Author: Carlos Lopez <[email protected]>
Date: Fri Nov 23 19:40:03 2012 +0100
Cairo Operators: Add support for blend mode DIFFERENCE using a custom blend
function.
---
synfig-core/src/synfig/cairo_operators.cpp | 2 +-
synfig-core/src/synfig/color.cpp | 32 ++++++++++++++++++++++++++++
2 files changed, 33 insertions(+), 1 deletions(-)
diff --git a/synfig-core/src/synfig/cairo_operators.cpp
b/synfig-core/src/synfig/cairo_operators.cpp
index 21a4c06..b5e2816 100644
--- a/synfig-core/src/synfig/cairo_operators.cpp
+++ b/synfig-core/src/synfig/cairo_operators.cpp
@@ -233,6 +233,7 @@ void cairo_paint_with_alpha_operator(cairo_t* acr, float
alpha, Color::BlendMeth
}
case Color::BLEND_ADD:
case Color::BLEND_SUBTRACT:
+ case Color::BLEND_DIFFERENCE:
case Color::BLEND_DIVIDE:
{
cairo_push_group(cr);
@@ -275,7 +276,6 @@ void cairo_paint_with_alpha_operator(cairo_t* acr, float
alpha, Color::BlendMeth
cairo_pattern_destroy(pattern);
break;
}
- case Color::BLEND_DIFFERENCE:
case Color::BLEND_COLOR:
case Color::BLEND_ALPHA_BRIGHTEN:
case Color::BLEND_ALPHA_DARKEN:
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index 3f2e808..c39c95b 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -462,6 +462,38 @@ blendfunc_DIFFERENCE(C &a,C &b,float amount)
return b;
}
+//Specialization for CairoColor
+template <>
+static CairoColor
+blendfunc_DIFFERENCE(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();
+
+ rb=b.get_r();
+ gb=b.get_g();
+ bb=b.get_b();
+ ab=b.get_a();
+
+ int aba=ab*amount;
+
+ rc=abs(rb-(ra*aba)/255);
+ gc=abs(gb-(ga*aba)/255);
+ bc=abs(bb-(ba*aba)/255);
+ ac=ab;
+
+ return CairoColor(rc, gc, bc, ac);
+}
+
+
+
+
template <class C>
static C
blendfunc_MULTIPLY(C &a,C &b,float amount)
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