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int IMG_isXV(SDL_RWops *src)
If the XV format is supported, then the image data is tested to see if it is readable as an XV thumbnail, otherwise it returns false (Zero).
Returns: 1 if the image is an XV thumbnail and the XV format support is compiled into SDL_image. 0 is returned otherwise.
3.2.17 IMG_LoadXV_RW, 3.2.3 IMG_LoadTyped_RW