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