diff options
Diffstat (limited to 'draw/draw_blend.c')
| -rw-r--r-- | draw/draw_blend.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/draw/draw_blend.c b/draw/draw_blend.c index 2f72ec9c..6775e79d 100644 --- a/draw/draw_blend.c +++ b/draw/draw_blend.c @@ -380,9 +380,9 @@ fz_blend_separable_nonisolated(byte * restrict bp, byte * restrict sp, int n, in /* Because we are a non-isolated group, we need to * 'uncomposite' before we blend (recomposite). * We assume that normal blending has been done inside - * the group, so: ra.rc = (1-ha).bc + ha.sc + * the group, so: ra.rc = (1-ha).bc + ha.sc * A bit of rearrangement, and that gives us that: - * sc = (ra.rc - bc)/ha + bc + * sc = (ra.rc - bc)/ha + bc * Now, the result of the blend was stored in src, so: */ int invha = ha ? 255 * 256 / ha : 0; @@ -447,9 +447,9 @@ fz_blend_nonseparable_nonisolated(byte * restrict bp, byte * restrict sp, int w, * need to 'uncomposite' before we blend * (recomposite). We assume that normal * blending has been done inside the group, - * so: ra.rc = (1-ha).bc + ha.sc + * so: ra.rc = (1-ha).bc + ha.sc * A bit of rearrangement, and that gives us - * that: sc = (ra.rc - bc)/ha + bc + * that: sc = (ra.rc - bc)/ha + bc * Now, the result of the blend was stored in * src, so: */ int invha = ha ? 255 * 256 / ha : 0; |