1--TEST--
2Apply imagegammacorrect() to a step wedge
3--SKIPIF--
4<?php
5if (!extension_loaded('gd')) die('skip gd extension not available');
6?>
7--FILE--
8<?php
9require __DIR__ . DIRECTORY_SEPARATOR . 'func.inc';
10
11test_gamma_both(1, 2);
12test_gamma_both(1, 1);
13test_gamma_both(2, 1);
14
15function test_gamma_both($in, $out)
16{
17    test_gamma($in, $out, 'imagecreate');
18    test_gamma($in, $out, 'imagecreatetruecolor');
19}
20
21function test_gamma($in, $out, $constructor)
22{
23    $im = $constructor(640, 480);
24    for ($j = 0; $j < 4; $j++) {
25        for ($i = 0; $i < 32; $i++) {
26            draw_cell($im, $i, $j);
27        }
28    }
29
30    imagegammacorrect($im, $in, $out);
31
32    $filename = __DIR__ . DIRECTORY_SEPARATOR
33        . "imagegammacorrect_variation2_{$in}_{$out}.png";
34    $kind = $constructor === 'imagecreate' ? 'palette' : 'truecolor';
35    echo "$kind gamma ($in, $out): ";
36    test_image_equals_file($filename, $im);
37}
38
39function draw_cell($im, $x, $y)
40{
41    $x1 = 20 * $x;
42    $y1 = 120 * $y;
43    $x2 = $x1 + 19;
44    $y2 = $y1 + 119;
45    $color = cell_color($im, $x, $y);
46    imagefilledrectangle($im, $x1,$y1, $x2,$y2, $color);
47}
48
49function cell_color($im, $x, $y)
50{
51    $channel = 8 * $x + 4;
52    switch ($y) {
53        case 0:
54            return imagecolorallocate($im, $channel, $channel, $channel);
55        case 1:
56            return imagecolorallocate($im, $channel, 0, 0);
57        case 2:
58            return imagecolorallocate($im, 0, $channel, 0);
59        case 3:
60            return imagecolorallocate($im, 0, 0, $channel);
61    }
62}
63?>
64--EXPECT--
65palette gamma (1, 2): The images are equal.
66truecolor gamma (1, 2): The images are equal.
67palette gamma (1, 1): The images are equal.
68truecolor gamma (1, 1): The images are equal.
69palette gamma (2, 1): The images are equal.
70truecolor gamma (2, 1): The images are equal.
71