128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2013 CERN
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file cairo_compositor.h
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* @brief Class that handles multitarget rendering (ie. to different textures/surfaces) and
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* later compositing into a single image (Cairo flavour).
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*/
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#ifndef CAIRO_COMPOSITOR_H_
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#define CAIRO_COMPOSITOR_H_
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#include <gal/compositor.h>
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#include <cairo.h>
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#include <boost/smart_ptr/shared_array.hpp>
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#include <deque>
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namespace KiGfx
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{
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class CAIRO_COMPOSITOR : public COMPOSITOR
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{
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public:
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CAIRO_COMPOSITOR( cairo_t** aMainContext );
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virtual ~CAIRO_COMPOSITOR();
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/// @copydoc COMPOSITOR::Initialize()
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virtual void Initialize();
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/// @copydoc COMPOSITOR::Resize()
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virtual void Resize( unsigned int aWidth, unsigned int aHeight );
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/// @copydoc COMPOSITOR::CreateBuffer()
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virtual unsigned int CreateBuffer();
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/// @copydoc COMPOSITOR::GetBuffer()
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inline virtual unsigned int GetBuffer() const
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{
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return m_current + 1;
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}
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/// @copydoc COMPOSITOR::SetBuffer()
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virtual void SetBuffer( unsigned int aBufferHandle );
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/// @copydoc COMPOSITOR::ClearBuffer()
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virtual void ClearBuffer();
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/// @copydoc COMPOSITOR::DrawBuffer()
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virtual void DrawBuffer( unsigned int aBufferHandle );
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/**
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* Function SetMainContext()
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* Sets a context to be treated as the main context (ie. as a target of buffers rendering and
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* as a source of settings for newly created buffers).
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*
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* @param aMainContext is the context that should be treated as the main one.
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*/
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inline virtual void SetMainContext( cairo_t* aMainContext )
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{
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m_mainContext = aMainContext;
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// Use the context's transformation matrix
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cairo_get_matrix( m_mainContext, &m_matrix );
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}
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protected:
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typedef boost::shared_array<unsigned int> BitmapPtr;
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typedef struct
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{
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cairo_t* context; ///< Main texture handle
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cairo_surface_t* surface; ///< Point to which an image from texture is attached
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BitmapPtr bitmap; ///< Pixel storage
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} CAIRO_BUFFER;
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unsigned int m_current; ///< Currently used buffer handle
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typedef std::deque<CAIRO_BUFFER> CAIRO_BUFFERS;
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/// Pointer to the current context, so it can be changed
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cairo_t** m_currentContext;
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/// Rendering target used for compositing (the main display)
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cairo_t* m_mainContext;
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/// Transformation matrix
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cairo_matrix_t m_matrix;
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/// Stores information about initialized buffers
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CAIRO_BUFFERS m_buffers;
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unsigned int m_stride; ///< Stride to use given the desired format and width
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unsigned int m_bufferSize; ///< Amount of memory needed to store a buffer
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/**
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* Function clean()
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* performs freeing of resources.
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*/
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void clean();
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/// Returns number of currently used buffers
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unsigned int usedBuffers()
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{
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return m_buffers.size();
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}
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};
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} // namespace KiGfx
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#endif /* COMPOSITOR_H_ */
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