Author: Carlos Lopez <genet...@gmail.com>
Date: Sun Apr 14 20:30:36 2013 +0200
CairoColor: add specialization for Blend mode STRAIGHT
---
synfig-core/src/synfig/color.cpp | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index 0b14090..249ab19 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -351,6 +351,41 @@ blendfunc_STRAIGHT(C &src,C &bg,float amount)
return out;
}
+//Specialization for CairoColor
+template <>
+CairoColor
+blendfunc_STRAIGHT(CairoColor &a, CairoColor &b, float amount)
+{
+ int ra, ga, ba, aa; //src
+ int rb, gb, bb, ab; //bg
+ int rc, gc, bc;
+ float ac; //out
+
+ ra=a.get_r();
+ ga=a.get_g();
+ ba=a.get_b();
+ aa=a.get_a();
+
+ rb=b.get_r();
+ gb=b.get_g();
+ bb=b.get_b();
+ ab=b.get_a();
+
+ ac=(aa-ab)*amount+ab;
+
+ // if ac!=0.0
+ if(fabsf(ac)>COLOR_EPSILON)
+ {
+ rc= ((ra*aa-rb*ab)*amount + rb*ab)/ac;
+ gc= ((ga*aa-gb*ab)*amount + gb*ab)/ac;
+ bc= ((ba*aa-bb*ab)*amount + bb*ab)/ac;
+ return CairoColor(rc, gc, bc, ac);
+ }
+ else
+ return CairoColor::alpha();
+}
+
+
template <class C>
static C
blendfunc_ONTO(C &a,C &b,float amount)
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