Turns an RGB value into grayscale.
| public static grayscalePixel ( integer[] $originalPixel ) : integer[] | ||
| $originalPixel | integer[] | A hash with 'red', 'green', and 'blue' values. |
| return | integer[] | A hash with 'red', 'green', and 'blue' values for the corresponding gray color. |
/**
* Applies the specified mask to the image.
*
* @param resource $gdimg_mask The gd image resource representing the mask
*
* @return boolean
*/
public function applyMask($gdimg_mask)
{
$imgX = round($this->call('imageSX', array($this->_im)));
$imgY = round($this->call('imageSY', array($this->_im)));
$gdimg_mask_resized = $this->create($imgX, $imgY);
$result = $this->call('imageCopyResampled', array($gdimg_mask_resized, $gdimg_mask, 0, 0, 0, 0, $imgX, $imgY, $this->call('imageSX', array($gdimg_mask)), $this->call('imageSY', array($gdimg_mask))));
$gdimg_mask_blendtemp = $this->create($imgX, $imgY);
$mbtX = $this->call('imageSX', array($gdimg_mask_blendtemp));
$mbtY = $this->call('imageSY', array($gdimg_mask_blendtemp));
$color_background = $this->call('imageColorAllocate', array($gdimg_mask_blendtemp, 0, 0, 0));
$this->call('imageFilledRectangle', array($gdimg_mask_blendtemp, 0, 0, $mbtX, $mbtY, $color_background));
$this->call('imageAlphaBlending', array($gdimg_mask_blendtemp, false));
$this->call('imageSaveAlpha', array($gdimg_mask_blendtemp, true));
for ($x = 0; $x < $imgX; $x++) {
for ($y = 0; $y < $imgY; $y++) {
$colorat = $this->call('imageColorAt', array($this->_im, $x, $y));
$realPixel = $this->call('imageColorsForIndex', array($this->_im, $colorat));
$colorat = $this->call('imageColorAt', array($gdimg_mask_resized, $x, $y));
$maskPixel = Horde_Image::grayscalePixel($this->call('imageColorsForIndex', array($gdimg_mask_resized, $colorat)));
$maskAlpha = 127 - floor($maskPixel['red'] / 2) * (1 - $realPixel['alpha'] / 127);
$newcolor = $this->_allocateColorAlpha($gdimg_mask_blendtemp, $realPixel['red'], $realPixel['green'], $realPixel['blue'], intval($maskAlpha));
$this->call('imageSetPixel', array($gdimg_mask_blendtemp, $x, $y, $newcolor));
}
}
$this->call('imageAlphaBlending', array($this->_im, false));
$this->call('imageSaveAlpha', array($this->_im, true));
$this->call('imageCopy', array($this->_im, $gdimg_mask_blendtemp, 0, 0, 0, 0, $mbtX, $mbtY));
$this->call('imageDestroy', array($gdimg_mask_blendtemp));
$this->call('imageDestroy', array($gdimg_mask_resized));
return true;
}
