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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 §15.14 — common base for `feFuncR`, |
| 11 | * `feFuncG`, `feFuncB`, `feFuncA`. Each defines a transfer |
| 12 | * function for one colour channel. |
| 13 | * |
| 14 | * `type` chooses the function shape: |
| 15 | * |
| 16 | * identity (default) — `out = in` |
| 17 | * table — piecewise-linear lookup table |
| 18 | * discrete — step function |
| 19 | * linear — `out = slope·in + intercept` |
| 20 | * gamma — `out = amplitude · in^exponent + offset` |
| 21 | */ |
| 22 | abstract class FeFunc extends Element |
| 23 | { |
| 24 | public function type(): string |
| 25 | { |
| 26 | $v = strtolower($this->getAttribute('type') ?? 'identity'); |
| 27 | return match ($v) { |
| 28 | 'identity', 'table', 'discrete', 'linear', 'gamma' => $v, |
| 29 | default => 'identity', |
| 30 | }; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * @return list<float> |
| 35 | */ |
| 36 | public function tableValues(): array |
| 37 | { |
| 38 | $raw = trim($this->getAttribute('tableValues') ?? ''); |
| 39 | if ($raw === '') { |
| 40 | return []; |
| 41 | } |
| 42 | $parts = preg_split('/[\s,]+/', $raw) ?: []; |
| 43 | $out = []; |
| 44 | foreach ($parts as $p) { |
| 45 | if ($p === '') { |
| 46 | continue; |
| 47 | } |
| 48 | $out[] = (float) $p; |
| 49 | } |
| 50 | return $out; |
| 51 | } |
| 52 | |
| 53 | public function slope(): float |
| 54 | { |
| 55 | return (float) ($this->getAttribute('slope') ?? 1); |
| 56 | } |
| 57 | |
| 58 | public function intercept(): float |
| 59 | { |
| 60 | return (float) ($this->getAttribute('intercept') ?? 0); |
| 61 | } |
| 62 | |
| 63 | public function amplitude(): float |
| 64 | { |
| 65 | return (float) ($this->getAttribute('amplitude') ?? 1); |
| 66 | } |
| 67 | |
| 68 | public function exponent(): float |
| 69 | { |
| 70 | return (float) ($this->getAttribute('exponent') ?? 1); |
| 71 | } |
| 72 | |
| 73 | public function offset(): float |
| 74 | { |
| 75 | return (float) ($this->getAttribute('offset') ?? 0); |
| 76 | } |
| 77 | } |