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| author | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-05-05 21:35:09 +0000 |
|---|---|---|
| committer | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-05-05 21:35:09 +0000 |
| commit | abc68a8eeb478a8123d4d283bab5088d0bb949f9 (patch) | |
| tree | 6cf24983bbc94a08b0db9ff2f7353be254e36b1d | |
| parent | a8d28efa76c581b6c6a94f889f38e050a8d21679 (diff) | |
| download | include-abc68a8eeb478a8123d4d283bab5088d0bb949f9.tar.gz | |
fix TriColorShader to respect the paint's alpha
results can be seen in new gm: vertices_80
BUG=skia:
R=scroggo@google.com
Author: reed@google.com
Review URL: https://codereview.chromium.org/270023002
git-svn-id: http://skia.googlecode.com/svn/trunk/include@14581 2bbb7eff-a529-9590-31e7-b0007b416f81
| -rw-r--r-- | core/SkColorPriv.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/core/SkColorPriv.h b/core/SkColorPriv.h index 9591f22..d5571df 100644 --- a/core/SkColorPriv.h +++ b/core/SkColorPriv.h @@ -181,6 +181,15 @@ static inline unsigned SkAlpha255To256(U8CPU alpha) { return alpha + 1; } +/** + * Turn a 0..255 value into a 0..256 value, rounding up if the value is >= 0x80. + * This is slightly more accurate than SkAlpha255To256. + */ +static inline unsigned Sk255To256(U8CPU value) { + SkASSERT(SkToU8(value) == value); + return value + (value >> 7); +} + /** Multiplify value by 0..256, and shift the result down 8 (i.e. return (value * alpha256) >> 8) */ |