xref: /PHP-7.3/ext/gd/tests/bug75124.phpt (revision b0d3c1bf)
1--TEST--
2Bug #75124 (gdImageGrayScale() may produce colors)
3--SKIPIF--
4<?php
5if (!extension_loaded('gd')) die('skip gd extension not available');
6if (!GD_BUNDLED && version_compare(GD_VERSION, '2.2.5', '<')) {
7    die('skip only for bundled libgd or external libgd >= 2.2.5');
8}
9?>
10--FILE--
11<?php
12$im = imagecreatefrompng(__DIR__ . '/bug75124.png');
13var_dump(imageistruecolor($im));
14imagefilter($im, IMG_FILTER_GRAYSCALE);
15for ($i = 0, $width = imagesx($im); $i < $width; $i ++) {
16    for ($j = 0, $height = imagesy($im); $j < $height; $j++) {
17        $color = imagecolorat($im, $i, $j);
18        $red = ($color >> 16) & 0xff;
19        $green = ($color >> 8) & 0xff;
20        $blue = $color & 0xff;
21        if ($red != $green || $green != $blue) {
22            echo "non grayscale pixel detected\n";
23            break 2;
24        }
25    }
26}
27?>
28===DONE===
29--EXPECT--
30bool(true)
31===DONE===
32