Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- <?php
- //Made by Chao Xu(Mgccl) 3/1/07
- //www.webdevlogs.com
- //V 1.0
- // Drupal code style and some restructuring by dopry. http://www.darrelopry.com
- define('IMG_FILTER_NEGATE', 0);
- define('IMG_FILTER_GRAYSCALE', 1);
- define('IMG_FILTER_BRIGHTNESS', 2);
- define('IMG_FILTER_CONTRAST', 3);
- define('IMG_FILTER_COLORIZE', 4);
- define('IMG_FILTER_EDGEDETECT', 5);
- define('IMG_FILTER_EMBOSS', 6);
- define('IMG_FILTER_GAUSSIAN_BLUR', 7);
- define('IMG_FILTER_SELECTIVE_BLUR', 8);
- define('IMG_FILTER_MEAN_REMOVAL', 9);
- define('IMG_FILTER_SMOOTH', 10);
- define('IMAGEAPI_IMAGEFILTER_PHP', 1);
- /**
- * walk each pixel in an image applying $callback to it.
- */
- function _imageapi_gd_pixel_color_walk(&$im, $callback, $arg1 = NULL, $arg2 = NULL, $arg3 = NULL, $arg4 = NULL) {
- $max_y = imagesy($im);
- $max_x = imagesx($im);
- for ($y=0; $y < $max_y; ++$y) {
- for ($x=0; $x < $max_x; ++$x) {
- $rgb = imagecolorat($im, $x, $y);
- $r = ($rgb >> 16) & 0xFF;
- $g = ($rgb >> 8) & 0xFF;
- $b = ($rgb & 0xFF);
- $a = $rgb >> 24;
- $callback($r, $g, $b, $a, $arg1, $arg2, $arg3, $arg4);
- // sanitize rgb values.
- $r = ($r > 255)? 255 : (($r < 0)? 0:$r);
- $g = ($g > 255)? 255 : (($g < 0)? 0:$g);
- $b = ($b > 255)? 255 : (($b < 0)? 0:$b);
- $a = ($a > 127)? 127 : (($a < 0)? 0:$a);
- if (!$color = imagecolorallocatealpha($im, $r, $g, $b, $a)) {
- $color = imagecolorclosestalpha($im, $r, $g, $b, $a);
- }
- imagesetpixel($im, $x, $y, $color);
- }
- }
- }
- function _imageapi_gd_pixel_negate(&$r, &$g, &$b, &$a) {
- $r = 255 - $r;
- $g = 255 - $g;
- $b = 255 - $b;
- }
- function _imageapi_gd_pixel_grayscale(&$r, &$g, &$b, &$a) {
- $r = round($r * 0.299 + $g * 0.587 + $b * 0.114);
- $g = $r;
- $b = $r;
- }
- function _imageapi_gd_pixel_brightness(&$r, &$g, &$b, &$a, $arg1) {
- $r += $arg1;
- $g += $arg1;
- $b += $arg1;
- }
- function _imageapi_gd_pixel_contrast(&$r, &$g, &$b, &$a, $contrast) {
- // normalize color value between -0.5 - 0.5
- // multiply by contrast value to accentuate positive/negative value.
- // denormalize to 0-255 range.
- $r = ((($r/255 - 0.5) * $contrast) + 0.5) * 255;
- $g = ((($g/255 - 0.5) * $contrast) + 0.5) * 255;
- $b = ((($b/255 - 0.5) * $contrast) + 0.5) * 255;
- }
- function _imageapi_gd_pixel_colorize(&$r, &$g, &$b, &$a, $arg1, $arg2, $arg3, $arg4) {
- $r += $arg1;
- $g += $arg2;
- $b += $arg3;
- }
- function imagefilter(&$im, $var, $arg1 = NULL, $arg2 = NULL, $arg3 = NULL, $arg4 = NULL) {
- switch ($var) {
- case IMG_FILTER_NEGATE:
- _imageapi_gd_pixel_color_walk($im, '_imageapi_gd_pixel_negate');
- return TRUE;
- case IMG_FILTER_GRAYSCALE:
- _imageapi_gd_pixel_color_walk($im, '_imageapi_gd_pixel_grayscale');
- return TRUE;
- case IMG_FILTER_BRIGHTNESS:
- _imageapi_gd_pixel_color_walk($im, '_imageapi_gd_pixel_brightness', $arg1);
- return TRUE;
- case IMG_FILTER_CONTRAST:
- // normalize between 0-1, square to keep positive.
- $contrast = pow((100-$arg1)/100, 2);
- _imageapi_gd_pixel_color_walk($im, '_imageapi_gd_pixel_contrast', $contrast);
- return TRUE;
- case IMG_FILTER_COLORIZE:
- $arg1 = (is_null($arg1)) ? 0 : $arg1;
- $arg2 = (is_null($arg2)) ? 0 : $arg2;
- $arg3 = (is_null($arg3)) ? 0 : $arg3;
- $arg4 = (is_null($arg4)) ? 0 : $arg4;
- _imageapi_gd_pixel_color_walk($im, '_imageapi_gd_pixel_colorize', $arg1, $arg2, $arg3, $arg4);
- return TRUE;
- case IMG_FILTER_EDGEDETECT:
- return imageconvolution($im, array(array(-1, 0, -1), array(0, 4, 0), array(-1, 0, -1)), 1, 127);
- case IMG_FILTER_EMBOSS:
- return imageconvolution($im, array(array(1.5, 0, 0), array(0, 0, 0), array(0, 0, -1.5)), 1, 127);
- case IMG_FILTER_GAUSSIAN_BLUR:
- return imageconvolution($im, array(array(1, 2, 1), array(2, 4, 2), array(1, 2, 1)), 16, 0);
- case IMG_FILTER_SELECTIVE_BLUR:
- for ($y = 0; $y<$max_y; ++$y) {
- for ($x = 0; $x<$max_x; ++$x) {
- $flt_r_sum = $flt_g_sum = $flt_b_sum = 0;
- $cpxl = imagecolorat($im, $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 {
- $pxl = imagecolorat($im, $x-(3>>1)+$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) {
- $pxl = imagecolorat($im, $x-(3>>1)+$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);
- $new_pxl = imagecolorallocatealpha($im, (int)$new_r, (int)$new_g, (int)$new_b, $new_a);
- if ($new_pxl == FALSE) {
- $new_pxl = imagecolorclosestalpha($im, (int)$new_r, (int)$new_g, (int)$new_b, $new_a);
- }
- imagesetpixel($im, $x, $y, $new_pxl);
- }
- }
- }
- }
- return TRUE;
- case IMG_FILTER_MEAN_REMOVAL:
- return imageconvolution($im, array(array(-1, -1, -1), array(-1, 9, -1), array(-1, -1, -1)), 1, 0);
- case IMG_FILTER_SMOOTH:
- return imageconvolution($im, array(array(1, 1, 1), array(1, $arg1, 1), array(1, 1, 1)), $arg1 + 8, 0);
- }
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement