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kicad/common/gal/cairo/cairo_gal.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
*
* CAIRO_GAL - Graphics Abstraction Layer for Cairo
*
* 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
*/
#include <wx/image.h>
#include <wx/log.h>
#include <gal/cairo/cairo_gal.h>
#include <gal/cairo/cairo_compositor.h>
#include <gal/definitions.h>
#include <limits>
using namespace KIGFX;
const float CAIRO_GAL::LAYER_ALPHA = 0.8;
CAIRO_GAL::CAIRO_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
wxEvtHandler* aPaintListener, const wxString& aName ) :
wxWindow( aParent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxEXPAND, aName )
{
parentWindow = aParent;
mouseListener = aMouseListener;
paintListener = aPaintListener;
// Initialize the flags
isGrouping = false;
isInitialized = false;
isDeleteSavedPixels = false;
validCompositor = false;
groupCounter = 0;
// Connecting the event handlers
Connect( wxEVT_PAINT, wxPaintEventHandler( CAIRO_GAL::onPaint ) );
// Mouse events are skipped to the parent
Connect( wxEVT_MOTION, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MOUSEWHEEL, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
#if defined _WIN32 || defined _WIN64
Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
#endif
SetSize( aParent->GetSize() );
screenSize = VECTOR2I( aParent->GetSize() );
cursorPixels = NULL;
cursorPixelsSaved = NULL;
initCursor();
// Grid color settings are different in Cairo and OpenGL
SetGridColor( COLOR4D( 0.1, 0.1, 0.1, 0.8 ) );
// Allocate memory for pixel storage
allocateBitmaps();
}
CAIRO_GAL::~CAIRO_GAL()
{
deinitSurface();
deleteBitmaps();
delete cursorPixels;
delete cursorPixelsSaved;
ClearCache();
}
void CAIRO_GAL::BeginDrawing()
{
initSurface();
if( !validCompositor )
setCompositor();
compositor->SetMainContext( context );
compositor->SetBuffer( mainBuffer );
// Cairo grouping prevents display of overlapping items on the same layer in the lighter color
cairo_push_group( currentContext );
}
void CAIRO_GAL::EndDrawing()
{
// Force remaining objects to be drawn
Flush();
// Cairo grouping prevents display of overlapping items on the same layer in the lighter color
cairo_pop_group_to_source( currentContext );
cairo_paint_with_alpha( currentContext, LAYER_ALPHA );
// Merge buffers on the screen
compositor->DrawBuffer( mainBuffer );
compositor->DrawBuffer( overlayBuffer );
// This code was taken from the wxCairo example - it's not the most efficient one
// Here is a good place for optimizations
// Now translate the raw context data from the format stored
// by cairo into a format understood by wxImage.
unsigned char* wxOutputPtr = wxOutput;
for( size_t count = 0; count < bufferSize; count++ )
{
unsigned int value = bitmapBuffer[count];
*wxOutputPtr++ = ( value >> 16 ) & 0xff; // Red pixel
*wxOutputPtr++ = ( value >> 8 ) & 0xff; // Green pixel
*wxOutputPtr++ = value & 0xff; // Blue pixel
}
wxImage img( screenSize.x, screenSize.y, (unsigned char*) wxOutput, true );
wxBitmap bmp( img );
wxClientDC client_dc( this );
wxBufferedDC dc;
dc.Init( &client_dc, bmp );
// Now it is the time to blit the mouse cursor
blitCursor( dc );
deinitSurface();
}
void CAIRO_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
cairo_move_to( currentContext, aStartPoint.x, aStartPoint.y );
cairo_line_to( currentContext, aEndPoint.x, aEndPoint.y );
isElementAdded = true;
}
void CAIRO_GAL::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth )
{
if( isFillEnabled )
{
// Filled tracks mode
SetLineWidth( aWidth );
cairo_move_to( currentContext, (double) aStartPoint.x, (double) aStartPoint.y );
cairo_line_to( currentContext, (double) aEndPoint.x, (double) aEndPoint.y );
}
else
{
// Outline mode for tracks
VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineAngle = atan2( startEndVector.y, startEndVector.x );
double lineLength = startEndVector.EuclideanNorm();
cairo_save( currentContext );
cairo_translate( currentContext, aStartPoint.x, aStartPoint.y );
cairo_rotate( currentContext, lineAngle );
cairo_arc( currentContext, 0.0, 0.0, aWidth / 2.0, M_PI / 2.0, 3.0 * M_PI / 2.0 );
cairo_arc( currentContext, lineLength, 0.0, aWidth / 2.0, -M_PI / 2.0, M_PI / 2.0 );
cairo_move_to( currentContext, 0.0, aWidth / 2.0 );
cairo_line_to( currentContext, lineLength, aWidth / 2.0 );
cairo_move_to( currentContext, 0.0, -aWidth / 2.0 );
cairo_line_to( currentContext, lineLength, -aWidth / 2.0 );
cairo_restore( currentContext );
}
isElementAdded = true;
}
void CAIRO_GAL::DrawCircle( const VECTOR2D& aCenterPoint, double aRadius )
{
// A circle is drawn using an arc
cairo_new_sub_path( currentContext );
cairo_arc( currentContext, aCenterPoint.x, aCenterPoint.y, aRadius, 0.0, 2 * M_PI );
isElementAdded = true;
}
void CAIRO_GAL::DrawArc( const VECTOR2D& aCenterPoint, double aRadius, double aStartAngle,
double aEndAngle )
{
SWAP( aStartAngle, >, aEndAngle );
cairo_new_sub_path( currentContext );
cairo_arc( currentContext, aCenterPoint.x, aCenterPoint.y, aRadius, aStartAngle, aEndAngle );
if( isFillEnabled )
{
VECTOR2D startPoint( cos( aStartAngle ) * aRadius + aCenterPoint.x,
sin( aStartAngle ) * aRadius + aCenterPoint.y );
VECTOR2D endPoint( cos( aEndAngle ) * aRadius + aCenterPoint.x,
sin( aEndAngle ) * aRadius + aCenterPoint.y );
cairo_move_to( currentContext, aCenterPoint.x, aCenterPoint.y );
cairo_line_to( currentContext, startPoint.x, startPoint.y );
cairo_line_to( currentContext, endPoint.x, endPoint.y );
cairo_close_path( currentContext );
}
isElementAdded = true;
}
void CAIRO_GAL::DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
// Calculate the diagonal points
VECTOR2D diagonalPointA( aEndPoint.x, aStartPoint.y );
VECTOR2D diagonalPointB( aStartPoint.x, aEndPoint.y );
// The path is composed from 4 segments
cairo_move_to( currentContext, aStartPoint.x, aStartPoint.y );
cairo_line_to( currentContext, diagonalPointA.x, diagonalPointA.y );
cairo_line_to( currentContext, aEndPoint.x, aEndPoint.y );
cairo_line_to( currentContext, diagonalPointB.x, diagonalPointB.y );
cairo_close_path( currentContext );
isElementAdded = true;
}
void CAIRO_GAL::DrawCurve( const VECTOR2D& aStartPoint, const VECTOR2D& aControlPointA,
const VECTOR2D& aControlPointB, const VECTOR2D& aEndPoint )
{
cairo_move_to( currentContext, aStartPoint.x, aStartPoint.y );
cairo_curve_to( currentContext, aControlPointA.x, aControlPointA.y, aControlPointB.x,
aControlPointB.y, aEndPoint.x, aEndPoint.y );
cairo_line_to( currentContext, aEndPoint.x, aEndPoint.y );
isElementAdded = true;
}
void CAIRO_GAL::ResizeScreen( int aWidth, int aHeight )
{
screenSize = VECTOR2I( aWidth, aHeight );
// Recreate the bitmaps
deleteBitmaps();
allocateBitmaps();
if( validCompositor )
compositor->Resize( aWidth, aHeight );
validCompositor = false;
SetSize( wxSize( aWidth, aHeight ) );
}
bool CAIRO_GAL::Show( bool aShow )
{
bool s = wxWindow::Show( aShow );
if( aShow )
wxWindow::Raise();
return s;
}
void CAIRO_GAL::Flush()
{
storePath();
}
void CAIRO_GAL::ClearScreen( const COLOR4D& aColor )
{
backgroundColor = aColor;
cairo_set_source_rgb( currentContext, aColor.r, aColor.g, aColor.b );
cairo_rectangle( currentContext, 0.0, 0.0, screenSize.x, screenSize.y );
cairo_fill( currentContext );
}
void CAIRO_GAL::SetIsFill( bool aIsFillEnabled )
{
storePath();
isFillEnabled = aIsFillEnabled;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_FILL;
groupElement.boolArgument = aIsFillEnabled;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL::SetIsStroke( bool aIsStrokeEnabled )
{
storePath();
isStrokeEnabled = aIsStrokeEnabled;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_STROKE;
groupElement.boolArgument = aIsStrokeEnabled;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL::SetStrokeColor( const COLOR4D& aColor )
{
storePath();
strokeColor = aColor;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_STROKECOLOR;
groupElement.arguments[0] = strokeColor.r;
groupElement.arguments[1] = strokeColor.g;
groupElement.arguments[2] = strokeColor.b;
groupElement.arguments[3] = strokeColor.a;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL::SetFillColor( const COLOR4D& aColor )
{
storePath();
fillColor = aColor;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_FILLCOLOR;
groupElement.arguments[0] = fillColor.r;
groupElement.arguments[1] = fillColor.g;
groupElement.arguments[2] = fillColor.b;
groupElement.arguments[3] = fillColor.a;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL::SetLineWidth( double aLineWidth )
{
storePath();
lineWidth = aLineWidth;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_LINE_WIDTH;
groupElement.arguments[0] = aLineWidth;
currentGroup->push_back( groupElement );
}
else
{
// Make lines appear at least 1 pixel wide, no matter of zoom
double x = 1.0, y = 1.0;
cairo_device_to_user_distance( currentContext, &x, &y );
double minWidth = std::min( fabs( x ), fabs( y ) );
cairo_set_line_width( currentContext, std::max( aLineWidth, minWidth ) );
}
}
void CAIRO_GAL::SetLayerDepth( double aLayerDepth )
{
super::SetLayerDepth( aLayerDepth );
if( isInitialized )
{
storePath();
cairo_pop_group_to_source( currentContext );
cairo_paint_with_alpha( currentContext, LAYER_ALPHA );
cairo_push_group( currentContext );
}
}
void CAIRO_GAL::Transform( const MATRIX3x3D& aTransformation )
{
cairo_matrix_t cairoTransformation;
cairo_matrix_init( &cairoTransformation,
aTransformation.m_data[0][0],
aTransformation.m_data[1][0],
aTransformation.m_data[0][1],
aTransformation.m_data[1][1],
aTransformation.m_data[0][2],
aTransformation.m_data[1][2] );
cairo_transform( currentContext, &cairoTransformation );
}
void CAIRO_GAL::Rotate( double aAngle )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_ROTATE;
groupElement.arguments[0] = aAngle;
currentGroup->push_back( groupElement );
}
else
{
cairo_rotate( currentContext, aAngle );
}
}
void CAIRO_GAL::Translate( const VECTOR2D& aTranslation )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_TRANSLATE;
groupElement.arguments[0] = aTranslation.x;
groupElement.arguments[1] = aTranslation.y;
currentGroup->push_back( groupElement );
}
else
{
cairo_translate( currentContext, aTranslation.x, aTranslation.y );
}
}
void CAIRO_GAL::Scale( const VECTOR2D& aScale )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SCALE;
groupElement.arguments[0] = aScale.x;
groupElement.arguments[1] = aScale.y;
currentGroup->push_back( groupElement );
}
else
{
cairo_scale( currentContext, aScale.x, aScale.y );
}
}
void CAIRO_GAL::Save()
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SAVE;
currentGroup->push_back( groupElement );
}
else
{
cairo_save( currentContext );
}
}
void CAIRO_GAL::Restore()
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_RESTORE;
currentGroup->push_back( groupElement );
}
else
{
cairo_restore( currentContext );
}
}
int CAIRO_GAL::BeginGroup()
{
initSurface();
// If the grouping is started: the actual path is stored in the group, when
// a attribute was changed or when grouping stops with the end group method.
storePath();
GROUP group;
int groupNumber = getNewGroupNumber();
groups.insert( std::make_pair( groupNumber, group ) );
currentGroup = &groups[groupNumber];
isGrouping = true;
return groupNumber;
}
void CAIRO_GAL::EndGroup()
{
storePath();
isGrouping = false;
deinitSurface();
}
void CAIRO_GAL::DrawGroup( int aGroupNumber )
{
// This method implements a small Virtual Machine - all stored commands
// are executed; nested calling is also possible
storePath();
for( GROUP::iterator it = groups[aGroupNumber].begin();
it != groups[aGroupNumber].end(); ++it )
{
switch( it->command )
{
case CMD_SET_FILL:
isFillEnabled = it->boolArgument;
break;
case CMD_SET_STROKE:
isStrokeEnabled = it->boolArgument;
break;
case CMD_SET_FILLCOLOR:
fillColor = COLOR4D( it->arguments[0], it->arguments[1], it->arguments[2],
it->arguments[3] );
break;
case CMD_SET_STROKECOLOR:
strokeColor = COLOR4D( it->arguments[0], it->arguments[1], it->arguments[2],
it->arguments[3] );
break;
case CMD_SET_LINE_WIDTH:
{
// Make lines appear at least 1 pixel wide, no matter of zoom
double x = 1.0, y = 1.0;
cairo_device_to_user_distance( currentContext, &x, &y );
double minWidth = std::min( fabs( x ), fabs( y ) );
cairo_set_line_width( currentContext, std::max( it->arguments[0], minWidth ) );
}
break;
case CMD_STROKE_PATH:
cairo_set_source_rgb( currentContext, strokeColor.r, strokeColor.g, strokeColor.b );
cairo_append_path( currentContext, it->cairoPath );
cairo_stroke( currentContext );
break;
case CMD_FILL_PATH:
cairo_set_source_rgb( currentContext, fillColor.r, fillColor.g, fillColor.b );
cairo_append_path( currentContext, it->cairoPath );
cairo_fill( currentContext );
break;
case CMD_TRANSFORM:
cairo_matrix_t matrix;
cairo_matrix_init( &matrix, it->arguments[0], it->arguments[1], it->arguments[2],
it->arguments[3], it->arguments[4], it->arguments[5] );
cairo_transform( currentContext, &matrix );
break;
case CMD_ROTATE:
cairo_rotate( currentContext, it->arguments[0] );
break;
case CMD_TRANSLATE:
cairo_translate( currentContext, it->arguments[0], it->arguments[1] );
break;
case CMD_SCALE:
cairo_scale( currentContext, it->arguments[0], it->arguments[1] );
break;
case CMD_SAVE:
cairo_save( currentContext );
break;
case CMD_RESTORE:
cairo_restore( currentContext );
break;
case CMD_CALL_GROUP:
DrawGroup( it->intArgument );
break;
}
}
}
void CAIRO_GAL::ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor )
{
storePath();
for( GROUP::iterator it = groups[aGroupNumber].begin();
it != groups[aGroupNumber].end(); ++it )
{
if( it->command == CMD_SET_FILLCOLOR || it->command == CMD_SET_STROKECOLOR )
{
it->arguments[0] = aNewColor.r;
it->arguments[1] = aNewColor.g;
it->arguments[2] = aNewColor.b;
it->arguments[3] = aNewColor.a;
}
}
}
void CAIRO_GAL::ChangeGroupDepth( int aGroupNumber, int aDepth )
{
// Cairo does not have any possibilities to change the depth coordinate of stored items,
// it depends only on the order of drawing
}
void CAIRO_GAL::DeleteGroup( int aGroupNumber )
{
storePath();
// Delete the Cairo paths
std::deque<GROUP_ELEMENT>::iterator it, end;
for( it = groups[aGroupNumber].begin(), end = groups[aGroupNumber].end(); it != end; ++it )
{
if( it->command == CMD_FILL_PATH || it->command == CMD_STROKE_PATH )
{
cairo_path_destroy( it->cairoPath );
}
}
// Delete the group
groups.erase( aGroupNumber );
}
void CAIRO_GAL::ClearCache()
{
for( int i = groups.size() - 1; i >= 0; --i )
{
DeleteGroup( i );
}
}
void CAIRO_GAL::SaveScreen()
{
// Copy the current bitmap to the backup buffer
int offset = 0;
for( int j = 0; j < screenSize.y; j++ )
{
for( int i = 0; i < stride; i++ )
{
bitmapBufferBackup[offset + i] = bitmapBuffer[offset + i];
offset += stride;
}
}
}
void CAIRO_GAL::RestoreScreen()
{
int offset = 0;
for( int j = 0; j < screenSize.y; j++ )
{
for( int i = 0; i < stride; i++ )
{
bitmapBuffer[offset + i] = bitmapBufferBackup[offset + i];
offset += stride;
}
}
}
void CAIRO_GAL::SetTarget( RENDER_TARGET aTarget )
{
// If the compositor is not set, that means that there is a recaching process going on
// and we do not need the compositor now
if( !validCompositor )
return;
// Cairo grouping prevents display of overlapping items on the same layer in the lighter color
if( isInitialized )
{
storePath();
cairo_pop_group_to_source( currentContext );
cairo_paint_with_alpha( currentContext, LAYER_ALPHA );
}
switch( aTarget )
{
default:
case TARGET_CACHED:
case TARGET_NONCACHED:
compositor->SetBuffer( mainBuffer );
break;
case TARGET_OVERLAY:
compositor->SetBuffer( overlayBuffer );
break;
}
if( isInitialized )
cairo_push_group( currentContext );
currentTarget = aTarget;
}
RENDER_TARGET CAIRO_GAL::GetTarget() const
{
return currentTarget;
}
void CAIRO_GAL::ClearTarget( RENDER_TARGET aTarget )
{
// Save the current state
unsigned int currentBuffer = compositor->GetBuffer();
switch( aTarget )
{
// Cached and noncached items are rendered to the same buffer
default:
case TARGET_CACHED:
case TARGET_NONCACHED:
compositor->SetBuffer( mainBuffer );
break;
case TARGET_OVERLAY:
compositor->SetBuffer( overlayBuffer );
break;
}
compositor->ClearBuffer();
// Restore the previous state
compositor->SetBuffer( currentBuffer );
}
void CAIRO_GAL::SetCursorSize( unsigned int aCursorSize )
{
GAL::SetCursorSize( aCursorSize );
initCursor();
}
void CAIRO_GAL::DrawCursor( const VECTOR2D& aCursorPosition )
{
// Now we should only store the position of the mouse cursor
// The real drawing routines are in blitCursor()
cursorPosition = VECTOR2D( aCursorPosition.x - cursorSize / 2,
aCursorPosition.y - cursorSize / 2 );
}
void CAIRO_GAL::drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
cairo_move_to( currentContext, aStartPoint.x, aStartPoint.y );
cairo_line_to( currentContext, aEndPoint.x, aEndPoint.y );
cairo_set_source_rgb( currentContext, gridColor.r, gridColor.g, gridColor.b );
cairo_stroke( currentContext );
}
void CAIRO_GAL::storePath()
{
if( isElementAdded )
{
isElementAdded = false;
if( !isGrouping )
{
if( isFillEnabled )
{
cairo_set_source_rgb( currentContext, fillColor.r, fillColor.g, fillColor.b );
cairo_fill_preserve( currentContext );
}
if( isStrokeEnabled )
{
cairo_set_source_rgb( currentContext, strokeColor.r, strokeColor.g,
strokeColor.b );
cairo_stroke_preserve( currentContext );
}
}
else
{
// Copy the actual path, append it to the global path list
// then check, if the path needs to be stroked/filled and
// add this command to the group list;
if( isStrokeEnabled )
{
GROUP_ELEMENT groupElement;
groupElement.cairoPath = cairo_copy_path( currentContext );
groupElement.command = CMD_STROKE_PATH;
currentGroup->push_back( groupElement );
}
if( isFillEnabled )
{
GROUP_ELEMENT groupElement;
groupElement.cairoPath = cairo_copy_path( currentContext );
groupElement.command = CMD_FILL_PATH;
currentGroup->push_back( groupElement );
}
}
cairo_new_path( currentContext );
}
}
void CAIRO_GAL::onPaint( wxPaintEvent& WXUNUSED( aEvent ) )
{
PostPaint();
}
void CAIRO_GAL::skipMouseEvent( wxMouseEvent& aEvent )
{
// Post the mouse event to the event listener registered in constructor, if any
if( mouseListener )
wxPostEvent( mouseListener, aEvent );
}
void CAIRO_GAL::initCursor()
{
if( cursorPixels )
delete cursorPixels;
if( cursorPixelsSaved )
delete cursorPixelsSaved;
cursorPixels = new wxBitmap( cursorSize, cursorSize );
cursorPixelsSaved = new wxBitmap( cursorSize, cursorSize );
wxMemoryDC cursorShape( *cursorPixels );
cursorShape.SetBackground( *wxTRANSPARENT_BRUSH );
wxColour color( cursorColor.r * cursorColor.a * 255, cursorColor.g * cursorColor.a * 255,
cursorColor.b * cursorColor.a * 255, 255 );
wxPen pen = wxPen( color );
cursorShape.SetPen( pen );
cursorShape.Clear();
cursorShape.DrawLine( 0, cursorSize / 2, cursorSize, cursorSize / 2 );
cursorShape.DrawLine( cursorSize / 2, 0, cursorSize / 2, cursorSize );
}
void CAIRO_GAL::blitCursor( wxBufferedDC& clientDC )
{
if( !isCursorEnabled )
return;
wxMemoryDC cursorSave( *cursorPixelsSaved );
wxMemoryDC cursorShape( *cursorPixels );
if( !isDeleteSavedPixels )
{
// Restore pixels that were overpainted by the previous cursor
clientDC.Blit( savedCursorPosition.x, savedCursorPosition.y,
cursorSize, cursorSize, &cursorSave, 0, 0 );
}
else
{
isDeleteSavedPixels = false;
}
// Store pixels that are going to be overpainted
VECTOR2D cursorScreen = ToScreen( cursorPosition ) - cursorSize / 2.0f;
cursorSave.Blit( 0, 0, cursorSize, cursorSize, &clientDC, cursorScreen.x, cursorScreen.y );
// Draw the cursor
clientDC.Blit( cursorScreen.x, cursorScreen.y, cursorSize, cursorSize,
&cursorShape, 0, 0, wxOR );
savedCursorPosition.x = (wxCoord) cursorScreen.x;
savedCursorPosition.y = (wxCoord) cursorScreen.y;
}
void CAIRO_GAL::allocateBitmaps()
{
// Create buffer, use the system independent Cairo context backend
stride = cairo_format_stride_for_width( GAL_FORMAT, screenSize.x );
bufferSize = stride * screenSize.y;
bitmapBuffer = new unsigned int[bufferSize];
bitmapBufferBackup = new unsigned int[bufferSize];
wxOutput = new unsigned char[bufferSize * 3];
}
void CAIRO_GAL::deleteBitmaps()
{
delete[] bitmapBuffer;
delete[] bitmapBufferBackup;
delete[] wxOutput;
}
void CAIRO_GAL::initSurface()
{
if( isInitialized )
return;
// Create the Cairo surface
surface = cairo_image_surface_create_for_data( (unsigned char*) bitmapBuffer, GAL_FORMAT,
screenSize.x, screenSize.y, stride );
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__ */
currentContext = context;
cairo_set_antialias( context, CAIRO_ANTIALIAS_SUBPIXEL );
// Clear the screen
ClearScreen( backgroundColor );
// Compute the world <-> screen transformations
ComputeWorldScreenMatrix();
cairo_matrix_init( &cairoWorldScreenMatrix, worldScreenMatrix.m_data[0][0],
worldScreenMatrix.m_data[1][0], worldScreenMatrix.m_data[0][1],
worldScreenMatrix.m_data[1][1], worldScreenMatrix.m_data[0][2],
worldScreenMatrix.m_data[1][2] );
cairo_set_matrix( context, &cairoWorldScreenMatrix );
// Start drawing with a new path
cairo_new_path( context );
isElementAdded = true;
cairo_set_line_join( context, CAIRO_LINE_JOIN_ROUND );
cairo_set_line_cap( context, CAIRO_LINE_CAP_ROUND );
lineWidth = 0;
isDeleteSavedPixels = true;
isInitialized = true;
}
void CAIRO_GAL::deinitSurface()
{
if( !isInitialized )
return;
// Destroy Cairo objects
cairo_destroy( context );
cairo_surface_destroy( surface );
isInitialized = false;
}
void CAIRO_GAL::setCompositor()
{
// Recreate the compositor with the new Cairo context
compositor.reset( new CAIRO_COMPOSITOR( &currentContext ) );
compositor->Resize( screenSize.x, screenSize.y );
// Prepare buffers
mainBuffer = compositor->CreateBuffer();
overlayBuffer = compositor->CreateBuffer();
validCompositor = true;
}
void CAIRO_GAL::drawPoly( const std::deque<VECTOR2D>& aPointList )
{
// Iterate over the point list and draw the segments
std::deque<VECTOR2D>::const_iterator it = aPointList.begin();
cairo_move_to( currentContext, it->x, it->y );
for( ++it; it != aPointList.end(); ++it )
{
cairo_line_to( currentContext, it->x, it->y );
}
isElementAdded = true;
}
void CAIRO_GAL::drawPoly( const VECTOR2D aPointList[], int aListSize )
{
// Iterate over the point list and draw the segments
const VECTOR2D* ptr = aPointList;
cairo_move_to( currentContext, ptr->x, ptr->y );
for( int i = 0; i < aListSize; ++i )
{
++ptr;
cairo_line_to( currentContext, ptr->x, ptr->y );
}
isElementAdded = true;
}
unsigned int CAIRO_GAL::getNewGroupNumber()
{
wxASSERT_MSG( groups.size() < std::numeric_limits<unsigned int>::max(),
wxT( "There are no free slots to store a group" ) );
while( groups.find( groupCounter ) != groups.end() )
{
groupCounter++;
}
return groupCounter++;
}
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