wmweather+/wmgeneral/xpm_trans.h

   1 /* Like copyXPMArea, but only copies non-masked pixels */
   2 void combineWithTrans(int sx, int sy, unsigned w, unsigned h, int dx, int dy);
   3
   4 /* Like combineWithTrans, except it combines pixels by this formula:
   5  * new = (src * o + dest * (256 - o)) / 256
   6  */
   7 void combineWithOpacity(int sx, int sy, unsigned w, unsigned h, int dx, int dy, int o);