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e02ff26569
While this is not optimal, we should cache the png:
1) cache the whole buffer, with comes with RGBARGBA pixel formats
2) Allow switch_image_t to be other formats e.g. VPX_IMG_FMT_ARGB, VPX_IMG_FMT_ARGB_LE, or VPX_IMG_FMT_444A
those can have alpha channels so we can check the alpha channel before we patch
Note all PNG are created equel, or maybe a bug in libpng since for some PNG files with alpha the returned buffer
not seems like RGBARGBA... while docs says it should default be RGBA