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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16     #pragma interface "dc.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20
  21 // ---------------------------------------------------------------------------
  22 // macros
  23 // ---------------------------------------------------------------------------
  24
  25 #if wxUSE_DC_CACHEING
  26 /*
  27  * Cached blitting, maintaining a cache
  28  * of bitmaps required for transparent blitting
  29  * instead of constant creation/deletion
  30  */
  31
  32 class wxDCCacheEntry: public wxObject
  33 {
  34 public:
  35     wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth);
  36     wxDCCacheEntry(WXHDC hDC, int depth);
  37     ~wxDCCacheEntry();
  38
  39     WXHBITMAP   m_bitmap;
  40     WXHDC       m_dc;
  41     int         m_width;
  42     int         m_height;
  43     int         m_depth;
  44 };
  45 #endif
  46
  47 class WXDLLEXPORT wxDC : public wxDCBase
  48 {
  49 public:
  50     wxDC();
  51     ~wxDC();
  52
  53     // implement base class pure virtuals
  54     // ----------------------------------
  55
  56     virtual void Clear();
  57
  58     virtual bool StartDoc(const wxString& message);
  59     virtual void EndDoc();
  60
  61     virtual void StartPage();
  62     virtual void EndPage();
  63
  64     virtual void SetFont(const wxFont& font);
  65     virtual void SetPen(const wxPen& pen);
  66     virtual void SetBrush(const wxBrush& brush);
  67     virtual void SetBackground(const wxBrush& brush);
  68     virtual void SetBackgroundMode(int mode);
  69 #if wxUSE_PALETTE
  70     virtual void SetPalette(const wxPalette& palette);
  71 #endif // wxUSE_PALETTE
  72
  73     virtual void DestroyClippingRegion();
  74
  75     virtual wxCoord GetCharHeight() const;
  76     virtual wxCoord GetCharWidth() const;
  77     virtual void DoGetTextExtent(const wxString& string,
  78                                  wxCoord *x, wxCoord *y,
  79                                  wxCoord *descent = NULL,
  80                                  wxCoord *externalLeading = NULL,
  81                                  wxFont *theFont = NULL) const;
  82     virtual bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) 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         // we might have a pre existing clipping region, make sure that we
 122         // return it if asked -- but avoid calling ::GetClipBox() right now as
 123         // it could be unnecessary wasteful
 124         m_clipping = true;
 125         m_clipX1 =
 126         m_clipX2 = 0;
 127     }
 128
 129     const wxBitmap& GetSelectedBitmap() const { return m_selectedBitmap; }
 130     wxBitmap& GetSelectedBitmap() { return m_selectedBitmap; }
 131
 132     // update the internal clip box variables
 133     void UpdateClipBox();
 134
 135 #if wxUSE_DC_CACHEING
 136     static wxDCCacheEntry* FindBitmapInCache(WXHDC hDC, int w, int h);
 137     static wxDCCacheEntry* FindDCInCache(wxDCCacheEntry* notThis, WXHDC hDC);
 138
 139     static void AddToBitmapCache(wxDCCacheEntry* entry);
 140     static void AddToDCCache(wxDCCacheEntry* entry);
 141     static void ClearCache();
 142 #endif
 143
 144 protected:
 145     virtual bool DoFloodFill(wxCoord x, wxCoord y, const wxColour& col,
 146                              int style = wxFLOOD_SURFACE);
 147
 148     virtual bool DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const;
 149
 150     virtual void DoDrawPoint(wxCoord x, wxCoord y);
 151     virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
 152
 153     virtual void DoDrawArc(wxCoord x1, wxCoord y1,
 154                            wxCoord x2, wxCoord y2,
 155                            wxCoord xc, wxCoord yc);
 156     virtual void DoDrawCheckMark(wxCoord x, wxCoord y,
 157                                  wxCoord width, wxCoord height);
 158     virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 159                                    double sa, double ea);
 160
 161     virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 162     virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
 163                                         wxCoord width, wxCoord height,
 164                                         double radius);
 165     virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
 166
 167     virtual void DoCrossHair(wxCoord x, wxCoord y);
 168
 169     virtual void DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
 170     virtual void DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y,
 171                               bool useMask = FALSE);
 172
 173     virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y);
 174     virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
 175                                    double angle);
 176
 177     virtual bool DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
 178                         wxDC *source, wxCoord xsrc, wxCoord ysrc,
 179                         int rop = wxCOPY, bool useMask = FALSE, wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
 180
 181     // this is gnarly - we can't even call this function DoSetClippingRegion()
 182     // because of virtual function hiding
 183     virtual void DoSetClippingRegionAsRegion(const wxRegion& region);
 184     virtual void DoSetClippingRegion(wxCoord x, wxCoord y,
 185                                      wxCoord width, wxCoord height);
 186     virtual void DoGetClippingRegion(wxCoord *x, wxCoord *y,
 187                                      wxCoord *width, wxCoord *height)
 188     {
 189         GetClippingBox(x, y, width, height);
 190     }
 191     virtual void DoGetClippingBox(wxCoord *x, wxCoord *y,
 192                                   wxCoord *w, wxCoord *h) const;
 193
 194     virtual void DoGetSize(int *width, int *height) const;
 195     virtual void DoGetSizeMM(int* width, int* height) const;
 196
 197     virtual void DoDrawLines(int n, wxPoint points[],
 198                              wxCoord xoffset, wxCoord yoffset);
 199     virtual void DoDrawPolygon(int n, wxPoint points[],
 200                                wxCoord xoffset, wxCoord yoffset,
 201                                int fillStyle = wxODDEVEN_RULE);
 202     virtual void DoDrawPolyPolygon(int n, int count[], wxPoint points[],
 203                                    wxCoord xoffset, wxCoord yoffset,
 204                                    int fillStyle = wxODDEVEN_RULE);
 205
 206
 207 #if wxUSE_PALETTE
 208     // MSW specific, select a logical palette into the HDC
 209     // (tell windows to translate pixel from other palettes to our custom one
 210     // and vice versa)
 211     // Realize tells it to also reset the system palette to this one.
 212     void DoSelectPalette(bool realize = FALSE);
 213
 214     // Find out what palette our parent window has, then select it into the dc
 215     void InitializePalette();
 216 #endif // wxUSE_PALETTE
 217
 218     // common part of DoDrawText() and DoDrawRotatedText()
 219     void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
 220
 221     // common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
 222     void SetClippingHrgn(WXHRGN hrgn);
 223
 224     // MSW-specific member variables
 225     // -----------------------------
 226
 227     // the window associated with this DC (may be NULL)
 228     wxWindow         *m_canvas;
 229
 230     wxBitmap          m_selectedBitmap;
 231
 232     // TRUE => DeleteDC() in dtor, FALSE => only ReleaseDC() it
 233     bool              m_bOwnsDC:1;
 234
 235     // our HDC
 236     WXHDC             m_hDC;
 237
 238     // Store all old GDI objects when do a SelectObject, so we can select them
 239     // back in (this unselecting user's objects) so we can safely delete the
 240     // DC.
 241     WXHBITMAP         m_oldBitmap;
 242     WXHPEN            m_oldPen;
 243     WXHBRUSH          m_oldBrush;
 244     WXHFONT           m_oldFont;
 245
 246 #if wxUSE_PALETTE
 247     WXHPALETTE        m_oldPalette;
 248 #endif // wxUSE_PALETTE
 249
 250 #if wxUSE_DC_CACHEING
 251     static wxList     sm_bitmapCache;
 252     static wxList     sm_dcCache;
 253 #endif
 254
 255     DECLARE_DYNAMIC_CLASS(wxDC)
 256     DECLARE_NO_COPY_CLASS(wxDC)
 257 };
 258
 259 // ----------------------------------------------------------------------------
 260 // wxDCTemp: a wxDC which doesn't free the given HDC (used by wxWidgets
 261 // only/mainly)
 262 // ----------------------------------------------------------------------------
 263
 264 class WXDLLEXPORT wxDCTemp : public wxDC
 265 {
 266 public:
 267     wxDCTemp(WXHDC hdc) { SetHDC(hdc); }
 268     virtual ~wxDCTemp() { SetHDC((WXHDC)NULL); }
 269
 270 private:
 271     DECLARE_NO_COPY_CLASS(wxDCTemp)
 272 };
 273
 274 #endif
 275     // _WX_DC_H_