MuxValidateForImage  239 3rdparty/libwebp/mux/muxi.h WebPMuxError MuxValidateForImage(const WebPMux* const mux);
MuxValidateForImage  276 3rdparty/libwebp/mux/muxread.c     WebPMuxError err = MuxValidateForImage(mux);  // Check for single image.