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phpthumb.filters.php
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phpthumb.filters.php
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<?php
//////////////////////////////////////////////////////////////
// phpThumb() by James Heinrich <[email protected]> //
// available at http://phpthumb.sourceforge.net //
// and/or https://github.com/JamesHeinrich/phpThumb //
//////////////////////////////////////////////////////////////
/// //
// phpthumb.filters.php - image processing filter functions //
// ///
//////////////////////////////////////////////////////////////
class phpthumb_filters {
/**
* @var phpthumb
*/
public $phpThumbObject = null;
public function DebugMessage($message, $file='', $line='') {
if (is_object($this->phpThumbObject)) {
return $this->phpThumbObject->DebugMessage($message, $file, $line);
}
return false;
}
public function ApplyMask(&$gdimg_mask, &$gdimg_image) {
if (phpthumb_functions::gd_version() < 2) {
$this->DebugMessage('Skipping ApplyMask() because gd_version is "'.phpthumb_functions::gd_version().'"', __FILE__, __LINE__);
return false;
}
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '4.3.2', '>=')) {
$this->DebugMessage('Using alpha ApplyMask() technique', __FILE__, __LINE__);
if ($gdimg_mask_resized = phpthumb_functions::ImageCreateFunction(imagesx($gdimg_image), imagesy($gdimg_image))) {
imagecopyresampled($gdimg_mask_resized, $gdimg_mask, 0, 0, 0, 0, imagesx($gdimg_image), imagesy($gdimg_image), imagesx($gdimg_mask), imagesy($gdimg_mask));
if ($gdimg_mask_blendtemp = phpthumb_functions::ImageCreateFunction(imagesx($gdimg_image), imagesy($gdimg_image))) {
$color_background = imagecolorallocate($gdimg_mask_blendtemp, 0, 0, 0);
imagefilledrectangle($gdimg_mask_blendtemp, 0, 0, imagesx($gdimg_mask_blendtemp), imagesy($gdimg_mask_blendtemp), $color_background);
imagealphablending($gdimg_mask_blendtemp, false);
imagesavealpha($gdimg_mask_blendtemp, true);
for ($x = 0, $xMax = imagesx($gdimg_image); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg_image); $y < $yMax; $y++) {
//$RealPixel = phpthumb_functions::GetPixelColor($gdimg_mask_blendtemp, $x, $y);
$RealPixel = phpthumb_functions::GetPixelColor($gdimg_image, $x, $y);
$MaskPixel = phpthumb_functions::GrayscalePixel(phpthumb_functions::GetPixelColor($gdimg_mask_resized, $x, $y));
$MaskAlpha = 127 - (floor($MaskPixel['red'] / 2) * (1 - ($RealPixel['alpha'] / 127)));
$newcolor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_mask_blendtemp, $RealPixel['red'], $RealPixel['green'], $RealPixel['blue'], $MaskAlpha);
imagesetpixel($gdimg_mask_blendtemp, $x, $y, $newcolor);
}
}
imagealphablending($gdimg_image, false);
imagesavealpha($gdimg_image, true);
imagecopy($gdimg_image, $gdimg_mask_blendtemp, 0, 0, 0, 0, imagesx($gdimg_mask_blendtemp), imagesy($gdimg_mask_blendtemp));
imagedestroy($gdimg_mask_blendtemp);
} else {
$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
}
imagedestroy($gdimg_mask_resized);
} else {
$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
}
} else {
// alpha merging requires PHP v4.3.2+
$this->DebugMessage('Skipping ApplyMask() technique because PHP is v"'. PHP_VERSION .'"', __FILE__, __LINE__);
}
return true;
}
public function Bevel(&$gdimg, $width, $hexcolor1, $hexcolor2) {
$width = ($width ? $width : 5);
$hexcolor1 = ($hexcolor1 ? $hexcolor1 : 'FFFFFF');
$hexcolor2 = ($hexcolor2 ? $hexcolor2 : '000000');
imagealphablending($gdimg, true);
for ($i = 0; $i < $width; $i++) {
$alpha = round(($i / $width) * 127);
$color1 = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor1, false, $alpha);
$color2 = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor2, false, $alpha);
imageline($gdimg, $i, $i + 1, $i, imagesy($gdimg) - $i - 1, $color1); // left
imageline($gdimg, $i, $i , imagesx($gdimg) - $i, $i , $color1); // top
imageline($gdimg, imagesx($gdimg) - $i, imagesy($gdimg) - $i - 1, imagesx($gdimg) - $i, $i + 1, $color2); // right
imageline($gdimg, imagesx($gdimg) - $i, imagesy($gdimg) - $i , $i, imagesy($gdimg) - $i , $color2); // bottom
}
return true;
}
public function Blur(&$gdimg, $radius=0.5) {
// Taken from Torstein Hønsi's phpUnsharpMask (see phpthumb.unsharp.php)
$radius = round(max(0, min($radius, 50)) * 2);
if (!$radius) {
return false;
}
$w = imagesx($gdimg);
$h = imagesy($gdimg);
if ($imgBlur = imagecreatetruecolor($w, $h)) {
// Gaussian blur matrix:
// 1 2 1
// 2 4 2
// 1 2 1
// Move copies of the image around one pixel at the time and merge them with weight
// according to the matrix. The same matrix is simply repeated for higher radii.
for ($i = 0; $i < $radius; $i++) {
imagecopy ($imgBlur, $gdimg, 0, 0, 1, 1, $w - 1, $h - 1); // up left
imagecopymerge($imgBlur, $gdimg, 1, 1, 0, 0, $w, $h, 50.00000); // down right
imagecopymerge($imgBlur, $gdimg, 0, 1, 1, 0, $w - 1, $h, 33.33333); // down left
imagecopymerge($imgBlur, $gdimg, 1, 0, 0, 1, $w, $h - 1, 25.00000); // up right
imagecopymerge($imgBlur, $gdimg, 0, 0, 1, 0, $w - 1, $h, 33.33333); // left
imagecopymerge($imgBlur, $gdimg, 1, 0, 0, 0, $w, $h, 25.00000); // right
imagecopymerge($imgBlur, $gdimg, 0, 0, 0, 1, $w, $h - 1, 20.00000); // up
imagecopymerge($imgBlur, $gdimg, 0, 1, 0, 0, $w, $h, 16.666667); // down
imagecopymerge($imgBlur, $gdimg, 0, 0, 0, 0, $w, $h, 50.000000); // center
imagecopy ($gdimg, $imgBlur, 0, 0, 0, 0, $w, $h);
}
return true;
}
return false;
}
public function BlurGaussian(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_GAUSSIAN_BLUR)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_GAUSSIAN_BLUR)', __FILE__, __LINE__);
// fall through and try it the hard way
}
$this->DebugMessage('FAILED: phpthumb_filters::BlurGaussian($gdimg) [using phpthumb_filters::Blur() instead]', __FILE__, __LINE__);
return $this->Blur($gdimg, 0.5);
}
public function BlurSelective(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_SELECTIVE_BLUR)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_SELECTIVE_BLUR)', __FILE__, __LINE__);
// fall through and try it the hard way
}
// currently not implemented "the hard way"
$this->DebugMessage('FAILED: phpthumb_filters::BlurSelective($gdimg) [function not implemented]', __FILE__, __LINE__);
return false;
}
public function Brightness(&$gdimg, $amount=0) {
if ($amount == 0) {
return true;
}
$amount = max(-255, min(255, $amount));
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_BRIGHTNESS, $amount)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_BRIGHTNESS, '.$amount.')', __FILE__, __LINE__);
// fall through and try it the hard way
}
$scaling = (255 - abs($amount)) / 255;
$baseamount = (($amount > 0) ? $amount : 0);
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$NewPixel = array();
foreach ($OriginalPixel as $key => $value) {
$NewPixel[$key] = round($baseamount + ($OriginalPixel[$key] * $scaling));
}
$newColor = imagecolorallocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function Contrast(&$gdimg, $amount=0) {
if ($amount == 0) {
return true;
}
$amount = max(-255, min(255, $amount));
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
// imagefilter(IMG_FILTER_CONTRAST) has range +100 to -100 (positive numbers make it darker!)
$amount = ($amount / 255) * -100;
if (imagefilter($gdimg, IMG_FILTER_CONTRAST, $amount)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_CONTRAST, '.$amount.')', __FILE__, __LINE__);
// fall through and try it the hard way
}
if ($amount > 0) {
$scaling = 1 + ($amount / 255);
} else {
$scaling = (255 - abs($amount)) / 255;
}
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$NewPixel = array();
foreach ($OriginalPixel as $key => $value) {
$NewPixel[$key] = min(255, max(0, round($OriginalPixel[$key] * $scaling)));
}
$newColor = imagecolorallocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function Colorize(&$gdimg, $amount, $targetColor) {
$amount = (is_numeric($amount) ? $amount : 25);
$amountPct = $amount / 100;
$targetColor = (phpthumb_functions::IsHexColor($targetColor) ? $targetColor : 'gray');
if ($amount == 0) {
return true;
}
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if ($targetColor == 'gray') {
$targetColor = '808080';
}
$r = round($amountPct * hexdec(substr($targetColor, 0, 2)));
$g = round($amountPct * hexdec(substr($targetColor, 2, 2)));
$b = round($amountPct * hexdec(substr($targetColor, 4, 2)));
if (imagefilter($gdimg, IMG_FILTER_COLORIZE, $r, $g, $b)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_COLORIZE)', __FILE__, __LINE__);
// fall through and try it the hard way
}
// overridden below for grayscale
$TargetPixel = array();
if ($targetColor != 'gray') {
$TargetPixel['red'] = hexdec(substr($targetColor, 0, 2));
$TargetPixel['green'] = hexdec(substr($targetColor, 2, 2));
$TargetPixel['blue'] = hexdec(substr($targetColor, 4, 2));
}
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
if ($targetColor == 'gray') {
$TargetPixel = phpthumb_functions::GrayscalePixel($OriginalPixel);
}
$NewPixel = array();
foreach ($TargetPixel as $key => $value) {
$NewPixel[$key] = round(max(0, min(255, ($OriginalPixel[$key] * ((100 - $amount) / 100)) + ($TargetPixel[$key] * $amountPct))));
}
//$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue'], $OriginalPixel['alpha']);
$newColor = imagecolorallocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function Crop(&$gdimg, $left=0, $right=0, $top=0, $bottom=0) {
if (!$left && !$right && !$top && !$bottom) {
return true;
}
$oldW = imagesx($gdimg);
$oldH = imagesy($gdimg);
if (($left > 0) && ($left < 1)) { $left = round($left * $oldW); }
if (($right > 0) && ($right < 1)) { $right = round($right * $oldW); }
if (($top > 0) && ($top < 1)) { $top = round($top * $oldH); }
if (($bottom > 0) && ($bottom < 1)) { $bottom = round($bottom * $oldH); }
$right = min($oldW - $left - 1, $right);
$bottom = min($oldH - $top - 1, $bottom);
$newW = $oldW - $left - $right;
$newH = $oldH - $top - $bottom;
if ($imgCropped = imagecreatetruecolor($newW, $newH)) {
imagecopy($imgCropped, $gdimg, 0, 0, $left, $top, $newW, $newH);
if ($gdimg = imagecreatetruecolor($newW, $newH)) {
imagecopy($gdimg, $imgCropped, 0, 0, 0, 0, $newW, $newH);
imagedestroy($imgCropped);
return true;
}
imagedestroy($imgCropped);
}
return false;
}
public function Desaturate(&$gdimg, $amount, $color='') {
if ($amount == 0) {
return true;
}
return $this->Colorize($gdimg, $amount, (phpthumb_functions::IsHexColor($color) ? $color : 'gray'));
}
public function DropShadow(&$gdimg, $distance, $width, $hexcolor, $angle, $alpha) {
if (phpthumb_functions::gd_version() < 2) {
return false;
}
$distance = ($distance ? $distance : 10);
$width = ($width ? $width : 10);
$hexcolor = ($hexcolor ? $hexcolor : '000000');
$angle = ($angle ? $angle : 225) % 360;
$alpha = max(0, min(100, ($alpha ? $alpha : 100)));
if ($alpha <= 0) {
// invisible shadow, nothing to do
return true;
}
if ($distance <= 0) {
// shadow completely obscured by source image, nothing to do
return true;
}
//$width_shadow = cos(deg2rad($angle)) * ($distance + $width);
//$height_shadow = sin(deg2rad($angle)) * ($distance + $width);
//$scaling = min(imagesx($gdimg) / (imagesx($gdimg) + abs($width_shadow)), imagesy($gdimg) / (imagesy($gdimg) + abs($height_shadow)));
$Offset = array();
for ($i = 0; $i < $width; $i++) {
$WidthAlpha[$i] = (abs(($width / 2) - $i) / $width);
$Offset['x'] = cos(deg2rad($angle)) * ($distance + $i);
$Offset['y'] = sin(deg2rad($angle)) * ($distance + $i);
}
$tempImageWidth = imagesx($gdimg) + abs($Offset['x']);
$tempImageHeight = imagesy($gdimg) + abs($Offset['y']);
if ($gdimg_dropshadow_temp = phpthumb_functions::ImageCreateFunction($tempImageWidth, $tempImageHeight)) {
imagealphablending($gdimg_dropshadow_temp, false);
imagesavealpha($gdimg_dropshadow_temp, true);
$transparent1 = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_dropshadow_temp, 0, 0, 0, 127);
imagefill($gdimg_dropshadow_temp, 0, 0, $transparent1);
$PixelMap = array();
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
$PixelMap[$x][$y] = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
}
}
for ($x = 0; $x < $tempImageWidth; $x++) {
for ($y = 0; $y < $tempImageHeight; $y++) {
//for ($i = 0; $i < $width; $i++) {
for ($i = 0; $i < 1; $i++) {
if (!isset($PixelMap[$x][$y]['alpha']) || ($PixelMap[$x][$y]['alpha'] > 0)) {
if (isset($PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha']) && ($PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha'] < 127)) {
$thisColor = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor, false, $PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha']);
imagesetpixel($gdimg_dropshadow_temp, $x, $y, $thisColor);
}
}
}
}
}
imagealphablending($gdimg_dropshadow_temp, true);
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
if ($PixelMap[$x][$y]['alpha'] < 127) {
$thisColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_dropshadow_temp, $PixelMap[$x][$y]['red'], $PixelMap[$x][$y]['green'], $PixelMap[$x][$y]['blue'], $PixelMap[$x][$y]['alpha']);
imagesetpixel($gdimg_dropshadow_temp, $x, $y, $thisColor);
}
}
}
imagesavealpha($gdimg, true);
imagealphablending($gdimg, false);
//$this->is_alpha = true;
$transparent2 = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 0, 0, 0, 127);
imagefilledrectangle($gdimg, 0, 0, imagesx($gdimg), imagesy($gdimg), $transparent2);
imagecopyresampled($gdimg, $gdimg_dropshadow_temp, 0, 0, 0, 0, imagesx($gdimg), imagesy($gdimg), imagesx($gdimg_dropshadow_temp), imagesy($gdimg_dropshadow_temp));
imagedestroy($gdimg_dropshadow_temp);
}
return true;
}
public function EdgeDetect(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_EDGEDETECT)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_EDGEDETECT)', __FILE__, __LINE__);
// fall through and try it the hard way
}
// currently not implemented "the hard way"
$this->DebugMessage('FAILED: phpthumb_filters::EdgeDetect($gdimg) [function not implemented]', __FILE__, __LINE__);
return false;
}
public function Ellipse($gdimg) {
if (phpthumb_functions::gd_version() < 2) {
return false;
}
// generate mask at twice desired resolution and downsample afterwards for easy antialiasing
if ($gdimg_ellipsemask_double = phpthumb_functions::ImageCreateFunction(imagesx($gdimg) * 2, imagesy($gdimg) * 2)) {
if ($gdimg_ellipsemask = phpthumb_functions::ImageCreateFunction(imagesx($gdimg), imagesy($gdimg))) {
$color_transparent = imagecolorallocate($gdimg_ellipsemask_double, 255, 255, 255);
imagefilledellipse($gdimg_ellipsemask_double, imagesx($gdimg), imagesy($gdimg), (imagesx($gdimg) - 1) * 2, (imagesy($gdimg) - 1) * 2, $color_transparent);
imagecopyresampled($gdimg_ellipsemask, $gdimg_ellipsemask_double, 0, 0, 0, 0, imagesx($gdimg), imagesy($gdimg), imagesx($gdimg) * 2, imagesy($gdimg) * 2);
$this->ApplyMask($gdimg_ellipsemask, $gdimg);
imagedestroy($gdimg_ellipsemask);
return true;
} else {
$this->DebugMessage('$gdimg_ellipsemask = phpthumb_functions::ImageCreateFunction() failed', __FILE__, __LINE__);
}
imagedestroy($gdimg_ellipsemask_double);
} else {
$this->DebugMessage('$gdimg_ellipsemask_double = phpthumb_functions::ImageCreateFunction() failed', __FILE__, __LINE__);
}
return false;
}
public function Emboss(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_EMBOSS)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_EMBOSS)', __FILE__, __LINE__);
// fall through and try it the hard way
}
// currently not implemented "the hard way"
$this->DebugMessage('FAILED: phpthumb_filters::Emboss($gdimg) [function not implemented]', __FILE__, __LINE__);
return false;
}
public function Flip(&$gdimg, $x=false, $y=false) {
if (!$x && !$y) {
return false;
}
if ($tempImage = phpthumb_functions::ImageCreateFunction(imagesx($gdimg), imagesy($gdimg))) {
if ($x) {
imagecopy($tempImage, $gdimg, 0, 0, 0, 0, imagesx($gdimg), imagesy($gdimg));
for ($x = 0, $xMax = imagesx($gdimg); $x < $xMax; $x++) {
imagecopy($gdimg, $tempImage, imagesx($gdimg) - 1 - $x, 0, $x, 0, 1, imagesy($gdimg));
}
}
if ($y) {
imagecopy($tempImage, $gdimg, 0, 0, 0, 0, imagesx($gdimg), imagesy($gdimg));
for ($y = 0, $yMax = imagesy($gdimg); $y < $yMax; $y++) {
imagecopy($gdimg, $tempImage, 0, imagesy($gdimg) - 1 - $y, 0, $y, imagesx($gdimg), 1);
}
}
imagedestroy($tempImage);
}
return true;
}
public function Frame(&$gdimg, $frame_width, $edge_width, $hexcolor_frame, $hexcolor1, $hexcolor2) {
$frame_width = ($frame_width ? $frame_width : 5);
$edge_width = ($edge_width ? $edge_width : 1);
$hexcolor_frame = ($hexcolor_frame ? $hexcolor_frame : 'CCCCCC');
$hexcolor1 = ($hexcolor1 ? $hexcolor1 : 'FFFFFF');
$hexcolor2 = ($hexcolor2 ? $hexcolor2 : '000000');
$color_frame = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor_frame);
$color1 = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor1);
$color2 = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor2);
for ($i = 0; $i < $edge_width; $i++) {
// outer bevel
imageline($gdimg, $i, $i, $i, imagesy($gdimg) - $i, $color1); // left
imageline($gdimg, $i, $i, imagesx($gdimg) - $i, $i, $color1); // top
imageline($gdimg, imagesx($gdimg) - $i, imagesy($gdimg) - $i, imagesx($gdimg) - $i, $i, $color2); // right
imageline($gdimg, imagesx($gdimg) - $i, imagesy($gdimg) - $i, $i, imagesy($gdimg) - $i, $color2); // bottom
}
for ($i = 0; $i < $frame_width; $i++) {
// actual frame
imagerectangle($gdimg, $edge_width + $i, $edge_width + $i, imagesx($gdimg) - $edge_width - $i, imagesy($gdimg) - $edge_width - $i, $color_frame);
}
for ($i = 0; $i < $edge_width; $i++) {
// inner bevel
imageline($gdimg, $frame_width + $edge_width + $i, $frame_width + $edge_width + $i, $frame_width + $edge_width + $i, imagesy($gdimg) - $frame_width - $edge_width - $i, $color2); // left
imageline($gdimg, $frame_width + $edge_width + $i, $frame_width + $edge_width + $i, imagesx($gdimg) - $frame_width - $edge_width - $i, $frame_width + $edge_width + $i, $color2); // top
imageline($gdimg, imagesx($gdimg) - $frame_width - $edge_width - $i, imagesy($gdimg) - $frame_width - $edge_width - $i, imagesx($gdimg) - $frame_width - $edge_width - $i, $frame_width + $edge_width + $i, $color1); // right
imageline($gdimg, imagesx($gdimg) - $frame_width - $edge_width - $i, imagesy($gdimg) - $frame_width - $edge_width - $i, $frame_width + $edge_width + $i, imagesy($gdimg) - $frame_width - $edge_width - $i, $color1); // bottom
}
return true;
}
public function Gamma(&$gdimg, $amount) {
if (number_format($amount, 4) == '1.0000') {
return true;
}
return imagegammacorrect($gdimg, 1.0, $amount);
}
public function Grayscale(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_GRAYSCALE)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_GRAYSCALE)', __FILE__, __LINE__);
// fall through and try it the hard way
}
return $this->Colorize($gdimg, 100, 'gray');
}
public function HistogramAnalysis(&$gdimg, $calculateGray=false) {
$ImageSX = imagesx($gdimg);
$ImageSY = imagesy($gdimg);
$Analysis = array();
for ($x = 0; $x < $ImageSX; $x++) {
for ($y = 0; $y < $ImageSY; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
@$Analysis['red'][$OriginalPixel['red']]++;
@$Analysis['green'][$OriginalPixel['green']]++;
@$Analysis['blue'][$OriginalPixel['blue']]++;
@$Analysis['alpha'][$OriginalPixel['alpha']]++;
if ($calculateGray) {
$GrayPixel = phpthumb_functions::GrayscalePixel($OriginalPixel);
@$Analysis['gray'][$GrayPixel['red']]++;
}
}
}
$keys = array('red', 'green', 'blue', 'alpha');
if ($calculateGray) {
$keys[] = 'gray';
}
foreach ($keys as $dummy => $key) {
ksort($Analysis[$key]);
}
return $Analysis;
}
public function HistogramStretch(&$gdimg, $band='*', $method=0, $threshold=0.1) {
// equivalent of "Auto Contrast" in Adobe Photoshop
// method 0 stretches according to RGB colors. Gives a more conservative stretch.
// method 1 band stretches according to grayscale which is color-biased (59% green, 30% red, 11% blue). May give a punchier / more aggressive stretch, possibly appearing over-saturated
$Analysis = $this->HistogramAnalysis($gdimg, true);
$keys = array('r'=>'red', 'g'=>'green', 'b'=>'blue', 'a'=>'alpha', '*'=> ($method == 0) ? 'all' : 'gray' );
$band = $band[ 0 ];
if (!isset($keys[$band])) {
return false;
}
$key = $keys[$band];
// If the absolute brightest and darkest pixels are used then one random
// pixel in the image could throw off the whole system. Instead, count up/down
// from the limit and allow <threshold> (default = 0.1%) of brightest/darkest
// pixels to be clipped to min/max
$threshold = (float) $threshold / 100;
$clip_threshold = imagesx($gdimg) * imagesx($gdimg) * $threshold;
$countsum = 0;
$range_min = 0;
for ($i = 0; $i <= 255; $i++) {
if ($method == 0) {
$countsum = max(@$Analysis['red'][$i], @$Analysis['green'][$i], @$Analysis['blue'][$i]);
} else {
$countsum += @$Analysis[$key][$i];
}
if ($countsum >= $clip_threshold) {
$range_min = $i - 1;
break;
}
}
$range_min = max($range_min, 0);
$countsum = 0;
$range_max = 255;
for ($i = 255; $i >= 0; $i--) {
if ($method == 0) {
$countsum = max(@$Analysis['red'][$i], @$Analysis['green'][$i], @$Analysis['blue'][$i]);
} else {
$countsum += @$Analysis[$key][$i];
}
if ($countsum >= $clip_threshold) {
$range_max = $i + 1;
break;
}
}
$range_max = min($range_max, 255);
$range_scale = (($range_max == $range_min) ? 1 : (255 / ($range_max - $range_min)));
if (($range_min == 0) && ($range_max == 255)) {
// no adjustment necessary - don't waste CPU time!
return true;
}
$ImageSX = imagesx($gdimg);
$ImageSY = imagesy($gdimg);
for ($x = 0; $x < $ImageSX; $x++) {
for ($y = 0; $y < $ImageSY; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
if ($band == '*') {
$new['red'] = min(255, max(0, ($OriginalPixel['red'] - $range_min) * $range_scale));
$new['green'] = min(255, max(0, ($OriginalPixel['green'] - $range_min) * $range_scale));
$new['blue'] = min(255, max(0, ($OriginalPixel['blue'] - $range_min) * $range_scale));
$new['alpha'] = min(255, max(0, ($OriginalPixel['alpha'] - $range_min) * $range_scale));
} else {
$new = $OriginalPixel;
$new[$key] = min(255, max(0, ($OriginalPixel[$key] - $range_min) * $range_scale));
}
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, $new['red'], $new['green'], $new['blue'], $new['alpha']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function HistogramOverlay(&$gdimg, $bands='*', $colors='', $width=0.25, $height=0.25, $alignment='BR', $opacity=50, $margin_x=5, $margin_y=null) {
$margin_y = (null === $margin_y ? $margin_x : $margin_y);
$Analysis = $this->HistogramAnalysis($gdimg, true);
$histW = round(($width > 1) ? min($width, imagesx($gdimg)) : imagesx($gdimg) * $width);
$histH = round(($width > 1) ? min($width, imagesx($gdimg)) : imagesx($gdimg) * $width);
if ($gdHist = imagecreatetruecolor($histW, $histH)) {
$color_back = phpthumb_functions::ImageColorAllocateAlphaSafe($gdHist, 0, 0, 0, 127);
imagefilledrectangle($gdHist, 0, 0, $histW, $histH, $color_back);
imagealphablending($gdHist, false);
imagesavealpha($gdHist, true);
$HistogramTempWidth = 256;
$HistogramTempHeight = 100;
if ($gdHistTemp = imagecreatetruecolor($HistogramTempWidth, $HistogramTempHeight)) {
$color_back_temp = phpthumb_functions::ImageColorAllocateAlphaSafe($gdHistTemp, 255, 0, 255, 127);
imagealphablending($gdHistTemp, false);
imagesavealpha($gdHistTemp, true);
imagefilledrectangle($gdHistTemp, 0, 0, imagesx($gdHistTemp), imagesy($gdHistTemp), $color_back_temp);
$DefaultColors = array('r'=>'FF0000', 'g'=>'00FF00', 'b'=>'0000FF', 'a'=>'999999', '*'=>'FFFFFF');
$Colors = explode(';', $colors);
$BandsToGraph = array_unique(preg_split('##', $bands));
$keys = array('r'=>'red', 'g'=>'green', 'b'=>'blue', 'a'=>'alpha', '*'=>'gray');
foreach ($BandsToGraph as $key => $band) {
if (!isset($keys[$band])) {
continue;
}
$PeakValue = max($Analysis[$keys[$band]]);
$thisColor = phpthumb_functions::ImageHexColorAllocate($gdHistTemp, phpthumb_functions::IsHexColor(@$Colors[$key]) ? $Colors[$key] : $DefaultColors[$band]);
for ($x = 0; $x < $HistogramTempWidth; $x++) {
imageline($gdHistTemp, $x, $HistogramTempHeight - 1, $x, $HistogramTempHeight - 1 - round(@$Analysis[$keys[$band]][$x] / $PeakValue * $HistogramTempHeight), $thisColor);
}
imageline($gdHistTemp, 0, $HistogramTempHeight - 1, $HistogramTempWidth - 1, $HistogramTempHeight - 1, $thisColor);
imageline($gdHistTemp, 0, $HistogramTempHeight - 2, $HistogramTempWidth - 1, $HistogramTempHeight - 2, $thisColor);
}
imagecopyresampled($gdHist, $gdHistTemp, 0, 0, 0, 0, imagesx($gdHist), imagesy($gdHist), imagesx($gdHistTemp), imagesy($gdHistTemp));
imagedestroy($gdHistTemp);
} else {
return false;
}
$this->WatermarkOverlay($gdimg, $gdHist, $alignment, $opacity, $margin_x, $margin_y);
imagedestroy($gdHist);
return true;
}
return false;
}
public function ImageBorder(&$gdimg, $border_width, $radius_x, $radius_y, $hexcolor_border) {
$border_width = ($border_width ? $border_width : 1);
$radius_x = ($radius_x ? $radius_x : 0);
$radius_y = ($radius_y ? $radius_y : 0);
$output_width = imagesx($gdimg);
$output_height = imagesy($gdimg);
list($new_width, $new_height) = phpthumb_functions::ProportionalResize($output_width, $output_height, $output_width - max($border_width * 2, $radius_x), $output_height - max($border_width * 2, $radius_y));
$offset_x = ($radius_x ? $output_width - $new_width - $radius_x : 0);
if ($gd_border_canvas = phpthumb_functions::ImageCreateFunction($output_width, $output_height)) {
imagesavealpha($gd_border_canvas, true);
imagealphablending($gd_border_canvas, false);
$color_background = phpthumb_functions::ImageColorAllocateAlphaSafe($gd_border_canvas, 255, 255, 255, 127);
imagefilledrectangle($gd_border_canvas, 0, 0, $output_width, $output_height, $color_background);
$color_border = phpthumb_functions::ImageHexColorAllocate($gd_border_canvas, (phpthumb_functions::IsHexColor($hexcolor_border) ? $hexcolor_border : '000000'));
for ($i = 0; $i < $border_width; $i++) {
imageline($gd_border_canvas, floor($offset_x / 2) + $radius_x, $i, $output_width - $radius_x - ceil($offset_x / 2), $i, $color_border); // top
imageline($gd_border_canvas, floor($offset_x / 2) + $radius_x, $output_height - 1 - $i, $output_width - $radius_x - ceil($offset_x / 2), $output_height - 1 - $i, $color_border); // bottom
imageline($gd_border_canvas, floor($offset_x / 2) + $i, $radius_y, floor($offset_x / 2) + $i, $output_height - $radius_y, $color_border); // left
imageline($gd_border_canvas, $output_width - 1 - $i - ceil($offset_x / 2), $radius_y, $output_width - 1 - $i - ceil($offset_x / 2), $output_height - $radius_y, $color_border); // right
}
if ($radius_x && $radius_y) {
// PHP bug: imagearc() with thicknesses > 1 give bad/undesirable/unpredicatable results
// Solution: Draw multiple 1px arcs side-by-side.
// Problem: parallel arcs give strange/ugly antialiasing problems
// Solution: draw non-parallel arcs, from one side of the line thickness at the start angle
// to the opposite edge of the line thickness at the terminating angle
for ($thickness_offset = 0; $thickness_offset < $border_width; $thickness_offset++) {
imagearc($gd_border_canvas, floor($offset_x / 2) + 1 + $radius_x, $thickness_offset - 1 + $radius_y, $radius_x * 2, $radius_y * 2, 180, 270, $color_border); // top-left
imagearc($gd_border_canvas, $output_width - $radius_x - 1 - ceil($offset_x / 2), $thickness_offset - 1 + $radius_y, $radius_x * 2, $radius_y * 2, 270, 360, $color_border); // top-right
imagearc($gd_border_canvas, $output_width - $radius_x - 1 - ceil($offset_x / 2), $output_height - $thickness_offset - $radius_y, $radius_x * 2, $radius_y * 2, 0, 90, $color_border); // bottom-right
imagearc($gd_border_canvas, floor($offset_x / 2) + 1 + $radius_x, $output_height - $thickness_offset - $radius_y, $radius_x * 2, $radius_y * 2, 90, 180, $color_border); // bottom-left
}
if ($border_width > 1) {
for ($thickness_offset = 0; $thickness_offset < $border_width; $thickness_offset++) {
imagearc($gd_border_canvas, floor($offset_x / 2) + $thickness_offset + $radius_x, $radius_y, $radius_x * 2, $radius_y * 2, 180, 270, $color_border); // top-left
imagearc($gd_border_canvas, $output_width - $thickness_offset - $radius_x - 1 - ceil($offset_x / 2), $radius_y, $radius_x * 2, $radius_y * 2, 270, 360, $color_border); // top-right
imagearc($gd_border_canvas, $output_width - $thickness_offset - $radius_x - 1 - ceil($offset_x / 2), $output_height - $radius_y, $radius_x * 2, $radius_y * 2, 0, 90, $color_border); // bottom-right
imagearc($gd_border_canvas, floor($offset_x / 2) + $thickness_offset + $radius_x, $output_height - $radius_y, $radius_x * 2, $radius_y * 2, 90, 180, $color_border); // bottom-left
}
}
}
$this->phpThumbObject->ImageResizeFunction($gd_border_canvas, $gdimg, floor(($output_width - $new_width) / 2), round(($output_height - $new_height) / 2), 0, 0, $new_width, $new_height, $output_width, $output_height);
imagedestroy($gdimg);
$gdimg = phpthumb_functions::ImageCreateFunction($output_width, $output_height);
imagesavealpha($gdimg, true);
imagealphablending($gdimg, false);
$gdimg_color_background = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 255, 255, 255, 127);
imagefilledrectangle($gdimg, 0, 0, $output_width, $output_height, $gdimg_color_background);
imagecopy($gdimg, $gd_border_canvas, 0, 0, 0, 0, $output_width, $output_height);
imagedestroy($gd_border_canvas);
return true;
} else {
$this->DebugMessage('FAILED: $gd_border_canvas = phpthumb_functions::ImageCreateFunction('.$output_width.', '.$output_height.')', __FILE__, __LINE__);
}
return false;
}
public static function ImprovedImageRotate(&$gdimg_source, $rotate_angle=0, $config_background_hexcolor='FFFFFF', $bg=null, &$phpThumbObject) {
while ($rotate_angle < 0) {
$rotate_angle += 360;
}
$rotate_angle %= 360;
if ($rotate_angle != 0) {
$background_color = phpthumb_functions::ImageHexColorAllocate($gdimg_source, $config_background_hexcolor);
if ((phpthumb_functions::gd_version() >= 2) && !$bg && ($rotate_angle % 90)) {
//$this->DebugMessage('Using alpha rotate', __FILE__, __LINE__);
if ($gdimg_rotate_mask = phpthumb_functions::ImageCreateFunction(imagesx($gdimg_source), imagesy($gdimg_source))) {
$color_mask = array();
for ($i = 0; $i <= 255; $i++) {
$color_mask[$i] = imagecolorallocate($gdimg_rotate_mask, $i, $i, $i);
}
imagefilledrectangle($gdimg_rotate_mask, 0, 0, imagesx($gdimg_rotate_mask), imagesy($gdimg_rotate_mask), $color_mask[255]);
$imageX = imagesx($gdimg_source);
$imageY = imagesy($gdimg_source);
for ($x = 0; $x < $imageX; $x++) {
for ($y = 0; $y < $imageY; $y++) {
$pixelcolor = phpthumb_functions::GetPixelColor($gdimg_source, $x, $y);
imagesetpixel($gdimg_rotate_mask, $x, $y, $color_mask[255 - round($pixelcolor['alpha'] * 255 / 127)]);
}
}
$gdimg_rotate_mask = imagerotate($gdimg_rotate_mask, $rotate_angle, $color_mask[0]);
$gdimg_source = imagerotate($gdimg_source, $rotate_angle, $background_color);
imagealphablending($gdimg_source, false);
imagesavealpha($gdimg_source, true);
//$this->is_alpha = true;
$phpThumbFilters = new self();
//$phpThumbFilters->phpThumbObject = $this;
$phpThumbFilters->phpThumbObject = $phpThumbObject;
$phpThumbFilters->ApplyMask($gdimg_rotate_mask, $gdimg_source);
imagedestroy($gdimg_rotate_mask);
} else {
//$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
}
} else {
if (phpthumb_functions::gd_version() < 2) {
//$this->DebugMessage('Using non-alpha rotate because gd_version is "'.phpthumb_functions::gd_version().'"', __FILE__, __LINE__);
} elseif ($bg) {
//$this->DebugMessage('Using non-alpha rotate because $this->bg is "'.$bg.'"', __FILE__, __LINE__);
} elseif ($rotate_angle % 90) {
//$this->DebugMessage('Using non-alpha rotate because ($rotate_angle % 90) = "'.($rotate_angle % 90).'"', __FILE__, __LINE__);
} else {
//$this->DebugMessage('Using non-alpha rotate because $this->thumbnailFormat is "'.$this->thumbnailFormat.'"', __FILE__, __LINE__);
}
if (imagecolortransparent($gdimg_source) >= 0) {
// imagerotate() forgets all about an image's transparency and sets the transparent color to black
// To compensate, flood-fill the transparent color of the source image with the specified background color first
// then rotate and the colors should match
if (!function_exists('imageistruecolor') || !imageistruecolor($gdimg_source)) {
// convert paletted image to true-color before rotating to prevent nasty aliasing artifacts
//$this->source_width = imagesx($gdimg_source);
//$this->source_height = imagesy($gdimg_source);
$gdimg_newsrc = phpthumb_functions::ImageCreateFunction(imagesx($gdimg_source), imagesy($gdimg_source));
$background_color = phpthumb_functions::ImageHexColorAllocate($gdimg_newsrc, $config_background_hexcolor);
imagefilledrectangle($gdimg_newsrc, 0, 0, imagesx($gdimg_source), imagesy($gdimg_source), phpthumb_functions::ImageHexColorAllocate($gdimg_newsrc, $config_background_hexcolor));
imagecopy($gdimg_newsrc, $gdimg_source, 0, 0, 0, 0, imagesx($gdimg_source), imagesy($gdimg_source));
imagedestroy($gdimg_source);
unset($gdimg_source);
$gdimg_source = $gdimg_newsrc;
unset($gdimg_newsrc);
} else {
imagecolorset(
$gdimg_source,
imagecolortransparent($gdimg_source),
hexdec(substr($config_background_hexcolor, 0, 2)),
hexdec(substr($config_background_hexcolor, 2, 2)),
hexdec(substr($config_background_hexcolor, 4, 2)));
imagecolortransparent($gdimg_source, -1);
}
}
$gdimg_source = imagerotate($gdimg_source, $rotate_angle, $background_color);
}
}
return true;
}
public function MeanRemoval(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_MEAN_REMOVAL)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_MEAN_REMOVAL)', __FILE__, __LINE__);
// fall through and try it the hard way
}
// currently not implemented "the hard way"
$this->DebugMessage('FAILED: phpthumb_filters::MeanRemoval($gdimg) [function not implemented]', __FILE__, __LINE__);
return false;
}
public function Negative(&$gdimg) {
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_NEGATE)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_NEGATE)', __FILE__, __LINE__);
// fall through and try it the hard way
}
$ImageSX = imagesx($gdimg);
$ImageSY = imagesy($gdimg);
for ($x = 0; $x < $ImageSX; $x++) {
for ($y = 0; $y < $ImageSY; $y++) {
$currentPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, ~$currentPixel[ 'red'] & 0xFF, ~$currentPixel[ 'green'] & 0xFF, ~$currentPixel[ 'blue'] & 0xFF, $currentPixel[ 'alpha']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function RoundedImageCorners(&$gdimg, $radius_x, $radius_y) {
// generate mask at twice desired resolution and downsample afterwards for easy antialiasing
// mask is generated as a white double-size ellipse on a triple-size black background and copy-paste-resampled
// onto a correct-size mask image as 4 corners due to errors when the entire mask is resampled at once (gray edges)
if ($gdimg_cornermask_triple = phpthumb_functions::ImageCreateFunction($radius_x * 6, $radius_y * 6)) {
if ($gdimg_cornermask = phpthumb_functions::ImageCreateFunction(imagesx($gdimg), imagesy($gdimg))) {
$color_transparent = imagecolorallocate($gdimg_cornermask_triple, 255, 255, 255);
imagefilledellipse($gdimg_cornermask_triple, $radius_x * 3, $radius_y * 3, $radius_x * 4, $radius_y * 4, $color_transparent);
imagefilledrectangle($gdimg_cornermask, 0, 0, imagesx($gdimg), imagesy($gdimg), $color_transparent);
imagecopyresampled($gdimg_cornermask, $gdimg_cornermask_triple, 0, 0, $radius_x, $radius_y, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
imagecopyresampled($gdimg_cornermask, $gdimg_cornermask_triple, 0, imagesy($gdimg) - $radius_y, $radius_x, $radius_y * 3, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
imagecopyresampled($gdimg_cornermask, $gdimg_cornermask_triple, imagesx($gdimg) - $radius_x, imagesy($gdimg) - $radius_y, $radius_x * 3, $radius_y * 3, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
imagecopyresampled($gdimg_cornermask, $gdimg_cornermask_triple, imagesx($gdimg) - $radius_x, 0, $radius_x * 3, $radius_y, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
$this->ApplyMask($gdimg_cornermask, $gdimg);
imagedestroy($gdimg_cornermask);
$this->DebugMessage('RoundedImageCorners('.$radius_x.', '.$radius_y.') succeeded', __FILE__, __LINE__);
return true;
} else {
$this->DebugMessage('FAILED: $gdimg_cornermask = phpthumb_functions::ImageCreateFunction('.imagesx($gdimg).', '.imagesy($gdimg).')', __FILE__, __LINE__);
}
imagedestroy($gdimg_cornermask_triple);
} else {
$this->DebugMessage('FAILED: $gdimg_cornermask_triple = phpthumb_functions::ImageCreateFunction('.($radius_x * 6).', '.($radius_y * 6).')', __FILE__, __LINE__);
}
return false;
}
public function Saturation(&$gdimg, $amount, $color='') {
if ($amount == 0) {
return true;
} elseif ($amount > 0) {
$amount = 0 - $amount;
} else {
$amount = abs($amount);
}
return $this->Desaturate($gdimg, $amount, $color);
}
public function Sepia(&$gdimg, $amount, $targetColor) {
$amount = (is_numeric($amount) ? max(0, min(100, $amount)) : 50);
$amountPct = $amount / 100;
$targetColor = (phpthumb_functions::IsHexColor($targetColor) ? $targetColor : 'A28065');
if ($amount == 0) {
return true;
}
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_GRAYSCALE)) {
$r = round($amountPct * hexdec(substr($targetColor, 0, 2)));
$g = round($amountPct * hexdec(substr($targetColor, 2, 2)));
$b = round($amountPct * hexdec(substr($targetColor, 4, 2)));
if (imagefilter($gdimg, IMG_FILTER_COLORIZE, $r, $g, $b)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_COLORIZE)', __FILE__, __LINE__);
// fall through and try it the hard way
} else {
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_GRAYSCALE)', __FILE__, __LINE__);
// fall through and try it the hard way
}
}
$TargetPixel['red'] = hexdec(substr($targetColor, 0, 2));
$TargetPixel['green'] = hexdec(substr($targetColor, 2, 2));
$TargetPixel['blue'] = hexdec(substr($targetColor, 4, 2));
$ImageSX = imagesx($gdimg);
$ImageSY = imagesy($gdimg);
for ($x = 0; $x < $ImageSX; $x++) {
for ($y = 0; $y < $ImageSY; $y++) {
$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$GrayPixel = phpthumb_functions::GrayscalePixel($OriginalPixel);
// http://www.gimpguru.org/Tutorials/SepiaToning/
// "In the traditional sepia toning process, the tinting occurs most in
// the mid-tones: the lighter and darker areas appear to be closer to B&W."
$SepiaAmount = ((128 - abs($GrayPixel['red'] - 128)) / 128) * $amountPct;
$NewPixel = array();
foreach ($TargetPixel as $key => $value) {
$NewPixel[$key] = round(max(0, min(255, $GrayPixel[$key] * (1 - $SepiaAmount) + ($TargetPixel[$key] * $SepiaAmount))));
}
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue'], $OriginalPixel['alpha']);
imagesetpixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
public function Smooth(&$gdimg, $amount=6) {
$amount = min(25, max(0, $amount));
if ($amount == 0) {
return true;
}
if (phpthumb_functions::version_compare_replacement(PHP_VERSION, '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
if (imagefilter($gdimg, IMG_FILTER_SMOOTH, $amount)) {
return true;
}
$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_SMOOTH, '.$amount.')', __FILE__, __LINE__);
// fall through and try it the hard way