If I am guessing correctly. You can create a bitmap the complete size of all the frames in your animation
So if your frame size was say 100 * 200 and you have 5 frames of animation you create an empty bitmap
Of width 100 x 5, 200. Load your resource for each frame and draw object into the empty bitmap offsetting
The x pos by 100 each time. This would create a contiguous strip for you to animate. Next you create a region
The size of a single frame 0,0, 100, 200. Then all you have to do is offset the region in the x pos by 100 to animate
If you set wrap to true it will wrap around. Now if you already have a contiguous bitmap. Then you can skip step one
And just build a region the size of one frame and offset it to move through the frames
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