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     wxDELETE(m_bitmapMask);
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // wxBitmap creation
 246 // ----------------------------------------------------------------------------
 247
 248 wxGDIImageRefData *wxBitmap::CreateData() const
 249 {
 250     return new wxBitmapRefData;
 251 }
 252
 253 wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *dataOrig) const
 254 {
 255     const wxBitmapRefData *
 256         data = static_cast<const wxBitmapRefData *>(dataOrig);
 257     if ( !data )
 258         return NULL;
 259
 260     // FIXME: this method is backwards, it should just create a new
 261     //        wxBitmapRefData using its copy ctor but instead it modifies this
 262     //        bitmap itself and then returns its m_refData -- which works, of
 263     //        course (except in !wxUSE_WXDIB), but is completely illogical
 264     wxBitmap *self = const_cast<wxBitmap *>(this);
 265
 266     wxBitmapRefData *selfdata;
 267 #if wxUSE_WXDIB
 268     // copy the other bitmap
 269     if ( data->m_hBitmap )
 270     {
 271         wxDIB dib((HBITMAP)(data->m_hBitmap));
 272         self->CopyFromDIB(dib);
 273
 274         selfdata = static_cast<wxBitmapRefData *>(m_refData);
 275         selfdata->m_hasAlpha = data->m_hasAlpha;
 276     }
 277     else
 278 #endif // wxUSE_WXDIB
 279     {
 280         // copy the bitmap data
 281         selfdata = new wxBitmapRefData(*data);
 282         self->m_refData = selfdata;
 283     }
 284
 285     // copy also the mask
 286     wxMask * const maskSrc = data->GetMask();
 287     if ( maskSrc )
 288     {
 289         selfdata->SetMask(new wxMask(*maskSrc));
 290     }
 291
 292     return selfdata;
 293 }
 294
 295 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
 296                                     wxBitmapTransparency transp)
 297 {
 298 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 299     // it may be either HICON or HCURSOR
 300     HICON hicon = (HICON)icon.GetHandle();
 301
 302     ICONINFO iconInfo;
 303     if ( !::GetIconInfo(hicon, &iconInfo) )
 304     {
 305         wxLogLastError(wxT("GetIconInfo"));
 306
 307         return false;
 308     }
 309
 310     wxBitmapRefData *refData = new wxBitmapRefData;
 311     m_refData = refData;
 312
 313     int w = icon.GetWidth(),
 314         h = icon.GetHeight();
 315
 316     refData->m_width = w;
 317     refData->m_height = h;
 318     refData->m_depth = wxDisplayDepth();
 319
 320     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 321
 322     switch ( transp )
 323     {
 324         default:
 325             wxFAIL_MSG( wxT("unknown wxBitmapTransparency value") );
 326
 327         case wxBitmapTransparency_None:
 328             // nothing to do, refData->m_hasAlpha is false by default
 329             break;
 330
 331         case wxBitmapTransparency_Auto:
 332 #if wxUSE_WXDIB
 333             // If the icon is 32 bits per pixel then it may have alpha channel
 334             // data, although there are some icons that are 32 bpp but have no
 335             // alpha... So convert to a DIB and manually check the 4th byte for
 336             // each pixel.
 337             {
 338                 BITMAP bm;
 339                 if ( ::GetObject(iconInfo.hbmColor, sizeof(bm), &bm) &&
 340                         (bm.bmBitsPixel == 32) )
 341                 {
 342                     wxDIB dib(iconInfo.hbmColor);
 343                     if (dib.IsOk())
 344                     {
 345                         const unsigned char* pixels = dib.GetData();
 346                         for (int idx = 0; idx < w*h*4; idx+=4)
 347                         {
 348                             if (pixels[idx+3] != 0)
 349                             {
 350                                 // If there is an alpha byte that is non-zero
 351                                 // then set the alpha flag and stop checking
 352                                 refData->m_hasAlpha = true;
 353                                 break;
 354                             }
 355                         }
 356                     }
 357                 }
 358             }
 359             break;
 360 #endif // wxUSE_WXDIB
 361
 362         case wxBitmapTransparency_Always:
 363             refData->m_hasAlpha = true;
 364             break;
 365     }
 366
 367     if ( !refData->m_hasAlpha )
 368     {
 369         // the mask returned by GetIconInfo() is inverted compared to the usual
 370         // wxWin convention
 371         refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
 372     }
 373
 374     // delete the old one now as we don't need it any more
 375     ::DeleteObject(iconInfo.hbmMask);
 376
 377     return true;
 378 #else // __WXMICROWIN__ || __WXWINCE__
 379     wxUnusedVar(icon);
 380     wxUnusedVar(transp);
 381
 382     return false;
 383 #endif // !__WXWINCE__/__WXWINCE__
 384 }
 385
 386 bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp)
 387 {
 388     UnRef();
 389
 390     if ( !cursor.IsOk() )
 391         return false;
 392
 393     return CopyFromIconOrCursor(cursor, transp);
 394 }
 395
 396 bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp)
 397 {
 398     UnRef();
 399
 400     if ( !icon.IsOk() )
 401         return false;
 402
 403     return CopyFromIconOrCursor(icon, transp);
 404 }
 405
 406 #ifndef NEVER_USE_DIB
 407
 408 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
 409 {
 410     wxCHECK_MSG( dib.IsOk(), false, wxT("invalid DIB in CopyFromDIB") );
 411
 412 #ifdef SOMETIMES_USE_DIB
 413     HBITMAP hbitmap = dib.CreateDDB();
 414     if ( !hbitmap )
 415         return false;
 416 #else // ALWAYS_USE_DIB
 417     HBITMAP hbitmap = const_cast<wxDIB &>(dib).Detach();
 418 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
 419
 420     UnRef();
 421
 422     wxBitmapRefData *refData = new wxBitmapRefData;
 423     m_refData = refData;
 424
 425     refData->m_width = dib.GetWidth();
 426     refData->m_height = dib.GetHeight();
 427     refData->m_depth = dib.GetDepth();
 428
 429     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 430
 431 #if wxUSE_PALETTE
 432     wxPalette *palette = dib.CreatePalette();
 433     if ( palette )
 434     {
 435         refData->m_bitmapPalette = *palette;
 436     }
 437
 438     delete palette;
 439 #endif // wxUSE_PALETTE
 440
 441     return true;
 442 }
 443
 444 #endif // NEVER_USE_DIB
 445
 446 wxBitmap::~wxBitmap()
 447 {
 448 }
 449
 450 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 451 {
 452 #ifndef __WXMICROWIN__
 453     wxBitmapRefData *refData = new wxBitmapRefData;
 454     m_refData = refData;
 455
 456     refData->m_width = width;
 457     refData->m_height = height;
 458     refData->m_depth = depth;
 459
 460     char *data;
 461     if ( depth == 1 )
 462     {
 463         // we assume that it is in XBM format which is not quite the same as
 464         // the format CreateBitmap() wants because the order of bytes in the
 465         // line is reversed!
 466         const size_t bytesPerLine = (width + 7) / 8;
 467         const size_t padding = bytesPerLine % 2;
 468         const size_t len = height * ( padding + bytesPerLine );
 469         data = (char *)malloc(len);
 470         const char *src = bits;
 471         char *dst = data;
 472
 473         for ( int rows = 0; rows < height; rows++ )
 474         {
 475             for ( size_t cols = 0; cols < bytesPerLine; cols++ )
 476             {
 477                 unsigned char val = *src++;
 478                 unsigned char reversed = 0;
 479
 480                 for ( int bits = 0; bits < 8; bits++)
 481                 {
 482                     reversed <<= 1;
 483                     reversed |= (unsigned char)(val & 0x01);
 484                     val >>= 1;
 485                 }
 486                 *dst++ = ~reversed;
 487             }
 488
 489             if ( padding )
 490                 *dst++ = 0;
 491         }
 492     }
 493     else
 494     {
 495         // bits should already be in Windows standard format
 496         data = const_cast<char *>(bits);
 497     }
 498
 499     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
 500     if ( !hbmp )
 501     {
 502         wxLogLastError(wxT("CreateBitmap"));
 503     }
 504
 505     if ( data != bits )
 506     {
 507         free(data);
 508     }
 509
 510     SetHBITMAP((WXHBITMAP)hbmp);
 511 #endif
 512 }
 513
 514 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
 515 {
 516     (void)Create(w, h, dc);
 517 }
 518
 519 wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
 520 {
 521     (void)Create(data, type, width, height, depth);
 522 }
 523
 524 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 525 {
 526     LoadFile(filename, type);
 527 }
 528
 529 bool wxBitmap::Create(int width, int height, int depth)
 530 {
 531     return DoCreate(width, height, depth, 0);
 532 }
 533
 534 bool wxBitmap::Create(int width, int height, const wxDC& dc)
 535 {
 536     wxCHECK_MSG( dc.IsOk(), false, wxT("invalid HDC in wxBitmap::Create()") );
 537
 538     const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
 539
 540     if (impl)
 541         return DoCreate(width, height, -1, impl->GetHDC());
 542     else
 543         return false;
 544 }
 545
 546 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
 547 {
 548     UnRef();
 549
 550     m_refData = new wxBitmapRefData;
 551
 552     GetBitmapData()->m_width = w;
 553     GetBitmapData()->m_height = h;
 554
 555     HBITMAP hbmp    wxDUMMY_INITIALIZE(0);
 556
 557 #ifndef NEVER_USE_DIB
 558     if ( wxShouldCreateDIB(w, h, d, hdc) )
 559     {
 560         if ( d == -1 )
 561         {
 562             // create DIBs without alpha channel by default
 563             d = 24;
 564         }
 565
 566         wxDIB dib(w, h, d);
 567         if ( !dib.IsOk() )
 568            return false;
 569
 570         // don't delete the DIB section in dib object dtor
 571         hbmp = dib.Detach();
 572
 573         GetBitmapData()->m_isDIB = true;
 574         GetBitmapData()->m_depth = d;
 575     }
 576     else // create a DDB
 577 #endif // NEVER_USE_DIB
 578     {
 579 #ifndef ALWAYS_USE_DIB
 580 #ifndef __WXMICROWIN__
 581         if ( d > 0 )
 582         {
 583             hbmp = ::CreateBitmap(w, h, 1, d, NULL);
 584             if ( !hbmp )
 585             {
 586                 wxLogLastError(wxT("CreateBitmap"));
 587             }
 588
 589             GetBitmapData()->m_depth = d;
 590         }
 591         else // d == 0, create bitmap compatible with the screen
 592 #endif // !__WXMICROWIN__
 593         {
 594             ScreenHDC dc;
 595             hbmp = ::CreateCompatibleBitmap(dc, w, h);
 596             if ( !hbmp )
 597             {
 598                 wxLogLastError(wxT("CreateCompatibleBitmap"));
 599             }
 600
 601             GetBitmapData()->m_depth = wxDisplayDepth();
 602         }
 603 #endif // !ALWAYS_USE_DIB
 604     }
 605
 606     SetHBITMAP((WXHBITMAP)hbmp);
 607
 608     return IsOk();
 609 }
 610
 611 #if wxUSE_IMAGE
 612
 613 // ----------------------------------------------------------------------------
 614 // wxImage to/from conversions for Microwin
 615 // ----------------------------------------------------------------------------
 616
 617 // Microwin versions are so different from normal ones that it really doesn't
 618 // make sense to use #ifdefs inside the function bodies
 619 #ifdef __WXMICROWIN__
 620
 621 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
 622 {
 623     // Set this to 1 to experiment with mask code,
 624     // which currently doesn't work
 625     #define USE_MASKS 0
 626
 627     m_refData = new wxBitmapRefData();
 628
 629     // Initial attempt at a simple-minded implementation.
 630     // The bitmap will always be created at the screen depth,
 631     // so the 'depth' argument is ignored.
 632
 633     HDC hScreenDC = ::GetDC(NULL);
 634     int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
 635
 636     HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
 637     HBITMAP hMaskBitmap = NULL;
 638     HBITMAP hOldMaskBitmap = NULL;
 639     HDC hMaskDC = NULL;
 640     unsigned char maskR = 0;
 641     unsigned char maskG = 0;
 642     unsigned char maskB = 0;
 643
 644     //    printf("Created bitmap %d\n", (int) hBitmap);
 645     if (hBitmap == NULL)
 646     {
 647         ::ReleaseDC(NULL, hScreenDC);
 648         return false;
 649     }
 650     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 651
 652     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 653     ::ReleaseDC(NULL, hScreenDC);
 654
 655     // created an mono-bitmap for the possible mask
 656     bool hasMask = image.HasMask();
 657
 658     if ( hasMask )
 659     {
 660 #if USE_MASKS
 661         // FIXME: we should be able to pass bpp = 1, but
 662         // GdBlit can't handle a different depth
 663 #if 0
 664         hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
 665 #else
 666         hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
 667 #endif
 668         maskR = image.GetMaskRed();
 669         maskG = image.GetMaskGreen();
 670         maskB = image.GetMaskBlue();
 671
 672         if (!hMaskBitmap)
 673         {
 674             hasMask = false;
 675         }
 676         else
 677         {
 678             hScreenDC = ::GetDC(NULL);
 679             hMaskDC = ::CreateCompatibleDC(hScreenDC);
 680            ::ReleaseDC(NULL, hScreenDC);
 681
 682             hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
 683         }
 684 #else
 685         hasMask = false;
 686 #endif
 687     }
 688
 689     int i, j;
 690     for (i = 0; i < image.GetWidth(); i++)
 691     {
 692         for (j = 0; j < image.GetHeight(); j++)
 693         {
 694             unsigned char red = image.GetRed(i, j);
 695             unsigned char green = image.GetGreen(i, j);
 696             unsigned char blue = image.GetBlue(i, j);
 697
 698             ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
 699
 700             if (hasMask)
 701             {
 702                 // scan the bitmap for the transparent colour and set the corresponding
 703                 // pixels in the mask to BLACK and the rest to WHITE
 704                 if (maskR == red && maskG == green && maskB == blue)
 705                     ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
 706                 else
 707                     ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
 708             }
 709         }
 710     }
 711
 712     ::SelectObject(hMemDC, hOldBitmap);
 713     ::DeleteDC(hMemDC);
 714     if (hasMask)
 715     {
 716         ::SelectObject(hMaskDC, hOldMaskBitmap);
 717         ::DeleteDC(hMaskDC);
 718
 719         ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
 720     }
 721
 722     SetWidth(image.GetWidth());
 723     SetHeight(image.GetHeight());
 724     SetDepth(screenDepth);
 725     SetHBITMAP( (WXHBITMAP) hBitmap );
 726
 727 #if wxUSE_PALETTE
 728     // Copy the palette from the source image
 729     SetPalette(image.GetPalette());
 730 #endif // wxUSE_PALETTE
 731
 732     return true;
 733 }
 734
 735 wxImage wxBitmap::ConvertToImage() const
 736 {
 737     // Initial attempt at a simple-minded implementation.
 738     // The bitmap will always be created at the screen depth,
 739     // so the 'depth' argument is ignored.
 740     // TODO: transparency (create a mask image)
 741
 742     if (!IsOk())
 743     {
 744         wxFAIL_MSG( wxT("bitmap is invalid") );
 745         return wxNullImage;
 746     }
 747
 748     wxImage image;
 749
 750     wxCHECK_MSG( IsOk(), wxNullImage, wxT("invalid bitmap") );
 751
 752     // create an wxImage object
 753     int width = GetWidth();
 754     int height = GetHeight();
 755     image.Create( width, height );
 756     unsigned char *data = image.GetData();
 757     if( !data )
 758     {
 759         wxFAIL_MSG( wxT("could not allocate data for image") );
 760         return wxNullImage;
 761     }
 762
 763     HDC hScreenDC = ::GetDC(NULL);
 764
 765     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 766     ::ReleaseDC(NULL, hScreenDC);
 767
 768     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 769
 770     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 771
 772     int i, j;
 773     for (i = 0; i < GetWidth(); i++)
 774     {
 775         for (j = 0; j < GetHeight(); j++)
 776         {
 777             COLORREF color = ::GetPixel(hMemDC, i, j);
 778             unsigned char red = GetRValue(color);
 779             unsigned char green = GetGValue(color);
 780             unsigned char blue = GetBValue(color);
 781
 782             image.SetRGB(i, j, red, green, blue);
 783         }
 784     }
 785
 786     ::SelectObject(hMemDC, hOldBitmap);
 787     ::DeleteDC(hMemDC);
 788
 789 #if wxUSE_PALETTE
 790     // Copy the palette from the source image
 791     if (GetPalette())
 792         image.SetPalette(* GetPalette());
 793 #endif // wxUSE_PALETTE
 794
 795     return image;
 796 }
 797
 798 #endif // __WXMICROWIN__
 799
 800 // ----------------------------------------------------------------------------
 801 // wxImage to/from conversions
 802 // ----------------------------------------------------------------------------
 803
 804 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 805 {
 806     return CreateFromImage(image, depth, 0);
 807 }
 808
 809 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
 810 {
 811     wxCHECK_MSG( dc.IsOk(), false,
 812                     wxT("invalid HDC in wxBitmap::CreateFromImage()") );
 813
 814     const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
 815
 816     if (impl)
 817         return CreateFromImage(image, -1, impl->GetHDC());
 818     else
 819         return false;
 820 }
 821
 822 #if wxUSE_WXDIB
 823
 824 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
 825 {
 826     wxCHECK_MSG( image.IsOk(), false, wxT("invalid image") );
 827
 828     UnRef();
 829
 830     // first convert the image to DIB
 831     const int h = image.GetHeight();
 832     const int w = image.GetWidth();
 833
 834     wxDIB dib(image);
 835     if ( !dib.IsOk() )
 836         return false;
 837
 838     const bool hasAlpha = image.HasAlpha();
 839
 840     if (depth == -1)
 841       depth = dib.GetDepth();
 842
 843     // store the bitmap parameters
 844     wxBitmapRefData * const refData = new wxBitmapRefData;
 845     refData->m_width = w;
 846     refData->m_height = h;
 847     refData->m_hasAlpha = hasAlpha;
 848     refData->m_depth = depth;
 849
 850     m_refData = refData;
 851
 852
 853     // next either store DIB as is or create a DDB from it
 854     HBITMAP hbitmap     wxDUMMY_INITIALIZE(0);
 855
 856     // are we going to use DIB?
 857     //
 858     // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
 859     if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
 860     {
 861         // don't delete the DIB section in dib object dtor
 862         hbitmap = dib.Detach();
 863
 864         refData->m_isDIB = true;
 865     }
 866 #ifndef ALWAYS_USE_DIB
 867     else // we need to convert DIB to DDB
 868     {
 869         hbitmap = dib.CreateDDB((HDC)hdc);
 870     }
 871 #endif // !ALWAYS_USE_DIB
 872
 873     // validate this object
 874     SetHBITMAP((WXHBITMAP)hbitmap);
 875
 876     // finally also set the mask if we have one
 877     if ( image.HasMask() )
 878     {
 879         const size_t len  = 2*((w+15)/16);
 880         BYTE *src  = image.GetData();
 881         BYTE *data = new BYTE[h*len];
 882         memset(data, 0, h*len);
 883         BYTE r = image.GetMaskRed(),
 884              g = image.GetMaskGreen(),
 885              b = image.GetMaskBlue();
 886         BYTE *dst = data;
 887         for ( int y = 0; y < h; y++, dst += len )
 888         {
 889             BYTE *dstLine = dst;
 890             BYTE mask = 0x80;
 891             for ( int x = 0; x < w; x++, src += 3 )
 892             {
 893                 if (src[0] != r || src[1] != g || src[2] != b)
 894                     *dstLine |= mask;
 895
 896                 if ( (mask >>= 1) == 0 )
 897                 {
 898                     dstLine++;
 899                     mask = 0x80;
 900                 }
 901             }
 902         }
 903
 904         hbitmap = ::CreateBitmap(w, h, 1, 1, data);
 905         if ( !hbitmap )
 906         {
 907             wxLogLastError(wxT("CreateBitmap(mask)"));
 908         }
 909         else
 910         {
 911             SetMask(new wxMask((WXHBITMAP)hbitmap));
 912         }
 913
 914         delete[] data;
 915     }
 916
 917     return true;
 918 }
 919
 920 wxImage wxBitmap::ConvertToImage() const
 921 {
 922     // convert DDB to DIB
 923     wxDIB dib(*this);
 924
 925     if ( !dib.IsOk() )
 926     {
 927         return wxNullImage;
 928     }
 929
 930     // and then DIB to our wxImage
 931     wxImage image = dib.ConvertToImage();
 932     if ( !image.IsOk() )
 933     {
 934         return wxNullImage;
 935     }
 936
 937     // now do the same for the mask, if we have any
 938     HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
 939     if ( hbmpMask )
 940     {
 941         wxDIB dibMask(hbmpMask);
 942         if ( dibMask.IsOk() )
 943         {
 944             // TODO: use wxRawBitmap to iterate over DIB
 945
 946             // we hard code the mask colour for now but we could also make an
 947             // effort (and waste time) to choose a colour not present in the
 948             // image already to avoid having to fudge the pixels below --
 949             // whether it's worth to do it is unclear however
 950             static const int MASK_RED = 1;
 951             static const int MASK_GREEN = 2;
 952             static const int MASK_BLUE = 3;
 953             static const int MASK_BLUE_REPLACEMENT = 2;
 954
 955             const int h = dibMask.GetHeight();
 956             const int w = dibMask.GetWidth();
 957             const int bpp = dibMask.GetDepth();
 958             const int maskBytesPerPixel = bpp >> 3;
 959             const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
 960             unsigned char *data = image.GetData();
 961
 962             // remember that DIBs are stored in bottom to top order
 963             unsigned char *
 964                 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
 965
 966             for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
 967             {
 968                 // traverse one mask DIB line
 969                 unsigned char *mask = maskLineStart;
 970                 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
 971                 {
 972                     // should this pixel be transparent?
 973                     if ( *mask )
 974                     {
 975                         // no, check that it isn't transparent by accident
 976                         if ( (data[0] == MASK_RED) &&
 977                                 (data[1] == MASK_GREEN) &&
 978                                     (data[2] == MASK_BLUE) )
 979                         {
 980                             // we have to fudge the colour a bit to prevent
 981                             // this pixel from appearing transparent
 982                             data[2] = MASK_BLUE_REPLACEMENT;
 983                         }
 984
 985                         data += 3;
 986                     }
 987                     else // yes, transparent pixel
 988                     {
 989                         *data++ = MASK_RED;
 990                         *data++ = MASK_GREEN;
 991                         *data++ = MASK_BLUE;
 992                     }
 993                 }
 994             }
 995
 996             image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
 997         }
 998     }
 999
1000     return image;
1001 }
1002
1003 #else // !wxUSE_WXDIB
1004
1005 bool
1006 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1007                           int WXUNUSED(depth),
1008                           WXHDC WXUNUSED(hdc))
1009 {
1010     return false;
1011 }
1012
1013 wxImage wxBitmap::ConvertToImage() const
1014 {
1015     return wxImage();
1016 }
1017
1018 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1019
1020 #endif // wxUSE_IMAGE
1021
1022 // ----------------------------------------------------------------------------
1023 // loading and saving bitmaps
1024 // ----------------------------------------------------------------------------
1025
1026 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
1027 {
1028     UnRef();
1029
1030     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1031
1032     if ( handler )
1033     {
1034         m_refData = new wxBitmapRefData;
1035
1036         return handler->LoadFile(this, filename, type, -1, -1);
1037     }
1038 #if wxUSE_IMAGE && wxUSE_WXDIB
1039     else // no bitmap handler found
1040     {
1041         wxImage image;
1042         if ( image.LoadFile( filename, type ) && image.IsOk() )
1043         {
1044             *this = wxBitmap(image);
1045
1046             return true;
1047         }
1048     }
1049 #endif // wxUSE_IMAGE
1050
1051     return false;
1052 }
1053
1054 bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
1055 {
1056     UnRef();
1057
1058     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1059
1060     if ( !handler )
1061     {
1062         wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1063
1064         return false;
1065     }
1066
1067     m_refData = new wxBitmapRefData;
1068
1069     return handler->Create(this, data, type, width, height, depth);
1070 }
1071
1072 bool wxBitmap::SaveFile(const wxString& filename,
1073                         wxBitmapType type,
1074                         const wxPalette *palette) const
1075 {
1076     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1077
1078     if ( handler )
1079     {
1080         return handler->SaveFile(this, filename, type, palette);
1081     }
1082 #if wxUSE_IMAGE && wxUSE_WXDIB
1083     else // no bitmap handler found
1084     {
1085         // FIXME what about palette? shouldn't we use it?
1086         wxImage image = ConvertToImage();
1087         if ( image.IsOk() )
1088         {
1089             return image.SaveFile(filename, type);
1090         }
1091     }
1092 #endif // wxUSE_IMAGE
1093
1094     return false;
1095 }
1096
1097 // ----------------------------------------------------------------------------
1098 // sub bitmap extraction
1099 // ----------------------------------------------------------------------------
1100 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1101 {
1102         MemoryHDC dcSrc;
1103         SelectInHDC selectSrc(dcSrc, GetHbitmap());
1104         return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1105 }
1106
1107 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1108 {
1109     wxCHECK_MSG( IsOk() &&
1110                  (rect.x >= 0) && (rect.y >= 0) &&
1111                  (rect.x+rect.width <= GetWidth()) &&
1112                  (rect.y+rect.height <= GetHeight()),
1113                  wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1114
1115     wxBitmap ret( rect.width, rect.height, GetDepth() );
1116     wxASSERT_MSG( ret.IsOk(), wxT("GetSubBitmap error") );
1117
1118 #ifndef __WXMICROWIN__
1119     // handle alpha channel, if any
1120     if (HasAlpha())
1121         ret.UseAlpha();
1122
1123     // copy bitmap data
1124     MemoryHDC dcSrc,
1125               dcDst;
1126
1127     {
1128         SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1129
1130         if ( !selectDst )
1131         {
1132             wxLogLastError(wxT("SelectObject(destBitmap)"));
1133         }
1134
1135         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1136                        (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1137         {
1138             wxLogLastError(wxT("BitBlt"));
1139         }
1140     }
1141
1142     // copy mask if there is one
1143     if ( GetMask() )
1144     {
1145         HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1146
1147         SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1148                     selectDst(dcDst, hbmpMask);
1149
1150         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1151                        dcSrc, rect.x, rect.y, SRCCOPY) )
1152         {
1153             wxLogLastError(wxT("BitBlt"));
1154         }
1155
1156         wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1157         ret.SetMask(mask);
1158     }
1159 #endif // !__WXMICROWIN__
1160
1161     return ret;
1162 }
1163
1164 // ----------------------------------------------------------------------------
1165 // wxBitmap accessors
1166 // ----------------------------------------------------------------------------
1167
1168 #if wxUSE_PALETTE
1169 wxPalette* wxBitmap::GetPalette() const
1170 {
1171     return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1172                            : NULL;
1173 }
1174 #endif
1175
1176 wxMask *wxBitmap::GetMask() const
1177 {
1178     return GetBitmapData() ? GetBitmapData()->GetMask() : NULL;
1179 }
1180
1181 wxBitmap wxBitmap::GetMaskBitmap() const
1182 {
1183     wxBitmap bmp;
1184     wxMask *mask = GetMask();
1185     if ( mask )
1186         bmp.SetHBITMAP(mask->GetMaskBitmap());
1187     return bmp;
1188 }
1189
1190 wxDC *wxBitmap::GetSelectedInto() const
1191 {
1192 #if wxDEBUG_LEVEL
1193     return GetBitmapData() ? GetBitmapData()->m_selectedInto : NULL;
1194 #else
1195     return NULL;
1196 #endif
1197 }
1198
1199 void wxBitmap::UseAlpha()
1200 {
1201     if ( GetBitmapData() )
1202         GetBitmapData()->m_hasAlpha = true;
1203 }
1204
1205 bool wxBitmap::HasAlpha() const
1206 {
1207     return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1208 }
1209
1210 // ----------------------------------------------------------------------------
1211 // wxBitmap setters
1212 // ----------------------------------------------------------------------------
1213
1214 void wxBitmap::SetSelectedInto(wxDC *dc)
1215 {
1216 #if wxDEBUG_LEVEL
1217     if ( GetBitmapData() )
1218         GetBitmapData()->m_selectedInto = dc;
1219 #else
1220     wxUnusedVar(dc);
1221 #endif
1222 }
1223
1224 #if wxUSE_PALETTE
1225
1226 void wxBitmap::SetPalette(const wxPalette& palette)
1227 {
1228     AllocExclusive();
1229
1230     GetBitmapData()->m_bitmapPalette = palette;
1231 }
1232
1233 #endif // wxUSE_PALETTE
1234
1235 void wxBitmap::SetMask(wxMask *mask)
1236 {
1237     AllocExclusive();
1238
1239     GetBitmapData()->SetMask(mask);
1240 }
1241
1242 // ----------------------------------------------------------------------------
1243 // raw bitmap access support
1244 // ----------------------------------------------------------------------------
1245
1246 #ifdef wxHAS_RAW_BITMAP
1247
1248 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1249 {
1250 #if wxUSE_WXDIB
1251     if ( !IsOk() )
1252     {
1253         // no bitmap, no data (raw or otherwise)
1254         return NULL;
1255     }
1256
1257     // if we're already a DIB we can access our data directly, but if not we
1258     // need to convert this DDB to a DIB section and use it for raw access and
1259     // then convert it back
1260     HBITMAP hDIB;
1261     if ( !GetBitmapData()->m_isDIB )
1262     {
1263         wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1264                         wxT("GetRawData() may be called only once") );
1265
1266         wxDIB *dib = new wxDIB(*this);
1267         if ( !dib->IsOk() )
1268         {
1269             delete dib;
1270
1271             return NULL;
1272         }
1273
1274         // we'll free it in UngetRawData()
1275         GetBitmapData()->m_dib = dib;
1276
1277         hDIB = dib->GetHandle();
1278     }
1279     else // we're a DIB
1280     {
1281         hDIB = GetHbitmap();
1282     }
1283
1284     DIBSECTION ds;
1285     if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1286     {
1287         wxFAIL_MSG( wxT("failed to get DIBSECTION from a DIB?") );
1288
1289         return NULL;
1290     }
1291
1292     // check that the bitmap is in correct format
1293     if ( ds.dsBm.bmBitsPixel != bpp )
1294     {
1295         wxFAIL_MSG( wxT("incorrect bitmap type in wxBitmap::GetRawData()") );
1296
1297         return NULL;
1298     }
1299
1300     // ok, store the relevant info in wxPixelDataBase
1301     const LONG h = ds.dsBm.bmHeight;
1302
1303     data.m_width = ds.dsBm.bmWidth;
1304     data.m_height = h;
1305
1306     // remember that DIBs are stored in top to bottom order!
1307     // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1308     // multiple of 2, as required by the documentation.  So we use the official
1309     // formula, which we already use elsewhere.)
1310     const LONG bytesPerRow =
1311         wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1312     data.m_stride = -bytesPerRow;
1313
1314     char *bits = (char *)ds.dsBm.bmBits;
1315     if ( h > 1 )
1316     {
1317         bits += (h - 1)*bytesPerRow;
1318     }
1319
1320     return bits;
1321 #else
1322     return NULL;
1323 #endif
1324 }
1325
1326 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1327 {
1328 #if wxUSE_WXDIB
1329     if ( !IsOk() )
1330         return;
1331
1332     if ( !&dataBase )
1333     {
1334         // invalid data, don't crash -- but don't assert neither as we're
1335         // called automatically from wxPixelDataBase dtor and so there is no
1336         // way to prevent this from happening
1337         return;
1338     }
1339
1340     // if we're a DDB we need to convert DIB back to DDB now to make the
1341     // changes made via raw bitmap access effective
1342     if ( !GetBitmapData()->m_isDIB )
1343     {
1344         wxDIB *dib = GetBitmapData()->m_dib;
1345         GetBitmapData()->m_dib = NULL;
1346
1347         // TODO: convert
1348
1349         delete dib;
1350     }
1351 #endif // wxUSE_WXDIB
1352 }
1353 #endif // wxHAS_RAW_BITMAP
1354
1355 // ----------------------------------------------------------------------------
1356 // wxMask
1357 // ----------------------------------------------------------------------------
1358
1359 wxMask::wxMask()
1360 {
1361     m_maskBitmap = 0;
1362 }
1363
1364 // Copy constructor
1365 wxMask::wxMask(const wxMask &mask)
1366       : wxObject()
1367 {
1368     BITMAP bmp;
1369
1370     HDC srcDC = CreateCompatibleDC(0);
1371     HDC destDC = CreateCompatibleDC(0);
1372
1373     // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1374     // so we'll use GetObject() API here:
1375     if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1376     {
1377         wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1378         return;
1379     }
1380
1381     // create our HBITMAP
1382     int w = bmp.bmWidth, h = bmp.bmHeight;
1383     m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1384
1385     // copy the mask's HBITMAP into our HBITMAP
1386     SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1387     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1388
1389     BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1390
1391     SelectObject(srcDC, 0);
1392     DeleteDC(srcDC);
1393     SelectObject(destDC, 0);
1394     DeleteDC(destDC);
1395 }
1396
1397 // Construct a mask from a bitmap and a colour indicating
1398 // the transparent area
1399 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1400 {
1401     m_maskBitmap = 0;
1402     Create(bitmap, colour);
1403 }
1404
1405 // Construct a mask from a bitmap and a palette index indicating
1406 // the transparent area
1407 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1408 {
1409     m_maskBitmap = 0;
1410     Create(bitmap, paletteIndex);
1411 }
1412
1413 // Construct a mask from a mono bitmap (copies the bitmap).
1414 wxMask::wxMask(const wxBitmap& bitmap)
1415 {
1416     m_maskBitmap = 0;
1417     Create(bitmap);
1418 }
1419
1420 wxMask::~wxMask()
1421 {
1422     if ( m_maskBitmap )
1423         ::DeleteObject((HBITMAP) m_maskBitmap);
1424 }
1425
1426 // Create a mask from a mono bitmap (copies the bitmap).
1427 bool wxMask::Create(const wxBitmap& bitmap)
1428 {
1429 #ifndef __WXMICROWIN__
1430     wxCHECK_MSG( bitmap.IsOk() && bitmap.GetDepth() == 1, false,
1431                  wxT("can't create mask from invalid or not monochrome bitmap") );
1432
1433     if ( m_maskBitmap )
1434     {
1435         ::DeleteObject((HBITMAP) m_maskBitmap);
1436         m_maskBitmap = 0;
1437     }
1438
1439     m_maskBitmap = (WXHBITMAP) CreateBitmap(
1440                                             bitmap.GetWidth(),
1441                                             bitmap.GetHeight(),
1442                                             1, 1, 0
1443                                            );
1444     HDC srcDC = CreateCompatibleDC(0);
1445     SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1446     HDC destDC = CreateCompatibleDC(0);
1447     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1448     BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1449     SelectObject(srcDC, 0);
1450     DeleteDC(srcDC);
1451     SelectObject(destDC, 0);
1452     DeleteDC(destDC);
1453     return true;
1454 #else
1455     wxUnusedVar(bitmap);
1456     return false;
1457 #endif
1458 }
1459
1460 // Create a mask from a bitmap and a palette index indicating
1461 // the transparent area
1462 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1463 {
1464     if ( m_maskBitmap )
1465     {
1466         ::DeleteObject((HBITMAP) m_maskBitmap);
1467         m_maskBitmap = 0;
1468     }
1469
1470 #if wxUSE_PALETTE
1471     if (bitmap.IsOk() && bitmap.GetPalette()->IsOk())
1472     {
1473         unsigned char red, green, blue;
1474         if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1475         {
1476             wxColour transparentColour(red, green, blue);
1477             return Create(bitmap, transparentColour);
1478         }
1479     }
1480 #endif // wxUSE_PALETTE
1481
1482     return false;
1483 }
1484
1485 // Create a mask from a bitmap and a colour indicating
1486 // the transparent area
1487 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1488 {
1489 #ifndef __WXMICROWIN__
1490     wxCHECK_MSG( bitmap.IsOk(), false, wxT("invalid bitmap in wxMask::Create") );
1491
1492     if ( m_maskBitmap )
1493     {
1494         ::DeleteObject((HBITMAP) m_maskBitmap);
1495         m_maskBitmap = 0;
1496     }
1497
1498     int width = bitmap.GetWidth(),
1499         height = bitmap.GetHeight();
1500
1501     // scan the bitmap for the transparent colour and set the corresponding
1502     // pixels in the mask to BLACK and the rest to WHITE
1503     COLORREF maskColour = wxColourToPalRGB(colour);
1504     m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1505
1506     HDC srcDC = ::CreateCompatibleDC(NULL);
1507     HDC destDC = ::CreateCompatibleDC(NULL);
1508     if ( !srcDC || !destDC )
1509     {
1510         wxLogLastError(wxT("CreateCompatibleDC"));
1511     }
1512
1513     bool ok = true;
1514
1515     // SelectObject() will fail
1516     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1517                   wxT("bitmap can't be selected in another DC") );
1518
1519     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1520     if ( !hbmpSrcOld )
1521     {
1522         wxLogLastError(wxT("SelectObject"));
1523
1524         ok = false;
1525     }
1526
1527     HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1528     if ( !hbmpDstOld )
1529     {
1530         wxLogLastError(wxT("SelectObject"));
1531
1532         ok = false;
1533     }
1534
1535     if ( ok )
1536     {
1537         // this will create a monochrome bitmap with 0 points for the pixels
1538         // which have the same value as the background colour and 1 for the
1539         // others
1540         ::SetBkColor(srcDC, maskColour);
1541         ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1542     }
1543
1544     ::SelectObject(srcDC, hbmpSrcOld);
1545     ::DeleteDC(srcDC);
1546     ::SelectObject(destDC, hbmpDstOld);
1547     ::DeleteDC(destDC);
1548
1549     return ok;
1550 #else // __WXMICROWIN__
1551     wxUnusedVar(bitmap);
1552     wxUnusedVar(colour);
1553     return false;
1554 #endif // __WXMICROWIN__/!__WXMICROWIN__
1555 }
1556
1557 // ----------------------------------------------------------------------------
1558 // wxBitmapHandler
1559 // ----------------------------------------------------------------------------
1560
1561 bool wxBitmapHandler::Create(wxGDIImage *image,
1562                              const void* data,
1563                              wxBitmapType type,
1564                              int width, int height, int depth)
1565 {
1566     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1567
1568     return bitmap && Create(bitmap, data, type, width, height, depth);
1569 }
1570
1571 bool wxBitmapHandler::Load(wxGDIImage *image,
1572                            const wxString& name,
1573                            wxBitmapType type,
1574                            int width, int height)
1575 {
1576     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1577
1578     return bitmap && LoadFile(bitmap, name, type, width, height);
1579 }
1580
1581 bool wxBitmapHandler::Save(const wxGDIImage *image,
1582                            const wxString& name,
1583                            wxBitmapType type) const
1584 {
1585     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1586
1587     return bitmap && SaveFile(bitmap, name, type);
1588 }
1589
1590 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1591                              const void* WXUNUSED(data),
1592                              wxBitmapType WXUNUSED(type),
1593                              int WXUNUSED(width),
1594                              int WXUNUSED(height),
1595                              int WXUNUSED(depth))
1596 {
1597     return false;
1598 }
1599
1600 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1601                                const wxString& WXUNUSED(name),
1602                                wxBitmapType WXUNUSED(type),
1603                                int WXUNUSED(desiredWidth),
1604                                int WXUNUSED(desiredHeight))
1605 {
1606     return false;
1607 }
1608
1609 bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap),
1610                                const wxString& WXUNUSED(name),
1611                                wxBitmapType WXUNUSED(type),
1612                                const wxPalette *WXUNUSED(palette)) const
1613 {
1614     return false;
1615 }
1616
1617 // ----------------------------------------------------------------------------
1618 // global helper functions implemented here
1619 // ----------------------------------------------------------------------------
1620
1621 // helper of wxBitmapToHICON/HCURSOR
1622 static
1623 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1624                              bool iconWanted,
1625                              int hotSpotX,
1626                              int hotSpotY)
1627 {
1628     if ( !bmp.IsOk() )
1629     {
1630         // we can't create an icon/cursor form nothing
1631         return 0;
1632     }
1633
1634     if ( bmp.HasAlpha() )
1635     {
1636         HBITMAP hbmp;
1637
1638 #if wxUSE_WXDIB && wxUSE_IMAGE
1639         // CreateIconIndirect() requires non-pre-multiplied pixel data on input
1640         // as it does pre-multiplication internally itself so we need to create
1641         // a special DIB in such format to pass to it. This is inefficient but
1642         // better than creating an icon with wrong colours.
1643         AutoHBITMAP hbmpRelease;
1644         hbmp = wxDIB(bmp.ConvertToImage(),
1645                      wxDIB::PixelFormat_NotPreMultiplied).Detach();
1646         hbmpRelease.Init(hbmp);
1647 #else // !(wxUSE_WXDIB && wxUSE_IMAGE)
1648         hbmp = GetHbitmapOf(bmp);
1649 #endif // wxUSE_WXDIB && wxUSE_IMAGE
1650
1651         // Create an empty mask bitmap.
1652         // it doesn't seem to work if we mess with the mask at all.
1653         AutoHBITMAP
1654             hMonoBitmap(CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL));
1655
1656         ICONINFO iconInfo;
1657         wxZeroMemory(iconInfo);
1658         iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1659         if ( !iconWanted )
1660         {
1661             iconInfo.xHotspot = hotSpotX;
1662             iconInfo.yHotspot = hotSpotY;
1663         }
1664
1665         iconInfo.hbmMask = hMonoBitmap;
1666         iconInfo.hbmColor = hbmp;
1667
1668         return ::CreateIconIndirect(&iconInfo);
1669     }
1670
1671     wxMask* mask = bmp.GetMask();
1672
1673     if ( !mask )
1674     {
1675         // we must have a mask for an icon, so even if it's probably incorrect,
1676         // do create it (grey is the "standard" transparent colour)
1677         mask = new wxMask(bmp, *wxLIGHT_GREY);
1678     }
1679
1680     ICONINFO iconInfo;
1681     wxZeroMemory(iconInfo);
1682     iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1683     if ( !iconWanted )
1684     {
1685         iconInfo.xHotspot = hotSpotX;
1686         iconInfo.yHotspot = hotSpotY;
1687     }
1688
1689     AutoHBITMAP hbmpMask(wxInvertMask((HBITMAP)mask->GetMaskBitmap()));
1690     iconInfo.hbmMask = hbmpMask;
1691     iconInfo.hbmColor = GetHbitmapOf(bmp);
1692
1693     // black out the transparent area to preserve background colour, because
1694     // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1695     // the mask to the dest rect.
1696     {
1697         MemoryHDC dcSrc, dcDst;
1698         SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1699                     selectBitmap(dcDst, iconInfo.hbmColor);
1700
1701         if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1702                        dcSrc, 0, 0, SRCAND) )
1703         {
1704             wxLogLastError(wxT("BitBlt"));
1705         }
1706     }
1707
1708     HICON hicon = ::CreateIconIndirect(&iconInfo);
1709
1710     if ( !bmp.GetMask() && !bmp.HasAlpha() )
1711     {
1712         // we created the mask, now delete it
1713         delete mask;
1714     }
1715
1716     return hicon;
1717 }
1718
1719 HICON wxBitmapToHICON(const wxBitmap& bmp)
1720 {
1721     return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1722 }
1723
1724 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1725 {
1726     return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1727 }
1728
1729 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1730 {
1731 #ifndef __WXMICROWIN__
1732     wxCHECK_MSG( hbmpMask, 0, wxT("invalid bitmap in wxInvertMask") );
1733
1734     // get width/height from the bitmap if not given
1735     if ( !w || !h )
1736     {
1737         BITMAP bm;
1738         ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1739         w = bm.bmWidth;
1740         h = bm.bmHeight;
1741     }
1742
1743     HDC hdcSrc = ::CreateCompatibleDC(NULL);
1744     HDC hdcDst = ::CreateCompatibleDC(NULL);
1745     if ( !hdcSrc || !hdcDst )
1746     {
1747         wxLogLastError(wxT("CreateCompatibleDC"));
1748     }
1749
1750     HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1751     if ( !hbmpInvMask )
1752     {
1753         wxLogLastError(wxT("CreateBitmap"));
1754     }
1755
1756     HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1757     HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1758     if ( !::BitBlt(hdcDst, 0, 0, w, h,
1759                    hdcSrc, 0, 0,
1760                    NOTSRCCOPY) )
1761     {
1762         wxLogLastError(wxT("BitBlt"));
1763     }
1764
1765     // Deselect objects
1766     SelectObject(hdcSrc,srcTmp);
1767     SelectObject(hdcDst,dstTmp);
1768
1769     ::DeleteDC(hdcSrc);
1770     ::DeleteDC(hdcDst);
1771
1772     return hbmpInvMask;
1773 #else
1774     return 0;
1775 #endif
1776 }