/**
* Applies the image effect on a GD resource. This function should be overridden by the effect.
* @param resource The image resource to work with
* @return resource The resource to use
*/
protected final function executeFilterGD($imageData)
{
$width = imagesx($imageData);
$height = imagesy($imageData);
//we make sure we cannot go out of bounds
if ($this->reflectionHeight > $height) {
$this->reflectionHeight = $height;
}
//create a new image with alpha channels
$image = imagecreatetruecolor($width, $height + $this->reflectionHeight + $this->gradientDistance - 1);
imagesavealpha($image, true);
//use the proper color for the background and fill
if (!empty($this->reflectionBackgroundColor)) {
$val = new \System\Security\Validate();
if ($val->isHexColor($this->reflectionBackgroundColor, 'color', true) == \System\Security\ValidateResult::VALIDATE_OK) {
$r = 0;
$g = 0;
$b = 0;
\System\Image\ColorConversion::hexToRGB($this->reflectionBackgroundColor, $r, $g, $b);
$transparentColor = imagecolorallocatealpha($image, $r, $g, $b, 0);
}
} else {
$transparentColor = imagecolorallocatealpha($image, 0, 0, 0, 127);
}
imagefill($image, 0, 0, $transparentColor);
//copy the original image into the newimage
imagecopy($image, $imageData, 0, 0, 0, 0, $width, $height);
$transparencyStep = 127 / $this->reflectionHeight;
//copy the bottom $reflectionHeight pixels of the image and make them transparent
for ($y = $height - 1; $y >= $height - $this->reflectionHeight; $y--) {
for ($x = 0; $x < $width; $x++) {
$colors = imagecolorsforindex($imageData, imagecolorat($imageData, $x, $y));
$alpha = intval(round($transparencyStep * ($height - $y)));
if ($colors['alpha'] > $alpha) {
$alpha = $colors['alpha'];
}
$newColor = imagecolorallocatealpha($image, $colors['red'], $colors['green'], $colors['blue'], $alpha);
imagesetpixel($image, $x, $height + ($height - $y) + $this->gradientDistance - 1, $newColor);
}
}
imagedestroy($imageData);
return $image;
}
/**
* Converts a HEX color (3 or 6 digits, in- or excluding #) to RGB colors.
* @param string 3 or 6 digit hex code, optionally preceded by #
* @param integer The red component by reference
* @param integer The green component by reference
* @param integer The blue component by reference
* @return boolean True on succes, false otherwise
*/
public static final function hexToRGB($hex, &$r = 0, &$g = 0, &$b = 0)
{
$val = new \System\Security\Validate();
if ($val->isHexColor($hex, 'color', true) != \System\Security\ValidateResult::VALIDATE_OK) {
return false;
}
$hex = str_replace('#', '', $hex);
if (strlen($hex) == 3) {
$r = hexdec(substr($hex, 0, 1));
$g = hexdec(substr($hex, 1, 1));
$b = hexdec(substr($hex, 2, 1));
$r *= $r;
$g *= $g;
$b *= $b;
} else {
$r = hexdec(substr($hex, 0, 2));
$g = hexdec(substr($hex, 2, 2));
$b = hexdec(substr($hex, 4, 2));
}
return true;
}
