Author: Carlos Lopez <[email protected]>
Date: Wed Aug 8 20:02:38 2012 +0200
Circle Layer: add support for cairo render when the circle is inverted and
semitransparent. No feather yet.
---
synfig-core/src/modules/mod_geometry/circle.cpp | 47 ++++++++++++++++++++++-
1 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/synfig-core/src/modules/mod_geometry/circle.cpp
b/synfig-core/src/modules/mod_geometry/circle.cpp
index 6a99191..0364f11 100644
--- a/synfig-core/src/modules/mod_geometry/circle.cpp
+++ b/synfig-core/src/modules/mod_geometry/circle.cpp
@@ -860,7 +860,7 @@ Circle::accelerated_cairorender(Context
context,cairo_surface_t *surface,int qua
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_restore(cr);
- // ADD feather here
+ // and add the feather
///////////////////
if(!is_solid_color()) // this means that it is just
opaque.
{
@@ -902,12 +902,55 @@ Circle::accelerated_cairorender(Context
context,cairo_surface_t *surface,int qua
cairo_set_operator(cr,
CAIRO_OPERATOR_DEST_OVER);
cairo_paint(cr);
cairo_restore(cr);
- cairo_restore(cr);
}
cairo_destroy(cr);
return true;
}
+ else // inverted but semitransparent
+ {
+ // 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;
+ }
+ // Now let's render the inverted circle in other surface
+ // Initially I'll fill it completely with the alpha
color
+ // Create a similar image with the same dimensions than
the current renddesc
+ cairo_surface_t*
subimage=cairo_surface_create_similar(surface, CAIRO_CONTENT_COLOR_ALPHA,
renddesc.get_w(), renddesc.get_h());
+ cairo_t* subcr=cairo_create(subimage);
+ cairo_set_source_rgba(subcr, r, g, b, a);
+ cairo_paint(subcr);
+ // now remove the area of the intersection circle
+ cairo_save(subcr);
+ // This is the scale and translation values
+ double tx(-tl[0]/pw);
+ double ty(-tl[1]/ph);
+ double sx(1/pw);
+ double sy(1/ph);
+
+ cairo_translate(subcr, tx , ty);
+ cairo_scale(subcr, sx, sy);
+ cairo_arc(subcr, origin[0], origin[1], out_radius, 0.,
2*M_PI);
+ cairo_clip(subcr);
+ cairo_set_operator(subcr, CAIRO_OPERATOR_CLEAR);
+ cairo_paint(subcr);
+ cairo_restore(subcr);
+ // add the feather here
+ ///////////////////////
+ // now let's paint the inverted circle with the hole on
the rendered context
+ cairo_save(cr);
+ cairo_set_source_surface(cr, subimage, 0, 0);
+ cairo_set_operator(cr, CAIRO_OPERATOR_OVER); // TODO
this has to be the real operator
+ cairo_paint_with_alpha(cr, get_amount());
+ cairo_restore(cr);
+ cairo_surface_destroy(subimage);
+ cairo_destroy(subcr);
+ cairo_destroy(cr);
+ return true;
+ }
}
else // not inverted
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