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kicad/include/gal/cairo/cairo_gal.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
*
* 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 <boost/smart_ptr/shared_ptr.hpp>
#include <wx/dcbuffer.h>
#if defined(__WXMSW__)
#define SCREEN_DEPTH 24
#else
#if wxCHECK_VERSION( 2, 9, 0 )
#define SCREEN_DEPTH wxBITMAP_SCREEN_DEPTH
#else
#define SCREEN_DEPTH 32
#endif
#endif
/**
* @brief Class CAIRO_GAL is 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. "
* <br>
* 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 : public GAL, public wxWindow
{
public:
/**
* Constructor CAIRO_GAL
*
* @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( wxWindow* aParent, wxEvtHandler* aMouseListener = NULL,
wxEvtHandler* aPaintListener = NULL, const wxString& aName = wxT( "CairoCanvas" ) );
virtual ~CAIRO_GAL();
// ---------------
// Drawing methods
// ---------------
/// @copydoc GAL::BeginDrawing()
virtual void BeginDrawing();
/// @copydoc GAL::EndDrawing()
virtual void EndDrawing();
/// @copydoc GAL::DrawLine()
virtual void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
/// @copydoc GAL::DrawSegment()
virtual void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint, double aWidth );
/// @copydoc GAL::DrawCircle()
virtual void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius );
/// @copydoc GAL::DrawArc()
virtual void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle );
/// @copydoc GAL::DrawRectangle()
virtual void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
/// @copydoc GAL::DrawPolyline()
virtual void DrawPolyline( std::deque<VECTOR2D>& aPointList );
/// @copydoc GAL::DrawPolygon()
virtual void DrawPolygon( const std::deque<VECTOR2D>& aPointList );
/// @copydoc GAL::DrawCurve()
virtual void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
const VECTOR2D& controlPointB, const VECTOR2D& endPoint );
// --------------
// Screen methods
// --------------
/// @brief Resizes the canvas.
virtual void ResizeScreen( int aWidth, int aHeight );
/// @brief Shows/hides the GAL canvas
virtual bool Show( bool aShow );
/// @copydoc GAL::Flush()
virtual void Flush();
/// @copydoc GAL::ClearScreen()
virtual void ClearScreen();
// -----------------
// Attribute setting
// -----------------
/// @copydoc GAL::SetIsFill()
virtual void SetIsFill( bool aIsFillEnabled );
/// @copydoc GAL::SetIsStroke()
virtual void SetIsStroke( bool aIsStrokeEnabled );
/// @copydoc GAL::SetStrokeColor()
virtual void SetStrokeColor( const COLOR4D& aColor );
/// @copydoc GAL::SetFillColor()
virtual void SetFillColor( const COLOR4D& aColor );
/// @copydoc GAL::SetLineWidth()
virtual void SetLineWidth( double aLineWidth );
/// @copydoc GAL::SetLayerDepth()
virtual void SetLayerDepth( double aLayerDepth );
// --------------
// Transformation
// --------------
/// @copydoc GAL::Transform()
virtual void Transform( MATRIX3x3D aTransformation );
/// @copydoc GAL::Rotate()
virtual void Rotate( double aAngle );
/// @copydoc GAL::Translate()
virtual void Translate( const VECTOR2D& aTranslation );
/// @copydoc GAL::Scale()
virtual void Scale( const VECTOR2D& aScale );
/// @copydoc GAL::Save()
virtual void Save();
/// @copydoc GAL::Restore()
virtual void Restore();
// --------------------------------------------
// Group methods
// ---------------------------------------------
/// @copydoc GAL::BeginGroup()
virtual int BeginGroup();
/// @copydoc GAL::EndGroup()
virtual void EndGroup();
/// @copydoc GAL::DrawGroup()
virtual void DrawGroup( int aGroupNumber );
/// @copydoc GAL::ChangeGroupColor()
virtual void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor );
/// @copydoc GAL::ChangeGroupDepth()
virtual void ChangeGroupDepth( int aGroupNumber, int aDepth );
/// @copydoc GAL::DeleteGroup()
virtual void DeleteGroup( int aGroupNumber );
/// @copydoc GAL::ClearCache()
virtual void ClearCache();
// --------------------------------------------------------
// Handling the world <-> screen transformation
// --------------------------------------------------------
/// @copydoc GAL::SaveScreen()
virtual void SaveScreen();
/// @copydoc GAL::RestoreScreen()
virtual void RestoreScreen();
/// @copydoc GAL::SetTarget()
virtual void SetTarget( RENDER_TARGET aTarget );
/// @copydoc GAL::GetTarget()
virtual RENDER_TARGET GetTarget() const;
/// @copydoc GAL::ClearTarget()
virtual void ClearTarget( RENDER_TARGET aTarget );
// -------
// Cursor
// -------
/// @copydoc GAL::DrawCursor()
virtual void DrawCursor( const VECTOR2D& aCursorPosition );
/**
* Function PostPaint
* posts 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.
*/
void PostPaint()
{
if( paintListener )
{
wxPaintEvent redrawEvent;
wxPostEvent( paintListener, redrawEvent );
}
}
void SetMouseListener( wxEvtHandler* aMouseListener )
{
mouseListener = aMouseListener;
}
void SetPaintListener( wxEvtHandler* aPaintListener )
{
paintListener = aPaintListener;
}
protected:
virtual void drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
private:
/// Super class definition
typedef GAL super;
// Compositing variables
boost::shared_ptr<CAIRO_COMPOSITOR> compositor; ///< Object for layers compositing
unsigned int mainBuffer; ///< Handle to the main buffer
unsigned int overlayBuffer; ///< Handle to the overlay buffer
RENDER_TARGET currentTarget; ///< Current rendering target
bool validCompositor; ///< Compositor initialization flag
// Variables related to wxWidgets
wxWindow* parentWindow; ///< Parent window
wxEvtHandler* mouseListener; ///< Mouse listener
wxEvtHandler* paintListener; ///< Paint listener
unsigned int bufferSize; ///< Size of buffers cairoOutput, bitmapBuffers
unsigned char* wxOutput; ///< wxImage comaptible buffer
// Cursor variables
std::deque<wxColour> savedCursorPixels; ///< Saved pixels of the cursor
bool isDeleteSavedPixels; ///< True, if the saved pixels can be discarded
wxPoint savedCursorPosition; ///< The last cursor position
wxBitmap* cursorPixels; ///< Cursor pixels
wxBitmap* cursorPixelsSaved; ///< Saved cursor pixels
int cursorSize; ///< Cursor size
VECTOR2D cursorPosition; ///< Current cursor position
/// Maximum number of arguments for one command
static const int MAX_CAIRO_ARGUMENTS = 6;
/// 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
typedef struct
{
GRAPHICS_COMMAND command; ///< Command to execute
double arguments[MAX_CAIRO_ARGUMENTS]; ///< Arguments for Cairo commands
bool boolArgument; ///< A bool argument
int intArgument; ///< An int argument
cairo_path_t* cairoPath; ///< Pointer to a Cairo path
} GROUP_ELEMENT;
// Variables for the grouping function
bool isGrouping; ///< Is grouping enabled ?
bool isElementAdded; ///< Was an graphic element added ?
typedef std::deque<GROUP_ELEMENT> GROUP; ///< A graphic group type definition
std::map<int, GROUP> groups; ///< List of graphic groups
unsigned int groupCounter; ///< Counter used for generating keys for groups
GROUP* currentGroup; ///< Currently used group
// Variables related to Cairo <-> wxWidgets
cairo_matrix_t cairoWorldScreenMatrix; ///< Cairo world to screen transformation matrix
cairo_t* currentContext; ///< Currently used Cairo context for drawing
cairo_t* context; ///< Cairo image
cairo_surface_t* surface; ///< Cairo surface
unsigned int* bitmapBuffer; ///< Storage of the cairo image
unsigned int* bitmapBufferBackup; ///< Backup storage of the cairo image
int stride; ///< Stride value for Cairo
bool isInitialized; ///< Are Cairo image & surface ready to use
// Methods
void storePath(); ///< Store the actual path
// Event handlers
/**
* @brief Paint event handler.
*
* @param aEvent is the paint event.
*/
void onPaint( wxPaintEvent& aEvent );
/**
* @brief Mouse event handler, forwards the event to the child.
*
* @param aEvent is the mouse event to be forwarded.
*/
void skipMouseEvent( wxMouseEvent& aEvent );
/// @copydoc GAL::initCursor()
virtual void initCursor( int aCursorSize );
/**
* @brief Blits cursor into the current screen.
*/
virtual void blitCursor( wxBufferedDC& clientDC );
/// 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();
/**
* @brief Returns 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();
/// Format used to store pixels
static const cairo_format_t GAL_FORMAT = CAIRO_FORMAT_RGB24;
};
} // namespace KIGFX
#endif // CAIROGAL_H_
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