Author: Carlos Lopez <[email protected]>
Date: Tue Jun 5 19:14:03 2012 +0200
CairoColor: implement blend method using blend function templates
---
synfig-core/src/synfig/color.cpp | 41 ++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index fc4f31f..c26598c 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -235,6 +235,7 @@ Color::clamped()const
}
typedef Color (*blendfunc)(Color &,Color &,float);
+typedef CairoColor (*cairoblendfunc)(CairoColor&, CairoColor&, float);
template <class C>
static C
@@ -602,3 +603,43 @@ Color::blend(Color a, Color b,float amount,
Color::BlendMethod type)
return vtable[type](a,b,amount);
}
+
+
+CairoColor
+CairoColor::blend(CairoColor a, CairoColor b, float amount, Color::BlendMethod
type)
+{
+ // No matter what blend method is being used,
+ // if the amount is equal to zero, then only B
+ // will shine through
+ if(fabsf(amount)<=COLOR_EPSILON)return b;
+
+ assert(type<Color::BLEND_END);
+
+ const static cairoblendfunc vtable[Color::BLEND_END]=
+ {
+ blendfunc_COMPOSITE<CairoColor>, // 0
+ blendfunc_STRAIGHT<CairoColor>,
+ blendfunc_BRIGHTEN<CairoColor>,
+ blendfunc_DARKEN<CairoColor>,
+ blendfunc_ADD<CairoColor>,
+ blendfunc_SUBTRACT<CairoColor>, // 5
+ blendfunc_MULTIPLY<CairoColor>,
+ blendfunc_DIVIDE<CairoColor>,
+ blendfunc_COLOR<CairoColor>,
+ blendfunc_HUE<CairoColor>,
+ blendfunc_SATURATION<CairoColor>, // 10
+ blendfunc_LUMINANCE<CairoColor>,
+ blendfunc_BEHIND<CairoColor>,
+ blendfunc_ONTO<CairoColor>,
+ blendfunc_ALPHA_BRIGHTEN<CairoColor>,
+ blendfunc_ALPHA_DARKEN<CairoColor>, // 15
+ blendfunc_SCREEN<CairoColor>,
+ blendfunc_HARD_LIGHT<CairoColor>,
+ blendfunc_DIFFERENCE<CairoColor>,
+ blendfunc_ALPHA_OVER<CairoColor>,
+ blendfunc_OVERLAY<CairoColor>, // 20
+ blendfunc_STRAIGHT_ONTO<CairoColor>,
+ };
+
+ return vtable[type](a,b,amount);
+}
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