment = substr($data, $hash + 1); |
| 2925 | $data = substr($data, 0, $hash); |
| 2926 | } |
| 2927 | $bytes = base64_decode($data, true); |
| 2928 | if ($bytes === false) { |
| 2929 | return null; |
| 2930 | } |
| 2931 | } else { |
| 2932 | $bytes = rawurldecode($data); |
| 2933 | if (preg_match('/^(?<doc>.*>)\s*#(?<fragment>[^>#\s]+)\s*$/s', $bytes, $m) === 1) { |
| 2934 | $bytes = $m['doc']; |
| 2935 | $fragment = $m['fragment']; |
| 2936 | } |
| 2937 | } |
| 2938 | return [ |
| 2939 | 'bytes' => $bytes, |
| 2940 | 'mime' => $mime, |
| 2941 | 'fragment' => ($fragment === null || $fragment === '') ? null : $fragment, |
| 2942 | ]; |
| 2943 | } |
| 2944 | |
| 2945 | /** |
| 2946 | * Write decoded `<image>` payload bytes to a temp file that lives |
| 2947 | * only for the duration of `paintImage`. Returns the path on |
| 2948 | * success or `null` if either the temp file couldn't be opened or |
| 2949 | * the write failed — both fall back to the SVG "no image |
| 2950 | * available" outcome. Only the raster path needs this; SVG |
| 2951 | * payloads are painted straight from the byte string. |
| 2952 | */ |
| 2953 | private static function materialiseBytes(string $bytes): ?string |
| 2954 | { |
| 2955 | $tmpPath = tempnam(sys_get_temp_dir(), 'svg-img-'); |
| 2956 | if ($tmpPath === false) { |
| 2957 | return null; |
| 2958 | } |
| 2959 | try { |
| 2960 | LocalFilesystem::writeFile($tmpPath, $bytes); |
| 2961 | return $tmpPath; |
| 2962 | } catch (\Throwable) { |
| 2963 | @unlink($tmpPath); |
| 2964 | return null; |
| 2965 | } |
| 2966 | } |
| 2967 | |
| 2968 | /** |
| 2969 | * 4F.1 — fetch an `http(s)://` `<image>` href through the |
| 2970 | * injected ResourceLoader. Returns the response bytes on success |
| 2971 | * or null on any failure (SSRF policy violation, network error, |
| 2972 | * non-2xx, body cap exceeded) — all of which surface as the SVG 2 |
| 2973 | * §12.6 "no image available" outcome. |
| 2974 | */ |
| 2975 | private function fetchHttpHref(string $href): ?string |
| 2976 | { |
| 2977 | if ($this->resourceLoader === null) { |
| 2978 | return null; |
| 2979 | } |
| 2980 | try { |
| 2981 | $result = $this->resourceLoader->fetch($href); |
| 2982 | } catch (SsrfBlockedException | FetchFailedException) { |
| 2983 | return null; |
| 2984 | } |
| 2985 | return $result->bytes; |
| 2986 | } |
| 2987 | |
| 2988 | private function paintTextElement(TextElement $text, ContentStream $stream): void |
| 2989 | { |
| 2990 | // Without writer + page references the resolver can't register a |
| 2991 | // font, so the text silently drops. Matches the same standalone |
| 2992 | // posture the gradient painter uses at 3O. |
| 2993 | if ($this->fontResolver === null) { |
| 2994 | return; |
| 2995 | } |
| 2996 | $content = self::collectTextContent($text); |
| 2997 | if ($content === '') { |
| 2998 | return; |
| 2999 | } |
| 3000 | // CSS Text 3 §2.1 — SVG 2 §11 delegates text styling to CSS |
| 3001 | // wholesale, so `text-transform` applies to `<text>` and has to |
| 3002 | // run before shaping. |
| 3003 | $content = TextTransform::apply($content, $text->textTransform()); |
| 3004 | |
| 3005 | // SVG 2 default fill for `<text>` is black; the existing |
| 3006 | // applyFillPaint path covers that, but we apply it *before* |
| 3007 | // entering the text object so the colour persists across the |
| 3008 | // Tj sequence (PDF text objects share the page graphics state). |
| 3009 | $fill = $text->fill(); |
| 3010 | if (!($fill instanceof None_)) { |
| 3011 | $this->applyFillPaint($fill, $text, $stream); |
| 3012 | } |
| 3013 | |
| 3014 | $families = $text->fontFamily(); |
| 3015 | $weight = $text->fontWeight(); |
| 3016 | $style = $text->fontStyle(); |
| 3017 | // SVG 2 §11.5 delegates font selection to CSS Fonts 4 wholesale, |
| 3018 | // so `<text>` inside an HTML document must select from the same |
| 3019 | // face set as the surrounding HTML - `@font-face` families |
| 3020 | // included. The embedding document offers those through the |
| 3021 | // provider; only when it has nothing for this family stack do we |
| 3022 | // fall back to the standard-14 mapping. |
| 3023 | $document = $this->documentFontProvider?->resolveDocumentFont($families, $weight, $style); |
| 3024 | $font = $document ?? new DocumentFont($this->fontResolver->resolve($families, $weight, $style)); |
| 3025 | $this->activeFont = $font; |
| 3026 | $size = $text->fontSize() ?? 16.0; |
| 3027 | |
| 3028 | // SVG 2 §11.6 list-valued positioning. `<text x="10 20 30">ABC</text>` |
| 3029 | // positions each glyph individually. When any list has > 1 entry |
| 3030 | // the painter walks character-by-character; otherwise it falls |
| 3031 | // through to the cheaper single-Tj path. Single-value rotate |
| 3032 | // also takes the per-glyph code path so the rotation lands in |
| 3033 | // the text matrix. |
| 3034 | $xList = $text->x(); |
| 3035 | $yList = $text->y(); |
| 3036 | $dxList = $text->dx(); |
| 3037 | $dyList = $text->dy(); |
| 3038 | $rotateList = $text->rotate(); |
| 3039 | $perGlyph = count($xList) > 1 |
| 3040 | || count($yList) > 1 |
| 3041 | || $dxList !== [] |
| 3042 | || $dyList !== [] |
| 3043 | || $rotateList !== []; |
| 3044 | |
| 3045 | // CSS Text Decoration 4 §6 — paint text-shadow layers BEHIND |
| 3046 | // the real text. Each layer is a sharp-offset copy of the |
| 3047 | // glyph run in the shadow colour. Blur-radius is parsed but |
| 3048 | // not currently rasterised (matches the html-to-pdf path, |
| 3049 | // which also ignores blur). The first listed shadow paints on |
| 3050 | // top of later shadows, so we reverse for back-to-front order. |
| 3051 | // Per-glyph positioning is intentionally NOT shadowed at v1 - |
| 3052 | // the WPT corpus only exercises single-position <text> with |
| 3053 | // shadows, and per-glyph shadows would compound complexity |
| 3054 | // without coverage to validate them. |
| 3055 | if (!$perGlyph) { |
| 3056 | $fillFallback = $fill instanceof SolidColor ? $fill->color : null; |
| 3057 | $shadows = self::parseTextShadow($text->textShadow(), $fillFallback); |
| 3058 | foreach (array_reverse($shadows) as $shadow) { |
| 3059 | $stream->saveGraphicsState(); |
| 3060 | $this->setFillColor($stream, $shadow['color']); |
| 3061 | $stream->beginText()->setFont($font->font, $size); |
| 3062 | $sx = ($xList[0] ?? 0.0) + $shadow['offsetX']; |
| 3063 | $sy = ($yList[0] ?? 0.0) + $shadow['offsetY']; |
| 3064 | if ($this->compensateTextFlip) { |
| 3065 | $stream->setTextMatrix(1.0, 0.0, 0.0, -1.0, $sx, $sy); |
| 3066 | } else { |
| 3067 | $stream->moveTextPosition($sx, $sy); |
| 3068 | } |
| 3069 | $this->showTextRun($stream, $content); |
| 3070 | $stream->endText(); |
| 3071 | $stream->restoreGraphicsState(); |
| 3072 | } |
| 3073 | } |
| 3074 | |
| 3075 | $stream->beginText()->setFont($font->font, $size); |
| 3076 | if (!$perGlyph) { |
| 3077 | $x = $xList[0] ?? 0.0; |
| 3078 | $y = $yList[0] ?? 0.0; |
| 3079 | if ($this->compensateTextFlip) { |
| 3080 | // Under an outer Y-flip CTM (`SvgRenderer::draw` applies |
| 3081 | // one), `Td` would render glyphs upside-down. Setting Tm |
| 3082 | // with `d = -1` flips text space so the combined |
| 3083 | // `Tm · CTM` cancels the outer flip and glyphs render |
| 3084 | // upright at the SVG-stated baseline. |
| 3085 | $stream->setTextMatrix(1.0, 0.0, 0.0, -1.0, $x, $y); |
| 3086 | } else { |
| 3087 | $stream->moveTextPosition($x, $y); |
| 3088 | } |
| 3089 | $this->showTextRun($stream, $content); |
| 3090 | } else { |
| 3091 | $this->paintTextPerGlyph($content, $xList, $yList, $dxList, $dyList, $rotateList, $stream); |
| 3092 | } |
| 3093 | $stream->endText(); |
| 3094 | } |
| 3095 | |
| 3096 | /** |
| 3097 | * Emit one `Tj` for `$text` against {@see $activeFont}. |
| 3098 | * |
| 3099 | * Composite (Type 0 / CID) fonts - the shape every embedded |
| 3100 | * `@font-face` takes - carry no single-byte text encoder, so |
| 3101 | * `showText()` would pass UTF-8 bytes straight through and the |
| 3102 | * viewer would read them as raw CIDs. Those go through |
| 3103 | * `showUnicodeText()` with the post-subset GID map instead. The |
| 3104 | * standard-14 Type 1 fonts keep the plain `showText()` path, where |
| 3105 | * the font handle's encoder does the UTF-8 -> byte translation. |
| 3106 | */ |
| 3107 | private function showTextRun(ContentStream $stream, string $text): void |
| 3108 | { |
| 3109 | $font = $this->activeFont; |
| 3110 | if ($font !== null && $font->unicodeToGid !== []) { |
| 3111 | $stream->showUnicodeText($text, $font->unicodeToGid); |
| 3112 | return; |
| 3113 | } |
| 3114 | $stream->showText($text); |
| 3115 | } |
| 3116 | |
| 3117 | /** |
| 3118 | * Parse the raw CSS `text-shadow` value into renderable shadow |
| 3119 | * layers per CSS Text Decoration 4 §6. |
| 3120 | * |
| 3121 | * Grammar: |
| 3122 | * |
| 3123 | * <text-shadow> = none | <shadow># (comma-separated layers) |
| 3124 | * <shadow> = <length>{2,3} <color>? |
| 3125 | * |
| 3126 | * The two lengths are offset-x and offset-y; the optional third |
| 3127 | * is blur-radius (parsed and validated as non-negative, but the |
| 3128 | * painter does not currently rasterise blur — same posture as |
| 3129 | * the html-to-pdf path's `collectTextShadowLayers`). When a layer |
| 3130 | * omits the colour, it falls back to `$fillFallback` (the text's |
| 3131 | * own fill colour) and finally to opaque black. |
| 3132 | * |
| 3133 | * Returns an empty list for `null` input, `none`, or any layer |
| 3134 | * that fails to parse - SVG 2's "invalid → ignored" semantics |
| 3135 | * applied per-shadow keeps a malformed shadow from poisoning |
| 3136 | * earlier valid ones. |
| 3137 | * |
| 3138 | * @return list<array{offsetX: float, offsetY: float, color: ColorInterface}> |
| 3139 | */ |
| 3140 | private static function parseTextShadow(?string $raw, ?ColorInterface $fillFallback): array |
| 3141 | { |
| 3142 | if ($raw === null) { |
| 3143 | return []; |
| 3144 | } |
| 3145 | $items = self::splitTextShadowItems($raw); |
| 3146 | $layers = []; |
| 3147 | foreach ($items as $item) { |
| 3148 | $layer = self::parseTextShadowLayer($item, $fillFallback); |
| 3149 | if ($layer !== null) { |
| 3150 | $layers[] = $layer; |
| 3151 | } |
| 3152 | } |
| 3153 | return $layers; |
| 3154 | } |
| 3155 | |
| 3156 | /** |
| 3157 | * Split a `text-shadow` value on top-level commas, preserving |
| 3158 | * commas inside `rgb(...)` / `rgba(...)` / `hsl(...)` etc. |
| 3159 | * |
| 3160 | * @return list<string> |
| 3161 | */ |
| 3162 | private static function splitTextShadowItems(string $raw): array |
| 3163 | { |
| 3164 | $items = []; |
| 3165 | $depth = 0; |
| 3166 | $buffer = ''; |
| 3167 | $length = strlen($raw); |
| 3168 | for ($i = 0; $i < $length; $i++) { |
| 3169 | $ch = $raw[$i]; |
| 3170 | if ($ch === '(') { |
| 3171 | $depth++; |
| 3172 | } elseif ($ch === ')') { |
| 3173 | $depth = max(0, $depth - 1); |
| 3174 | } |
| 3175 | if ($ch === ',' && $depth === 0) { |
| 3176 | $items[] = $buffer; |
| 3177 | $buffer = ''; |
| 3178 | continue; |
| 3179 | } |
| 3180 | $buffer .= $ch; |
| 3181 | } |
| 3182 | if (trim($buffer) !== '') { |
| 3183 | $items[] = $buffer; |
| 3184 | } |
| 3185 | return array_values(array_filter(array_map('trim', $items), static fn($s) => $s !== '')); |
| 3186 | } |
| 3187 | |
| 3188 | /** |
| 3189 | * Parse a single shadow layer. Returns null on any structural |
| 3190 | * malformation (fewer than two lengths, blur < 0, more than three |
| 3191 | * lengths, unparseable colour token). |
| 3192 | * |
| 3193 | * @return array{offsetX: float, offsetY: float, color: ColorInterface}|null |
| 3194 | */ |
| 3195 | private static function parseTextShadowLayer(string $raw, ?ColorInterface $fillFallback): ?array |
| 3196 | { |
| 3197 | // Tokenise on whitespace, but keep `rgb(1, 2, 3)` etc. as a |
| 3198 | // single token. Lengths are simple; the colour may contain |
| 3199 | // spaces inside its parens. |
| 3200 | $tokens = self::tokenizeTextShadowLayer($raw); |
| 3201 | if ($tokens === []) { |
| 3202 | return null; |
| 3203 | } |
| 3204 | $lengths = []; |
| 3205 | $colorRaw = null; |
| 3206 | foreach ($tokens as $token) { |
| 3207 | $length = self::parseLengthToken($token); |
| 3208 | if ($length !== null) { |
| 3209 | if (count($lengths) >= 3) { |
| 3210 | return null; |
| 3211 | } |
| 3212 | $lengths[] = $length; |
| 3213 | continue; |
| 3214 | } |
| 3215 | if ($colorRaw !== null) { |
| 3216 | return null; |
| 3217 | } |
| 3218 | $colorRaw = $token; |
| 3219 | } |
| 3220 | if (count($lengths) < 2) { |
| 3221 | return null; |
| 3222 | } |
| 3223 | if (count($lengths) === 3 && $lengths[2] < 0.0) { |
| 3224 | // CSS Text Decoration 4: blur-radius must be non-negative. |
| 3225 | return null; |
| 3226 | } |
| 3227 | $color = null; |
| 3228 | if ($colorRaw !== null) { |
| 3229 | $color = SvgColor::parse($colorRaw); |
| 3230 | if ($color === null) { |
| 3231 | return null; |
| 3232 | } |
| 3233 | } else { |
| 3234 | $color = $fillFallback ?? new RgbColor(0.0, 0.0, 0.0); |
| 3235 | } |
| 3236 | return [ |
| 3237 | 'offsetX' => $lengths[0], |
| 3238 | 'offsetY' => $lengths[1], |
| 3239 | 'color' => $color, |
| 3240 | ]; |
| 3241 | } |
| 3242 | |
| 3243 | /** |
| 3244 | * Whitespace-tokenise a single shadow layer keeping function |
| 3245 | * forms (`rgb(0, 128, 0)`) as one token. |
| 3246 | * |
| 3247 | * @return list<string> |
| 3248 | */ |
| 3249 | private static function tokenizeTextShadowLayer(string $raw): array |
| 3250 | { |
| 3251 | $tokens = []; |
| 3252 | $buffer = ''; |
| 3253 | $depth = 0; |
| 3254 | $length = strlen($raw); |
| 3255 | for ($i = 0; $i < $length; $i++) { |
| 3256 | $ch = $raw[$i]; |
| 3257 | if ($ch === '(') { |
| 3258 | $depth++; |
| 3259 | $buffer .= $ch; |
| 3260 | continue; |
| 3261 | } |
| 3262 | if ($ch === ')') { |
| 3263 | $depth = max(0, $depth - 1); |
| 3264 | $buffer .= $ch; |
| 3265 | continue; |
| 3266 | } |
| 3267 | if ($depth === 0 && (ctype_space($ch) || $ch === ',')) { |
| 3268 | if ($buffer !== '') { |
| 3269 | $tokens[] = $buffer; |
| 3270 | $buffer = ''; |
| 3271 | } |
| 3272 | continue; |
| 3273 | } |
| 3274 | $buffer .= $ch; |
| 3275 | } |
| 3276 | if ($buffer !== '') { |
| 3277 | $tokens[] = $buffer; |
| 3278 | } |
| 3279 | return $tokens; |
| 3280 | } |
| 3281 | |
| 3282 | /** |
| 3283 | * Parse a CSS length token used inside `text-shadow`. Supports |
| 3284 | * unitless (`0`), `px`, `pt`, `em`, and a couple of absolute |
| 3285 | * physical units. Returns null when the token doesn't look like |
| 3286 | * a length so the caller treats it as the colour slot instead. |
| 3287 | * Unit support is intentionally narrow - text-shadow in real |
| 3288 | * documents almost always uses `px` (or `0`). |
| 3289 | */ |
| 3290 | private static function parseLengthToken(string $raw): ?float |
| 3291 | { |
| 3292 | $trimmed = trim($raw); |
| 3293 | if ($trimmed === '') { |
| 3294 | return null; |
| 3295 | } |
| 3296 | if (preg_match('/^([+-]?(?:\d+\.?\d*|\.\d+))([a-zA-Z%]*)$/', $trimmed, $m) !== 1) { |
| 3297 | return null; |
| 3298 | } |
| 3299 | $value = (float) $m[1]; |
| 3300 | $unit = strtolower($m[2]); |
| 3301 | return match ($unit) { |
| 3302 | '', 'px', 'pt' => $value, |
| 3303 | 'in' => $value * 72.0, |
| 3304 | 'cm' => $value * (72.0 / 2.54), |
| 3305 | 'mm' => $value * (72.0 / 25.4), |
| 3306 | // em / rem / vw / vh / % aren't resolvable without a |
| 3307 | // containing context — reject so an unknown unit doesn't |
| 3308 | // silently land at 0. |
| 3309 | default => null, |
| 3310 | }; |
| 3311 | } |
| 3312 | |
| 3313 | /** |
| 3314 | * Per-glyph positioning per SVG 2 §11.6: walk content character-by- |
| 3315 | * character, emit one `Tm` per explicitly-positioned glyph, then |
| 3316 | * batch the remaining characters as a single `Tj` so their natural |
| 3317 | * advance handles the trailing positioning. |
| 3318 | * |
| 3319 | * Sticky semantics: when a glyph specifies `x[i]` but not `y[i]` |
| 3320 | * (or vice-versa), the unspecified component carries over from the |
| 3321 | * previous glyph's position. SVG 2 actually defines this as "the |
| 3322 | * previous glyph's effective position" which requires knowing the |
| 3323 | * per-glyph advance — we don't have font metrics here at 3R+5, so |
| 3324 | * we use the last explicit value instead. The result is correct |
| 3325 | * for the common case where `x` and `y` have matching lengths. |
| 3326 | * |
| 3327 | * `dx[i]` / `dy[i]` are additive deltas applied to the resolved |
| 3328 | * `(stickyX, stickyY)` — SVG 2 §11.6 specifies them as relative |
| 3329 | * offsets from the glyph's natural position. Without font metrics |
| 3330 | * "natural position" collapses to "sticky position", so we treat |
| 3331 | * dx/dy as deltas from sticky. The deltas accumulate into sticky |
| 3332 | * so subsequent glyphs without their own dx/dy inherit the shift, |
| 3333 | * matching the common renderer behaviour for stacked offsets like |
| 3334 | * super/subscript adjustments. |
| 3335 | * |
| 3336 | * @param list<float> $xList |
| 3337 | * @param list<float> $yList |
| 3338 | * @param list<float> $dxList |
| 3339 | * @param list<float> $dyList |
| 3340 | * @param list<float> $rotateList |
| 3341 | */ |
| 3342 | private function paintTextPerGlyph( |
| 3343 | string $content, |
| 3344 | array $xList, |
| 3345 | array $yList, |
| 3346 | array $dxList, |
| 3347 | array $dyList, |
| 3348 | array $rotateList, |
| 3349 | ContentStream $stream, |
| 3350 | ): void { |
| 3351 | $chars = mb_str_split($content); |
| 3352 | if ($chars === []) { |
| 3353 | return; |
| 3354 | } |
| 3355 | $explicitCount = max( |
| 3356 | count($xList), |
| 3357 | count($yList), |
| 3358 | count($dxList), |
| 3359 | count($dyList), |
| 3360 | count($rotateList), |
| 3361 | ); |
| 3362 | $stickyX = $xList[0] ?? 0.0; |
| 3363 | $stickyY = $yList[0] ?? 0.0; |
| 3364 | $stickyRotate = $rotateList[0] ?? 0.0; |
| 3365 | |
| 3366 | $emitted = 0; |
| 3367 | foreach ($chars as $i => $char) { |
| 3368 | if ($i >= $explicitCount) { |
| 3369 | break; |
| 3370 | } |
| 3371 | $stickyX = $xList[$i] ?? $stickyX; |
| 3372 | $stickyY = $yList[$i] ?? $stickyY; |
| 3373 | $stickyRotate = $rotateList[$i] ?? $stickyRotate; |
| 3374 | if (isset($dxList[$i])) { |
| 3375 | $stickyX += $dxList[$i]; |
| 3376 | } |
| 3377 | if (isset($dyList[$i])) { |
| 3378 | $stickyY += $dyList[$i]; |
| 3379 | } |
| 3380 | |
| 3381 | $this->emitTextMatrix($stickyX, $stickyY, $stickyRotate, $stream); |
| 3382 | $this->showTextRun($stream, $char); |
| 3383 | $emitted++; |
| 3384 | } |
| 3385 | if ($emitted < count($chars)) { |
| 3386 | // Remaining glyphs ride the auto-advance from the last |
| 3387 | // positioned glyph — emit them as a single `Tj` so the |
| 3388 | // PDF reader inter-glyph kerning still applies. |
| 3389 | $this->showTextRun($stream, implode('', array_slice($chars, $emitted))); |
| 3390 | } |
| 3391 | } |
| 3392 | |
| 3393 | /** |
| 3394 | * Set the text matrix for a single positioned glyph. Combines the |
| 3395 | * per-glyph rotation with the optional outer-flip compensation |
| 3396 | * established by `SvgRenderer::draw`. Algebra: |
| 3397 | * |
| 3398 | * Without flip: Tm = T(x,y) · R(θ) = [cosθ sinθ -sinθ cosθ x y] |
| 3399 | * With flip: Tm = T(x,y) · F · R(θ) = [cosθ sinθ sinθ -cosθ x y] |
| 3400 | * |
| 3401 | * where `F = [1 0 0 -1 0 0]` is the y-axis flip. |
| 3402 | */ |
| 3403 | private function emitTextMatrix(float $x, float $y, float $rotateDegrees, ContentStream $stream): void |
| 3404 | { |
| 3405 | $rad = deg2rad($rotateDegrees); |
| 3406 | $cos = cos($rad); |
| 3407 | $sin = sin($rad); |
| 3408 | if ($this->compensateTextFlip) { |
| 3409 | $stream->setTextMatrix($cos, $sin, $sin, -$cos, $x, $y); |
| 3410 | } else { |
| 3411 | $stream->setTextMatrix($cos, $sin, -$sin, $cos, $x, $y); |
| 3412 | } |
| 3413 | } |
| 3414 | |
| 3415 | /** |
| 3416 | * Concatenate all `Phpdftk\Svg\Text` (data) descendants in document |
| 3417 | * order. SVG 2's whitespace handling is complex (xml:space="preserve" |
| 3418 | * vs the default collapse); 3P keeps things simple by emitting the |
| 3419 | * source bytes verbatim and leaving whitespace policy to the future |
| 3420 | * cascade-aware text painter. |
| 3421 | */ |
| 3422 | private static function collectTextContent(Element $element): string |
| 3423 | { |
| 3424 | $out = ''; |
| 3425 | foreach ($element->children as $child) { |
| 3426 | if ($child instanceof TextNode) { |
| 3427 | $out .= $child->data; |
| 3428 | continue; |
| 3429 | } |
| 3430 | if ($child instanceof Element) { |
| 3431 | $out .= self::collectTextContent($child); |
| 3432 | } |
| 3433 | } |
| 3434 | return $out; |
| 3435 | } |
| 3436 | |
| 3437 | private function paintPath(Path $path, ContentStream $stream): void |
| 3438 | { |
| 3439 | $commands = $path->d()->commands; |
| 3440 | if ($commands === []) { |
| 3441 | return; |
| 3442 | } |
| 3443 | $state = new PathPainterState(); |
| 3444 | foreach ($commands as $command) { |
| 3445 | $this->emitPathCommand($command, $stream, $state); |
| 3446 | } |
| 3447 | $this->applyFillAndStroke($path, $stream); |
| 3448 | $this->paintMarkers($path, MarkerVertices::ofPathData($path->d()), $stream); |
| 3449 | } |
| 3450 | |
| 3451 | private function emitPathCommand( |
| 3452 | PathCommand $command, |
| 3453 | ContentStream $stream, |
| 3454 | PathPainterState $state, |
| 3455 | ): void { |
| 3456 | match (true) { |
| 3457 | $command instanceof MoveTo => $this->emitMoveTo($command, $stream, $state), |
| 3458 | $command instanceof LineTo => $this->emitLineTo($command, $stream, $state), |
| 3459 | $command instanceof HorizontalLineTo => $this->emitHorizontalLineTo($command, $stream, $state), |
| 3460 | $command instanceof VerticalLineTo => $this->emitVerticalLineTo($command, $stream, $state), |
| 3461 | $command instanceof CurveTo => $this->emitCurveTo($command, $stream, $state), |
| 3462 | $command instanceof SmoothCurveTo => $this->emitSmoothCurveTo($command, $stream, $state), |
| 3463 | $command instanceof QuadraticCurveTo => $this->emitQuadraticCurveTo($command, $stream, $state), |
| 3464 | $command instanceof SmoothQuadraticCurveTo => $this->emitSmoothQuadraticCurveTo($command, $stream, $state), |
| 3465 | $command instanceof ArcTo => $this->emitArcTo($command, $stream, $state), |
| 3466 | $command instanceof ClosePath => $this->emitClosePath($stream, $state), |
| 3467 | // Sealed-via-convention: 3rd-party impls of `PathCommand` are |
| 3468 | // not part of the SVG spec, so we no-op silently rather than |
| 3469 | // throw — same posture the parser uses for unknown content. |
| 3470 | default => null, |
| 3471 | }; |
| 3472 | } |
| 3473 | |
| 3474 | private function emitMoveTo(MoveTo $cmd, ContentStream $stream, PathPainterState $state): void |
| 3475 | { |
| 3476 | [$x, $y] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3477 | $stream->moveTo($x, $y); |
| 3478 | $state->moveTo($x, $y); |
| 3479 | } |
| 3480 | |
| 3481 | private function emitLineTo(LineTo $cmd, ContentStream $stream, PathPainterState $state): void |
| 3482 | { |
| 3483 | [$x, $y] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3484 | $stream->lineTo($x, $y); |
| 3485 | $state->lineTo($x, $y); |
| 3486 | } |
| 3487 | |
| 3488 | private function emitHorizontalLineTo( |
| 3489 | HorizontalLineTo $cmd, |
| 3490 | ContentStream $stream, |
| 3491 | PathPainterState $state, |
| 3492 | ): void { |
| 3493 | $x = $cmd->absolute ? $cmd->x : $state->currentX + $cmd->x; |
| 3494 | $stream->lineTo($x, $state->currentY); |
| 3495 | $state->lineTo($x, $state->currentY); |
| 3496 | } |
| 3497 | |
| 3498 | private function emitVerticalLineTo( |
| 3499 | VerticalLineTo $cmd, |
| 3500 | ContentStream $stream, |
| 3501 | PathPainterState $state, |
| 3502 | ): void { |
| 3503 | $y = $cmd->absolute ? $cmd->y : $state->currentY + $cmd->y; |
| 3504 | $stream->lineTo($state->currentX, $y); |
| 3505 | $state->lineTo($state->currentX, $y); |
| 3506 | } |
| 3507 | |
| 3508 | private function emitCurveTo(CurveTo $cmd, ContentStream $stream, PathPainterState $state): void |
| 3509 | { |
| 3510 | [$x1, $y1] = $this->resolvePoint($cmd->x1, $cmd->y1, $cmd->absolute, $state); |
| 3511 | [$x2, $y2] = $this->resolvePoint($cmd->x2, $cmd->y2, $cmd->absolute, $state); |
| 3512 | [$x, $y] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3513 | $stream->curveTo($x1, $y1, $x2, $y2, $x, $y); |
| 3514 | $state->currentX = $x; |
| 3515 | $state->currentY = $y; |
| 3516 | $state->recordCubicControl($x2, $y2); |
| 3517 | } |
| 3518 | |
| 3519 | private function emitSmoothCurveTo( |
| 3520 | SmoothCurveTo $cmd, |
| 3521 | ContentStream $stream, |
| 3522 | PathPainterState $state, |
| 3523 | ): void { |
| 3524 | [$x1, $y1] = $state->reflectedCubicControl(); |
| 3525 | [$x2, $y2] = $this->resolvePoint($cmd->x2, $cmd->y2, $cmd->absolute, $state); |
| 3526 | [$x, $y] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3527 | $stream->curveTo($x1, $y1, $x2, $y2, $x, $y); |
| 3528 | $state->currentX = $x; |
| 3529 | $state->currentY = $y; |
| 3530 | $state->recordCubicControl($x2, $y2); |
| 3531 | } |
| 3532 | |
| 3533 | /** |
| 3534 | * PDF has no native quadratic curve operator. Lift to cubic via the |
| 3535 | * standard `C1 = P0 + 2/3·(P1-P0)`, `C2 = P2 + 2/3·(P1-P2)` formula — |
| 3536 | * mathematically exact, no approximation error. |
| 3537 | */ |
| 3538 | private function emitQuadraticCurveTo( |
| 3539 | QuadraticCurveTo $cmd, |
| 3540 | ContentStream $stream, |
| 3541 | PathPainterState $state, |
| 3542 | ): void { |
| 3543 | [$qx, $qy] = $this->resolvePoint($cmd->x1, $cmd->y1, $cmd->absolute, $state); |
| 3544 | [$ex, $ey] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3545 | $this->emitQuadraticAsCubic($state->currentX, $state->currentY, $qx, $qy, $ex, $ey, $stream); |
| 3546 | $state->currentX = $ex; |
| 3547 | $state->currentY = $ey; |
| 3548 | $state->recordQuadraticControl($qx, $qy); |
| 3549 | } |
| 3550 | |
| 3551 | private function emitSmoothQuadraticCurveTo( |
| 3552 | SmoothQuadraticCurveTo $cmd, |
| 3553 | ContentStream $stream, |
| 3554 | PathPainterState $state, |
| 3555 | ): void { |
| 3556 | [$qx, $qy] = $state->reflectedQuadraticControl(); |
| 3557 | [$ex, $ey] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3558 | $this->emitQuadraticAsCubic($state->currentX, $state->currentY, $qx, $qy, $ex, $ey, $stream); |
| 3559 | $state->currentX = $ex; |
| 3560 | $state->currentY = $ey; |
| 3561 | $state->recordQuadraticControl($qx, $qy); |
| 3562 | } |
| 3563 | |
| 3564 | private function emitArcTo(ArcTo $cmd, ContentStream $stream, PathPainterState $state): void |
| 3565 | { |
| 3566 | [$endX, $endY] = $this->resolvePoint($cmd->x, $cmd->y, $cmd->absolute, $state); |
| 3567 | $segments = ArcToCubic::convert( |
| 3568 | $state->currentX, |
| 3569 | $state->currentY, |
| 3570 | $cmd->rx, |
| 3571 | $cmd->ry, |
| 3572 | $cmd->xAxisRotation, |
| 3573 | $cmd->largeArc, |
| 3574 | $cmd->sweep, |
| 3575 | $endX, |
| 3576 | $endY, |
| 3577 | ); |
| 3578 | if ($segments === []) { |
| 3579 | // Degenerate: zero-length or zero-radius. Per SVG 2 §9.5.1, |
| 3580 | // an arc with a zero radius is rendered as a straight line. |
| 3581 | if ($cmd->rx === 0.0 || $cmd->ry === 0.0) { |
| 3582 | $stream->lineTo($endX, $endY); |
| 3583 | $state->lineTo($endX, $endY); |
| 3584 | } |
| 3585 | return; |
| 3586 | } |
| 3587 | foreach ($segments as $segment) { |
| 3588 | $stream->curveTo( |
| 3589 | $segment['x1'], |
| 3590 | $segment['y1'], |
| 3591 | $segment['x2'], |
| 3592 | $segment['y2'], |
| 3593 | $segment['x'], |
| 3594 | $segment['y'], |
| 3595 | ); |
| 3596 | } |
| 3597 | $state->currentX = $endX; |
| 3598 | $state->currentY = $endY; |
| 3599 | $state->clearControlPoints(); |
| 3600 | } |
| 3601 | |
| 3602 | private function emitClosePath(ContentStream $stream, PathPainterState $state): void |
| 3603 | { |
| 3604 | $stream->closePath(); |
| 3605 | $state->closeSubpath(); |
| 3606 | } |
| 3607 | |
| 3608 | private function emitQuadraticAsCubic( |
| 3609 | float $p0x, |
| 3610 | float $p0y, |
| 3611 | float $p1x, |
| 3612 | float $p1y, |
| 3613 | float $p2x, |
| 3614 | float $p2y, |
| 3615 | ContentStream $stream, |
| 3616 | ): void { |
| 3617 | $twoThirds = 2.0 / 3.0; |
| 3618 | $c1x = $p0x + $twoThirds * ($p1x - $p0x); |
| 3619 | $c1y = $p0y + $twoThirds * ($p1y - $p0y); |
| 3620 | $c2x = $p2x + $twoThirds * ($p1x - $p2x); |
| 3621 | $c2y = $p2y + $twoThirds * ($p1y - $p2y); |
| 3622 | $stream->curveTo($c1x, $c1y, $c2x, $c2y, $p2x, $p2y); |
| 3623 | } |
| 3624 | |
| 3625 | /** |
| 3626 | * @return array{float, float} |
| 3627 | */ |
| 3628 | private function resolvePoint(float $x, float $y, bool $absolute, PathPainterState $state): array |
| 3629 | { |
| 3630 | if ($absolute) { |
| 3631 | return [$x, $y]; |
| 3632 | } |
| 3633 | return [$state->currentX + $x, $state->currentY + $y]; |
| 3634 | } |
| 3635 | |
| 3636 | // The paint* entry points below share their geometry with the |
| 3637 | // emit*Path methods the clip-region builder uses. Keeping ONE |
| 3638 | // resolver per shape is what makes SVG 2 §10.1 geometry (CSS- |
| 3639 | // declared `cx` / `r` / `width` / …) reach BOTH the painter and |
| 3640 | // `clip-path`; the two used to compute coordinates separately and |
| 3641 | // only the clip side was ever taught about the cascade. |
| 3642 | |
| 3643 | private function paintRect(Rect $rect, ContentStream $stream): void |
| 3644 | { |
| 3645 | if (!$this->emitRectPath($rect, $stream)) { |
| 3646 | return; |
| 3647 | } |
| 3648 | $this->applyFillAndStroke($rect, $stream); |
| 3649 | } |
| 3650 | |
| 3651 | private function paintCircle(Circle $circle, ContentStream $stream): void |
| 3652 | { |
| 3653 | if (!$this->emitCirclePath($circle, $stream)) { |
| 3654 | return; |
| 3655 | } |
| 3656 | $this->applyFillAndStroke($circle, $stream); |
| 3657 | } |
| 3658 | |
| 3659 | private function paintEllipse(Ellipse $ellipse, ContentStream $stream): void |
| 3660 | { |
| 3661 | if (!$this->emitEllipsePathFor($ellipse, $stream)) { |
| 3662 | return; |
| 3663 | } |
| 3664 | $this->applyFillAndStroke($ellipse, $stream); |
| 3665 | } |
| 3666 | |
| 3667 | private function paintLine(Line $line, ContentStream $stream): void |
| 3668 | { |
| 3669 | // Lines never enclose an area; only stroke is meaningful. Skip |
| 3670 | // entirely when stroke resolves to no paint — emitting a stroke |
| 3671 | // op with no colour would otherwise draw a black line by |
| 3672 | // accident. |
| 3673 | $stroke = $line->stroke(); |
| 3674 | if ($stroke !== null |
| 3675 | && !$stroke instanceof None_ |
| 3676 | && $this->applyStrokePaint($stroke, $line, $stream) |
| 3677 | ) { |
| 3678 | $stream->moveTo($line->x1(), $line->y1()) |
| 3679 | ->lineTo($line->x2(), $line->y2()) |
| 3680 | ->stroke(); |
| 3681 | } |
| 3682 | // SVG 2 §11.6.1 — markers are a paint channel of their own. |
| 3683 | // A `<line>` with no stroke still places them, so this sits |
| 3684 | // outside the stroke guard above. |
| 3685 | $this->paintMarkers( |
| 3686 | $line, |
| 3687 | MarkerVertices::ofPoints( |
| 3688 | [[$line->x1(), $line->y1()], [$line->x2(), $line->y2()]], |
| 3689 | closed: false, |
| 3690 | ), |
| 3691 | $stream, |
| 3692 | ); |
| 3693 | } |
| 3694 | |
| 3695 | private function paintPolyline(Polyline $polyline, ContentStream $stream): void |
| 3696 | { |
| 3697 | $points = $polyline->points(); |
| 3698 | if (count($points) < 2) { |
| 3699 | return; |
| 3700 | } |
| 3701 | $this->emitPolyPath($stream, $points, closed: false); |
| 3702 | $this->applyFillAndStroke($polyline, $stream); |
| 3703 | $this->paintMarkers($polyline, MarkerVertices::ofPoints($points, closed: false), $stream); |
| 3704 | } |
| 3705 | |
| 3706 | private function paintPolygon(Polygon $polygon, ContentStream $stream): void |
| 3707 | { |
| 3708 | $points = $polygon->points(); |
| 3709 | if (count($points) < 3) { |
| 3710 | return; |
| 3711 | } |
| 3712 | $this->emitPolyPath($stream, $points, closed: true); |
| 3713 | $this->applyFillAndStroke($polygon, $stream); |
| 3714 | $this->paintMarkers($polygon, MarkerVertices::ofPoints($points, closed: true), $stream); |
| 3715 | } |
| 3716 | |
| 3717 | /** |
| 3718 | * Standard 4-cubic-Bézier ellipse approximation. Maximum radial |
| 3719 | * error against the true ellipse is ~0.027 % — well below print |
| 3720 | * resolution for any reasonable PDF size. |
| 3721 | */ |
| 3722 | private function emitEllipsePath( |
| 3723 | ContentStream $stream, |
| 3724 | float $cx, |
| 3725 | float $cy, |
| 3726 | float $rx, |
| 3727 | float $ry, |
| 3728 | ): void { |
| 3729 | $kx = $rx * self::KAPPA; |
| 3730 | $ky = $ry * self::KAPPA; |
| 3731 | $stream |
| 3732 | ->moveTo($cx + $rx, $cy) |
| 3733 | ->curveTo($cx + $rx, $cy + $ky, $cx + $kx, $cy + $ry, $cx, $cy + $ry) |
| 3734 | ->curveTo($cx - $kx, $cy + $ry, $cx - $rx, $cy + $ky, $cx - $rx, $cy) |
| 3735 | ->curveTo($cx - $rx, $cy - $ky, $cx - $kx, $cy - $ry, $cx, $cy - $ry) |
| 3736 | ->curveTo($cx + $kx, $cy - $ry, $cx + $rx, $cy - $ky, $cx + $rx, $cy) |
| 3737 | ->closePath(); |
| 3738 | } |
| 3739 | |
| 3740 | /** |
| 3741 | * @param list<array{float, float}> $points |
| 3742 | */ |
| 3743 | private function emitPolyPath(ContentStream $stream, array $points, bool $closed): void |
| 3744 | { |
| 3745 | $first = $points[0]; |
| 3746 | $stream->moveTo($first[0], $first[1]); |
| 3747 | for ($i = 1, $n = count($points); $i < $n; $i++) { |
| 3748 | $stream->lineTo($points[$i][0], $points[$i][1]); |
| 3749 | } |
| 3750 | if ($closed) { |
| 3751 | $stream->closePath(); |
| 3752 | } |
| 3753 | } |
| 3754 | |
| 3755 | /** |
| 3756 | * Resolve the element's fill and stroke and emit the right PDF |
| 3757 | * paint operator combination. Defaults follow SVG 2 §13.2.1 — black |
| 3758 | * fill, no stroke — so a bare `<rect width=… height=…/>` paints as |
| 3759 | * a filled black rectangle. |
| 3760 | */ |
| 3761 | private function applyFillAndStroke(Element $element, ContentStream $stream): void |
| 3762 | { |
| 3763 | $fill = $element->fill(); |
| 3764 | $stroke = $element->stroke(); |
| 3765 | |
| 3766 | // SVG 2 §13.3 — when `fill` resolves to a `<pattern>`, the pattern |
| 3767 | // tile paints clipped to the shape (replacing the flat-colour |
| 3768 | // fill). Handle it before the plain paint path: the current path |
| 3769 | // just built by the caller is consumed as the clip region. |
| 3770 | $pattern = $this->resolveFillPattern($fill); |
| 3771 | if ($pattern !== null) { |
| 3772 | $this->paintPatternFill($pattern, $element, $stream, $stroke); |
| 3773 | return; |
| 3774 | } |
| 3775 | |
| 3776 | $hasFill = $this->applyFillPaint($fill, $element, $stream); |
| 3777 | $hasStroke = $this->applyStrokePaint($stroke, $element, $stream); |
| 3778 | |
| 3779 | $rule = $element->fillRule() ?? 'nonzero'; |
| 3780 | |
| 3781 | if ($hasFill && $hasStroke) { |
| 3782 | $rule === 'evenodd' ? $stream->fillAndStrokeEvenOdd() : $stream->fillAndStroke(); |
| 3783 | return; |
| 3784 | } |
| 3785 | if ($hasFill) { |
| 3786 | $rule === 'evenodd' ? $stream->fillEvenOdd() : $stream->fill(); |
| 3787 | return; |
| 3788 | } |
| 3789 | if ($hasStroke) { |
| 3790 | $stream->stroke(); |
| 3791 | return; |
| 3792 | } |
| 3793 | // Path constructed but nothing wants to paint it — discard so |
| 3794 | // we don't bake a leftover current-path into the graphics state. |
| 3795 | $stream->endPath(); |
| 3796 | } |
| 3797 | |
| 3798 | /** |
| 3799 | * SVG 2 §11.6 — paint the `marker-start` / `marker-mid` / |
| 3800 | * `marker-end` markers of a shape, at the vertices `$vertices` |
| 3801 | * describes. |
| 3802 | * |
| 3803 | * Markers are a paint channel of their own, drawn AFTER the fill |
| 3804 | * and stroke of the shape that places them and on top of both |
| 3805 | * (§11.6.1). They are painted here inside the referencing element's |
| 3806 | * `q`/`Q` wrap, so they share its user space and its `transform`, |
| 3807 | * which is what puts a marker on a rotated path in the right place |
| 3808 | * without any extra bookkeeping. |
| 3809 | * |
| 3810 | * Marker content does NOT inherit from the referencing element — |
| 3811 | * the `<marker>` subtree carries its own cascade — so nothing here |
| 3812 | * seeds fill or stroke from `$element`. |
| 3813 | * |
| 3814 | * @param list<MarkerVertex> $vertices |
| 3815 | */ |
| 3816 | private function paintMarkers(Element $element, array $vertices, ContentStream $stream): void |
| 3817 | { |
| 3818 | if ($vertices === [] || $this->document === null) { |
| 3819 | return; |
| 3820 | } |
| 3821 | $start = $this->resolveMarker($element->markerStart()); |
| 3822 | $mid = $this->resolveMarker($element->markerMid()); |
| 3823 | $end = $this->resolveMarker($element->markerEnd()); |
| 3824 | if ($start === null && $mid === null && $end === null) { |
| 3825 | return; |
| 3826 | } |
| 3827 | // `markerUnits="strokeWidth"` (the default) scales the marker |
| 3828 | // by the USED stroke width of the shape — which is 1 when the |
| 3829 | // property is absent, per SVG 2 §13.2, not 0. |
| 3830 | // SVG 2 §11.6.2 — `markerUnits="strokeWidth"` scales by the USED |
| 3831 | // stroke width, which `non-scaling-stroke` has already |
| 3832 | // normalised against the transform. |
| 3833 | $strokeWidth = $this->usedStrokeWidth($element) ?? 1.0; |
| 3834 | $context = new ContextElementPaint($element->fill(), $element->stroke()); |
| 3835 | $last = count($vertices) - 1; |
| 3836 | foreach ($vertices as $index => $vertex) { |
| 3837 | // A shape reduced to a single vertex (a lone `moveto`) has |
| 3838 | // an END vertex and no start: there is no segment for a |
| 3839 | // start marker to sit at the beginning of. |
| 3840 | $marker = match (true) { |
| 3841 | $index === 0 && $last > 0 => $start, |
| 3842 | $index === $last => $end, |
| 3843 | default => $mid, |
| 3844 | }; |
| 3845 | if ($marker === null) { |
| 3846 | continue; |
| 3847 | } |
| 3848 | // SVG 2 §11.6.3 — `orient` is either a FIXED angle, which |
| 3849 | // ignores the path entirely, or `auto` / `auto-start-reverse`, |
| 3850 | // which face along it. |
| 3851 | $orient = $marker->orient(); |
| 3852 | $angle = is_float($orient) ? $orient : $vertex->angle(); |
| 3853 | if ($orient === 'auto-start-reverse' && $index === 0 && $last > 0) { |
| 3854 | // `auto-start-reverse` is `auto` everywhere except the |
| 3855 | // start vertex, where the marker is turned to face back |
| 3856 | // down the path. That is what lets one arrowhead |
| 3857 | // definition serve both ends of a line. |
| 3858 | $angle += 180.0; |
| 3859 | } |
| 3860 | $this->paintMarkerInstance($marker, $vertex, $angle, $strokeWidth, $context, $stream); |
| 3861 | } |
| 3862 | } |
| 3863 | |
| 3864 | /** |
| 3865 | * Resolve a `marker-*` property value to the `<marker>` it names. |
| 3866 | * |
| 3867 | * `none`, a malformed value, a reference that misses, and a |
| 3868 | * reference to something that is not a `<marker>` all resolve to |
| 3869 | * "no marker" — SVG 2 §11.6.2 gives the property no fallback |
| 3870 | * syntax, so an unusable reference simply paints nothing. |
| 3871 | */ |
| 3872 | private function resolveMarker(?string $value): ?Marker |
| 3873 | { |
| 3874 | if ($value === null || $this->document === null) { |
| 3875 | return null; |
| 3876 | } |
| 3877 | if (preg_match('/^url\(\s*(["\']?)#([^"\')\s]+)\1\s*\)$/i', trim($value), $m) !== 1) { |
| 3878 | return null; |
| 3879 | } |
| 3880 | $target = $this->document->findByFragment($m[2]); |
| 3881 | return $target instanceof Marker ? $target : null; |
| 3882 | } |
| 3883 | |
| 3884 | /** |
| 3885 | * Paint one marker instance at one vertex. |
| 3886 | * |
| 3887 | * The placement transform is, outermost first (SVG 2 §11.6.3): |
| 3888 | * |
| 3889 | * 1. `translate(vertex)` — put the marker on the vertex. |
| 3890 | * 2. `rotate(angle)` — turn it along the path direction. |
| 3891 | * 3. `scale(strokeWidth)` when `markerUnits="strokeWidth"`. |
| 3892 | * 4. `translate(-refPoint)` — line the marker's reference point |
| 3893 | * up with the vertex, where the reference point is `refX` / |
| 3894 | * `refY` mapped through the `viewBox` transform, because |
| 3895 | * §11.6.3 defines them in the marker CONTENT's coordinate |
| 3896 | * system. |
| 3897 | * |
| 3898 | * What is left after that is the marker viewport: a |
| 3899 | * `markerWidth` x `markerHeight` rectangle at the origin, which |
| 3900 | * clips the content unless `overflow` says otherwise (the UA |
| 3901 | * stylesheet puts `overflow: hidden` on `marker`), and into which |
| 3902 | * a `viewBox` maps under `preserveAspectRatio` exactly as it does |
| 3903 | * for a nested `<svg>`. |
| 3904 | */ |
| 3905 | private function paintMarkerInstance( |
| 3906 | Marker $marker, |
| 3907 | MarkerVertex $vertex, |
| 3908 | float $angle, |
| 3909 | float $strokeWidth, |
| 3910 | ContextElementPaint $context, |
| 3911 | ContentStream $stream, |
| 3912 | ): void { |
| 3913 | $markerWidth = $marker->markerWidth(); |
| 3914 | $markerHeight = $marker->markerHeight(); |
| 3915 | // SVG 2 §11.6.2 — "A value of zero disables rendering of the |
| 3916 | // element", and a negative value is an error that does the |
| 3917 | // same. |
| 3918 | if ($markerWidth <= 0.0 || $markerHeight <= 0.0) { |
| 3919 | return; |
| 3920 | } |
| 3921 | $scale = $marker->markerUnits() === 'strokeWidth' ? $strokeWidth : 1.0; |
| 3922 | if ($scale <= 0.0) { |
| 3923 | return; |
| 3924 | } |
| 3925 | $viewBox = $marker->viewBox(); |
| 3926 | $content = null; |
| 3927 | $refX = $marker->refX(); |
| 3928 | $refY = $marker->refY(); |
| 3929 | if ($viewBox !== null && $viewBox[2] > 0.0 && $viewBox[3] > 0.0) { |
| 3930 | [$scaleX, $scaleY, $offsetX, $offsetY] = $this->nestedViewBoxTransform( |
| 3931 | $marker, |
| 3932 | $viewBox[2], |
| 3933 | $viewBox[3], |
| 3934 | $markerWidth, |
| 3935 | $markerHeight, |
| 3936 | ); |
| 3937 | $content = [ |
| 3938 | $scaleX, |
| 3939 | 0.0, |
| 3940 | 0.0, |
| 3941 | $scaleY, |
| 3942 | $offsetX - $viewBox[0] * $scaleX, |
| 3943 | $offsetY - $viewBox[1] * $scaleY, |
| 3944 | ]; |
| 3945 | $refX = $content[0] * $refX + $content[4]; |
| 3946 | $refY = $content[3] * $refY + $content[5]; |
| 3947 | } |
| 3948 | $radians = deg2rad($angle); |
| 3949 | $cos = cos($radians) * $scale; |
| 3950 | $sin = sin($radians) * $scale; |
| 3951 | $placement = [ |
| 3952 | $cos, |
| 3953 | $sin, |
| 3954 | -$sin, |
| 3955 | $cos, |
| 3956 | $vertex->x - $cos * $refX + $sin * $refY, |
| 3957 | $vertex->y - $sin * $refX - $cos * $refY, |
| 3958 | ]; |
| 3959 | |
| 3960 | $stream->saveGraphicsState(); |
| 3961 | $stream->concatMatrix(...$placement); |
| 3962 | $this->pushMatrix($placement); |
| 3963 | // SVG 2 §13.2.1 — the shape that referenced this marker is the |
| 3964 | // context element for any `context-fill` / `context-stroke` |
| 3965 | // inside it. Saved and restored rather than just set: markers |
| 3966 | // nest (a marker's content can be a shape with markers of its |
| 3967 | // own) and the inner one must not keep the outer's context. |
| 3968 | $outerContext = $this->contextPaint; |
| 3969 | $this->contextPaint = $context; |
| 3970 | if (self::viewportClips($marker)) { |
| 3971 | $stream->rectangle(0.0, 0.0, $markerWidth, $markerHeight); |
| 3972 | $stream->clip()->endPath(); |
| 3973 | } |
| 3974 | $childViewport = ['w' => $markerWidth, 'h' => $markerHeight]; |
| 3975 | if ($content !== null) { |
| 3976 | $stream->concatMatrix(...$content); |
| 3977 | $this->pushMatrix($content); |
| 3978 | $childViewport = ['w' => $viewBox[2], 'h' => $viewBox[3]]; |
| 3979 | } |
| 3980 | $this->viewportStack[] = $childViewport; |
| 3981 | $this->paintChildren($marker, $stream); |
| 3982 | array_pop($this->viewportStack); |
| 3983 | if ($content !== null) { |
| 3984 | $this->popMatrix(); |
| 3985 | } |
| 3986 | $this->popMatrix(); |
| 3987 | $this->contextPaint = $outerContext; |
| 3988 | $stream->restoreGraphicsState(); |
| 3989 | } |
| 3990 | |
| 3991 | /** Upper bound on tile repetitions, guarding against pathological patterns. */ |
| 3992 | private const int MAX_PATTERN_TILES = 4096; |
| 3993 | |
| 3994 | /** |
| 3995 | * Resolve a `fill` paint to the `<pattern>` it references, or null |
| 3996 | * when it isn't a `url(#id)` pointing at a pattern (gradients and |
| 3997 | * flat colours take the ordinary paint path). |
| 3998 | */ |
| 3999 | private function resolveFillPattern(?Paint $paint): ?Pattern |
| 4000 | { |
| 4001 | if (!$paint instanceof Url || $this->document === null) { |
| 4002 | return null; |
| 4003 | } |
| 4004 | $target = $this->document->findByFragment($paint->id); |
| 4005 | // SVG 2 §13.4 — a paint server outside the render tree does not |
| 4006 | // resolve; the caller falls through to the `<paint>` fallback. |
| 4007 | if (!$target instanceof Pattern || !$target->isInRenderTree()) { |
| 4008 | return null; |
| 4009 | } |
| 4010 | $resolved = $this->resolvePatternTemplate($target); |
| 4011 | // CSS Transforms 1 §11 — a non-invertible `patternTransform` |
| 4012 | // invalidates the paint server, so the caller takes the |
| 4013 | // ordinary paint path and lands on the `<paint>` fallback. |
| 4014 | $transform = $resolved->patternTransform(); |
| 4015 | if ($transform !== null && !$transform->isInvertible()) { |
| 4016 | return null; |
| 4017 | } |
| 4018 | // SVG 2 §13.3 — a `<pattern>` with no content is not a usable |
| 4019 | // paint server either. Unlike a stop-less gradient it has no |
| 4020 | // "paint as none" rule of its own, so §13.2's invalid-reference |
| 4021 | // handling applies and the fallback is used. |
| 4022 | if (!self::hasElementChildren($resolved)) { |
| 4023 | return null; |
| 4024 | } |
| 4025 | return $resolved; |
| 4026 | } |
| 4027 | |
| 4028 | /** |
| 4029 | * SVG 2 §13.3 — resolve a `<pattern>`'s template chain. |
| 4030 | * |
| 4031 | * A pattern may reference another via `href` (or the legacy |
| 4032 | * `xlink:href`, which `Pattern::href()` already deprioritises). |
| 4033 | * Attributes the referencing pattern does not itself specify are |
| 4034 | * inherited from the referenced one, and a pattern with no element |
| 4035 | * children of its own paints the referenced pattern's children. |
| 4036 | * That is what makes |
| 4037 | * |
| 4038 | * <pattern id="Copy" href="#Base"></pattern> |
| 4039 | * |
| 4040 | * render exactly like `#Base`. |
| 4041 | * |
| 4042 | * Returns `$pattern` unchanged when it has no `href` (the common |
| 4043 | * case, so the walk costs nothing). Otherwise it returns a synthetic |
| 4044 | * merged pattern; the merged children keep their ORIGINAL parents so |
| 4045 | * style inheritance still reads the defining pattern's cascade. |
| 4046 | * |
| 4047 | * Cycles (`a -> b -> a`) terminate at the first repeat, so a |
| 4048 | * malformed document can't spin the renderer. |
| 4049 | */ |
| 4050 | private function resolvePatternTemplate(Pattern $pattern): Pattern |
| 4051 | { |
| 4052 | if ($pattern->href() === null || $this->document === null) { |
| 4053 | return $pattern; |
| 4054 | } |
| 4055 | /** @var list<Pattern> $chain */ |
| 4056 | $chain = []; |
| 4057 | $seen = []; |
| 4058 | $current = $pattern; |
| 4059 | while (count($chain) < self::MAX_PATTERN_TEMPLATE_DEPTH) { |
| 4060 | $id = spl_object_id($current); |
| 4061 | if (isset($seen[$id])) { |
| 4062 | break; |
| 4063 | } |
| 4064 | $seen[$id] = true; |
| 4065 | $chain[] = $current; |
| 4066 | $href = $current->href(); |
| 4067 | if ($href === null || !str_starts_with($href, '#')) { |
| 4068 | break; |
| 4069 | } |
| 4070 | $next = $this->document->findByFragment(substr($href, 1)); |
| 4071 | if (!$next instanceof Pattern || !$next->isInRenderTree()) { |
| 4072 | break; |
| 4073 | } |
| 4074 | $current = $next; |
| 4075 | } |
| 4076 | if (count($chain) < 2) { |
| 4077 | return $pattern; |
| 4078 | } |
| 4079 | $merged = new Pattern(); |
| 4080 | // Nearest definition wins: seed from the far end of the chain and |
| 4081 | // let each closer link overwrite, so the referencing pattern's own |
| 4082 | // attributes end up on top. |
| 4083 | foreach (array_reverse($chain) as $link) { |
| 4084 | foreach (self::PATTERN_INHERITED_ATTRIBUTES as $name) { |
| 4085 | $value = $link->getAttribute($name); |
| 4086 | if ($value !== null) { |
| 4087 | $merged->setAttribute($name, $value); |
| 4088 | } |
| 4089 | } |
| 4090 | } |
| 4091 | foreach ($chain as $link) { |
| 4092 | if (self::hasElementChildren($link)) { |
| 4093 | $merged->children = $link->children; |
| 4094 | break; |
| 4095 | } |
| 4096 | } |
| 4097 | return $merged; |
| 4098 | } |
| 4099 | |
| 4100 | /** |
| 4101 | * SVG 2 §13.3 — paint `$pattern` into `$element`'s fill region. |
| 4102 | * |
| 4103 | * The caller has just constructed the shape's path on the stream; we |
| 4104 | * turn it into a clip (`W n`) and replicate the pattern tile across |
| 4105 | * the shape's bounding box inside that clip. Because this runs inside |
| 4106 | * the element's own `q cm … Q` transform wrap (see paintElement), the |
| 4107 | * tiles inherit the element's user-space transform automatically — |
| 4108 | * which is why we tile as ordinary geometry rather than emitting a |
| 4109 | * PDF tiling pattern (whose `/Matrix` is anchored to the page's |
| 4110 | * default coordinate system and ignores the fill-time CTM). |
| 4111 | * |
| 4112 | * A stroke, if present, re-emits the path after the fill (the clip |
| 4113 | * consumed the original current path). |
| 4114 | */ |
| 4115 | private function paintPatternFill( |
| 4116 | Pattern $pattern, |
| 4117 | Element $element, |
| 4118 | ContentStream $stream, |
| 4119 | ?Paint $stroke, |
| 4120 | ): void { |
| 4121 | $bbox = BoundingBox::compute($element, viewport: $this->currentViewport()); |
| 4122 | $tile = $bbox !== null ? $this->resolvePatternTile($pattern, $bbox) : null; |
| 4123 | // Whitespace between the tags of an otherwise empty `<pattern>` |
| 4124 | // parses as a text node, so "has children" has to mean "has |
| 4125 | // ELEMENT children" - otherwise `<pattern id="x">\n</pattern>` |
| 4126 | // reads as content-bearing and paints an empty tile. |
| 4127 | $hasContent = self::hasElementChildren($pattern); |
| 4128 | if ($bbox === null || $tile === null || !$hasContent) { |
| 4129 | // Nothing paintable — drop the current path (avoid a stray |
| 4130 | // fill) but still honour a stroke channel if the shape has one. |
| 4131 | $stream->endPath(); |
| 4132 | $this->strokeAfterPattern($element, $stream, $stroke); |
| 4133 | return; |
| 4134 | } |
| 4135 | |
| 4136 | $stream->saveGraphicsState(); |
| 4137 | $stream->clip()->endPath(); // W n — shape path becomes the clip |
| 4138 | $this->emitPatternTiles($pattern, $tile, $bbox, $stream); |
| 4139 | $stream->restoreGraphicsState(); |
| 4140 | |
| 4141 | $this->strokeAfterPattern($element, $stream, $stroke); |
| 4142 | } |
| 4143 | |
| 4144 | /** |
| 4145 | * Whether `$element` has at least one child ELEMENT - as opposed to |
| 4146 | * the whitespace text node that source formatting leaves inside an |
| 4147 | * empty container. |
| 4148 | */ |
| 4149 | private static function hasElementChildren(Element $element): bool |
| 4150 | { |
| 4151 | foreach ($element->children as $child) { |
| 4152 | if ($child instanceof Element) { |
| 4153 | return true; |
| 4154 | } |
| 4155 | } |
| 4156 | return false; |
| 4157 | } |
| 4158 | |
| 4159 | /** |
| 4160 | * Resolve the pattern's tile rectangle in the referencing element's |
| 4161 | * user space. `patternUnits="objectBoundingBox"` (the default) reads |
| 4162 | * x/y/width/height as fractions of the element bbox; `userSpaceOnUse` |
| 4163 | * reads them as plain user units. |
| 4164 | * |
| 4165 | * @param array{minX: float, minY: float, width: float, height: float} $bbox |
| 4166 | * @return array{x: float, y: float, w: float, h: float}|null |
| 4167 | */ |
| 4168 | private function resolvePatternTile(Pattern $pattern, array $bbox): ?array |
| 4169 | { |
| 4170 | if ($pattern->patternUnits() === 'objectBoundingBox') { |
| 4171 | $x = $bbox['minX'] + $pattern->x() * $bbox['width']; |
| 4172 | $y = $bbox['minY'] + $pattern->y() * $bbox['height']; |
| 4173 | $w = $pattern->width() * $bbox['width']; |
| 4174 | $h = $pattern->height() * $bbox['height']; |
| 4175 | } else { |
| 4176 | $x = $pattern->x(); |
| 4177 | $y = $pattern->y(); |
| 4178 | $w = $pattern->width(); |
| 4179 | $h = $pattern->height(); |
| 4180 | } |
| 4181 | return $w > 0.0 && $h > 0.0 ? ['x' => $x, 'y' => $y, 'w' => $w, 'h' => $h] : null; |
| 4182 | } |
| 4183 | |
| 4184 | /** |
| 4185 | * Replicate the pattern tile across the shape's bounding box. Each |
| 4186 | * cell is translated onto the tile grid, clipped to the tile rect so |
| 4187 | * content can't bleed into neighbours (SVG 2 §13.3), and its children |
| 4188 | * painted. The base cell (i=j=0) paints children at their authored |
| 4189 | * coordinates; further cells translate by whole tile steps. |
| 4190 | * |
| 4191 | * @param array{x: float, y: float, w: float, h: float} $tile |
| 4192 | * @param array{minX: float, minY: float, width: float, height: float} $bbox |
| 4193 | */ |
| 4194 | private function emitPatternTiles( |
| 4195 | Pattern $pattern, |
| 4196 | array $tile, |
| 4197 | array $bbox, |
| 4198 | ContentStream $stream, |
| 4199 | ): void { |
| 4200 | $pw = $tile['w']; |
| 4201 | $ph = $tile['h']; |
| 4202 | // SVG 2 §13.3 — `patternTransform` moves the whole tiling |
| 4203 | // lattice while the shape it fills stays put. Concatenating it |
| 4204 | // once around the tile loop is the lattice half; the range the |
| 4205 | // loop covers has to be computed in the PATTERN's own space, |
| 4206 | // which is the shape's bounding box mapped back through the |
| 4207 | // inverse. Skipping that left the near edge of the shape |
| 4208 | // unpainted whenever the transform pushed the lattice forward. |
| 4209 | $patternMatrix = $pattern->patternTransform()?->toMatrix(); |
| 4210 | $inverse = $patternMatrix === null ? null : self::invertAffine($patternMatrix); |
| 4211 | if ($patternMatrix !== null && $inverse !== null) { |
| 4212 | $stream->saveGraphicsState(); |
| 4213 | $stream->concatMatrix( |
| 4214 | $patternMatrix[0], |
| 4215 | $patternMatrix[1], |
| 4216 | $patternMatrix[2], |
| 4217 | $patternMatrix[3], |
| 4218 | $patternMatrix[4], |
| 4219 | $patternMatrix[5], |
| 4220 | ); |
| 4221 | $bbox = self::transformBoundingBox($bbox, $inverse); |
| 4222 | } |
| 4223 | $contentMatrix = $this->patternContentMatrix($pattern, $tile, $bbox); |
| 4224 | $i0 = (int) floor(($bbox['minX'] - $tile['x']) / $pw); |
| 4225 | $i1 = (int) ceil(($bbox['minX'] + $bbox['width'] - $tile['x']) / $pw); |
| 4226 | $j0 = (int) floor(($bbox['minY'] - $tile['y']) / $ph); |
| 4227 | $j1 = (int) ceil(($bbox['minY'] + $bbox['height'] - $tile['y']) / $ph); |
| 4228 | if (($i1 - $i0) * ($j1 - $j0) <= self::MAX_PATTERN_TILES) { |
| 4229 | for ($j = $j0; $j < $j1; $j++) { |
| 4230 | for ($i = $i0; $i < $i1; $i++) { |
| 4231 | $stream->saveGraphicsState(); |
| 4232 | $stream->concatMatrix(1.0, 0.0, 0.0, 1.0, $i * $pw, $j * $ph); |
| 4233 | $stream->rectangle($tile['x'], $tile['y'], $pw, $ph); |
| 4234 | $stream->clip()->endPath(); |
| 4235 | // SVG 2 §13.3 — a `<pattern>` `viewBox` establishes |
| 4236 | // a coordinate system for its content, mapped into |
| 4237 | // the tile rectangle under `preserveAspectRatio`, |
| 4238 | // exactly as a nested `<svg>` maps into its |
| 4239 | // viewport. |
| 4240 | if ($contentMatrix !== null) { |
| 4241 | $stream->concatMatrix( |
| 4242 | $contentMatrix[0], |
| 4243 | 0.0, |
| 4244 | 0.0, |
| 4245 | $contentMatrix[1], |
| 4246 | $contentMatrix[2], |
| 4247 | $contentMatrix[3], |
| 4248 | ); |
| 4249 | } |
| 4250 | $this->paintChildren($pattern, $stream); |
| 4251 | $stream->restoreGraphicsState(); |
| 4252 | } |
| 4253 | } |
| 4254 | } |
| 4255 | if ($patternMatrix !== null && $inverse !== null) { |
| 4256 | $stream->restoreGraphicsState(); |
| 4257 | } |
| 4258 | } |
| 4259 | |
| 4260 | /** |
| 4261 | * The viewBox-to-tile mapping for a `<pattern>`'s content, as |
| 4262 | * `[scaleX, scaleY, translateX, translateY]`, or null when the |
| 4263 | * pattern declares no usable `viewBox`. |
| 4264 | * |
| 4265 | * SVG 2 §13.3 — the mapping is the same one a nested `<svg>` |
| 4266 | * applies, `preserveAspectRatio` included, with the tile rectangle |
| 4267 | * standing in for the viewport. A degenerate viewBox (zero width |
| 4268 | * or height) would divide by zero, so it is ignored rather than |
| 4269 | * emitting a NaN matrix. |
| 4270 | * |
| 4271 | * @param array{x: float, y: float, w: float, h: float} $tile |
| 4272 | * @param array{minX: float, minY: float, width: float, height: float} $bbox |
| 4273 | * @return array{float, float, float, float}|null |
| 4274 | */ |
| 4275 | private function patternContentMatrix(Pattern $pattern, array $tile, array $bbox): ?array |
| 4276 | { |
| 4277 | $viewBox = $pattern->viewBox(); |
| 4278 | if ($viewBox === null || $viewBox[2] <= 0.0 || $viewBox[3] <= 0.0) { |
| 4279 | // SVG 2 §13.3 — `patternContentUnits="objectBoundingBox"` |
| 4280 | // puts the tile's CONTENT in bounding-box units: the origin |
| 4281 | // is the box's own corner and one unit is its full extent, |
| 4282 | // so `<rect width="1" height="1"/>` covers the shape. The |
| 4283 | // attribute is ignored when a `viewBox` is present, which |
| 4284 | // establishes its own coordinate system instead — hence |
| 4285 | // this sitting on the no-viewBox branch. |
| 4286 | if ($pattern->patternContentUnits() !== 'objectBoundingBox' |
| 4287 | || $bbox['width'] <= 0.0 |
| 4288 | || $bbox['height'] <= 0.0 |
| 4289 | ) { |
| 4290 | return null; |
| 4291 | } |
| 4292 | return [ |
| 4293 | $bbox['width'], |
| 4294 | $bbox['height'], |
| 4295 | $bbox['minX'], |
| 4296 | $bbox['minY'], |
| 4297 | ]; |
| 4298 | } |
| 4299 | [$scaleX, $scaleY, $offsetX, $offsetY] |
| 4300 | = $this->nestedViewBoxTransform($pattern, $viewBox[2], $viewBox[3], $tile['w'], $tile['h']); |
| 4301 | return [ |
| 4302 | $scaleX, |
| 4303 | $scaleY, |
| 4304 | $tile['x'] + $offsetX - $viewBox[0] * $scaleX, |
| 4305 | $tile['y'] + $offsetY - $viewBox[1] * $scaleY, |
| 4306 | ]; |
| 4307 | } |
| 4308 | |
| 4309 | /** |
| 4310 | * Inverse of an affine `[a, b, c, d, e, f]`, or null when it is |
| 4311 | * singular. A singular `patternTransform` is rejected earlier as an |
| 4312 | * invalid paint server, so the null branch is a belt-and-braces |
| 4313 | * guard against a divide by zero. |
| 4314 | * |
| 4315 | * @param array{float, float, float, float, float, float} $m |
| 4316 | * @return array{float, float, float, float, float, float}|null |
| 4317 | */ |
| 4318 | private static function invertAffine(array $m): ?array |
| 4319 | { |
| 4320 | [$a, $b, $c, $d, $e, $f] = $m; |
| 4321 | $determinant = $a * $d - $b * $c; |
| 4322 | if ($determinant === 0.0) { |
| 4323 | return null; |
| 4324 | } |
| 4325 | return [ |
| 4326 | $d / $determinant, |
| 4327 | -$b / $determinant, |
| 4328 | -$c / $determinant, |
| 4329 | $a / $determinant, |
| 4330 | ($c * $f - $d * $e) / $determinant, |
| 4331 | ($b * $e - $a * $f) / $determinant, |
| 4332 | ]; |
| 4333 | } |
| 4334 | |
| 4335 | /** |
| 4336 | * The axis-aligned bounding box of `$bbox` mapped through `$m` — |
| 4337 | * all four corners, since a rotation or skew turns the rectangle |
| 4338 | * into a parallelogram. |
| 4339 | * |
| 4340 | * @param array{minX: float, minY: float, width: float, height: float} $bbox |
| 4341 | * @param array{float, float, float, float, float, float} $m |
| 4342 | * @return array{minX: float, minY: float, width: float, height: float} |
| 4343 | */ |
| 4344 | private static function transformBoundingBox(array $bbox, array $m): array |
| 4345 | { |
| 4346 | [$a, $b, $c, $d, $e, $f] = $m; |
| 4347 | $xs = []; |
| 4348 | $ys = []; |
| 4349 | foreach ( |
| 4350 | [ |
| 4351 | [$bbox['minX'], $bbox['minY']], |
| 4352 | [$bbox['minX'] + $bbox['width'], $bbox['minY']], |
| 4353 | [$bbox['minX'], $bbox['minY'] + $bbox['height']], |
| 4354 | [$bbox['minX'] + $bbox['width'], $bbox['minY'] + $bbox['height']], |
| 4355 | ] as [$x, $y] |
| 4356 | ) { |
| 4357 | $xs[] = $a * $x + $c * $y + $e; |
| 4358 | $ys[] = $b * $x + $d * $y + $f; |
| 4359 | } |
| 4360 | return [ |
| 4361 | 'minX' => min($xs), |
| 4362 | 'minY' => min($ys), |
| 4363 | 'width' => max($xs) - min($xs), |
| 4364 | 'height' => max($ys) - min($ys), |
| 4365 | ]; |
| 4366 | } |
| 4367 | |
| 4368 | /** |
| 4369 | * Stroke the shape after a pattern fill. The pattern path was |
| 4370 | * consumed by the clip, so re-emit it and stroke when the element |
| 4371 | * carries a real stroke paint. |
| 4372 | */ |
| 4373 | private function strokeAfterPattern(Element $element, ContentStream $stream, ?Paint $stroke): void |
| 4374 | { |
| 4375 | if ($stroke === null || $stroke instanceof None_) { |
| 4376 | return; |
| 4377 | } |
| 4378 | if (!$this->applyStrokePaint($stroke, $element, $stream)) { |
| 4379 | return; |
| 4380 | } |
| 4381 | $this->emitElementPath($element, $stream); |
| 4382 | $stream->stroke(); |
| 4383 | } |
| 4384 | |
| 4385 | /** |
| 4386 | * Configure the fill colour and report whether the element wants a |
| 4387 | * fill at all. Default (null paint) = SVG-spec black fill; explicit |
| 4388 | * `none` = no fill; `currentColor` resolves to black at 3K (the |
| 4389 | * cascade-resolved `color` lands later). Gradient/pattern `url(#…)` |
| 4390 | * is deferred to 3O. |
| 4391 | */ |
| 4392 | private function applyFillPaint(?Paint $paint, Element $element, ContentStream $stream): bool |
| 4393 | { |
| 4394 | if ($paint instanceof None_) { |
| 4395 | return false; |
| 4396 | } |
| 4397 | if ($paint instanceof Url) { |
| 4398 | if ($this->gradientPainter?->applyAsFill($paint->id, $element, $stream, $this->currentMatrix(), $this->currentViewport()) ?? false) { |
| 4399 | return true; |
| 4400 | } |
| 4401 | // SVG 2 §13.4 — a gradient that resolves but defines no |
| 4402 | // stops paints as `none`. The server EXISTS and says |
| 4403 | // "paint nothing", so this is not a failed reference and |
| 4404 | // the fallback must not overpaint what's underneath. |
| 4405 | if ($this->gradientPainter?->paintsAsNone($paint->id) ?? false) { |
| 4406 | return false; |
| 4407 | } |
| 4408 | // SVG 2 §13.2 — the reference didn't resolve to a usable |
| 4409 | // paint server, so the fallback paint applies. With NO |
| 4410 | // fallback the element is in error and is simply not |
| 4411 | // rendered: several WPT fixtures stack a correct shape |
| 4412 | // underneath and rely on the broken one staying invisible, |
| 4413 | // so falling through to the black default here would paint |
| 4414 | // over them. |
| 4415 | if ($paint->fallback === null) { |
| 4416 | return false; |
| 4417 | } |
| 4418 | return $this->applyFillPaint($paint->fallback, $element, $stream); |
| 4419 | } |
| 4420 | if ($paint instanceof SolidColor) { |
| 4421 | $this->setFillColor($stream, $paint->color); |
| 4422 | return true; |
| 4423 | } |
| 4424 | if ($paint instanceof CurrentColor) { |
| 4425 | $this->setFillColor($stream, $this->currentColorOf($element)); |
| 4426 | return true; |
| 4427 | } |
| 4428 | if ($paint instanceof ContextPaint) { |
| 4429 | // SVG 2 §13.2.1 — outside a referencing context there is |
| 4430 | // no context element, and the keyword resolves to `none`. |
| 4431 | $resolved = $this->contextPaint?->of($paint); |
| 4432 | return $resolved !== null |
| 4433 | && $this->applyFillPaint($resolved, $element, $stream); |
| 4434 | } |
| 4435 | // null → SVG 2 §13.2.1 default of black. |
| 4436 | $stream->setFillColorRGB(0.0, 0.0, 0.0); |
| 4437 | return true; |
| 4438 | } |
| 4439 | |
| 4440 | /** |
| 4441 | * CSS Color 4 §3.2 — the used value of `currentColor` is the |
| 4442 | * computed value of the element's own `color` property, whose |
| 4443 | * initial value is black. |
| 4444 | * |
| 4445 | * `color` inherits, and the cascade projection is what carries an |
| 4446 | * ancestor's declaration down to the element, so this reads the |
| 4447 | * element's own resolved value rather than walking parents here. |
| 4448 | */ |
| 4449 | private function currentColorOf(Element $element): ColorInterface |
| 4450 | { |
| 4451 | $raw = $element->colorValue(); |
| 4452 | if ($raw !== null) { |
| 4453 | $color = SvgColor::parse($raw); |
| 4454 | if ($color !== null) { |
| 4455 | return $color; |
| 4456 | } |
| 4457 | } |
| 4458 | return new RgbColor(0, 0, 0); |
| 4459 | } |
| 4460 | |
| 4461 | /** |
| 4462 | * Configure the stroke colour and report whether the element wants |
| 4463 | * to stroke. Default (null paint) = SVG-spec "no stroke"; explicit |
| 4464 | * `none` = no stroke. |
| 4465 | */ |
| 4466 | private function applyStrokePaint(?Paint $paint, Element $element, ContentStream $stream): bool |
| 4467 | { |
| 4468 | if ($paint === null || $paint instanceof None_) { |
| 4469 | return false; |
| 4470 | } |
| 4471 | if ($paint instanceof Url) { |
| 4472 | if ($this->gradientPainter?->applyAsStroke($paint->id, $element, $stream, $this->currentMatrix(), $this->currentViewport()) ?? false) { |
| 4473 | return true; |
| 4474 | } |
| 4475 | // SVG 2 §13.4, as in applyFillPaint(): a stop-less gradient |
| 4476 | // paints as `none`, which is not a failed reference. |
| 4477 | if ($this->gradientPainter?->paintsAsNone($paint->id) ?? false) { |
| 4478 | return false; |
| 4479 | } |
| 4480 | // SVG 2 §13.2, as in applyFillPaint(): fallback, or don't |
| 4481 | // stroke at all. |
| 4482 | if ($paint->fallback === null) { |
| 4483 | return false; |
| 4484 | } |
| 4485 | return $this->applyStrokePaint($paint->fallback, $element, $stream); |
| 4486 | } |
| 4487 | if ($paint instanceof SolidColor) { |
| 4488 | $this->setStrokeColor($stream, $paint->color); |
| 4489 | return true; |
| 4490 | } |
| 4491 | if ($paint instanceof ContextPaint) { |
| 4492 | $resolved = $this->contextPaint?->of($paint); |
| 4493 | return $resolved !== null |
| 4494 | && $this->applyStrokePaint($resolved, $element, $stream); |
| 4495 | } |
| 4496 | $this->setStrokeColor($stream, $this->currentColorOf($element)); |
| 4497 | return true; |
| 4498 | } |
| 4499 | |
| 4500 | private function setFillColor(ContentStream $stream, ColorInterface $color): void |
| 4501 | { |
| 4502 | match (true) { |
| 4503 | $color instanceof RgbColor => $stream->setFillRgbColor($color), |
| 4504 | $color instanceof CmykColor => $stream->setFillCmykColor($color), |
| 4505 | $color instanceof GrayColor => $stream->setFillGrayColor($color), |
| 4506 | default => $stream->setFillColorRGB(0.0, 0.0, 0.0), |
| 4507 | }; |
| 4508 | } |
| 4509 | |
| 4510 | private function setStrokeColor(ContentStream $stream, ColorInterface $color): void |
| 4511 | { |
| 4512 | match (true) { |
| 4513 | $color instanceof RgbColor => $stream->setStrokeRgbColor($color), |
| 4514 | $color instanceof CmykColor => $stream->setStrokeCmykColor($color), |
| 4515 | $color instanceof GrayColor => $stream->setStrokeGrayColor($color), |
| 4516 | default => $stream->setStrokeColorRGB(0.0, 0.0, 0.0), |
| 4517 | }; |
| 4518 | } |
| 4519 | } |