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69 lines
1.8 KiB
PHP
69 lines
1.8 KiB
PHP
--TEST--
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Test for correct colors of imagecopyresampled() wrt. alpha
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--EXTENSIONS--
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gd
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--FILE--
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<?php
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const EXP_RED = 66;
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const EXP_GREEN = 66;
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const EXP_BLUE = 133;
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const EXP_ALPHA = 32;
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/* create the source image */
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$im = imagecreatetruecolor(10, 10);
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imagealphablending($im, false);
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$solid = imagecolorallocate($im, 0, 100, 150);
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$transparent = imagecolorallocatealpha($im, 200, 0, 100, 64);
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/* draw a checker pattern */
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for ($i = 0; $i < imagesx($im); $i++) {
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for ($j = 0; $j < imagesy($im); $j++) {
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imagesetpixel($im, $i, $j, ($i%2 != $j%2 ? $solid : $transparent));
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}
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}
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/* create the destination image */
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$copy = imagecreatetruecolor(5, 5);
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imagealphablending($copy, false);
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imagesavealpha($copy, true);
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imagecopyresampled($copy, $im, 0,0, 0,0, 5,5, 10, 10);
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/* assert all pixels have the same color */
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$color = imagecolorat($copy, 3, 3);
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for ($i = 0; $i < imagesx($copy); $i++) {
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for ($j = 0; $j < imagesy($copy); $j++) {
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if (imagecolorat($copy, $i, $j) != $color) {
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echo 'different pixel values', PHP_EOL;
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}
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}
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}
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/* assign actual component values */
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$red = ($color & 0xFF0000) >> 16;
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$green = ($color & 0x00FF00) >> 8;
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$blue = ($color & 0x0000FF);
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$alpha = ($color & 0x7F000000) >> 24;
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/* test for expected component values */
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if (!($red >= EXP_RED - 1 && $red <= EXP_RED + 1)) {
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printf("red: expected roughly %d, got %d\n", EXP_RED, $red);
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}
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if (!($green >= EXP_GREEN - 1 && $green <= EXP_GREEN + 1)) {
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printf("green: expected roughly %d, got %d\n", EXP_GREEN, $green);
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}
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if (!($blue >= EXP_BLUE - 1 && $blue <= EXP_BLUE + 1)) {
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printf("blue: expected roughly %d, got %d\n", EXP_BLUE, $blue);
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}
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if (!($alpha >= EXP_ALPHA - 1 && $alpha <= EXP_ALPHA + 1)) {
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printf("alpha: expected roughly %d, got %d\n", EXP_ALPHA, $alpha);
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}
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imagedestroy($copy);
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imagedestroy($im);
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echo 'DONE';
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?>
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--EXPECT--
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DONE
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