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