/**
* {@inheritdoc}
*
* @return ImageInterface
*/
public function applyMask(ImageInterface $mask)
{
if (!$mask instanceof self) {
throw new InvalidArgumentException('Cannot mask non-gd images');
}
$size = $this->getSize();
$maskSize = $mask->getSize();
if ($size != $maskSize) {
throw new InvalidArgumentException(sprintf('The given mask doesn\'t match current image\'s size, Current mask\'s dimensions are %s, while image\'s dimensions are %s', $maskSize, $size));
}
for ($x = 0, $width = $size->getWidth(); $x < $width; $x++) {
for ($y = 0, $height = $size->getHeight(); $y < $height; $y++) {
$position = new Point($x, $y);
$color = $this->getColorAt($position);
$maskColor = $mask->getColorAt($position);
$round = (int) round(max($color->getAlpha(), (100 - $color->getAlpha()) * $maskColor->getRed() / 255));
if (false === imagesetpixel($this->resource, $x, $y, $this->getColor($color->dissolve($round - $color->getAlpha())))) {
throw new RuntimeException('Apply mask operation failed');
}
}
}
return $this;
}
