graphics_abstraction_layer.h

Go to the documentation of this file.

/*
 * 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) 2016-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * Graphics Abstraction Layer (GAL) - base class
 *
 * 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
 */

#ifndef GRAPHICSABSTRACTIONLAYER_H_
#define GRAPHICSABSTRACTIONLAYER_H_

#include <deque>
#include <stack>
#include <limits>

#include <math/matrix3x3.h>

#include <gal/color4d.h>
#include <gal/cursors.h>
#include <gal/definitions.h>
#include <gal/stroke_font.h>
#include <gal/gal_display_options.h>
#include <newstroke_font.h>

class SHAPE_LINE_CHAIN;
class SHAPE_POLY_SET;
class BITMAP_BASE;

namespace KIGFX
{

class GAL : GAL_DISPLAY_OPTIONS_OBSERVER
{
 // These friend declarations allow us to hide routines that should not be called. The
 // corresponding RAII objects must be used instead.
 friend class GAL_CONTEXT_LOCKER;
 friend class GAL_UPDATE_CONTEXT;
 friend class GAL_DRAWING_CONTEXT;

public:
 // Constructor / Destructor
 GAL( GAL_DISPLAY_OPTIONS& aOptions );
 virtual ~GAL();

 virtual bool IsInitialized() const { return true; }

 virtual bool IsVisible() const { return true; }

 virtual bool IsCairoEngine() { return false; }

 virtual bool IsOpenGlEngine() { return false; }

 // ---------------
 // Drawing methods
 // ---------------

 virtual void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) {};

 virtual void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
 double aWidth ) {};

 virtual void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) {};
 virtual void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) {};
 virtual void DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain ) {};

 virtual void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius ) {};

 virtual void DrawArc( const VECTOR2D& aCenterPoint, double aRadius, double aStartAngle,
 double aEndAngle ) {};

 virtual void DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius, double aStartAngle,
 double aEndAngle, double aWidth, double aMaxError ) {};

 virtual void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) {};

 virtual void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) {};
 virtual void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) {};
 virtual void DrawPolygon( const SHAPE_POLY_SET& aPolySet, bool aStrokeTriangulation = false ) {};
 virtual void DrawPolygon( const SHAPE_LINE_CHAIN& aPolySet ) {};

 virtual void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
 const VECTOR2D& controlPointB, const VECTOR2D& endPoint,
 double aFilterValue = 0.0 ) {};

 virtual void DrawBitmap( const BITMAP_BASE& aBitmap ) {};

 // --------------
 // Screen methods
 // --------------

 virtual void ResizeScreen( int aWidth, int aHeight ) {};

 virtual bool Show( bool aShow ) { return true; };

 const VECTOR2I& GetScreenPixelSize() const
 {
 return m_screenSize;
 }

 virtual void Flush() {};

 void SetClearColor( const COLOR4D& aColor )
 {
 m_clearColor = aColor;
 }

 const COLOR4D& GetClearColor( ) const
 {
 return m_clearColor;
 }

 virtual void ClearScreen() {};

 // -----------------
 // Attribute setting
 // -----------------

 virtual void SetIsFill( bool aIsFillEnabled )
 {
 m_isFillEnabled = aIsFillEnabled;
 }

 virtual void SetIsStroke( bool aIsStrokeEnabled )
 {
 m_isStrokeEnabled = aIsStrokeEnabled;
 }

 virtual void SetFillColor( const COLOR4D& aColor )
 {
 m_fillColor = aColor;
 }

 inline const COLOR4D& GetFillColor() const
 {
 return m_fillColor;
 }

 virtual void SetStrokeColor( const COLOR4D& aColor )
 {
 m_strokeColor = aColor;
 }

 inline const COLOR4D& GetStrokeColor() const
 {
 return m_strokeColor;
 }

 virtual void SetLineWidth( float aLineWidth )
 {
 m_lineWidth = aLineWidth;
 }

 inline float GetLineWidth() const
 {
 return m_lineWidth;
 }

 virtual void SetLayerDepth( double aLayerDepth )
 {
 assert( aLayerDepth <= m_depthRange.y );
 assert( aLayerDepth >= m_depthRange.x );

 m_layerDepth = aLayerDepth;
 }

 // ----
 // Text
 // ----

 const STROKE_FONT& GetStrokeFont() const
 {
 return m_strokeFont;
 }

 virtual void StrokeText( const wxString& aText, const VECTOR2D& aPosition,
 double aRotationAngle )
 {
 m_strokeFont.Draw( aText, aPosition, aRotationAngle );
 }

 virtual void BitmapText( const wxString& aText, const VECTOR2D& aPosition,
 double aRotationAngle )
 {
 // Fallback: use stroke font

 // Handle flipped view
 if( m_globalFlipX )
 textProperties.m_mirrored = !textProperties.m_mirrored;

 // Bitmap font is slightly smaller and slightly heavier than the stroke font so we
 // compensate a bit before stroking
 float saveLineWidth = m_lineWidth;
 VECTOR2D saveGlyphSize = textProperties.m_glyphSize;
 {
 m_lineWidth *= 1.2f;
 textProperties.m_glyphSize = textProperties.m_glyphSize * 0.8;

 StrokeText( aText, aPosition, aRotationAngle );
 }
 m_lineWidth = saveLineWidth;
 textProperties.m_glyphSize = saveGlyphSize;

 if( m_globalFlipX )
 textProperties.m_mirrored = !textProperties.m_mirrored;
 }

 VECTOR2D GetTextLineSize( const UTF8& aText ) const;

 virtual void SetTextAttributes( const EDA_TEXT* aText );

 void ResetTextAttributes();

 inline void SetGlyphSize( const VECTOR2D& aSize ) { textProperties.m_glyphSize = aSize; }
 const VECTOR2D& GetGlyphSize() const { return textProperties.m_glyphSize; }

 inline void SetFontBold( bool aBold ) { textProperties.m_bold = aBold; }
 inline bool IsFontBold() const { return textProperties.m_bold; }

 inline void SetFontItalic( bool aItalic ) { textProperties.m_italic = aItalic; }
 inline bool IsFontItalic() const { return textProperties.m_italic; }

 inline void SetFontUnderlined( bool aUnderlined ) { textProperties.m_underlined = aUnderlined; }
 inline bool IsFontUnderlined() const { return textProperties.m_underlined; }

 inline void SetTextMirrored( bool aMirrored ) { textProperties.m_mirrored = aMirrored; }
 inline bool IsTextMirrored() const { return textProperties.m_mirrored; }

 inline void SetHorizontalJustify( const EDA_TEXT_HJUSTIFY_T aHorizontalJustify )
 {
 textProperties.m_horizontalJustify = aHorizontalJustify;
 }

 inline EDA_TEXT_HJUSTIFY_T GetHorizontalJustify() const
 {
 return textProperties.m_horizontalJustify;
 }

 inline void SetVerticalJustify( const EDA_TEXT_VJUSTIFY_T aVerticalJustify )
 {
 textProperties.m_verticalJustify = aVerticalJustify;
 }

 inline EDA_TEXT_VJUSTIFY_T GetVerticalJustify() const
 {
 return textProperties.m_verticalJustify;
 }


 // --------------
 // Transformation
 // --------------

 virtual void Transform( const MATRIX3x3D& aTransformation ) {};

 virtual void Rotate( double aAngle ) {};

 virtual void Translate( const VECTOR2D& aTranslation ) {};

 virtual void Scale( const VECTOR2D& aScale ) {};

 virtual void Save() {};

 virtual void Restore() {};

 // --------------------------------------------
 // Group methods
 // ---------------------------------------------

 virtual int BeginGroup() { return 0; };

 virtual void EndGroup() {};

 virtual void DrawGroup( int aGroupNumber ) {};

 virtual void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor ) {};

 virtual void ChangeGroupDepth( int aGroupNumber, int aDepth ) {};

 virtual void DeleteGroup( int aGroupNumber ) {};

 virtual void ClearCache() {};

 // --------------------------------------------------------
 // Handling the world <-> screen transformation
 // --------------------------------------------------------

 virtual void ComputeWorldScreenMatrix();

 const MATRIX3x3D& GetWorldScreenMatrix() const
 {
 return m_worldScreenMatrix;
 }

 const MATRIX3x3D& GetScreenWorldMatrix() const
 {
 return m_screenWorldMatrix;
 }

 inline void SetWorldScreenMatrix( const MATRIX3x3D& aMatrix )
 {
 m_worldScreenMatrix = aMatrix;
 }

 BOX2D GetVisibleWorldExtents() const;

 inline void SetWorldUnitLength( double aWorldUnitLength )
 {
 m_worldUnitLength = aWorldUnitLength;
 }

 inline void SetScreenSize( const VECTOR2I& aSize )
 {
 m_screenSize = aSize;
 }

 inline void SetScreenDPI( double aScreenDPI )
 {
 m_screenDPI = aScreenDPI;
 }

 inline void SetLookAtPoint( const VECTOR2D& aPoint )
 {
 m_lookAtPoint = aPoint;
 }

 inline const VECTOR2D& GetLookAtPoint() const
 {
 return m_lookAtPoint;
 }

 inline void SetZoomFactor( double aZoomFactor )
 {
 m_zoomFactor = aZoomFactor;
 }

 inline double GetZoomFactor() const
 {
 return m_zoomFactor;
 }

 void SetRotation( double aRotation )
 {
 m_rotation = aRotation;
 }

 double GetRotation() const
 {
 return m_rotation;
 }

 inline void SetDepthRange( const VECTOR2D& aDepthRange )
 {
 m_depthRange = aDepthRange;
 }

 inline double GetMinDepth() const
 {
 return m_depthRange.x;
 }

 inline double GetMaxDepth() const
 {
 return m_depthRange.y;
 }

 inline double GetWorldScale() const
 {
 return m_worldScale;
 }

 inline void SetFlip( bool xAxis, bool yAxis )
 {
 m_globalFlipX = xAxis;
 m_globalFlipY = yAxis;
 }

 bool IsFlippedX() const
 {
 return m_globalFlipX;
 }

 bool IsFlippedY() const
 {
 return m_globalFlipY;
 }

 // ---------------------------
 // Buffer manipulation methods
 // ---------------------------

 virtual void SetTarget( RENDER_TARGET aTarget ) {};

 virtual RENDER_TARGET GetTarget() const { return TARGET_CACHED; };

 virtual void ClearTarget( RENDER_TARGET aTarget ) {};

 virtual bool HasTarget( RENDER_TARGET aTarget )
 {
 return true;
 };

 virtual void SetNegativeDrawMode( bool aSetting ) {};

 virtual void StartDiffLayer() {};

 virtual void EndDiffLayer() {};

 virtual void StartNegativesLayer(){};

 virtual void EndNegativesLayer(){};

 // -------------
 // Grid methods
 // -------------

 void SetGridVisibility( bool aVisibility ) { m_gridVisibility = aVisibility; }

 bool GetGridVisibility() const { return m_gridVisibility; }

 bool GetGridSnapping() const
 {
 return m_options.m_gridSnapping == KIGFX::GRID_SNAPPING::ALWAYS ||
 ( m_gridVisibility && m_options.m_gridSnapping == KIGFX::GRID_SNAPPING::WITH_GRID );
 }

 inline void SetGridOrigin( const VECTOR2D& aGridOrigin )
 {
 m_gridOrigin = aGridOrigin;

 if( m_gridSize.x == 0.0 || m_gridSize.y == 0.0 )
 {
 m_gridOffset = VECTOR2D( 0.0, 0.0);
 }
 else
 {
 m_gridOffset = VECTOR2D( (long) m_gridOrigin.x % (long) m_gridSize.x,
 (long) m_gridOrigin.y % (long) m_gridSize.y );
 }
 }

 inline const VECTOR2D& GetGridOrigin() const
 {
 return m_gridOrigin;
 }

 inline void SetGridSize( const VECTOR2D& aGridSize )
 {
 m_gridSize = aGridSize;

 // Avoid stupid grid size values: a grid size should be >= 1 in internal units
 m_gridSize.x = std::max( 1.0, m_gridSize.x );
 m_gridSize.y = std::max( 1.0, m_gridSize.y );

 m_gridOffset = VECTOR2D( (long) m_gridOrigin.x % (long) m_gridSize.x,
 (long) m_gridOrigin.y % (long) m_gridSize.y );
 }

 inline const VECTOR2D& GetGridSize() const
 {
 return m_gridSize;
 }

 inline void SetGridColor( const COLOR4D& aGridColor )
 {
 m_gridColor = aGridColor;
 }

 inline void SetAxesColor( const COLOR4D& aAxesColor )
 {
 m_axesColor = aAxesColor;
 }

 inline void SetAxesEnabled( bool aAxesEnabled )
 {
 m_axesEnabled = aAxesEnabled;
 }

 inline void SetCoarseGrid( int aInterval )
 {
 m_gridTick = aInterval;
 }

 inline float GetGridLineWidth() const
 {
 return m_gridLineWidth;
 }

 virtual void DrawGrid() {};

 VECTOR2D GetGridPoint( const VECTOR2D& aPoint ) const;

 inline VECTOR2D ToWorld( const VECTOR2D& aPoint ) const
 {
 return VECTOR2D( m_screenWorldMatrix * aPoint );
 }

 inline VECTOR2D ToScreen( const VECTOR2D& aPoint ) const
 {
 return VECTOR2D( m_worldScreenMatrix * aPoint );
 }

 virtual bool SetNativeCursorStyle( KICURSOR aCursor );

 inline void SetCursorEnabled( bool aCursorEnabled )
 {
 m_isCursorEnabled = aCursorEnabled;
 }

 bool IsCursorEnabled() const
 {
 return m_isCursorEnabled || m_forceDisplayCursor;
 }

 inline void SetCursorColor( const COLOR4D& aCursorColor )
 {
 m_cursorColor = aCursorColor;
 }

 virtual void DrawCursor( const VECTOR2D& aCursorPosition ) {};

 inline void AdvanceDepth()
 {
 m_layerDepth -= 0.05;
 }

 inline void PushDepth()
 {
 m_depthStack.push( m_layerDepth );
 }

 inline void PopDepth()
 {
 m_layerDepth = m_depthStack.top();
 m_depthStack.pop();
 }

 virtual void EnableDepthTest( bool aEnabled = false ) {};

 virtual bool IsContextLocked()
 {
 return false;
 }


 virtual void LockContext( int aClientCookie ) {}

 virtual void UnlockContext( int aClientCookie ) {}


 virtual void BeginDrawing() {};

 virtual void EndDrawing() {};
protected:
 
 virtual void beginUpdate() {}

 virtual void endUpdate() {}

 

 inline void computeWorldScale()
 {
 m_worldScale = m_screenDPI * m_worldUnitLength * m_zoomFactor;
 }

 double computeMinGridSpacing() const;

 static const int MIN_DEPTH;
 static const int MAX_DEPTH;

 static const int GRID_DEPTH;

 COLOR4D getCursorColor() const;

 // ---------------
 // Settings observer interface
 // ---------------
 void OnGalDisplayOptionsChanged( const GAL_DISPLAY_OPTIONS& aOptions ) override;

 virtual bool updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions );

 GAL_DISPLAY_OPTIONS& m_options;
 UTIL::LINK m_observerLink;

 std::stack<double> m_depthStack; 
 VECTOR2I m_screenSize; 

 double m_worldUnitLength; 
 double m_screenDPI; 
 VECTOR2D m_lookAtPoint; 

 double m_zoomFactor; 
 double m_rotation; 
 MATRIX3x3D m_worldScreenMatrix; 
 MATRIX3x3D m_screenWorldMatrix; 
 double m_worldScale; 

 bool m_globalFlipX; 
 bool m_globalFlipY; 

 float m_lineWidth; 

 bool m_isFillEnabled; 
 bool m_isStrokeEnabled; 

 COLOR4D m_fillColor; 
 COLOR4D m_strokeColor; 
 COLOR4D m_clearColor;

 double m_layerDepth; 
 VECTOR2D m_depthRange; 

 // Grid settings
 bool m_gridVisibility; 
 GRID_STYLE m_gridStyle; 
 VECTOR2D m_gridSize; 
 VECTOR2D m_gridOrigin; 
 VECTOR2D m_gridOffset; 
 COLOR4D m_gridColor; 
 COLOR4D m_axesColor; 
 bool m_axesEnabled; 
 int m_gridTick; 
 float m_gridLineWidth; 
 int m_gridMinSpacing; 

 // Cursor settings
 bool m_isCursorEnabled; 
 bool m_forceDisplayCursor; 
 COLOR4D m_cursorColor; 
 bool m_fullscreenCursor; 
 VECTOR2D m_cursorPosition; 

 STROKE_FONT m_strokeFont; 

 KICURSOR m_currentNativeCursor; 

private:
 struct TEXT_PROPERTIES
 {
 VECTOR2D m_glyphSize; 
 EDA_TEXT_HJUSTIFY_T m_horizontalJustify; 
 EDA_TEXT_VJUSTIFY_T m_verticalJustify; 
 bool m_bold;
 bool m_italic;
 bool m_underlined;
 bool m_mirrored;
 } textProperties;
};


class GAL_CONTEXT_LOCKER
{
public:
 GAL_CONTEXT_LOCKER( GAL* aGal ) :
 m_gal( aGal )
 {
 m_cookie = rand();
 m_gal->LockContext( m_cookie );
 }

 ~GAL_CONTEXT_LOCKER()
 {
 m_gal->UnlockContext( m_cookie );
 }

protected:
 GAL* m_gal;
 int m_cookie;
};


class GAL_UPDATE_CONTEXT : public GAL_CONTEXT_LOCKER
{
public:
 GAL_UPDATE_CONTEXT( GAL* aGal ) :
 GAL_CONTEXT_LOCKER( aGal )
 {
 m_gal->beginUpdate();
 }

 ~GAL_UPDATE_CONTEXT()
 {
 m_gal->endUpdate();
 }
};


class GAL_DRAWING_CONTEXT : public GAL_CONTEXT_LOCKER
{
public:
 GAL_DRAWING_CONTEXT( GAL* aGal ) :
 GAL_CONTEXT_LOCKER( aGal )
 {
 m_gal->BeginDrawing();
 }

 ~GAL_DRAWING_CONTEXT()
 {
 m_gal->EndDrawing();
 }
};


}; // namespace KIGFX

#endif /* GRAPHICSABSTRACTIONLAYER_H_ */