/**
* Checks uploaded file is an image.
*
* @param mixed $value data to filter
* @return mixed filtered value
*/
protected function doTransform($value)
{
if (!$value->exists()) {
throw new T_Exception_Filter('is not a valid file');
}
switch ($value->getMime()->getType()) {
case T_Mime::JPEG:
$this->assertType($value, IMAGETYPE_JPEG, 'JPEG');
break;
case T_Mime::GIF:
$this->assertType($value, IMAGETYPE_GIF, 'GIF');
break;
case T_Mime::PNG:
$this->assertType($value, IMAGETYPE_PNG, 'PNG');
break;
default:
throw new T_Exception_Filter('must be a JPEG, GIF or PNG image');
}
try {
$img = new T_Image_GdFile($value);
} catch (Exception $e) {
throw new T_Exception_Filter('could not be processed (probably too big!)');
}
// normalize extension
$img->convertTo($img->getMime()->getType());
return $img;
}
function testConvertPngToJpg()
{
$im = new T_Image_GdFile(new T_File_Path($this->getImageDir(), 'w-400-h-300', 'png'));
$im->convertTo(T_Mime::JPEG);
$this->assertTrue(strlen($im->__toString()) > 0);
}
