/**
* Mixes a transparent background with a resized foreground preview
*
* @param \OC_Image $previewData
* @param int $previewWidth
* @param int $previewHeight
* @param int $newWidth
* @param int $newHeight
* @param int $maxWidth
* @param int $maxHeight
* @param int $newX
* @param int $newY
*
* @return resource
*/
private function processPreview($previewData, $previewWidth, $previewHeight, $newWidth, $newHeight, $maxWidth, $maxHeight, $newX, $newY)
{
$fixedPreview = imagecreatetruecolor($maxWidth, $maxHeight);
// Creates the canvas
// We make the background transparent
imagealphablending($fixedPreview, false);
$transparency = imagecolorallocatealpha($fixedPreview, 0, 0, 0, 127);
imagefill($fixedPreview, 0, 0, $transparency);
imagesavealpha($fixedPreview, true);
imagecopyresampled($fixedPreview, $previewData->resource(), $newX, $newY, 0, 0, $newWidth, $newHeight, $previewWidth, $previewHeight);
return $fixedPreview;
}
