mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-01 23:37:43 +02:00
138 lines
4.1 KiB
PHP
138 lines
4.1 KiB
PHP
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<?php
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/**
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* Tests for the {@link GD} class.
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*
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* @package framework
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* @subpackage tests
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*/
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class GDTest extends SapphireTest {
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public static $filenames = array(
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'gif' => 'test_gif.gif',
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'jpg' => 'test_jpg.jpg',
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'png8' => 'test_png8.png',
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'png32' => 'test_png32.png'
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);
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/**
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* Loads all images into an associative array of GD objects.
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* Optionally applies an operation to each GD
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* @param callable $callback Action to perform on each GD
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* @return array List of GD
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*/
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protected function applyToEachImage($callback = null) {
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$gds = array();
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foreach(self::$filenames as $type => $file) {
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$fullPath = realpath(dirname(__FILE__) . '/gdtest/' . $file);
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$gd = new GD($fullPath);
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if($callback) {
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$gd = $callback($gd);
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}
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$gds[$type] = $gd;
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}
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return $gds;
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}
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/**
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* Takes samples from the given GD at 5 pixel increments
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* @param GD $gd The source image
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* @param integer $horizontal Number of samples to take horizontally
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* @param integer $vertical Number of samples to take vertically
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* @return array List of colours for each sample, each given as an associative
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* array with red, blue, green, and alpha components
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*/
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protected function sampleAreas(GD $gd, $horizontal = 4, $vertical = 4) {
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$samples = array();
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for($y = 0; $y < $vertical; $y++) {
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for($x = 0; $x < $horizontal; $x++) {
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$colour = imagecolorat($gd->getGD(), $x * 5, $y * 5);
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$samples[] = ImageColorsforIndex($gd->getGD(), $colour);
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}
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}
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return $samples;
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}
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/**
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* Asserts that two colour channels are equivalent within a given tolerance range
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* @param integer $expected
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* @param integer $actual
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* @param integer $tolerance
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*/
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protected function assertColourEquals($expected, $actual, $tolerance = 0) {
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$match =
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($expected + $tolerance >= $actual) &&
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($expected - $tolerance <= $actual);
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$this->assertTrue($match);
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}
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/**
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* Asserts that all samples given correctly correspond to a greyscale version
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* of the test image pattern
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* @param array $samples List of 16 colour samples representing each of the
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* 8 x 8 squares on the image pattern
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* @param int $alphaBits Depth of alpha channel in bits
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* @param int $tolerance Reasonable tolerance level for colour comparison
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*/
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protected function assertGreyscale($samples, $alphaBits = 0, $tolerance = 0) {
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// Check that all colour samples match
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foreach($samples as $sample) {
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$matches =
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($sample['red'] === $sample['green']) &&
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($sample['blue'] === $sample['green']);
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$this->assertTrue($matches, 'Assert colour is greyscale');
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if(!$matches) return;
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}
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// check various sample points
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$this->assertColourEquals(96, $samples[0]['red'], $tolerance);
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$this->assertColourEquals(91, $samples[2]['red'], $tolerance);
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$this->assertColourEquals(0, $samples[8]['red'], $tolerance);
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$this->assertColourEquals(127, $samples[9]['red'], $tolerance);
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// check alpha of various points
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switch($alphaBits) {
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case 0:
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$this->assertColourEquals(0, $samples[2]['alpha'], $tolerance);
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$this->assertColourEquals(0, $samples[12]['alpha'], $tolerance);
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break;
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case 1:
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$this->assertColourEquals(0, $samples[2]['alpha'], $tolerance);
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$this->assertColourEquals(127, $samples[12]['alpha'], $tolerance);
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break;
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default:
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$this->assertColourEquals(63, $samples[2]['alpha'], $tolerance);
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$this->assertColourEquals(127, $samples[12]['alpha'], $tolerance);
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break;
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}
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}
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/**
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* Tests that images are correctly transformed to greyscale
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*/
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function testGreyscale() {
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// Apply greyscaling to each image
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$images = $this->applyToEachImage(function(GD $gd) {
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return $gd->greyscale();
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});
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// Test GIF (256 colour, transparency)
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$samplesGIF = $this->sampleAreas($images['gif']);
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$this->assertGreyscale($samplesGIF, 1);
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// Test JPG
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$samplesJPG = $this->sampleAreas($images['jpg']);
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$this->assertGreyscale($samplesJPG, 0, 4);
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// Test PNG 8 (indexed with alpha transparency)
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$samplesPNG8 = $this->sampleAreas($images['png8']);
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$this->assertGreyscale($samplesPNG8, 8, 4);
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// Test PNG 32 (full alpha transparency)
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$samplesPNG32 = $this->sampleAreas($images['png32']);
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$this->assertGreyscale($samplesPNG32, 8);
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}
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}
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