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- <?php
- /**
- * @file Include this file whenever you have to use imageconvolution.
- *
- * You can use in your project, but keep the comment below:
- * Great for any image manipulation library
- * Made by Chao Xu(Mgccl) 3/1/07
- * www.webdevlogs.com
- * V 1.0
- */
- if (!function_exists('imagefilter')) {
- /**
- * Applies a filter to an image.
- *
- * @link http://php.net/manual/en/function.imagefilter.php
- *
- * @param resource $image
- * @param int $filtertype
- * One of the IMG_FILTER_ constants
- * @param int $arg1
- * [optional] IMG_FILTER_BRIGHTNESS: Brightness level.
- * @param int $arg2
- * [optional] IMG_FILTER_COLORIZE: Value of green component.
- * @param int $arg3
- * [optional] IMG_FILTER_COLORIZE: Value of blue component.
- * param int $arg4
- * [optional] IMG_FILTER_COLORIZE: Alpha channel, A value between 0 and 127.
- * 0 indicates completely opaque while 127 indicates completely transparent.
- * This implementation does not use this parameter.
- *
- * @return bool
- * true on success or false on failure.
- */
- function imagefilter($image, $filtertype, $arg1 = NULL, $arg2 = NULL, $arg3 = NULL) {
- // define('IMAGE_FILTER_NEGATE', 0);
- // define('IMAGE_FILTER_GRAYSCALE', 1);
- // define('IMAGE_FILTER_BRIGHTNESS', 2);
- // define('IMAGE_FILTER_CONTRAST', 3);
- // define('IMAGE_FILTER_COLORIZE', 4);
- // define('IMAGE_FILTER_EDGEDETECT', 5);
- // define('IMAGE_FILTER_EMBOSS', 6);
- // define('IMAGE_FILTER_GAUSSIAN_BLUR', 7);
- // define('IMAGE_FILTER_SELECTIVE_BLUR', 8);
- // define('IMAGE_FILTER_MEAN_REMOVAL', 9);
- // define('IMAGE_FILTER_SMOOTH', 10);
- // define('IMG_FILTER_PIXELATE', 11);
- $max_y = imagesy($image);
- $max_x = imagesx($image);
- switch ($filtertype) {
- case 0:
- $y = 0;
- while ($y < $max_y) {
- $x = 0;
- while ($x < $max_x) {
- $rgb = imagecolorat($image, $x, $y);
- $r = 255 - (($rgb >> 16) & 0xFF);
- $g = 255 - (($rgb >> 8) & 0xFF);
- $b = 255 - ($rgb & 0xFF);
- $a = $rgb >> 24;
- $new_pxl = imagecolorallocatealpha($image, $r, $g, $b, $a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, $r, $g, $b, $a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return TRUE;
- case 1:
- $y = 0;
- while ($y < $max_y) {
- $x = 0;
- while ($x < $max_x) {
- $rgb = imagecolorat($image, $x, $y);
- $a = $rgb >> 24;
- $r = ((($rgb >> 16) & 0xFF) * 0.299) + ((($rgb >> 8) & 0xFF) * 0.587) + (($rgb & 0xFF) * 0.114);
- $new_pxl = imagecolorallocatealpha($image, $r, $r, $r, $a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, $r, $r, $r, $a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return TRUE;
- case 2:
- $y = 0;
- while ($y < $max_y) {
- $x = 0;
- while ($x < $max_x) {
- $rgb = imagecolorat($image, $x, $y);
- $r = (($rgb >> 16) & 0xFF) + $arg1;
- $g = (($rgb >> 8) & 0xFF) + $arg1;
- $b = ($rgb & 0xFF) + $arg1;
- $a = $rgb >> 24;
- $r = ($r > 255) ? 255 : (($r < 0) ? 0 : $r);
- $g = ($g > 255) ? 255 : (($g < 0) ? 0 : $g);
- $b = ($b > 255) ? 255 : (($b < 0) ? 0 : $b);
- $new_pxl = imagecolorallocatealpha($image, $r, $g, $b, $a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, $r, $g, $b, $a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return TRUE;
- case 3:
- $contrast = pow((100 - $arg1) / 100, 2);
- $y = 0;
- while ($y < $max_y) {
- $x = 0;
- while ($x < $max_x) {
- $rgb = imagecolorat($image, $x, $y);
- $a = $rgb >> 24;
- $r = (((((($rgb >> 16) & 0xFF) / 255) - 0.5) * $contrast) + 0.5) * 255;
- $g = (((((($rgb >> 8) & 0xFF) / 255) - 0.5) * $contrast) + 0.5) * 255;
- $b = ((((($rgb & 0xFF) / 255) - 0.5) * $contrast) + 0.5) * 255;
- $r = ($r > 255) ? 255 : (($r < 0) ? 0 : $r);
- $g = ($g > 255) ? 255 : (($g < 0) ? 0 : $g);
- $b = ($b > 255) ? 255 : (($b < 0) ? 0 : $b);
- $new_pxl = imagecolorallocatealpha($image, $r, $g, $b, $a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, $r, $g, $b, $a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return TRUE;
- case 4:
- $x = 0;
- while ($x < $max_x) {
- $y = 0;
- while ($y < $max_y) {
- $rgb = imagecolorat($image, $x, $y);
- $r = (($rgb >> 16) & 0xFF) + $arg1;
- $g = (($rgb >> 8) & 0xFF) + $arg2;
- $b = ($rgb & 0xFF) + $arg3;
- $a = $rgb >> 24;
- $r = ($r > 255) ? 255 : (($r < 0) ? 0 : $r);
- $g = ($g > 255) ? 255 : (($g < 0) ? 0 : $g);
- $b = ($b > 255) ? 255 : (($b < 0) ? 0 : $b);
- $new_pxl = imagecolorallocatealpha($image, $r, $g, $b, $a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, $r, $g, $b, $a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- ++$y;
- }
- ++$x;
- }
- return TRUE;
- case 5:
- return imageconvolution($image, array(
- array(-1, 0, -1),
- array(0, 4, 0),
- array(-1, 0, -1),
- ), 1, 127);
- case 6:
- return imageconvolution($image, array(
- array(1.5, 0, 0),
- array(0, 0, 0),
- array(0, 0, -1.5),
- ), 1, 127);
- case 7:
- return imageconvolution($image, array(
- array(1, 2, 1),
- array(2, 4, 2),
- array(1, 2, 1),
- ), 16, 0);
- case 8:
- for ($y = 0; $y < $max_y; $y++) {
- for ($x = 0; $x < $max_x; $x++) {
- $flt_r_sum = $flt_g_sum = $flt_b_sum = 0;
- $cpxl = imagecolorat($image, $x, $y);
- for ($j = 0; $j < 3; $j++) {
- for ($i = 0; $i < 3; $i++) {
- if (($j == 1) && ($i == 1)) {
- $flt_r[1][1] = $flt_g[1][1] = $flt_b[1][1] = 0.5;
- }
- else {
- $pxl = imagecolorat($image, $x - (3 >> 1) + $i, $y - (3 >> 1) + $j);
- $new_a = $pxl >> 24;
- // $r = (($pxl >> 16) & 0xFF);
- // $g = (($pxl >> 8) & 0xFF);
- // $b = ($pxl & 0xFF);
- $new_r = abs((($cpxl >> 16) & 0xFF) - (($pxl >> 16) & 0xFF));
- if ($new_r != 0) {
- $flt_r[$j][$i] = 1 / $new_r;
- }
- else {
- $flt_r[$j][$i] = 1;
- }
- $new_g = abs((($cpxl >> 8) & 0xFF) - (($pxl >> 8) & 0xFF));
- if ($new_g != 0) {
- $flt_g[$j][$i] = 1 / $new_g;
- }
- else {
- $flt_g[$j][$i] = 1;
- }
- $new_b = abs(($cpxl & 0xFF) - ($pxl & 0xFF));
- if ($new_b != 0) {
- $flt_b[$j][$i] = 1 / $new_b;
- }
- else {
- $flt_b[$j][$i] = 1;
- }
- }
- $flt_r_sum += $flt_r[$j][$i];
- $flt_g_sum += $flt_g[$j][$i];
- $flt_b_sum += $flt_b[$j][$i];
- }
- }
- for ($j = 0; $j < 3; $j++) {
- for ($i = 0; $i < 3; $i++) {
- if ($flt_r_sum != 0) {
- $flt_r[$j][$i] /= $flt_r_sum;
- }
- if ($flt_g_sum != 0) {
- $flt_g[$j][$i] /= $flt_g_sum;
- }
- if ($flt_b_sum != 0) {
- $flt_b[$j][$i] /= $flt_b_sum;
- }
- }
- }
- $new_r = $new_g = $new_b = 0;
- for ($j = 0; $j < 3; $j++) {
- for ($i = 0; $i < 3; $i++) {
- $pxl = imagecolorat($image, $x - (3 >> 1) + $i, $y - (3 >> 1) + $j);
- $new_r += (($pxl >> 16) & 0xFF) * $flt_r[$j][$i];
- $new_g += (($pxl >> 8) & 0xFF) * $flt_g[$j][$i];
- $new_b += ($pxl & 0xFF) * $flt_b[$j][$i];
- }
- }
- $new_r = ($new_r > 255) ? 255 : (($new_r < 0) ? 0 : $new_r);
- $new_g = ($new_g > 255) ? 255 : (($new_g < 0) ? 0 : $new_g);
- $new_b = ($new_b > 255) ? 255 : (($new_b < 0) ? 0 : $new_b);
- $new_pxl = imagecolorallocatealpha($image, (int) $new_r, (int) $new_g, (int) $new_b, $new_a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($image, (int) $new_r, (int) $new_g, (int) $new_b, $new_a);
- }
- imagesetpixel($image, $x, $y, $new_pxl);
- }
- }
- return TRUE;
- case 9:
- return imageconvolution($image, array(
- array(-1, -1, -1),
- array(-1, 9, -1),
- array(-1, -1, -1),
- ), 1, 0);
- case 10:
- return imageconvolution($image, array(
- array(1, 1, 1),
- array(1, $arg1, 1),
- array(1, 1, 1),
- ), $arg1 + 8, 0);
- case 11:
- default:
- watchdog('imagecache_actions', 'Image filter failed: unknown filter type: %filtertype',
- array('%filtertype' => $filtertype),
- WATCHDOG_ERROR);
- return FALSE;
- }
- }
- }
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