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 #ifdef __GNUG__
  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 !defined(__WXMICROWIN__)
  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     virtual ~wxBitmapRefData() { Free(); }
  71
  72     virtual void Free();
  73
  74     // set the mask object to use as the mask, we take ownership of it
  75     void SetMask(wxMask *mask)
  76     {
  77         delete m_bitmapMask;
  78         m_bitmapMask = mask;
  79     }
  80
  81     // set the HBITMAP to use as the mask
  82     void SetMask(HBITMAP hbmpMask)
  83     {
  84         SetMask(new wxMask((WXHBITMAP)hbmpMask));
  85     }
  86
  87     // return the mask
  88     wxMask *GetMask() const { return m_bitmapMask; }
  89
  90 public:
  91 #if wxUSE_PALETTE
  92     wxPalette     m_bitmapPalette;
  93 #endif // wxUSE_PALETTE
  94
  95     // MSW-specific
  96     // ------------
  97
  98 #ifdef __WXDEBUG__
  99     // this field is solely for error checking: we detect selecting a bitmap
 100     // into more than one DC at once or deleting a bitmap still selected into a
 101     // DC (both are serious programming errors under Windows)
 102     wxDC         *m_selectedInto;
 103 #endif // __WXDEBUG__
 104
 105     // when GetRawData() is called for a DDB we need to convert it to a DIB
 106     // first to be able to provide direct access to it and we cache that DIB
 107     // here and convert it back to DDB when UngetRawData() is called
 108     wxDIB *m_dib;
 109
 110     // true if we have alpha transparency info and can be drawn using
 111     // AlphaBlend()
 112     bool m_hasAlpha;
 113
 114     // true if our HBITMAP is a DIB section, false if it is a DDB
 115     bool m_isDIB;
 116
 117 private:
 118     // optional mask for transparent drawing
 119     wxMask       *m_bitmapMask;
 120
 121     DECLARE_NO_COPY_CLASS(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 static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
 143 {
 144     // here is the logic:
 145     //
 146     //  (a) if hdc is specified, the caller explicitly wants DDB
 147     //  (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
 148     //      less DIBs anyhow)
 149     //  (c) finally, create DIBs under Win9x even if the depth hasn't been
 150     //      explicitly specified but the current display depth is 24 or more
 151     //      and the image is "big", i.e. > 16Mb which is the theoretical limit
 152     //      for DDBs under Win9x
 153     //
 154     // consequences (all of which seem to make sense):
 155     //
 156     //  (i)     by default, DDBs are created (depth == -1 usually)
 157     //  (ii)    DIBs can be created by explicitly specifying the depth
 158     //  (iii)   using a DC always forces creating a DDB
 159     return !hdc &&
 160             (d >= 24 ||
 161                 (d == -1 &&
 162                     wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
 163 }
 164
 165 // ----------------------------------------------------------------------------
 166 // wxBitmapRefData
 167 // ----------------------------------------------------------------------------
 168
 169 wxBitmapRefData::wxBitmapRefData()
 170 {
 171 #ifdef __WXDEBUG__
 172     m_selectedInto = NULL;
 173 #endif
 174     m_bitmapMask = NULL;
 175
 176     m_hBitmap = (WXHBITMAP) NULL;
 177     m_dib = NULL;
 178
 179     m_isDIB =
 180     m_hasAlpha = FALSE;
 181 }
 182
 183 void wxBitmapRefData::Free()
 184 {
 185     wxASSERT_MSG( !m_selectedInto,
 186                   wxT("deleting bitmap still selected into wxMemoryDC") );
 187
 188     wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
 189
 190     if ( m_hBitmap)
 191     {
 192         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
 193         {
 194             wxLogLastError(wxT("DeleteObject(hbitmap)"));
 195         }
 196     }
 197
 198     delete m_bitmapMask;
 199     m_bitmapMask = NULL;
 200 }
 201
 202 // ----------------------------------------------------------------------------
 203 // wxBitmap creation
 204 // ----------------------------------------------------------------------------
 205
 206 // this function should be called from all wxBitmap ctors
 207 void wxBitmap::Init()
 208 {
 209     // m_refData = NULL; done in the base class ctor
 210 }
 211
 212 wxGDIImageRefData *wxBitmap::CreateData() const
 213 {
 214     return new wxBitmapRefData;
 215 }
 216
 217 #ifdef __WIN32__
 218
 219 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 220 {
 221 #ifndef __WXMICROWIN__
 222     // it may be either HICON or HCURSOR
 223     HICON hicon = (HICON)icon.GetHandle();
 224
 225     ICONINFO iconInfo;
 226     if ( !::GetIconInfo(hicon, &iconInfo) )
 227     {
 228         wxLogLastError(wxT("GetIconInfo"));
 229
 230         return FALSE;
 231     }
 232
 233     wxBitmapRefData *refData = new wxBitmapRefData;
 234     m_refData = refData;
 235
 236     int w = icon.GetWidth(),
 237         h = icon.GetHeight();
 238
 239     refData->m_width = w;
 240     refData->m_height = h;
 241     refData->m_depth = wxDisplayDepth();
 242
 243     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 244
 245     // the mask returned by GetIconInfo() is inversed compared to the usual
 246     // wxWin convention
 247     refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
 248
 249
 250     // delete the old one now as we don't need it any more
 251     ::DeleteObject(iconInfo.hbmMask);
 252
 253 #if WXWIN_COMPATIBILITY_2
 254     refData->m_ok = TRUE;
 255 #endif // WXWIN_COMPATIBILITY_2
 256
 257     return TRUE;
 258 #else
 259     return FALSE;
 260 #endif
 261 }
 262
 263 #endif // Win32
 264
 265 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
 266 {
 267     UnRef();
 268
 269     if ( !cursor.Ok() )
 270         return FALSE;
 271
 272 #ifdef __WIN16__
 273     wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
 274
 275     return FALSE;
 276 #else
 277     return CopyFromIconOrCursor(cursor);
 278 #endif // Win16
 279 }
 280
 281 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 282 {
 283     UnRef();
 284
 285     if ( !icon.Ok() )
 286         return FALSE;
 287
 288     // GetIconInfo() doesn't exist under Win16 and I don't know any other way
 289     // to create a bitmap from icon there - but using this way we won't have
 290     // the mask (FIXME)
 291 #ifdef __WIN16__
 292     int width = icon.GetWidth(),
 293         height = icon.GetHeight();
 294
 295     // copy the icon to the bitmap
 296     ScreenHDC hdcScreen;
 297     HDC hdc = ::CreateCompatibleDC(hdcScreen);
 298     HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
 299     HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
 300
 301     ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
 302
 303     ::SelectObject(hdc, hbmpOld);
 304     ::DeleteDC(hdc);
 305
 306     wxBitmapRefData *refData = new wxBitmapRefData;
 307     m_refData = refData;
 308
 309     refData->m_width = width;
 310     refData->m_height = height;
 311     refData->m_depth = wxDisplayDepth();
 312
 313     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 314
 315 #if WXWIN_COMPATIBILITY_2
 316     refData->m_ok = TRUE;
 317 #endif // WXWIN_COMPATIBILITY_2
 318
 319     return TRUE;
 320 #else // Win32
 321     return CopyFromIconOrCursor(icon);
 322 #endif // Win16/Win32
 323 }
 324
 325 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
 326 {
 327     wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
 328
 329     HBITMAP hbitmap = dib.CreateDDB();
 330     if ( !hbitmap )
 331         return FALSE;
 332
 333     UnRef();
 334
 335     wxBitmapRefData *refData = new wxBitmapRefData;
 336     m_refData = refData;
 337
 338     refData->m_width = dib.GetWidth();
 339     refData->m_height = dib.GetHeight();
 340     refData->m_depth = dib.GetDepth();
 341
 342     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 343
 344 #if wxUSE_PALETTE
 345     wxPalette *palette = dib.CreatePalette();
 346     if ( palette )
 347     {
 348         refData->m_bitmapPalette = *palette;
 349     }
 350
 351     delete palette;
 352 #endif // wxUSE_PALETTE
 353
 354     return TRUE;
 355 }
 356
 357 wxBitmap::~wxBitmap()
 358 {
 359 }
 360
 361 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 362 {
 363     Init();
 364
 365 #ifndef __WXMICROWIN__
 366     wxBitmapRefData *refData = new wxBitmapRefData;
 367     m_refData = refData;
 368
 369     refData->m_width = width;
 370     refData->m_height = height;
 371     refData->m_depth = depth;
 372
 373     char *data;
 374     if ( depth == 1 )
 375     {
 376         // we assume that it is in XBM format which is not quite the same as
 377         // the format CreateBitmap() wants because the order of bytes in the
 378         // line is inversed!
 379         const size_t bytesPerLine = (width + 7) / 8;
 380         const size_t padding = bytesPerLine % 2;
 381         const size_t len = height * ( padding + bytesPerLine );
 382         data = (char *)malloc(len);
 383         const char *src = bits;
 384         char *dst = data;
 385
 386         for ( int rows = 0; rows < height; rows++ )
 387         {
 388             for ( size_t cols = 0; cols < bytesPerLine; cols++ )
 389             {
 390                 unsigned char val = *src++;
 391                 unsigned char reversed = 0;
 392
 393                 for ( int bits = 0; bits < 8; bits++)
 394                 {
 395                     reversed <<= 1;
 396                     reversed |= (val & 0x01);
 397                     val >>= 1;
 398                 }
 399                 *dst++ = reversed;
 400             }
 401
 402             if ( padding )
 403                 *dst++ = 0;
 404         }
 405     }
 406     else
 407     {
 408         // bits should already be in Windows standard format
 409         data = (char *)bits;    // const_cast is harmless
 410     }
 411
 412     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
 413     if ( !hbmp )
 414     {
 415         wxLogLastError(wxT("CreateBitmap"));
 416     }
 417
 418     if ( data != bits )
 419     {
 420         free(data);
 421     }
 422
 423     SetHBITMAP((WXHBITMAP)hbmp);
 424 #endif
 425 }
 426
 427 // Create from XPM data
 428 bool wxBitmap::CreateFromXpm(const char **data)
 429 {
 430 #if wxUSE_IMAGE && wxUSE_XPM
 431     Init();
 432
 433     wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
 434
 435     wxXPMDecoder decoder;
 436     wxImage img = decoder.ReadData(data);
 437     wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
 438
 439     *this = wxBitmap(img);
 440     return TRUE;
 441 #else
 442     return FALSE;
 443 #endif
 444 }
 445
 446 wxBitmap::wxBitmap(int w, int h, int d)
 447 {
 448     Init();
 449
 450     (void)Create(w, h, d);
 451 }
 452
 453 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
 454 {
 455     Init();
 456
 457     (void)Create(w, h, dc);
 458 }
 459
 460 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
 461 {
 462     Init();
 463
 464     (void)Create(data, type, width, height, depth);
 465 }
 466
 467 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 468 {
 469     Init();
 470
 471     LoadFile(filename, (int)type);
 472 }
 473
 474 bool wxBitmap::Create(int width, int height, int depth)
 475 {
 476     return DoCreate(width, height, depth, 0);
 477 }
 478
 479 bool wxBitmap::Create(int width, int height, const wxDC& dc)
 480 {
 481     wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
 482
 483     return DoCreate(width, height, -1, dc.GetHDC());
 484 }
 485
 486 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
 487 {
 488     UnRef();
 489
 490     m_refData = new wxBitmapRefData;
 491
 492     GetBitmapData()->m_width = w;
 493     GetBitmapData()->m_height = h;
 494
 495     HBITMAP hbmp;
 496
 497     if ( wxShouldCreateDIB(w, h, d, hdc) )
 498     {
 499         if ( d == -1 )
 500         {
 501             // create DIBs without alpha channel by default
 502             d = 24;
 503         }
 504
 505         wxDIB dib(w, h, d);
 506         if ( !dib.IsOk() )
 507            return FALSE;
 508
 509         // don't delete the DIB section in dib object dtor
 510         hbmp = dib.Detach();
 511
 512         GetBitmapData()->m_isDIB = TRUE;
 513         GetBitmapData()->m_depth = d;
 514     }
 515     else // create a DDB
 516     {
 517         if ( d == -1 )
 518             d = wxDisplayDepth();
 519
 520         GetBitmapData()->m_depth = d;
 521
 522 #ifndef __WXMICROWIN__
 523         if ( d > 0 )
 524         {
 525             hbmp = ::CreateBitmap(w, h, 1, d, NULL);
 526             if ( !hbmp )
 527             {
 528                 wxLogLastError(wxT("CreateBitmap"));
 529             }
 530         }
 531         else
 532 #endif // !__WXMICROWIN__
 533         {
 534             ScreenHDC dc;
 535             hbmp = ::CreateCompatibleBitmap(dc, w, h);
 536             if ( !hbmp )
 537             {
 538                 wxLogLastError(wxT("CreateCompatibleBitmap"));
 539             }
 540
 541             GetBitmapData()->m_depth = wxDisplayDepth();
 542         }
 543     }
 544
 545     SetHBITMAP((WXHBITMAP)hbmp);
 546
 547 #if WXWIN_COMPATIBILITY_2
 548     GetBitmapData()->m_ok = hbmp != 0;
 549 #endif // WXWIN_COMPATIBILITY_2
 550
 551     return Ok();
 552 }
 553
 554 #if wxUSE_IMAGE
 555
 556 // ----------------------------------------------------------------------------
 557 // wxImage to/from conversions for Microwin
 558 // ----------------------------------------------------------------------------
 559
 560 // Microwin versions are so different from normal ones that it really doesn't
 561 // make sense to use #ifdefs inside the function bodies
 562 #ifdef __WXMICROWIN__
 563
 564 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
 565 {
 566     // Set this to 1 to experiment with mask code,
 567     // which currently doesn't work
 568     #define USE_MASKS 0
 569
 570     m_refData = new wxBitmapRefData();
 571
 572     // Initial attempt at a simple-minded implementation.
 573     // The bitmap will always be created at the screen depth,
 574     // so the 'depth' argument is ignored.
 575
 576     HDC hScreenDC = ::GetDC(NULL);
 577     int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
 578
 579     HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
 580     HBITMAP hMaskBitmap = NULL;
 581     HBITMAP hOldMaskBitmap = NULL;
 582     HDC hMaskDC = NULL;
 583     unsigned char maskR = 0;
 584     unsigned char maskG = 0;
 585     unsigned char maskB = 0;
 586
 587     //    printf("Created bitmap %d\n", (int) hBitmap);
 588     if (hBitmap == NULL)
 589     {
 590         ::ReleaseDC(NULL, hScreenDC);
 591         return FALSE;
 592     }
 593     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 594
 595     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 596     ::ReleaseDC(NULL, hScreenDC);
 597
 598     // created an mono-bitmap for the possible mask
 599     bool hasMask = image.HasMask();
 600
 601     if ( hasMask )
 602     {
 603 #if USE_MASKS
 604         // FIXME: we should be able to pass bpp = 1, but
 605         // GdBlit can't handle a different depth
 606 #if 0
 607         hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
 608 #else
 609         hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
 610 #endif
 611         maskR = image.GetMaskRed();
 612         maskG = image.GetMaskGreen();
 613         maskB = image.GetMaskBlue();
 614
 615         if (!hMaskBitmap)
 616         {
 617             hasMask = FALSE;
 618         }
 619         else
 620         {
 621             hScreenDC = ::GetDC(NULL);
 622             hMaskDC = ::CreateCompatibleDC(hScreenDC);
 623            ::ReleaseDC(NULL, hScreenDC);
 624
 625             hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
 626         }
 627 #else
 628         hasMask = FALSE;
 629 #endif
 630     }
 631
 632     int i, j;
 633     for (i = 0; i < image.GetWidth(); i++)
 634     {
 635         for (j = 0; j < image.GetHeight(); j++)
 636         {
 637             unsigned char red = image.GetRed(i, j);
 638             unsigned char green = image.GetGreen(i, j);
 639             unsigned char blue = image.GetBlue(i, j);
 640
 641             ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
 642
 643             if (hasMask)
 644             {
 645                 // scan the bitmap for the transparent colour and set the corresponding
 646                 // pixels in the mask to BLACK and the rest to WHITE
 647                 if (maskR == red && maskG == green && maskB == blue)
 648                     ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
 649                 else
 650                     ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
 651             }
 652         }
 653     }
 654
 655     ::SelectObject(hMemDC, hOldBitmap);
 656     ::DeleteDC(hMemDC);
 657     if (hasMask)
 658     {
 659         ::SelectObject(hMaskDC, hOldMaskBitmap);
 660         ::DeleteDC(hMaskDC);
 661
 662         ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
 663     }
 664
 665     SetWidth(image.GetWidth());
 666     SetHeight(image.GetHeight());
 667     SetDepth(screenDepth);
 668     SetHBITMAP( (WXHBITMAP) hBitmap );
 669
 670 #if wxUSE_PALETTE
 671     // Copy the palette from the source image
 672     SetPalette(image.GetPalette());
 673 #endif // wxUSE_PALETTE
 674
 675 #if WXWIN_COMPATIBILITY_2
 676     // check the wxBitmap object
 677     GetBitmapData()->SetOk();
 678 #endif // WXWIN_COMPATIBILITY_2
 679
 680     return TRUE;
 681 }
 682
 683 wxImage wxBitmap::ConvertToImage() const
 684 {
 685     // Initial attempt at a simple-minded implementation.
 686     // The bitmap will always be created at the screen depth,
 687     // so the 'depth' argument is ignored.
 688     // TODO: transparency (create a mask image)
 689
 690     if (!Ok())
 691     {
 692         wxFAIL_MSG( wxT("bitmap is invalid") );
 693         return wxNullImage;
 694     }
 695
 696     wxImage image;
 697
 698     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 699
 700     // create an wxImage object
 701     int width = GetWidth();
 702     int height = GetHeight();
 703     image.Create( width, height );
 704     unsigned char *data = image.GetData();
 705     if( !data )
 706     {
 707         wxFAIL_MSG( wxT("could not allocate data for image") );
 708         return wxNullImage;
 709     }
 710
 711     HDC hScreenDC = ::GetDC(NULL);
 712
 713     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 714     ::ReleaseDC(NULL, hScreenDC);
 715
 716     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 717
 718     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 719
 720     int i, j;
 721     for (i = 0; i < GetWidth(); i++)
 722     {
 723         for (j = 0; j < GetHeight(); j++)
 724         {
 725             COLORREF color = ::GetPixel(hMemDC, i, j);
 726             unsigned char red = GetRValue(color);
 727             unsigned char green = GetGValue(color);
 728             unsigned char blue = GetBValue(color);
 729
 730             image.SetRGB(i, j, red, green, blue);
 731         }
 732     }
 733
 734     ::SelectObject(hMemDC, hOldBitmap);
 735     ::DeleteDC(hMemDC);
 736
 737 #if wxUSE_PALETTE
 738     // Copy the palette from the source image
 739     if (GetPalette())
 740         image.SetPalette(* GetPalette());
 741 #endif // wxUSE_PALETTE
 742
 743     return image;
 744 }
 745
 746 #endif // __WXMICROWIN__
 747
 748 // ----------------------------------------------------------------------------
 749 // wxImage to/from conversions
 750 // ----------------------------------------------------------------------------
 751
 752 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 753 {
 754     return CreateFromImage(image, depth, 0);
 755 }
 756
 757 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
 758 {
 759     wxCHECK_MSG( dc.Ok(), FALSE,
 760                     _T("invalid HDC in wxBitmap::CreateFromImage()") );
 761
 762     return CreateFromImage(image, -1, dc.GetHDC());
 763 }
 764
 765 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
 766 {
 767     wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
 768
 769     UnRef();
 770
 771     // first convert the image to DIB
 772     const int h = image.GetHeight();
 773     const int w = image.GetWidth();
 774
 775     wxDIB dib(image);
 776     if ( !dib.IsOk() )
 777         return FALSE;
 778
 779
 780     // store the bitmap parameters
 781     wxBitmapRefData *refData = new wxBitmapRefData;
 782     refData->m_width = w;
 783     refData->m_height = h;
 784     refData->m_hasAlpha = image.HasAlpha();
 785
 786     m_refData = refData;
 787
 788
 789     // next either store DIB as is or create a DDB from it
 790     HBITMAP hbitmap;
 791
 792     // are we going to use DIB?
 793     //
 794     // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
 795     if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
 796     {
 797         // don't delete the DIB section in dib object dtor
 798         hbitmap = dib.Detach();
 799
 800         refData->m_isDIB = TRUE;
 801         refData->m_depth = dib.GetDepth();
 802     }
 803     else // we need to convert DIB to DDB
 804     {
 805         hbitmap = dib.CreateDDB((HDC)hdc);
 806
 807         refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
 808     }
 809
 810     // validate this object
 811     SetHBITMAP((WXHBITMAP)hbitmap);
 812
 813 #if WXWIN_COMPATIBILITY_2
 814     m_refData->m_ok = TRUE;
 815 #endif // WXWIN_COMPATIBILITY_2
 816
 817     // finally also set the mask if we have one
 818     if ( image.HasMask() )
 819     {
 820         SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
 821                                            image.GetMaskGreen(),
 822                                            image.GetMaskBlue())));
 823     }
 824
 825     return TRUE;
 826 }
 827
 828 wxImage wxBitmap::ConvertToImage() const
 829 {
 830     // the colour used as transparent one in wxImage and the one it is replaced
 831     // with when it really occurs in the bitmap
 832     static const int MASK_RED = 1;
 833     static const int MASK_GREEN = 2;
 834     static const int MASK_BLUE = 3;
 835     static const int MASK_BLUE_REPLACEMENT = 2;
 836
 837     wxImage image;
 838
 839     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 840
 841     // create an wxImage object
 842     int width = GetWidth();
 843     int height = GetHeight();
 844     image.Create( width, height );
 845     unsigned char *data = image.GetData();
 846     if( !data )
 847     {
 848         wxFAIL_MSG( wxT("could not allocate data for image") );
 849         return wxNullImage;
 850     }
 851
 852     // calc the number of bytes per scanline and padding in the DIB
 853     int bytePerLine = width*3;
 854     int sizeDWORD = sizeof( DWORD );
 855     int lineBoundary =  bytePerLine % sizeDWORD;
 856     int padding = 0;
 857     if( lineBoundary > 0 )
 858     {
 859         padding = sizeDWORD - lineBoundary;
 860         bytePerLine += padding;
 861     }
 862
 863     // create a DIB header
 864     int headersize = sizeof(BITMAPINFOHEADER);
 865     BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
 866     if( !lpDIBh )
 867     {
 868         wxFAIL_MSG( wxT("could not allocate data for DIB header") );
 869         free( data );
 870         return wxNullImage;
 871     }
 872     // Fill in the DIB header
 873     lpDIBh->bmiHeader.biSize = headersize;
 874     lpDIBh->bmiHeader.biWidth = width;
 875     lpDIBh->bmiHeader.biHeight = -height;
 876     lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
 877     lpDIBh->bmiHeader.biPlanes = 1;
 878     lpDIBh->bmiHeader.biBitCount = 24;
 879     lpDIBh->bmiHeader.biCompression = BI_RGB;
 880     lpDIBh->bmiHeader.biClrUsed = 0;
 881     // These seem not really needed for our purpose here.
 882     lpDIBh->bmiHeader.biClrImportant = 0;
 883     lpDIBh->bmiHeader.biXPelsPerMeter = 0;
 884     lpDIBh->bmiHeader.biYPelsPerMeter = 0;
 885     // memory for DIB data
 886     unsigned char *lpBits;
 887     lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
 888     if( !lpBits )
 889     {
 890         wxFAIL_MSG( wxT("could not allocate data for DIB") );
 891         free( data );
 892         free( lpDIBh );
 893         return wxNullImage;
 894     }
 895
 896     // copy data from the device-dependent bitmap to the DIB
 897     HDC hdc = ::GetDC(NULL);
 898     HBITMAP hbitmap;
 899     hbitmap = (HBITMAP) GetHBITMAP();
 900     ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
 901
 902     // copy DIB data into the wxImage object
 903     int i, j;
 904     unsigned char *ptdata = data;
 905     unsigned char *ptbits = lpBits;
 906     for( i=0; i<height; i++ )
 907     {
 908         for( j=0; j<width; j++ )
 909         {
 910             *(ptdata++) = *(ptbits+2);
 911             *(ptdata++) = *(ptbits+1);
 912             *(ptdata++) = *(ptbits  );
 913             ptbits += 3;
 914         }
 915         ptbits += padding;
 916     }
 917
 918     // similarly, set data according to the possible mask bitmap
 919     if( GetMask() && GetMask()->GetMaskBitmap() )
 920     {
 921         hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
 922         // memory DC created, color set, data copied, and memory DC deleted
 923         HDC memdc = ::CreateCompatibleDC( hdc );
 924         ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
 925         ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
 926         ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
 927         ::DeleteDC( memdc );
 928         ptdata = data;
 929         ptbits = lpBits;
 930         for( i=0; i<height; i++ )
 931         {
 932             for( j=0; j<width; j++ )
 933             {
 934                 // is this pixel transparent?
 935                 if ( *ptbits != 0 )
 936                 {
 937                     if ( (ptdata[0] == MASK_RED) &&
 938                             (ptdata[1] == MASK_GREEN) &&
 939                                 (ptdata[2] == MASK_BLUE) )
 940                     {
 941                         // we have to fudge the colour a bit to prevent this
 942                         // pixel from appearing transparent
 943                         ptdata[2] = MASK_BLUE_REPLACEMENT;
 944                     }
 945                     ptdata += 3;
 946                 }
 947                 else // masked pixel
 948                 {
 949                     *(ptdata++)  = MASK_RED;
 950                     *(ptdata++)  = MASK_GREEN;
 951                     *(ptdata++)  = MASK_BLUE;
 952                 }
 953                 ptbits += 3;
 954             }
 955             ptbits += padding;
 956         }
 957
 958         image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
 959         image.SetMask( TRUE );
 960     }
 961     else
 962     {
 963         image.SetMask( FALSE );
 964     }
 965     // free allocated resources
 966     ::ReleaseDC(NULL, hdc);
 967     free(lpDIBh);
 968     free(lpBits);
 969
 970     return image;
 971 }
 972
 973 #endif // wxUSE_IMAGE
 974
 975 // ----------------------------------------------------------------------------
 976 // loading and saving bitmaps
 977 // ----------------------------------------------------------------------------
 978
 979 bool wxBitmap::LoadFile(const wxString& filename, long type)
 980 {
 981     UnRef();
 982
 983     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 984
 985     if ( handler )
 986     {
 987         m_refData = new wxBitmapRefData;
 988
 989         return handler->LoadFile(this, filename, type, -1, -1);
 990     }
 991 #if wxUSE_IMAGE
 992     else
 993     {
 994         wxImage image;
 995         if ( image.LoadFile( filename, type ) && image.Ok() )
 996         {
 997             *this = wxBitmap(image);
 998
 999             return TRUE;
1000         }
1001     }
1002 #endif // wxUSE_IMAGE
1003
1004     return FALSE;
1005 }
1006
1007 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
1008 {
1009     UnRef();
1010
1011     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1012
1013     if ( !handler )
1014     {
1015         wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1016
1017         return FALSE;
1018     }
1019
1020     m_refData = new wxBitmapRefData;
1021
1022     return handler->Create(this, data, type, width, height, depth);
1023 }
1024
1025 bool wxBitmap::SaveFile(const wxString& filename,
1026                         int type,
1027                         const wxPalette *palette)
1028 {
1029     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1030
1031     if ( handler )
1032     {
1033         return handler->SaveFile(this, filename, type, palette);
1034     }
1035 #if wxUSE_IMAGE
1036     else
1037     {
1038         // FIXME what about palette? shouldn't we use it?
1039         wxImage image = ConvertToImage();
1040         if ( image.Ok() )
1041         {
1042             return image.SaveFile(filename, type);
1043         }
1044     }
1045 #endif // wxUSE_IMAGE
1046
1047     return FALSE;
1048 }
1049
1050 // ----------------------------------------------------------------------------
1051 // sub bitmap extraction
1052 // ----------------------------------------------------------------------------
1053
1054 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1055 {
1056     wxCHECK_MSG( Ok() &&
1057                  (rect.x >= 0) && (rect.y >= 0) &&
1058                  (rect.x+rect.width <= GetWidth()) &&
1059                  (rect.y+rect.height <= GetHeight()),
1060                  wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1061
1062     wxBitmap ret( rect.width, rect.height );
1063     wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1064
1065 #ifndef __WXMICROWIN__
1066     // TODO: copy alpha channel data if any
1067
1068     // copy bitmap data
1069     MemoryHDC dcSrc,
1070               dcDst;
1071
1072     {
1073         SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1074                     selectDst(dcDst, GetHbitmapOf(ret));
1075
1076         if ( !selectSrc || !selectDst )
1077         {
1078             wxLogLastError(_T("SelectObjct(hBitmap)"));
1079         }
1080
1081         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1082                        dcSrc, rect.x, rect.y, SRCCOPY) )
1083         {
1084             wxLogLastError(_T("BitBlt"));
1085         }
1086     }
1087
1088     // copy mask if there is one
1089     if ( GetMask() )
1090     {
1091         HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1092
1093         SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1094                     selectDst(dcDst, hbmpMask);
1095
1096         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1097                        dcSrc, rect.x, rect.y, SRCCOPY) )
1098         {
1099             wxLogLastError(_T("BitBlt"));
1100         }
1101
1102         wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1103         ret.SetMask(mask);
1104     }
1105 #endif // !__WXMICROWIN__
1106
1107     return ret;
1108 }
1109
1110 // ----------------------------------------------------------------------------
1111 // wxBitmap accessors
1112 // ----------------------------------------------------------------------------
1113
1114 #if wxUSE_PALETTE
1115 wxPalette* wxBitmap::GetPalette() const
1116 {
1117     return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1118                            : (wxPalette *) NULL;
1119 }
1120 #endif
1121
1122 wxMask *wxBitmap::GetMask() const
1123 {
1124     return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1125 }
1126
1127 #ifdef __WXDEBUG__
1128
1129 wxDC *wxBitmap::GetSelectedInto() const
1130 {
1131     return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1132 }
1133
1134 #endif
1135
1136 #if WXWIN_COMPATIBILITY_2_4
1137
1138 int wxBitmap::GetQuality() const
1139 {
1140     return 0;
1141 }
1142
1143 #endif // WXWIN_COMPATIBILITY_2_4
1144
1145 void wxBitmap::UseAlpha()
1146 {
1147     if ( GetBitmapData() )
1148         GetBitmapData()->m_hasAlpha = true;
1149 }
1150
1151 bool wxBitmap::HasAlpha() const
1152 {
1153     return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1154 }
1155
1156 // ----------------------------------------------------------------------------
1157 // wxBitmap setters
1158 // ----------------------------------------------------------------------------
1159
1160 #ifdef __WXDEBUG__
1161
1162 void wxBitmap::SetSelectedInto(wxDC *dc)
1163 {
1164     if ( GetBitmapData() )
1165         GetBitmapData()->m_selectedInto = dc;
1166 }
1167
1168 #endif
1169
1170 #if wxUSE_PALETTE
1171
1172 void wxBitmap::SetPalette(const wxPalette& palette)
1173 {
1174     EnsureHasData();
1175
1176     GetBitmapData()->m_bitmapPalette = palette;
1177 }
1178
1179 #endif // wxUSE_PALETTE
1180
1181 void wxBitmap::SetMask(wxMask *mask)
1182 {
1183     EnsureHasData();
1184
1185     GetBitmapData()->SetMask(mask);
1186 }
1187
1188 #if WXWIN_COMPATIBILITY_2
1189
1190 void wxBitmap::SetOk(bool isOk)
1191 {
1192     EnsureHasData();
1193
1194     GetBitmapData()->m_ok = isOk;
1195 }
1196
1197 #endif // WXWIN_COMPATIBILITY_2
1198
1199 #if WXWIN_COMPATIBILITY_2_4
1200
1201 void wxBitmap::SetQuality(int WXUNUSED(quality))
1202 {
1203 }
1204
1205 #endif // WXWIN_COMPATIBILITY_2_4
1206
1207 // ----------------------------------------------------------------------------
1208 // raw bitmap access support
1209 // ----------------------------------------------------------------------------
1210
1211 #ifdef wxHAVE_RAW_BITMAP
1212 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1213 {
1214     if ( !Ok() )
1215     {
1216         // no bitmap, no data (raw or otherwise)
1217         return NULL;
1218     }
1219
1220     // if we're already a DIB we can access our data directly, but if not we
1221     // need to convert this DDB to a DIB section and use it for raw access and
1222     // then convert it back
1223     HBITMAP hDIB;
1224     if ( !GetBitmapData()->m_isDIB )
1225     {
1226         wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
1227                         _T("GetRawData() may be called only once") );
1228
1229         wxDIB *dib = new wxDIB(*this);
1230         if ( !dib->IsOk() )
1231         {
1232             delete dib;
1233
1234             return NULL;
1235         }
1236
1237         // we'll free it in UngetRawData()
1238         GetBitmapData()->m_dib = dib;
1239
1240         hDIB = dib->GetHandle();
1241     }
1242     else // we're a DIB
1243     {
1244         hDIB = GetHbitmap();
1245     }
1246
1247     DIBSECTION ds;
1248     if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1249     {
1250         wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1251
1252         return NULL;
1253     }
1254
1255     // check that the bitmap is in correct format
1256     if ( ds.dsBm.bmBitsPixel != bpp )
1257     {
1258         wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1259
1260         return NULL;
1261     }
1262
1263     // ok, store the relevant info in wxPixelDataBase
1264     const LONG h = ds.dsBm.bmHeight;
1265
1266     data.m_width = ds.dsBm.bmWidth;
1267     data.m_height = h;
1268
1269     // remember that DIBs are stored in top to bottom order!
1270     const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1271     data.m_stride = -bytesPerRow;
1272
1273     char *bits = (char *)ds.dsBm.bmBits;
1274     if ( h > 1 )
1275     {
1276         bits += (h - 1)*bytesPerRow;
1277     }
1278
1279     return bits;
1280 }
1281
1282 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1283 {
1284     if ( !Ok() )
1285         return;
1286
1287     // the cast is ugly but we can't do without it and without making this
1288     // function template (and hence inline) unfortunately
1289     typedef wxPixelData<wxBitmap, wxAlphaPixelFormat> PixelData;
1290     PixelData& data = (PixelData &)dataBase;
1291
1292     if ( !data )
1293     {
1294         // invalid data, don't crash -- but don't assert neither as we're
1295         // called automatically from wxPixelDataBase dtor and so there is no
1296         // way to prevent this from happening
1297         return;
1298     }
1299
1300     if ( GetBitmapData()->m_hasAlpha )
1301     {
1302         // AlphaBlend() wants to have premultiplied source alpha but
1303         // wxRawBitmap API uses normal, not premultiplied, colours, so adjust
1304         // them here now
1305         PixelData::Iterator p(data);
1306
1307         const int w = data.GetWidth();
1308         const int h = data.GetHeight();
1309
1310         for ( int y = 0; y < h; y++ )
1311         {
1312             PixelData::Iterator rowStart = p;
1313
1314             for ( int x = 0; x < w; x++ )
1315             {
1316                 const unsigned alpha = p.Alpha();
1317
1318                 p.Red() = (p.Red() * alpha + 127) / 255;
1319                 p.Blue() = (p.Blue() * alpha + 127) / 255;
1320                 p.Green() = (p.Green() * alpha + 127) / 255;
1321
1322                 ++p;
1323             }
1324
1325             p = rowStart;
1326             p.OffsetY(data, 1);
1327         }
1328
1329         // if we're a DDB we need to convert DIB back to DDB now to make the
1330         // changes made via raw bitmap access effective
1331         if ( !GetBitmapData()->m_isDIB )
1332         {
1333             wxDIB *dib = GetBitmapData()->m_dib;
1334             GetBitmapData()->m_dib = NULL;
1335
1336             // TODO: convert
1337
1338             delete dib;
1339         }
1340     }
1341 }
1342 #endif // #ifdef wxHAVE_RAW_BITMAP
1343
1344 // ----------------------------------------------------------------------------
1345 // wxMask
1346 // ----------------------------------------------------------------------------
1347
1348 wxMask::wxMask()
1349 {
1350     m_maskBitmap = 0;
1351 }
1352
1353 // Construct a mask from a bitmap and a colour indicating
1354 // the transparent area
1355 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1356 {
1357     m_maskBitmap = 0;
1358     Create(bitmap, colour);
1359 }
1360
1361 // Construct a mask from a bitmap and a palette index indicating
1362 // the transparent area
1363 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1364 {
1365     m_maskBitmap = 0;
1366     Create(bitmap, paletteIndex);
1367 }
1368
1369 // Construct a mask from a mono bitmap (copies the bitmap).
1370 wxMask::wxMask(const wxBitmap& bitmap)
1371 {
1372     m_maskBitmap = 0;
1373     Create(bitmap);
1374 }
1375
1376 wxMask::~wxMask()
1377 {
1378     if ( m_maskBitmap )
1379         ::DeleteObject((HBITMAP) m_maskBitmap);
1380 }
1381
1382 // Create a mask from a mono bitmap (copies the bitmap).
1383 bool wxMask::Create(const wxBitmap& bitmap)
1384 {
1385 #ifndef __WXMICROWIN__
1386     wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1387                  _T("can't create mask from invalid or not monochrome bitmap") );
1388
1389     if ( m_maskBitmap )
1390     {
1391         ::DeleteObject((HBITMAP) m_maskBitmap);
1392         m_maskBitmap = 0;
1393     }
1394
1395     m_maskBitmap = (WXHBITMAP) CreateBitmap(
1396                                             bitmap.GetWidth(),
1397                                             bitmap.GetHeight(),
1398                                             1, 1, 0
1399                                            );
1400     HDC srcDC = CreateCompatibleDC(0);
1401     SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1402     HDC destDC = CreateCompatibleDC(0);
1403     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1404     BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1405     SelectObject(srcDC, 0);
1406     DeleteDC(srcDC);
1407     SelectObject(destDC, 0);
1408     DeleteDC(destDC);
1409     return TRUE;
1410 #else
1411     return FALSE;
1412 #endif
1413 }
1414
1415 // Create a mask from a bitmap and a palette index indicating
1416 // the transparent area
1417 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1418 {
1419     if ( m_maskBitmap )
1420     {
1421         ::DeleteObject((HBITMAP) m_maskBitmap);
1422         m_maskBitmap = 0;
1423     }
1424
1425 #if wxUSE_PALETTE
1426     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1427     {
1428         unsigned char red, green, blue;
1429         if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1430         {
1431             wxColour transparentColour(red, green, blue);
1432             return Create(bitmap, transparentColour);
1433         }
1434     }
1435 #endif // wxUSE_PALETTE
1436
1437     return FALSE;
1438 }
1439
1440 // Create a mask from a bitmap and a colour indicating
1441 // the transparent area
1442 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1443 {
1444 #ifndef __WXMICROWIN__
1445     wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1446
1447     if ( m_maskBitmap )
1448     {
1449         ::DeleteObject((HBITMAP) m_maskBitmap);
1450         m_maskBitmap = 0;
1451     }
1452
1453     int width = bitmap.GetWidth(),
1454         height = bitmap.GetHeight();
1455
1456     // scan the bitmap for the transparent colour and set the corresponding
1457     // pixels in the mask to BLACK and the rest to WHITE
1458     COLORREF maskColour = wxColourToPalRGB(colour);
1459     m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1460
1461     HDC srcDC = ::CreateCompatibleDC(NULL);
1462     HDC destDC = ::CreateCompatibleDC(NULL);
1463     if ( !srcDC || !destDC )
1464     {
1465         wxLogLastError(wxT("CreateCompatibleDC"));
1466     }
1467
1468     bool ok = TRUE;
1469
1470     // SelectObject() will fail
1471     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1472                   _T("bitmap can't be selected in another DC") );
1473
1474     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1475     if ( !hbmpSrcOld )
1476     {
1477         wxLogLastError(wxT("SelectObject"));
1478
1479         ok = FALSE;
1480     }
1481
1482     HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1483     if ( !hbmpDstOld )
1484     {
1485         wxLogLastError(wxT("SelectObject"));
1486
1487         ok = FALSE;
1488     }
1489
1490     if ( ok )
1491     {
1492         // this will create a monochrome bitmap with 0 points for the pixels
1493         // which have the same value as the background colour and 1 for the
1494         // others
1495         ::SetBkColor(srcDC, maskColour);
1496         ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1497     }
1498
1499     ::SelectObject(srcDC, hbmpSrcOld);
1500     ::DeleteDC(srcDC);
1501     ::SelectObject(destDC, hbmpDstOld);
1502     ::DeleteDC(destDC);
1503
1504     return ok;
1505 #else // __WXMICROWIN__
1506     return FALSE;
1507 #endif // __WXMICROWIN__/!__WXMICROWIN__
1508 }
1509
1510 // ----------------------------------------------------------------------------
1511 // wxBitmapHandler
1512 // ----------------------------------------------------------------------------
1513
1514 bool wxBitmapHandler::Create(wxGDIImage *image,
1515                              void *data,
1516                              long flags,
1517                              int width, int height, int depth)
1518 {
1519     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1520
1521     return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1522 }
1523
1524 bool wxBitmapHandler::Load(wxGDIImage *image,
1525                            const wxString& name,
1526                            long flags,
1527                            int width, int height)
1528 {
1529     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1530
1531     return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1532 }
1533
1534 bool wxBitmapHandler::Save(wxGDIImage *image,
1535                            const wxString& name,
1536                            int type)
1537 {
1538     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1539
1540     return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1541 }
1542
1543 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1544                              void *WXUNUSED(data),
1545                              long WXUNUSED(type),
1546                              int WXUNUSED(width),
1547                              int WXUNUSED(height),
1548                              int WXUNUSED(depth))
1549 {
1550     return FALSE;
1551 }
1552
1553 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1554                                const wxString& WXUNUSED(name),
1555                                long WXUNUSED(type),
1556                                int WXUNUSED(desiredWidth),
1557                                int WXUNUSED(desiredHeight))
1558 {
1559     return FALSE;
1560 }
1561
1562 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1563                                const wxString& WXUNUSED(name),
1564                                int WXUNUSED(type),
1565                                const wxPalette *WXUNUSED(palette))
1566 {
1567     return FALSE;
1568 }
1569
1570 // ----------------------------------------------------------------------------
1571 // DIB functions
1572 // ----------------------------------------------------------------------------
1573
1574 #ifndef __WXMICROWIN__
1575 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1576                  HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1577 {
1578    unsigned long   i, headerSize;
1579    LPBITMAPINFO    lpDIBheader = NULL;
1580    LPPALETTEENTRY  lpPe = NULL;
1581
1582
1583    // Allocate space for a DIB header
1584    headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1585    lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1586    lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1587
1588    GetPaletteEntries(hPal, 0, 256, lpPe);
1589
1590    memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1591
1592    // Fill in the static parts of the DIB header
1593    lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1594    lpDIBheader->bmiHeader.biWidth = xSize;
1595    lpDIBheader->bmiHeader.biHeight = ySize;
1596    lpDIBheader->bmiHeader.biPlanes = 1;
1597
1598    // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1599    lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1600    lpDIBheader->bmiHeader.biCompression = BI_RGB;
1601    lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1602    lpDIBheader->bmiHeader.biClrUsed = 256;
1603
1604
1605    // Initialize the DIB palette
1606    for (i = 0; i < 256; i++) {
1607       lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1608       lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1609       lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1610       lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1611    }
1612
1613    *lpDIBHeader = lpDIBheader;
1614
1615    return TRUE;
1616 }
1617
1618 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1619 {
1620     free(lpDIBHeader);
1621 }
1622 #endif
1623
1624 // ----------------------------------------------------------------------------
1625 // global helper functions implemented here
1626 // ----------------------------------------------------------------------------
1627
1628 // helper of wxBitmapToHICON/HCURSOR
1629 static
1630 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1631                              bool iconWanted,
1632                              int hotSpotX,
1633                              int hotSpotY)
1634 {
1635     if ( !bmp.Ok() )
1636     {
1637         // we can't create an icon/cursor form nothing
1638         return 0;
1639     }
1640
1641     wxMask *mask = bmp.GetMask();
1642     if ( !mask )
1643     {
1644         // we must have a mask for an icon, so even if it's probably incorrect,
1645         // do create it (grey is the "standard" transparent colour)
1646         mask = new wxMask(bmp, *wxLIGHT_GREY);
1647     }
1648
1649     ICONINFO iconInfo;
1650     iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1651     if ( !iconWanted )
1652     {
1653         iconInfo.xHotspot = hotSpotX;
1654         iconInfo.yHotspot = hotSpotY;
1655     }
1656
1657     iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1658     iconInfo.hbmColor = GetHbitmapOf(bmp);
1659
1660     // black out the transparent area to preserve background colour, because
1661     // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1662     // the mask to the dest rect.
1663     {
1664         MemoryHDC dcSrc, dcDst;
1665         SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1666                     selectBitmap(dcDst, iconInfo.hbmColor);
1667
1668         if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1669                        dcSrc, 0, 0, SRCAND) )
1670         {
1671             wxLogLastError(_T("BitBlt"));
1672         }
1673     }
1674
1675     HICON hicon = ::CreateIconIndirect(&iconInfo);
1676
1677     if ( !bmp.GetMask() )
1678     {
1679         // we created the mask, now delete it
1680         delete mask;
1681     }
1682
1683     // delete the inverted mask bitmap we created as well
1684     ::DeleteObject(iconInfo.hbmMask);
1685
1686     return hicon;
1687 }
1688
1689 HICON wxBitmapToHICON(const wxBitmap& bmp)
1690 {
1691     return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1692 }
1693
1694 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1695 {
1696     return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1697 }
1698
1699 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1700 {
1701 #ifndef __WXMICROWIN__
1702     wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1703
1704     // get width/height from the bitmap if not given
1705     if ( !w || !h )
1706     {
1707         BITMAP bm;
1708         ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1709         w = bm.bmWidth;
1710         h = bm.bmHeight;
1711     }
1712
1713     HDC hdcSrc = ::CreateCompatibleDC(NULL);
1714     HDC hdcDst = ::CreateCompatibleDC(NULL);
1715     if ( !hdcSrc || !hdcDst )
1716     {
1717         wxLogLastError(wxT("CreateCompatibleDC"));
1718     }
1719
1720     HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1721     if ( !hbmpInvMask )
1722     {
1723         wxLogLastError(wxT("CreateBitmap"));
1724     }
1725
1726     ::SelectObject(hdcSrc, hbmpMask);
1727     ::SelectObject(hdcDst, hbmpInvMask);
1728     if ( !::BitBlt(hdcDst, 0, 0, w, h,
1729                    hdcSrc, 0, 0,
1730                    NOTSRCCOPY) )
1731     {
1732         wxLogLastError(wxT("BitBlt"));
1733     }
1734
1735     ::DeleteDC(hdcSrc);
1736     ::DeleteDC(hdcDst);
1737
1738     return hbmpInvMask;
1739 #else
1740     return 0;
1741 #endif
1742 }