SUM1              635 3rdparty/libwebp/enc/picture.c         RGB_TO_UV(x, y, SUM1);
SUM1              647 3rdparty/libwebp/enc/picture.c           RGB_TO_UV0(2 * x, x, y, SUM1);
SUM1              653 3rdparty/libwebp/enc/picture.c           RGB_TO_UV0(x, x, y, SUM1);