Author: Carlos Lopez <[email protected]>
Date: Sat Jun 9 13:23:40 2012 +0200
CairoSurface: basic structure.
---
synfig-core/src/synfig/surface.h | 55 +++++++++++++++++++++++++++++++++++++-
1 files changed, 54 insertions(+), 1 deletions(-)
diff --git a/synfig-core/src/synfig/surface.h b/synfig-core/src/synfig/surface.h
index 4195808..a1da7b0 100644
--- a/synfig-core/src/synfig/surface.h
+++ b/synfig-core/src/synfig/surface.h
@@ -117,13 +117,34 @@ public:
void blit_to(alpha_pen& DEST_PEN, int x, int y, int w, int h);
}; // END of class Surface
+
+/*! \class CairoSurface
+ ** \brief Generic Cairo backed surface. It allows to create a image surface
+ ** equivalent to the current backend for custom modifications purposes.
+ ** \todo writeme
+ */
+class CairoSurface : public etl::surface<CairoColor, CairoColor,
CairoColorPrep>
+{
+public:
+ typedef CairoColor value_type;
+ class alpha_pen;
+
+ CairoSurface() { }
+
+ void clear();
+
+ void set_wh(int w, int h, int pitch=0);
+
+}; // END of class Surface
+
+
#ifndef DOXYGEN_SKIP
/*! \internal Used by Pen_Alpha */
template <class C, typename A=Color::value_type>
struct _BlendFunc
{
- typename C::BlendMethod blend_method;
+ Color::BlendMethod blend_method;
_BlendFunc(typename Color::BlendMethod b=
Color::BLEND_COMPOSITE):blend_method(b) { }
@@ -163,6 +184,38 @@ public:
Color::BlendMethod get_blend_method()const { return
affine_func_.blend_method; }
}; // END of class Surface::alpha_pen
+
+
+/*! \class CairoSurface::alpha_pen
+ ** \brief Alpha-Blending Pen
+ **
+ ** This pen works like a normal alpha pen, except that it supports
+ ** a variety of blending methods. Use set_blend_method() to select
+ ** which blending method you want to use.
+ ** The default blending method is Color::BLEND_COMPOSITE.
+ ** \see Color::BlendMethod
+ */
+class CairoSurface::alpha_pen : public etl::alpha_pen<
etl::generic_pen<CairoColor, CairoColor>, float, _BlendFunc<CairoColor> >
+{
+public:
+ alpha_pen() { }
+ alpha_pen(const etl::alpha_pen< etl::generic_pen<CairoColor,
CairoColor>, float, _BlendFunc<CairoColor> > &x):
+ etl::alpha_pen< etl::generic_pen<CairoColor, CairoColor>, float,
_BlendFunc<CairoColor> >(x)
+ { }
+
+ alpha_pen(const etl::generic_pen<CairoColor, CairoColor>& pen, const
float &a = 1, const _BlendFunc<CairoColor> &func = _BlendFunc<CairoColor>()):
+ etl::alpha_pen< etl::generic_pen<CairoColor, CairoColor>, float,
_BlendFunc<CairoColor> >(pen,a,func)
+ { }
+
+ //! Sets the blend method to that described by \a method
+ void set_blend_method(Color::BlendMethod method) {
affine_func_.blend_method=method; }
+
+ //! Returns the blend method being used for this pen
+ Color::BlendMethod get_blend_method()const { return
affine_func_.blend_method; }
+}; // END of class CairoSurface::alpha_pen
+
+
+
//! Creates a target that will render to \a surface
etl::handle<Target_Scanline> surface_target(Surface *surface);
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