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<?php
class PNGMetadataExtractorTest extends MediaWikiTestCase {
protected function setUp() {
parent::setUp();
$this->filePath = __DIR__ . '/../../data/media/';
}
/**
* Tests zTXt tag (compressed textual metadata)
*/
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'] );
}
/**
* Test tEXt tag (Uncompressed textual metadata)
*/
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'] );
}
/**
* tEXt tags must be encoded iso-8859-1 (vs iTXt which are utf-8)
* Make sure non-ascii characters get converted properly
*/
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'] );
}
/**
* Test extraction of pHYs tags, which can tell what the
* actual resolution of the image is (aka in dots per meter).
*/
/*
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
}
*/
/**
* Given a normal static PNG, check the animation metadata returned.
*/
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'] );
}
/**
* Given an animated APNG image file
* check it gets animated metadata right.
*/
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'] );
}
}
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