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This function is very similar to STATE_bitmap_get_transparent_index()
For info check STATE_bitmap_get_transparent_index()
This function is needed only in the rare cases that some of the
animation bitmaps could not be loaded when the world was loaded.
For example when loading a world from the Internet, at first only the world is loaded
and then we start streaming the bitmaps. We use this function to get the bitmap transparent index
If you want to check if the bitmap is in used then use STATE_animation_get_frame_bitmap_handle()
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