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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg\Filter; |
| 6 | |
| 7 | /** |
| 8 | * SVG 2 Filter Effects §15.6 — `<feComposite operator in in2>`. |
| 9 | * Porter-Duff composite of two inputs. |
| 10 | * |
| 11 | * operator: over (default) | in | out | atop | xor | lighter | |
| 12 | * arithmetic |
| 13 | * |
| 14 | * When `operator="arithmetic"` the four k coefficients drive the |
| 15 | * per-pixel formula `result = k1·in·in2 + k2·in + k3·in2 + k4`. |
| 16 | */ |
| 17 | final class FeComposite extends FilterPrimitive |
| 18 | { |
| 19 | public function __construct() |
| 20 | { |
| 21 | parent::__construct('feComposite'); |
| 22 | } |
| 23 | |
| 24 | public function operator(): string |
| 25 | { |
| 26 | $v = strtolower($this->getAttribute('operator') ?? 'over'); |
| 27 | $known = ['over', 'in', 'out', 'atop', 'xor', 'lighter', 'arithmetic']; |
| 28 | return in_array($v, $known, true) ? $v : 'over'; |
| 29 | } |
| 30 | |
| 31 | public function in2(): ?string |
| 32 | { |
| 33 | return $this->getAttribute('in2'); |
| 34 | } |
| 35 | |
| 36 | public function k1(): float |
| 37 | { |
| 38 | return (float) ($this->getAttribute('k1') ?? 0); |
| 39 | } |
| 40 | |
| 41 | public function k2(): float |
| 42 | { |
| 43 | return (float) ($this->getAttribute('k2') ?? 0); |
| 44 | } |
| 45 | |
| 46 | public function k3(): float |
| 47 | { |
| 48 | return (float) ($this->getAttribute('k3') ?? 0); |
| 49 | } |
| 50 | |
| 51 | public function k4(): float |
| 52 | { |
| 53 | return (float) ($this->getAttribute('k4') ?? 0); |
| 54 | } |
| 55 | } |