diff options
| author |  bungeman@google.com <bungeman@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-07-30 20:40:50 +0000 |
|---|---|---|
| committer | bungeman@google.com <bungeman@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-07-30 20:40:50 +0000 |
| commit | 97efada074e4806479f1350ab1508939c2fdcb53 (patch) | |
| tree | 374659467fad6bb854be612ec5bcb8398a44c97a /include/core/SkColorPriv.h | |
| parent | fa3d892f2e3beba39ccb9957be78aad529521740 (diff) | |
Gamma correcting masks.
https://codereview.appspot.com/6244068/
git-svn-id: http://skia.googlecode.com/svn/trunk@4841 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'include/core/SkColorPriv.h')
| -rw-r--r-- | include/core/SkColorPriv.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/core/SkColorPriv.h b/include/core/SkColorPriv.h index a2a9c58b25..073a4f58f8 100644 --- a/include/core/SkColorPriv.h +++ b/include/core/SkColorPriv.h @@ -18,6 +18,20 @@ #include "SkColor.h" #include "SkMath.h" +///@{ +/** See ITU-R Recommendation BT.709 at http://www.itu.int/rec/R-REC-BT.709/ .*/ +#define SK_ITU_BT709_LUM_COEFF_R (0.2126f) +#define SK_ITU_BT709_LUM_COEFF_G (0.7152f) +#define SK_ITU_BT709_LUM_COEFF_B (0.0722f) +///@} + +///@{ +/** A float value which specifies this channel's contribution to luminance. */ +#define SK_LUM_COEFF_R SK_ITU_BT709_LUM_COEFF_R +#define SK_LUM_COEFF_G SK_ITU_BT709_LUM_COEFF_G +#define SK_LUM_COEFF_B SK_ITU_BT709_LUM_COEFF_B +///@} + /** Turn 0..255 into 0..256 by adding 1 at the half-way point. Used to turn a byte into a scale value, so that we can say scale * value >> 8 instead of alpha * value / 255. |