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Set the given alpha value to all the pixels in the bitmap
Note !
1. The function can only be called after at least one render was done.
2. Inorder for the function to have any effect, the bitmap format must be one that
includes an alpha component. For example: BITMAP_FORMAT_A8R8G8B8 or BITMAP_FORMAT_A1R5G5B5
or BITMAP_FORMAT_A4R4G4B4. To make sure the loaded bitmaps are in
the desire format call STATE_bitmap_set_default_format() before loading the bitmap
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