GetRed            108 libgd/webpimg.c   const int r = GetRed(rgba);
GetRed            490 libgd/webpimg.c       GetRed(rgb_line1 + 0) + GetRed(rgb_line1 + 1) +
GetRed            491 libgd/webpimg.c       GetRed(rgb_line2 + 0) + GetRed(rgb_line2 + 1);
GetRed            514 libgd/webpimg.c     const int sum_r = GetRed(rgb_line1) + GetRed(rgb_line2);