/**
* Convert HSV (Hue, Saturation, Brightness) to a hex color string.
*
* Originally written by Jurgen Schwietering. Integrated into the class by
* Jason Lotito.
*
* @param integer $h Hue
* @param integer $s Saturation
* @param integer $v Brightness
* @return string The hex string.
* @access public
* @static
* @author Jurgen Schwietering <*****@*****.**>
* @uses rgb2hex() to convert the return value to a hex string.
*/
function hsv2hex($h, $s, $v)
{
$s /= 256.0;
$v /= 256.0;
if ($s == 0.0) {
$r = $g = $b = $v;
return '';
} else {
$h = $h / 256.0 * 6.0;
$i = floor($h);
$f = $h - $i;
$v *= 256.0;
$p = (int) ($v * (1.0 - $s));
$q = (int) ($v * (1.0 - $s * $f));
$t = (int) ($v * (1.0 - $s * (1.0 - $f)));
switch ($i) {
case 0:
$r = $v;
$g = $t;
$b = $p;
break;
case 1:
$r = $q;
$g = $v;
$b = $p;
break;
case 2:
$r = $p;
$g = $v;
$b = $t;
break;
case 3:
$r = $p;
$g = $q;
$b = $v;
break;
case 4:
$r = $t;
$g = $p;
$b = $v;
break;
default:
$r = $v;
$g = $p;
$b = $q;
break;
}
}
return Image_Color::rgb2hex(array($r, $g, $b));
}
function testRgb2hex()
{
$result = Image_Color::rgb2hex(array(171, 205, 239));
$this->assertEquals('ABCDEF', $result);
}
/**
* This is deprecated. Use rgb2hex() instead.
* @access private
* @deprecated Function deprecated after 1.0.1
* @see rgb2hex().
*/
function _returnColor($color)
{
return Image_Color::rgb2hex($color);
}
/**
* Apply tools to image.
*
* This function scan for mask color and closes colors position, grab color
* at found the position on sample image, then set the pixel color at the same
* position on destination image.
*
* @return bool|PEAR_Error TRUE on success or PEAR_Error on failure.
* @access private
* @see Image_Tools_Mask::_getNearestColors()
*/
function render()
{
if (!Image_Tools::isGDImageResource($this->_maskImage)) {
return PEAR::raiseError('Invalid image resource Image_Tools_Mask::$_maskImage');
}
if (!Image_Tools::isGDImageResource($this->_sampleImage)) {
return PEAR::raiseError('Invalid image resource Image_Tools_Mask::$_sampleImage');
}
if (!Image_Tools::isGDImageResource($this->resultImage)) {
return PEAR::raiseError('Invalid image resource Image_Tools_Mask::$_resultImage');
}
$maskWidth = imagesx($this->_maskImage);
$maskHeight = imagesy($this->_maskImage);
$sampleWidth = imagesx($this->_sampleImage);
$sampleHeight = imagesy($this->_sampleImage);
if ($this->options['antialias']) {
$closesColors = $this->_getNearestColors();
} else {
$closesColors = array($this->options['maskColor']);
}
imagealphablending($this->resultImage, true);
// scan for mask color or closes colors position
for ($x = 0; $x < $maskWidth; $x++) {
for ($y = 0; $y < $maskHeight; $y++) {
if ($x >= $sampleWidth || $y >= $sampleHeight) {
continue;
}
// grab color at x, y and convert to hex color format
$index = imagecolorat($this->_maskImage, $x, $y);
$maskRGBA = imagecolorsforindex($this->_maskImage, $index);
$maskColor = Image_Color::rgb2hex(array_values($maskRGBA));
// check color in closes colors collection
if (in_array($maskColor, $closesColors)) {
// grab color at x, y from sample image
$index = imagecolorat($this->_sampleImage, $x, $y);
$sampleRGBA = imagecolorsforindex($this->_sampleImage, $index);
// allocate color on destination image
$color = imagecolorresolvealpha($this->resultImage, $sampleRGBA['red'], $sampleRGBA['green'], $sampleRGBA['blue'], $sampleRGBA['alpha']);
// set a pixel color at destination image
imagesetpixel($this->resultImage, $x, $y, $color);
}
}
}
return true;
}
