Author: Carlos Lopez <genet...@gmail.com>
Date: Wed Aug 15 12:35:28 2012 +0200
LinearGradient: add support for Cairo render. It has some bugs yet related to
combinations of loop and zigzag.
---
.../src/modules/mod_gradient/lineargradient.cpp | 118 ++++++++++++++++++++
.../src/modules/mod_gradient/lineargradient.h | 3 +
2 files changed, 121 insertions(+), 0 deletions(-)
diff --git a/synfig-core/src/modules/mod_gradient/lineargradient.cpp
b/synfig-core/src/modules/mod_gradient/lineargradient.cpp
index 8b59d64..19cd65c 100644
--- a/synfig-core/src/modules/mod_gradient/lineargradient.cpp
+++ b/synfig-core/src/modules/mod_gradient/lineargradient.cpp
@@ -268,3 +268,121 @@ LinearGradient::accelerated_render(Context
context,Surface *surface,int quality,
return true;
}
+bool
+LinearGradient::accelerated_cairorender(Context context,cairo_surface_t
*surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
+{
+ const Point tl(renddesc.get_tl());
+ const Point br(renddesc.get_br());
+
+ const int w(renddesc.get_w());
+ const int h(renddesc.get_h());
+
+ // Width and Height of a pixel
+ const Real pw = (br[0] - tl[0]) / w;
+ const Real ph = (br[1] - tl[1]) / h;
+
+ const double tx(-tl[0]/pw);
+ const double ty(-tl[1]/ph);
+ const double sx(1/pw);
+ const double sy(1/ph);
+
+ cairo_t* cr=cairo_create(surface);
+ cairo_save(cr);
+ cairo_pattern_t* pattern=cairo_pattern_create_linear(p1[0], p1[1],
p2[0], p2[1]);
+ bool cpoints_all_opaque=compile_gradient(pattern, gradient);
+ if(loop)
+ cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
+ if(quality>8) cairo_pattern_set_filter(pattern, CAIRO_FILTER_FAST);
+ else if(quality>=4) cairo_pattern_set_filter(pattern,
CAIRO_FILTER_GOOD);
+ else cairo_pattern_set_filter(pattern, CAIRO_FILTER_BEST);
+ if(
+ !
+ (is_solid_color() ||
+ cpoints_all_opaque && get_blend_method()==Color::BLEND_COMPOSITE &&
get_amount()==1.0)
+ )
+ {
+ // Initially render what's behind us
+
if(!context.accelerated_cairorender(surface,quality,renddesc,cb))
+ {
+ if(cb)cb->error(strprintf(__FILE__"%d: Accelerated
Cairo Renderer Failure",__LINE__));
+ cairo_destroy(cr);
+ return false;
+ }
+ }
+ cairo_translate(cr, tx , ty);
+ cairo_scale(cr, sx, sy);
+ cairo_set_operator(cr, CAIRO_OPERATOR_OVER); // TODO: this has to be
the real operator
+ cairo_set_source(cr, pattern);
+ cairo_paint_with_alpha(cr, get_amount());
+
+ cairo_pattern_destroy(pattern); // Not needed more
+ cairo_restore(cr);
+ cairo_destroy(cr);
+
+}
+
+bool
+LinearGradient::compile_gradient(cairo_pattern_t* pattern, Gradient
mygradient)const
+{
+ bool cpoints_all_opaque=true;
+ Gradient::const_iterator iter;
+ mygradient.sort();
+ if(zigzag)
+ {
+ Gradient zgradient;
+ for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
+ {
+ Gradient::CPoint cp=*iter;
+ cp.pos=cp.pos/2;
+ zgradient.push_back(cp);
+ }
+ for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
+ {
+ Gradient::CPoint cp=*iter;
+ cp.pos=1.0-cp.pos/2;
+ zgradient.push_back(cp);
+ }
+ mygradient=zgradient;
+ }
+ if(loop)
+ {
+ Gradient::CPoint cp=*(--mygradient.end());
+ float a=cp.color.get_a();
+ float r=cp.color.get_r();
+ float g=cp.color.get_g();
+ float b=cp.color.get_b();
+ cairo_pattern_add_color_stop_rgba(pattern, 0.0, r, g, b, a);
+ cp=*mygradient.begin();
+ a=cp.color.get_a();
+ r=cp.color.get_r();
+ g=cp.color.get_g();
+ b=cp.color.get_b();
+ cairo_pattern_add_color_stop_rgba(pattern, 0.0, r, g, b, a);
+ }
+ for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
+ {
+ Gradient::CPoint cp=*iter;
+ float a=cp.color.get_a();
+ float r=cp.color.get_r();
+ float g=cp.color.get_g();
+ float b=cp.color.get_b();
+ cairo_pattern_add_color_stop_rgba(pattern, cp.pos, r, g, b, a);
+ if(a!=1.0) cpoints_all_opaque=false;
+ }
+ if(loop)
+ {
+ Gradient::CPoint cp=*(--mygradient.end());
+ float a=cp.color.get_a();
+ float r=cp.color.get_r();
+ float g=cp.color.get_g();
+ float b=cp.color.get_b();
+ cairo_pattern_add_color_stop_rgba(pattern, 1.0, r, g, b, a);
+ cp=*mygradient.begin();
+ a=cp.color.get_a();
+ r=cp.color.get_r();
+ g=cp.color.get_g();
+ b=cp.color.get_b();
+ cairo_pattern_add_color_stop_rgba(pattern, 1.0, r, g, b, a);
+ }
+ return cpoints_all_opaque;
+}
\ No newline at end of file
diff --git a/synfig-core/src/modules/mod_gradient/lineargradient.h
b/synfig-core/src/modules/mod_gradient/lineargradient.h
index 7176d80..db6096f 100644
--- a/synfig-core/src/modules/mod_gradient/lineargradient.h
+++ b/synfig-core/src/modules/mod_gradient/lineargradient.h
@@ -61,6 +61,7 @@ private:
synfig::Color color_func(const synfig::Point &x, float
supersample=0)const;
float calc_supersample(const synfig::Point &x, float pw,float ph)const;
+ bool compile_gradient(cairo_pattern_t* pattern, Gradient gradient)const;
public:
LinearGradient();
@@ -69,6 +70,8 @@ public:
virtual ValueBase get_param(const String ¶m)const;
virtual Color get_color(Context context, const Point &pos)const;
virtual bool accelerated_render(Context context,Surface *surface,int
quality, const RendDesc &renddesc, ProgressCallback *cb)const;
+ virtual bool accelerated_cairorender(Context context,cairo_surface_t
*surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;
+
synfig::Layer::Handle hit_check(synfig::Context context, const
synfig::Point &point)const;
virtual Vocab get_param_vocab()const;
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