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c696bc8cfa
The recently introduced test_image_equals_file() doesn't properly work for palette images, because in this case only the palette indexes are compared, what can lead to false positives and negatives as shown in the added test. To fix that we convert palette images to truecolor, what is supposed to be faster than calling imagecolorsforindex() for each pixel. We furthermore rely on PHP's refcounting to free unused images; after all, this is not C.
148 lines
3.3 KiB
PHP
148 lines
3.3 KiB
PHP
<?php
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function get_gd_version()
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{
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return GD_VERSION;
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}
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function get_php_info()
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{
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ob_start();
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phpinfo();
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$info = ob_get_contents();
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ob_end_clean();
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return $info;
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}
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function get_freetype_version()
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{
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$version = 0;
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if (preg_match(',FreeType Version => (\d+\.\d+\.\d+),s', get_php_info(), $match)) {
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$version = $match[1];
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}
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return $version;
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}
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function get_libjpeg_version()
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{
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$version = 0;
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if (preg_match(',libJPEG Version => ([a-z0-9]+),s', get_php_info(), $match)) {
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$version = $match[1];
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}
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return $version;
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}
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function get_libpng_version()
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{
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$version = 0;
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if (preg_match(',libPNG Version => (\d+\.\d+\.\d+),s', get_php_info(), $match)) {
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$version = $match[1];
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}
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return $version;
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}
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function get_libxpm_version()
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{
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$version = 0;
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if (preg_match(',libXpm Version => (\d+),s', get_php_info(), $match)) {
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$version = $match[1];
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}
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return $version;
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}
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/**
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* Tests that an in-memory image equals a PNG file.
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*
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* It checks for equal image sizes, and whether any pixels are different.
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* The textual result is printed, so the EXPECT section should contain the line
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* "The images are equal."
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*
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* If the PNG file does not exists, or the images are not equal, a diagnostic
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* message is printed, and the actual file is stored right beside the temporary
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* .php test file with the extension .out.png, to be able to manually inspect
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* the result.
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*
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* @param string $filename
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* @param resource $actual
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* @return void
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*/
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function test_image_equals_file($filename, $actual)
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{
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if (!file_exists($filename)) {
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echo "The expected image does not exist.\n";
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save_actual_image($actual);
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return;
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}
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$actual = test_to_truecolor($actual);
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$expected = imagecreatefrompng($filename);
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$expected = test_to_truecolor($expected);
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$exp_x = imagesx($expected);
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$exp_y = imagesy($expected);
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$act_x = imagesx($actual);
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$act_y = imagesy($actual);
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if ($exp_x != $act_x || $exp_y != $act_y) {
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echo "The image size differs: expected {$exp_x}x{$exp_y}, got {$act_x}x{$act_y}.\n";
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save_actual_image($actual);
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return;
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}
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$pixels_changed = 0;
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for ($y = 0; $y < $exp_y; $y++) {
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for ($x = 0; $x < $exp_x; $x ++) {
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$exp_c = imagecolorat($expected, $x, $y);
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$act_c = imagecolorat($actual, $x, $y);
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if ($exp_c != $act_c) {
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$pixels_changed++;
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}
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}
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}
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if (!$pixels_changed) {
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echo "The images are equal.\n";
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} else {
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echo "The images differ in {$pixels_changed} pixels.\n";
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save_actual_image($actual);
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}
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}
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/**
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* Returns the truecolor version of an image.
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*
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* @param resource $image
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* @return resource
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*/
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function test_to_truecolor($image)
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{
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if (imageistruecolor($image)) {
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return $image;
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} else {
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$width = imagesx($image);
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$height = imagesy($image);
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$result = imagecreatetruecolor($width, $height);
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imagecopy($result, $image, 0,0, 0,0, $width, $height);
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return $result;
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}
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}
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/**
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* Saves an actual image to disk.
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*
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* The image is saved right beside the temporary .php test file with the
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* extension .out.png.
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*
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* @param resource $image
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* @return void
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*/
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function save_actual_image($image)
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{
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$pathinfo = pathinfo($_SERVER['SCRIPT_FILENAME']);
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$filename = "{$pathinfo['dirname']}/{$pathinfo['filename']}.out.png";
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imagepng($image, $filename);
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}
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