src/msw/bitmap.cpp

   1 ////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "bitmap.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include <stdio.h>
  33
  34     #include "wx/list.h"
  35     #include "wx/utils.h"
  36     #include "wx/app.h"
  37     #include "wx/palette.h"
  38     #include "wx/dcmemory.h"
  39     #include "wx/bitmap.h"
  40     #include "wx/icon.h"
  41 #endif
  42
  43 #include "wx/msw/private.h"
  44 #include "wx/log.h"
  45
  46 #if wxUSE_WXDIB
  47 #include "wx/msw/dib.h"
  48 #endif
  49
  50 #include "wx/image.h"
  51 #include "wx/xpmdecod.h"
  52
  53 #ifdef wxHAVE_RAW_BITMAP
  54 #include "wx/rawbmp.h"
  55 #endif
  56
  57 // missing from mingw32 header
  58 #ifndef CLR_INVALID
  59     #define CLR_INVALID ((COLORREF)-1)
  60 #endif // no CLR_INVALID
  61
  62 // ----------------------------------------------------------------------------
  63 // Bitmap data
  64 // ----------------------------------------------------------------------------
  65
  66 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
  67 {
  68 public:
  69     wxBitmapRefData();
  70     wxBitmapRefData(const wxBitmapRefData& data);
  71     virtual ~wxBitmapRefData() { Free(); }
  72
  73     virtual void Free();
  74
  75     // set the mask object to use as the mask, we take ownership of it
  76     void SetMask(wxMask *mask)
  77     {
  78         delete m_bitmapMask;
  79         m_bitmapMask = mask;
  80     }
  81
  82     // set the HBITMAP to use as the mask
  83     void SetMask(HBITMAP hbmpMask)
  84     {
  85         SetMask(new wxMask((WXHBITMAP)hbmpMask));
  86     }
  87
  88     // return the mask
  89     wxMask *GetMask() const { return m_bitmapMask; }
  90
  91 public:
  92 #if wxUSE_PALETTE
  93     wxPalette     m_bitmapPalette;
  94 #endif // wxUSE_PALETTE
  95
  96     // MSW-specific
  97     // ------------
  98
  99 #ifdef __WXDEBUG__
 100     // this field is solely for error checking: we detect selecting a bitmap
 101     // into more than one DC at once or deleting a bitmap still selected into a
 102     // DC (both are serious programming errors under Windows)
 103     wxDC         *m_selectedInto;
 104 #endif // __WXDEBUG__
 105
 106 #if wxUSE_WXDIB
 107     // when GetRawData() is called for a DDB we need to convert it to a DIB
 108     // first to be able to provide direct access to it and we cache that DIB
 109     // here and convert it back to DDB when UngetRawData() is called
 110     wxDIB *m_dib;
 111 #endif
 112
 113     // true if we have alpha transparency info and can be drawn using
 114     // AlphaBlend()
 115     bool m_hasAlpha;
 116
 117     // true if our HBITMAP is a DIB section, false if it is a DDB
 118     bool m_isDIB;
 119
 120 private:
 121     // optional mask for transparent drawing
 122     wxMask       *m_bitmapMask;
 123
 124
 125     // not implemented
 126     wxBitmapRefData& operator=(const wxBitmapRefData&);
 127 };
 128
 129 // ----------------------------------------------------------------------------
 130 // macros
 131 // ----------------------------------------------------------------------------
 132
 133 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
 134 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
 135
 136 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
 137
 138 // ============================================================================
 139 // implementation
 140 // ============================================================================
 141
 142 // ----------------------------------------------------------------------------
 143 // helper functions
 144 // ----------------------------------------------------------------------------
 145
 146 // decide whether we should create a DIB or a DDB for the given parameters
 147 //
 148 // NB: we always use DIBs under Windows CE as this is much simpler (even if
 149 //     also less efficient...) and we obviously can't use them if there is no
 150 //     DIB support compiled in at all
 151 #ifdef __WXWINCE__
 152     static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
 153
 154     #define ALWAYS_USE_DIB
 155 #elif !wxUSE_WXDIB
 156     // no sense in defining wxShouldCreateDIB() as we can't compile code
 157     // executed if it is true, so we have to use #if's anyhow
 158     #define NEVER_USE_DIB
 159 #else // wxUSE_WXDIB && !__WXWINCE__
 160     static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
 161     {
 162         // here is the logic:
 163         //
 164         //  (a) if hdc is specified, the caller explicitly wants DDB
 165         //  (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
 166         //      or less DIBs anyhow)
 167         //  (c) finally, create DIBs under Win9x even if the depth hasn't been
 168         //      explicitly specified but the current display depth is 24 or
 169         //      more and the image is "big", i.e. > 16Mb which is the
 170         //      theoretical limit for DDBs under Win9x
 171         //
 172         // consequences (all of which seem to make sense):
 173         //
 174         //  (i)     by default, DDBs are created (depth == -1 usually)
 175         //  (ii)    DIBs can be created by explicitly specifying the depth
 176         //  (iii)   using a DC always forces creating a DDB
 177         return !hdc &&
 178                 (d >= 24 ||
 179                     (d == -1 &&
 180                         wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
 181     }
 182
 183     #define SOMETIMES_USE_DIB
 184 #endif // different DIB usage scenarious
 185
 186 // ----------------------------------------------------------------------------
 187 // wxBitmapRefData
 188 // ----------------------------------------------------------------------------
 189
 190 wxBitmapRefData::wxBitmapRefData()
 191 {
 192 #ifdef __WXDEBUG__
 193     m_selectedInto = NULL;
 194 #endif
 195     m_bitmapMask = NULL;
 196
 197     m_hBitmap = (WXHBITMAP) NULL;
 198 #if wxUSE_WXDIB
 199     m_dib = NULL;
 200 #endif
 201
 202     m_isDIB =
 203     m_hasAlpha = FALSE;
 204 }
 205
 206 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
 207                : wxGDIImageRefData(data)
 208 {
 209 #ifdef __WXDEBUG__
 210     m_selectedInto = NULL;
 211 #endif
 212
 213     // can't copy the mask as the other bitmap destroys it
 214     m_bitmapMask = NULL;
 215
 216     wxASSERT_MSG( !data.m_isDIB,
 217                     _T("can't copy bitmap locked for raw access!") );
 218     m_isDIB = FALSE;
 219
 220     m_hasAlpha = data.m_hasAlpha;
 221 }
 222
 223 void wxBitmapRefData::Free()
 224 {
 225     wxASSERT_MSG( !m_selectedInto,
 226                   wxT("deleting bitmap still selected into wxMemoryDC") );
 227
 228 #if wxUSE_WXDIB
 229     wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
 230 #endif
 231
 232     if ( m_hBitmap)
 233     {
 234         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
 235         {
 236             wxLogLastError(wxT("DeleteObject(hbitmap)"));
 237         }
 238     }
 239
 240     delete m_bitmapMask;
 241     m_bitmapMask = NULL;
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // wxBitmap creation
 246 // ----------------------------------------------------------------------------
 247
 248 // this function should be called from all wxBitmap ctors
 249 void wxBitmap::Init()
 250 {
 251     // m_refData = NULL; done in the base class ctor
 252 }
 253
 254 wxGDIImageRefData *wxBitmap::CreateData() const
 255 {
 256     return new wxBitmapRefData;
 257 }
 258
 259 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
 260 {
 261     const wxBitmapRefData *
 262         data = wx_static_cast(const wxBitmapRefData *, dataOrig);
 263     if ( !data )
 264         return NULL;
 265
 266     wxBitmap *self = wx_const_cast(wxBitmap *, this);
 267     self->m_refData = new wxBitmapRefData(*data);
 268
 269 #if wxUSE_WXDIB
 270     // copy the other bitmap
 271     if ( data->m_hBitmap )
 272     {
 273         wxDIB dib((HBITMAP)(data->m_hBitmap));
 274         self->CopyFromDIB(dib);
 275     }
 276 #endif // wxUSE_WXDIB
 277
 278     return m_refData;
 279 }
 280
 281 #ifdef __WIN32__
 282
 283 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 284 {
 285 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 286     // it may be either HICON or HCURSOR
 287     HICON hicon = (HICON)icon.GetHandle();
 288
 289     ICONINFO iconInfo;
 290     if ( !::GetIconInfo(hicon, &iconInfo) )
 291     {
 292         wxLogLastError(wxT("GetIconInfo"));
 293
 294         return false;
 295     }
 296
 297     wxBitmapRefData *refData = new wxBitmapRefData;
 298     m_refData = refData;
 299
 300     int w = icon.GetWidth(),
 301         h = icon.GetHeight();
 302
 303     refData->m_width = w;
 304     refData->m_height = h;
 305     refData->m_depth = wxDisplayDepth();
 306
 307     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 308
 309     // the mask returned by GetIconInfo() is inversed compared to the usual
 310     // wxWin convention
 311     refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
 312
 313
 314     // delete the old one now as we don't need it any more
 315     ::DeleteObject(iconInfo.hbmMask);
 316
 317     return true;
 318 #else
 319     wxUnusedVar(icon);
 320     return false;
 321 #endif
 322 }
 323
 324 #endif // Win32
 325
 326 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
 327 {
 328     UnRef();
 329
 330     if ( !cursor.Ok() )
 331         return FALSE;
 332
 333     return CopyFromIconOrCursor(cursor);
 334 }
 335
 336 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 337 {
 338     UnRef();
 339
 340     if ( !icon.Ok() )
 341         return FALSE;
 342
 343     return CopyFromIconOrCursor(icon);
 344 }
 345
 346 #ifndef NEVER_USE_DIB
 347
 348 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
 349 {
 350     wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
 351
 352 #ifdef SOMETIMES_USE_DIB
 353     HBITMAP hbitmap = dib.CreateDDB();
 354     if ( !hbitmap )
 355         return FALSE;
 356 #else // ALWAYS_USE_DIB
 357     HBITMAP hbitmap = ((wxDIB &)dib).Detach();  // const_cast
 358 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
 359
 360     UnRef();
 361
 362     wxBitmapRefData *refData = new wxBitmapRefData;
 363     m_refData = refData;
 364
 365     refData->m_width = dib.GetWidth();
 366     refData->m_height = dib.GetHeight();
 367     refData->m_depth = dib.GetDepth();
 368
 369     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 370
 371 #if wxUSE_PALETTE
 372     wxPalette *palette = dib.CreatePalette();
 373     if ( palette )
 374     {
 375         refData->m_bitmapPalette = *palette;
 376     }
 377
 378     delete palette;
 379 #endif // wxUSE_PALETTE
 380
 381     return TRUE;
 382 }
 383
 384 #endif // NEVER_USE_DIB
 385
 386 wxBitmap::~wxBitmap()
 387 {
 388 }
 389
 390 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 391 {
 392     Init();
 393
 394 #ifndef __WXMICROWIN__
 395     wxBitmapRefData *refData = new wxBitmapRefData;
 396     m_refData = refData;
 397
 398     refData->m_width = width;
 399     refData->m_height = height;
 400     refData->m_depth = depth;
 401
 402     char *data;
 403     if ( depth == 1 )
 404     {
 405         // we assume that it is in XBM format which is not quite the same as
 406         // the format CreateBitmap() wants because the order of bytes in the
 407         // line is inversed!
 408         const size_t bytesPerLine = (width + 7) / 8;
 409         const size_t padding = bytesPerLine % 2;
 410         const size_t len = height * ( padding + bytesPerLine );
 411         data = (char *)malloc(len);
 412         const char *src = bits;
 413         char *dst = data;
 414
 415         for ( int rows = 0; rows < height; rows++ )
 416         {
 417             for ( size_t cols = 0; cols < bytesPerLine; cols++ )
 418             {
 419                 unsigned char val = *src++;
 420                 unsigned char reversed = 0;
 421
 422                 for ( int bits = 0; bits < 8; bits++)
 423                 {
 424                     reversed <<= 1;
 425                     reversed |= (val & 0x01);
 426                     val >>= 1;
 427                 }
 428                 *dst++ = reversed;
 429             }
 430
 431             if ( padding )
 432                 *dst++ = 0;
 433         }
 434     }
 435     else
 436     {
 437         // bits should already be in Windows standard format
 438         data = (char *)bits;    // const_cast is harmless
 439     }
 440
 441     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
 442     if ( !hbmp )
 443     {
 444         wxLogLastError(wxT("CreateBitmap"));
 445     }
 446
 447     if ( data != bits )
 448     {
 449         free(data);
 450     }
 451
 452     SetHBITMAP((WXHBITMAP)hbmp);
 453 #endif
 454 }
 455
 456 // Create from XPM data
 457 #if wxUSE_IMAGE && wxUSE_XPM
 458 bool wxBitmap::CreateFromXpm(const char **data)
 459 #else
 460 bool wxBitmap::CreateFromXpm(const char **WXUNUSED(data))
 461 #endif
 462 {
 463 #if wxUSE_IMAGE && wxUSE_XPM
 464     Init();
 465
 466     wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
 467
 468     wxXPMDecoder decoder;
 469     wxImage img = decoder.ReadData(data);
 470     wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
 471
 472     *this = wxBitmap(img);
 473     return TRUE;
 474 #else
 475     return FALSE;
 476 #endif
 477 }
 478
 479 wxBitmap::wxBitmap(int w, int h, int d)
 480 {
 481     Init();
 482
 483     (void)Create(w, h, d);
 484 }
 485
 486 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
 487 {
 488     Init();
 489
 490     (void)Create(w, h, dc);
 491 }
 492
 493 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
 494 {
 495     Init();
 496
 497     (void)Create(data, type, width, height, depth);
 498 }
 499
 500 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 501 {
 502     Init();
 503
 504     LoadFile(filename, (int)type);
 505 }
 506
 507 bool wxBitmap::Create(int width, int height, int depth)
 508 {
 509     return DoCreate(width, height, depth, 0);
 510 }
 511
 512 bool wxBitmap::Create(int width, int height, const wxDC& dc)
 513 {
 514     wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
 515
 516     return DoCreate(width, height, -1, dc.GetHDC());
 517 }
 518
 519 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
 520 {
 521     UnRef();
 522
 523     m_refData = new wxBitmapRefData;
 524
 525     GetBitmapData()->m_width = w;
 526     GetBitmapData()->m_height = h;
 527
 528     HBITMAP hbmp    wxDUMMY_INITIALIZE(0);
 529
 530 #ifndef NEVER_USE_DIB
 531     if ( wxShouldCreateDIB(w, h, d, hdc) )
 532     {
 533         if ( d == -1 )
 534         {
 535             // create DIBs without alpha channel by default
 536             d = 24;
 537         }
 538
 539         wxDIB dib(w, h, d);
 540         if ( !dib.IsOk() )
 541            return FALSE;
 542
 543         // don't delete the DIB section in dib object dtor
 544         hbmp = dib.Detach();
 545
 546         GetBitmapData()->m_isDIB = TRUE;
 547         GetBitmapData()->m_depth = d;
 548     }
 549     else // create a DDB
 550 #endif // NEVER_USE_DIB
 551     {
 552 #ifndef ALWAYS_USE_DIB
 553 #ifndef __WXMICROWIN__
 554         if ( d > 0 )
 555         {
 556             hbmp = ::CreateBitmap(w, h, 1, d, NULL);
 557             if ( !hbmp )
 558             {
 559                 wxLogLastError(wxT("CreateBitmap"));
 560             }
 561
 562             GetBitmapData()->m_depth = d;
 563         }
 564         else // d == 0, create bitmap compatible with the screen
 565 #endif // !__WXMICROWIN__
 566         {
 567             ScreenHDC dc;
 568             hbmp = ::CreateCompatibleBitmap(dc, w, h);
 569             if ( !hbmp )
 570             {
 571                 wxLogLastError(wxT("CreateCompatibleBitmap"));
 572             }
 573
 574             GetBitmapData()->m_depth = wxDisplayDepth();
 575         }
 576 #endif // !ALWAYS_USE_DIB
 577     }
 578
 579     SetHBITMAP((WXHBITMAP)hbmp);
 580
 581     return Ok();
 582 }
 583
 584 #if wxUSE_IMAGE
 585
 586 // ----------------------------------------------------------------------------
 587 // wxImage to/from conversions for Microwin
 588 // ----------------------------------------------------------------------------
 589
 590 // Microwin versions are so different from normal ones that it really doesn't
 591 // make sense to use #ifdefs inside the function bodies
 592 #ifdef __WXMICROWIN__
 593
 594 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
 595 {
 596     // Set this to 1 to experiment with mask code,
 597     // which currently doesn't work
 598     #define USE_MASKS 0
 599
 600     m_refData = new wxBitmapRefData();
 601
 602     // Initial attempt at a simple-minded implementation.
 603     // The bitmap will always be created at the screen depth,
 604     // so the 'depth' argument is ignored.
 605
 606     HDC hScreenDC = ::GetDC(NULL);
 607     int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
 608
 609     HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
 610     HBITMAP hMaskBitmap = NULL;
 611     HBITMAP hOldMaskBitmap = NULL;
 612     HDC hMaskDC = NULL;
 613     unsigned char maskR = 0;
 614     unsigned char maskG = 0;
 615     unsigned char maskB = 0;
 616
 617     //    printf("Created bitmap %d\n", (int) hBitmap);
 618     if (hBitmap == NULL)
 619     {
 620         ::ReleaseDC(NULL, hScreenDC);
 621         return FALSE;
 622     }
 623     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 624
 625     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 626     ::ReleaseDC(NULL, hScreenDC);
 627
 628     // created an mono-bitmap for the possible mask
 629     bool hasMask = image.HasMask();
 630
 631     if ( hasMask )
 632     {
 633 #if USE_MASKS
 634         // FIXME: we should be able to pass bpp = 1, but
 635         // GdBlit can't handle a different depth
 636 #if 0
 637         hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
 638 #else
 639         hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
 640 #endif
 641         maskR = image.GetMaskRed();
 642         maskG = image.GetMaskGreen();
 643         maskB = image.GetMaskBlue();
 644
 645         if (!hMaskBitmap)
 646         {
 647             hasMask = FALSE;
 648         }
 649         else
 650         {
 651             hScreenDC = ::GetDC(NULL);
 652             hMaskDC = ::CreateCompatibleDC(hScreenDC);
 653            ::ReleaseDC(NULL, hScreenDC);
 654
 655             hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
 656         }
 657 #else
 658         hasMask = FALSE;
 659 #endif
 660     }
 661
 662     int i, j;
 663     for (i = 0; i < image.GetWidth(); i++)
 664     {
 665         for (j = 0; j < image.GetHeight(); j++)
 666         {
 667             unsigned char red = image.GetRed(i, j);
 668             unsigned char green = image.GetGreen(i, j);
 669             unsigned char blue = image.GetBlue(i, j);
 670
 671             ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
 672
 673             if (hasMask)
 674             {
 675                 // scan the bitmap for the transparent colour and set the corresponding
 676                 // pixels in the mask to BLACK and the rest to WHITE
 677                 if (maskR == red && maskG == green && maskB == blue)
 678                     ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
 679                 else
 680                     ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
 681             }
 682         }
 683     }
 684
 685     ::SelectObject(hMemDC, hOldBitmap);
 686     ::DeleteDC(hMemDC);
 687     if (hasMask)
 688     {
 689         ::SelectObject(hMaskDC, hOldMaskBitmap);
 690         ::DeleteDC(hMaskDC);
 691
 692         ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
 693     }
 694
 695     SetWidth(image.GetWidth());
 696     SetHeight(image.GetHeight());
 697     SetDepth(screenDepth);
 698     SetHBITMAP( (WXHBITMAP) hBitmap );
 699
 700 #if wxUSE_PALETTE
 701     // Copy the palette from the source image
 702     SetPalette(image.GetPalette());
 703 #endif // wxUSE_PALETTE
 704
 705     return TRUE;
 706 }
 707
 708 wxImage wxBitmap::ConvertToImage() const
 709 {
 710     // Initial attempt at a simple-minded implementation.
 711     // The bitmap will always be created at the screen depth,
 712     // so the 'depth' argument is ignored.
 713     // TODO: transparency (create a mask image)
 714
 715     if (!Ok())
 716     {
 717         wxFAIL_MSG( wxT("bitmap is invalid") );
 718         return wxNullImage;
 719     }
 720
 721     wxImage image;
 722
 723     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 724
 725     // create an wxImage object
 726     int width = GetWidth();
 727     int height = GetHeight();
 728     image.Create( width, height );
 729     unsigned char *data = image.GetData();
 730     if( !data )
 731     {
 732         wxFAIL_MSG( wxT("could not allocate data for image") );
 733         return wxNullImage;
 734     }
 735
 736     HDC hScreenDC = ::GetDC(NULL);
 737
 738     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 739     ::ReleaseDC(NULL, hScreenDC);
 740
 741     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 742
 743     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 744
 745     int i, j;
 746     for (i = 0; i < GetWidth(); i++)
 747     {
 748         for (j = 0; j < GetHeight(); j++)
 749         {
 750             COLORREF color = ::GetPixel(hMemDC, i, j);
 751             unsigned char red = GetRValue(color);
 752             unsigned char green = GetGValue(color);
 753             unsigned char blue = GetBValue(color);
 754
 755             image.SetRGB(i, j, red, green, blue);
 756         }
 757     }
 758
 759     ::SelectObject(hMemDC, hOldBitmap);
 760     ::DeleteDC(hMemDC);
 761
 762 #if wxUSE_PALETTE
 763     // Copy the palette from the source image
 764     if (GetPalette())
 765         image.SetPalette(* GetPalette());
 766 #endif // wxUSE_PALETTE
 767
 768     return image;
 769 }
 770
 771 #endif // __WXMICROWIN__
 772
 773 // ----------------------------------------------------------------------------
 774 // wxImage to/from conversions
 775 // ----------------------------------------------------------------------------
 776
 777 #if wxUSE_WXDIB
 778
 779 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 780 {
 781     return CreateFromImage(image, depth, 0);
 782 }
 783
 784 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
 785 {
 786     wxCHECK_MSG( dc.Ok(), FALSE,
 787                     _T("invalid HDC in wxBitmap::CreateFromImage()") );
 788
 789     return CreateFromImage(image, -1, dc.GetHDC());
 790 }
 791
 792 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
 793 {
 794     wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
 795
 796     UnRef();
 797
 798     // first convert the image to DIB
 799     const int h = image.GetHeight();
 800     const int w = image.GetWidth();
 801
 802     wxDIB dib(image);
 803     if ( !dib.IsOk() )
 804         return FALSE;
 805
 806
 807     // store the bitmap parameters
 808     wxBitmapRefData *refData = new wxBitmapRefData;
 809     refData->m_width = w;
 810     refData->m_height = h;
 811     refData->m_hasAlpha = image.HasAlpha();
 812
 813     m_refData = refData;
 814
 815
 816     // next either store DIB as is or create a DDB from it
 817     HBITMAP hbitmap     wxDUMMY_INITIALIZE(0);
 818
 819     // are we going to use DIB?
 820     //
 821     // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
 822     if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
 823     {
 824         // don't delete the DIB section in dib object dtor
 825         hbitmap = dib.Detach();
 826
 827         refData->m_isDIB = TRUE;
 828         refData->m_depth = dib.GetDepth();
 829     }
 830 #ifndef ALWAYS_USE_DIB
 831     else // we need to convert DIB to DDB
 832     {
 833         hbitmap = dib.CreateDDB((HDC)hdc);
 834
 835         refData->m_depth = depth == -1 ? dib.GetDepth() : depth;
 836     }
 837 #endif // !ALWAYS_USE_DIB
 838
 839     // validate this object
 840     SetHBITMAP((WXHBITMAP)hbitmap);
 841
 842     // finally also set the mask if we have one
 843     if ( image.HasMask() )
 844     {
 845         SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
 846                                            image.GetMaskGreen(),
 847                                            image.GetMaskBlue())));
 848     }
 849
 850     return TRUE;
 851 }
 852
 853 wxImage wxBitmap::ConvertToImage() const
 854 {
 855     // convert DDB to DIB
 856     wxDIB dib(*this);
 857
 858     if ( !dib.IsOk() )
 859     {
 860         return wxNullImage;
 861     }
 862
 863     // and then DIB to our wxImage
 864     wxImage image = dib.ConvertToImage();
 865     if ( !image.Ok() )
 866     {
 867         return wxNullImage;
 868     }
 869
 870     // now do the same for the mask, if we have any
 871     HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
 872     if ( hbmpMask )
 873     {
 874         wxDIB dibMask(hbmpMask);
 875         if ( dibMask.IsOk() )
 876         {
 877             // TODO: use wxRawBitmap to iterate over DIB
 878
 879             // we hard code the mask colour for now but we could also make an
 880             // effort (and waste time) to choose a colour not present in the
 881             // image already to avoid having to fudge the pixels below --
 882             // whether it's worth to do it is unclear however
 883             static const int MASK_RED = 1;
 884             static const int MASK_GREEN = 2;
 885             static const int MASK_BLUE = 3;
 886             static const int MASK_BLUE_REPLACEMENT = 2;
 887
 888             const int h = dibMask.GetHeight();
 889             const int w = dibMask.GetWidth();
 890             const int bpp = dibMask.GetDepth();
 891             const int maskBytesPerPixel = bpp >> 3;
 892             const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
 893             unsigned char *data = image.GetData();
 894
 895             // remember that DIBs are stored in bottom to top order
 896             unsigned char *
 897                 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
 898
 899             for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
 900             {
 901                 // traverse one mask DIB line
 902                 unsigned char *mask = maskLineStart;
 903                 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
 904                 {
 905                     // should this pixel be transparent?
 906                     if ( *mask )
 907                     {
 908                         // no, check that it isn't transparent by accident
 909                         if ( (data[0] == MASK_RED) &&
 910                                 (data[1] == MASK_GREEN) &&
 911                                     (data[2] == MASK_BLUE) )
 912                         {
 913                             // we have to fudge the colour a bit to prevent
 914                             // this pixel from appearing transparent
 915                             data[2] = MASK_BLUE_REPLACEMENT;
 916                         }
 917
 918                         data += 3;
 919                     }
 920                     else // yes, transparent pixel
 921                     {
 922                         *data++ = MASK_RED;
 923                         *data++ = MASK_GREEN;
 924                         *data++ = MASK_BLUE;
 925                     }
 926                 }
 927             }
 928
 929             image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
 930         }
 931     }
 932
 933     return image;
 934 }
 935
 936 #endif // wxUSE_WXDIB
 937
 938 #endif // wxUSE_IMAGE
 939
 940 // ----------------------------------------------------------------------------
 941 // loading and saving bitmaps
 942 // ----------------------------------------------------------------------------
 943
 944 bool wxBitmap::LoadFile(const wxString& filename, long type)
 945 {
 946     UnRef();
 947
 948     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 949
 950     if ( handler )
 951     {
 952         m_refData = new wxBitmapRefData;
 953
 954         return handler->LoadFile(this, filename, type, -1, -1);
 955     }
 956 #if wxUSE_IMAGE
 957     else // no bitmap handler found
 958     {
 959         wxImage image;
 960         if ( image.LoadFile( filename, type ) && image.Ok() )
 961         {
 962             *this = wxBitmap(image);
 963
 964             return TRUE;
 965         }
 966     }
 967 #endif // wxUSE_IMAGE
 968
 969     return FALSE;
 970 }
 971
 972 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
 973 {
 974     UnRef();
 975
 976     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 977
 978     if ( !handler )
 979     {
 980         wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
 981
 982         return FALSE;
 983     }
 984
 985     m_refData = new wxBitmapRefData;
 986
 987     return handler->Create(this, data, type, width, height, depth);
 988 }
 989
 990 bool wxBitmap::SaveFile(const wxString& filename,
 991                         int type,
 992                         const wxPalette *palette)
 993 {
 994     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 995
 996     if ( handler )
 997     {
 998         return handler->SaveFile(this, filename, type, palette);
 999     }
1000 #if wxUSE_IMAGE
1001     else // no bitmap handler found
1002     {
1003         // FIXME what about palette? shouldn't we use it?
1004         wxImage image = ConvertToImage();
1005         if ( image.Ok() )
1006         {
1007             return image.SaveFile(filename, type);
1008         }
1009     }
1010 #endif // wxUSE_IMAGE
1011
1012     return FALSE;
1013 }
1014
1015 // ----------------------------------------------------------------------------
1016 // sub bitmap extraction
1017 // ----------------------------------------------------------------------------
1018
1019 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1020 {
1021     wxCHECK_MSG( Ok() &&
1022                  (rect.x >= 0) && (rect.y >= 0) &&
1023                  (rect.x+rect.width <= GetWidth()) &&
1024                  (rect.y+rect.height <= GetHeight()),
1025                  wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1026
1027     wxBitmap ret( rect.width, rect.height );
1028     wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1029
1030 #ifndef __WXMICROWIN__
1031     // TODO: copy alpha channel data if any
1032
1033     // copy bitmap data
1034     MemoryHDC dcSrc,
1035               dcDst;
1036
1037     {
1038         SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1039                     selectDst(dcDst, GetHbitmapOf(ret));
1040
1041         if ( !selectSrc || !selectDst )
1042         {
1043             wxLogLastError(_T("SelectObjct(hBitmap)"));
1044         }
1045
1046         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1047                        dcSrc, rect.x, rect.y, SRCCOPY) )
1048         {
1049             wxLogLastError(_T("BitBlt"));
1050         }
1051     }
1052
1053     // copy mask if there is one
1054     if ( GetMask() )
1055     {
1056         HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1057
1058         SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1059                     selectDst(dcDst, hbmpMask);
1060
1061         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1062                        dcSrc, rect.x, rect.y, SRCCOPY) )
1063         {
1064             wxLogLastError(_T("BitBlt"));
1065         }
1066
1067         wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1068         ret.SetMask(mask);
1069     }
1070 #endif // !__WXMICROWIN__
1071
1072     return ret;
1073 }
1074
1075 // ----------------------------------------------------------------------------
1076 // wxBitmap accessors
1077 // ----------------------------------------------------------------------------
1078
1079 #if wxUSE_PALETTE
1080 wxPalette* wxBitmap::GetPalette() const
1081 {
1082     return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1083                            : (wxPalette *) NULL;
1084 }
1085 #endif
1086
1087 wxMask *wxBitmap::GetMask() const
1088 {
1089     return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1090 }
1091
1092 #ifdef __WXDEBUG__
1093
1094 wxDC *wxBitmap::GetSelectedInto() const
1095 {
1096     return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1097 }
1098
1099 #endif
1100
1101 #if WXWIN_COMPATIBILITY_2_4
1102
1103 int wxBitmap::GetQuality() const
1104 {
1105     return 0;
1106 }
1107
1108 #endif // WXWIN_COMPATIBILITY_2_4
1109
1110 void wxBitmap::UseAlpha()
1111 {
1112     if ( GetBitmapData() )
1113         GetBitmapData()->m_hasAlpha = true;
1114 }
1115
1116 bool wxBitmap::HasAlpha() const
1117 {
1118     return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1119 }
1120
1121 // ----------------------------------------------------------------------------
1122 // wxBitmap setters
1123 // ----------------------------------------------------------------------------
1124
1125 #ifdef __WXDEBUG__
1126
1127 void wxBitmap::SetSelectedInto(wxDC *dc)
1128 {
1129     if ( GetBitmapData() )
1130         GetBitmapData()->m_selectedInto = dc;
1131 }
1132
1133 #endif
1134
1135 #if wxUSE_PALETTE
1136
1137 void wxBitmap::SetPalette(const wxPalette& palette)
1138 {
1139     AllocExclusive();
1140
1141     GetBitmapData()->m_bitmapPalette = palette;
1142 }
1143
1144 #endif // wxUSE_PALETTE
1145
1146 void wxBitmap::SetMask(wxMask *mask)
1147 {
1148     AllocExclusive();
1149
1150     GetBitmapData()->SetMask(mask);
1151 }
1152
1153 #if WXWIN_COMPATIBILITY_2_4
1154
1155 void wxBitmap::SetQuality(int WXUNUSED(quality))
1156 {
1157 }
1158
1159 #endif // WXWIN_COMPATIBILITY_2_4
1160
1161 // ----------------------------------------------------------------------------
1162 // raw bitmap access support
1163 // ----------------------------------------------------------------------------
1164
1165 #ifdef wxHAVE_RAW_BITMAP
1166 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1167 {
1168 #if wxUSE_WXDIB
1169     if ( !Ok() )
1170     {
1171         // no bitmap, no data (raw or otherwise)
1172         return NULL;
1173     }
1174
1175     // if we're already a DIB we can access our data directly, but if not we
1176     // need to convert this DDB to a DIB section and use it for raw access and
1177     // then convert it back
1178     HBITMAP hDIB;
1179     if ( !GetBitmapData()->m_isDIB )
1180     {
1181         wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
1182                         _T("GetRawData() may be called only once") );
1183
1184         wxDIB *dib = new wxDIB(*this);
1185         if ( !dib->IsOk() )
1186         {
1187             delete dib;
1188
1189             return NULL;
1190         }
1191
1192         // we'll free it in UngetRawData()
1193         GetBitmapData()->m_dib = dib;
1194
1195         hDIB = dib->GetHandle();
1196     }
1197     else // we're a DIB
1198     {
1199         hDIB = GetHbitmap();
1200     }
1201
1202     DIBSECTION ds;
1203     if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1204     {
1205         wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1206
1207         return NULL;
1208     }
1209
1210     // check that the bitmap is in correct format
1211     if ( ds.dsBm.bmBitsPixel != bpp )
1212     {
1213         wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1214
1215         return NULL;
1216     }
1217
1218     // ok, store the relevant info in wxPixelDataBase
1219     const LONG h = ds.dsBm.bmHeight;
1220
1221     data.m_width = ds.dsBm.bmWidth;
1222     data.m_height = h;
1223
1224     // remember that DIBs are stored in top to bottom order!
1225     const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1226     data.m_stride = -bytesPerRow;
1227
1228     char *bits = (char *)ds.dsBm.bmBits;
1229     if ( h > 1 )
1230     {
1231         bits += (h - 1)*bytesPerRow;
1232     }
1233
1234     return bits;
1235 #else
1236     return NULL;
1237 #endif
1238 }
1239
1240 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1241 {
1242 #if wxUSE_WXDIB
1243     if ( !Ok() )
1244         return;
1245
1246     // the cast is ugly but we can't do without it and without making this
1247     // function template (and hence inline) unfortunately
1248     typedef wxPixelData<wxBitmap, wxAlphaPixelFormat> PixelData;
1249     PixelData& data = (PixelData &)dataBase;
1250
1251     if ( !data )
1252     {
1253         // invalid data, don't crash -- but don't assert neither as we're
1254         // called automatically from wxPixelDataBase dtor and so there is no
1255         // way to prevent this from happening
1256         return;
1257     }
1258
1259     if ( GetBitmapData()->m_hasAlpha )
1260     {
1261         // AlphaBlend() wants to have premultiplied source alpha but
1262         // wxRawBitmap API uses normal, not premultiplied, colours, so adjust
1263         // them here now
1264         PixelData::Iterator p(data);
1265
1266         const int w = data.GetWidth();
1267         const int h = data.GetHeight();
1268
1269         for ( int y = 0; y < h; y++ )
1270         {
1271             PixelData::Iterator rowStart = p;
1272
1273             for ( int x = 0; x < w; x++ )
1274             {
1275                 const unsigned alpha = p.Alpha();
1276
1277                 p.Red() = (p.Red() * alpha + 127) / 255;
1278                 p.Blue() = (p.Blue() * alpha + 127) / 255;
1279                 p.Green() = (p.Green() * alpha + 127) / 255;
1280
1281                 ++p;
1282             }
1283
1284             p = rowStart;
1285             p.OffsetY(data, 1);
1286         }
1287     }
1288
1289     // if we're a DDB we need to convert DIB back to DDB now to make the
1290     // changes made via raw bitmap access effective
1291     if ( !GetBitmapData()->m_isDIB )
1292     {
1293         wxDIB *dib = GetBitmapData()->m_dib;
1294         GetBitmapData()->m_dib = NULL;
1295
1296         // TODO: convert
1297
1298         delete dib;
1299     }
1300 #endif // wxUSE_WXDIB
1301 }
1302 #endif // #ifdef wxHAVE_RAW_BITMAP
1303
1304 // ----------------------------------------------------------------------------
1305 // wxMask
1306 // ----------------------------------------------------------------------------
1307
1308 wxMask::wxMask()
1309 {
1310     m_maskBitmap = 0;
1311 }
1312
1313 // Construct a mask from a bitmap and a colour indicating
1314 // the transparent area
1315 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1316 {
1317     m_maskBitmap = 0;
1318     Create(bitmap, colour);
1319 }
1320
1321 // Construct a mask from a bitmap and a palette index indicating
1322 // the transparent area
1323 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1324 {
1325     m_maskBitmap = 0;
1326     Create(bitmap, paletteIndex);
1327 }
1328
1329 // Construct a mask from a mono bitmap (copies the bitmap).
1330 wxMask::wxMask(const wxBitmap& bitmap)
1331 {
1332     m_maskBitmap = 0;
1333     Create(bitmap);
1334 }
1335
1336 wxMask::~wxMask()
1337 {
1338     if ( m_maskBitmap )
1339         ::DeleteObject((HBITMAP) m_maskBitmap);
1340 }
1341
1342 // Create a mask from a mono bitmap (copies the bitmap).
1343 bool wxMask::Create(const wxBitmap& bitmap)
1344 {
1345 #ifndef __WXMICROWIN__
1346     wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1347                  _T("can't create mask from invalid or not monochrome bitmap") );
1348
1349     if ( m_maskBitmap )
1350     {
1351         ::DeleteObject((HBITMAP) m_maskBitmap);
1352         m_maskBitmap = 0;
1353     }
1354
1355     m_maskBitmap = (WXHBITMAP) CreateBitmap(
1356                                             bitmap.GetWidth(),
1357                                             bitmap.GetHeight(),
1358                                             1, 1, 0
1359                                            );
1360     HDC srcDC = CreateCompatibleDC(0);
1361     SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1362     HDC destDC = CreateCompatibleDC(0);
1363     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1364     BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1365     SelectObject(srcDC, 0);
1366     DeleteDC(srcDC);
1367     SelectObject(destDC, 0);
1368     DeleteDC(destDC);
1369     return TRUE;
1370 #else
1371     return FALSE;
1372 #endif
1373 }
1374
1375 // Create a mask from a bitmap and a palette index indicating
1376 // the transparent area
1377 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1378 {
1379     if ( m_maskBitmap )
1380     {
1381         ::DeleteObject((HBITMAP) m_maskBitmap);
1382         m_maskBitmap = 0;
1383     }
1384
1385 #if wxUSE_PALETTE
1386     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1387     {
1388         unsigned char red, green, blue;
1389         if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1390         {
1391             wxColour transparentColour(red, green, blue);
1392             return Create(bitmap, transparentColour);
1393         }
1394     }
1395 #endif // wxUSE_PALETTE
1396
1397     return FALSE;
1398 }
1399
1400 // Create a mask from a bitmap and a colour indicating
1401 // the transparent area
1402 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1403 {
1404 #ifndef __WXMICROWIN__
1405     wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1406
1407     if ( m_maskBitmap )
1408     {
1409         ::DeleteObject((HBITMAP) m_maskBitmap);
1410         m_maskBitmap = 0;
1411     }
1412
1413     int width = bitmap.GetWidth(),
1414         height = bitmap.GetHeight();
1415
1416     // scan the bitmap for the transparent colour and set the corresponding
1417     // pixels in the mask to BLACK and the rest to WHITE
1418     COLORREF maskColour = wxColourToPalRGB(colour);
1419     m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1420
1421     HDC srcDC = ::CreateCompatibleDC(NULL);
1422     HDC destDC = ::CreateCompatibleDC(NULL);
1423     if ( !srcDC || !destDC )
1424     {
1425         wxLogLastError(wxT("CreateCompatibleDC"));
1426     }
1427
1428     bool ok = TRUE;
1429
1430     // SelectObject() will fail
1431     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1432                   _T("bitmap can't be selected in another DC") );
1433
1434     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1435     if ( !hbmpSrcOld )
1436     {
1437         wxLogLastError(wxT("SelectObject"));
1438
1439         ok = FALSE;
1440     }
1441
1442     HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1443     if ( !hbmpDstOld )
1444     {
1445         wxLogLastError(wxT("SelectObject"));
1446
1447         ok = FALSE;
1448     }
1449
1450     if ( ok )
1451     {
1452         // this will create a monochrome bitmap with 0 points for the pixels
1453         // which have the same value as the background colour and 1 for the
1454         // others
1455         ::SetBkColor(srcDC, maskColour);
1456         ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1457     }
1458
1459     ::SelectObject(srcDC, hbmpSrcOld);
1460     ::DeleteDC(srcDC);
1461     ::SelectObject(destDC, hbmpDstOld);
1462     ::DeleteDC(destDC);
1463
1464     return ok;
1465 #else // __WXMICROWIN__
1466     return FALSE;
1467 #endif // __WXMICROWIN__/!__WXMICROWIN__
1468 }
1469
1470 // ----------------------------------------------------------------------------
1471 // wxBitmapHandler
1472 // ----------------------------------------------------------------------------
1473
1474 bool wxBitmapHandler::Create(wxGDIImage *image,
1475                              void *data,
1476                              long flags,
1477                              int width, int height, int depth)
1478 {
1479     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1480
1481     return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1482 }
1483
1484 bool wxBitmapHandler::Load(wxGDIImage *image,
1485                            const wxString& name,
1486                            long flags,
1487                            int width, int height)
1488 {
1489     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1490
1491     return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1492 }
1493
1494 bool wxBitmapHandler::Save(wxGDIImage *image,
1495                            const wxString& name,
1496                            int type)
1497 {
1498     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1499
1500     return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1501 }
1502
1503 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1504                              void *WXUNUSED(data),
1505                              long WXUNUSED(type),
1506                              int WXUNUSED(width),
1507                              int WXUNUSED(height),
1508                              int WXUNUSED(depth))
1509 {
1510     return FALSE;
1511 }
1512
1513 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1514                                const wxString& WXUNUSED(name),
1515                                long WXUNUSED(type),
1516                                int WXUNUSED(desiredWidth),
1517                                int WXUNUSED(desiredHeight))
1518 {
1519     return FALSE;
1520 }
1521
1522 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1523                                const wxString& WXUNUSED(name),
1524                                int WXUNUSED(type),
1525                                const wxPalette *WXUNUSED(palette))
1526 {
1527     return FALSE;
1528 }
1529
1530 // ----------------------------------------------------------------------------
1531 // DIB functions
1532 // ----------------------------------------------------------------------------
1533
1534 #ifndef __WXMICROWIN__
1535 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1536                  HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1537 {
1538    unsigned long   i, headerSize;
1539
1540    // Allocate space for a DIB header
1541    headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1542    LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1543    LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1544
1545    GetPaletteEntries(hPal, 0, 256, lpPe);
1546
1547    memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1548
1549    // Fill in the static parts of the DIB header
1550    lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1551    lpDIBheader->bmiHeader.biWidth = xSize;
1552    lpDIBheader->bmiHeader.biHeight = ySize;
1553    lpDIBheader->bmiHeader.biPlanes = 1;
1554
1555    // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1556    lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1557    lpDIBheader->bmiHeader.biCompression = BI_RGB;
1558    lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1559    lpDIBheader->bmiHeader.biClrUsed = 256;
1560
1561
1562    // Initialize the DIB palette
1563    for (i = 0; i < 256; i++) {
1564       lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1565       lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1566       lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1567       lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1568    }
1569
1570    *lpDIBHeader = lpDIBheader;
1571
1572    return TRUE;
1573 }
1574
1575 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1576 {
1577     free(lpDIBHeader);
1578 }
1579 #endif
1580
1581 // ----------------------------------------------------------------------------
1582 // global helper functions implemented here
1583 // ----------------------------------------------------------------------------
1584
1585 // helper of wxBitmapToHICON/HCURSOR
1586 static
1587 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1588                              bool iconWanted,
1589                              int hotSpotX,
1590                              int hotSpotY)
1591 {
1592     if ( !bmp.Ok() )
1593     {
1594         // we can't create an icon/cursor form nothing
1595         return 0;
1596     }
1597
1598     wxMask *mask = bmp.GetMask();
1599     if ( !mask )
1600     {
1601         // we must have a mask for an icon, so even if it's probably incorrect,
1602         // do create it (grey is the "standard" transparent colour)
1603         mask = new wxMask(bmp, *wxLIGHT_GREY);
1604     }
1605
1606     ICONINFO iconInfo;
1607     wxZeroMemory(iconInfo);
1608     iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1609     if ( !iconWanted )
1610     {
1611         iconInfo.xHotspot = hotSpotX;
1612         iconInfo.yHotspot = hotSpotY;
1613     }
1614
1615     iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1616     iconInfo.hbmColor = GetHbitmapOf(bmp);
1617
1618     // black out the transparent area to preserve background colour, because
1619     // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1620     // the mask to the dest rect.
1621     {
1622         MemoryHDC dcSrc, dcDst;
1623         SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1624                     selectBitmap(dcDst, iconInfo.hbmColor);
1625
1626         if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1627                        dcSrc, 0, 0, SRCAND) )
1628         {
1629             wxLogLastError(_T("BitBlt"));
1630         }
1631     }
1632
1633     HICON hicon = ::CreateIconIndirect(&iconInfo);
1634
1635     if ( !bmp.GetMask() )
1636     {
1637         // we created the mask, now delete it
1638         delete mask;
1639     }
1640
1641     // delete the inverted mask bitmap we created as well
1642     ::DeleteObject(iconInfo.hbmMask);
1643
1644     return hicon;
1645 }
1646
1647 HICON wxBitmapToHICON(const wxBitmap& bmp)
1648 {
1649     return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1650 }
1651
1652 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1653 {
1654     return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1655 }
1656
1657 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1658 {
1659 #ifndef __WXMICROWIN__
1660     wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1661
1662     // get width/height from the bitmap if not given
1663     if ( !w || !h )
1664     {
1665         BITMAP bm;
1666         ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1667         w = bm.bmWidth;
1668         h = bm.bmHeight;
1669     }
1670
1671     HDC hdcSrc = ::CreateCompatibleDC(NULL);
1672     HDC hdcDst = ::CreateCompatibleDC(NULL);
1673     if ( !hdcSrc || !hdcDst )
1674     {
1675         wxLogLastError(wxT("CreateCompatibleDC"));
1676     }
1677
1678     HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1679     if ( !hbmpInvMask )
1680     {
1681         wxLogLastError(wxT("CreateBitmap"));
1682     }
1683
1684     HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1685     HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1686     if ( !::BitBlt(hdcDst, 0, 0, w, h,
1687                    hdcSrc, 0, 0,
1688                    NOTSRCCOPY) )
1689     {
1690         wxLogLastError(wxT("BitBlt"));
1691     }
1692
1693     // Deselect objects
1694     SelectObject(hdcSrc,srcTmp);
1695     SelectObject(hdcDst,dstTmp);
1696
1697     ::DeleteDC(hdcSrc);
1698     ::DeleteDC(hdcDst);
1699
1700     return hbmpInvMask;
1701 #else
1702     return 0;
1703 #endif
1704 }