As it was just one more manipulation among several other's the ImageSizer was already taking care of, I thought it would be nice to be able to extend the native ImageSizer class by individual methods. But as I - of course - didn't want to change core files and the ImageSizer itself isn't a “module” that seemed hard to achieve. But after I did some research, I found a solution using an instance of ImageSizer encapsuled within a module using magic methods to direct native method calls to the ImageSizer while providing extended methods from the module itself.
It's far from perfect. The code is still messy and I just added methods to check for orientation data, fix orientation and therefor of course image rotation and flipping. Haven't been testing everything yet, but I uploaded the module to github. Could be useful as a starting point.
It is used the same way as the original ImageSizer:
$sizer = new ImageSizerExtended($path); $sizer->method();