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PdfEColorSpaceConstraint
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1<?php
2
3declare(strict_types=1);
4
5namespace Phpdftk\Pdf\Conformance\Constraint;
6
7use Phpdftk\Pdf\Conformance\Inspection\DocumentInspector;
8use Phpdftk\Pdf\Conformance\Profile\ConformanceProfile;
9use Phpdftk\Pdf\Conformance\Result\ConformanceViolation;
10use Phpdftk\Pdf\Conformance\Result\ViolationSeverity;
11
12/**
13 * ISO 24517-1 (PDF/E-1): Color space validation.
14 *
15 * Device-dependent color spaces (DeviceRGB, DeviceCMYK, DeviceGray) should
16 * be anchored by an OutputIntent with an ICC profile, or device-independent
17 * color spaces should be used instead.
18 */
19final class PdfEColorSpaceConstraint implements ConformanceConstraint
20{
21    public function check(DocumentInspector $inspector, ConformanceProfile $profile): array
22    {
23        // If an OutputIntent with ICC profile exists, device colors are anchored
24        if ($inspector->hasOutputIntentWithIccProfile()) {
25            return [];
26        }
27
28        // Check whether device-dependent color spaces are used without an OutputIntent
29        if (!$inspector->hasOutputIntents()) {
30            return [
31                new ConformanceViolation(
32                    clause: '6.2.2',
33                    message: 'PDF/E-1 documents using device-dependent color spaces should include an OutputIntent with ICC profile',
34                    severity: ViolationSeverity::Warning,
35                    objectPath: 'Catalog.OutputIntents',
36                ),
37            ];
38        }
39
40        return [];
41    }
42}