475 lines
17 KiB
C++
475 lines
17 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) 2012-2021 KiCad Developers, see AUTHORS.txt for contributors.
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* Copyright (C) 2017-2018 CERN
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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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 <wx/dcbuffer.h>
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#include <memory>
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/**
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* 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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*
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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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namespace KIGFX
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{
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class CAIRO_COMPOSITOR;
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class CAIRO_GAL_BASE : public GAL
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{
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public:
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CAIRO_GAL_BASE( GAL_DISPLAY_OPTIONS& aDisplayOptions );
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~CAIRO_GAL_BASE();
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bool IsCairoEngine() override { return true; }
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// ---------------
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// Drawing methods
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// ---------------
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/// @copydoc GAL::DrawLine()
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void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
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/// @copydoc GAL::DrawSegment()
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void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
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double aWidth ) override;
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/// @copydoc GAL::DrawCircle()
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void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius ) override;
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/// @copydoc GAL::DrawArc()
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void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
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double aStartAngle, double aEndAngle ) override;
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/// @copydoc GAL::DrawArcSegment()
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void DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius,
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double aStartAngle, double aEndAngle, double aWidth ) override;
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/// @copydoc GAL::DrawRectangle()
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void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
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/// @copydoc GAL::DrawPolyline()
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void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) override { drawPoly( aPointList ); }
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void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) override
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{
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drawPoly( aPointList, aListSize );
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}
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void DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain ) override { drawPoly( aLineChain ); }
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/// @copydoc GAL::DrawPolygon()
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void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) override { drawPoly( aPointList ); }
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void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) override
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{
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drawPoly( aPointList, aListSize );
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}
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void DrawPolygon( const SHAPE_POLY_SET& aPolySet ) override;
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void DrawPolygon( const SHAPE_LINE_CHAIN& aPolySet ) override;
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/// @copydoc GAL::DrawCurve()
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void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
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const VECTOR2D& controlPointB, const VECTOR2D& endPoint,
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double aFilterValue = 0.0 ) override;
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/// @copydoc GAL::DrawBitmap()
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void DrawBitmap( const BITMAP_BASE& aBitmap ) override;
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// --------------
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// Screen methods
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// --------------
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/// Resizes the canvas.
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void ResizeScreen( int aWidth, int aHeight ) override;
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/// @copydoc GAL::Flush()
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void Flush() override;
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/// @copydoc GAL::ClearScreen()
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void ClearScreen() override;
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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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void SetIsFill( bool aIsFillEnabled ) override;
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/// @copydoc GAL::SetIsStroke()
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void SetIsStroke( bool aIsStrokeEnabled ) override;
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/// @copydoc GAL::SetStrokeColor()
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void SetStrokeColor( const COLOR4D& aColor ) override;
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/// @copydoc GAL::SetFillColor()
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void SetFillColor( const COLOR4D& aColor ) override;
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/// @copydoc GAL::SetLineWidth()
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void SetLineWidth( float aLineWidth ) override;
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/// @copydoc GAL::SetLayerDepth()
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void SetLayerDepth( double aLayerDepth ) override;
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// --------------
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// Transformation
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// --------------
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/// @copydoc GAL::Transform()
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void Transform( const MATRIX3x3D& aTransformation ) override;
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/// @copydoc GAL::Rotate()
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void Rotate( double aAngle ) override;
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/// @copydoc GAL::Translate()
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void Translate( const VECTOR2D& aTranslation ) override;
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/// @copydoc GAL::Scale()
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void Scale( const VECTOR2D& aScale ) override;
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/// @copydoc GAL::Save()
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void Save() override;
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/// @copydoc GAL::Restore()
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void Restore() override;
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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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int BeginGroup() override;
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/// @copydoc GAL::EndGroup()
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void EndGroup() override;
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/// @copydoc GAL::DrawGroup()
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void DrawGroup( int aGroupNumber ) override;
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/// @copydoc GAL::ChangeGroupColor()
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void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor ) override;
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/// @copydoc GAL::ChangeGroupDepth()
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void ChangeGroupDepth( int aGroupNumber, int aDepth ) override;
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/// @copydoc GAL::DeleteGroup()
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void DeleteGroup( int aGroupNumber ) override;
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/// @copydoc GAL::ClearCache()
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void ClearCache() override;
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// --------------------------------------------------------
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// Handling the world <-> screen transformation
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// --------------------------------------------------------
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/// @copydoc GAL::SetNegativeDrawMode()
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void SetNegativeDrawMode( bool aSetting ) override;
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// -------
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// Cursor
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// -------
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/// @copydoc GAL::DrawCursor()
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void DrawCursor( const VECTOR2D& aCursorPosition ) override;
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void EnableDepthTest( bool aEnabled = false ) override;
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///< @copydoc GAL::DrawGrid()
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void DrawGrid() override;
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protected:
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// Geometric transforms according to the currentWorld2Screen transform matrix:
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const double xform( double x ); // scale
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const VECTOR2D xform( double x, double y ); // rotation, scale and offset
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const VECTOR2D xform( const VECTOR2D& aP ); // rotation, scale and offset
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/**
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* Transform according to the rotation from currentWorld2Screen transform matrix.
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*
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* @param aAngle is the angle in radians to transform.
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* @return the modified angle.
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*/
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const double angle_xform( const double aAngle );
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/**
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* Transform according to the rotation from currentWorld2Screen transform matrix
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* for the start angle and the end angle of an arc.
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*
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* @param aStartAngle is the arc starting point in radians to transform
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* @param aEndAngle is the arc ending point in radians to transform
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*/
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void arc_angles_xform_and_normalize( double& aStartAngle, double& aEndAngle );
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/// @copydoc GAL::BeginDrawing()
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void beginDrawing() override;
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/// @copydoc GAL::EndDrawing()
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void endDrawing() override;
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void resetContext();
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/**
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* Draw a grid line (usually a simplified line function).
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*
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* @param aStartPoint is the start point of the line.
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* @param aEndPoint is the end point of the line.
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*/
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void drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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void drawGridCross( const VECTOR2D& aPoint );
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void drawGridPoint( const VECTOR2D& aPoint, double aWidth, double aHeight );
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void drawAxes( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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void flushPath();
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void storePath(); ///< Store the actual path
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/**
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* Blit cursor into the current screen.
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*/
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void blitCursor( wxMemoryDC& clientDC );
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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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void drawPoly( const SHAPE_LINE_CHAIN& aLineChain );
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/**
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* Return 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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void syncLineWidth( bool aForceWidth = false, double aWidth = 0.0 );
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void updateWorldScreenMatrix();
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const VECTOR2D roundp( const VECTOR2D& v );
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/// Super class definition
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typedef GAL super;
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/// Maximum number of arguments for one command
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static const int MAX_CAIRO_ARGUMENTS = 4;
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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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union {
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double dblArg[MAX_CAIRO_ARGUMENTS]; ///< Arguments for Cairo commands
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bool boolArg; ///< A bool argument
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int intArg; ///< An int argument
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} 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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double linePixelWidth;
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double lineWidthInPixels;
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bool lineWidthIsOdd;
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cairo_matrix_t cairoWorldScreenMatrix; ///< Cairo world to screen transformation matrix
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cairo_matrix_t currentXform;
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cairo_matrix_t currentWorld2Screen;
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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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/// List of surfaces that were created by painting images, to be cleaned up later
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std::vector<cairo_surface_t*> imageSurfaces;
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std::vector<cairo_matrix_t> xformStack;
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/// Format used to store pixels
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static constexpr cairo_format_t GAL_FORMAT = CAIRO_FORMAT_ARGB32;
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};
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class CAIRO_GAL : public CAIRO_GAL_BASE, public wxWindow
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{
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public:
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/**
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* @param aParent is the wxWidgets immediate wxWindow parent of this object.
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* @param aMouseListener is the wxEvtHandler that should receive the mouse events, this
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* can be can be any wxWindow, but is often a wxFrame container.
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* @param aPaintListener is the wxEvtHandler that should receive the paint event. This
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* can be any wxWindow, but is often a derived instance of this
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* class or a containing wxFrame. The "paint event" here is a
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* 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( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
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wxEvtHandler* aMouseListener = nullptr, wxEvtHandler* aPaintListener = nullptr,
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const wxString& aName = wxT( "CairoCanvas" ) );
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~CAIRO_GAL();
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///< @copydoc GAL::IsVisible()
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bool IsVisible() const override
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{
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return IsShownOnScreen() && !GetClientRect().IsEmpty();
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}
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void ResizeScreen( int aWidth, int aHeight ) override;
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bool Show( bool aShow ) override;
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int BeginGroup() override;
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void EndGroup() override;
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void SetTarget( RENDER_TARGET aTarget ) override;
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RENDER_TARGET GetTarget() const override;
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void ClearTarget( RENDER_TARGET aTarget ) override;
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/**
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* Post an event to m_paint_listener.
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*
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* A post is used so that the actual drawing function can use a device context type that
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* is not specific to the wxEVT_PAINT event, just by changing the PostPaint code.
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*/
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void PostPaint( wxPaintEvent& aEvent );
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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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/// @copydoc GAL::BeginDrawing()
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void beginDrawing() override;
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/// @copydoc GAL::EndDrawing()
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void endDrawing() override;
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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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// Event handlers
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/**
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* 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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* 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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///< Cairo-specific update handlers
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bool updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions ) override;
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protected:
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// Compositor related variables
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std::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 compatible buffer
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// Variables related to Cairo <-> wxWidgets
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unsigned char* bitmapBuffer; ///< Storage of the Cairo image
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int stride; ///< Stride value for Cairo
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int wxBufferWidth;
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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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};
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} // namespace KIGFX
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#endif // CAIROGAL_H_
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