diff options
author | Christoph M. Becker <cmb@php.net> | 2015-07-19 23:03:02 +0200 |
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committer | Christoph M. Becker <cmb@php.net> | 2015-07-19 23:05:07 +0200 |
commit | 90de2aeaac3de8f0744853ba197457c2241a4bdf (patch) | |
tree | 29c785a23dcf184e08d6d11c04099696a32de468 | |
parent | 4b2d025937769d383e6a842a90658c58f10d5794 (diff) | |
download | php-git-90de2aeaac3de8f0744853ba197457c2241a4bdf.tar.gz |
Added basic test for imagewebp() and imagecreatefromwebp()
-rw-r--r-- | ext/gd/tests/similarity.inc | 64 | ||||
-rw-r--r-- | ext/gd/tests/webp_basic.phpt | 35 |
2 files changed, 99 insertions, 0 deletions
diff --git a/ext/gd/tests/similarity.inc b/ext/gd/tests/similarity.inc new file mode 100644 index 0000000000..cb0dba77f2 --- /dev/null +++ b/ext/gd/tests/similarity.inc @@ -0,0 +1,64 @@ +<?php + +/** + * A very simple algorithm for finding the dissimilarity between images, + * mainly useful for checking lossy compression. + */ + +/** + * Gets the individual components of an RGB value. + * + * @param int $color + * @param int $red + * @param int $green + * @param int $blue + * + * @return void + */ +function get_rgb($color, &$red, &$green, &$blue) +{ + // assumes $color is an RGB value + $red = ($color >> 16) & 0xFF; + $green = ($color >> 8) & 0xFF; + $blue = $color & 0xFF; +} + +/** + * Calculates the euclidean distance of two RGB values. + * + * @param int $color1 + * @param int $color2 + * + * @return int + */ +function calc_pixel_distance($color1, $color2) +{ + get_rgb($color1, $red1, $green1, $blue1); + get_rgb($color2, $red2, $green2, $blue2); + return sqrt( + pow($red1 - $red2, 2) + pow($green1 - $green2, 2) + pow($blue1 - $blue2, 2) + ); +} + +/** + * Calculates dissimilarity of two images. + * + * @param resource $image1 + * @param resource $image2 + * + * @return int The dissimilarity. 0 means the images are identical. The higher + * the value, the more dissimilar are the images. + */ +function calc_image_dissimilarity($image1, $image2) +{ + // assumes image1 and image2 have same width and height + $dissimilarity = 0; + for ($i = 0, $n = imagesx($image1); $i < $n; $i++) { + for ($j = 0, $m = imagesy($image1); $j < $m; $j++) { + $color1 = imagecolorat($image1, $i, $j); + $color2 = imagecolorat($image2, $i, $j); + $dissimilarity += calc_pixel_distance($color1, $color2); + } + } + return $dissimilarity; +} diff --git a/ext/gd/tests/webp_basic.phpt b/ext/gd/tests/webp_basic.phpt new file mode 100644 index 0000000000..75933a9ca4 --- /dev/null +++ b/ext/gd/tests/webp_basic.phpt @@ -0,0 +1,35 @@ +--TEST--
+imagewebp() and imagecreatefromwebp() - basic test
+--SKIPIF--
+<?php
+if (!extension_loaded('gd')) die('skip gd extension not available');
+if (!function_exists('imagewebp') || !function_exists('imagecreatefromwebp'))
+ die('skip WebP support not available');
+?>
+--FILE--
+<?php
+require_once __DIR__ . '/similarity.inc';
+
+$filename = __DIR__ . '/webp_basic.webp';
+
+$im1 = imagecreatetruecolor(75, 75);
+$white = imagecolorallocate($im1, 255, 255, 255);
+$red = imagecolorallocate($im1, 255, 0, 0);
+$green = imagecolorallocate($im1, 0, 255, 0);
+$blue = imagecolorallocate($im1, 0, 0, 255);
+imagefilledrectangle($im1, 0, 0, 74, 74, $white);
+imageline($im1, 3, 3, 71, 71, $red);
+imageellipse($im1, 18, 54, 36, 36, $green);
+imagerectangle($im1, 41, 3, 71, 33, $blue);
+imagewebp($im1, $filename);
+
+$im2 = imagecreatefromwebp($filename);
+imagewebp($im2, $filename);
+var_dump(calc_image_dissimilarity($im1, $im2) < 10e5);
+?>
+--CLEAN--
+<?php
+@unlink(__DIR__ . '/webp_basic.webp');
+?>
+--EXPECT--
+bool(true)
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