PaintSurface.h

/* Copyright (C) 2015 Marc Boris Duerner
   Copyright (C) 2015 Laurentiu-Gheorghe Crisan
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  As a special exception, you may use this file as part of a free
  software library without restriction. Specifically, if other files
  instantiate templates or use macros or inline functions from this
  file, or you compile this file and link it with other files to
  produce an executable, this file does not by itself cause the
  resulting executable to be covered by the GNU General Public
  License. This exception does not however invalidate any other
  reasons why the executable file might be covered by the GNU Library
  General Public License.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
  MA 02110-1301 USA
*/
 
#ifndef Pt_Gfx_PaintSurface_h
#define Pt_Gfx_PaintSurface_h
 
#include <Pt/Gfx/Api.h>
#include <Pt/Gfx/ImageFormat.h>
#include <Pt/Gfx/Scaling.h>
#include <Pt/NonCopyable.h>
#include <Pt/System/Path.h>
 
#include <vector>
 
namespace Pt {
 
namespace Gfx {
 
class PaintContext;

class PT_GFX_API PaintSurface : private NonCopyable
{
    friend class PainterBase;
    friend class PaintContext;
    friend class Canvas;
 
    protected:
        PaintSurface();
 
    public:
        virtual ~PaintSurface();
        
        const Gfx::ImageFormat& format() const;

        const Gfx::SizeF& size() const;

        const Scaling& scaling() const;

        Canvas* getCanvas(Canvas* canvas);

        void sync();

        void finish();
 
    protected:
        void invalidate();
 
    protected:
        virtual const Gfx::ImageFormat& onGetFormat() const = 0;

        virtual const Gfx::SizeF& onGetSize() const = 0;

        virtual const Scaling& onGetScaling() const = 0;
 
    protected:
        virtual Gfx::Canvas* onGetCanvas(Gfx::Canvas* reuse);

        virtual Gfx::Canvas* onCreateCanvas(Gfx::Canvas* reuse) = 0;
        
        virtual void onReleaseCanvas() = 0;

        virtual void onSync() = 0;

        virtual void onFinish() = 0;
 
    private:
        void attachPainter(PainterBase& painter);

        void detachPainter(PainterBase& painter);

        void attachContext(PaintContext& context);

        void detachContext(PaintContext& context);
 
    private:
        void onDetachCanvas(Canvas& canvas);
 
    private:
        Canvas*       _canvas;
        PainterBase*  _painter;
        PaintContext* _context;
        void*     _reserved;
};
 
} // namespace
 
} // namespace
 
#endif