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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | /** |
| 8 | * SVG `<mask>` per SVG 2 §14.5 — a luminance- or alpha-based stencil applied |
| 9 | * to elements that reference it via `mask`. Has its own bounding rectangle |
| 10 | * (`x`, `y`, `width`, `height`), and two independent unit attributes: |
| 11 | * `maskUnits` controls how the rectangle is interpreted, `maskContentUnits` |
| 12 | * controls how the children's coordinates are interpreted. |
| 13 | */ |
| 14 | final class Mask extends Element |
| 15 | { |
| 16 | public function __construct() |
| 17 | { |
| 18 | parent::__construct('mask'); |
| 19 | } |
| 20 | |
| 21 | /** |
| 22 | * `maskUnits` — interpretation of the `x`/`y`/`width`/`height` rect. |
| 23 | * Default `objectBoundingBox` per SVG 2 §14.5.4. |
| 24 | * |
| 25 | * @return 'userSpaceOnUse'|'objectBoundingBox' |
| 26 | */ |
| 27 | public function maskUnits(): string |
| 28 | { |
| 29 | return $this->parseUnitsAttribute('maskUnits', 'objectBoundingBox'); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * `maskContentUnits` — interpretation of the children's coordinates. |
| 34 | * Default `userSpaceOnUse` per SVG 2 §14.5.4. |
| 35 | * |
| 36 | * @return 'userSpaceOnUse'|'objectBoundingBox' |
| 37 | */ |
| 38 | public function maskContentUnits(): string |
| 39 | { |
| 40 | return $this->parseUnitsAttribute('maskContentUnits', 'userSpaceOnUse'); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * `x` — null when absent so the painter applies the SVG 2 default |
| 45 | * (`-10%` of the masked element's bbox in `objectBoundingBox` mode, |
| 46 | * which we can't resolve here without the bbox). |
| 47 | */ |
| 48 | public function x(): ?float |
| 49 | { |
| 50 | return $this->parseOptionalLength('x'); |
| 51 | } |
| 52 | |
| 53 | public function y(): ?float |
| 54 | { |
| 55 | return $this->parseOptionalLength('y'); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * `width` — null when absent so the painter applies the default |
| 60 | * `120%` per SVG 2 §14.5.4. Non-negative. |
| 61 | */ |
| 62 | public function width(): ?float |
| 63 | { |
| 64 | $v = $this->parseOptionalLength('width'); |
| 65 | return $v !== null && $v < 0.0 ? null : $v; |
| 66 | } |
| 67 | |
| 68 | public function height(): ?float |
| 69 | { |
| 70 | $v = $this->parseOptionalLength('height'); |
| 71 | return $v !== null && $v < 0.0 ? null : $v; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @return 'userSpaceOnUse'|'objectBoundingBox' |
| 76 | */ |
| 77 | private function parseUnitsAttribute(string $attr, string $default): string |
| 78 | { |
| 79 | $raw = $this->getAttribute($attr); |
| 80 | if ($raw === null) { |
| 81 | /** @var 'userSpaceOnUse'|'objectBoundingBox' $default */ |
| 82 | return $default; |
| 83 | } |
| 84 | $value = trim($raw); |
| 85 | return match ($value) { |
| 86 | 'userSpaceOnUse', 'objectBoundingBox' => $value, |
| 87 | default => $default === 'userSpaceOnUse' ? 'userSpaceOnUse' : 'objectBoundingBox', |
| 88 | }; |
| 89 | } |
| 90 | |
| 91 | private function parseOptionalLength(string $attr): ?float |
| 92 | { |
| 93 | $raw = $this->getAttribute($attr); |
| 94 | if ($raw === null) { |
| 95 | return null; |
| 96 | } |
| 97 | if (preg_match('/^\s*([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)/', $raw, $m) !== 1) { |
| 98 | return null; |
| 99 | } |
| 100 | return (float) $m[1]; |
| 101 | } |
| 102 | } |