Author: Carlos Lopez <[email protected]>
Date: Fri Nov 23 20:13:31 2012 +0100
Cairo Operators: Add support for blend mode ALPHA_DARKEN using a custom blend
function.
---
synfig-core/src/synfig/cairo_operators.cpp | 2 +-
synfig-core/src/synfig/color.cpp | 35 ++++++++++++++++++++++++++++
2 files changed, 36 insertions(+), 1 deletions(-)
diff --git a/synfig-core/src/synfig/cairo_operators.cpp
b/synfig-core/src/synfig/cairo_operators.cpp
index b5e2816..24feba4 100644
--- a/synfig-core/src/synfig/cairo_operators.cpp
+++ b/synfig-core/src/synfig/cairo_operators.cpp
@@ -235,6 +235,7 @@ void cairo_paint_with_alpha_operator(cairo_t* acr, float
alpha, Color::BlendMeth
case Color::BLEND_SUBTRACT:
case Color::BLEND_DIFFERENCE:
case Color::BLEND_DIVIDE:
+ case Color::BLEND_ALPHA_DARKEN:
{
cairo_push_group(cr);
cairo_paint(cr);
@@ -278,7 +279,6 @@ void cairo_paint_with_alpha_operator(cairo_t* acr, float
alpha, Color::BlendMeth
}
case Color::BLEND_COLOR:
case Color::BLEND_ALPHA_BRIGHTEN:
- case Color::BLEND_ALPHA_DARKEN:
default:
{
cairo_push_group(cr);
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index c39c95b..71f246b 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -637,6 +637,41 @@ blendfunc_ALPHA_DARKEN(C &a,C &b,float amount)
return b;
}
+//Specialization for CairoColor
+template <>
+static CairoColor
+blendfunc_ALPHA_DARKEN(CairoColor &a, CairoColor &b, float amount)
+{
+ unsigned char ra, ga, ba, aa;
+ unsigned char rb, gb, bb, ab;
+ unsigned char 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();
+
+ ac=aa*amount;
+ if(ac > ab)
+ {
+ float acaa=(aa*amount)/aa;
+ rc=ra*acaa;
+ gc=ga*acaa;
+ bc=ba*acaa;
+ return CairoColor(rc, gc, bc, ac);
+ }
+ else
+ return b;
+
+
+}
+
+
template <class C>
static C
blendfunc_SCREEN(C &a,C &b,float amount)
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