diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/display/nr-arena-item.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/display/nr-arena-item.cpp b/src/display/nr-arena-item.cpp index e6b98e78e..c4c42b8b5 100644 --- a/src/display/nr-arena-item.cpp +++ b/src/display/nr-arena-item.cpp @@ -317,8 +317,8 @@ struct MaskLuminanceToAlpha { // the operation of unpremul -> luminance-to-alpha -> multiply by alpha // is equivalent to luminance-to-alpha on premultiplied color values // original computation in double: r*0.2125 + g*0.7154 + b*0.0721 - guint32 ao = r*54 + g*182 + b*18; - return ((ao + 127) / 255) << 24; + guint32 ao = r*109 + g*366 + b*37; // coeffs add up to 512 + return ((ao + 256) << 15) & 0xff000000; // equivalent to ((ao + 256) / 512) << 24 } }; |