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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Core\Graphics\Shading;
6
7use Phpdftk\Pdf\Core\Graphics\ColorSpace\ColorSpace;
8use Phpdftk\Pdf\Core\PdfArray;
9use Phpdftk\Pdf\Core\PdfBoolean;
10use Phpdftk\Pdf\Core\PdfDictionary;
11use Phpdftk\Pdf\Core\PdfName;
12use Phpdftk\Pdf\Core\PdfNumber;
13use Phpdftk\Pdf\Core\PdfReference;
14use Phpdftk\Pdf\Core\PdfStream;
15
16/**
17 * Abstract base for stream-based shading types 4–7.
18 *
19 * All mesh-based shadings share: BitsPerCoordinate, BitsPerComponent,
20 * BitsPerFlag (types 4, 6, 7 only), Decode, Function (optional).
21 * Subclasses contribute their own required entries.
22 */
23abstract class MeshShading extends PdfStream
24{
25    public ColorSpace|PdfName|PdfArray $colorSpace;
26    public ?PdfArray $background = null;
27    public ?PdfArray $bbox = null;
28    public ?bool $antiAlias = null;
29
30    public int $bitsPerCoordinate;
31    public int $bitsPerComponent;
32    public PdfArray $decode;
33    public PdfReference|PdfArray|null $function = null;
34
35    public function __construct(
36        ColorSpace|PdfName|PdfArray $colorSpace,
37        int $bitsPerCoordinate,
38        int $bitsPerComponent,
39        PdfArray $decode,
40        string $meshData = '',
41    ) {
42        parent::__construct(new PdfDictionary(), $meshData);
43        $this->colorSpace = $colorSpace;
44        $this->bitsPerCoordinate = $bitsPerCoordinate;
45        $this->bitsPerComponent = $bitsPerComponent;
46        $this->decode = $decode;
47    }
48
49    abstract public function getShadingType(): int;
50
51    protected function populateCommon(): void
52    {
53        $this->dictionary->set('ShadingType', new PdfNumber($this->getShadingType()));
54        $this->dictionary->set('ColorSpace', $this->colorSpace);
55        if ($this->background !== null) {
56            $this->dictionary->set('Background', $this->background);
57        }
58        if ($this->bbox !== null) {
59            $this->dictionary->set('BBox', $this->bbox);
60        }
61        if ($this->antiAlias !== null) {
62            $this->dictionary->set('AntiAlias', new PdfBoolean($this->antiAlias));
63        }
64        $this->dictionary->set('BitsPerCoordinate', new PdfNumber($this->bitsPerCoordinate));
65        $this->dictionary->set('BitsPerComponent', new PdfNumber($this->bitsPerComponent));
66        $this->dictionary->set('Decode', $this->decode);
67        if ($this->function !== null) {
68            $this->dictionary->set('Function', $this->function);
69        }
70    }
71}