include/wx/msw/dc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.h
   3 // Purpose:     wxDC class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_DC_H_
  13 #define _WX_DC_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "dc.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/dc.h"
  21
  22 // ---------------------------------------------------------------------------
  23 // macros
  24 // ---------------------------------------------------------------------------
  25
  26 #if wxUSE_DC_CACHEING
  27 /*
  28  * Cached blitting, maintaining a cache
  29  * of bitmaps required for transparent blitting
  30  * instead of constant creation/deletion
  31  */
  32
  33 class wxDCCacheEntry: public wxObject
  34 {
  35 public:
  36     wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth);
  37     wxDCCacheEntry(WXHDC hDC, int depth);
  38     ~wxDCCacheEntry();
  39
  40     WXHBITMAP   m_bitmap;
  41     WXHDC       m_dc;
  42     int         m_width;
  43     int         m_height;
  44     int         m_depth;
  45 };
  46 #endif
  47
  48 class WXDLLEXPORT wxDC : public wxDCBase
  49 {
  50 public:
  51     wxDC();
  52     ~wxDC();
  53
  54     // implement base class pure virtuals
  55     // ----------------------------------
  56
  57     virtual void Clear();
  58
  59     virtual bool StartDoc(const wxString& message);
  60     virtual void EndDoc();
  61
  62     virtual void StartPage();
  63     virtual void EndPage();
  64
  65     virtual void SetFont(const wxFont& font);
  66     virtual void SetPen(const wxPen& pen);
  67     virtual void SetBrush(const wxBrush& brush);
  68     virtual void SetBackground(const wxBrush& brush);
  69     virtual void SetBackgroundMode(int mode);
  70 #if wxUSE_PALETTE
  71     virtual void SetPalette(const wxPalette& palette);
  72 #endif // wxUSE_PALETTE
  73
  74     virtual void DestroyClippingRegion();
  75
  76     virtual wxCoord GetCharHeight() const;
  77     virtual wxCoord GetCharWidth() const;
  78     virtual void DoGetTextExtent(const wxString& string,
  79                                  wxCoord *x, wxCoord *y,
  80                                  wxCoord *descent = NULL,
  81                                  wxCoord *externalLeading = NULL,
  82                                  wxFont *theFont = NULL) const;
  83
  84     virtual bool CanDrawBitmap() const;
  85     virtual bool CanGetTextExtent() const;
  86     virtual int GetDepth() const;
  87     virtual wxSize GetPPI() const;
  88
  89     virtual void SetMapMode(int mode);
  90     virtual void SetUserScale(double x, double y);
  91     virtual void SetSystemScale(double x, double y);
  92     virtual void SetLogicalScale(double x, double y);
  93     virtual void SetLogicalOrigin(wxCoord x, wxCoord y);
  94     virtual void SetDeviceOrigin(wxCoord x, wxCoord y);
  95     virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
  96     virtual void SetLogicalFunction(int function);
  97
  98     // implementation from now on
  99     // --------------------------
 100
 101     virtual void SetRop(WXHDC cdc);
 102     virtual void SelectOldObjects(WXHDC dc);
 103
 104     wxWindow *GetWindow() const { return m_canvas; }
 105     void SetWindow(wxWindow *win)
 106     {
 107         m_canvas = win;
 108
 109 #if wxUSE_PALETTE
 110         // if we have palettes use the correct one for this window
 111         InitializePalette();
 112 #endif // wxUSE_PALETTE
 113     }
 114
 115     WXHDC GetHDC() const { return m_hDC; }
 116     void SetHDC(WXHDC dc, bool bOwnsDC = FALSE)
 117     {
 118         m_hDC = dc;
 119         m_bOwnsDC = bOwnsDC;
 120     }
 121
 122     const wxBitmap& GetSelectedBitmap() const { return m_selectedBitmap; }
 123     wxBitmap& GetSelectedBitmap() { return m_selectedBitmap; }
 124
 125     // update the internal clip box variables
 126     void UpdateClipBox();
 127
 128 #if wxUSE_DC_CACHEING
 129     static wxDCCacheEntry* FindBitmapInCache(WXHDC hDC, int w, int h);
 130     static wxDCCacheEntry* FindDCInCache(wxDCCacheEntry* notThis, WXHDC hDC);
 131
 132     static void AddToBitmapCache(wxDCCacheEntry* entry);
 133     static void AddToDCCache(wxDCCacheEntry* entry);
 134     static void ClearCache();
 135 #endif
 136
 137 protected:
 138     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 139                              int style = wxFLOOD_SURFACE);
 140
 141     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
 142
 143     virtual void DoDrawPoint(wxCoord x, wxCoord y);
 144     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
 145
 146     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 147                            wxCoord x2, wxCoord y2,
 148                            wxCoord xc, wxCoord yc);
 149     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 150                                  wxCoord width, wxCoord height);
 151     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 152                                    double sa, double ea);
 153
 154     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 155     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 156                                         wxCoord width, wxCoord height,
 157                                         double radius);
 158     virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 159
 160     virtual void DoCrossHair(wxCoord x, wxCoord y);
 161
 162     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
 163     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 164                               bool useMask = FALSE);
 165
 166     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
 167     virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
 168                                    double angle);
 169
 170     virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 171                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 172                         int rop = wxCOPY, bool useMask = FALSE, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
 173
 174     // this is gnarly - we can't even call this function DoSetClippingRegion()
 175     // because of virtual function hiding
 176     virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
 177     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 178                                      wxCoord width, wxCoord height);
 179     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 180                                      wxCoord *width, wxCoord *height)
 181     {
 182         GetClippingBox(x, y, width, height);
 183     }
 184
 185     virtual void DoGetSize(int *width, int *height) const;
 186     virtual void DoGetSizeMM(int* width, int* height) const;
 187
 188     virtual void DoDrawLines(int n, wxPoint points[],
 189                              wxCoord xoffset, wxCoord yoffset);
 190     virtual void DoDrawPolygon(int n, wxPoint points[],
 191                                wxCoord xoffset, wxCoord yoffset,
 192                                int fillStyle = wxODDEVEN_RULE);
 193
 194
 195 #if wxUSE_PALETTE
 196     // MSW specific, select a logical palette into the HDC
 197     // (tell windows to translate pixel from other palettes to our custom one
 198     // and vice versa)
 199     // Realize tells it to also reset the system palette to this one.
 200     void DoSelectPalette(bool realize = FALSE);
 201
 202     // Find out what palette our parent window has, then select it into the dc
 203     void InitializePalette();
 204 #endif // wxUSE_PALETTE
 205
 206     // common part of DoDrawText() and DoDrawRotatedText()
 207     void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
 208
 209     // common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
 210     void SetClippingHrgn(WXHRGN hrgn);
 211
 212     // MSW-specific member variables
 213     // -----------------------------
 214
 215     // the window associated with this DC (may be NULL)
 216     wxWindow         *m_canvas;
 217
 218     wxBitmap          m_selectedBitmap;
 219
 220     // TRUE => DeleteDC() in dtor, FALSE => only ReleaseDC() it
 221     bool              m_bOwnsDC:1;
 222
 223     // our HDC
 224     WXHDC             m_hDC;
 225
 226     // Store all old GDI objects when do a SelectObject, so we can select them
 227     // back in (this unselecting user's objects) so we can safely delete the
 228     // DC.
 229     WXHBITMAP         m_oldBitmap;
 230     WXHPEN            m_oldPen;
 231     WXHBRUSH          m_oldBrush;
 232     WXHFONT           m_oldFont;
 233
 234 #if wxUSE_PALETTE
 235     WXHPALETTE        m_oldPalette;
 236 #endif // wxUSE_PALETTE
 237
 238 #if wxUSE_DC_CACHEING
 239     static wxList     sm_bitmapCache;
 240     static wxList     sm_dcCache;
 241 #endif
 242
 243     DECLARE_DYNAMIC_CLASS(wxDC)
 244     DECLARE_NO_COPY_CLASS(wxDC)
 245 };
 246
 247 // ----------------------------------------------------------------------------
 248 // wxDCTemp: a wxDC which doesn't free the given HDC (used by wxWindows
 249 // only/mainly)
 250 // ----------------------------------------------------------------------------
 251
 252 class WXDLLEXPORT wxDCTemp : public wxDC
 253 {
 254 public:
 255     wxDCTemp(WXHDC hdc) { SetHDC(hdc); }
 256     virtual ~wxDCTemp() { SetHDC((WXHDC)NULL); }
 257 };
 258
 259 #endif
 260     // _WX_DC_H_