Author: Carlos Lopez <[email protected]>
Date: Mon Apr 8 21:02:56 2013 +0200
CairoColor: add specialization for Blend mode COMPOSITE
---
synfig-core/src/synfig/color.cpp | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index 6f4d9c2..68b3f33 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -282,6 +282,37 @@ blendfunc_COMPOSITE(C &src,C &dest,float amount)
return dest;
}
+//Specialization for CairoColor
+template <>
+CairoColor
+blendfunc_COMPOSITE(CairoColor &a, CairoColor &b, float amount)
+{
+ int ra, ga, ba, aa;
+ int rb, gb, bb, ab;
+ int rc, gc, bc, ac;
+
+ ra=a.get_r();
+ ga=a.get_g();
+ ba=a.get_b();
+ aa=a.get_a()*amount;
+
+ rb=b.get_r();
+ gb=b.get_g();
+ bb=b.get_b();
+ ab=b.get_a();
+
+ ac=aa+(ab*(255-aa))/255;
+ if(ac==0) return CairoColor::alpha();
+
+ rc=(ra*aa+rb*ab*(255-aa)/255)/255;
+ gc=(ga*aa+gb*ab*(255-aa)/255)/255;
+ bc=(ba*aa+bb*ab*(255-aa)/255)/255;
+
+ return CairoColor(rc, gc, bc, ac);
+
+}
+
+
template <class C>
static C
blendfunc_STRAIGHT(C &src,C &bg,float amount)
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