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int IMG_isGIF(SDL_RWops *src)
If the GIF format is supported, then the image data is tested to see if it is readable as a GIF, otherwise it returns false (Zero).
Returns: 1 if the image is a GIF and the GIF format support is compiled into SDL_image. 0 is returned otherwise.
3.2.11 IMG_LoadGIF_RW, 3.2.3 IMG_LoadTyped_RW