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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:O//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.cpp
* @brief Class that handles multitarget rendering (ie. to different textures/surfaces) and
* later compositing into a single image (Cairo flavour).
*/
#include <gal/cairo/cairo_compositor.h>
#include <wx/log.h>
using namespace KIGFX;
CAIRO_COMPOSITOR::CAIRO_COMPOSITOR( cairo_t** aMainContext ) :
m_current( 0 ), m_currentContext( aMainContext ), m_mainContext( *aMainContext )
{
// Do not have uninitialized members:
cairo_matrix_init_identity( &m_matrix );
m_stride = 0;
m_bufferSize = 0;
}
CAIRO_COMPOSITOR::~CAIRO_COMPOSITOR()
{
clean();
}
void CAIRO_COMPOSITOR::Initialize()
{
// Nothing has to be done
}
void CAIRO_COMPOSITOR::Resize( unsigned int aWidth, unsigned int aHeight )
{
clean();
assert( aWidth > 0 );
assert( aHeight > 0 );
m_width = aWidth;
m_height = aHeight;
m_stride = cairo_format_stride_for_width( CAIRO_FORMAT_ARGB32, m_width );
m_bufferSize = m_stride * m_height;
}
unsigned int CAIRO_COMPOSITOR::CreateBuffer()
{
// Pixel storage
BitmapPtr bitmap( new unsigned int[m_bufferSize] );
memset( bitmap.get(), 0x00, m_bufferSize * sizeof(int) );
// Create the Cairo surface
cairo_surface_t* surface = cairo_image_surface_create_for_data(
(unsigned char*) bitmap.get(),
CAIRO_FORMAT_ARGB32, m_width,
m_height, m_stride );
cairo_t* context = cairo_create( surface );
#ifdef __WXDEBUG__
cairo_status_t status = cairo_status( context );
wxASSERT_MSG( status == CAIRO_STATUS_SUCCESS, wxT( "Cairo context creation error" ) );
#endif /* __WXDEBUG__ */
// Set default settings for the buffer
cairo_set_antialias( context, CAIRO_ANTIALIAS_SUBPIXEL );
cairo_set_line_join( context, CAIRO_LINE_JOIN_ROUND );
cairo_set_line_cap( context, CAIRO_LINE_CAP_ROUND );
// Use the same transformation matrix as the main context
cairo_get_matrix( m_mainContext, &m_matrix );
cairo_set_matrix( context, &m_matrix );
// Store the new buffer
CAIRO_BUFFER buffer = { context, surface, bitmap };
m_buffers.push_back( buffer );
return usedBuffers();
}
void CAIRO_COMPOSITOR::SetBuffer( unsigned int aBufferHandle )
{
wxASSERT_MSG( aBufferHandle <= usedBuffers(), wxT( "Tried to use a not existing buffer" ) );
// Get currently used transformation matrix, so it can be applied to the new buffer
cairo_get_matrix( *m_currentContext, &m_matrix );
m_current = aBufferHandle - 1;
*m_currentContext = m_buffers[m_current].context;
// Apply the current transformation matrix
cairo_set_matrix( *m_currentContext, &m_matrix );
}
void CAIRO_COMPOSITOR::ClearBuffer()
{
// Clear the pixel storage
memset( m_buffers[m_current].bitmap.get(), 0x00, m_bufferSize * sizeof(int) );
}
void CAIRO_COMPOSITOR::DrawBuffer( unsigned int aBufferHandle )
{
wxASSERT_MSG( aBufferHandle <= usedBuffers(), wxT( "Tried to use a not existing buffer" ) );
// Reset the transformation matrix, so it is possible to composite images using
// screen coordinates instead of world coordinates
cairo_get_matrix( m_mainContext, &m_matrix );
cairo_identity_matrix( m_mainContext );
// Draw the selected buffer contents
cairo_set_source_surface( m_mainContext, m_buffers[aBufferHandle - 1].surface, 0.0, 0.0 );
cairo_paint( m_mainContext );
// Restore the transformation matrix
cairo_set_matrix( m_mainContext, &m_matrix );
}
void CAIRO_COMPOSITOR::clean()
{
CAIRO_BUFFERS::const_iterator it;
for( it = m_buffers.begin(); it != m_buffers.end(); ++it )
{
cairo_destroy( it->context );
cairo_surface_destroy( it->surface );
}
m_buffers.clear();
}
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