src/msw/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dc.cpp
   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 // ===========================================================================
  13 // declarations
  14 // ===========================================================================
  15
  16 // ---------------------------------------------------------------------------
  17 // headers
  18 // ---------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "dc.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/image.h"
  33     #include "wx/window.h"
  34     #include "wx/dc.h"
  35     #include "wx/utils.h"
  36     #include "wx/dialog.h"
  37     #include "wx/app.h"
  38     #include "wx/bitmap.h"
  39     #include "wx/dcmemory.h"
  40     #include "wx/log.h"
  41     #include "wx/icon.h"
  42 #endif
  43
  44 #include "wx/msw/private.h" // needs to be before #include <commdlg.h>
  45 #include "wx/msw/missing.h" // needs to be before #include <commdlg.h>
  46
  47 #include "wx/sysopt.h"
  48 #include "wx/dcprint.h"
  49 #include "wx/module.h"
  50 #include "wx/dynload.h"
  51
  52 #ifdef wxHAVE_RAW_BITMAP
  53 #include "wx/rawbmp.h"
  54 #endif
  55
  56 #include <string.h>
  57
  58 #if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
  59     #include <commdlg.h>
  60 #endif
  61
  62 #ifndef __WIN32__
  63     #include <print.h>
  64 #endif
  65
  66 #ifndef AC_SRC_ALPHA
  67 #define AC_SRC_ALPHA 1
  68 #endif
  69
  70 /* Quaternary raster codes */
  71 #ifndef MAKEROP4
  72 #define MAKEROP4(fore,back) (DWORD)((((back) << 8) & 0xFF000000) | (fore))
  73 #endif
  74
  75 // apparently with MicroWindows it is possible that HDC is 0 so we have to
  76 // check for this ourselves
  77 #ifdef __WXMICROWIN__
  78     #define WXMICROWIN_CHECK_HDC if ( !GetHDC() ) return;
  79     #define WXMICROWIN_CHECK_HDC_RET(x) if ( !GetHDC() ) return x;
  80 #else
  81     #define WXMICROWIN_CHECK_HDC
  82     #define WXMICROWIN_CHECK_HDC_RET(x)
  83 #endif
  84
  85 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  86
  87 // ---------------------------------------------------------------------------
  88 // constants
  89 // ---------------------------------------------------------------------------
  90
  91 static const int VIEWPORT_EXTENT = 1000;
  92
  93 static const int MM_POINTS = 9;
  94 static const int MM_METRIC = 10;
  95
  96 // ROPs which don't have standard names (see "Ternary Raster Operations" in the
  97 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
  98 #define DSTCOPY 0x00AA0029      // a.k.a. NOP operation
  99
 100 // ----------------------------------------------------------------------------
 101 // macros for logical <-> device coords conversion
 102 // ----------------------------------------------------------------------------
 103
 104 /*
 105    We currently let Windows do all the translations itself so these macros are
 106    not really needed (any more) but keep them to enhance readability of the
 107    code by allowing to see where are the logical and where are the device
 108    coordinates used.
 109  */
 110
 111 #ifdef __WXWINCE__
 112     #define XLOG2DEV(x) ((x-m_logicalOriginX)*m_signX+m_deviceOriginX)
 113     #define YLOG2DEV(y) ((y-m_logicalOriginY)*m_signY+m_deviceOriginY)
 114     #define XDEV2LOG(x) ((x-m_deviceOriginX)*m_signX+m_logicalOriginX)
 115     #define YDEV2LOG(y) ((y-m_deviceOriginY)*m_signY+m_logicalOriginY)
 116 #else
 117     #define XLOG2DEV(x) (x)
 118     #define YLOG2DEV(y) (y)
 119     #define XDEV2LOG(x) (x)
 120     #define YDEV2LOG(y) (y)
 121 #endif
 122
 123 // ---------------------------------------------------------------------------
 124 // private functions
 125 // ---------------------------------------------------------------------------
 126
 127 // convert degrees to radians
 128 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
 129
 130 // call AlphaBlend() to blit contents of hdcSrc to hdcDst using alpha
 131 //
 132 // NB: bmpSrc is the bitmap selected in hdcSrc, it is not really needed
 133 //     to pass it to this function but as we already have it at the point
 134 //     of call anyhow we do
 135 //
 136 // return true if we could draw the bitmap in one way or the other, false
 137 // otherwise
 138 static bool AlphaBlt(HDC hdcDst,
 139                      int x, int y, int w, int h,
 140                      HDC hdcSrc,
 141                      const wxBitmap& bmpSrc);
 142
 143 #ifdef wxHAVE_RAW_BITMAP
 144 // our (limited) AlphaBlend() replacement
 145 static void
 146 wxAlphaBlend(HDC hdcDst, int x, int y, int w, int h, const wxBitmap& bmp);
 147 #endif
 148
 149 // ----------------------------------------------------------------------------
 150 // private classes
 151 // ----------------------------------------------------------------------------
 152
 153 // instead of duplicating the same code which sets and then restores text
 154 // colours in each wxDC method working with wxSTIPPLE_MASK_OPAQUE brushes,
 155 // encapsulate this in a small helper class
 156
 157 // wxColourChanger: changes the text colours in the ctor if required and
 158 //                  restores them in the dtor
 159 class wxColourChanger
 160 {
 161 public:
 162     wxColourChanger(wxDC& dc);
 163    ~wxColourChanger();
 164
 165 private:
 166     wxDC& m_dc;
 167
 168     COLORREF m_colFgOld, m_colBgOld;
 169
 170     bool m_changed;
 171
 172     DECLARE_NO_COPY_CLASS(wxColourChanger)
 173 };
 174
 175 // this class saves the old stretch blit mode during its life time
 176 class StretchBltModeChanger
 177 {
 178 public:
 179     StretchBltModeChanger(HDC hdc, int mode)
 180         : m_hdc(hdc)
 181     {
 182 #ifndef __WXWINCE__
 183         m_modeOld = ::SetStretchBltMode(m_hdc, mode);
 184         if ( !m_modeOld )
 185             wxLogLastError(_T("SetStretchBltMode"));
 186 #else
 187         wxUnusedVar(mode);
 188 #endif
 189     }
 190
 191     ~StretchBltModeChanger()
 192     {
 193 #ifndef __WXWINCE__
 194         if ( !::SetStretchBltMode(m_hdc, m_modeOld) )
 195             wxLogLastError(_T("SetStretchBltMode"));
 196 #endif
 197     }
 198
 199 private:
 200     const HDC m_hdc;
 201
 202     int m_modeOld;
 203
 204     DECLARE_NO_COPY_CLASS(StretchBltModeChanger)
 205 };
 206
 207 // ===========================================================================
 208 // implementation
 209 // ===========================================================================
 210
 211 // ----------------------------------------------------------------------------
 212 // wxColourChanger
 213 // ----------------------------------------------------------------------------
 214
 215 wxColourChanger::wxColourChanger(wxDC& dc) : m_dc(dc)
 216 {
 217     const wxBrush& brush = dc.GetBrush();
 218     if ( brush.Ok() && brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
 219     {
 220         HDC hdc = GetHdcOf(dc);
 221         m_colFgOld = ::GetTextColor(hdc);
 222         m_colBgOld = ::GetBkColor(hdc);
 223
 224         // note that Windows convention is opposite to wxWidgets one, this is
 225         // why text colour becomes the background one and vice versa
 226         const wxColour& colFg = dc.GetTextForeground();
 227         if ( colFg.Ok() )
 228         {
 229             ::SetBkColor(hdc, colFg.GetPixel());
 230         }
 231
 232         const wxColour& colBg = dc.GetTextBackground();
 233         if ( colBg.Ok() )
 234         {
 235             ::SetTextColor(hdc, colBg.GetPixel());
 236         }
 237
 238         SetBkMode(hdc,
 239                   dc.GetBackgroundMode() == wxTRANSPARENT ? TRANSPARENT
 240                                                           : OPAQUE);
 241
 242         // flag which telsl us to undo changes in the dtor
 243         m_changed = true;
 244     }
 245     else
 246     {
 247         // nothing done, nothing to undo
 248         m_changed = false;
 249     }
 250 }
 251
 252 wxColourChanger::~wxColourChanger()
 253 {
 254     if ( m_changed )
 255     {
 256         // restore the colours we changed
 257         HDC hdc = GetHdcOf(m_dc);
 258
 259         ::SetBkMode(hdc, TRANSPARENT);
 260         ::SetTextColor(hdc, m_colFgOld);
 261         ::SetBkColor(hdc, m_colBgOld);
 262     }
 263 }
 264
 265 // ---------------------------------------------------------------------------
 266 // wxDC
 267 // ---------------------------------------------------------------------------
 268
 269 // Default constructor
 270 wxDC::wxDC()
 271 {
 272     m_canvas = NULL;
 273
 274     m_oldBitmap = 0;
 275     m_oldPen = 0;
 276     m_oldBrush = 0;
 277     m_oldFont = 0;
 278 #if wxUSE_PALETTE
 279     m_oldPalette = 0;
 280 #endif // wxUSE_PALETTE
 281
 282     m_bOwnsDC = false;
 283     m_hDC = 0;
 284 }
 285
 286 wxDC::~wxDC()
 287 {
 288     if ( m_hDC != 0 )
 289     {
 290         SelectOldObjects(m_hDC);
 291
 292         // if we own the HDC, we delete it, otherwise we just release it
 293
 294         if ( m_bOwnsDC )
 295         {
 296             ::DeleteDC(GetHdc());
 297         }
 298         else // we don't own our HDC
 299         {
 300             if (m_canvas)
 301             {
 302                 ::ReleaseDC(GetHwndOf(m_canvas), GetHdc());
 303             }
 304             else
 305             {
 306                 // Must have been a wxScreenDC
 307                 ::ReleaseDC((HWND) NULL, GetHdc());
 308             }
 309         }
 310     }
 311 }
 312
 313 // This will select current objects out of the DC,
 314 // which is what you have to do before deleting the
 315 // DC.
 316 void wxDC::SelectOldObjects(WXHDC dc)
 317 {
 318     if (dc)
 319     {
 320         if (m_oldBitmap)
 321         {
 322             ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
 323 #ifdef __WXDEBUG__
 324             if (m_selectedBitmap.Ok())
 325             {
 326                 m_selectedBitmap.SetSelectedInto(NULL);
 327             }
 328 #endif
 329         }
 330         m_oldBitmap = 0;
 331         if (m_oldPen)
 332         {
 333             ::SelectObject((HDC) dc, (HPEN) m_oldPen);
 334         }
 335         m_oldPen = 0;
 336         if (m_oldBrush)
 337         {
 338             ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
 339         }
 340         m_oldBrush = 0;
 341         if (m_oldFont)
 342         {
 343             ::SelectObject((HDC) dc, (HFONT) m_oldFont);
 344         }
 345         m_oldFont = 0;
 346
 347 #if wxUSE_PALETTE
 348         if (m_oldPalette)
 349         {
 350             ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, FALSE);
 351         }
 352         m_oldPalette = 0;
 353 #endif // wxUSE_PALETTE
 354     }
 355
 356     m_brush = wxNullBrush;
 357     m_pen = wxNullPen;
 358 #if wxUSE_PALETTE
 359     m_palette = wxNullPalette;
 360 #endif // wxUSE_PALETTE
 361     m_font = wxNullFont;
 362     m_backgroundBrush = wxNullBrush;
 363     m_selectedBitmap = wxNullBitmap;
 364 }
 365
 366 // ---------------------------------------------------------------------------
 367 // clipping
 368 // ---------------------------------------------------------------------------
 369
 370 void wxDC::UpdateClipBox()
 371 {
 372     WXMICROWIN_CHECK_HDC
 373
 374     RECT rect;
 375     ::GetClipBox(GetHdc(), &rect);
 376
 377     m_clipX1 = (wxCoord) XDEV2LOG(rect.left);
 378     m_clipY1 = (wxCoord) YDEV2LOG(rect.top);
 379     m_clipX2 = (wxCoord) XDEV2LOG(rect.right);
 380     m_clipY2 = (wxCoord) YDEV2LOG(rect.bottom);
 381 }
 382
 383 void
 384 wxDC::DoGetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
 385 {
 386     // check if we should try to retrieve the clipping region possibly not set
 387     // by our SetClippingRegion() but preset by Windows:this can only happen
 388     // when we're associated with an existing HDC usign SetHDC(), see there
 389     if ( m_clipping && !m_clipX1 && !m_clipX2 )
 390     {
 391         wxDC *self = wxConstCast(this, wxDC);
 392         self->UpdateClipBox();
 393
 394         if ( !m_clipX1 && !m_clipX2 )
 395             self->m_clipping = false;
 396     }
 397
 398     wxDCBase::DoGetClippingBox(x, y, w, h);
 399 }
 400
 401 // common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
 402 void wxDC::SetClippingHrgn(WXHRGN hrgn)
 403 {
 404     wxCHECK_RET( hrgn, wxT("invalid clipping region") );
 405
 406     WXMICROWIN_CHECK_HDC
 407
 408     // note that we combine the new clipping region with the existing one: this
 409     // is compatible with what the other ports do and is the documented
 410     // behaviour now (starting with 2.3.3)
 411 #if defined(__WXWINCE__)
 412     RECT rectClip;
 413     if ( !::GetClipBox(GetHdc(), &rectClip) )
 414         return;
 415
 416     HRGN hrgnDest = ::CreateRectRgn(0, 0, 0, 0);
 417     HRGN hrgnClipOld = ::CreateRectRgn(rectClip.left, rectClip.top,
 418                                        rectClip.right, rectClip.bottom);
 419
 420     if ( ::CombineRgn(hrgnDest, hrgnClipOld, (HRGN)hrgn, RGN_AND) != ERROR )
 421     {
 422         ::SelectClipRgn(GetHdc(), hrgnDest);
 423     }
 424
 425     ::DeleteObject(hrgnClipOld);
 426     ::DeleteObject(hrgnDest);
 427 #else // !WinCE
 428     if ( ::ExtSelectClipRgn(GetHdc(), (HRGN)hrgn, RGN_AND) == ERROR )
 429     {
 430         wxLogLastError(_T("ExtSelectClipRgn"));
 431
 432         return;
 433     }
 434 #endif // WinCE/!WinCE
 435
 436     m_clipping = true;
 437
 438     UpdateClipBox();
 439 }
 440
 441 void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 442 {
 443     // the region coords are always the device ones, so do the translation
 444     // manually
 445     //
 446     // FIXME: possible +/-1 error here, to check!
 447     HRGN hrgn = ::CreateRectRgn(LogicalToDeviceX(x),
 448                                 LogicalToDeviceY(y),
 449                                 LogicalToDeviceX(x + w),
 450                                 LogicalToDeviceY(y + h));
 451     if ( !hrgn )
 452     {
 453         wxLogLastError(_T("CreateRectRgn"));
 454     }
 455     else
 456     {
 457         SetClippingHrgn((WXHRGN)hrgn);
 458
 459         ::DeleteObject(hrgn);
 460     }
 461 }
 462
 463 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 464 {
 465     SetClippingHrgn(region.GetHRGN());
 466 }
 467
 468 void wxDC::DestroyClippingRegion()
 469 {
 470     WXMICROWIN_CHECK_HDC
 471
 472     if (m_clipping && m_hDC)
 473     {
 474         // TODO: this should restore the previous clipping region,
 475         //       so that OnPaint processing works correctly, and the update
 476         //       clipping region doesn't get destroyed after the first
 477         //       DestroyClippingRegion.
 478         HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
 479         ::SelectClipRgn(GetHdc(), rgn);
 480         ::DeleteObject(rgn);
 481     }
 482
 483     wxDCBase::DestroyClippingRegion();
 484 }
 485
 486 // ---------------------------------------------------------------------------
 487 // query capabilities
 488 // ---------------------------------------------------------------------------
 489
 490 bool wxDC::CanDrawBitmap() const
 491 {
 492     return true;
 493 }
 494
 495 bool wxDC::CanGetTextExtent() const
 496 {
 497 #ifdef __WXMICROWIN__
 498     // TODO Extend MicroWindows' GetDeviceCaps function
 499     return true;
 500 #else
 501     // What sort of display is it?
 502     int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
 503
 504     return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
 505 #endif
 506 }
 507
 508 int wxDC::GetDepth() const
 509 {
 510     WXMICROWIN_CHECK_HDC_RET(16)
 511
 512     return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
 513 }
 514
 515 // ---------------------------------------------------------------------------
 516 // drawing
 517 // ---------------------------------------------------------------------------
 518
 519 void wxDC::Clear()
 520 {
 521     WXMICROWIN_CHECK_HDC
 522
 523     RECT rect;
 524     if ( m_canvas )
 525     {
 526         GetClientRect((HWND) m_canvas->GetHWND(), &rect);
 527     }
 528     else
 529     {
 530         // No, I think we should simply ignore this if printing on e.g.
 531         // a printer DC.
 532         // wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
 533         if (!m_selectedBitmap.Ok())
 534             return;
 535
 536         rect.left = 0; rect.top = 0;
 537         rect.right = m_selectedBitmap.GetWidth();
 538         rect.bottom = m_selectedBitmap.GetHeight();
 539     }
 540
 541 #ifndef __WXWINCE__
 542     (void) ::SetMapMode(GetHdc(), MM_TEXT);
 543 #endif
 544
 545     DWORD colour = ::GetBkColor(GetHdc());
 546     HBRUSH brush = ::CreateSolidBrush(colour);
 547     ::FillRect(GetHdc(), &rect, brush);
 548     ::DeleteObject(brush);
 549
 550 #ifndef __WXWINCE__
 551     int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX,
 552         height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY;
 553
 554     ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
 555
 556     ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
 557     ::SetWindowExtEx(GetHdc(), width, height, NULL);
 558     ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
 559     ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
 560 #endif
 561 }
 562
 563 bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
 564 {
 565 #ifdef __WXWINCE__
 566     wxUnusedVar(x);
 567     wxUnusedVar(y);
 568     wxUnusedVar(col);
 569     wxUnusedVar(style);
 570     return false;
 571 #else
 572
 573     WXMICROWIN_CHECK_HDC_RET(false)
 574
 575     bool success = (0 != ::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
 576                          col.GetPixel(),
 577                          style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
 578                                                   : FLOODFILLBORDER) ) ;
 579     if (!success)
 580     {
 581         // quoting from the MSDN docs:
 582         //
 583         //      Following are some of the reasons this function might fail:
 584         //
 585         //      * The filling could not be completed.
 586         //      * The specified point has the boundary color specified by the
 587         //        crColor parameter (if FLOODFILLBORDER was requested).
 588         //      * The specified point does not have the color specified by
 589         //        crColor (if FLOODFILLSURFACE was requested)
 590         //      * The point is outside the clipping region that is, it is not
 591         //        visible on the device.
 592         //
 593         wxLogLastError(wxT("ExtFloodFill"));
 594     }
 595
 596     CalcBoundingBox(x, y);
 597
 598     return success;
 599 #endif
 600 }
 601
 602 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 603 {
 604     WXMICROWIN_CHECK_HDC_RET(false)
 605
 606     wxCHECK_MSG( col, false, _T("NULL colour parameter in wxDC::GetPixel") );
 607
 608     // get the color of the pixel
 609     COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
 610
 611     wxRGBToColour(*col, pixelcolor);
 612
 613     return true;
 614 }
 615
 616 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 617 {
 618     WXMICROWIN_CHECK_HDC
 619
 620     wxCoord x1 = x-VIEWPORT_EXTENT;
 621     wxCoord y1 = y-VIEWPORT_EXTENT;
 622     wxCoord x2 = x+VIEWPORT_EXTENT;
 623     wxCoord y2 = y+VIEWPORT_EXTENT;
 624
 625     wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y));
 626     wxDrawLine(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), XLOG2DEV(x), YLOG2DEV(y2));
 627
 628     CalcBoundingBox(x1, y1);
 629     CalcBoundingBox(x2, y2);
 630 }
 631
 632 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 633 {
 634     WXMICROWIN_CHECK_HDC
 635
 636     wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2));
 637
 638     CalcBoundingBox(x1, y1);
 639     CalcBoundingBox(x2, y2);
 640 }
 641
 642 // Draws an arc of a circle, centred on (xc, yc), with starting point (x1, y1)
 643 // and ending at (x2, y2)
 644 void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
 645                      wxCoord x2, wxCoord y2,
 646                      wxCoord xc, wxCoord yc)
 647 {
 648 #ifdef __WXWINCE__
 649     // Slower emulation since WinCE doesn't support Pie and Arc
 650     double r = sqrt( (x1-xc)*(x1-xc) + (y1-yc)*(y1-yc) );
 651     double sa = acos((x1-xc)/r)/M_PI*180; // between 0 and 180
 652     if( y1>yc ) sa = -sa; // below center
 653     double ea = atan2(yc-y2, x2-xc)/M_PI*180;
 654     DoDrawEllipticArcRot( xc-r, yc-r, 2*r, 2*r, sa, ea );
 655 #else
 656
 657     WXMICROWIN_CHECK_HDC
 658
 659     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 660
 661     double dx = xc - x1;
 662     double dy = yc - y1;
 663     double radius = (double)sqrt(dx*dx+dy*dy);
 664     wxCoord r = (wxCoord)radius;
 665
 666     // treat the special case of full circle separately
 667     if ( x1 == x2 && y1 == y2 )
 668     {
 669         DrawEllipse(xc - r, yc - r, 2*r, 2*r);
 670         return;
 671     }
 672
 673     wxCoord xx1 = XLOG2DEV(x1);
 674     wxCoord yy1 = YLOG2DEV(y1);
 675     wxCoord xx2 = XLOG2DEV(x2);
 676     wxCoord yy2 = YLOG2DEV(y2);
 677     wxCoord xxc = XLOG2DEV(xc);
 678     wxCoord yyc = YLOG2DEV(yc);
 679     wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
 680
 681     wxCoord xxx1 = (wxCoord) (xxc-ray);
 682     wxCoord yyy1 = (wxCoord) (yyc-ray);
 683     wxCoord xxx2 = (wxCoord) (xxc+ray);
 684     wxCoord yyy2 = (wxCoord) (yyc+ray);
 685
 686     if ( m_brush.Ok() && m_brush.GetStyle() != wxTRANSPARENT )
 687     {
 688         // Have to add 1 to bottom-right corner of rectangle
 689         // to make semi-circles look right (crooked line otherwise).
 690         // Unfortunately this is not a reliable method, depends
 691         // on the size of shape.
 692         // TODO: figure out why this happens!
 693         Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1, xx1,yy1,xx2,yy2);
 694     }
 695     else
 696     {
 697         Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2, xx1,yy1,xx2,yy2);
 698     }
 699
 700     CalcBoundingBox(xc - r, yc - r);
 701     CalcBoundingBox(xc + r, yc + r);
 702 #endif
 703 }
 704
 705 void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
 706                            wxCoord width, wxCoord height)
 707 {
 708     WXMICROWIN_CHECK_HDC
 709
 710     wxCoord x2 = x1 + width,
 711             y2 = y1 + height;
 712
 713 #if defined(__WIN32__) && !defined(__SYMANTEC__) && !defined(__WXMICROWIN__)
 714     RECT rect;
 715     rect.left   = x1;
 716     rect.top    = y1;
 717     rect.right  = x2;
 718     rect.bottom = y2;
 719
 720 #ifdef __WXWINCE__
 721     DrawFrameControl(GetHdc(), &rect, DFC_BUTTON, DFCS_BUTTONCHECK);
 722 #else
 723     DrawFrameControl(GetHdc(), &rect, DFC_MENU, DFCS_MENUCHECK);
 724 #endif
 725 #else // Symantec-MicroWin
 726     // draw a cross
 727     HPEN blackPen = ::CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
 728     HPEN whiteBrush = (HPEN)::GetStockObject(WHITE_BRUSH);
 729     HPEN hPenOld = (HPEN)::SelectObject(GetHdc(), blackPen);
 730     HPEN hBrushOld = (HPEN)::SelectObject(GetHdc(), whiteBrush);
 731     ::SetROP2(GetHdc(), R2_COPYPEN);
 732     Rectangle(GetHdc(), x1, y1, x2, y2);
 733     MoveToEx(GetHdc(), x1, y1, NULL);
 734     LineTo(GetHdc(), x2, y2);
 735     MoveToEx(GetHdc(), x2, y1, NULL);
 736     LineTo(GetHdc(), x1, y2);
 737     ::SelectObject(GetHdc(), hPenOld);
 738     ::SelectObject(GetHdc(), hBrushOld);
 739     ::DeleteObject(blackPen);
 740 #endif // Win32/Symantec-MicroWin
 741
 742     CalcBoundingBox(x1, y1);
 743     CalcBoundingBox(x2, y2);
 744 }
 745
 746 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 747 {
 748     WXMICROWIN_CHECK_HDC
 749
 750     COLORREF color = 0x00ffffff;
 751     if (m_pen.Ok())
 752     {
 753         color = m_pen.GetColour().GetPixel();
 754     }
 755
 756     SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
 757
 758     CalcBoundingBox(x, y);
 759 }
 760
 761 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
 762 {
 763     WXMICROWIN_CHECK_HDC
 764
 765     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 766
 767     // Do things less efficiently if we have offsets
 768     if (xoffset != 0 || yoffset != 0)
 769     {
 770         POINT *cpoints = new POINT[n];
 771         int i;
 772         for (i = 0; i < n; i++)
 773         {
 774             cpoints[i].x = (int)(points[i].x + xoffset);
 775             cpoints[i].y = (int)(points[i].y + yoffset);
 776
 777             CalcBoundingBox(cpoints[i].x, cpoints[i].y);
 778         }
 779 #ifndef __WXWINCE__
 780         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
 781 #else
 782         wxUnusedVar(fillStyle);
 783 #endif
 784         (void)Polygon(GetHdc(), cpoints, n);
 785 #ifndef __WXWINCE__
 786         SetPolyFillMode(GetHdc(),prev);
 787 #endif
 788         delete[] cpoints;
 789     }
 790     else
 791     {
 792         int i;
 793         for (i = 0; i < n; i++)
 794             CalcBoundingBox(points[i].x, points[i].y);
 795
 796 #ifndef __WXWINCE__
 797         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
 798 #endif
 799         (void)Polygon(GetHdc(), (POINT*) points, n);
 800 #ifndef __WXWINCE__
 801         SetPolyFillMode(GetHdc(),prev);
 802 #endif
 803     }
 804 }
 805
 806 void
 807 wxDC::DoDrawPolyPolygon(int n,
 808                         int count[],
 809                         wxPoint points[],
 810                         wxCoord xoffset,
 811                         wxCoord yoffset,
 812                         int fillStyle)
 813 {
 814 #ifdef __WXWINCE__
 815     wxDCBase::DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle);
 816 #else
 817     WXMICROWIN_CHECK_HDC
 818
 819     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 820     int i, cnt;
 821     for (i = cnt = 0; i < n; i++)
 822         cnt += count[i];
 823
 824     // Do things less efficiently if we have offsets
 825     if (xoffset != 0 || yoffset != 0)
 826     {
 827         POINT *cpoints = new POINT[cnt];
 828         for (i = 0; i < cnt; i++)
 829         {
 830             cpoints[i].x = (int)(points[i].x + xoffset);
 831             cpoints[i].y = (int)(points[i].y + yoffset);
 832
 833             CalcBoundingBox(cpoints[i].x, cpoints[i].y);
 834         }
 835 #ifndef __WXWINCE__
 836         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
 837 #endif
 838         (void)PolyPolygon(GetHdc(), cpoints, count, n);
 839 #ifndef __WXWINCE__
 840         SetPolyFillMode(GetHdc(),prev);
 841 #endif
 842         delete[] cpoints;
 843     }
 844     else
 845     {
 846         for (i = 0; i < cnt; i++)
 847             CalcBoundingBox(points[i].x, points[i].y);
 848
 849 #ifndef __WXWINCE__
 850         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
 851 #endif
 852         (void)PolyPolygon(GetHdc(), (POINT*) points, count, n);
 853 #ifndef __WXWINCE__
 854         SetPolyFillMode(GetHdc(),prev);
 855 #endif
 856     }
 857 #endif
 858   // __WXWINCE__
 859 }
 860
 861 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
 862 {
 863     WXMICROWIN_CHECK_HDC
 864
 865     // Do things less efficiently if we have offsets
 866     if (xoffset != 0 || yoffset != 0)
 867     {
 868         POINT *cpoints = new POINT[n];
 869         int i;
 870         for (i = 0; i < n; i++)
 871         {
 872             cpoints[i].x = (int)(points[i].x + xoffset);
 873             cpoints[i].y = (int)(points[i].y + yoffset);
 874
 875             CalcBoundingBox(cpoints[i].x, cpoints[i].y);
 876         }
 877         (void)Polyline(GetHdc(), cpoints, n);
 878         delete[] cpoints;
 879     }
 880     else
 881     {
 882         int i;
 883         for (i = 0; i < n; i++)
 884             CalcBoundingBox(points[i].x, points[i].y);
 885
 886         (void)Polyline(GetHdc(), (POINT*) points, n);
 887     }
 888 }
 889
 890 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 891 {
 892     WXMICROWIN_CHECK_HDC
 893
 894     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 895
 896     wxCoord x2 = x + width;
 897     wxCoord y2 = y + height;
 898
 899     if ((m_logicalFunction == wxCOPY) && (m_pen.GetStyle() == wxTRANSPARENT))
 900     {
 901         RECT rect;
 902         rect.left = XLOG2DEV(x);
 903         rect.top = YLOG2DEV(y);
 904         rect.right = XLOG2DEV(x2);
 905         rect.bottom = YLOG2DEV(y2);
 906         (void)FillRect(GetHdc(), &rect, (HBRUSH)m_brush.GetResourceHandle() );
 907     }
 908     else
 909     {
 910         // Windows draws the filled rectangles without outline (i.e. drawn with a
 911         // transparent pen) one pixel smaller in both directions and we want them
 912         // to have the same size regardless of which pen is used - adjust
 913
 914         // I wonder if this shouldn´t be done after the LOG2DEV() conversions. RR.
 915         if ( m_pen.GetStyle() == wxTRANSPARENT )
 916         {
 917             x2++;
 918             y2++;
 919         }
 920
 921         (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
 922     }
 923
 924
 925     CalcBoundingBox(x, y);
 926     CalcBoundingBox(x2, y2);
 927 }
 928
 929 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 930 {
 931     WXMICROWIN_CHECK_HDC
 932
 933     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 934
 935     // Now, a negative radius value is interpreted to mean
 936     // 'the proportion of the smallest X or Y dimension'
 937
 938     if (radius < 0.0)
 939     {
 940         double smallest = (width < height) ? width : height;
 941         radius = (- radius * smallest);
 942     }
 943
 944     wxCoord x2 = (x+width);
 945     wxCoord y2 = (y+height);
 946
 947     // Windows draws the filled rectangles without outline (i.e. drawn with a
 948     // transparent pen) one pixel smaller in both directions and we want them
 949     // to have the same size regardless of which pen is used - adjust
 950     if ( m_pen.GetStyle() == wxTRANSPARENT )
 951     {
 952         x2++;
 953         y2++;
 954     }
 955
 956     (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
 957         YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
 958
 959     CalcBoundingBox(x, y);
 960     CalcBoundingBox(x2, y2);
 961 }
 962
 963 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 964 {
 965     WXMICROWIN_CHECK_HDC
 966
 967     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 968
 969     wxCoord x2 = (x+width);
 970     wxCoord y2 = (y+height);
 971
 972     (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
 973
 974     CalcBoundingBox(x, y);
 975     CalcBoundingBox(x2, y2);
 976 }
 977
 978 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
 979 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
 980 {
 981 #ifdef __WXWINCE__
 982     DoDrawEllipticArcRot( x, y, w, h, sa, ea );
 983 #else
 984
 985     WXMICROWIN_CHECK_HDC
 986
 987     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 988
 989     wxCoord x2 = x + w;
 990     wxCoord y2 = y + h;
 991
 992     int rx1 = XLOG2DEV(x+w/2);
 993     int ry1 = YLOG2DEV(y+h/2);
 994     int rx2 = rx1;
 995     int ry2 = ry1;
 996
 997     sa = DegToRad(sa);
 998     ea = DegToRad(ea);
 999
1000     rx1 += (int)(100.0 * abs(w) * cos(sa));
1001     ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
1002     rx2 += (int)(100.0 * abs(w) * cos(ea));
1003     ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
1004
1005     // draw pie with NULL_PEN first and then outline otherwise a line is
1006     // drawn from the start and end points to the centre
1007     HPEN hpenOld = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
1008     if (m_signY > 0)
1009     {
1010         (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
1011                   rx1, ry1, rx2, ry2);
1012     }
1013     else
1014     {
1015         (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
1016                   rx1, ry1-1, rx2, ry2-1);
1017     }
1018
1019     ::SelectObject(GetHdc(), hpenOld);
1020
1021     (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
1022               rx1, ry1, rx2, ry2);
1023
1024     CalcBoundingBox(x, y);
1025     CalcBoundingBox(x2, y2);
1026 #endif
1027 }
1028
1029 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
1030 {
1031     WXMICROWIN_CHECK_HDC
1032
1033     wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
1034
1035 #ifdef __WIN32__
1036     ::DrawIconEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon), icon.GetWidth(), icon.GetHeight(), 0, NULL, DI_NORMAL);
1037 #else
1038     ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon));
1039 #endif
1040
1041     CalcBoundingBox(x, y);
1042     CalcBoundingBox(x + icon.GetWidth(), y + icon.GetHeight());
1043 }
1044
1045 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
1046 {
1047     WXMICROWIN_CHECK_HDC
1048
1049     wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
1050
1051     int width = bmp.GetWidth(),
1052         height = bmp.GetHeight();
1053
1054     HBITMAP hbmpMask = 0;
1055
1056 #if wxUSE_PALETTE
1057     HPALETTE oldPal = 0;
1058 #endif // wxUSE_PALETTE
1059
1060     if ( bmp.HasAlpha() )
1061     {
1062         MemoryHDC hdcMem;
1063         SelectInHDC select(hdcMem, GetHbitmapOf(bmp));
1064
1065         if ( AlphaBlt(GetHdc(), x, y, width, height, hdcMem, bmp) )
1066             return;
1067     }
1068
1069     if ( useMask )
1070     {
1071         wxMask *mask = bmp.GetMask();
1072         if ( mask )
1073             hbmpMask = (HBITMAP)mask->GetMaskBitmap();
1074
1075         if ( !hbmpMask )
1076         {
1077             // don't give assert here because this would break existing
1078             // programs - just silently ignore useMask parameter
1079             useMask = false;
1080         }
1081     }
1082     if ( useMask )
1083     {
1084 #ifdef __WIN32__
1085         // use MaskBlt() with ROP which doesn't do anything to dst in the mask
1086         // points
1087         // On some systems, MaskBlt succeeds yet is much much slower
1088         // than the wxWidgets fall-back implementation. So we need
1089         // to be able to switch this on and off at runtime.
1090         bool ok = false;
1091 #if wxUSE_SYSTEM_OPTIONS
1092         if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
1093 #endif
1094         {
1095             HDC cdc = GetHdc();
1096             HDC hdcMem = ::CreateCompatibleDC(GetHdc());
1097             HGDIOBJ hOldBitmap = ::SelectObject(hdcMem, GetHbitmapOf(bmp));
1098 #if wxUSE_PALETTE
1099             wxPalette *pal = bmp.GetPalette();
1100             if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
1101             {
1102                 oldPal = ::SelectPalette(hdcMem, GetHpaletteOf(*pal), FALSE);
1103                 ::RealizePalette(hdcMem);
1104             }
1105 #endif // wxUSE_PALETTE
1106
1107             ok = ::MaskBlt(cdc, x, y, width, height,
1108                             hdcMem, 0, 0,
1109                             hbmpMask, 0, 0,
1110                             MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
1111
1112 #if wxUSE_PALETTE
1113             if (oldPal)
1114                 ::SelectPalette(hdcMem, oldPal, FALSE);
1115 #endif // wxUSE_PALETTE
1116
1117             ::SelectObject(hdcMem, hOldBitmap);
1118             ::DeleteDC(hdcMem);
1119         }
1120
1121         if ( !ok )
1122 #endif // Win32
1123         {
1124             // Rather than reproduce wxDC::Blit, let's do it at the wxWin API
1125             // level
1126             wxMemoryDC memDC;
1127             memDC.SelectObject(bmp);
1128
1129             Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
1130
1131             memDC.SelectObject(wxNullBitmap);
1132         }
1133     }
1134     else // no mask, just use BitBlt()
1135     {
1136         HDC cdc = GetHdc();
1137         HDC memdc = ::CreateCompatibleDC( cdc );
1138         HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
1139
1140         wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
1141
1142         COLORREF old_textground = ::GetTextColor(GetHdc());
1143         COLORREF old_background = ::GetBkColor(GetHdc());
1144         if (m_textForegroundColour.Ok())
1145         {
1146             ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1147         }
1148         if (m_textBackgroundColour.Ok())
1149         {
1150             ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1151         }
1152
1153 #if wxUSE_PALETTE
1154         wxPalette *pal = bmp.GetPalette();
1155         if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
1156         {
1157             oldPal = ::SelectPalette(memdc, GetHpaletteOf(*pal), FALSE);
1158             ::RealizePalette(memdc);
1159         }
1160 #endif // wxUSE_PALETTE
1161
1162         HGDIOBJ hOldBitmap = ::SelectObject( memdc, hbitmap );
1163         ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
1164
1165 #if wxUSE_PALETTE
1166         if (oldPal)
1167             ::SelectPalette(memdc, oldPal, FALSE);
1168 #endif // wxUSE_PALETTE
1169
1170         ::SelectObject( memdc, hOldBitmap );
1171         ::DeleteDC( memdc );
1172
1173         ::SetTextColor(GetHdc(), old_textground);
1174         ::SetBkColor(GetHdc(), old_background);
1175     }
1176 }
1177
1178 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
1179 {
1180     WXMICROWIN_CHECK_HDC
1181
1182     DrawAnyText(text, x, y);
1183
1184     // update the bounding box
1185     CalcBoundingBox(x, y);
1186
1187     wxCoord w, h;
1188     GetTextExtent(text, &w, &h);
1189     CalcBoundingBox(x + w, y + h);
1190 }
1191
1192 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
1193 {
1194     WXMICROWIN_CHECK_HDC
1195
1196     // prepare for drawing the text
1197     if ( m_textForegroundColour.Ok() )
1198         SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
1199
1200     DWORD old_background = 0;
1201     if ( m_textBackgroundColour.Ok() )
1202     {
1203         old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1204     }
1205
1206     SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
1207                                                           : OPAQUE);
1208
1209 #ifdef __WXWINCE__
1210     if ( ::ExtTextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), 0, NULL,
1211                    text.c_str(), text.length(), NULL) == 0 )
1212     {
1213         wxLogLastError(wxT("TextOut"));
1214     }
1215 #else
1216     if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
1217                    text.c_str(), text.length()) == 0 )
1218     {
1219         wxLogLastError(wxT("TextOut"));
1220     }
1221 #endif
1222
1223     // restore the old parameters (text foreground colour may be left because
1224     // it never is set to anything else, but background should remain
1225     // transparent even if we just drew an opaque string)
1226     if ( m_textBackgroundColour.Ok() )
1227         (void)SetBkColor(GetHdc(), old_background);
1228
1229     SetBkMode(GetHdc(), TRANSPARENT);
1230 }
1231
1232 void wxDC::DoDrawRotatedText(const wxString& text,
1233                              wxCoord x, wxCoord y,
1234                              double angle)
1235 {
1236     WXMICROWIN_CHECK_HDC
1237
1238     // we test that we have some font because otherwise we should still use the
1239     // "else" part below to avoid that DrawRotatedText(angle = 180) and
1240     // DrawRotatedText(angle = 0) use different fonts (we can't use the default
1241     // font for drawing rotated fonts unfortunately)
1242     if ( (angle == 0.0) && m_font.Ok() )
1243     {
1244         DoDrawText(text, x, y);
1245     }
1246 #ifndef __WXMICROWIN__
1247     else
1248     {
1249         // NB: don't take DEFAULT_GUI_FONT (a.k.a. wxSYS_DEFAULT_GUI_FONT)
1250         //     because it's not TrueType and so can't have non zero
1251         //     orientation/escapement under Win9x
1252         wxFont font = m_font.Ok() ? m_font : *wxSWISS_FONT;
1253         HFONT hfont = (HFONT)font.GetResourceHandle();
1254         LOGFONT lf;
1255         if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
1256         {
1257             wxLogLastError(wxT("GetObject(hfont)"));
1258         }
1259
1260         // GDI wants the angle in tenth of degree
1261         long angle10 = (long)(angle * 10);
1262         lf.lfEscapement = angle10;
1263         lf. lfOrientation = angle10;
1264
1265         hfont = ::CreateFontIndirect(&lf);
1266         if ( !hfont )
1267         {
1268             wxLogLastError(wxT("CreateFont"));
1269         }
1270         else
1271         {
1272             HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
1273
1274             DrawAnyText(text, x, y);
1275
1276             (void)::SelectObject(GetHdc(), hfontOld);
1277             (void)::DeleteObject(hfont);
1278         }
1279
1280         // call the bounding box by adding all four vertices of the rectangle
1281         // containing the text to it (simpler and probably not slower than
1282         // determining which of them is really topmost/leftmost/...)
1283         wxCoord w, h;
1284         GetTextExtent(text, &w, &h);
1285
1286         double rad = DegToRad(angle);
1287
1288         // "upper left" and "upper right"
1289         CalcBoundingBox(x, y);
1290         CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
1291
1292         // "bottom left" and "bottom right"
1293         x += (wxCoord)(h*sin(rad));
1294         y += (wxCoord)(h*cos(rad));
1295         CalcBoundingBox(x, y);
1296         CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
1297     }
1298 #endif
1299 }
1300
1301 // ---------------------------------------------------------------------------
1302 // set GDI objects
1303 // ---------------------------------------------------------------------------
1304
1305 #if wxUSE_PALETTE
1306
1307 void wxDC::DoSelectPalette(bool realize)
1308 {
1309     WXMICROWIN_CHECK_HDC
1310
1311     // Set the old object temporarily, in case the assignment deletes an object
1312     // that's not yet selected out.
1313     if (m_oldPalette)
1314     {
1315         ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE);
1316         m_oldPalette = 0;
1317     }
1318
1319     if ( m_palette.Ok() )
1320     {
1321         HPALETTE oldPal = ::SelectPalette(GetHdc(),
1322                                           GetHpaletteOf(m_palette),
1323                                           false);
1324         if (!m_oldPalette)
1325             m_oldPalette = (WXHPALETTE) oldPal;
1326
1327         if (realize)
1328             ::RealizePalette(GetHdc());
1329     }
1330 }
1331
1332 void wxDC::SetPalette(const wxPalette& palette)
1333 {
1334     if ( palette.Ok() )
1335     {
1336         m_palette = palette;
1337         DoSelectPalette(true);
1338     }
1339 }
1340
1341 void wxDC::InitializePalette()
1342 {
1343     if ( wxDisplayDepth() <= 8 )
1344     {
1345         // look for any window or parent that has a custom palette. If any has
1346         // one then we need to use it in drawing operations
1347         wxWindow *win = m_canvas->GetAncestorWithCustomPalette();
1348
1349         m_hasCustomPalette = win && win->HasCustomPalette();
1350         if ( m_hasCustomPalette )
1351         {
1352             m_palette = win->GetPalette();
1353
1354             // turn on MSW translation for this palette
1355             DoSelectPalette();
1356         }
1357     }
1358 }
1359
1360 #endif // wxUSE_PALETTE
1361
1362 // SetFont/Pen/Brush() really ask to be implemented as a single template
1363 // function... but doing it is not worth breaking OpenWatcom build <sigh>
1364
1365 void wxDC::SetFont(const wxFont& font)
1366 {
1367     WXMICROWIN_CHECK_HDC
1368
1369     if ( font == m_font )
1370         return;
1371
1372     if ( font.Ok() )
1373     {
1374         HGDIOBJ hfont = ::SelectObject(GetHdc(), GetHfontOf(font));
1375         if ( hfont == HGDI_ERROR )
1376         {
1377             wxLogLastError(_T("SelectObject(font)"));
1378         }
1379         else // selected ok
1380         {
1381             if ( !m_oldFont )
1382                 m_oldFont = (WXHPEN)hfont;
1383
1384             m_font = font;
1385         }
1386     }
1387     else // invalid font, reset the current font
1388     {
1389         if ( m_oldFont )
1390         {
1391             if ( ::SelectObject(GetHdc(), (HPEN) m_oldFont) == HGDI_ERROR )
1392             {
1393                 wxLogLastError(_T("SelectObject(old font)"));
1394             }
1395
1396             m_oldFont = 0;
1397         }
1398
1399         m_font = wxNullFont;
1400     }
1401 }
1402
1403 void wxDC::SetPen(const wxPen& pen)
1404 {
1405     WXMICROWIN_CHECK_HDC
1406
1407     if ( pen == m_pen )
1408         return;
1409
1410     if ( pen.Ok() )
1411     {
1412         HGDIOBJ hpen = ::SelectObject(GetHdc(), GetHpenOf(pen));
1413         if ( hpen == HGDI_ERROR )
1414         {
1415             wxLogLastError(_T("SelectObject(pen)"));
1416         }
1417         else // selected ok
1418         {
1419             if ( !m_oldPen )
1420                 m_oldPen = (WXHPEN)hpen;
1421
1422             m_pen = pen;
1423         }
1424     }
1425     else // invalid pen, reset the current pen
1426     {
1427         if ( m_oldPen )
1428         {
1429             if ( ::SelectObject(GetHdc(), (HPEN) m_oldPen) == HGDI_ERROR )
1430             {
1431                 wxLogLastError(_T("SelectObject(old pen)"));
1432             }
1433
1434             m_oldPen = 0;
1435         }
1436
1437         m_pen = wxNullPen;
1438     }
1439 }
1440
1441 void wxDC::SetBrush(const wxBrush& brush)
1442 {
1443     WXMICROWIN_CHECK_HDC
1444
1445     if ( brush == m_brush )
1446         return;
1447
1448     if ( brush.Ok() )
1449     {
1450         // we must make sure the brush is aligned with the logical coordinates
1451         // before selecting it
1452         wxBitmap *stipple = brush.GetStipple();
1453         if ( stipple && stipple->Ok() )
1454         {
1455             if ( !::SetBrushOrgEx
1456                     (
1457                         GetHdc(),
1458                         m_deviceOriginX % stipple->GetWidth(),
1459                         m_deviceOriginY % stipple->GetHeight(),
1460                         NULL                    // [out] previous brush origin
1461                     ) )
1462             {
1463                 wxLogLastError(_T("SetBrushOrgEx()"));
1464             }
1465         }
1466
1467         HGDIOBJ hbrush = ::SelectObject(GetHdc(), GetHbrushOf(brush));
1468         if ( hbrush == HGDI_ERROR )
1469         {
1470             wxLogLastError(_T("SelectObject(brush)"));
1471         }
1472         else // selected ok
1473         {
1474             if ( !m_oldBrush )
1475                 m_oldBrush = (WXHPEN)hbrush;
1476
1477             m_brush = brush;
1478         }
1479     }
1480     else // invalid brush, reset the current brush
1481     {
1482         if ( m_oldBrush )
1483         {
1484             if ( ::SelectObject(GetHdc(), (HPEN) m_oldBrush) == HGDI_ERROR )
1485             {
1486                 wxLogLastError(_T("SelectObject(old brush)"));
1487             }
1488
1489             m_oldBrush = 0;
1490         }
1491
1492         m_brush = wxNullBrush;
1493     }
1494 }
1495
1496 void wxDC::SetBackground(const wxBrush& brush)
1497 {
1498     WXMICROWIN_CHECK_HDC
1499
1500     m_backgroundBrush = brush;
1501
1502     if ( m_backgroundBrush.Ok() )
1503     {
1504         (void)SetBkColor(GetHdc(), m_backgroundBrush.GetColour().GetPixel());
1505     }
1506 }
1507
1508 void wxDC::SetBackgroundMode(int mode)
1509 {
1510     WXMICROWIN_CHECK_HDC
1511
1512     m_backgroundMode = mode;
1513
1514     // SetBackgroundColour now only refers to text background
1515     // and m_backgroundMode is used there
1516 }
1517
1518 void wxDC::SetLogicalFunction(int function)
1519 {
1520     WXMICROWIN_CHECK_HDC
1521
1522     m_logicalFunction = function;
1523
1524     SetRop(m_hDC);
1525 }
1526
1527 void wxDC::SetRop(WXHDC dc)
1528 {
1529     if ( !dc || m_logicalFunction < 0 )
1530         return;
1531
1532     int rop;
1533
1534     switch (m_logicalFunction)
1535     {
1536         case wxCLEAR:        rop = R2_BLACK;         break;
1537         case wxXOR:          rop = R2_XORPEN;        break;
1538         case wxINVERT:       rop = R2_NOT;           break;
1539         case wxOR_REVERSE:   rop = R2_MERGEPENNOT;   break;
1540         case wxAND_REVERSE:  rop = R2_MASKPENNOT;    break;
1541         case wxCOPY:         rop = R2_COPYPEN;       break;
1542         case wxAND:          rop = R2_MASKPEN;       break;
1543         case wxAND_INVERT:   rop = R2_MASKNOTPEN;    break;
1544         case wxNO_OP:        rop = R2_NOP;           break;
1545         case wxNOR:          rop = R2_NOTMERGEPEN;   break;
1546         case wxEQUIV:        rop = R2_NOTXORPEN;     break;
1547         case wxSRC_INVERT:   rop = R2_NOTCOPYPEN;    break;
1548         case wxOR_INVERT:    rop = R2_MERGENOTPEN;   break;
1549         case wxNAND:         rop = R2_NOTMASKPEN;    break;
1550         case wxOR:           rop = R2_MERGEPEN;      break;
1551         case wxSET:          rop = R2_WHITE;         break;
1552
1553         default:
1554            wxFAIL_MSG( wxT("unsupported logical function") );
1555            return;
1556     }
1557
1558     SetROP2(GetHdc(), rop);
1559 }
1560
1561 bool wxDC::StartDoc(const wxString& WXUNUSED(message))
1562 {
1563     // We might be previewing, so return true to let it continue.
1564     return true;
1565 }
1566
1567 void wxDC::EndDoc()
1568 {
1569 }
1570
1571 void wxDC::StartPage()
1572 {
1573 }
1574
1575 void wxDC::EndPage()
1576 {
1577 }
1578
1579 // ---------------------------------------------------------------------------
1580 // text metrics
1581 // ---------------------------------------------------------------------------
1582
1583 wxCoord wxDC::GetCharHeight() const
1584 {
1585     WXMICROWIN_CHECK_HDC_RET(0)
1586
1587     TEXTMETRIC lpTextMetric;
1588
1589     GetTextMetrics(GetHdc(), &lpTextMetric);
1590
1591     return lpTextMetric.tmHeight;
1592 }
1593
1594 wxCoord wxDC::GetCharWidth() const
1595 {
1596     WXMICROWIN_CHECK_HDC_RET(0)
1597
1598     TEXTMETRIC lpTextMetric;
1599
1600     GetTextMetrics(GetHdc(), &lpTextMetric);
1601
1602     return lpTextMetric.tmAveCharWidth;
1603 }
1604
1605 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
1606                            wxCoord *descent, wxCoord *externalLeading,
1607                            wxFont *font) const
1608 {
1609 #ifdef __WXMICROWIN__
1610     if (!GetHDC())
1611     {
1612         if (x) *x = 0;
1613         if (y) *y = 0;
1614         if (descent) *descent = 0;
1615         if (externalLeading) *externalLeading = 0;
1616         return;
1617     }
1618 #endif // __WXMICROWIN__
1619
1620     HFONT hfontOld;
1621     if ( font )
1622     {
1623         wxASSERT_MSG( font->Ok(), _T("invalid font in wxDC::GetTextExtent") );
1624
1625         hfontOld = (HFONT)::SelectObject(GetHdc(), GetHfontOf(*font));
1626     }
1627     else // don't change the font
1628     {
1629         hfontOld = 0;
1630     }
1631
1632     SIZE sizeRect;
1633     TEXTMETRIC tm;
1634
1635     GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect);
1636     GetTextMetrics(GetHdc(), &tm);
1637
1638     if (x)
1639         *x = sizeRect.cx;
1640     if (y)
1641         *y = sizeRect.cy;
1642     if (descent)
1643         *descent = tm.tmDescent;
1644     if (externalLeading)
1645         *externalLeading = tm.tmExternalLeading;
1646
1647     if ( hfontOld )
1648     {
1649         ::SelectObject(GetHdc(), hfontOld);
1650     }
1651 }
1652
1653
1654 // Each element of the array will be the width of the string up to and
1655 // including the coresoponding character in text.
1656
1657 bool wxDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
1658 {
1659     static int maxLenText = -1;
1660     static int maxWidth = -1;
1661     int fit = 0;
1662     SIZE sz = {0,0};
1663     int stlen = text.Length();
1664
1665     if (maxLenText == -1)
1666     {
1667         // Win9x and WinNT+ have different limits
1668         int version = wxGetOsVersion();
1669         maxLenText = version == wxWINDOWS_NT ? 65535 : 8192;
1670         maxWidth =   version == wxWINDOWS_NT ? INT_MAX : 32767;
1671     }
1672
1673     widths.Empty();
1674     widths.Add(0, stlen);  // fill the array with zeros
1675
1676     if (!::GetTextExtentExPoint(GetHdc(),
1677                                 text.c_str(),           // string to check
1678                                 wxMin(stlen, maxLenText),
1679                                 maxWidth,
1680                                 &fit,                   // [out] count of chars
1681                                                         // that will fit
1682                                 &widths[0],             // array to fill
1683                                 &sz))
1684     {
1685         // API failed
1686         wxLogLastError(wxT("GetTextExtentExPoint"));
1687         return false;
1688     }
1689
1690     return true;
1691 }
1692
1693
1694
1695
1696 void wxDC::SetMapMode(int mode)
1697 {
1698     WXMICROWIN_CHECK_HDC
1699
1700     m_mappingMode = mode;
1701
1702     if ( mode == wxMM_TEXT )
1703     {
1704         m_logicalScaleX =
1705         m_logicalScaleY = 1.0;
1706     }
1707     else // need to do some calculations
1708     {
1709         int pixel_width = ::GetDeviceCaps(GetHdc(), HORZRES),
1710             pixel_height = ::GetDeviceCaps(GetHdc(), VERTRES),
1711             mm_width = ::GetDeviceCaps(GetHdc(), HORZSIZE),
1712             mm_height = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1713
1714         if ( (mm_width == 0) || (mm_height == 0) )
1715         {
1716             // we can't calculate mm2pixels[XY] then!
1717             return;
1718         }
1719
1720         double mm2pixelsX = (double)pixel_width / mm_width,
1721                mm2pixelsY = (double)pixel_height / mm_height;
1722
1723         switch (mode)
1724         {
1725             case wxMM_TWIPS:
1726                 m_logicalScaleX = twips2mm * mm2pixelsX;
1727                 m_logicalScaleY = twips2mm * mm2pixelsY;
1728                 break;
1729
1730             case wxMM_POINTS:
1731                 m_logicalScaleX = pt2mm * mm2pixelsX;
1732                 m_logicalScaleY = pt2mm * mm2pixelsY;
1733                 break;
1734
1735             case wxMM_METRIC:
1736                 m_logicalScaleX = mm2pixelsX;
1737                 m_logicalScaleY = mm2pixelsY;
1738                 break;
1739
1740             case wxMM_LOMETRIC:
1741                 m_logicalScaleX = mm2pixelsX / 10.0;
1742                 m_logicalScaleY = mm2pixelsY / 10.0;
1743                 break;
1744
1745             default:
1746                 wxFAIL_MSG( _T("unknown mapping mode in SetMapMode") );
1747         }
1748     }
1749
1750     // VZ: it seems very wasteful to always use MM_ANISOTROPIC when in 99% of
1751     //     cases we could do with MM_TEXT and in the remaining 0.9% with
1752     //     MM_ISOTROPIC (TODO!)
1753 #ifndef __WXWINCE__
1754     ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1755
1756     int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX,
1757         height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY;
1758
1759     ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1760     ::SetWindowExtEx(GetHdc(), width, height, NULL);
1761
1762     ::SetViewportOrgEx(GetHdc(), m_deviceOriginX, m_deviceOriginY, NULL);
1763     ::SetWindowOrgEx(GetHdc(), m_logicalOriginX, m_logicalOriginY, NULL);
1764 #endif
1765 }
1766
1767 void wxDC::SetUserScale(double x, double y)
1768 {
1769     WXMICROWIN_CHECK_HDC
1770
1771     if ( x == m_userScaleX && y == m_userScaleY )
1772         return;
1773
1774     m_userScaleX = x;
1775     m_userScaleY = y;
1776
1777     this->SetMapMode(m_mappingMode);
1778 }
1779
1780 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1781 {
1782     WXMICROWIN_CHECK_HDC
1783
1784 #ifndef __WXWINCE__
1785     int signX = xLeftRight ? 1 : -1,
1786         signY = yBottomUp ? -1 : 1;
1787
1788     if ( signX != m_signX || signY != m_signY )
1789     {
1790         m_signX = signX;
1791         m_signY = signY;
1792
1793         SetMapMode(m_mappingMode);
1794     }
1795 #else
1796     wxUnusedVar(xLeftRight);
1797     wxUnusedVar(yBottomUp);
1798 #endif
1799 }
1800
1801 void wxDC::SetSystemScale(double x, double y)
1802 {
1803     WXMICROWIN_CHECK_HDC
1804
1805     if ( x == m_scaleX && y == m_scaleY )
1806         return;
1807
1808     m_scaleX = x;
1809     m_scaleY = y;
1810
1811 #ifndef __WXWINCE__
1812     SetMapMode(m_mappingMode);
1813 #endif
1814 }
1815
1816 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
1817 {
1818     WXMICROWIN_CHECK_HDC
1819
1820     if ( x == m_logicalOriginX && y == m_logicalOriginY )
1821         return;
1822
1823     m_logicalOriginX = x;
1824     m_logicalOriginY = y;
1825
1826 #ifndef __WXWINCE__
1827     ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1828 #endif
1829 }
1830
1831 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
1832 {
1833     WXMICROWIN_CHECK_HDC
1834
1835     if ( x == m_deviceOriginX && y == m_deviceOriginY )
1836         return;
1837
1838     m_deviceOriginX = x;
1839     m_deviceOriginY = y;
1840
1841 #ifndef __WXWINCE__
1842     ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1843 #endif
1844 }
1845
1846 // ---------------------------------------------------------------------------
1847 // coordinates transformations
1848 // ---------------------------------------------------------------------------
1849
1850 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1851 {
1852     return DeviceToLogicalXRel(x - m_deviceOriginX)*m_signX + m_logicalOriginX;
1853 }
1854
1855 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1856 {
1857     // axis orientation is not taken into account for conversion of a distance
1858     return (wxCoord)(x / (m_logicalScaleX*m_userScaleX*m_scaleX));
1859 }
1860
1861 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1862 {
1863     return DeviceToLogicalYRel(y - m_deviceOriginY)*m_signY + m_logicalOriginY;
1864 }
1865
1866 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1867 {
1868     // axis orientation is not taken into account for conversion of a distance
1869     return (wxCoord)( y / (m_logicalScaleY*m_userScaleY*m_scaleY));
1870 }
1871
1872 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1873 {
1874     return LogicalToDeviceXRel(x - m_logicalOriginX)*m_signX + m_deviceOriginX;
1875 }
1876
1877 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1878 {
1879     // axis orientation is not taken into account for conversion of a distance
1880     return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_scaleX);
1881 }
1882
1883 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1884 {
1885     return LogicalToDeviceYRel(y - m_logicalOriginY)*m_signY + m_deviceOriginY;
1886 }
1887
1888 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1889 {
1890     // axis orientation is not taken into account for conversion of a distance
1891     return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_scaleY);
1892 }
1893
1894 // ---------------------------------------------------------------------------
1895 // bit blit
1896 // ---------------------------------------------------------------------------
1897
1898 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
1899                   wxCoord width, wxCoord height,
1900                   wxDC *source, wxCoord xsrc, wxCoord ysrc,
1901                   int rop, bool useMask,
1902                   wxCoord xsrcMask, wxCoord ysrcMask)
1903 {
1904     wxCHECK_MSG( source, false, _T("wxDC::Blit(): NULL wxDC pointer") );
1905
1906     WXMICROWIN_CHECK_HDC_RET(false)
1907
1908     // if either the source or destination has alpha channel, we must use
1909     // AlphaBlt() as other function don't handle it correctly
1910     const wxBitmap& bmpSrc = source->m_selectedBitmap;
1911     if ( bmpSrc.Ok() && (bmpSrc.HasAlpha() ||
1912             (m_selectedBitmap.Ok() && m_selectedBitmap.HasAlpha())) )
1913     {
1914         if ( AlphaBlt(GetHdc(), xdest, ydest, width, height,
1915                       GetHdcOf(*source), bmpSrc) )
1916             return true;
1917     }
1918
1919     wxMask *mask = NULL;
1920     if ( useMask )
1921     {
1922         mask = bmpSrc.GetMask();
1923
1924         if ( !(bmpSrc.Ok() && mask && mask->GetMaskBitmap()) )
1925         {
1926             // don't give assert here because this would break existing
1927             // programs - just silently ignore useMask parameter
1928             useMask = false;
1929         }
1930     }
1931
1932     if (xsrcMask == -1 && ysrcMask == -1)
1933     {
1934         xsrcMask = xsrc; ysrcMask = ysrc;
1935     }
1936
1937     COLORREF old_textground = ::GetTextColor(GetHdc());
1938     COLORREF old_background = ::GetBkColor(GetHdc());
1939     if (m_textForegroundColour.Ok())
1940     {
1941         ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1942     }
1943     if (m_textBackgroundColour.Ok())
1944     {
1945         ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1946     }
1947
1948     DWORD dwRop;
1949     switch (rop)
1950     {
1951         case wxXOR:          dwRop = SRCINVERT;        break;
1952         case wxINVERT:       dwRop = DSTINVERT;        break;
1953         case wxOR_REVERSE:   dwRop = 0x00DD0228;       break;
1954         case wxAND_REVERSE:  dwRop = SRCERASE;         break;
1955         case wxCLEAR:        dwRop = BLACKNESS;        break;
1956         case wxSET:          dwRop = WHITENESS;        break;
1957         case wxOR_INVERT:    dwRop = MERGEPAINT;       break;
1958         case wxAND:          dwRop = SRCAND;           break;
1959         case wxOR:           dwRop = SRCPAINT;         break;
1960         case wxEQUIV:        dwRop = 0x00990066;       break;
1961         case wxNAND:         dwRop = 0x007700E6;       break;
1962         case wxAND_INVERT:   dwRop = 0x00220326;       break;
1963         case wxCOPY:         dwRop = SRCCOPY;          break;
1964         case wxNO_OP:        dwRop = DSTCOPY;          break;
1965         case wxSRC_INVERT:   dwRop = NOTSRCCOPY;       break;
1966         case wxNOR:          dwRop = NOTSRCCOPY;       break;
1967         default:
1968            wxFAIL_MSG( wxT("unsupported logical function") );
1969            return false;
1970     }
1971
1972     bool success = false;
1973
1974     if (useMask)
1975     {
1976 #ifdef __WIN32__
1977         // we want the part of the image corresponding to the mask to be
1978         // transparent, so use "DSTCOPY" ROP for the mask points (the usual
1979         // meaning of fg and bg is inverted which corresponds to wxWin notion
1980         // of the mask which is also contrary to the Windows one)
1981
1982         // On some systems, MaskBlt succeeds yet is much much slower
1983         // than the wxWidgets fall-back implementation. So we need
1984         // to be able to switch this on and off at runtime.
1985 #if wxUSE_SYSTEM_OPTIONS
1986         if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
1987 #endif
1988         {
1989            success = ::MaskBlt
1990                        (
1991                             GetHdc(),
1992                             xdest, ydest, width, height,
1993                             GetHdcOf(*source),
1994                             xsrc, ysrc,
1995                             (HBITMAP)mask->GetMaskBitmap(),
1996                             xsrcMask, ysrcMask,
1997                             MAKEROP4(dwRop, DSTCOPY)
1998                         ) != 0;
1999         }
2000
2001         if ( !success )
2002 #endif // Win32
2003         {
2004             // Blit bitmap with mask
2005             HDC dc_mask ;
2006             HDC  dc_buffer ;
2007             HBITMAP buffer_bmap ;
2008
2009 #if wxUSE_DC_CACHEING
2010             // create a temp buffer bitmap and DCs to access it and the mask
2011             wxDCCacheEntry* dcCacheEntry1 = FindDCInCache(NULL, source->GetHDC());
2012             dc_mask = (HDC) dcCacheEntry1->m_dc;
2013
2014             wxDCCacheEntry* dcCacheEntry2 = FindDCInCache(dcCacheEntry1, GetHDC());
2015             dc_buffer = (HDC) dcCacheEntry2->m_dc;
2016
2017             wxDCCacheEntry* bitmapCacheEntry = FindBitmapInCache(GetHDC(),
2018                 width, height);
2019
2020             buffer_bmap = (HBITMAP) bitmapCacheEntry->m_bitmap;
2021 #else // !wxUSE_DC_CACHEING
2022             // create a temp buffer bitmap and DCs to access it and the mask
2023             dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
2024             dc_buffer = ::CreateCompatibleDC(GetHdc());
2025             buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
2026 #endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING
2027             HGDIOBJ hOldMaskBitmap = ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
2028             HGDIOBJ hOldBufferBitmap = ::SelectObject(dc_buffer, buffer_bmap);
2029
2030             // copy dest to buffer
2031             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
2032                            GetHdc(), xdest, ydest, SRCCOPY) )
2033             {
2034                 wxLogLastError(wxT("BitBlt"));
2035             }
2036
2037             // copy src to buffer using selected raster op
2038             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
2039                            GetHdcOf(*source), xsrc, ysrc, dwRop) )
2040             {
2041                 wxLogLastError(wxT("BitBlt"));
2042             }
2043
2044             // set masked area in buffer to BLACK (pixel value 0)
2045             COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
2046             COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
2047             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
2048                            dc_mask, xsrcMask, ysrcMask, SRCAND) )
2049             {
2050                 wxLogLastError(wxT("BitBlt"));
2051             }
2052
2053             // set unmasked area in dest to BLACK
2054             ::SetBkColor(GetHdc(), RGB(0, 0, 0));
2055             ::SetTextColor(GetHdc(), RGB(255, 255, 255));
2056             if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
2057                            dc_mask, xsrcMask, ysrcMask, SRCAND) )
2058             {
2059                 wxLogLastError(wxT("BitBlt"));
2060             }
2061             ::SetBkColor(GetHdc(), prevBkCol);   // restore colours to original values
2062             ::SetTextColor(GetHdc(), prevCol);
2063
2064             // OR buffer to dest
2065             success = ::BitBlt(GetHdc(), xdest, ydest,
2066                                (int)width, (int)height,
2067                                dc_buffer, 0, 0, SRCPAINT) != 0;
2068             if ( !success )
2069             {
2070                 wxLogLastError(wxT("BitBlt"));
2071             }
2072
2073             // tidy up temporary DCs and bitmap
2074             ::SelectObject(dc_mask, hOldMaskBitmap);
2075             ::SelectObject(dc_buffer, hOldBufferBitmap);
2076
2077 #if !wxUSE_DC_CACHEING
2078             {
2079                 ::DeleteDC(dc_mask);
2080                 ::DeleteDC(dc_buffer);
2081                 ::DeleteObject(buffer_bmap);
2082             }
2083 #endif
2084         }
2085     }
2086     else // no mask, just BitBlt() it
2087     {
2088         // if we already have a DIB, draw it using StretchDIBits(), otherwise
2089         // use StretchBlt() if available and finally fall back to BitBlt()
2090
2091         // FIXME: use appropriate WinCE functions
2092 #ifndef __WXWINCE__
2093         const int caps = ::GetDeviceCaps(GetHdc(), RASTERCAPS);
2094         if ( bmpSrc.Ok() && (caps & RC_STRETCHDIB) )
2095         {
2096             DIBSECTION ds;
2097             wxZeroMemory(ds);
2098
2099             if ( ::GetObject(GetHbitmapOf(bmpSrc),
2100                              sizeof(ds),
2101                              &ds) == sizeof(ds) )
2102             {
2103                 StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
2104
2105                 // Figure out what co-ordinate system we're supposed to specify
2106                 // ysrc in.
2107                 const LONG hDIB = ds.dsBmih.biHeight;
2108                 if ( hDIB > 0 )
2109                 {
2110                     // reflect ysrc
2111                     ysrc = hDIB - (ysrc + height);
2112                 }
2113
2114                 if ( ::StretchDIBits(GetHdc(),
2115                                      xdest, ydest,
2116                                      width, height,
2117                                      xsrc, ysrc,
2118                                      width, height,
2119                                      ds.dsBm.bmBits,
2120                                      (LPBITMAPINFO)&ds.dsBmih,
2121                                      DIB_RGB_COLORS,
2122                                      SRCCOPY
2123                                      ) == (int)GDI_ERROR )
2124                 {
2125                     // On Win9x this API fails most (all?) of the time, so
2126                     // logging it becomes quite distracting.  Since it falls
2127                     // back to the code below this is not really serious, so
2128                     // don't log it.
2129                     //wxLogLastError(wxT("StretchDIBits"));
2130                 }
2131                 else
2132                 {
2133                     success = true;
2134                 }
2135             }
2136         }
2137
2138         if ( !success && (caps & RC_STRETCHBLT) )
2139 #endif
2140         // __WXWINCE__
2141         {
2142 #ifndef __WXWINCE__
2143             StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
2144 #endif
2145
2146             if ( !::StretchBlt
2147                     (
2148                         GetHdc(),
2149                         xdest, ydest, width, height,
2150                         GetHdcOf(*source),
2151                         xsrc, ysrc, width, height,
2152                         dwRop
2153                     ) )
2154             {
2155                 wxLogLastError(_T("StretchBlt"));
2156             }
2157             else
2158             {
2159                 success = true;
2160             }
2161         }
2162
2163         if ( !success )
2164         {
2165             if ( !::BitBlt
2166                     (
2167                         GetHdc(),
2168                         xdest, ydest,
2169                         (int)width, (int)height,
2170                         GetHdcOf(*source),
2171                         xsrc, ysrc,
2172                         dwRop
2173                     ) )
2174             {
2175                 wxLogLastError(_T("BitBlt"));
2176             }
2177             else
2178             {
2179                 success = true;
2180             }
2181         }
2182     }
2183
2184     ::SetTextColor(GetHdc(), old_textground);
2185     ::SetBkColor(GetHdc(), old_background);
2186
2187     return success;
2188 }
2189
2190 void wxDC::DoGetSize(int *w, int *h) const
2191 {
2192     WXMICROWIN_CHECK_HDC
2193
2194     if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
2195     if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
2196 }
2197
2198 void wxDC::DoGetSizeMM(int *w, int *h) const
2199 {
2200     WXMICROWIN_CHECK_HDC
2201
2202     // if we implement it in terms of DoGetSize() instead of directly using the
2203     // results returned by GetDeviceCaps(HORZ/VERTSIZE) as was done before, it
2204     // will also work for wxWindowDC and wxClientDC even though their size is
2205     // not the same as the total size of the screen
2206     int wPixels, hPixels;
2207     DoGetSize(&wPixels, &hPixels);
2208
2209     if ( w )
2210     {
2211         int wTotal = ::GetDeviceCaps(GetHdc(), HORZRES);
2212
2213         wxCHECK_RET( wTotal, _T("0 width device?") );
2214
2215         *w = (wPixels * ::GetDeviceCaps(GetHdc(), HORZSIZE)) / wTotal;
2216     }
2217
2218     if ( h )
2219     {
2220         int hTotal = ::GetDeviceCaps(GetHdc(), VERTRES);
2221
2222         wxCHECK_RET( hTotal, _T("0 height device?") );
2223
2224         *h = (hPixels * ::GetDeviceCaps(GetHdc(), VERTSIZE)) / hTotal;
2225     }
2226 }
2227
2228 wxSize wxDC::GetPPI() const
2229 {
2230     WXMICROWIN_CHECK_HDC_RET(wxSize())
2231
2232     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
2233     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
2234
2235     return wxSize(x, y);
2236 }
2237
2238 // For use by wxWidgets only, unless custom units are required.
2239 void wxDC::SetLogicalScale(double x, double y)
2240 {
2241     WXMICROWIN_CHECK_HDC
2242
2243     m_logicalScaleX = x;
2244     m_logicalScaleY = y;
2245 }
2246
2247 // ----------------------------------------------------------------------------
2248 // DC caching
2249 // ----------------------------------------------------------------------------
2250
2251 #if wxUSE_DC_CACHEING
2252
2253 /*
2254  * This implementation is a bit ugly and uses the old-fashioned wxList class, so I will
2255  * improve it in due course, either using arrays, or simply storing pointers to one
2256  * entry for the bitmap, and two for the DCs. -- JACS
2257  */
2258
2259 wxList wxDC::sm_bitmapCache;
2260 wxList wxDC::sm_dcCache;
2261
2262 wxDCCacheEntry::wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth)
2263 {
2264     m_bitmap = hBitmap;
2265     m_dc = 0;
2266     m_width = w;
2267     m_height = h;
2268     m_depth = depth;
2269 }
2270
2271 wxDCCacheEntry::wxDCCacheEntry(WXHDC hDC, int depth)
2272 {
2273     m_bitmap = 0;
2274     m_dc = hDC;
2275     m_width = 0;
2276     m_height = 0;
2277     m_depth = depth;
2278 }
2279
2280 wxDCCacheEntry::~wxDCCacheEntry()
2281 {
2282     if (m_bitmap)
2283         ::DeleteObject((HBITMAP) m_bitmap);
2284     if (m_dc)
2285         ::DeleteDC((HDC) m_dc);
2286 }
2287
2288 wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h)
2289 {
2290     int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
2291     wxList::compatibility_iterator node = sm_bitmapCache.GetFirst();
2292     while (node)
2293     {
2294         wxDCCacheEntry* entry = (wxDCCacheEntry*) node->GetData();
2295
2296         if (entry->m_depth == depth)
2297         {
2298             if (entry->m_width < w || entry->m_height < h)
2299             {
2300                 ::DeleteObject((HBITMAP) entry->m_bitmap);
2301                 entry->m_bitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h);
2302                 if ( !entry->m_bitmap)
2303                 {
2304                     wxLogLastError(wxT("CreateCompatibleBitmap"));
2305                 }
2306                 entry->m_width = w; entry->m_height = h;
2307                 return entry;
2308             }
2309             return entry;
2310         }
2311
2312         node = node->GetNext();
2313     }
2314     WXHBITMAP hBitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h);
2315     if ( !hBitmap)
2316     {
2317         wxLogLastError(wxT("CreateCompatibleBitmap"));
2318     }
2319     wxDCCacheEntry* entry = new wxDCCacheEntry(hBitmap, w, h, depth);
2320     AddToBitmapCache(entry);
2321     return entry;
2322 }
2323
2324 wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc)
2325 {
2326     int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
2327     wxList::compatibility_iterator node = sm_dcCache.GetFirst();
2328     while (node)
2329     {
2330         wxDCCacheEntry* entry = (wxDCCacheEntry*) node->GetData();
2331
2332         // Don't return the same one as we already have
2333         if (!notThis || (notThis != entry))
2334         {
2335             if (entry->m_depth == depth)
2336             {
2337                 return entry;
2338             }
2339         }
2340
2341         node = node->GetNext();
2342     }
2343     WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc);
2344     if ( !hDC)
2345     {
2346         wxLogLastError(wxT("CreateCompatibleDC"));
2347     }
2348     wxDCCacheEntry* entry = new wxDCCacheEntry(hDC, depth);
2349     AddToDCCache(entry);
2350     return entry;
2351 }
2352
2353 void wxDC::AddToBitmapCache(wxDCCacheEntry* entry)
2354 {
2355     sm_bitmapCache.Append(entry);
2356 }
2357
2358 void wxDC::AddToDCCache(wxDCCacheEntry* entry)
2359 {
2360     sm_dcCache.Append(entry);
2361 }
2362
2363 void wxDC::ClearCache()
2364 {
2365     WX_CLEAR_LIST(wxList, sm_dcCache);
2366     WX_CLEAR_LIST(wxList, sm_bitmapCache);
2367 }
2368
2369 // Clean up cache at app exit
2370 class wxDCModule : public wxModule
2371 {
2372 public:
2373     virtual bool OnInit() { return true; }
2374     virtual void OnExit() { wxDC::ClearCache(); }
2375
2376 private:
2377     DECLARE_DYNAMIC_CLASS(wxDCModule)
2378 };
2379
2380 IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule)
2381
2382 #endif // wxUSE_DC_CACHEING
2383
2384 // ----------------------------------------------------------------------------
2385 // alpha channel support
2386 // ----------------------------------------------------------------------------
2387
2388 static bool AlphaBlt(HDC hdcDst,
2389                      int x, int y, int width, int height,
2390                      HDC hdcSrc,
2391                      const wxBitmap& bmp)
2392 {
2393     wxASSERT_MSG( bmp.Ok() && bmp.HasAlpha(), _T("AlphaBlt(): invalid bitmap") );
2394     wxASSERT_MSG( hdcDst && hdcSrc, _T("AlphaBlt(): invalid HDC") );
2395
2396     // do we have AlphaBlend() and company in the headers?
2397 #if defined(AC_SRC_OVER) && wxUSE_DYNLIB_CLASS
2398     // yes, now try to see if we have it during run-time
2399     typedef BOOL (WINAPI *AlphaBlend_t)(HDC,int,int,int,int,
2400                                         HDC,int,int,int,int,
2401                                         BLENDFUNCTION);
2402
2403     // bitmaps can be drawn only from GUI thread so there is no need to
2404     // protect this static variable from multiple threads
2405     static bool s_triedToLoad = false;
2406     static AlphaBlend_t pfnAlphaBlend = NULL;
2407     if ( !s_triedToLoad )
2408     {
2409         s_triedToLoad = true;
2410
2411         // don't give errors about the DLL being unavailable, we're
2412         // prepared to handle this
2413         wxLogNull nolog;
2414
2415         wxDynamicLibrary dll(_T("msimg32.dll"));
2416         if ( dll.IsLoaded() )
2417         {
2418             pfnAlphaBlend = (AlphaBlend_t)dll.GetSymbol(_T("AlphaBlend"));
2419             if ( pfnAlphaBlend )
2420             {
2421                 // we must keep the DLL loaded if we want to be able to
2422                 // call AlphaBlend() so just never unload it at all, not a
2423                 // big deal
2424                 dll.Detach();
2425             }
2426         }
2427     }
2428
2429     if ( pfnAlphaBlend )
2430     {
2431         BLENDFUNCTION bf;
2432         bf.BlendOp = AC_SRC_OVER;
2433         bf.BlendFlags = 0;
2434         bf.SourceConstantAlpha = 0xff;
2435         bf.AlphaFormat = AC_SRC_ALPHA;
2436
2437         if ( pfnAlphaBlend(hdcDst, x, y, width, height,
2438                            hdcSrc, 0, 0, width, height,
2439                            bf) )
2440         {
2441             // skip wxAlphaBlend() call below
2442             return true;
2443         }
2444
2445         wxLogLastError(_T("AlphaBlend"));
2446     }
2447 #endif // defined(AC_SRC_OVER)
2448
2449     // AlphaBlend() unavailable of failed: use our own (probably much slower)
2450     // implementation
2451 #ifdef wxHAVE_RAW_BITMAP
2452     wxAlphaBlend(hdcDst, x, y, width, height, bmp);
2453
2454     return true;
2455 #else // !wxHAVE_RAW_BITMAP
2456     // no wxAlphaBlend() neither, fall back to using simple BitBlt() (we lose
2457     // alpha but at least something will be shown like this)
2458     wxUnusedVar(bmp);
2459     return false;
2460 #endif // wxHAVE_RAW_BITMAP
2461 }
2462
2463
2464 // wxAlphaBlend: our fallback if ::AlphaBlend() is unavailable
2465 #ifdef wxHAVE_RAW_BITMAP
2466
2467 static void
2468 wxAlphaBlend(HDC hdcDst, int xDst, int yDst, int w, int h, const wxBitmap& bmpSrc)
2469 {
2470     // get the destination DC pixels
2471     wxBitmap bmpDst(w, h, 32 /* force creating RGBA DIB */);
2472     MemoryHDC hdcMem;
2473     SelectInHDC select(hdcMem, GetHbitmapOf(bmpDst));
2474
2475     if ( !::BitBlt(hdcMem, 0, 0, w, h, hdcDst, 0, 0, SRCCOPY) )
2476     {
2477         wxLogLastError(_T("BitBlt"));
2478     }
2479
2480     // combine them with the source bitmap using alpha
2481     wxAlphaPixelData dataDst(bmpDst),
2482                      dataSrc((wxBitmap &)bmpSrc);
2483
2484     wxCHECK_RET( dataDst && dataSrc,
2485                     _T("failed to get raw data in wxAlphaBlend") );
2486
2487     wxAlphaPixelData::Iterator pDst(dataDst),
2488                                pSrc(dataSrc);
2489
2490     for ( int y = 0; y < h; y++ )
2491     {
2492         wxAlphaPixelData::Iterator pDstRowStart = pDst,
2493                                    pSrcRowStart = pSrc;
2494
2495         for ( int x = 0; x < w; x++ )
2496         {
2497             // note that source bitmap uses premultiplied alpha (as required by
2498             // the real AlphaBlend)
2499             const unsigned beta = 255 - pSrc.Alpha();
2500
2501             pDst.Red() = pSrc.Red() + (beta * pDst.Red() + 127) / 255;
2502             pDst.Blue() = pSrc.Blue() + (beta * pDst.Blue() + 127) / 255;
2503             pDst.Green() = pSrc.Green() + (beta * pDst.Green() + 127) / 255;
2504
2505             ++pDst;
2506             ++pSrc;
2507         }
2508
2509         pDst = pDstRowStart;
2510         pSrc = pSrcRowStart;
2511         pDst.OffsetY(dataDst, 1);
2512         pSrc.OffsetY(dataSrc, 1);
2513     }
2514
2515     // and finally blit them back to the destination DC
2516     if ( !::BitBlt(hdcDst, xDst, yDst, w, h, hdcMem, 0, 0, SRCCOPY) )
2517     {
2518         wxLogLastError(_T("BitBlt"));
2519     }
2520 }
2521
2522 #endif // #ifdef wxHAVE_RAW_BITMAP