diff options
| -rw-r--r-- | src/core/SkXfermode.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/core/SkXfermode.cpp b/src/core/SkXfermode.cpp index 2cfdcfa4b3..020ea48b37 100644 --- a/src/core/SkXfermode.cpp +++ b/src/core/SkXfermode.cpp @@ -400,9 +400,12 @@ static SkPMColor difference_modeproc(SkPMColor src, SkPMColor dst) { } // kExclusion_Mode -static inline int exclusion_byte(int sc, int dc, int sa, int da) { +static inline int exclusion_byte(int sc, int dc, int, int) { // this equations is wacky, wait for SVG to confirm it - int r = sc * da + dc * sa - 2 * sc * dc + sc * (255 - da) + dc * (255 - sa); + //int r = sc * da + dc * sa - 2 * sc * dc + sc * (255 - da) + dc * (255 - sa); + + // The above equation can be simplified as follows + int r = 255*(sc + dc) - 2 * sc * dc; return clamp_div255round(r); } static SkPMColor exclusion_modeproc(SkPMColor src, SkPMColor dst) { |