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<?php
if (!function_exists('imagefilter')) {
function imagefilter($source, $var, $arg1 = null, $arg2 = null, $arg3 = null) {
$max_y = imagesy($source);
$max_x = imagesx($source);
switch ($var) {
case 0:
$y = 0;
while ($y < $max_y) {
$x = 0;
while ($x < $max_x) {
$rgb = imagecolorat($source, $x, $y);
$r = 255 - ($rgb >> 16 & 0xff);
$g = 255 - ($rgb >> 8 & 0xff);
$b = 255 - ($rgb & 0xff);
$a = $rgb >> 24;
$new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
}
imagesetpixel($source, $x, $y, $new_pxl);
++$x;
}
++$y;
}
return true;
break;
case 1:
$y = 0;
while ($y < $max_y) {
$x = 0;
while ($x < $max_x) {
$rgb = imagecolorat($source, $x, $y);
$a = $rgb >> 24;
$r = ($rgb >> 16 & 0xff) * 0.299 + ($rgb >> 8 & 0xff) * 0.587 + ($rgb & 0xff) * 0.114;
$new_pxl = imagecolorallocatealpha($source, $r, $r, $r, $a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, $r, $r, $r, $a);
}
imagesetpixel($source, $x, $y, $new_pxl);
++$x;
}
++$y;
}
return true;
break;
case 2:
$y = 0;
while ($y < $max_y) {
$x = 0;
while ($x < $max_x) {
$rgb = imagecolorat($source, $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);
$new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
}
imagesetpixel($source, $x, $y, $new_pxl);
++$x;
}
++$y;
}
return true;
break;
case 3:
$contrast = pow((100 - $arg1) / 100, 2);
$y = 0;
while ($y < $max_y) {
$x = 0;
while ($x < $max_x) {
$rgb = imagecolorat($source, $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);
$new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
}
imagesetpixel($source, $x, $y, $new_pxl);
++$x;
}
++$y;
}
return true;
break;
case 4:
$x = 0;
while ($x < $max_x) {
$y = 0;
while ($y < $max_y) {
$rgb = imagecolorat($source, $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);
$new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
}
imagesetpixel($source, $x, $y, $new_pxl);
++$y;
}
++$x;
}
return true;
break;
case 5:
return imageconvolution($source, array(
array(
-1,
0,
-1,
),
array(
0,
4,
0,
),
array(
-1,
0,
-1,
),
), 1, 127);
break;
case 6:
return imageconvolution($source, array(
array(
1.5,
0,
0,
),
array(
0,
0,
0,
),
array(
0,
0,
-1.5,
),
), 1, 127);
break;
case 7:
return imageconvolution($source, array(
array(
1,
2,
1,
),
array(
2,
4,
2,
),
array(
1,
2,
1,
),
), 16, 0);
break;
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;
$cpxl = imagecolorat($source, $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 {
$pxl = imagecolorat($source, $x - (3 >> 1) + $i, $y - (3 >> 1) + $j);
$new_a = $pxl >> 24;
$new_r = abs(($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++) {
$pxl = imagecolorat($source, $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);
$new_pxl = imagecolorallocatealpha($source, (int) $new_r, (int) $new_g, (int) $new_b, $new_a);
if ($new_pxl == false) {
$new_pxl = imagecolorclosestalpha($source, (int) $new_r, (int) $new_g, (int) $new_b, $new_a);
}
imagesetpixel($source, $x, $y, $new_pxl);
}
}
return true;
break;
case 9:
return imageconvolution($source, array(
array(
-1,
-1,
-1,
),
array(
-1,
9,
-1,
),
array(
-1,
-1,
-1,
),
), 1, 0);
break;
case 10:
return imageconvolution($source, array(
array(
1,
1,
1,
),
array(
1,
$arg1,
1,
),
array(
1,
1,
1,
),
), $arg1 + 8, 0);
break;
}
}
}
