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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2013 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* 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
*/
/**
* @file cairo_compositor.h
* @brief Class that handles multitarget rendering (ie. to different textures/surfaces) and
* later compositing into a single image (Cairo flavour).
*/
#ifndef CAIRO_COMPOSITOR_H_
#define CAIRO_COMPOSITOR_H_
#include <gal/compositor.h>
#include <cairo.h>
#include <boost/smart_ptr/shared_array.hpp>
#include <deque>
namespace KIGFX
{
class CAIRO_COMPOSITOR : public COMPOSITOR
{
public:
CAIRO_COMPOSITOR( cairo_t** aMainContext );
virtual ~CAIRO_COMPOSITOR();
/// @copydoc COMPOSITOR::Initialize()
virtual void Initialize();
/// @copydoc COMPOSITOR::Resize()
virtual void Resize( unsigned int aWidth, unsigned int aHeight );
/// @copydoc COMPOSITOR::CreateBuffer()
virtual unsigned int CreateBuffer();
/// @copydoc COMPOSITOR::GetBuffer()
inline virtual unsigned int GetBuffer() const
{
return m_current + 1;
}
/// @copydoc COMPOSITOR::SetBuffer()
virtual void SetBuffer( unsigned int aBufferHandle );
/// @copydoc COMPOSITOR::ClearBuffer()
virtual void ClearBuffer();
/// @copydoc COMPOSITOR::DrawBuffer()
virtual void DrawBuffer( unsigned int aBufferHandle );
/**
* Function SetMainContext()
* Sets a context to be treated as the main context (ie. as a target of buffers rendering and
* as a source of settings for newly created buffers).
*
* @param aMainContext is the context that should be treated as the main one.
*/
inline virtual void SetMainContext( cairo_t* aMainContext )
{
m_mainContext = aMainContext;
// Use the context's transformation matrix
cairo_get_matrix( m_mainContext, &m_matrix );
}
protected:
typedef boost::shared_array<unsigned int> BitmapPtr;
typedef struct
{
cairo_t* context; ///< Main texture handle
cairo_surface_t* surface; ///< Point to which an image from texture is attached
BitmapPtr bitmap; ///< Pixel storage
} CAIRO_BUFFER;
unsigned int m_current; ///< Currently used buffer handle
typedef std::deque<CAIRO_BUFFER> CAIRO_BUFFERS;
/// Pointer to the current context, so it can be changed
cairo_t** m_currentContext;
/// Rendering target used for compositing (the main display)
cairo_t* m_mainContext;
/// Transformation matrix
cairo_matrix_t m_matrix;
/// Stores information about initialized buffers
CAIRO_BUFFERS m_buffers;
unsigned int m_stride; ///< Stride to use given the desired format and width
unsigned int m_bufferSize; ///< Amount of memory needed to store a buffer
/**
* Function clean()
* performs freeing of resources.
*/
void clean();
/// Returns number of currently used buffers
unsigned int usedBuffers()
{
return m_buffers.size();
}
};
} // namespace KIGFX
#endif /* COMPOSITOR_H_ */
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