WebPPictureHasTransparency  354 3rdparty/libwebp/enc/alpha.c   enc->has_alpha_ = WebPPictureHasTransparency(enc->pic_);
WebPPictureHasTransparency 1127 3rdparty/libwebp/enc/vp8l.c   has_alpha = WebPPictureHasTransparency(picture);
WebPPictureHasTransparency  462 3rdparty/libwebp/webp/encode.h WEBP_EXTERN(int) WebPPictureHasTransparency(const WebPPicture* picture);