/**
* Renders the actual binary image using GD library calls.
*
* @since 1.0
*/
public function renderImage()
{
$config = ConfigProvider::getInstance();
// if scaled, we need to compute the target image size
if ($this->scale->getBooleanValue() && isset($_COOKIE['screenSize'])) {
$originalScreenResolution = explode('x', $config->get('sysCMSImagesWidgetScreenResolution'));
$originalScreenX = $originalScreenResolution[0];
$originalScreenY = $originalScreenResolution[1];
$targetScreenResolution = explode('x', $_COOKIE['screenSize']);
$targetScreenX = $targetScreenResolution[0];
$targetScreenY = $targetScreenResolution[1];
// calculate the new units we will scale by
$xu = $targetScreenX / $originalScreenX;
$yu = $targetScreenY / $originalScreenY;
$this->width = new Integer(intval($this->width->getValue() * $xu));
$this->height = new Integer(intval($this->height->getValue() * $yu));
// need to update the cache filename as the dimensions have changed
$this->setFilename();
}
// check the image cache first before we proceed
if ($this->checkCache()) {
$this->loadCache();
} else {
// now get the old image
switch ($this->sourceType->getValue()) {
case 'gif':
$old_image = imagecreatefromgif($this->source);
break;
case 'jpg':
$old_image = imagecreatefromjpeg($this->source);
break;
case 'png':
$old_image = imagecreatefrompng($this->source);
break;
}
if (!$old_image) {
$im = imagecreatetruecolor($this->width->getValue(), $this->height->getValue());
$bgc = imagecolorallocate($im, 255, 255, 255);
$tc = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, $this->width->getValue(), $this->height->getValue(), $bgc);
imagestring($im, 1, 5, 5, "Error loading {$this->source}", $tc);
if ($this->sourceType->getValue() == 'png' && $config->get('cms.images.perserve.png')) {
imagepng($im);
} else {
imagejpeg($im);
}
imagedestroy($im);
} else {
// the dimensions of the source image
$oldWidth = imagesx($old_image);
$oldHeight = imagesy($old_image);
// now create the new image
$new_image = imagecreatetruecolor($this->width->getValue(), $this->height->getValue());
// set a transparent background for PNGs
if ($this->sourceType->getValue() == 'png' && $config->get('cms.images.perserve.png')) {
// Turn off transparency blending (temporarily)
imagealphablending($new_image, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($new_image, 255, 0, 0, 0);
// Completely fill the background of the new image with allocated color.
imagefill($new_image, 0, 0, $color);
// Restore transparency blending
imagesavealpha($new_image, true);
}
// copy the old image to the new image (in memory, not the file!)
imagecopyresampled($new_image, $old_image, 0, 0, 0, 0, $this->width->getValue(), $this->height->getValue(), $oldWidth, $oldHeight);
if ($this->sourceType->getValue() == 'png' && $config->get('cms.images.perserve.png')) {
imagepng($new_image);
} else {
imagejpeg($new_image, null, 100 * $this->quality->getValue());
}
$this->cache($new_image);
imagedestroy($old_image);
imagedestroy($new_image);
}
}
}
