Author: Carlos Lopez <[email protected]>
Date: Thu Apr 18 18:56:27 2013 +0200
CairoColor: add specialization for Blend mode ALPHA_OVER and HARD_LIGHT
---
synfig-core/src/synfig/color.cpp | 51 ++++++++++++++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index c7aecef..ae53747 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -1058,6 +1058,45 @@ blendfunc_HARD_LIGHT(C &a,C &b,float amount)
return blendfunc_ONTO(a,b,amount);
}
+template <>
+CairoColor
+blendfunc_HARD_LIGHT(CairoColor &a, CairoColor &b, float amount)
+{
+ if(amount<0) a=~a, amount=-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();
+
+ rb=b.get_r();
+ gb=b.get_g();
+ bb=b.get_b();
+ ab=b.get_a();
+
+ if(ra>127) rc =255 - (255-(ra*2-255)) * (255-rb)/255.0;
+ else rc= rb*(ra*2)/255.0;
+ if(ga>127) gc =255 - (255-(ga*2-255)) * (255-gb)/255.0;
+ else gc= gb*(ga*2)/255.0;
+ if(ba>127) bc =255 - (255-(ba*2-255)) * (255-bb)/255.0;
+ else bc= bb*(ba*2)/255.0;
+
+ return CairoColor::blend(CairoColor(rc, gc, bc, aa),b,amount,
Color::BLEND_ONTO);
+//
+// if(a.get_r()>half)
a.set_r(one-(one-(a.get_r()*2*one-one))*(one-b.get_r()));
+// else a.set_r(b.get_r()*(a.get_r()*2*one));
+// if(a.get_g()>half)
a.set_g(one-(one-(a.get_g()*2*one-one))*(one-b.get_g()));
+// else a.set_g(b.get_g()*(a.get_g()*2*one));
+// if(a.get_b()>half)
a.set_b(one-(one-(a.get_b()*2*one-one))*(one-b.get_b()));
+// else a.set_b(b.get_b()*(a.get_b()*2*one));
+//
+// return blendfunc_ONTO(a,b,amount);
+}
+
template <class C>
static C
blendfunc_ALPHA_OVER(C &a,C &b,float amount)
@@ -1071,6 +1110,18 @@ blendfunc_ALPHA_OVER(C &a,C &b,float amount)
return blendfunc_STRAIGHT(rm,b,amount);
}
+template <>
+CairoColor
+blendfunc_ALPHA_OVER(CairoColor &a, CairoColor &b, float amount)
+{
+ CairoColor rm(b);
+
+ //multiply the inverse alpha channel with the one below us
+ rm.set_a((255-a.get_a())*b.get_a()/255.0);
+
+ return CairoColor::blend(rm,b,amount, Color::BLEND_STRAIGHT);
+}
+
Color
Color::blend(Color a, Color b,float amount, Color::BlendMethod type)
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