in iOS/WAStickersThirdParty/YYImageCoder.h [19:31]
typedef NS_ENUM(NSUInteger, YYImageType) {
YYImageTypeUnknown = 0, ///< unknown
YYImageTypeJPEG, ///< jpeg, jpg
YYImageTypeJPEG2000, ///< jp2
YYImageTypeTIFF, ///< tiff, tif
YYImageTypeBMP, ///< bmp
YYImageTypeICO, ///< ico
YYImageTypeICNS, ///< icns
YYImageTypeGIF, ///< gif
YYImageTypePNG, ///< png
YYImageTypeWebP, ///< webp
YYImageTypeOther, ///< other image format
};