BitmapData.getFirstPixel will scan the BitmapData and return the color and location of the first non-transparent pixel encountered. You can specify one of 4 scan directions: top to bottom, bottom to top, left to right and right to left.

BitmapData.getBounds will return a `Rectangle` object that encompasses the full extent of the non-transparent pixels in the BitmapData. This can be useful if you wish to trim away transparent pixels from the sides of a BitmapData down to size before saving.
Fixed the Filter mouse uniform value population.
Pixi v2 UV update fixes.