Fix AlphaMasking on GPU Cached Sprites

[lazyremixmanordummyplayinggmod]

As the title says currently there is a issue with AlphaMasking using FlxSpriteUtil

[ItsLJcool]

Referencing back to your previous issue on cne-flixel Issue #23, this is an already known bug and @Raltyro probably knows a way to fix but currently there is no fix on this issue.

From previous knowledge and some issues that would need to be solved in either OpenFL or Flixel, currently not possible to fix this issue.

Also it's not just FlxSpriteUtil, the reason (again) it can't "AlphaMask" is the fact that GPU Cached Bitmaps return null when retrieving bitmap.pixels, so it throws a Null Object Reference.

You can fix the issue by making that specific Bitmap a CPU cached sprite, using Assets.getBitmapData, look at it's parameters (in cne-flixel) and once you call it, it returns the BitmapData as a CPU Cached graphic, and all future cache returns will return the CPU Cached sprite, until the cached is cleared.