I4DC4             518 3rdparty/libwebp/dsp/enc.c   DC4(I4DC4 + dst, top);
I4DC4             366 3rdparty/libwebp/enc/quant.c   I4DC4, I4TM4, I4VE4, I4HE4, I4RD4, I4VR4, I4LD4, I4VL4, I4HD4, I4HU4