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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Filter; |
| 6 | |
| 7 | use Phpdftk\Svg\Element; |
| 8 | |
| 9 | /** |
| 10 | * SVG 2 Filter Effects §6.2 — common base for the `<fe*>` filter |
| 11 | * primitives (`<feGaussianBlur>`, `<feColorMatrix>`, etc.). Each |
| 12 | * primitive sits inside a `<filter>` element and consumes one or |
| 13 | * two inputs (`in` / `in2`) producing one named output (`result`). |
| 14 | * |
| 15 | * The "primitive subregion" attributes (`x`, `y`, `width`, `height`) |
| 16 | * crop the primitive's effect rectangle inside the filter region. |
| 17 | * Defaults come from the parent `<filter>`'s `primitiveUnits` — for |
| 18 | * `userSpaceOnUse` the defaults are the filter region; for |
| 19 | * `objectBoundingBox` the defaults are 0/0/100%/100% of the |
| 20 | * referencing shape's bbox. |
| 21 | * |
| 22 | * Standard input names (used by the `in` / `in2` attributes): |
| 23 | * |
| 24 | * SourceGraphic — the referencing element's rendering |
| 25 | * SourceAlpha — the alpha channel of SourceGraphic |
| 26 | * BackgroundImage — what's behind the element (gated by |
| 27 | * `enable-background` on an ancestor) |
| 28 | * BackgroundAlpha — the alpha channel of BackgroundImage |
| 29 | * FillPaint — the element's resolved fill paint |
| 30 | * StrokePaint — the element's resolved stroke paint |
| 31 | * |
| 32 | * <result-name> — a previously-emitted result name from |
| 33 | * a sibling primitive |
| 34 | */ |
| 35 | abstract class FilterPrimitive extends Element |
| 36 | { |
| 37 | public function x(): ?float |
| 38 | { |
| 39 | $v = $this->getAttribute('x'); |
| 40 | return $v !== null ? (float) $v : null; |
| 41 | } |
| 42 | |
| 43 | public function y(): ?float |
| 44 | { |
| 45 | $v = $this->getAttribute('y'); |
| 46 | return $v !== null ? (float) $v : null; |
| 47 | } |
| 48 | |
| 49 | public function width(): ?float |
| 50 | { |
| 51 | $v = $this->getAttribute('width'); |
| 52 | return $v !== null ? (float) $v : null; |
| 53 | } |
| 54 | |
| 55 | public function height(): ?float |
| 56 | { |
| 57 | $v = $this->getAttribute('height'); |
| 58 | return $v !== null ? (float) $v : null; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Input source name. `null` (= attribute absent) means the |
| 63 | * primitive consumes whatever the previous sibling produced |
| 64 | * (or `SourceGraphic` if it's the first child). |
| 65 | */ |
| 66 | public function in(): ?string |
| 67 | { |
| 68 | return $this->getAttribute('in'); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Result name. `null` means the primitive doesn't expose a |
| 73 | * named result; it can still be consumed by the next sibling |
| 74 | * as the implicit input. |
| 75 | */ |
| 76 | public function result(): ?string |
| 77 | { |
| 78 | return $this->getAttribute('result'); |
| 79 | } |
| 80 | } |