check for self-assignment in operator=

[wxWidgets.git] / include / wx / msw / dc.h

diff --git a/include/wx/msw/dc.h b/include/wx/msw/dc.h
index 54c6302975696320ddb0f53abb439714e67e6ea4..0622448279490bec7a5fd872cfd096a82fd2d1da 100644 (file)
--- a/include/wx/msw/dc.h
+++ b/include/wx/msw/dc.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        dc.h
+// Name:        wx/msw/dc.h

 // Purpose:     wxDC class
 // Author:      Julian Smart
 // Modified by:
 // Purpose:     wxDC class
 // Author:      Julian Smart
 // Modified by:


@@ -9,12 +9,8 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#ifndef _WX_DC_H_
-#define _WX_DC_H_
-
-#ifdef __GNUG__
-    #pragma interface "dc.h"
-#endif
+#ifndef _WX_MSW_DC_H_
+#define _WX_MSW_DC_H_

 
 #include "wx/defs.h"
 #include "wx/dc.h"
 
 #include "wx/defs.h"
 #include "wx/dc.h"


@@ -23,61 +19,35 @@
 // macros
 // ---------------------------------------------------------------------------
 
 // macros
 // ---------------------------------------------------------------------------
 

-// Logical to device
-// Absolute
-#define XLOG2DEV(x) (x)
-#define YLOG2DEV(y) (y)
-
-// Relative
-#define XLOG2DEVREL(x) (x)
-#define YLOG2DEVREL(y) (y)
-
-// Device to logical
-// Absolute
-#define XDEV2LOG(x) (x)
-
-#define YDEV2LOG(y) (y)
-
-// Relative
-#define XDEV2LOGREL(x) (x)
-#define YDEV2LOGREL(y) (y)
-
+#if wxUSE_DC_CACHEING

 /*
 /*

- * Have the same macros as for XView but not for every operation:
- * just for calculating window/viewport extent (a better way of scaling).
+ * Cached blitting, maintaining a cache
+ * of bitmaps required for transparent blitting
+ * instead of constant creation/deletion

  */
 
  */
 

-// Logical to device
-// Absolute
-#define MS_XLOG2DEV(x) LogicalToDevice(x)
-
-#define MS_YLOG2DEV(y) LogicalToDevice(y)
-
-// Relative
-#define MS_XLOG2DEVREL(x) LogicalToDeviceXRel(x)
-#define MS_YLOG2DEVREL(y) LogicalToDeviceYRel(y)
-
-// Device to logical
-// Absolute
-#define MS_XDEV2LOG(x) DeviceToLogicalX(x)
-
-#define MS_YDEV2LOG(y) DeviceToLogicalY(y)
-
-// Relative
-#define MS_XDEV2LOGREL(x) DeviceToLogicalXRel(x)
-#define MS_YDEV2LOGREL(y) DeviceToLogicalYRel(y)
-
-#define YSCALE(y) (yorigin - (y))
-
-#define     wx_round(a)    (int)((a)+.5)
-
-class WXDLLEXPORT wxDC : public wxDCBase
+class wxDCCacheEntry: public wxObject

 {
 {

-    DECLARE_DYNAMIC_CLASS(wxDC)
+public:
+    wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth);
+    wxDCCacheEntry(WXHDC hDC, int depth);
+    virtual ~wxDCCacheEntry();
+
+    WXHBITMAP   m_bitmap;
+    WXHDC       m_dc;
+    int         m_width;
+    int         m_height;
+    int         m_depth;
+};
+#endif

 
 

+// this is an ABC: use one of the derived classes to create a DC associated
+// with a window, screen, printer and so on
+class WXDLLIMPEXP_CORE wxMSWDCImpl: public wxDCImpl
+{

 public:
 public:

-    wxDC();
-    ~wxDC();
+    wxMSWDCImpl(wxDC *owner, WXHDC hDC);
+    virtual ~wxMSWDCImpl();

 
     // implement base class pure virtuals
     // ----------------------------------
 
     // implement base class pure virtuals
     // ----------------------------------


@@ -95,109 +65,221 @@ public:
     virtual void SetBrush(const wxBrush& brush);
     virtual void SetBackground(const wxBrush& brush);
     virtual void SetBackgroundMode(int mode);
     virtual void SetBrush(const wxBrush& brush);
     virtual void SetBackground(const wxBrush& brush);
     virtual void SetBackgroundMode(int mode);

+#if wxUSE_PALETTE

     virtual void SetPalette(const wxPalette& palette);
     virtual void SetPalette(const wxPalette& palette);

+#endif // wxUSE_PALETTE

 
     virtual void DestroyClippingRegion();
 
 
     virtual void DestroyClippingRegion();
 

-    virtual long GetCharHeight() const;
-    virtual long GetCharWidth() const;
-    virtual void GetTextExtent(const wxString& string,
-                               long *x, long *y,
-                               long *descent = NULL,
-                               long *externalLeading = NULL,
-                               wxFont *theFont = NULL) const;
+    virtual wxCoord GetCharHeight() const;
+    virtual wxCoord GetCharWidth() const;

 
     virtual bool CanDrawBitmap() const;
     virtual bool CanGetTextExtent() const;
     virtual int GetDepth() const;
     virtual wxSize GetPPI() const;
 
 
     virtual bool CanDrawBitmap() const;
     virtual bool CanGetTextExtent() const;
     virtual int GetDepth() const;
     virtual wxSize GetPPI() const;
 

-    virtual void SetMapMode(int mode);
+
+    virtual void SetMapMode(wxMappingMode mode);

     virtual void SetUserScale(double x, double y);
     virtual void SetUserScale(double x, double y);

-    virtual void SetSystemScale(double x, double y);

     virtual void SetLogicalScale(double x, double y);
     virtual void SetLogicalScale(double x, double y);

-    virtual void SetLogicalOrigin(long x, long y);
-    virtual void SetDeviceOrigin(long x, long y);
+    virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
+    virtual void SetDeviceOrigin(wxCoord x, wxCoord y);

     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);

-    virtual void SetLogicalFunction(int function);
+
+    virtual void SetLogicalFunction(wxRasterOperationMode function);

 
     // implementation from now on
     // --------------------------
 
     virtual void SetRop(WXHDC cdc);
 
     // implementation from now on
     // --------------------------
 
     virtual void SetRop(WXHDC cdc);

-    virtual void DoClipping(WXHDC cdc);

     virtual void SelectOldObjects(WXHDC dc);
 
     virtual void SelectOldObjects(WXHDC dc);
 

-    wxWindow *GetWindow() const { return m_canvas; }
-    void SetWindow(wxWindow *win) { m_canvas = win; }
+    void SetWindow(wxWindow *win)
+    {
+        m_window = win;
+
+#if wxUSE_PALETTE
+        // if we have palettes use the correct one for this window
+        InitializePalette();
+#endif // wxUSE_PALETTE
+    }

 
     WXHDC GetHDC() const { return m_hDC; }
 
     WXHDC GetHDC() const { return m_hDC; }

-    void SetHDC(WXHDC dc, bool bOwnsDC = FALSE)
+    void SetHDC(WXHDC dc, bool bOwnsDC = false)

     {
         m_hDC = dc;
         m_bOwnsDC = bOwnsDC;
     {
         m_hDC = dc;
         m_bOwnsDC = bOwnsDC;

+
+        // we might have a pre existing clipping region, make sure that we
+        // return it if asked -- but avoid calling ::GetClipBox() right now as
+        // it could be unnecessary wasteful
+        m_clipping = true;
+        m_clipX1 =
+        m_clipX2 = 0;

     }
 
     }
 

+    const wxBitmap& GetSelectedBitmap() const { return m_selectedBitmap; }
+    wxBitmap& GetSelectedBitmap() { return m_selectedBitmap; }
+
+    // update the internal clip box variables
+    void UpdateClipBox();
+
+#if wxUSE_DC_CACHEING
+    static wxDCCacheEntry* FindBitmapInCache(WXHDC hDC, int w, int h);
+    static wxDCCacheEntry* FindDCInCache(wxDCCacheEntry* notThis, WXHDC hDC);
+
+    static void AddToBitmapCache(wxDCCacheEntry* entry);
+    static void AddToDCCache(wxDCCacheEntry* entry);
+    static void ClearCache();
+#endif
+
+    // RTL related functions
+    // ---------------------
+
+    // get or change the layout direction (LTR or RTL) for this dc,
+    // wxLayout_Default is returned if layout direction is not supported
+    virtual wxLayoutDirection GetLayoutDirection() const;
+    virtual void SetLayoutDirection(wxLayoutDirection dir);
+

 protected:
 protected:

-    virtual void DoFloodFill(long x, long y, const wxColour& col,
-                             int style = wxFLOOD_SURFACE);
+    void Init()
+    {
+        m_bOwnsDC = false;
+        m_hDC = NULL;
+
+        m_oldBitmap = NULL;
+        m_oldPen = NULL;
+        m_oldBrush = NULL;
+        m_oldFont = NULL;
+
+#if wxUSE_PALETTE
+        m_oldPalette = NULL;
+#endif // wxUSE_PALETTE
+    }

 
 

-    virtual bool DoGetPixel(long x, long y, wxColour *col) const;
+    // create an uninitialized DC: this should be only used by the derived
+    // classes
+    wxMSWDCImpl( wxDC *owner ) : wxDCImpl( owner ) { Init(); }

 
 

-    virtual void DoDrawPoint(long x, long y);
-    virtual void DoDrawLine(long x1, long y1, long x2, long y2);
+    void RealizeScaleAndOrigin();

 
 

-    virtual void DoDrawArc(long x1, long y1,
-                           long x2, long y2,
-                           long xc, long yc);
-    virtual void DoDrawEllipticArc(long x, long y, long w, long h,
+public:
+    virtual void DoGetTextExtent(const wxString& string,
+                                 wxCoord *x, wxCoord *y,
+                                 wxCoord *descent = NULL,
+                                 wxCoord *externalLeading = NULL,
+                                 const wxFont *theFont = NULL) const;
+    virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const;
+
+    virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
+                             wxFloodFillStyle style = wxFLOOD_SURFACE);
+
+    virtual void DoGradientFillLinear(const wxRect& rect,
+                                      const wxColour& initialColour,
+                                      const wxColour& destColour,
+                                      wxDirection nDirection = wxEAST);
+
+    virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
+
+    virtual void DoDrawPoint(wxCoord x, wxCoord y);
+    virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
+
+    virtual void DoDrawArc(wxCoord x1, wxCoord y1,
+                           wxCoord x2, wxCoord y2,
+                           wxCoord xc, wxCoord yc);
+    virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
+                                 wxCoord width, wxCoord height);
+    virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,

                                    double sa, double ea);
 
                                    double sa, double ea);
 

-    virtual void DoDrawRectangle(long x, long y, long width, long height);
-    virtual void DoDrawRoundedRectangle(long x, long y,
-                                        long width, long height,
+    virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+    virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
+                                        wxCoord width, wxCoord height,

                                         double radius);
                                         double radius);

-    virtual void DoDrawEllipse(long x, long y, long width, long height);
+    virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);

 
 

-    virtual void DoCrossHair(long x, long y);
+#if wxUSE_SPLINES && !defined(__WXWINCE__)
+    virtual void DoDrawSpline(const wxPointList *points);
+#endif

 
 

-    virtual void DoDrawIcon(const wxIcon& icon, long x, long y);
-    virtual void DoDrawBitmap(const wxBitmap &bmp, long x, long y,
-                              bool useMask = FALSE);
+    virtual void DoCrossHair(wxCoord x, wxCoord y);

 
 

-    virtual void DoDrawText(const wxString& text, long x, long y);
+    virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
+    virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
+                              bool useMask = false);

 
 

-    virtual bool DoBlit(long xdest, long ydest, long width, long height,
-                        wxDC *source, long xsrc, long ysrc,
-                        int rop = wxCOPY, bool useMask = FALSE);
+    virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
+    virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
+                                   double angle);

 
 

-    // this is gnarly - we can't even call this function DoSetClippingRegion()
-    // because of virtual function hiding
-    virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
-    virtual void DoSetClippingRegion(long x, long y,
-                                     long width, long height);
-    virtual void DoGetClippingRegion(long *x, long *y,
-                                     long *width, long *height)
-    {
-        GetClippingBox(x, y, width, height);
-    }
+    virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
+                        wxDC *source, wxCoord xsrc, wxCoord ysrc,
+                        wxRasterOperationMode rop = wxCOPY, bool useMask = false, 
+                        wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord);
+
+    virtual bool DoStretchBlit(wxCoord xdest, wxCoord ydest,
+                               wxCoord dstWidth, wxCoord dstHeight,
+                               wxDC *source,
+                               wxCoord xsrc, wxCoord ysrc,
+                               wxCoord srcWidth, wxCoord srcHeight,
+                               wxRasterOperationMode rop = wxCOPY, bool useMask = false,
+                               wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord);
+
+    virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
+                                     wxCoord width, wxCoord height);
+    virtual void DoSetDeviceClippingRegion(const wxRegion& region);
+    virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
+                                  wxCoord *w, wxCoord *h) const;

 
 

-    virtual void DoGetSize(int *width, int *height) const;

     virtual void DoGetSizeMM(int* width, int* height) const;
 
     virtual void DoDrawLines(int n, wxPoint points[],
     virtual void DoGetSizeMM(int* width, int* height) const;
 
     virtual void DoDrawLines(int n, wxPoint points[],

-                             long xoffset, long yoffset);
+                             wxCoord xoffset, wxCoord yoffset);

     virtual void DoDrawPolygon(int n, wxPoint points[],
     virtual void DoDrawPolygon(int n, wxPoint points[],

-                               long xoffset, long yoffset,
-                               int fillStyle = wxODDEVEN_RULE);
+                               wxCoord xoffset, wxCoord yoffset,
+                               wxPolygonFillMode fillStyle = wxODDEVEN_RULE);
+    virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
+                                   wxCoord xoffset, wxCoord yoffset,
+                                   wxPolygonFillMode fillStyle = wxODDEVEN_RULE);
+    virtual wxBitmap DoGetAsBitmap(const wxRect *subrect) const
+    {
+        return subrect == NULL ? GetSelectedBitmap()
+                               : GetSelectedBitmap().GetSubBitmap(*subrect);
+    }
+
+
+#if wxUSE_PALETTE
+    // MSW specific, select a logical palette into the HDC
+    // (tell windows to translate pixel from other palettes to our custom one
+    // and vice versa)
+    // Realize tells it to also reset the system palette to this one.
+    void DoSelectPalette(bool realize = false);
+
+    // Find out what palette our parent window has, then select it into the dc
+    void InitializePalette();
+#endif // wxUSE_PALETTE
+
+protected:
+    // common part of DoDrawText() and DoDrawRotatedText()
+    void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
+
+    // common part of DoSetClippingRegion() and DoSetDeviceClippingRegion()
+    void SetClippingHrgn(WXHRGN hrgn);
+
+    // implementation of DoGetSize() for wxScreen/PrinterDC: this simply
+    // returns the size of the entire device this DC is associated with
+    //
+    // notice that we intentionally put it in a separate function instead of
+    // DoGetSize() itself because we want it to remain pure virtual both
+    // because each derived class should take care to define it as needed (this
+    // implementation is not at all always appropriate) and because we want
+    // wxDC to be an ABC to prevent it from being created directly
+    void GetDeviceSize(int *width, int *height) const;

 
 

-#if wxUSE_SPLINES
-    virtual void DoDrawSpline(wxList *points);
-#endif // wxUSE_SPLINES

 
     // MSW-specific member variables
 
     // MSW-specific member variables

-    int               m_windowExtX;
-    int               m_windowExtY;
+    // -----------------------------

 
     // the window associated with this DC (may be NULL)
     wxWindow         *m_canvas;
 
     // the window associated with this DC (may be NULL)
     wxWindow         *m_canvas;


@@ -207,10 +289,8 @@ protected:
     // TRUE => DeleteDC() in dtor, FALSE => only ReleaseDC() it
     bool              m_bOwnsDC:1;
 
     // TRUE => DeleteDC() in dtor, FALSE => only ReleaseDC() it
     bool              m_bOwnsDC:1;
 

-    // our HDC and its usage count: we only free it when the usage count drops
-    // to 0
+    // our HDC

     WXHDC             m_hDC;
     WXHDC             m_hDC;

-    int               m_hDCCount;

 
     // Store all old GDI objects when do a SelectObject, so we can select them
     // back in (this unselecting user's objects) so we can safely delete the
 
     // Store all old GDI objects when do a SelectObject, so we can select them
     // back in (this unselecting user's objects) so we can safely delete the


@@ -219,8 +299,69 @@ protected:
     WXHPEN            m_oldPen;
     WXHBRUSH          m_oldBrush;
     WXHFONT           m_oldFont;
     WXHPEN            m_oldPen;
     WXHBRUSH          m_oldBrush;
     WXHFONT           m_oldFont;

+
+#if wxUSE_PALETTE

     WXHPALETTE        m_oldPalette;
     WXHPALETTE        m_oldPalette;

-};
+#endif // wxUSE_PALETTE

 
 

+#if wxUSE_DC_CACHEING
+    static wxObjectList     sm_bitmapCache;
+    static wxObjectList     sm_dcCache;

 #endif
 #endif

-    // _WX_DC_H_
+
+    DECLARE_CLASS(wxMSWDCImpl)
+    wxDECLARE_NO_COPY_CLASS(wxMSWDCImpl);
+};
+
+// ----------------------------------------------------------------------------
+// wxDCTemp: a wxDC which doesn't free the given HDC (used by wxWidgets
+// only/mainly)
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_CORE wxDCTempImpl : public wxMSWDCImpl
+{
+public:
+    // construct a temporary DC with the specified HDC and size (it should be
+    // specified whenever we know it for this HDC)
+    wxDCTempImpl(wxDC *owner, WXHDC hdc, const wxSize& size )
+        : wxMSWDCImpl( owner, hdc ),
+          m_size(size)
+    {
+    }
+
+    virtual ~wxDCTempImpl()
+    {
+        // prevent base class dtor from freeing it
+        SetHDC((WXHDC)NULL);
+    }
+
+    virtual void DoGetSize(int *w, int *h) const
+    {
+        wxASSERT_MSG( m_size.IsFullySpecified(),
+                      _T("size of this DC hadn't been set and is unknown") );
+
+        if ( w )
+            *w = m_size.x;
+        if ( h )
+            *h = m_size.y;
+    }
+
+private:
+    // size of this DC must be explicitly set by SetSize() as we have no way to
+    // find it ourselves
+    const wxSize m_size;
+
+    wxDECLARE_NO_COPY_CLASS(wxDCTempImpl);
+};
+
+class WXDLLIMPEXP_CORE wxDCTemp : public wxDC
+{
+public:
+    wxDCTemp(WXHDC hdc, const wxSize& size = wxDefaultSize)
+        : wxDC(new wxDCTempImpl(this, hdc, size))
+    {
+    }
+};
+
+#endif // _WX_MSW_DC_H_
+