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Fix test_image_equals_file() wrt. palette images

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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.
This commit is contained in:
Christoph M. Becker 2016-09-25 10:30:48 +02:00
parent c596b02a5b
commit c696bc8cfa
2 changed files with 63 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

23
ext/gd/tests/func.inc
View file

@ -82,7 +82,9 @@ function test_image_equals_file($filename, $actual)
save_actual_image($actual);
return;
}
$actual = test_to_truecolor($actual);
$expected = imagecreatefrompng($filename);
$expected = test_to_truecolor($expected);
$exp_x = imagesx($expected);
$exp_y = imagesy($expected);
$act_x = imagesx($actual);
@ -90,7 +92,6 @@ function test_image_equals_file($filename, $actual)
if ($exp_x != $act_x || $exp_y != $act_y) {
echo "The image size differs: expected {$exp_x}x{$exp_y}, got {$act_x}x{$act_y}.\n";
save_actual_image($actual);
imagedestroy($expected);
return;
}
$pixels_changed = 0;
@ -109,7 +110,25 @@ function test_image_equals_file($filename, $actual)
echo "The images differ in {$pixels_changed} pixels.\n";
save_actual_image($actual);
}
imagedestroy($expected);
}
/**
* Returns the truecolor version of an image.
*
* @param resource $image
* @return resource
*/
function test_to_truecolor($image)
{
if (imageistruecolor($image)) {
return $image;
} else {
$width = imagesx($image);
$height = imagesy($image);
$result = imagecreatetruecolor($width, $height);
imagecopy($result, $image, 0,0, 0,0, $width, $height);
return $result;
}
}
/**

42
ext/gd/tests/test_image_equals_file_palette.phpt Normal file
View file

@ -0,0 +1,42 @@
--TEST--
test_image_equals_file(): comparing palette images
--SKIPIF--
<?php
if (!extension_loaded('gd')) die('skip gd extension not available');
?>
--FILE--
<?php
require_once __DIR__ . DIRECTORY_SEPARATOR . 'func.inc';
$im = imagecreate(10, 10);
imagecolorallocate($im, 255, 255, 255);
$red = imagecolorallocate($im, 255, 0, 0);
imagefilledrectangle($im, 3,3, 7,7, $red);
$filename = __DIR__ . DIRECTORY_SEPARATOR . 'test_image_equals_file_palette.png';
imagepng($im, $filename);
$im = imagecreate(10, 10);
imagecolorallocate($im, 255, 255, 255);
$blue = imagecolorallocate($im, 0, 0, 255);
imagefilledrectangle($im, 3,3, 7,7, $blue);
test_image_equals_file($filename, $im);
$im = imagecreate(10, 10);
imagecolorallocate($im, 255, 255, 255);
imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
imagefilledrectangle($im, 3,3, 7,7, $red);
test_image_equals_file($filename, $im);
?>
===DONE===
--EXPECT--
The images differ in 25 pixels.
The images are equal.
===DONE===
--CLEAN--
<?php
unlink(__DIR__ . DIRECTORY_SEPARATOR . 'test_image_equals_file_palette.png');
?>