src/dfb/dc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/dc.cpp
   3 // Purpose:     wxDC class
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-08-07
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ===========================================================================
  12 // declarations
  13 // ===========================================================================
  14
  15 // ---------------------------------------------------------------------------
  16 // headers
  17 // ---------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/dc.h"
  28     #include "wx/log.h"
  29 #endif
  30
  31 #include "wx/dfb/private.h"
  32
  33 // these values are used to initialize newly created DC
  34 #define DEFAULT_FONT      (*wxNORMAL_FONT)
  35 #define DEFAULT_PEN       (*wxBLACK_PEN)
  36 #define DEFAULT_BRUSH     (*wxWHITE_BRUSH)
  37
  38 // ===========================================================================
  39 // implementation
  40 // ===========================================================================
  41
  42 //-----------------------------------------------------------------------------
  43 // wxDC
  44 //-----------------------------------------------------------------------------
  45
  46 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
  47
  48 // Default constructor
  49 wxDC::wxDC()
  50 {
  51     m_ok = false;
  52 }
  53
  54 wxDC::wxDC(const wxIDirectFBSurfacePtr& surface)
  55 {
  56     DFBInit(surface);
  57 }
  58
  59 void wxDC::DFBInit(const wxIDirectFBSurfacePtr& surface)
  60 {
  61     m_ok = (surface != NULL);
  62     wxCHECK_RET( surface != NULL, _T("invalid surface") );
  63
  64     m_surface = surface;
  65
  66     m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
  67                     (double)wxGetDisplaySizeMM().GetWidth();
  68     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
  69                     (double)wxGetDisplaySizeMM().GetHeight();
  70
  71     SetFont(DEFAULT_FONT);
  72     SetPen(DEFAULT_PEN);
  73     SetBrush(DEFAULT_BRUSH);
  74 }
  75
  76
  77 // ---------------------------------------------------------------------------
  78 // clipping
  79 // ---------------------------------------------------------------------------
  80
  81 void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
  82 {
  83     wxCHECK_RET( Ok(), wxT("invalid dc") );
  84
  85     wxSize size(GetSize());
  86
  87     wxASSERT_MSG( !m_clipping,
  88                   _T("narrowing clipping region not implemented yet") );
  89
  90     // NB: We intersect the clipping rectangle with surface's area here because
  91     //     DirectFB will return an error if you try to set clipping rectangle
  92     //     that is partially outside of the surface.
  93     DFBRegion r;
  94     r.x1 = wxMax(0, XLOG2DEV(cx));
  95     r.y1 = wxMax(0, YLOG2DEV(cy));
  96     r.x2 = wxMin(r.x1 + XLOG2DEVREL(cw), size.x) - 1;
  97     r.y2 = wxMin(r.y1 + YLOG2DEVREL(ch), size.y) - 1;
  98
  99     if ( !m_surface->SetClip(&r) )
 100         return;
 101
 102     m_clipX1 = cx;
 103     m_clipY1 = cy;
 104     m_clipX2 = cx + cw - 1;
 105     m_clipY2 = cy + ch -1;
 106     m_clipping = true;
 107 }
 108
 109 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 110 {
 111     // NB: this can be done because wxDFB only supports rectangular regions
 112     SetClippingRegion(region.AsRect());
 113 }
 114
 115 void wxDC::DestroyClippingRegion()
 116 {
 117     wxCHECK_RET( Ok(), wxT("invalid dc") );
 118
 119     m_surface->SetClip(NULL);
 120
 121     ResetClipping();
 122 }
 123
 124 // ---------------------------------------------------------------------------
 125 // query capabilities
 126 // ---------------------------------------------------------------------------
 127
 128 int wxDC::GetDepth() const
 129 {
 130     return m_surface->GetDepth();
 131 }
 132
 133 // ---------------------------------------------------------------------------
 134 // drawing
 135 // ---------------------------------------------------------------------------
 136
 137 void wxDC::Clear()
 138 {
 139     wxCHECK_RET( Ok(), wxT("invalid dc") );
 140
 141     if ( m_backgroundBrush.GetStyle() == wxTRANSPARENT )
 142         return;
 143
 144     wxColour clr = m_backgroundBrush.GetColour();
 145     m_surface->Clear(clr.Red(), clr.Green(), clr.Blue(), clr.Alpha());
 146
 147     wxSize size(GetSize());
 148     CalcBoundingBox(XDEV2LOG(0), YDEV2LOG(0));
 149     CalcBoundingBox(XDEV2LOG(size.x), YDEV2LOG(size.y));
 150 }
 151
 152 extern bool wxDoFloodFill(wxDC *dc, wxCoord x, wxCoord y,
 153                           const wxColour & col, int style);
 154
 155 bool wxDC::DoFloodFill(wxCoord x, wxCoord y,
 156                        const wxColour& col, int style)
 157 {
 158     return wxDoFloodFill(this, x, y, col, style);
 159 }
 160
 161 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 162 {
 163     wxCHECK_MSG( col, false, _T("NULL colour parameter in wxDC::GetPixel"));
 164
 165     wxFAIL_MSG( _T("GetPixel not implemented") );
 166     return false;
 167 }
 168
 169 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 170 {
 171     wxCHECK_RET( Ok(), wxT("invalid dc") );
 172
 173     wxFAIL_MSG( _T("CrossHair not implemented") );
 174 }
 175
 176 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 177 {
 178     wxCHECK_RET( Ok(), wxT("invalid dc") );
 179
 180     if ( m_pen.GetStyle() == wxTRANSPARENT )
 181         return;
 182
 183     wxCoord xx1 = XLOG2DEV(x1);
 184     wxCoord yy1 = YLOG2DEV(y1);
 185     wxCoord xx2 = XLOG2DEV(x2);
 186     wxCoord yy2 = YLOG2DEV(y2);
 187
 188     // FIXME: DrawLine() shouldn't draw the last pixel, but DFB's DrawLine()
 189     //        does draw it. We should undo any change to the last pixel by
 190     //        using GetPixel() and PutPixel(), but until they are implemented,
 191     //        handle at least the special case of vertical and horizontal
 192     //        lines correctly:
 193     if ( xx1 == xx2 )
 194     {
 195         if ( yy1 < yy2 )
 196             yy2--;
 197         else if ( yy1 > yy2 )
 198             yy2++;
 199     }
 200     if ( yy1 == yy2 )
 201     {
 202         if ( xx1 < xx2 )
 203             xx2--;
 204         else if ( xx1 > xx2 )
 205             xx2++;
 206     }
 207
 208     m_surface->DrawLine(xx1, yy1, xx2, yy2);
 209
 210     CalcBoundingBox(x1, y1);
 211     CalcBoundingBox(x2, y2);
 212 }
 213
 214 // Draws an arc of a circle, centred on (xc, yc), with starting point (x1, y1)
 215 // and ending at (x2, y2)
 216 void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
 217                      wxCoord x2, wxCoord y2,
 218                      wxCoord xc, wxCoord yc)
 219 {
 220     wxCHECK_RET( Ok(), wxT("invalid dc") );
 221
 222     wxFAIL_MSG( _T("DrawArc not implemented") );
 223 }
 224
 225 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 226 {
 227     wxCHECK_RET( Ok(), wxT("invalid dc") );
 228
 229     // NB: DirectFB API doesn't provide a function for drawing points, so
 230     //     implement it as 1px long line. This is inefficient, but then, so is
 231     //     using DrawPoint() for drawing more than a few points.
 232     DoDrawLine(x, y, x, y);
 233
 234     // FIXME_DFB: implement special cases for common formats (RGB24,RGBA/RGB32)
 235 }
 236
 237 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int WXUNUSED(fillStyle))
 238 {
 239     wxCHECK_RET( Ok(), wxT("invalid dc") );
 240
 241     wxFAIL_MSG( _T("DrawPolygon not implemented") );
 242 }
 243
 244 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
 245 {
 246     wxCHECK_RET( Ok(), wxT("invalid dc") );
 247
 248     // TODO: impl. using DirectDB's DrawLines
 249     wxFAIL_MSG( _T("DrawLines not implemented") );
 250 }
 251
 252 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 253 {
 254     wxCHECK_RET( Ok(), wxT("invalid dc") );
 255
 256     wxCoord xx = XLOG2DEV(x);
 257     wxCoord yy = YLOG2DEV(y);
 258     wxCoord ww = m_signX * XLOG2DEVREL(width);
 259     wxCoord hh = m_signY * YLOG2DEVREL(height);
 260
 261     if ( ww == 0 || hh == 0 ) return;
 262
 263     if ( ww < 0 )
 264     {
 265         ww = -ww;
 266         xx = xx - ww;
 267     }
 268     if ( hh < 0 )
 269     {
 270         hh = -hh;
 271         yy = yy - hh;
 272     }
 273
 274     if ( m_brush.GetStyle() != wxTRANSPARENT )
 275     {
 276         SelectColour(m_brush.GetColour());
 277         m_surface->FillRectangle(xx, yy, ww, hh);
 278         // restore pen's colour, because other drawing functions expect the
 279         // colour to be set to the pen:
 280         SelectColour(m_pen.GetColour());
 281     }
 282
 283     if ( m_pen.GetStyle() != wxTRANSPARENT )
 284     {
 285         m_surface->DrawRectangle(xx, yy, ww, hh);
 286     }
 287
 288     CalcBoundingBox(x, y);
 289     CalcBoundingBox(x + width, y + height);
 290 }
 291
 292 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 293 {
 294     wxCHECK_RET( Ok(), wxT("invalid dc") );
 295
 296     wxFAIL_MSG( _T("DrawRoundedRectangle not implemented") );
 297 }
 298
 299 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 300 {
 301     wxCHECK_RET( Ok(), wxT("invalid dc") );
 302
 303     wxFAIL_MSG( _T("DrawElipse not implemented") );
 304 }
 305
 306 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
 307 {
 308     wxCHECK_RET( Ok(), wxT("invalid dc") );
 309
 310     wxFAIL_MSG( _T("DrawElipticArc not implemented") );
 311 }
 312
 313 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 314 {
 315     wxCHECK_RET( Ok(), wxT("invalid dc") );
 316
 317     wxCoord xx = XLOG2DEV(x);
 318     wxCoord yy = YLOG2DEV(y);
 319
 320     // update the bounding box
 321     wxCoord w, h;
 322     CalcBoundingBox(x, y);
 323     GetTextExtent(text, &w, &h);
 324     CalcBoundingBox(x + w, y + h);
 325
 326     // if background mode is solid, DrawText must paint text's background:
 327     if ( m_backgroundMode == wxSOLID )
 328     {
 329         wxCHECK_RET( m_textBackgroundColour.Ok(),
 330                      wxT("invalid background color") );
 331
 332         SelectColour(m_textBackgroundColour);
 333         m_surface->FillRectangle(xx, yy, XLOG2DEVREL(w), YLOG2DEVREL(h));
 334     }
 335
 336     // finally draw the text itself:
 337     wxCHECK_RET( m_textForegroundColour.Ok(),
 338                  wxT("invalid foreground color") );
 339     SelectColour(m_textForegroundColour);
 340     m_surface->DrawString(wxSTR_TO_DFB(text), -1, xx, yy, DSTF_LEFT | DSTF_TOP);
 341
 342     // restore pen's colour, because other drawing functions expect the colour
 343     // to be set to the pen:
 344     SelectColour(m_pen.GetColour());
 345 }
 346
 347 void wxDC::DoDrawRotatedText(const wxString& text,
 348                              wxCoord x, wxCoord y,
 349                              double angle)
 350 {
 351     wxCHECK_RET( Ok(), wxT("invalid dc") );
 352
 353     wxFAIL_MSG( _T("DrawRotatedText not implemented") );
 354 }
 355
 356 // ---------------------------------------------------------------------------
 357 // set GDI objects
 358 // ---------------------------------------------------------------------------
 359
 360 void wxDC::SetPen(const wxPen& pen)
 361 {
 362     m_pen = pen.Ok() ? pen : DEFAULT_PEN;
 363
 364     SelectColour(m_pen.GetColour());
 365 }
 366
 367 void wxDC::SetBrush(const wxBrush& brush)
 368 {
 369     m_brush = brush.Ok() ? brush : DEFAULT_BRUSH;
 370 }
 371
 372 void wxDC::SelectColour(const wxColour& clr)
 373 {
 374     m_surface->SetColor(clr.Red(), clr.Green(), clr.Blue(), clr.Alpha());
 375     #warning "use SetColorIndex?"
 376 }
 377
 378 #if wxUSE_PALETTE
 379 void wxDC::SetPalette(const wxPalette& WXUNUSED(palette))
 380 {
 381     wxCHECK_RET( Ok(), wxT("invalid dc") );
 382
 383     wxFAIL_MSG( _T("SetPalette not implemented") );
 384 }
 385 #endif // wxUSE_PALETTE
 386
 387 void wxDC::SetFont(const wxFont& font)
 388 {
 389     wxCHECK_RET( Ok(), wxT("invalid dc") );
 390
 391     wxFont f(font.Ok() ? font : DEFAULT_FONT);
 392
 393     if ( !m_surface->SetFont(f.GetDirectFBFont()) )
 394         return;
 395
 396     m_font = f;
 397 }
 398
 399 void wxDC::SetBackground(const wxBrush& brush)
 400 {
 401     wxCHECK_RET( Ok(), wxT("invalid dc") );
 402
 403     if (!brush.Ok()) return;
 404
 405     m_backgroundBrush = brush;
 406 }
 407
 408 void wxDC::SetBackgroundMode(int mode)
 409 {
 410     m_backgroundMode = mode;
 411 }
 412
 413 void wxDC::SetLogicalFunction(int function)
 414 {
 415     wxCHECK_RET( Ok(), wxT("invalid dc") );
 416
 417     // NB: we could also support XOR, but for blitting only (via DSBLIT_XOR);
 418     //     and possibly others via SetSrc/DstBlendFunction()
 419     wxASSERT_MSG( function == wxCOPY,
 420                   _T("only wxCOPY logical function supported") );
 421
 422     m_logicalFunction = function;
 423 }
 424
 425 bool wxDC::StartDoc(const wxString& WXUNUSED(message))
 426 {
 427     // We might be previewing, so return true to let it continue.
 428     return true;
 429 }
 430
 431 void wxDC::EndDoc()
 432 {
 433 }
 434
 435 void wxDC::StartPage()
 436 {
 437 }
 438
 439 void wxDC::EndPage()
 440 {
 441 }
 442
 443 // ---------------------------------------------------------------------------
 444 // text metrics
 445 // ---------------------------------------------------------------------------
 446
 447 wxCoord wxDC::GetCharHeight() const
 448 {
 449     wxCHECK_MSG( Ok(), -1, wxT("invalid dc") );
 450     wxCHECK_MSG( m_font.Ok(), -1, wxT("no font selected") );
 451
 452     int h = -1;
 453     m_font.GetDirectFBFont()->GetHeight(&h);
 454     return YDEV2LOGREL(h);
 455 }
 456
 457 wxCoord wxDC::GetCharWidth() const
 458 {
 459     wxCHECK_MSG( Ok(), -1, wxT("invalid dc") );
 460     wxCHECK_MSG( m_font.Ok(), -1, wxT("no font selected") );
 461
 462     int w = -1;
 463     m_font.GetDirectFBFont()->GetStringWidth("H", 1, &w);
 464     // VS: YDEV is corrent, it should *not* be XDEV, because font's are only
 465     //     scaled according to m_scaleY
 466     return YDEV2LOGREL(w);
 467 }
 468
 469 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
 470                            wxCoord *descent, wxCoord *externalLeading,
 471                            wxFont *theFont) const
 472 {
 473     wxCHECK_RET( Ok(), wxT("invalid dc") );
 474     wxCHECK_RET( m_font.Ok(), wxT("no font selected") );
 475     wxCHECK_RET( !theFont || theFont->Ok(), wxT("invalid font") );
 476
 477     wxFont oldFont;
 478     if ( theFont != NULL )
 479     {
 480         oldFont = m_font;
 481         wxConstCast(this, wxDC)->SetFont(*theFont);
 482     }
 483
 484     wxCoord xx = 0, yy = 0;
 485     DFBRectangle rect;
 486     wxIDirectFBFontPtr f = m_font.GetDirectFBFont();
 487
 488     if ( f->GetStringExtents(wxSTR_TO_DFB(string), -1, &rect, NULL) )
 489     {
 490         // VS: YDEV is corrent, it should *not* be XDEV, because font's are
 491         //     only scaled according to m_scaleY
 492         xx = YDEV2LOGREL(rect.w);
 493         yy = YDEV2LOGREL(rect.h);
 494
 495         if ( descent )
 496         {
 497             int d;
 498             if ( f->GetDescender(&d) )
 499                 *descent = YDEV2LOGREL(-d);
 500             else
 501                 *descent = 0;
 502         }
 503     }
 504
 505     if ( x ) *x = xx;
 506     if ( y ) *y = yy;
 507     if ( externalLeading ) *externalLeading = 0;
 508
 509     if ( theFont != NULL )
 510         wxConstCast(this, wxDC)->SetFont(oldFont);
 511 }
 512
 513
 514
 515 // ---------------------------------------------------------------------------
 516 // mapping modes
 517 // ---------------------------------------------------------------------------
 518
 519 void wxDC::ComputeScaleAndOrigin()
 520 {
 521     m_scaleX = m_logicalScaleX * m_userScaleX;
 522     m_scaleY = m_logicalScaleY * m_userScaleY;
 523
 524     // FIXME_DFB: scaling affects pixel size of font, pens, brushes, which
 525     //            is not currently implemented here; probably makes sense to
 526     //            switch to Cairo instead of implementing everything for DFB
 527     wxASSERT_MSG( m_scaleX == 1.0 && m_scaleY == 1.0,
 528                   _T("scaling is not implemented in wxDFB") );
 529 }
 530
 531 void wxDC::SetMapMode(int mode)
 532 {
 533     #warning "move this to common code, it's shared by almost all ports!"
 534     switch (mode)
 535     {
 536         case wxMM_TWIPS:
 537           SetLogicalScale(twips2mm*m_mm_to_pix_x, twips2mm*m_mm_to_pix_y);
 538           break;
 539         case wxMM_POINTS:
 540           SetLogicalScale(pt2mm*m_mm_to_pix_x, pt2mm*m_mm_to_pix_y);
 541           break;
 542         case wxMM_METRIC:
 543           SetLogicalScale(m_mm_to_pix_x, m_mm_to_pix_y);
 544           break;
 545         case wxMM_LOMETRIC:
 546           SetLogicalScale(m_mm_to_pix_x/10.0, m_mm_to_pix_y/10.0);
 547           break;
 548         default:
 549         case wxMM_TEXT:
 550           SetLogicalScale(1.0, 1.0);
 551           break;
 552     }
 553     m_mappingMode = mode;
 554 }
 555
 556 void wxDC::SetUserScale(double x, double y)
 557 {
 558     #warning "move this to common code?"
 559     // allow negative ? -> no
 560     m_userScaleX = x;
 561     m_userScaleY = y;
 562     ComputeScaleAndOrigin();
 563 }
 564
 565 void wxDC::SetLogicalScale(double x, double y)
 566 {
 567     #warning "move this to common code?"
 568     // allow negative ?
 569     m_logicalScaleX = x;
 570     m_logicalScaleY = y;
 571     ComputeScaleAndOrigin();
 572 }
 573
 574 void wxDC::SetLogicalOrigin( wxCoord x, wxCoord y )
 575 {
 576     #warning "move this to common code?"
 577     m_logicalOriginX = x * m_signX;   // is this still correct ?
 578     m_logicalOriginY = y * m_signY;
 579     ComputeScaleAndOrigin();
 580 }
 581
 582 void wxDC::SetDeviceOrigin( wxCoord x, wxCoord y )
 583 {
 584     #warning "move this to common code?"
 585     // only wxPostScripDC has m_signX = -1, we override SetDeviceOrigin there
 586     m_deviceOriginX = x;
 587     m_deviceOriginY = y;
 588     ComputeScaleAndOrigin();
 589 }
 590
 591 void wxDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
 592 {
 593     #warning "move this to common code?"
 594     // only wxPostScripDC has m_signX = -1, we override SetAxisOrientation there
 595     m_signX = (xLeftRight ?  1 : -1);
 596     m_signY = (yBottomUp  ? -1 :  1);
 597     ComputeScaleAndOrigin();
 598 }
 599
 600 // ---------------------------------------------------------------------------
 601 // coordinates transformations
 602 // ---------------------------------------------------------------------------
 603
 604 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 605 {
 606     return ((wxDC *)this)->XDEV2LOG(x);
 607 }
 608
 609 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 610 {
 611     return ((wxDC *)this)->YDEV2LOG(y);
 612 }
 613
 614 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 615 {
 616     return ((wxDC *)this)->XDEV2LOGREL(x);
 617 }
 618
 619 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 620 {
 621     return ((wxDC *)this)->YDEV2LOGREL(y);
 622 }
 623
 624 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 625 {
 626     return ((wxDC *)this)->XLOG2DEV(x);
 627 }
 628
 629 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 630 {
 631     return ((wxDC *)this)->YLOG2DEV(y);
 632 }
 633
 634 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 635 {
 636     return ((wxDC *)this)->XLOG2DEVREL(x);
 637 }
 638
 639 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 640 {
 641     return ((wxDC *)this)->YLOG2DEVREL(y);
 642 }
 643
 644
 645 void wxDC::DoGetSize(int *w, int *h) const
 646 {
 647     wxCHECK_RET( Ok(), wxT("invalid dc") );
 648
 649     m_surface->GetSize(w, h);
 650 }
 651
 652 void wxDC::DoGetSizeMM(int *width, int *height) const
 653 {
 654     #warning "move this to common code?"
 655     int w = 0;
 656     int h = 0;
 657     GetSize(&w, &h);
 658     if ( width ) *width = int(double(w) / (m_userScaleX*m_mm_to_pix_x));
 659     if ( height ) *height = int(double(h) / (m_userScaleY*m_mm_to_pix_y));
 660 }
 661
 662 wxSize wxDC::GetPPI() const
 663 {
 664     #warning "move this to common code?"
 665     return wxSize(int(double(m_mm_to_pix_x) * inches2mm),
 666                   int(double(m_mm_to_pix_y) * inches2mm));
 667 }
 668
 669
 670 // ---------------------------------------------------------------------------
 671 // Blitting
 672 // ---------------------------------------------------------------------------
 673
 674 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 675                   wxCoord width, wxCoord height,
 676                   wxDC *source, wxCoord xsrc, wxCoord ysrc,
 677                   int rop, bool useMask,
 678                   wxCoord xsrcMask, wxCoord ysrcMask)
 679 {
 680     wxCHECK_MSG( Ok(), false, _T("invalid dc") );
 681     wxCHECK_MSG( source, false, _T("invalid source dc") );
 682
 683     // NB: we could also support XOR here (via DSBLIT_XOR)
 684     //     and possibly others via SetSrc/DstBlendFunction()
 685     wxCHECK_MSG( rop == wxCOPY, false, _T("only wxCOPY function supported") );
 686
 687     // transform the source DC coords to the device ones
 688     xsrc = source->LogicalToDeviceX(xsrc);
 689     ysrc = source->LogicalToDeviceY(ysrc);
 690
 691     // FIXME_DFB: use the mask origin when drawing transparently
 692     wxASSERT_MSG( xsrcMask == -1 && ysrcMask == -1,
 693                   _T("non-default source mask offset not implemented") );
 694 #if 0
 695     if (xsrcMask == -1 && ysrcMask == -1)
 696     {
 697         xsrcMask = xsrc; ysrcMask = ysrc;
 698     }
 699     else
 700     {
 701         xsrcMask = source->LogicalToDeviceX(xsrcMask);
 702         ysrcMask = source->LogicalToDeviceY(ysrcMask);
 703     }
 704 #endif
 705
 706     wxMemoryDC *sourceAsMemDC = wxDynamicCast(source, wxMemoryDC);
 707     if ( sourceAsMemDC )
 708     {
 709         DoDrawSubBitmap(sourceAsMemDC->GetSelectedObject(),
 710                         xsrc, ysrc,
 711                         width, height,
 712                         xdest, ydest,
 713                         rop,
 714                         useMask);
 715     }
 716     else
 717     {
 718         return DoBlitFromSurface(source->GetDirectFBSurface(),
 719                                  xsrc, ysrc,
 720                                  width, height,
 721                                  xdest, ydest);
 722     }
 723
 724     return true;
 725 }
 726
 727 void wxDC::DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask)
 728 {
 729     wxCHECK_RET( Ok(), wxT("invalid dc") );
 730     wxCHECK_RET( bmp.Ok(), wxT("invalid bitmap") );
 731
 732     DoDrawSubBitmap(bmp,
 733                     0, 0, bmp.GetWidth(), bmp.GetHeight(),
 734                     x, y,
 735                     m_logicalFunction, useMask);
 736 }
 737
 738 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 739 {
 740     // VZ: egcs 1.0.3 refuses to compile this without cast, no idea why
 741     DoDrawBitmap((const wxBitmap&)icon, x, y, true);
 742 }
 743
 744 void wxDC::DoDrawSubBitmap(const wxBitmap &bmp,
 745                            wxCoord x, wxCoord y, wxCoord w, wxCoord h,
 746                            wxCoord destx, wxCoord desty, int rop, bool useMask)
 747 {
 748     wxCHECK_RET( Ok(), wxT("invalid dc") );
 749     wxCHECK_RET( bmp.Ok(), wxT("invalid bitmap") );
 750
 751     // NB: we could also support XOR here (via DSBLIT_XOR)
 752     //     and possibly others via SetSrc/DstBlendFunction()
 753     wxCHECK_RET( rop == wxCOPY, _T("only wxCOPY function supported") );
 754
 755     if ( bmp.GetDepth() == 1 )
 756     {
 757         // Mono bitmaps are handled in special way -- all 1s are drawn in
 758         // foreground colours, all 0s in background colour.
 759         wxFAIL_MSG( _T("drawing mono bitmaps not implemented") );
 760         return;
 761     }
 762
 763     if ( useMask && bmp.GetMask() )
 764     {
 765         // FIXME_DFB: see MGL sources for a way to do it, but it's not directly
 766         //            applicable because DirectFB doesn't implement ROPs; OTOH,
 767         //            it has blitting modes that can be useful; finally, see
 768         //            DFB's SetSrcBlendFunction() and SetSrcColorKey()
 769         wxFAIL_MSG( _T("drawing bitmaps with masks not implemented") );
 770         return;
 771     }
 772
 773     DoBlitFromSurface(bmp.GetDirectFBSurface(),
 774                       x, y,
 775                       w, h,
 776                       destx, desty);
 777 }
 778
 779 bool wxDC::DoBlitFromSurface(const wxIDirectFBSurfacePtr& src,
 780                              wxCoord srcx, wxCoord srcy,
 781                              wxCoord w, wxCoord h,
 782                              wxCoord dstx, wxCoord dsty)
 783 {
 784     // don't do anything if the source rectangle is outside of source surface,
 785     // DirectFB would assert in that case:
 786     wxSize srcsize;
 787     src->GetSize(&srcsize.x, &srcsize.y);
 788     if ( !wxRect(srcx, srcy, w, h).Intersects(wxRect(srcsize)) )
 789     {
 790         wxLogDebug(_T("Blitting from area outside of the source surface, caller code needs fixing."));
 791         return false;
 792     }
 793
 794     CalcBoundingBox(dstx, dsty);
 795     CalcBoundingBox(dstx + w, dsty + h);
 796
 797     DFBRectangle srcRect = { srcx, srcy, w, h };
 798     DFBRectangle dstRect = { XLOG2DEV(dstx), YLOG2DEV(dsty),
 799                              XLOG2DEVREL(w), YLOG2DEVREL(h) };
 800
 801     wxIDirectFBSurfacePtr dst(m_surface);
 802
 803     // FIXME: this will have to be different in useMask case, see above
 804     if ( !dst->SetBlittingFlags(DSBLIT_NOFX) )
 805         return false;
 806
 807     if ( srcRect.w != dstRect.w || srcRect.h != dstRect.h )
 808     {
 809         // the bitmap is drawn stretched:
 810         dst->StretchBlit(src, &srcRect, &dstRect);
 811     }
 812     else
 813     {
 814         // no stretching, size is preserved:
 815         dst->Blit(src, &srcRect, dstRect.x, dstRect.y);
 816     }
 817
 818     return true;
 819 }