New class Preview Target Cairo

synfig-studio/src/gui/preview.cpp

@@ -40,6 +40,7 @@
 #include <gdkmm/general.h>
 
 #include <synfig/target_scanline.h>
+#include <synfig/target_cairo.h>
 #include <synfig/surface.h>
 
 #include <algorithm>
@@ -76,6 +77,48 @@ using namespace studio;
 
 /* === E N T R Y P O I N T ================================================= */
 
+class studio::Preview::Preview_Target_Cairo : public Target_Cairo
+{
+	Preview *prev;
+public:
+	Preview_Target_Cairo(Preview *prev_): prev(prev_)
+	{
+	}
+
+	virtual bool set_rend_desc(RendDesc *r)
+	{
+		return Target_Cairo::set_rend_desc(r);
+	}
+
+	virtual bool obtain_surface(cairo_surface_t*& surface)
+	{
+		int w=desc.get_w(), h=desc.get_h();
+		surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
+		return true;
+	}
+
+	bool put_surface(cairo_surface_t *surf, synfig::ProgressCallback *cb)
+	{
+		if(!prev)
+			return false;
+		gamma_filter(surf);
+		if(cairo_surface_status(surf))
+		{
+			if(cb) cb->error(_("Cairo Surface bad status"));
+			return false;
+		}
+		FlipbookElem	fe;
+		Preview pr = *prev;
+		float time = get_canvas()->get_time();
+		fe.t = time;
+		fe.surface=cairo_surface_reference(surf);
+		prev->push_back(fe);
+
+		cairo_surface_destroy(surf);
+		return true;
+	}
+};
+
 class studio::Preview::Preview_Target : public Target_Scanline
 {
 	Surface	surface;

synfig-studio/src/gui/preview.h

@@ -68,6 +68,7 @@ class Preview : public sigc::trackable, public etl::shared_object
 	{
 		float						t;
 		Glib::RefPtr<Gdk::Pixbuf>	buf; //at whatever resolution they are rendered at (resized at run time)
+		cairo_surface_t* surface;
 	};
 
 	etl::handle<studio::AsyncRenderer>	renderer;
@@ -91,6 +92,7 @@ class Preview : public sigc::trackable, public etl::shared_object
 
 	//expose the frame information etc.
 	class Preview_Target;
+	class Preview_Target_Cairo;
 	void frame_finish(const Preview_Target *);
 
 	sigc::signal0<void>	sig_changed;
@@ -155,6 +157,7 @@ class Preview : public sigc::trackable, public etl::shared_object
 
 	FlipBook::const_iterator	begin() const {return frames.begin();}
 	FlipBook::const_iterator	end() const	  {return frames.end();}
+	void push_back(FlipbookElem fe) { frames.push_back(fe); }
 
 	void clear() {frames.clear();}