PNGMetadataExtractorTest.php

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<?php
class PNGMetadataExtractorTest extends MediaWikiTestCase {

        protected function setUp() {
                parent::setUp();
                $this->filePath = __DIR__ . '/../../data/media/';
        }

        function testPngNativetZtxt() {
                $this->checkPHPExtension( 'zlib' );

                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );
                $expected = "foo bar baz foo foo foo foof foo foo foo foo";
                $this->assertArrayHasKey( 'text', $meta );
                $meta = $meta['text'];
                $this->assertArrayHasKey( 'Make', $meta );
                $this->assertArrayHasKey( 'x-default', $meta['Make'] );

                $this->assertEquals( $expected, $meta['Make']['x-default'] );
        }

        function testPngNativeText() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );
                $expected = "Some long image desc";
                $this->assertArrayHasKey( 'text', $meta );
                $meta = $meta['text'];
                $this->assertArrayHasKey( 'ImageDescription', $meta );
                $this->assertArrayHasKey( 'x-default', $meta['ImageDescription'] );
                $this->assertArrayHasKey( '_type', $meta['ImageDescription'] );

                $this->assertEquals( $expected, $meta['ImageDescription']['x-default'] );
        }

        function testPngNativeTextNonAscii() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );

                // Note the Copyright symbol here is a utf-8 one
                // (aka \xC2\xA9) where in the file its iso-8859-1
                // encoded as just \xA9.
                $expected = "© 2010 Bawolff";


                $this->assertArrayHasKey( 'text', $meta );
                $meta = $meta['text'];
                $this->assertArrayHasKey( 'Copyright', $meta );
                $this->assertArrayHasKey( 'x-default', $meta['Copyright'] );

                $this->assertEquals( $expected, $meta['Copyright']['x-default'] );
        }

        /*
        function testPngPhysTag () {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );

                $this->assertArrayHasKey( 'text', $meta );
                $meta = $meta['text'];

                $this->assertEquals( '2835/100', $meta['XResolution'] );
                $this->assertEquals( '2835/100', $meta['YResolution'] );
                $this->assertEquals( 3, $meta['ResolutionUnit'] ); // 3 = cm
        }
        */

        function testStaticPngAnimationMetadata() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );

                $this->assertEquals( 0, $meta['frameCount'] );
                $this->assertEquals( 1, $meta['loopCount'] );
                $this->assertEquals( 0, $meta['duration'] );
        }

        function testApngAnimationMetadata() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Animated_PNG_example_bouncing_beach_ball.png' );

                $this->assertEquals( 20, $meta['frameCount'] );
                // Note loop count of 0 = infinity
                $this->assertEquals( 0, $meta['loopCount'] );
                $this->assertEquals( 1.5, $meta['duration'], '', 0.00001 );
        }

        function testPngBitDepth8() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );

                $this->assertEquals( 8, $meta['bitDepth'] );
        }

        function testPngBitDepth1() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        '1bit-png.png' );
                $this->assertEquals( 1, $meta['bitDepth'] );
        }


        function testPngIndexColour() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'Png-native-test.png' );

                $this->assertEquals( 'index-coloured', $meta['colorType'] );
        }

        function testPngRgbColour() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'rgb-png.png' );
                $this->assertEquals( 'truecolour-alpha', $meta['colorType'] );
        }

        function testPngRgbNoAlphaColour() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'rgb-na-png.png' );
                $this->assertEquals( 'truecolour', $meta['colorType'] );
        }

        function testPngGreyscaleColour() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'greyscale-png.png' );
                $this->assertEquals( 'greyscale-alpha', $meta['colorType'] );
        }

        function testPngGreyscaleNoAlphaColour() {
                $meta = PNGMetadataExtractor::getMetadata( $this->filePath .
                        'greyscale-na-png.png' );
                $this->assertEquals( 'greyscale', $meta['colorType'] );
        }

}