/**
* Returns a cropped image
*
* @param GDImage_Image $img
* @param smart_coordinate $left
* @param smart_coordinate $top
* @param smart_coordinate $width
* @param smart_coordinate $height
* @return GDImage_Image
*/
function execute($img, $left, $top, $width, $height)
{
$width = GDImage_Coordinate::fix($width, $img->getWidth(), $width);
$height = GDImage_Coordinate::fix($height, $img->getHeight(), $height);
$left = GDImage_Coordinate::fix($left, $img->getWidth(), $width);
$top = GDImage_Coordinate::fix($top, $img->getHeight(), $height);
if ($left < 0) {
$width = $left + $width;
$left = 0;
}
if ($width > $img->getWidth() - $left) {
$width = $img->getWidth() - $left;
}
if ($top < 0) {
$height = $top + $height;
$top = 0;
}
if ($height > $img->getHeight() - $top) {
$height = $img->getHeight() - $top;
}
if ($width <= 0 || $height <= 0) {
JError::raiseError(500, JText::_('JLIB_GDIMAGE_ERROR_CAN_NOT_CROP_OUTSIDE'));
return false;
}
$new = $img->doCreate($width, $height);
if ($img->isTransparent() || $img instanceof GDImage_PaletteImage) {
$new->copyTransparencyFrom($img);
imagecopyresized($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height);
} else {
$new->alphaBlending(false);
$new->saveAlpha(true);
imagecopyresampled($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height);
}
return $new;
}
/**
* Applies a mask on the copy of source image
*
* @param GDImage_Image $image
* @param GDImage_Image $mask
* @param smart_coordinate $left
* @param smart_coordinate $top
* @return GDImage_Image
*/
function execute($image, $mask, $left = 0, $top = 0)
{
$left = WideImage_Coordinate::fix($left, $image->getWidth(), $mask->getWidth());
$top = WideImage_Coordinate::fix($top, $image->getHeight(), $mask->getHeight());
$width = $image->getWidth();
$mask_width = $mask->getWidth();
$height = $image->getHeight();
$mask_height = $mask->getHeight();
$result = $image->asTrueColor();
$result->alphaBlending(false);
$result->saveAlpha(true);
$srcTransparentColor = $result->getTransparentColor();
if ($srcTransparentColor >= 0) {
$destTransparentColor = $srcTransparentColor;
} else {
$destTransparentColor = $result->allocateColorAlpha(255, 255, 255, 127);
}
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
$mx = $x - $left;
$my = $y - $top;
if ($mx >= 0 && $mx < $mask_width && $my >= 0 && $my < $mask_height) {
$srcColor = $image->getColorAt($x, $y);
if ($srcColor == $srcTransparentColor) {
$destColor = $destTransparentColor;
} else {
$maskRGB = $mask->getRGBAt($mx, $my);
if ($maskRGB['red'] == 0) {
$destColor = $destTransparentColor;
} elseif ($srcColor >= 0) {
$imageRGB = $image->getRGBAt($x, $y);
$level = $maskRGB['red'] / 255 * (1 - $imageRGB['alpha'] / 127);
$imageRGB['alpha'] = 127 - round($level * 127);
if ($imageRGB['alpha'] == 127) {
$destColor = $destTransparentColor;
} else {
$destColor = $result->allocateColorAlpha($imageRGB);
}
} else {
$destColor = $destTransparentColor;
}
}
$result->setColorAt($x, $y, $destColor);
}
}
}
return $result;
}
/**
* Returns a merged image
*
* @param GDImage_Image $base
* @param GDImage_Image $overlay
* @param smart_coordinate $left
* @param smart_coordinate $top
* @param numeric $pct
* @return GDImage_Image
*/
function execute($base, $overlay, $left, $top, $pct)
{
$x = GDImage_Coordinate::fix($left, $base->getWidth(), $overlay->getWidth());
$y = GDImage_Coordinate::fix($top, $base->getHeight(), $overlay->getHeight());
$result = $base->asTrueColor();
$result->alphaBlending(true);
$result->saveAlpha(true);
if ($pct <= 0) {
return $result;
}
if ($pct < 100) {
imagecopymerge($result->getHandle(), $overlay->getHandle(), $x, $y, 0, 0, $overlay->getWidth(), $overlay->getHeight(), $pct);
} else {
imagecopy($result->getHandle(), $overlay->getHandle(), $x, $y, 0, 0, $overlay->getWidth(), $overlay->getHeight());
}
return $result;
}
/**
* Fix a coordinate for a resize (limits by image weight and height)
*
* @param GDImage_Image $img
* @param int $width Width of the image
* @param int $height Height of the image
* @return array An array(width, height), fixed for resizing
*/
static function fixForResize($img, $width, $height)
{
if ($width === null && $height === null) {
return array($img->getWidth(), $img->getHeight());
}
if ($width !== null) {
$width = self::fix($width, $img->getWidth());
}
if ($height !== null) {
$height = self::fix($height, $img->getHeight());
}
if ($width === null) {
$width = floor($img->getWidth() * $height / $img->getHeight());
}
if ($height === null) {
$height = floor($img->getHeight() * $width / $img->getWidth());
}
return array($width, $height);
}