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