cairo_compositor.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifndef CAIRO_COMPOSITOR_H_
#define CAIRO_COMPOSITOR_H_
 
#include <gal/compositor.h>
#include <gal/gal_display_options.h>
#include <cairo.h>
 
#include <cstdint>
#include <deque>
 
namespace KIGFX
{
class CAIRO_COMPOSITOR : public COMPOSITOR
{
public:
 CAIRO_COMPOSITOR( cairo_t** aMainContext );
 virtual ~CAIRO_COMPOSITOR();
 
 virtual void Initialize() override;
 
 virtual void Resize( unsigned int aWidth, unsigned int aHeight ) override;
 
 virtual unsigned int CreateBuffer() override;
 
 inline virtual unsigned int GetBuffer() const override
 {
 return m_current + 1;
 }
 
 virtual void SetBuffer( unsigned int aBufferHandle ) override;
 
 virtual void Begin() override;
 
 virtual void ClearBuffer( const COLOR4D& aColor ) override;
 
 void DrawBuffer( unsigned int aSourceHandle, unsigned int aDestHandle, cairo_operator_t op );
 
 virtual void DrawBuffer( unsigned int aBufferHandle ) override;
 
 virtual void Present() override;
 
 void SetAntialiasingMode( CAIRO_ANTIALIASING_MODE aMode ); // clears all buffers
 CAIRO_ANTIALIASING_MODE GetAntialiasingMode() const
 {
 switch( m_currentAntialiasingMode )
 {
 case CAIRO_ANTIALIAS_FAST:
 return CAIRO_ANTIALIASING_MODE::FAST;
 case CAIRO_ANTIALIAS_GOOD:
 return CAIRO_ANTIALIASING_MODE::GOOD;
 default:
 return CAIRO_ANTIALIASING_MODE::NONE;
 }
 }
 
 inline virtual void SetMainContext( cairo_t* aMainContext )
 {
 m_mainContext = aMainContext;
 
 // Use the context's transformation matrix
 cairo_get_matrix( m_mainContext, &m_matrix );
 }
 
protected:
 void clean();
 
 unsigned int usedBuffers()
 {
 return m_buffers.size();
 }
 
 typedef uint8_t* BitmapPtr;
 struct CAIRO_BUFFER
 {
 cairo_t* context; 
 cairo_surface_t* surface; 
 BitmapPtr bitmap; 
 };
 
 unsigned int m_current; 
 typedef std::deque<CAIRO_BUFFER> CAIRO_BUFFERS;
 
 cairo_t** m_currentContext;
 
 cairo_t* m_mainContext;
 
 cairo_matrix_t m_matrix;
 
 CAIRO_BUFFERS m_buffers;
 
 unsigned int m_stride; 
 unsigned int m_bufferSize; 
 
 cairo_antialias_t m_currentAntialiasingMode;
};
} // namespace KIGFX
 
#endif /* COMPOSITOR_H_ */