PNGMetadataExtractorTest.php

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<?php

class PNGMetadataExtractorTest extends MediaWikiTestCase {

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

    public 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'] );
    }

    public 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'] );
    }

    public 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'] );
    }

    /*
    public 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
    }
    */

    public 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'] );
    }

    public 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 );
    }

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

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

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


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

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

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

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

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

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