kicad/include/gal/cairo/cairo_gal.h

502 lines
18 KiB
C++

/*
* 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) 2012-2021 KiCad Developers, see AUTHORS.txt for contributors.
* Copyright (C) 2017-2018 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* CairoGal - 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
*/
#ifndef CAIROGAL_H_
#define CAIROGAL_H_
#include <map>
#include <iterator>
#include <cairo.h>
#include <gal/graphics_abstraction_layer.h>
#include <wx/dcbuffer.h>
#include <memory>
/**
* The Cairo implementation of the graphics abstraction layer.
*
* Quote from Wikipedia:
* " Cairo is a software library used to provide a vector graphics-based, device-independent
* API for software developers. It is designed to provide primitives for 2-dimensional
* drawing across a number of different backends. "
*
* Cairo offers also backends for PostScript and PDF surfaces. So it can be used for printing
* of KiCad graphics surfaces as well.
*/
namespace KIGFX
{
class CAIRO_COMPOSITOR;
class CAIRO_GAL_BASE : public GAL
{
public:
CAIRO_GAL_BASE( GAL_DISPLAY_OPTIONS& aDisplayOptions );
~CAIRO_GAL_BASE();
bool IsCairoEngine() override { return true; }
// ---------------
// Drawing methods
// ---------------
/// @copydoc GAL::DrawLine()
void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
/// @copydoc GAL::DrawSegment()
void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth ) override;
/// @copydoc GAL::DrawCircle()
void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius ) override;
/// @copydoc GAL::DrawArc()
void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle ) override;
/// @copydoc GAL::DrawArcSegment()
/// Note: aMaxError is not used in Cairo, because Cairo can draw true arcs
void DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle, double aWidth,
double aMaxError ) override;
/// @copydoc GAL::DrawRectangle()
void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
/// @copydoc GAL::DrawPolyline()
void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) override { drawPoly( aPointList ); }
void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) override
{
drawPoly( aPointList, aListSize );
}
void DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain ) override { drawPoly( aLineChain ); }
/// @copydoc GAL::DrawPolygon()
void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) override { drawPoly( aPointList ); }
void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) override
{
drawPoly( aPointList, aListSize );
}
void DrawPolygon( const SHAPE_POLY_SET& aPolySet, bool aStrokeTriangulation = false ) override;
void DrawPolygon( const SHAPE_LINE_CHAIN& aPolySet ) override;
/// @copydoc GAL::DrawCurve()
void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
const VECTOR2D& controlPointB, const VECTOR2D& endPoint,
double aFilterValue = 0.0 ) override;
/// @copydoc GAL::DrawBitmap()
void DrawBitmap( const BITMAP_BASE& aBitmap ) override;
// --------------
// Screen methods
// --------------
/// Resizes the canvas.
void ResizeScreen( int aWidth, int aHeight ) override;
/// @copydoc GAL::Flush()
void Flush() override;
/// @copydoc GAL::ClearScreen()
void ClearScreen() override;
// -----------------
// Attribute setting
// -----------------
/// @copydoc GAL::SetIsFill()
void SetIsFill( bool aIsFillEnabled ) override;
/// @copydoc GAL::SetIsStroke()
void SetIsStroke( bool aIsStrokeEnabled ) override;
/// @copydoc GAL::SetStrokeColor()
void SetStrokeColor( const COLOR4D& aColor ) override;
/// @copydoc GAL::SetFillColor()
void SetFillColor( const COLOR4D& aColor ) override;
/// @copydoc GAL::SetLineWidth()
void SetLineWidth( float aLineWidth ) override;
/// @copydoc GAL::SetLayerDepth()
void SetLayerDepth( double aLayerDepth ) override;
// --------------
// Transformation
// --------------
/// @copydoc GAL::Transform()
void Transform( const MATRIX3x3D& aTransformation ) override;
/// @copydoc GAL::Rotate()
void Rotate( double aAngle ) override;
/// @copydoc GAL::Translate()
void Translate( const VECTOR2D& aTranslation ) override;
/// @copydoc GAL::Scale()
void Scale( const VECTOR2D& aScale ) override;
/// @copydoc GAL::Save()
void Save() override;
/// @copydoc GAL::Restore()
void Restore() override;
// --------------------------------------------
// Group methods
// ---------------------------------------------
/// @copydoc GAL::BeginGroup()
int BeginGroup() override;
/// @copydoc GAL::EndGroup()
void EndGroup() override;
/// @copydoc GAL::DrawGroup()
void DrawGroup( int aGroupNumber ) override;
/// @copydoc GAL::ChangeGroupColor()
void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor ) override;
/// @copydoc GAL::ChangeGroupDepth()
void ChangeGroupDepth( int aGroupNumber, int aDepth ) override;
/// @copydoc GAL::DeleteGroup()
void DeleteGroup( int aGroupNumber ) override;
/// @copydoc GAL::ClearCache()
void ClearCache() override;
// --------------------------------------------------------
// Handling the world <-> screen transformation
// --------------------------------------------------------
/// @copydoc GAL::SetNegativeDrawMode()
void SetNegativeDrawMode( bool aSetting ) override;
// -------
// Cursor
// -------
/// @copydoc GAL::DrawCursor()
void DrawCursor( const VECTOR2D& aCursorPosition ) override;
void EnableDepthTest( bool aEnabled = false ) override;
///< @copydoc GAL::DrawGrid()
void DrawGrid() override;
protected:
// Geometric transforms according to the m_currentWorld2Screen transform matrix:
const double xform( double x ); // scale
const VECTOR2D xform( double x, double y ); // rotation, scale and offset
const VECTOR2D xform( const VECTOR2D& aP ); // rotation, scale and offset
/**
* Transform according to the rotation from m_currentWorld2Screen transform matrix.
*
* @param aAngle is the angle in radians to transform.
* @return the modified angle.
*/
const double angle_xform( const double aAngle );
/**
* Transform according to the rotation from m_currentWorld2Screen transform matrix
* for the start angle and the end angle of an arc.
*
* @param aStartAngle is the arc starting point in radians to transform
* @param aEndAngle is the arc ending point in radians to transform
*/
void arc_angles_xform_and_normalize( double& aStartAngle, double& aEndAngle );
/// @copydoc GAL::BeginDrawing()
void beginDrawing() override;
/// @copydoc GAL::EndDrawing()
void endDrawing() override;
void resetContext();
/**
* Draw a grid line (usually a simplified line function).
*
* @param aStartPoint is the start point of the line.
* @param aEndPoint is the end point of the line.
*/
void drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
void drawGridCross( const VECTOR2D& aPoint );
void drawGridPoint( const VECTOR2D& aPoint, double aWidth, double aHeight );
void drawAxes( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
void flushPath();
void storePath(); ///< Store the actual path
/**
* Blit cursor into the current screen.
*/
void blitCursor( wxMemoryDC& clientDC );
/// Drawing polygons & polylines is the same in Cairo, so here is the common code
void drawPoly( const std::deque<VECTOR2D>& aPointList );
void drawPoly( const VECTOR2D aPointList[], int aListSize );
void drawPoly( const SHAPE_LINE_CHAIN& aLineChain );
/**
* Return a valid key that can be used as a new group number.
*
* @return An unique group number that is not used by any other group.
*/
unsigned int getNewGroupNumber();
void syncLineWidth( bool aForceWidth = false, double aWidth = 0.0 );
void updateWorldScreenMatrix();
const VECTOR2D roundp( const VECTOR2D& v );
/// Super class definition
typedef GAL super;
/// Maximum number of arguments for one command
static const int MAX_CAIRO_ARGUMENTS = 4;
/// Definitions for the command recorder
enum GRAPHICS_COMMAND
{
CMD_SET_FILL, ///< Enable/disable filling
CMD_SET_STROKE, ///< Enable/disable stroking
CMD_SET_FILLCOLOR, ///< Set the fill color
CMD_SET_STROKECOLOR, ///< Set the stroke color
CMD_SET_LINE_WIDTH, ///< Set the line width
CMD_STROKE_PATH, ///< Set the stroke path
CMD_FILL_PATH, ///< Set the fill path
//CMD_TRANSFORM, ///< Transform the actual context
CMD_ROTATE, ///< Rotate the context
CMD_TRANSLATE, ///< Translate the context
CMD_SCALE, ///< Scale the context
CMD_SAVE, ///< Save the transformation matrix
CMD_RESTORE, ///< Restore the transformation matrix
CMD_CALL_GROUP ///< Call a group
};
/// Type definition for an graphics group element
struct GROUP_ELEMENT
{
GRAPHICS_COMMAND m_Command; ///< Command to execute
union {
double DblArg[MAX_CAIRO_ARGUMENTS]; ///< Arguments for Cairo commands
bool BoolArg; ///< A bool argument
int IntArg = 0; ///< An int argument
} m_Argument;
cairo_path_t* m_CairoPath = nullptr; ///< Pointer to a Cairo path
};
typedef std::deque<GROUP_ELEMENT> GROUP; ///< A graphic group type definition
// Variables for the grouping function
bool m_isGrouping; ///< Is grouping enabled ?
bool m_isElementAdded; ///< Was an graphic element added ?
std::map<int, GROUP> m_groups; ///< List of graphic groups
unsigned int m_groupCounter; ///< Counter used for generating group keys
GROUP* m_currentGroup; ///< Currently used group
double m_lineWidthInPixels;
bool m_lineWidthIsOdd;
cairo_matrix_t m_cairoWorldScreenMatrix; ///< Cairo world to screen transform matrix
cairo_matrix_t m_currentXform;
cairo_matrix_t m_currentWorld2Screen;
cairo_t* m_currentContext; ///< Currently used Cairo context for drawing
cairo_t* m_context; ///< Cairo image
cairo_surface_t* m_surface; ///< Cairo surface
/// List of surfaces that were created by painting images, to be cleaned up later
std::vector<cairo_surface_t*> m_imageSurfaces;
std::vector<cairo_matrix_t> m_xformStack;
/// Format used to store pixels
static constexpr cairo_format_t GAL_FORMAT = CAIRO_FORMAT_ARGB32;
};
class CAIRO_GAL : public CAIRO_GAL_BASE, public wxWindow
{
public:
/**
* @param aParent is the wxWidgets immediate wxWindow parent of this object.
* @param aMouseListener is the wxEvtHandler that should receive the mouse events, this
* can be can be any wxWindow, but is often a wxFrame container.
* @param aPaintListener is the wxEvtHandler that should receive the paint event. This
* can be any wxWindow, but is often a derived instance of this
* class or a containing wxFrame. The "paint event" here is a
* wxCommandEvent holding EVT_GAL_REDRAW, as sent by PostPaint().
*
* @param aName is the name of this window for use by wxWindow::FindWindowByName().
*/
CAIRO_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
wxEvtHandler* aMouseListener = nullptr, wxEvtHandler* aPaintListener = nullptr,
const wxString& aName = wxT( "CairoCanvas" ) );
~CAIRO_GAL();
///< @copydoc GAL::IsVisible()
bool IsVisible() const override
{
return IsShownOnScreen() && !GetClientRect().IsEmpty();
}
void ResizeScreen( int aWidth, int aHeight ) override;
bool Show( bool aShow ) override;
int BeginGroup() override;
void EndGroup() override;
void SetTarget( RENDER_TARGET aTarget ) override;
RENDER_TARGET GetTarget() const override;
void ClearTarget( RENDER_TARGET aTarget ) override;
/// @copydoc GAL::StartDiffLayer()
void StartDiffLayer() override;
/// @copydoc GAL::EndDiffLayer()
void EndDiffLayer() override;
/// @copydoc GAL::StartNegativesLayer()
void StartNegativesLayer() override;
/// @copydoc GAL::EndNegativesLayer()
void EndNegativesLayer() override;
/**
* Post an event to m_paint_listener.
*
* A post is used so that the actual drawing function can use a device context type that
* is not specific to the wxEVT_PAINT event, just by changing the PostPaint code.
*/
void PostPaint( wxPaintEvent& aEvent );
void SetMouseListener( wxEvtHandler* aMouseListener )
{
m_mouseListener = aMouseListener;
}
void SetPaintListener( wxEvtHandler* aPaintListener )
{
m_paintListener = aPaintListener;
}
/// @copydoc GAL::SetNativeCursorStyle()
bool SetNativeCursorStyle( KICURSOR aCursor ) override;
/// @copydoc GAL::BeginDrawing()
void beginDrawing() override;
/// @copydoc GAL::EndDrawing()
void endDrawing() override;
/// Prepare Cairo surfaces for drawing
void initSurface();
/// Destroy Cairo surfaces when are not needed anymore
void deinitSurface();
/// Allocate the bitmaps for drawing
void allocateBitmaps();
/// Allocate the bitmaps for drawing
void deleteBitmaps();
/// Prepare the compositor
void setCompositor();
// Event handlers
/**
* Paint event handler.
*
* @param aEvent is the paint event.
*/
void onPaint( wxPaintEvent& aEvent );
/**
* Mouse event handler, forwards the event to the child.
*
* @param aEvent is the mouse event to be forwarded.
*/
void skipMouseEvent( wxMouseEvent& aEvent );
/**
* Give the correct cursor image when the native widget asks for it.
*
* @param aEvent is the cursor event to plac the cursor into.
*/
void onSetNativeCursor( wxSetCursorEvent& aEvent );
///< Cairo-specific update handlers
bool updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions ) override;
protected:
// Compositor related variables
std::shared_ptr<CAIRO_COMPOSITOR> m_compositor; ///< Object for layers compositing
unsigned int m_mainBuffer; ///< Handle to the main buffer
unsigned int m_overlayBuffer; ///< Handle to the overlay buffer
unsigned int m_tempBuffer; ///< Handle to the temp buffer
unsigned int m_savedBuffer; ///< Handle to buffer to restore after rendering to temp buffer
RENDER_TARGET m_currentTarget; ///< Current rendering target
bool m_validCompositor; ///< Compositor initialization flag
// Variables related to wxWidgets
wxWindow* m_parentWindow; ///< Parent window
wxEvtHandler* m_mouseListener; ///< Mouse listener
wxEvtHandler* m_paintListener; ///< Paint listener
unsigned int m_bufferSize; ///< Size of buffers cairoOutput, bitmapBuffers
unsigned char* m_wxOutput; ///< wxImage compatible buffer
// Variables related to Cairo <-> wxWidgets
unsigned char* m_bitmapBuffer; ///< Storage of the Cairo image
int m_stride; ///< Stride value for Cairo
int m_wxBufferWidth;
bool m_isInitialized; ///< Are Cairo image & surface ready to use
COLOR4D m_backgroundColor; ///< Background color
wxCursor m_currentwxCursor; ///< wxCursor showing the current native cursor
};
} // namespace KIGFX
#endif // CAIROGAL_H_