/**
* Determines if there is enough memory to process this image.
*
* The code was adapted from http://www.php.net/manual/en/function.imagecreatefromjpeg.php#64155. It will first
* attempt to do it with available memory. If that fails, Craft will bump the memory to amount defined by the
* [phpMaxMemoryLimit](http://buildwithcraft.com/docs/config-settings#phpMaxMemoryLimit) config setting, then try again.
*
* @param string $filePath The path to the image file.
* @param bool $toTheMax If set to true, will set the PHP memory to the config setting phpMaxMemoryLimit.
*
* @return bool
*/
public function checkMemoryForImage($filePath, $toTheMax = false)
{
if (StringHelper::toLowerCase(IOHelper::getExtension($filePath)) == 'svg') {
return true;
}
if (!function_exists('memory_get_usage')) {
return false;
}
if ($toTheMax) {
// Turn it up to 11.
craft()->config->maxPowerCaptain();
}
// Find out how much memory this image is going to need.
$imageInfo = getimagesize($filePath);
$K64 = 65536;
$tweakFactor = 1.7;
$bits = isset($imageInfo['bits']) ? $imageInfo['bits'] : 8;
$channels = isset($imageInfo['channels']) ? $imageInfo['channels'] : 4;
$memoryNeeded = round(($imageInfo[0] * $imageInfo[1] * $bits * $channels / 8 + $K64) * $tweakFactor);
$memoryLimit = AppHelper::getPhpConfigValueInBytes('memory_limit');
if (memory_get_usage() + $memoryNeeded < $memoryLimit) {
return true;
}
if (!$toTheMax) {
return $this->checkMemoryForImage($filePath, true);
}
// Oh well, we tried.
return false;
}