Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 405 insertions, 0 deletions

diff --git a/include/gal/cairo/cairo_gal.h b/include/gal/cairo/cairo_gal.h
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+++ b/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( const std::deque<VECTOR2D>& aPointList ) { drawPoly( aPointList ); }
+    virtual void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) { drawPoly( aPointList, aListSize ); }
+
+    /// @copydoc GAL::DrawPolygon()
+    virtual void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) { drawPoly( aPointList ); }
+    virtual void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) { drawPoly( aPointList, aListSize ); }
+
+    /// @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( const COLOR4D& aColor );
+
+    // -----------------
+    // 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( const 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::SetCursorSize()
+    virtual void SetCursorSize( unsigned int aCursorSize );
+
+    /// @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
+
+    /// 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
+    COLOR4D             backgroundColor;        ///< Background color
+
+    // 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 );
+
+    /**
+     * @brief Prepares cursor bitmap.
+     */
+    virtual void initCursor();
+
+    /**
+     * @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();
+
+    /// 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 );
+
+    /**
+     * @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;
+
+    ///> Opacity of a single layer
+    static const float LAYER_ALPHA;
+};
+} // namespace KIGFX
+
+#endif  // CAIROGAL_H_