src/msw/bitmap.cpp

   1 ////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/bitmap.cpp
   3 // Purpose:     wxBitmap
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/bitmap.h"
  28
  29 #ifndef WX_PRECOMP
  30     #include <stdio.h>
  31
  32     #include "wx/list.h"
  33     #include "wx/utils.h"
  34     #include "wx/app.h"
  35     #include "wx/palette.h"
  36     #include "wx/dcmemory.h"
  37     #include "wx/icon.h"
  38     #include "wx/log.h"
  39     #include "wx/image.h"
  40 #endif
  41
  42 #include "wx/msw/private.h"
  43 #include "wx/msw/dc.h"
  44
  45 #if wxUSE_WXDIB
  46     #include "wx/msw/dib.h"
  47 #endif
  48
  49 #ifdef wxHAS_RAW_BITMAP
  50     #include "wx/rawbmp.h"
  51 #endif
  52
  53 // missing from mingw32 header
  54 #ifndef CLR_INVALID
  55     #define CLR_INVALID ((COLORREF)-1)
  56 #endif // no CLR_INVALID
  57
  58 // ----------------------------------------------------------------------------
  59 // wxBitmapRefData
  60 // ----------------------------------------------------------------------------
  61
  62 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
  63 {
  64 public:
  65     wxBitmapRefData();
  66     wxBitmapRefData(const wxBitmapRefData& data);
  67     virtual ~wxBitmapRefData() { Free(); }
  68
  69     virtual void Free();
  70
  71     // set the mask object to use as the mask, we take ownership of it
  72     void SetMask(wxMask *mask)
  73     {
  74         delete m_bitmapMask;
  75         m_bitmapMask = mask;
  76     }
  77
  78     // set the HBITMAP to use as the mask
  79     void SetMask(HBITMAP hbmpMask)
  80     {
  81         SetMask(new wxMask((WXHBITMAP)hbmpMask));
  82     }
  83
  84     // return the mask
  85     wxMask *GetMask() const { return m_bitmapMask; }
  86
  87 public:
  88 #if wxUSE_PALETTE
  89     wxPalette     m_bitmapPalette;
  90 #endif // wxUSE_PALETTE
  91
  92     // MSW-specific
  93     // ------------
  94
  95 #if wxDEBUG_LEVEL
  96     // this field is solely for error checking: we detect selecting a bitmap
  97     // into more than one DC at once or deleting a bitmap still selected into a
  98     // DC (both are serious programming errors under Windows)
  99     wxDC         *m_selectedInto;
 100 #endif // wxDEBUG_LEVEL
 101
 102 #if wxUSE_WXDIB
 103     // when GetRawData() is called for a DDB we need to convert it to a DIB
 104     // first to be able to provide direct access to it and we cache that DIB
 105     // here and convert it back to DDB when UngetRawData() is called
 106     wxDIB *m_dib;
 107 #endif
 108
 109     // true if we have alpha transparency info and can be drawn using
 110     // AlphaBlend()
 111     bool m_hasAlpha;
 112
 113     // true if our HBITMAP is a DIB section, false if it is a DDB
 114     bool m_isDIB;
 115
 116 private:
 117     // optional mask for transparent drawing
 118     wxMask       *m_bitmapMask;
 119
 120
 121     // not implemented
 122     wxBitmapRefData& operator=(const wxBitmapRefData&);
 123 };
 124
 125 // ----------------------------------------------------------------------------
 126 // macros
 127 // ----------------------------------------------------------------------------
 128
 129 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
 130 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
 131
 132 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
 133
 134 // ============================================================================
 135 // implementation
 136 // ============================================================================
 137
 138 // ----------------------------------------------------------------------------
 139 // helper functions
 140 // ----------------------------------------------------------------------------
 141
 142 // decide whether we should create a DIB or a DDB for the given parameters
 143 //
 144 // NB: we always use DIBs under Windows CE as this is much simpler (even if
 145 //     also less efficient...) and we obviously can't use them if there is no
 146 //     DIB support compiled in at all
 147 #ifdef __WXWINCE__
 148     static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
 149
 150     #define ALWAYS_USE_DIB
 151 #elif !wxUSE_WXDIB
 152     // no sense in defining wxShouldCreateDIB() as we can't compile code
 153     // executed if it is true, so we have to use #if's anyhow
 154     #define NEVER_USE_DIB
 155 #else // wxUSE_WXDIB && !__WXWINCE__
 156     static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
 157     {
 158         // here is the logic:
 159         //
 160         //  (a) if hdc is specified, the caller explicitly wants DDB
 161         //  (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
 162         //      or less DIBs anyhow)
 163         //  (c) finally, create DIBs under Win9x even if the depth hasn't been
 164         //      explicitly specified but the current display depth is 24 or
 165         //      more and the image is "big", i.e. > 16Mb which is the
 166         //      theoretical limit for DDBs under Win9x
 167         //
 168         // consequences (all of which seem to make sense):
 169         //
 170         //  (i)     by default, DDBs are created (depth == -1 usually)
 171         //  (ii)    DIBs can be created by explicitly specifying the depth
 172         //  (iii)   using a DC always forces creating a DDB
 173         return !hdc &&
 174                 (d >= 24 ||
 175                     (d == -1 &&
 176                         wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
 177     }
 178
 179     #define SOMETIMES_USE_DIB
 180 #endif // different DIB usage scenarious
 181
 182 // ----------------------------------------------------------------------------
 183 // wxBitmapRefData
 184 // ----------------------------------------------------------------------------
 185
 186 wxBitmapRefData::wxBitmapRefData()
 187 {
 188 #if wxDEBUG_LEVEL
 189     m_selectedInto = NULL;
 190 #endif
 191     m_bitmapMask = NULL;
 192
 193     m_hBitmap = (WXHBITMAP) NULL;
 194 #if wxUSE_WXDIB
 195     m_dib = NULL;
 196 #endif
 197
 198     m_isDIB =
 199     m_hasAlpha = false;
 200 }
 201
 202 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
 203                : wxGDIImageRefData(data)
 204 {
 205 #if wxDEBUG_LEVEL
 206     m_selectedInto = NULL;
 207 #endif
 208
 209     // (deep) copy the mask if present
 210     m_bitmapMask = NULL;
 211     if (data.m_bitmapMask)
 212         m_bitmapMask = new wxMask(*data.m_bitmapMask);
 213
 214     // FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
 215     //        CloneGDIRefData()
 216
 217     wxASSERT_MSG( !data.m_isDIB,
 218                     wxT("can't copy bitmap locked for raw access!") );
 219     m_isDIB = false;
 220
 221     m_hasAlpha = data.m_hasAlpha;
 222 }
 223
 224 void wxBitmapRefData::Free()
 225 {
 226     wxASSERT_MSG( !m_selectedInto,
 227                   wxT("deleting bitmap still selected into wxMemoryDC") );
 228
 229 #if wxUSE_WXDIB
 230     wxASSERT_MSG( !m_dib, wxT("forgot to call wxBitmap::UngetRawData()!") );
 231 #endif
 232
 233     if ( m_hBitmap)
 234     {
 235         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
 236         {
 237             wxLogLastError(wxT("DeleteObject(hbitmap)"));
 238         }
 239     }
 240
 241     delete m_bitmapMask;
 242     m_bitmapMask = NULL;
 243 }
 244
 245 // ----------------------------------------------------------------------------
 246 // wxBitmap creation
 247 // ----------------------------------------------------------------------------
 248
 249 wxGDIImageRefData *wxBitmap::CreateData() const
 250 {
 251     return new wxBitmapRefData;
 252 }
 253
 254 wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *dataOrig) const
 255 {
 256     const wxBitmapRefData *
 257         data = static_cast<const wxBitmapRefData *>(dataOrig);
 258     if ( !data )
 259         return NULL;
 260
 261     // FIXME: this method is backwards, it should just create a new
 262     //        wxBitmapRefData using its copy ctor but instead it modifies this
 263     //        bitmap itself and then returns its m_refData -- which works, of
 264     //        course (except in !wxUSE_WXDIB), but is completely illogical
 265     wxBitmap *self = const_cast<wxBitmap *>(this);
 266
 267     wxBitmapRefData *selfdata;
 268 #if wxUSE_WXDIB
 269     // copy the other bitmap
 270     if ( data->m_hBitmap )
 271     {
 272         wxDIB dib((HBITMAP)(data->m_hBitmap));
 273         self->CopyFromDIB(dib);
 274
 275         selfdata = static_cast<wxBitmapRefData *>(m_refData);
 276         selfdata->m_hasAlpha = data->m_hasAlpha;
 277     }
 278     else
 279 #endif // wxUSE_WXDIB
 280     {
 281         // copy the bitmap data
 282         selfdata = new wxBitmapRefData(*data);
 283         self->m_refData = selfdata;
 284     }
 285
 286     // copy also the mask
 287     wxMask * const maskSrc = data->GetMask();
 288     if ( maskSrc )
 289     {
 290         selfdata->SetMask(new wxMask(*maskSrc));
 291     }
 292
 293     return selfdata;
 294 }
 295
 296 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
 297                                     wxBitmapTransparency transp)
 298 {
 299 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 300     // it may be either HICON or HCURSOR
 301     HICON hicon = (HICON)icon.GetHandle();
 302
 303     ICONINFO iconInfo;
 304     if ( !::GetIconInfo(hicon, &iconInfo) )
 305     {
 306         wxLogLastError(wxT("GetIconInfo"));
 307
 308         return false;
 309     }
 310
 311     wxBitmapRefData *refData = new wxBitmapRefData;
 312     m_refData = refData;
 313
 314     int w = icon.GetWidth(),
 315         h = icon.GetHeight();
 316
 317     refData->m_width = w;
 318     refData->m_height = h;
 319     refData->m_depth = wxDisplayDepth();
 320
 321     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 322
 323     switch ( transp )
 324     {
 325         default:
 326             wxFAIL_MSG( wxT("unknown wxBitmapTransparency value") );
 327
 328         case wxBitmapTransparency_None:
 329             // nothing to do, refData->m_hasAlpha is false by default
 330             break;
 331
 332         case wxBitmapTransparency_Auto:
 333 #if wxUSE_WXDIB
 334             // If the icon is 32 bits per pixel then it may have alpha channel
 335             // data, although there are some icons that are 32 bpp but have no
 336             // alpha... So convert to a DIB and manually check the 4th byte for
 337             // each pixel.
 338             {
 339                 BITMAP bm;
 340                 if ( ::GetObject(iconInfo.hbmColor, sizeof(bm), &bm) &&
 341                         (bm.bmBitsPixel == 32) )
 342                 {
 343                     wxDIB dib(iconInfo.hbmColor);
 344                     if (dib.IsOk())
 345                     {
 346                         const unsigned char* pixels = dib.GetData();
 347                         for (int idx = 0; idx < w*h*4; idx+=4)
 348                         {
 349                             if (pixels[idx+3] != 0)
 350                             {
 351                                 // If there is an alpha byte that is non-zero
 352                                 // then set the alpha flag and stop checking
 353                                 refData->m_hasAlpha = true;
 354                                 break;
 355                             }
 356                         }
 357                     }
 358                 }
 359             }
 360             break;
 361 #endif // wxUSE_WXDIB
 362
 363         case wxBitmapTransparency_Always:
 364             refData->m_hasAlpha = true;
 365             break;
 366     }
 367
 368     if ( !refData->m_hasAlpha )
 369     {
 370         // the mask returned by GetIconInfo() is inverted compared to the usual
 371         // wxWin convention
 372         refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
 373     }
 374
 375     // delete the old one now as we don't need it any more
 376     ::DeleteObject(iconInfo.hbmMask);
 377
 378     return true;
 379 #else // __WXMICROWIN__ || __WXWINCE__
 380     wxUnusedVar(icon);
 381     wxUnusedVar(transp);
 382
 383     return false;
 384 #endif // !__WXWINCE__/__WXWINCE__
 385 }
 386
 387 bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp)
 388 {
 389     UnRef();
 390
 391     if ( !cursor.Ok() )
 392         return false;
 393
 394     return CopyFromIconOrCursor(cursor, transp);
 395 }
 396
 397 bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp)
 398 {
 399     UnRef();
 400
 401     if ( !icon.Ok() )
 402         return false;
 403
 404     return CopyFromIconOrCursor(icon, transp);
 405 }
 406
 407 #ifndef NEVER_USE_DIB
 408
 409 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
 410 {
 411     wxCHECK_MSG( dib.IsOk(), false, wxT("invalid DIB in CopyFromDIB") );
 412
 413 #ifdef SOMETIMES_USE_DIB
 414     HBITMAP hbitmap = dib.CreateDDB();
 415     if ( !hbitmap )
 416         return false;
 417 #else // ALWAYS_USE_DIB
 418     HBITMAP hbitmap = ((wxDIB &)dib).Detach();  // const_cast
 419 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
 420
 421     UnRef();
 422
 423     wxBitmapRefData *refData = new wxBitmapRefData;
 424     m_refData = refData;
 425
 426     refData->m_width = dib.GetWidth();
 427     refData->m_height = dib.GetHeight();
 428     refData->m_depth = dib.GetDepth();
 429
 430     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 431
 432 #if wxUSE_PALETTE
 433     wxPalette *palette = dib.CreatePalette();
 434     if ( palette )
 435     {
 436         refData->m_bitmapPalette = *palette;
 437     }
 438
 439     delete palette;
 440 #endif // wxUSE_PALETTE
 441
 442     return true;
 443 }
 444
 445 #endif // NEVER_USE_DIB
 446
 447 wxBitmap::~wxBitmap()
 448 {
 449 }
 450
 451 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 452 {
 453 #ifndef __WXMICROWIN__
 454     wxBitmapRefData *refData = new wxBitmapRefData;
 455     m_refData = refData;
 456
 457     refData->m_width = width;
 458     refData->m_height = height;
 459     refData->m_depth = depth;
 460
 461     char *data;
 462     if ( depth == 1 )
 463     {
 464         // we assume that it is in XBM format which is not quite the same as
 465         // the format CreateBitmap() wants because the order of bytes in the
 466         // line is reversed!
 467         const size_t bytesPerLine = (width + 7) / 8;
 468         const size_t padding = bytesPerLine % 2;
 469         const size_t len = height * ( padding + bytesPerLine );
 470         data = (char *)malloc(len);
 471         const char *src = bits;
 472         char *dst = data;
 473
 474         for ( int rows = 0; rows < height; rows++ )
 475         {
 476             for ( size_t cols = 0; cols < bytesPerLine; cols++ )
 477             {
 478                 unsigned char val = *src++;
 479                 unsigned char reversed = 0;
 480
 481                 for ( int bits = 0; bits < 8; bits++)
 482                 {
 483                     reversed <<= 1;
 484                     reversed |= (unsigned char)(val & 0x01);
 485                     val >>= 1;
 486                 }
 487                 *dst++ = ~reversed;
 488             }
 489
 490             if ( padding )
 491                 *dst++ = 0;
 492         }
 493     }
 494     else
 495     {
 496         // bits should already be in Windows standard format
 497         data = (char *)bits;    // const_cast is harmless
 498     }
 499
 500     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
 501     if ( !hbmp )
 502     {
 503         wxLogLastError(wxT("CreateBitmap"));
 504     }
 505
 506     if ( data != bits )
 507     {
 508         free(data);
 509     }
 510
 511     SetHBITMAP((WXHBITMAP)hbmp);
 512 #endif
 513 }
 514
 515 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
 516 {
 517     (void)Create(w, h, dc);
 518 }
 519
 520 wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
 521 {
 522     (void)Create(data, type, width, height, depth);
 523 }
 524
 525 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 526 {
 527     LoadFile(filename, type);
 528 }
 529
 530 bool wxBitmap::Create(int width, int height, int depth)
 531 {
 532     return DoCreate(width, height, depth, 0);
 533 }
 534
 535 bool wxBitmap::Create(int width, int height, const wxDC& dc)
 536 {
 537     wxCHECK_MSG( dc.IsOk(), false, wxT("invalid HDC in wxBitmap::Create()") );
 538
 539     const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
 540
 541     if (impl)
 542         return DoCreate(width, height, -1, impl->GetHDC());
 543     else
 544         return false;
 545 }
 546
 547 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
 548 {
 549     UnRef();
 550
 551     m_refData = new wxBitmapRefData;
 552
 553     GetBitmapData()->m_width = w;
 554     GetBitmapData()->m_height = h;
 555
 556     HBITMAP hbmp    wxDUMMY_INITIALIZE(0);
 557
 558 #ifndef NEVER_USE_DIB
 559     if ( wxShouldCreateDIB(w, h, d, hdc) )
 560     {
 561         if ( d == -1 )
 562         {
 563             // create DIBs without alpha channel by default
 564             d = 24;
 565         }
 566
 567         wxDIB dib(w, h, d);
 568         if ( !dib.IsOk() )
 569            return false;
 570
 571         // don't delete the DIB section in dib object dtor
 572         hbmp = dib.Detach();
 573
 574         GetBitmapData()->m_isDIB = true;
 575         GetBitmapData()->m_depth = d;
 576     }
 577     else // create a DDB
 578 #endif // NEVER_USE_DIB
 579     {
 580 #ifndef ALWAYS_USE_DIB
 581 #ifndef __WXMICROWIN__
 582         if ( d > 0 )
 583         {
 584             hbmp = ::CreateBitmap(w, h, 1, d, NULL);
 585             if ( !hbmp )
 586             {
 587                 wxLogLastError(wxT("CreateBitmap"));
 588             }
 589
 590             GetBitmapData()->m_depth = d;
 591         }
 592         else // d == 0, create bitmap compatible with the screen
 593 #endif // !__WXMICROWIN__
 594         {
 595             ScreenHDC dc;
 596             hbmp = ::CreateCompatibleBitmap(dc, w, h);
 597             if ( !hbmp )
 598             {
 599                 wxLogLastError(wxT("CreateCompatibleBitmap"));
 600             }
 601
 602             GetBitmapData()->m_depth = wxDisplayDepth();
 603         }
 604 #endif // !ALWAYS_USE_DIB
 605     }
 606
 607     SetHBITMAP((WXHBITMAP)hbmp);
 608
 609     return Ok();
 610 }
 611
 612 #if wxUSE_IMAGE
 613
 614 // ----------------------------------------------------------------------------
 615 // wxImage to/from conversions for Microwin
 616 // ----------------------------------------------------------------------------
 617
 618 // Microwin versions are so different from normal ones that it really doesn't
 619 // make sense to use #ifdefs inside the function bodies
 620 #ifdef __WXMICROWIN__
 621
 622 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
 623 {
 624     // Set this to 1 to experiment with mask code,
 625     // which currently doesn't work
 626     #define USE_MASKS 0
 627
 628     m_refData = new wxBitmapRefData();
 629
 630     // Initial attempt at a simple-minded implementation.
 631     // The bitmap will always be created at the screen depth,
 632     // so the 'depth' argument is ignored.
 633
 634     HDC hScreenDC = ::GetDC(NULL);
 635     int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
 636
 637     HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
 638     HBITMAP hMaskBitmap = NULL;
 639     HBITMAP hOldMaskBitmap = NULL;
 640     HDC hMaskDC = NULL;
 641     unsigned char maskR = 0;
 642     unsigned char maskG = 0;
 643     unsigned char maskB = 0;
 644
 645     //    printf("Created bitmap %d\n", (int) hBitmap);
 646     if (hBitmap == NULL)
 647     {
 648         ::ReleaseDC(NULL, hScreenDC);
 649         return false;
 650     }
 651     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 652
 653     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 654     ::ReleaseDC(NULL, hScreenDC);
 655
 656     // created an mono-bitmap for the possible mask
 657     bool hasMask = image.HasMask();
 658
 659     if ( hasMask )
 660     {
 661 #if USE_MASKS
 662         // FIXME: we should be able to pass bpp = 1, but
 663         // GdBlit can't handle a different depth
 664 #if 0
 665         hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
 666 #else
 667         hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
 668 #endif
 669         maskR = image.GetMaskRed();
 670         maskG = image.GetMaskGreen();
 671         maskB = image.GetMaskBlue();
 672
 673         if (!hMaskBitmap)
 674         {
 675             hasMask = false;
 676         }
 677         else
 678         {
 679             hScreenDC = ::GetDC(NULL);
 680             hMaskDC = ::CreateCompatibleDC(hScreenDC);
 681            ::ReleaseDC(NULL, hScreenDC);
 682
 683             hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
 684         }
 685 #else
 686         hasMask = false;
 687 #endif
 688     }
 689
 690     int i, j;
 691     for (i = 0; i < image.GetWidth(); i++)
 692     {
 693         for (j = 0; j < image.GetHeight(); j++)
 694         {
 695             unsigned char red = image.GetRed(i, j);
 696             unsigned char green = image.GetGreen(i, j);
 697             unsigned char blue = image.GetBlue(i, j);
 698
 699             ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
 700
 701             if (hasMask)
 702             {
 703                 // scan the bitmap for the transparent colour and set the corresponding
 704                 // pixels in the mask to BLACK and the rest to WHITE
 705                 if (maskR == red && maskG == green && maskB == blue)
 706                     ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
 707                 else
 708                     ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
 709             }
 710         }
 711     }
 712
 713     ::SelectObject(hMemDC, hOldBitmap);
 714     ::DeleteDC(hMemDC);
 715     if (hasMask)
 716     {
 717         ::SelectObject(hMaskDC, hOldMaskBitmap);
 718         ::DeleteDC(hMaskDC);
 719
 720         ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
 721     }
 722
 723     SetWidth(image.GetWidth());
 724     SetHeight(image.GetHeight());
 725     SetDepth(screenDepth);
 726     SetHBITMAP( (WXHBITMAP) hBitmap );
 727
 728 #if wxUSE_PALETTE
 729     // Copy the palette from the source image
 730     SetPalette(image.GetPalette());
 731 #endif // wxUSE_PALETTE
 732
 733     return true;
 734 }
 735
 736 wxImage wxBitmap::ConvertToImage() const
 737 {
 738     // Initial attempt at a simple-minded implementation.
 739     // The bitmap will always be created at the screen depth,
 740     // so the 'depth' argument is ignored.
 741     // TODO: transparency (create a mask image)
 742
 743     if (!Ok())
 744     {
 745         wxFAIL_MSG( wxT("bitmap is invalid") );
 746         return wxNullImage;
 747     }
 748
 749     wxImage image;
 750
 751     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 752
 753     // create an wxImage object
 754     int width = GetWidth();
 755     int height = GetHeight();
 756     image.Create( width, height );
 757     unsigned char *data = image.GetData();
 758     if( !data )
 759     {
 760         wxFAIL_MSG( wxT("could not allocate data for image") );
 761         return wxNullImage;
 762     }
 763
 764     HDC hScreenDC = ::GetDC(NULL);
 765
 766     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 767     ::ReleaseDC(NULL, hScreenDC);
 768
 769     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 770
 771     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 772
 773     int i, j;
 774     for (i = 0; i < GetWidth(); i++)
 775     {
 776         for (j = 0; j < GetHeight(); j++)
 777         {
 778             COLORREF color = ::GetPixel(hMemDC, i, j);
 779             unsigned char red = GetRValue(color);
 780             unsigned char green = GetGValue(color);
 781             unsigned char blue = GetBValue(color);
 782
 783             image.SetRGB(i, j, red, green, blue);
 784         }
 785     }
 786
 787     ::SelectObject(hMemDC, hOldBitmap);
 788     ::DeleteDC(hMemDC);
 789
 790 #if wxUSE_PALETTE
 791     // Copy the palette from the source image
 792     if (GetPalette())
 793         image.SetPalette(* GetPalette());
 794 #endif // wxUSE_PALETTE
 795
 796     return image;
 797 }
 798
 799 #endif // __WXMICROWIN__
 800
 801 // ----------------------------------------------------------------------------
 802 // wxImage to/from conversions
 803 // ----------------------------------------------------------------------------
 804
 805 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 806 {
 807     return CreateFromImage(image, depth, 0);
 808 }
 809
 810 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
 811 {
 812     wxCHECK_MSG( dc.IsOk(), false,
 813                     wxT("invalid HDC in wxBitmap::CreateFromImage()") );
 814
 815     const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
 816
 817     if (impl)
 818         return CreateFromImage(image, -1, impl->GetHDC());
 819     else
 820         return false;
 821 }
 822
 823 #if wxUSE_WXDIB
 824
 825 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
 826 {
 827     wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
 828
 829     UnRef();
 830
 831     // first convert the image to DIB
 832     const int h = image.GetHeight();
 833     const int w = image.GetWidth();
 834
 835     wxDIB dib(image);
 836     if ( !dib.IsOk() )
 837         return false;
 838
 839     const bool hasAlpha = image.HasAlpha();
 840
 841     if (depth == -1)
 842       depth = dib.GetDepth();
 843
 844     // store the bitmap parameters
 845     wxBitmapRefData * const refData = new wxBitmapRefData;
 846     refData->m_width = w;
 847     refData->m_height = h;
 848     refData->m_hasAlpha = hasAlpha;
 849     refData->m_depth = depth;
 850
 851     m_refData = refData;
 852
 853
 854     // next either store DIB as is or create a DDB from it
 855     HBITMAP hbitmap     wxDUMMY_INITIALIZE(0);
 856
 857     // are we going to use DIB?
 858     //
 859     // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
 860     if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
 861     {
 862         // don't delete the DIB section in dib object dtor
 863         hbitmap = dib.Detach();
 864
 865         refData->m_isDIB = true;
 866     }
 867 #ifndef ALWAYS_USE_DIB
 868     else // we need to convert DIB to DDB
 869     {
 870         hbitmap = dib.CreateDDB((HDC)hdc);
 871     }
 872 #endif // !ALWAYS_USE_DIB
 873
 874     // validate this object
 875     SetHBITMAP((WXHBITMAP)hbitmap);
 876
 877     // finally also set the mask if we have one
 878     if ( image.HasMask() )
 879     {
 880         const size_t len  = 2*((w+15)/16);
 881         BYTE *src  = image.GetData();
 882         BYTE *data = new BYTE[h*len];
 883         memset(data, 0, h*len);
 884         BYTE r = image.GetMaskRed(),
 885              g = image.GetMaskGreen(),
 886              b = image.GetMaskBlue();
 887         BYTE *dst = data;
 888         for ( int y = 0; y < h; y++, dst += len )
 889         {
 890             BYTE *dstLine = dst;
 891             BYTE mask = 0x80;
 892             for ( int x = 0; x < w; x++, src += 3 )
 893             {
 894                 if (src[0] != r || src[1] != g || src[2] != b)
 895                     *dstLine |= mask;
 896
 897                 if ( (mask >>= 1) == 0 )
 898                 {
 899                     dstLine++;
 900                     mask = 0x80;
 901                 }
 902             }
 903         }
 904
 905         hbitmap = ::CreateBitmap(w, h, 1, 1, data);
 906         if ( !hbitmap )
 907         {
 908             wxLogLastError(wxT("CreateBitmap(mask)"));
 909         }
 910         else
 911         {
 912             SetMask(new wxMask((WXHBITMAP)hbitmap));
 913         }
 914
 915         delete[] data;
 916     }
 917
 918     return true;
 919 }
 920
 921 wxImage wxBitmap::ConvertToImage() const
 922 {
 923     // convert DDB to DIB
 924     wxDIB dib(*this);
 925
 926     if ( !dib.IsOk() )
 927     {
 928         return wxNullImage;
 929     }
 930
 931     // and then DIB to our wxImage
 932     wxImage image = dib.ConvertToImage();
 933     if ( !image.Ok() )
 934     {
 935         return wxNullImage;
 936     }
 937
 938     // now do the same for the mask, if we have any
 939     HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
 940     if ( hbmpMask )
 941     {
 942         wxDIB dibMask(hbmpMask);
 943         if ( dibMask.IsOk() )
 944         {
 945             // TODO: use wxRawBitmap to iterate over DIB
 946
 947             // we hard code the mask colour for now but we could also make an
 948             // effort (and waste time) to choose a colour not present in the
 949             // image already to avoid having to fudge the pixels below --
 950             // whether it's worth to do it is unclear however
 951             static const int MASK_RED = 1;
 952             static const int MASK_GREEN = 2;
 953             static const int MASK_BLUE = 3;
 954             static const int MASK_BLUE_REPLACEMENT = 2;
 955
 956             const int h = dibMask.GetHeight();
 957             const int w = dibMask.GetWidth();
 958             const int bpp = dibMask.GetDepth();
 959             const int maskBytesPerPixel = bpp >> 3;
 960             const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
 961             unsigned char *data = image.GetData();
 962
 963             // remember that DIBs are stored in bottom to top order
 964             unsigned char *
 965                 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
 966
 967             for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
 968             {
 969                 // traverse one mask DIB line
 970                 unsigned char *mask = maskLineStart;
 971                 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
 972                 {
 973                     // should this pixel be transparent?
 974                     if ( *mask )
 975                     {
 976                         // no, check that it isn't transparent by accident
 977                         if ( (data[0] == MASK_RED) &&
 978                                 (data[1] == MASK_GREEN) &&
 979                                     (data[2] == MASK_BLUE) )
 980                         {
 981                             // we have to fudge the colour a bit to prevent
 982                             // this pixel from appearing transparent
 983                             data[2] = MASK_BLUE_REPLACEMENT;
 984                         }
 985
 986                         data += 3;
 987                     }
 988                     else // yes, transparent pixel
 989                     {
 990                         *data++ = MASK_RED;
 991                         *data++ = MASK_GREEN;
 992                         *data++ = MASK_BLUE;
 993                     }
 994                 }
 995             }
 996
 997             image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
 998         }
 999     }
1000
1001     return image;
1002 }
1003
1004 #else // !wxUSE_WXDIB
1005
1006 bool
1007 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1008                           int WXUNUSED(depth),
1009                           WXHDC WXUNUSED(hdc))
1010 {
1011     return false;
1012 }
1013
1014 wxImage wxBitmap::ConvertToImage() const
1015 {
1016     return wxImage();
1017 }
1018
1019 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1020
1021 #endif // wxUSE_IMAGE
1022
1023 // ----------------------------------------------------------------------------
1024 // loading and saving bitmaps
1025 // ----------------------------------------------------------------------------
1026
1027 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
1028 {
1029     UnRef();
1030
1031     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1032
1033     if ( handler )
1034     {
1035         m_refData = new wxBitmapRefData;
1036
1037         return handler->LoadFile(this, filename, type, -1, -1);
1038     }
1039 #if wxUSE_IMAGE && wxUSE_WXDIB
1040     else // no bitmap handler found
1041     {
1042         wxImage image;
1043         if ( image.LoadFile( filename, type ) && image.Ok() )
1044         {
1045             *this = wxBitmap(image);
1046
1047             return true;
1048         }
1049     }
1050 #endif // wxUSE_IMAGE
1051
1052     return false;
1053 }
1054
1055 bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
1056 {
1057     UnRef();
1058
1059     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1060
1061     if ( !handler )
1062     {
1063         wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1064
1065         return false;
1066     }
1067
1068     m_refData = new wxBitmapRefData;
1069
1070     return handler->Create(this, data, type, width, height, depth);
1071 }
1072
1073 bool wxBitmap::SaveFile(const wxString& filename,
1074                         wxBitmapType type,
1075                         const wxPalette *palette) const
1076 {
1077     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1078
1079     if ( handler )
1080     {
1081         return handler->SaveFile(this, filename, type, palette);
1082     }
1083 #if wxUSE_IMAGE && wxUSE_WXDIB
1084     else // no bitmap handler found
1085     {
1086         // FIXME what about palette? shouldn't we use it?
1087         wxImage image = ConvertToImage();
1088         if ( image.Ok() )
1089         {
1090             return image.SaveFile(filename, type);
1091         }
1092     }
1093 #endif // wxUSE_IMAGE
1094
1095     return false;
1096 }
1097
1098 // ----------------------------------------------------------------------------
1099 // sub bitmap extraction
1100 // ----------------------------------------------------------------------------
1101 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1102 {
1103         MemoryHDC dcSrc;
1104         SelectInHDC selectSrc(dcSrc, GetHbitmap());
1105         return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1106 }
1107
1108 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1109 {
1110     wxCHECK_MSG( Ok() &&
1111                  (rect.x >= 0) && (rect.y >= 0) &&
1112                  (rect.x+rect.width <= GetWidth()) &&
1113                  (rect.y+rect.height <= GetHeight()),
1114                  wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1115
1116     wxBitmap ret( rect.width, rect.height, GetDepth() );
1117     wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1118
1119 #ifndef __WXMICROWIN__
1120     // handle alpha channel, if any
1121     if (HasAlpha())
1122         ret.UseAlpha();
1123
1124     // copy bitmap data
1125     MemoryHDC dcSrc,
1126               dcDst;
1127
1128     {
1129         SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1130
1131         if ( !selectDst )
1132         {
1133             wxLogLastError(wxT("SelectObject(destBitmap)"));
1134         }
1135
1136         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1137                        (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1138         {
1139             wxLogLastError(wxT("BitBlt"));
1140         }
1141     }
1142
1143     // copy mask if there is one
1144     if ( GetMask() )
1145     {
1146         HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1147
1148         SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1149                     selectDst(dcDst, hbmpMask);
1150
1151         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1152                        dcSrc, rect.x, rect.y, SRCCOPY) )
1153         {
1154             wxLogLastError(wxT("BitBlt"));
1155         }
1156
1157         wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1158         ret.SetMask(mask);
1159     }
1160 #endif // !__WXMICROWIN__
1161
1162     return ret;
1163 }
1164
1165 // ----------------------------------------------------------------------------
1166 // wxBitmap accessors
1167 // ----------------------------------------------------------------------------
1168
1169 #if wxUSE_PALETTE
1170 wxPalette* wxBitmap::GetPalette() const
1171 {
1172     return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1173                            : NULL;
1174 }
1175 #endif
1176
1177 wxMask *wxBitmap::GetMask() const
1178 {
1179     return GetBitmapData() ? GetBitmapData()->GetMask() : NULL;
1180 }
1181
1182 wxBitmap wxBitmap::GetMaskBitmap() const
1183 {
1184     wxBitmap bmp;
1185     wxMask *mask = GetMask();
1186     if ( mask )
1187         bmp.SetHBITMAP(mask->GetMaskBitmap());
1188     return bmp;
1189 }
1190
1191 wxDC *wxBitmap::GetSelectedInto() const
1192 {
1193 #if wxDEBUG_LEVEL
1194     return GetBitmapData() ? GetBitmapData()->m_selectedInto : NULL;
1195 #else
1196     return NULL;
1197 #endif
1198 }
1199
1200 void wxBitmap::UseAlpha()
1201 {
1202     if ( GetBitmapData() )
1203         GetBitmapData()->m_hasAlpha = true;
1204 }
1205
1206 bool wxBitmap::HasAlpha() const
1207 {
1208     return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1209 }
1210
1211 // ----------------------------------------------------------------------------
1212 // wxBitmap setters
1213 // ----------------------------------------------------------------------------
1214
1215 void wxBitmap::SetSelectedInto(wxDC *dc)
1216 {
1217 #if wxDEBUG_LEVEL
1218     if ( GetBitmapData() )
1219         GetBitmapData()->m_selectedInto = dc;
1220 #else
1221     wxUnusedVar(dc);
1222 #endif
1223 }
1224
1225 #if wxUSE_PALETTE
1226
1227 void wxBitmap::SetPalette(const wxPalette& palette)
1228 {
1229     AllocExclusive();
1230
1231     GetBitmapData()->m_bitmapPalette = palette;
1232 }
1233
1234 #endif // wxUSE_PALETTE
1235
1236 void wxBitmap::SetMask(wxMask *mask)
1237 {
1238     AllocExclusive();
1239
1240     GetBitmapData()->SetMask(mask);
1241 }
1242
1243 // ----------------------------------------------------------------------------
1244 // raw bitmap access support
1245 // ----------------------------------------------------------------------------
1246
1247 #ifdef wxHAS_RAW_BITMAP
1248
1249 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1250 {
1251 #if wxUSE_WXDIB
1252     if ( !Ok() )
1253     {
1254         // no bitmap, no data (raw or otherwise)
1255         return NULL;
1256     }
1257
1258     // if we're already a DIB we can access our data directly, but if not we
1259     // need to convert this DDB to a DIB section and use it for raw access and
1260     // then convert it back
1261     HBITMAP hDIB;
1262     if ( !GetBitmapData()->m_isDIB )
1263     {
1264         wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1265                         wxT("GetRawData() may be called only once") );
1266
1267         wxDIB *dib = new wxDIB(*this);
1268         if ( !dib->IsOk() )
1269         {
1270             delete dib;
1271
1272             return NULL;
1273         }
1274
1275         // we'll free it in UngetRawData()
1276         GetBitmapData()->m_dib = dib;
1277
1278         hDIB = dib->GetHandle();
1279     }
1280     else // we're a DIB
1281     {
1282         hDIB = GetHbitmap();
1283     }
1284
1285     DIBSECTION ds;
1286     if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1287     {
1288         wxFAIL_MSG( wxT("failed to get DIBSECTION from a DIB?") );
1289
1290         return NULL;
1291     }
1292
1293     // check that the bitmap is in correct format
1294     if ( ds.dsBm.bmBitsPixel != bpp )
1295     {
1296         wxFAIL_MSG( wxT("incorrect bitmap type in wxBitmap::GetRawData()") );
1297
1298         return NULL;
1299     }
1300
1301     // ok, store the relevant info in wxPixelDataBase
1302     const LONG h = ds.dsBm.bmHeight;
1303
1304     data.m_width = ds.dsBm.bmWidth;
1305     data.m_height = h;
1306
1307     // remember that DIBs are stored in top to bottom order!
1308     // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1309     // multiple of 2, as required by the documentation.  So we use the official
1310     // formula, which we already use elsewhere.)
1311     const LONG bytesPerRow =
1312         wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1313     data.m_stride = -bytesPerRow;
1314
1315     char *bits = (char *)ds.dsBm.bmBits;
1316     if ( h > 1 )
1317     {
1318         bits += (h - 1)*bytesPerRow;
1319     }
1320
1321     return bits;
1322 #else
1323     return NULL;
1324 #endif
1325 }
1326
1327 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1328 {
1329 #if wxUSE_WXDIB
1330     if ( !Ok() )
1331         return;
1332
1333     if ( !&dataBase )
1334     {
1335         // invalid data, don't crash -- but don't assert neither as we're
1336         // called automatically from wxPixelDataBase dtor and so there is no
1337         // way to prevent this from happening
1338         return;
1339     }
1340
1341     // if we're a DDB we need to convert DIB back to DDB now to make the
1342     // changes made via raw bitmap access effective
1343     if ( !GetBitmapData()->m_isDIB )
1344     {
1345         wxDIB *dib = GetBitmapData()->m_dib;
1346         GetBitmapData()->m_dib = NULL;
1347
1348         // TODO: convert
1349
1350         delete dib;
1351     }
1352 #endif // wxUSE_WXDIB
1353 }
1354 #endif // wxHAS_RAW_BITMAP
1355
1356 // ----------------------------------------------------------------------------
1357 // wxMask
1358 // ----------------------------------------------------------------------------
1359
1360 wxMask::wxMask()
1361 {
1362     m_maskBitmap = 0;
1363 }
1364
1365 // Copy constructor
1366 wxMask::wxMask(const wxMask &mask)
1367       : wxObject()
1368 {
1369     BITMAP bmp;
1370
1371     HDC srcDC = CreateCompatibleDC(0);
1372     HDC destDC = CreateCompatibleDC(0);
1373
1374     // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1375     // so we'll use GetObject() API here:
1376     if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1377     {
1378         wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1379         return;
1380     }
1381
1382     // create our HBITMAP
1383     int w = bmp.bmWidth, h = bmp.bmHeight;
1384     m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1385
1386     // copy the mask's HBITMAP into our HBITMAP
1387     SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1388     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1389
1390     BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1391
1392     SelectObject(srcDC, 0);
1393     DeleteDC(srcDC);
1394     SelectObject(destDC, 0);
1395     DeleteDC(destDC);
1396 }
1397
1398 // Construct a mask from a bitmap and a colour indicating
1399 // the transparent area
1400 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1401 {
1402     m_maskBitmap = 0;
1403     Create(bitmap, colour);
1404 }
1405
1406 // Construct a mask from a bitmap and a palette index indicating
1407 // the transparent area
1408 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1409 {
1410     m_maskBitmap = 0;
1411     Create(bitmap, paletteIndex);
1412 }
1413
1414 // Construct a mask from a mono bitmap (copies the bitmap).
1415 wxMask::wxMask(const wxBitmap& bitmap)
1416 {
1417     m_maskBitmap = 0;
1418     Create(bitmap);
1419 }
1420
1421 wxMask::~wxMask()
1422 {
1423     if ( m_maskBitmap )
1424         ::DeleteObject((HBITMAP) m_maskBitmap);
1425 }
1426
1427 // Create a mask from a mono bitmap (copies the bitmap).
1428 bool wxMask::Create(const wxBitmap& bitmap)
1429 {
1430 #ifndef __WXMICROWIN__
1431     wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1432                  wxT("can't create mask from invalid or not monochrome bitmap") );
1433
1434     if ( m_maskBitmap )
1435     {
1436         ::DeleteObject((HBITMAP) m_maskBitmap);
1437         m_maskBitmap = 0;
1438     }
1439
1440     m_maskBitmap = (WXHBITMAP) CreateBitmap(
1441                                             bitmap.GetWidth(),
1442                                             bitmap.GetHeight(),
1443                                             1, 1, 0
1444                                            );
1445     HDC srcDC = CreateCompatibleDC(0);
1446     SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1447     HDC destDC = CreateCompatibleDC(0);
1448     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1449     BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1450     SelectObject(srcDC, 0);
1451     DeleteDC(srcDC);
1452     SelectObject(destDC, 0);
1453     DeleteDC(destDC);
1454     return true;
1455 #else
1456     wxUnusedVar(bitmap);
1457     return false;
1458 #endif
1459 }
1460
1461 // Create a mask from a bitmap and a palette index indicating
1462 // the transparent area
1463 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1464 {
1465     if ( m_maskBitmap )
1466     {
1467         ::DeleteObject((HBITMAP) m_maskBitmap);
1468         m_maskBitmap = 0;
1469     }
1470
1471 #if wxUSE_PALETTE
1472     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1473     {
1474         unsigned char red, green, blue;
1475         if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1476         {
1477             wxColour transparentColour(red, green, blue);
1478             return Create(bitmap, transparentColour);
1479         }
1480     }
1481 #endif // wxUSE_PALETTE
1482
1483     return false;
1484 }
1485
1486 // Create a mask from a bitmap and a colour indicating
1487 // the transparent area
1488 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1489 {
1490 #ifndef __WXMICROWIN__
1491     wxCHECK_MSG( bitmap.Ok(), false, wxT("invalid bitmap in wxMask::Create") );
1492
1493     if ( m_maskBitmap )
1494     {
1495         ::DeleteObject((HBITMAP) m_maskBitmap);
1496         m_maskBitmap = 0;
1497     }
1498
1499     int width = bitmap.GetWidth(),
1500         height = bitmap.GetHeight();
1501
1502     // scan the bitmap for the transparent colour and set the corresponding
1503     // pixels in the mask to BLACK and the rest to WHITE
1504     COLORREF maskColour = wxColourToPalRGB(colour);
1505     m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1506
1507     HDC srcDC = ::CreateCompatibleDC(NULL);
1508     HDC destDC = ::CreateCompatibleDC(NULL);
1509     if ( !srcDC || !destDC )
1510     {
1511         wxLogLastError(wxT("CreateCompatibleDC"));
1512     }
1513
1514     bool ok = true;
1515
1516     // SelectObject() will fail
1517     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1518                   wxT("bitmap can't be selected in another DC") );
1519
1520     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1521     if ( !hbmpSrcOld )
1522     {
1523         wxLogLastError(wxT("SelectObject"));
1524
1525         ok = false;
1526     }
1527
1528     HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1529     if ( !hbmpDstOld )
1530     {
1531         wxLogLastError(wxT("SelectObject"));
1532
1533         ok = false;
1534     }
1535
1536     if ( ok )
1537     {
1538         // this will create a monochrome bitmap with 0 points for the pixels
1539         // which have the same value as the background colour and 1 for the
1540         // others
1541         ::SetBkColor(srcDC, maskColour);
1542         ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1543     }
1544
1545     ::SelectObject(srcDC, hbmpSrcOld);
1546     ::DeleteDC(srcDC);
1547     ::SelectObject(destDC, hbmpDstOld);
1548     ::DeleteDC(destDC);
1549
1550     return ok;
1551 #else // __WXMICROWIN__
1552     wxUnusedVar(bitmap);
1553     wxUnusedVar(colour);
1554     return false;
1555 #endif // __WXMICROWIN__/!__WXMICROWIN__
1556 }
1557
1558 // ----------------------------------------------------------------------------
1559 // wxBitmapHandler
1560 // ----------------------------------------------------------------------------
1561
1562 bool wxBitmapHandler::Create(wxGDIImage *image,
1563                              const void* data,
1564                              wxBitmapType type,
1565                              int width, int height, int depth)
1566 {
1567     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1568
1569     return bitmap && Create(bitmap, data, type, width, height, depth);
1570 }
1571
1572 bool wxBitmapHandler::Load(wxGDIImage *image,
1573                            const wxString& name,
1574                            wxBitmapType type,
1575                            int width, int height)
1576 {
1577     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1578
1579     return bitmap && LoadFile(bitmap, name, type, width, height);
1580 }
1581
1582 bool wxBitmapHandler::Save(const wxGDIImage *image,
1583                            const wxString& name,
1584                            wxBitmapType type) const
1585 {
1586     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1587
1588     return bitmap && SaveFile(bitmap, name, type);
1589 }
1590
1591 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1592                              const void* WXUNUSED(data),
1593                              wxBitmapType WXUNUSED(type),
1594                              int WXUNUSED(width),
1595                              int WXUNUSED(height),
1596                              int WXUNUSED(depth))
1597 {
1598     return false;
1599 }
1600
1601 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1602                                const wxString& WXUNUSED(name),
1603                                wxBitmapType WXUNUSED(type),
1604                                int WXUNUSED(desiredWidth),
1605                                int WXUNUSED(desiredHeight))
1606 {
1607     return false;
1608 }
1609
1610 bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap),
1611                                const wxString& WXUNUSED(name),
1612                                wxBitmapType WXUNUSED(type),
1613                                const wxPalette *WXUNUSED(palette)) const
1614 {
1615     return false;
1616 }
1617
1618 // ----------------------------------------------------------------------------
1619 // global helper functions implemented here
1620 // ----------------------------------------------------------------------------
1621
1622 // helper of wxBitmapToHICON/HCURSOR
1623 static
1624 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1625                              bool iconWanted,
1626                              int hotSpotX,
1627                              int hotSpotY)
1628 {
1629     if ( !bmp.Ok() )
1630     {
1631         // we can't create an icon/cursor form nothing
1632         return 0;
1633     }
1634
1635     if ( bmp.HasAlpha() )
1636     {
1637         // Create an empty mask bitmap.
1638         // it doesn't seem to work if we mess with the mask at all.
1639         HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1640
1641         ICONINFO iconInfo;
1642         wxZeroMemory(iconInfo);
1643         iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1644         if ( !iconWanted )
1645         {
1646             iconInfo.xHotspot = hotSpotX;
1647             iconInfo.yHotspot = hotSpotY;
1648         }
1649
1650         iconInfo.hbmMask = hMonoBitmap;
1651         iconInfo.hbmColor = GetHbitmapOf(bmp);
1652
1653         HICON hicon = ::CreateIconIndirect(&iconInfo);
1654
1655         ::DeleteObject(hMonoBitmap);
1656
1657         return hicon;
1658     }
1659
1660     wxMask* mask = bmp.GetMask();
1661
1662     if ( !mask )
1663     {
1664         // we must have a mask for an icon, so even if it's probably incorrect,
1665         // do create it (grey is the "standard" transparent colour)
1666         mask = new wxMask(bmp, *wxLIGHT_GREY);
1667     }
1668
1669     ICONINFO iconInfo;
1670     wxZeroMemory(iconInfo);
1671     iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1672     if ( !iconWanted )
1673     {
1674         iconInfo.xHotspot = hotSpotX;
1675         iconInfo.yHotspot = hotSpotY;
1676     }
1677
1678     iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1679     iconInfo.hbmColor = GetHbitmapOf(bmp);
1680
1681     // black out the transparent area to preserve background colour, because
1682     // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1683     // the mask to the dest rect.
1684     {
1685         MemoryHDC dcSrc, dcDst;
1686         SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1687                     selectBitmap(dcDst, iconInfo.hbmColor);
1688
1689         if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1690                        dcSrc, 0, 0, SRCAND) )
1691         {
1692             wxLogLastError(wxT("BitBlt"));
1693         }
1694     }
1695
1696     HICON hicon = ::CreateIconIndirect(&iconInfo);
1697
1698     if ( !bmp.GetMask() && !bmp.HasAlpha() )
1699     {
1700         // we created the mask, now delete it
1701         delete mask;
1702     }
1703
1704     // delete the inverted mask bitmap we created as well
1705     ::DeleteObject(iconInfo.hbmMask);
1706
1707     return hicon;
1708 }
1709
1710 HICON wxBitmapToHICON(const wxBitmap& bmp)
1711 {
1712     return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1713 }
1714
1715 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1716 {
1717     return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1718 }
1719
1720 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1721 {
1722 #ifndef __WXMICROWIN__
1723     wxCHECK_MSG( hbmpMask, 0, wxT("invalid bitmap in wxInvertMask") );
1724
1725     // get width/height from the bitmap if not given
1726     if ( !w || !h )
1727     {
1728         BITMAP bm;
1729         ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1730         w = bm.bmWidth;
1731         h = bm.bmHeight;
1732     }
1733
1734     HDC hdcSrc = ::CreateCompatibleDC(NULL);
1735     HDC hdcDst = ::CreateCompatibleDC(NULL);
1736     if ( !hdcSrc || !hdcDst )
1737     {
1738         wxLogLastError(wxT("CreateCompatibleDC"));
1739     }
1740
1741     HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1742     if ( !hbmpInvMask )
1743     {
1744         wxLogLastError(wxT("CreateBitmap"));
1745     }
1746
1747     HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1748     HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1749     if ( !::BitBlt(hdcDst, 0, 0, w, h,
1750                    hdcSrc, 0, 0,
1751                    NOTSRCCOPY) )
1752     {
1753         wxLogLastError(wxT("BitBlt"));
1754     }
1755
1756     // Deselect objects
1757     SelectObject(hdcSrc,srcTmp);
1758     SelectObject(hdcDst,dstTmp);
1759
1760     ::DeleteDC(hdcSrc);
1761     ::DeleteDC(hdcDst);
1762
1763     return hbmpInvMask;
1764 #else
1765     return 0;
1766 #endif
1767 }