411 lines
14 KiB
C++
411 lines
14 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) 2012 Torsten Hueter, torstenhtr <at> gmx.de
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* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
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*
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* CairoGal - Graphics Abstraction Layer for Cairo
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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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#ifndef CAIROGAL_H_
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#define CAIROGAL_H_
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#include <map>
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#include <iterator>
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#include <cairo.h>
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#include <gal/graphics_abstraction_layer.h>
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#include <boost/smart_ptr/shared_ptr.hpp>
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#include <wx/dcbuffer.h>
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#if defined(__WXMSW__)
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#define SCREEN_DEPTH 24
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#else
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#if wxCHECK_VERSION( 2, 9, 0 )
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#define SCREEN_DEPTH wxBITMAP_SCREEN_DEPTH
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#else
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#define SCREEN_DEPTH 32
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#endif
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#endif
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/**
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* @brief Class CAIRO_GAL is the cairo implementation of the graphics abstraction layer.
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*
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* Quote from Wikipedia:
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* " Cairo is a software library used to provide a vector graphics-based, device-independent
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* API for software developers. It is designed to provide primitives for 2-dimensional
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* drawing across a number of different backends. "
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* <br>
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* Cairo offers also backends for Postscript and PDF surfaces. So it can be used for printing
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* of KiCad graphics surfaces as well.
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*
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*/
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namespace KIGFX
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{
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class CAIRO_COMPOSITOR;
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class CAIRO_GAL : public GAL, public wxWindow
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{
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public:
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/**
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* Constructor CAIRO_GAL
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*
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* @param aParent is the wxWidgets immediate wxWindow parent of this object.
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*
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* @param aMouseListener is the wxEvtHandler that should receive the mouse events,
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* this can be can be any wxWindow, but is often a wxFrame container.
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*
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* @param aPaintListener is the wxEvtHandler that should receive the paint
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* event. This can be any wxWindow, but is often a derived instance
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* of this class or a containing wxFrame. The "paint event" here is
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* a wxCommandEvent holding EVT_GAL_REDRAW, as sent by PostPaint().
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*
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* @param aName is the name of this window for use by wxWindow::FindWindowByName()
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*/
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CAIRO_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener = NULL,
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wxEvtHandler* aPaintListener = NULL, const wxString& aName = wxT( "CairoCanvas" ) );
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virtual ~CAIRO_GAL();
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///> @copydoc GAL::IsVisible()
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bool IsVisible() const override {
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return IsShownOnScreen();
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}
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// ---------------
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// Drawing methods
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// ---------------
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/// @copydoc GAL::BeginDrawing()
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virtual void BeginDrawing();
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/// @copydoc GAL::EndDrawing()
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virtual void EndDrawing();
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/// @copydoc GAL::DrawLine()
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virtual void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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/// @copydoc GAL::DrawSegment()
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virtual void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint, double aWidth );
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/// @copydoc GAL::DrawCircle()
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virtual void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius );
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/// @copydoc GAL::DrawArc()
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virtual void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
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double aStartAngle, double aEndAngle );
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/// @copydoc GAL::DrawRectangle()
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virtual void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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/// @copydoc GAL::DrawPolyline()
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virtual void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) { drawPoly( aPointList ); }
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virtual void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) { drawPoly( aPointList, aListSize ); }
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/// @copydoc GAL::DrawPolygon()
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virtual void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) { drawPoly( aPointList ); }
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virtual void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) { drawPoly( aPointList, aListSize ); }
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/// @copydoc GAL::DrawCurve()
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virtual void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
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const VECTOR2D& controlPointB, const VECTOR2D& endPoint );
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// --------------
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// Screen methods
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// --------------
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/// @brief Resizes the canvas.
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virtual void ResizeScreen( int aWidth, int aHeight );
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/// @brief Shows/hides the GAL canvas
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virtual bool Show( bool aShow );
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/// @copydoc GAL::Flush()
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virtual void Flush();
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/// @copydoc GAL::ClearScreen()
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virtual void ClearScreen( const COLOR4D& aColor );
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// -----------------
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// Attribute setting
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// -----------------
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/// @copydoc GAL::SetIsFill()
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virtual void SetIsFill( bool aIsFillEnabled );
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/// @copydoc GAL::SetIsStroke()
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virtual void SetIsStroke( bool aIsStrokeEnabled );
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/// @copydoc GAL::SetStrokeColor()
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virtual void SetStrokeColor( const COLOR4D& aColor );
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/// @copydoc GAL::SetFillColor()
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virtual void SetFillColor( const COLOR4D& aColor );
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/// @copydoc GAL::SetLineWidth()
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virtual void SetLineWidth( double aLineWidth );
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/// @copydoc GAL::SetLayerDepth()
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virtual void SetLayerDepth( double aLayerDepth );
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// --------------
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// Transformation
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// --------------
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/// @copydoc GAL::Transform()
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virtual void Transform( const MATRIX3x3D& aTransformation );
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/// @copydoc GAL::Rotate()
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virtual void Rotate( double aAngle );
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/// @copydoc GAL::Translate()
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virtual void Translate( const VECTOR2D& aTranslation );
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/// @copydoc GAL::Scale()
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virtual void Scale( const VECTOR2D& aScale );
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/// @copydoc GAL::Save()
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virtual void Save();
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/// @copydoc GAL::Restore()
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virtual void Restore();
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// --------------------------------------------
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// Group methods
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// ---------------------------------------------
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/// @copydoc GAL::BeginGroup()
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virtual int BeginGroup();
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/// @copydoc GAL::EndGroup()
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virtual void EndGroup();
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/// @copydoc GAL::DrawGroup()
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virtual void DrawGroup( int aGroupNumber );
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/// @copydoc GAL::ChangeGroupColor()
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virtual void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor );
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/// @copydoc GAL::ChangeGroupDepth()
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virtual void ChangeGroupDepth( int aGroupNumber, int aDepth );
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/// @copydoc GAL::DeleteGroup()
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virtual void DeleteGroup( int aGroupNumber );
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/// @copydoc GAL::ClearCache()
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virtual void ClearCache();
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// --------------------------------------------------------
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// Handling the world <-> screen transformation
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// --------------------------------------------------------
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/// @copydoc GAL::SaveScreen()
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virtual void SaveScreen();
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/// @copydoc GAL::RestoreScreen()
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virtual void RestoreScreen();
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/// @copydoc GAL::SetTarget()
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virtual void SetTarget( RENDER_TARGET aTarget );
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/// @copydoc GAL::GetTarget()
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virtual RENDER_TARGET GetTarget() const;
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/// @copydoc GAL::ClearTarget()
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virtual void ClearTarget( RENDER_TARGET aTarget );
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// -------
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// Cursor
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// -------
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/// @copydoc GAL::SetCursorSize()
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virtual void SetCursorSize( unsigned int aCursorSize );
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/// @copydoc GAL::DrawCursor()
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virtual void DrawCursor( const VECTOR2D& aCursorPosition );
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/**
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* Function PostPaint
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* posts an event to m_paint_listener. A post is used so that the actual drawing
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* function can use a device context type that is not specific to the wxEVT_PAINT event.
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*/
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void PostPaint()
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{
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if( paintListener )
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{
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wxPaintEvent redrawEvent;
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wxPostEvent( paintListener, redrawEvent );
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}
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}
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void SetMouseListener( wxEvtHandler* aMouseListener )
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{
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mouseListener = aMouseListener;
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}
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void SetPaintListener( wxEvtHandler* aPaintListener )
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{
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paintListener = aPaintListener;
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}
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protected:
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virtual void drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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private:
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/// Super class definition
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typedef GAL super;
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// Compositing variables
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boost::shared_ptr<CAIRO_COMPOSITOR> compositor; ///< Object for layers compositing
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unsigned int mainBuffer; ///< Handle to the main buffer
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unsigned int overlayBuffer; ///< Handle to the overlay buffer
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RENDER_TARGET currentTarget; ///< Current rendering target
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bool validCompositor; ///< Compositor initialization flag
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// Variables related to wxWidgets
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wxWindow* parentWindow; ///< Parent window
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wxEvtHandler* mouseListener; ///< Mouse listener
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wxEvtHandler* paintListener; ///< Paint listener
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unsigned int bufferSize; ///< Size of buffers cairoOutput, bitmapBuffers
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unsigned char* wxOutput; ///< wxImage comaptible buffer
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// Cursor variables
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std::deque<wxColour> savedCursorPixels; ///< Saved pixels of the cursor
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bool isDeleteSavedPixels; ///< True, if the saved pixels can be discarded
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wxPoint savedCursorPosition; ///< The last cursor position
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wxBitmap* cursorPixels; ///< Cursor pixels
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wxBitmap* cursorPixelsSaved; ///< Saved cursor pixels
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/// Maximum number of arguments for one command
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static const int MAX_CAIRO_ARGUMENTS = 6;
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/// Definitions for the command recorder
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enum GRAPHICS_COMMAND
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{
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CMD_SET_FILL, ///< Enable/disable filling
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CMD_SET_STROKE, ///< Enable/disable stroking
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CMD_SET_FILLCOLOR, ///< Set the fill color
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CMD_SET_STROKECOLOR, ///< Set the stroke color
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CMD_SET_LINE_WIDTH, ///< Set the line width
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CMD_STROKE_PATH, ///< Set the stroke path
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CMD_FILL_PATH, ///< Set the fill path
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CMD_TRANSFORM, ///< Transform the actual context
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CMD_ROTATE, ///< Rotate the context
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CMD_TRANSLATE, ///< Translate the context
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CMD_SCALE, ///< Scale the context
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CMD_SAVE, ///< Save the transformation matrix
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CMD_RESTORE, ///< Restore the transformation matrix
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CMD_CALL_GROUP ///< Call a group
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};
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/// Type definition for an graphics group element
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typedef struct
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{
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GRAPHICS_COMMAND command; ///< Command to execute
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double arguments[MAX_CAIRO_ARGUMENTS]; ///< Arguments for Cairo commands
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bool boolArgument; ///< A bool argument
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int intArgument; ///< An int argument
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cairo_path_t* cairoPath; ///< Pointer to a Cairo path
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} GROUP_ELEMENT;
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// Variables for the grouping function
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bool isGrouping; ///< Is grouping enabled ?
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bool isElementAdded; ///< Was an graphic element added ?
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typedef std::deque<GROUP_ELEMENT> GROUP; ///< A graphic group type definition
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std::map<int, GROUP> groups; ///< List of graphic groups
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unsigned int groupCounter; ///< Counter used for generating keys for groups
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GROUP* currentGroup; ///< Currently used group
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// Variables related to Cairo <-> wxWidgets
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cairo_matrix_t cairoWorldScreenMatrix; ///< Cairo world to screen transformation matrix
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cairo_t* currentContext; ///< Currently used Cairo context for drawing
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cairo_t* context; ///< Cairo image
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cairo_surface_t* surface; ///< Cairo surface
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unsigned int* bitmapBuffer; ///< Storage of the cairo image
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unsigned int* bitmapBufferBackup; ///< Backup storage of the cairo image
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int stride; ///< Stride value for Cairo
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bool isInitialized; ///< Are Cairo image & surface ready to use
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COLOR4D backgroundColor; ///< Background color
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// Methods
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void storePath(); ///< Store the actual path
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// Event handlers
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/**
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* @brief Paint event handler.
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*
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* @param aEvent is the paint event.
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*/
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void onPaint( wxPaintEvent& aEvent );
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/**
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* @brief Mouse event handler, forwards the event to the child.
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*
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* @param aEvent is the mouse event to be forwarded.
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*/
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void skipMouseEvent( wxMouseEvent& aEvent );
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/**
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* @brief Prepares cursor bitmap.
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*/
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virtual void initCursor();
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/**
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* @brief Blits cursor into the current screen.
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*/
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virtual void blitCursor( wxBufferedDC& clientDC );
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/// Prepare Cairo surfaces for drawing
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void initSurface();
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/// Destroy Cairo surfaces when are not needed anymore
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void deinitSurface();
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/// Allocate the bitmaps for drawing
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void allocateBitmaps();
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/// Allocate the bitmaps for drawing
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void deleteBitmaps();
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/// Prepare the compositor
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void setCompositor();
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/// Drawing polygons & polylines is the same in cairo, so here is the common code
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void drawPoly( const std::deque<VECTOR2D>& aPointList );
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void drawPoly( const VECTOR2D aPointList[], int aListSize );
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/**
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* @brief Returns a valid key that can be used as a new group number.
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*
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* @return An unique group number that is not used by any other group.
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*/
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unsigned int getNewGroupNumber();
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/// Format used to store pixels
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static const cairo_format_t GAL_FORMAT = CAIRO_FORMAT_RGB24;
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///> Opacity of a single layer
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static const float LAYER_ALPHA;
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};
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} // namespace KIGFX
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#endif // CAIROGAL_H_
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