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 wxUSE_WXDIB
  47 #include "wx/msw/dib.h"
  48 #endif
  49
  50 #include "wx/image.h"
  51 #include "wx/xpmdecod.h"
  52
  53 #ifdef wxHAVE_RAW_BITMAP
  54 #include "wx/rawbmp.h"
  55 #endif
  56
  57 // missing from mingw32 header
  58 #ifndef CLR_INVALID
  59     #define CLR_INVALID ((COLORREF)-1)
  60 #endif // no CLR_INVALID
  61
  62 // ----------------------------------------------------------------------------
  63 // Bitmap data
  64 // ----------------------------------------------------------------------------
  65
  66 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
  67 {
  68 public:
  69     wxBitmapRefData();
  70     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 #if wxUSE_WXDIB
 106     // when GetRawData() is called for a DDB we need to convert it to a DIB
 107     // first to be able to provide direct access to it and we cache that DIB
 108     // here and convert it back to DDB when UngetRawData() is called
 109     wxDIB *m_dib;
 110 #endif
 111
 112     // true if we have alpha transparency info and can be drawn using
 113     // AlphaBlend()
 114     bool m_hasAlpha;
 115
 116     // true if our HBITMAP is a DIB section, false if it is a DDB
 117     bool m_isDIB;
 118
 119 private:
 120     // optional mask for transparent drawing
 121     wxMask       *m_bitmapMask;
 122
 123     DECLARE_NO_COPY_CLASS(wxBitmapRefData)
 124 };
 125
 126 // ----------------------------------------------------------------------------
 127 // macros
 128 // ----------------------------------------------------------------------------
 129
 130 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
 131 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
 132
 133 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
 134
 135 // ============================================================================
 136 // implementation
 137 // ============================================================================
 138
 139 // ----------------------------------------------------------------------------
 140 // helper functions
 141 // ----------------------------------------------------------------------------
 142
 143 // decide whether we should create a DIB or a DDB for the given parameters
 144 static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
 145 {
 146 #if wxUSE_WXDIB
 147     // here is the logic:
 148     //
 149     //  (a) if hdc is specified, the caller explicitly wants DDB
 150     //  (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
 151     //      less DIBs anyhow)
 152     //  (c) finally, create DIBs under Win9x even if the depth hasn't been
 153     //      explicitly specified but the current display depth is 24 or more
 154     //      and the image is "big", i.e. > 16Mb which is the theoretical limit
 155     //      for DDBs under Win9x
 156     //
 157     // consequences (all of which seem to make sense):
 158     //
 159     //  (i)     by default, DDBs are created (depth == -1 usually)
 160     //  (ii)    DIBs can be created by explicitly specifying the depth
 161     //  (iii)   using a DC always forces creating a DDB
 162     return !hdc &&
 163             (d >= 24 ||
 164                 (d == -1 &&
 165                     wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
 166 #else
 167     return FALSE;
 168 #endif
 169 }
 170
 171 // ----------------------------------------------------------------------------
 172 // wxBitmapRefData
 173 // ----------------------------------------------------------------------------
 174
 175 wxBitmapRefData::wxBitmapRefData()
 176 {
 177 #ifdef __WXDEBUG__
 178     m_selectedInto = NULL;
 179 #endif
 180     m_bitmapMask = NULL;
 181
 182     m_hBitmap = (WXHBITMAP) NULL;
 183 #if wxUSE_WXDIB
 184     m_dib = NULL;
 185 #endif
 186
 187     m_isDIB =
 188     m_hasAlpha = FALSE;
 189 }
 190
 191 void wxBitmapRefData::Free()
 192 {
 193     wxASSERT_MSG( !m_selectedInto,
 194                   wxT("deleting bitmap still selected into wxMemoryDC") );
 195
 196 #if wxUSE_WXDIB
 197     wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
 198 #endif
 199
 200     if ( m_hBitmap)
 201     {
 202         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
 203         {
 204             wxLogLastError(wxT("DeleteObject(hbitmap)"));
 205         }
 206     }
 207
 208     delete m_bitmapMask;
 209     m_bitmapMask = NULL;
 210 }
 211
 212 // ----------------------------------------------------------------------------
 213 // wxBitmap creation
 214 // ----------------------------------------------------------------------------
 215
 216 // this function should be called from all wxBitmap ctors
 217 void wxBitmap::Init()
 218 {
 219     // m_refData = NULL; done in the base class ctor
 220 }
 221
 222 wxGDIImageRefData *wxBitmap::CreateData() const
 223 {
 224     return new wxBitmapRefData;
 225 }
 226
 227 #ifdef __WIN32__
 228
 229 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 230 {
 231 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 232     // it may be either HICON or HCURSOR
 233     HICON hicon = (HICON)icon.GetHandle();
 234
 235     ICONINFO iconInfo;
 236     if ( !::GetIconInfo(hicon, &iconInfo) )
 237     {
 238         wxLogLastError(wxT("GetIconInfo"));
 239
 240         return FALSE;
 241     }
 242
 243     wxBitmapRefData *refData = new wxBitmapRefData;
 244     m_refData = refData;
 245
 246     int w = icon.GetWidth(),
 247         h = icon.GetHeight();
 248
 249     refData->m_width = w;
 250     refData->m_height = h;
 251     refData->m_depth = wxDisplayDepth();
 252
 253     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 254
 255     // the mask returned by GetIconInfo() is inversed compared to the usual
 256     // wxWin convention
 257     refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
 258
 259
 260     // delete the old one now as we don't need it any more
 261     ::DeleteObject(iconInfo.hbmMask);
 262
 263 #if WXWIN_COMPATIBILITY_2
 264     refData->m_ok = TRUE;
 265 #endif // WXWIN_COMPATIBILITY_2
 266
 267     return TRUE;
 268 #else
 269     return FALSE;
 270 #endif
 271 }
 272
 273 #endif // Win32
 274
 275 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
 276 {
 277     UnRef();
 278
 279     if ( !cursor.Ok() )
 280         return FALSE;
 281
 282 #ifdef __WIN16__
 283     wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
 284
 285     return FALSE;
 286 #else
 287     return CopyFromIconOrCursor(cursor);
 288 #endif // Win16
 289 }
 290
 291 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 292 {
 293     UnRef();
 294
 295     if ( !icon.Ok() )
 296         return FALSE;
 297
 298     // GetIconInfo() doesn't exist under Win16 and I don't know any other way
 299     // to create a bitmap from icon there - but using this way we won't have
 300     // the mask (FIXME)
 301 #ifdef __WIN16__
 302     int width = icon.GetWidth(),
 303         height = icon.GetHeight();
 304
 305     // copy the icon to the bitmap
 306     ScreenHDC hdcScreen;
 307     HDC hdc = ::CreateCompatibleDC(hdcScreen);
 308     HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
 309     HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
 310
 311     ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
 312
 313     ::SelectObject(hdc, hbmpOld);
 314     ::DeleteDC(hdc);
 315
 316     wxBitmapRefData *refData = new wxBitmapRefData;
 317     m_refData = refData;
 318
 319     refData->m_width = width;
 320     refData->m_height = height;
 321     refData->m_depth = wxDisplayDepth();
 322
 323     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 324
 325 #if WXWIN_COMPATIBILITY_2
 326     refData->m_ok = TRUE;
 327 #endif // WXWIN_COMPATIBILITY_2
 328
 329     return TRUE;
 330 #else // Win32
 331     return CopyFromIconOrCursor(icon);
 332 #endif // Win16/Win32
 333 }
 334
 335 #if wxUSE_WXDIB
 336 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
 337 {
 338     wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
 339
 340     HBITMAP hbitmap = dib.CreateDDB();
 341     if ( !hbitmap )
 342         return FALSE;
 343
 344     UnRef();
 345
 346     wxBitmapRefData *refData = new wxBitmapRefData;
 347     m_refData = refData;
 348
 349     refData->m_width = dib.GetWidth();
 350     refData->m_height = dib.GetHeight();
 351     refData->m_depth = dib.GetDepth();
 352
 353     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 354
 355 #if wxUSE_PALETTE
 356     wxPalette *palette = dib.CreatePalette();
 357     if ( palette )
 358     {
 359         refData->m_bitmapPalette = *palette;
 360     }
 361
 362     delete palette;
 363 #endif // wxUSE_PALETTE
 364
 365     return TRUE;
 366 }
 367 #endif
 368
 369 wxBitmap::~wxBitmap()
 370 {
 371 }
 372
 373 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 374 {
 375     Init();
 376
 377 #ifndef __WXMICROWIN__
 378     wxBitmapRefData *refData = new wxBitmapRefData;
 379     m_refData = refData;
 380
 381     refData->m_width = width;
 382     refData->m_height = height;
 383     refData->m_depth = depth;
 384
 385     char *data;
 386     if ( depth == 1 )
 387     {
 388         // we assume that it is in XBM format which is not quite the same as
 389         // the format CreateBitmap() wants because the order of bytes in the
 390         // line is inversed!
 391         const size_t bytesPerLine = (width + 7) / 8;
 392         const size_t padding = bytesPerLine % 2;
 393         const size_t len = height * ( padding + bytesPerLine );
 394         data = (char *)malloc(len);
 395         const char *src = bits;
 396         char *dst = data;
 397
 398         for ( int rows = 0; rows < height; rows++ )
 399         {
 400             for ( size_t cols = 0; cols < bytesPerLine; cols++ )
 401             {
 402                 unsigned char val = *src++;
 403                 unsigned char reversed = 0;
 404
 405                 for ( int bits = 0; bits < 8; bits++)
 406                 {
 407                     reversed <<= 1;
 408                     reversed |= (val & 0x01);
 409                     val >>= 1;
 410                 }
 411                 *dst++ = reversed;
 412             }
 413
 414             if ( padding )
 415                 *dst++ = 0;
 416         }
 417     }
 418     else
 419     {
 420         // bits should already be in Windows standard format
 421         data = (char *)bits;    // const_cast is harmless
 422     }
 423
 424     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
 425     if ( !hbmp )
 426     {
 427         wxLogLastError(wxT("CreateBitmap"));
 428     }
 429
 430     if ( data != bits )
 431     {
 432         free(data);
 433     }
 434
 435     SetHBITMAP((WXHBITMAP)hbmp);
 436 #endif
 437 }
 438
 439 // Create from XPM data
 440 bool wxBitmap::CreateFromXpm(const char **data)
 441 {
 442 #if wxUSE_IMAGE && wxUSE_XPM
 443     Init();
 444
 445     wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
 446
 447     wxXPMDecoder decoder;
 448     wxImage img = decoder.ReadData(data);
 449     wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
 450
 451     *this = wxBitmap(img);
 452     return TRUE;
 453 #else
 454     return FALSE;
 455 #endif
 456 }
 457
 458 wxBitmap::wxBitmap(int w, int h, int d)
 459 {
 460     Init();
 461
 462     (void)Create(w, h, d);
 463 }
 464
 465 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
 466 {
 467     Init();
 468
 469     (void)Create(w, h, dc);
 470 }
 471
 472 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
 473 {
 474     Init();
 475
 476     (void)Create(data, type, width, height, depth);
 477 }
 478
 479 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
 480 {
 481     Init();
 482
 483     LoadFile(filename, (int)type);
 484 }
 485
 486 bool wxBitmap::Create(int width, int height, int depth)
 487 {
 488     return DoCreate(width, height, depth, 0);
 489 }
 490
 491 bool wxBitmap::Create(int width, int height, const wxDC& dc)
 492 {
 493     wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
 494
 495     return DoCreate(width, height, -1, dc.GetHDC());
 496 }
 497
 498 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
 499 {
 500     UnRef();
 501
 502     m_refData = new wxBitmapRefData;
 503
 504     GetBitmapData()->m_width = w;
 505     GetBitmapData()->m_height = h;
 506
 507     HBITMAP hbmp;
 508
 509     if ( wxShouldCreateDIB(w, h, d, hdc) )
 510     {
 511         if ( d == -1 )
 512         {
 513             // create DIBs without alpha channel by default
 514             d = 24;
 515         }
 516
 517         wxDIB dib(w, h, d);
 518         if ( !dib.IsOk() )
 519            return FALSE;
 520
 521         // don't delete the DIB section in dib object dtor
 522         hbmp = dib.Detach();
 523
 524         GetBitmapData()->m_isDIB = TRUE;
 525         GetBitmapData()->m_depth = d;
 526     }
 527     else // create a DDB
 528     {
 529         if ( d == -1 )
 530             d = wxDisplayDepth();
 531
 532         GetBitmapData()->m_depth = d;
 533
 534 #ifndef __WXMICROWIN__
 535         if ( d > 0 )
 536         {
 537             hbmp = ::CreateBitmap(w, h, 1, d, NULL);
 538             if ( !hbmp )
 539             {
 540                 wxLogLastError(wxT("CreateBitmap"));
 541             }
 542         }
 543         else
 544 #endif // !__WXMICROWIN__
 545         {
 546             ScreenHDC dc;
 547             hbmp = ::CreateCompatibleBitmap(dc, w, h);
 548             if ( !hbmp )
 549             {
 550                 wxLogLastError(wxT("CreateCompatibleBitmap"));
 551             }
 552
 553             GetBitmapData()->m_depth = wxDisplayDepth();
 554         }
 555     }
 556
 557     SetHBITMAP((WXHBITMAP)hbmp);
 558
 559 #if WXWIN_COMPATIBILITY_2
 560     GetBitmapData()->m_ok = hbmp != 0;
 561 #endif // WXWIN_COMPATIBILITY_2
 562
 563     return Ok();
 564 }
 565
 566 #if wxUSE_IMAGE
 567
 568 // ----------------------------------------------------------------------------
 569 // wxImage to/from conversions for Microwin
 570 // ----------------------------------------------------------------------------
 571
 572 // Microwin versions are so different from normal ones that it really doesn't
 573 // make sense to use #ifdefs inside the function bodies
 574 #ifdef __WXMICROWIN__
 575
 576 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
 577 {
 578     // Set this to 1 to experiment with mask code,
 579     // which currently doesn't work
 580     #define USE_MASKS 0
 581
 582     m_refData = new wxBitmapRefData();
 583
 584     // Initial attempt at a simple-minded implementation.
 585     // The bitmap will always be created at the screen depth,
 586     // so the 'depth' argument is ignored.
 587
 588     HDC hScreenDC = ::GetDC(NULL);
 589     int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
 590
 591     HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
 592     HBITMAP hMaskBitmap = NULL;
 593     HBITMAP hOldMaskBitmap = NULL;
 594     HDC hMaskDC = NULL;
 595     unsigned char maskR = 0;
 596     unsigned char maskG = 0;
 597     unsigned char maskB = 0;
 598
 599     //    printf("Created bitmap %d\n", (int) hBitmap);
 600     if (hBitmap == NULL)
 601     {
 602         ::ReleaseDC(NULL, hScreenDC);
 603         return FALSE;
 604     }
 605     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 606
 607     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 608     ::ReleaseDC(NULL, hScreenDC);
 609
 610     // created an mono-bitmap for the possible mask
 611     bool hasMask = image.HasMask();
 612
 613     if ( hasMask )
 614     {
 615 #if USE_MASKS
 616         // FIXME: we should be able to pass bpp = 1, but
 617         // GdBlit can't handle a different depth
 618 #if 0
 619         hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
 620 #else
 621         hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
 622 #endif
 623         maskR = image.GetMaskRed();
 624         maskG = image.GetMaskGreen();
 625         maskB = image.GetMaskBlue();
 626
 627         if (!hMaskBitmap)
 628         {
 629             hasMask = FALSE;
 630         }
 631         else
 632         {
 633             hScreenDC = ::GetDC(NULL);
 634             hMaskDC = ::CreateCompatibleDC(hScreenDC);
 635            ::ReleaseDC(NULL, hScreenDC);
 636
 637             hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
 638         }
 639 #else
 640         hasMask = FALSE;
 641 #endif
 642     }
 643
 644     int i, j;
 645     for (i = 0; i < image.GetWidth(); i++)
 646     {
 647         for (j = 0; j < image.GetHeight(); j++)
 648         {
 649             unsigned char red = image.GetRed(i, j);
 650             unsigned char green = image.GetGreen(i, j);
 651             unsigned char blue = image.GetBlue(i, j);
 652
 653             ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
 654
 655             if (hasMask)
 656             {
 657                 // scan the bitmap for the transparent colour and set the corresponding
 658                 // pixels in the mask to BLACK and the rest to WHITE
 659                 if (maskR == red && maskG == green && maskB == blue)
 660                     ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
 661                 else
 662                     ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
 663             }
 664         }
 665     }
 666
 667     ::SelectObject(hMemDC, hOldBitmap);
 668     ::DeleteDC(hMemDC);
 669     if (hasMask)
 670     {
 671         ::SelectObject(hMaskDC, hOldMaskBitmap);
 672         ::DeleteDC(hMaskDC);
 673
 674         ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
 675     }
 676
 677     SetWidth(image.GetWidth());
 678     SetHeight(image.GetHeight());
 679     SetDepth(screenDepth);
 680     SetHBITMAP( (WXHBITMAP) hBitmap );
 681
 682 #if wxUSE_PALETTE
 683     // Copy the palette from the source image
 684     SetPalette(image.GetPalette());
 685 #endif // wxUSE_PALETTE
 686
 687 #if WXWIN_COMPATIBILITY_2
 688     // check the wxBitmap object
 689     GetBitmapData()->SetOk();
 690 #endif // WXWIN_COMPATIBILITY_2
 691
 692     return TRUE;
 693 }
 694
 695 wxImage wxBitmap::ConvertToImage() const
 696 {
 697     // Initial attempt at a simple-minded implementation.
 698     // The bitmap will always be created at the screen depth,
 699     // so the 'depth' argument is ignored.
 700     // TODO: transparency (create a mask image)
 701
 702     if (!Ok())
 703     {
 704         wxFAIL_MSG( wxT("bitmap is invalid") );
 705         return wxNullImage;
 706     }
 707
 708     wxImage image;
 709
 710     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 711
 712     // create an wxImage object
 713     int width = GetWidth();
 714     int height = GetHeight();
 715     image.Create( width, height );
 716     unsigned char *data = image.GetData();
 717     if( !data )
 718     {
 719         wxFAIL_MSG( wxT("could not allocate data for image") );
 720         return wxNullImage;
 721     }
 722
 723     HDC hScreenDC = ::GetDC(NULL);
 724
 725     HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
 726     ::ReleaseDC(NULL, hScreenDC);
 727
 728     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 729
 730     HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
 731
 732     int i, j;
 733     for (i = 0; i < GetWidth(); i++)
 734     {
 735         for (j = 0; j < GetHeight(); j++)
 736         {
 737             COLORREF color = ::GetPixel(hMemDC, i, j);
 738             unsigned char red = GetRValue(color);
 739             unsigned char green = GetGValue(color);
 740             unsigned char blue = GetBValue(color);
 741
 742             image.SetRGB(i, j, red, green, blue);
 743         }
 744     }
 745
 746     ::SelectObject(hMemDC, hOldBitmap);
 747     ::DeleteDC(hMemDC);
 748
 749 #if wxUSE_PALETTE
 750     // Copy the palette from the source image
 751     if (GetPalette())
 752         image.SetPalette(* GetPalette());
 753 #endif // wxUSE_PALETTE
 754
 755     return image;
 756 }
 757
 758 #endif // __WXMICROWIN__
 759
 760 // ----------------------------------------------------------------------------
 761 // wxImage to/from conversions
 762 // ----------------------------------------------------------------------------
 763
 764 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
 765 {
 766     return CreateFromImage(image, depth, 0);
 767 }
 768
 769 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
 770 {
 771     wxCHECK_MSG( dc.Ok(), FALSE,
 772                     _T("invalid HDC in wxBitmap::CreateFromImage()") );
 773
 774     return CreateFromImage(image, -1, dc.GetHDC());
 775 }
 776
 777 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
 778 {
 779     wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
 780
 781     UnRef();
 782
 783     // first convert the image to DIB
 784     const int h = image.GetHeight();
 785     const int w = image.GetWidth();
 786
 787     wxDIB dib(image);
 788     if ( !dib.IsOk() )
 789         return FALSE;
 790
 791
 792     // store the bitmap parameters
 793     wxBitmapRefData *refData = new wxBitmapRefData;
 794     refData->m_width = w;
 795     refData->m_height = h;
 796     refData->m_hasAlpha = image.HasAlpha();
 797
 798     m_refData = refData;
 799
 800
 801     // next either store DIB as is or create a DDB from it
 802     HBITMAP hbitmap;
 803
 804     // are we going to use DIB?
 805     //
 806     // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
 807     if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
 808     {
 809         // don't delete the DIB section in dib object dtor
 810         hbitmap = dib.Detach();
 811
 812         refData->m_isDIB = TRUE;
 813         refData->m_depth = dib.GetDepth();
 814     }
 815     else // we need to convert DIB to DDB
 816     {
 817         hbitmap = dib.CreateDDB((HDC)hdc);
 818
 819         refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
 820     }
 821
 822     // validate this object
 823     SetHBITMAP((WXHBITMAP)hbitmap);
 824
 825 #if WXWIN_COMPATIBILITY_2
 826     m_refData->m_ok = TRUE;
 827 #endif // WXWIN_COMPATIBILITY_2
 828
 829     // finally also set the mask if we have one
 830     if ( image.HasMask() )
 831     {
 832         SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
 833                                            image.GetMaskGreen(),
 834                                            image.GetMaskBlue())));
 835     }
 836
 837     return TRUE;
 838 }
 839
 840 wxImage wxBitmap::ConvertToImage() const
 841 {
 842     // FIXME: this is untested code for WinCE, and
 843     // the mask is not yet handled.
 844     // For tips, see:
 845     // http://www.codeproject.com/bitmap/dibsection.asp?print=true
 846
 847 #ifdef __WXWINCE__
 848     // the colour used as transparent one in wxImage and the one it is replaced
 849     // with when it really occurs in the bitmap
 850     static const int MASK_RED = 1;
 851     static const int MASK_GREEN = 2;
 852     static const int MASK_BLUE = 3;
 853     static const int MASK_BLUE_REPLACEMENT = 2;
 854
 855     wxImage image;
 856
 857     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
 858
 859     // create an wxImage object
 860     int width = GetWidth();
 861     int height = GetHeight();
 862     image.Create( width, height );
 863     unsigned char *data = image.GetData();
 864     if( !data )
 865     {
 866         wxFAIL_MSG( wxT("could not allocate data for image") );
 867         return wxNullImage;
 868     }
 869
 870     // calc the number of bytes per scanline and padding in the DIB
 871     int bytePerLine = width*3;
 872     int sizeDWORD = sizeof( DWORD );
 873     int lineBoundary =  bytePerLine % sizeDWORD;
 874     int padding = 0;
 875     if( lineBoundary > 0 )
 876     {
 877         padding = sizeDWORD - lineBoundary;
 878         bytePerLine += padding;
 879     }
 880
 881     // create a DIB header
 882     int headersize = sizeof(BITMAPINFOHEADER);
 883     BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
 884     if( !lpDIBh )
 885     {
 886         wxFAIL_MSG( wxT("could not allocate data for DIB header") );
 887         free( data );
 888         return wxNullImage;
 889     }
 890     // Fill in the DIB header
 891     lpDIBh->bmiHeader.biSize = headersize;
 892     lpDIBh->bmiHeader.biWidth = width;
 893     lpDIBh->bmiHeader.biHeight = -height;
 894     lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
 895     lpDIBh->bmiHeader.biPlanes = 1;
 896     lpDIBh->bmiHeader.biBitCount = 24;
 897     lpDIBh->bmiHeader.biCompression = BI_RGB;
 898     lpDIBh->bmiHeader.biClrUsed = 0;
 899     // These seem not really needed for our purpose here.
 900     lpDIBh->bmiHeader.biClrImportant = 0;
 901     lpDIBh->bmiHeader.biXPelsPerMeter = 0;
 902     lpDIBh->bmiHeader.biYPelsPerMeter = 0;
 903
 904     // memory for DIB data is allocated by CreateDIBSection
 905     void *lpBits = NULL;
 906
 907     // copy data from the device-dependent bitmap to the DIB
 908     HDC hdc = ::GetDC(NULL);
 909     HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
 910
 911     HBITMAP hBitmapSection = ::CreateDIBSection( hdc, lpDIBh, DIB_RGB_COLORS, & lpBits, NULL, 0 );
 912     if (!hBitmapSection)
 913     {
 914         wxFAIL_MSG( wxT("could not create a DIB section") );
 915         return wxNullImage;
 916     }
 917
 918     // Copy the image from the DDB to the DIBSection
 919     // Need to copy the supplied bitmap onto the newly created DIBsection
 920     HDC hMemDC = CreateCompatibleDC(hdc);
 921         HDC hCopyDC = CreateCompatibleDC(hdc);
 922
 923     if (! hMemDC || ! hCopyDC)
 924     {
 925         wxFAIL_MSG( wxT("unable to create compatible DCs") );
 926         return wxNullImage;
 927     }
 928
 929 #if 0
 930     if (m_hPal)
 931     {
 932         SelectPalette(hMemDC, m_hPal, FALSE);   RealizePalette(hMemDC);
 933         SelectPalette(hCopyDC, m_hPal, FALSE);  RealizePalette(hCopyDC);
 934     }
 935 #endif
 936
 937     HBITMAP hOldMemBitmap  = (HBITMAP) SelectObject(hMemDC,  hBitmap);
 938     HBITMAP hOldCopyBitmap = (HBITMAP) SelectObject(hCopyDC, hBitmapSection);
 939
 940     BitBlt(hCopyDC, 0, 0, GetWidth(), GetHeight(), hMemDC, 0, 0, SRCCOPY);
 941
 942     SelectObject(hMemDC,  hOldMemBitmap);
 943     SelectObject(hCopyDC, hOldCopyBitmap);
 944     DeleteDC(hMemDC);
 945     DeleteDC(hCopyDC);
 946
 947 #if 0
 948     if (m_hPal)
 949     {
 950                 HGDIOBJ hObj = ::GetStockObject(DEFAULT_PALETTE);
 951         SelectObject(hMemDC, hObj);
 952         SelectObject(hCopyDC, hObj);
 953     }
 954 #endif
 955
 956         ReleaseDC(NULL, hdc);
 957
 958     // copy DIB data into the wxImage object
 959     int i, j;
 960     unsigned char *ptdata = data;
 961     unsigned char *ptbits = (unsigned char*) lpBits;
 962     for( i=0; i<height; i++ )
 963     {
 964         for( j=0; j<width; j++ )
 965         {
 966             *(ptdata++) = *(ptbits+2);
 967             *(ptdata++) = *(ptbits+1);
 968             *(ptdata++) = *(ptbits  );
 969             ptbits += 3;
 970         }
 971         ptbits += padding;
 972     }
 973
 974     // TODO
 975 #if 0
 976     // similarly, set data according to the possible mask bitmap
 977     if( GetMask() && GetMask()->GetMaskBitmap() )
 978     {
 979         hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
 980         // memory DC created, color set, data copied, and memory DC deleted
 981         HDC memdc = ::CreateCompatibleDC( hdc );
 982         ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
 983         ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
 984         ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
 985         ::DeleteDC( memdc );
 986         ptdata = data;
 987         ptbits = lpBits;
 988         for( i=0; i<height; i++ )
 989         {
 990             for( j=0; j<width; j++ )
 991             {
 992                 // is this pixel transparent?
 993                 if ( *ptbits != 0 )
 994                 {
 995                     if ( (ptdata[0] == MASK_RED) &&
 996                             (ptdata[1] == MASK_GREEN) &&
 997                                 (ptdata[2] == MASK_BLUE) )
 998                     {
 999                         // we have to fudge the colour a bit to prevent this
1000                         // pixel from appearing transparent
1001                         ptdata[2] = MASK_BLUE_REPLACEMENT;
1002                     }
1003                     ptdata += 3;
1004                 }
1005                 else // masked pixel
1006                 {
1007                     *(ptdata++)  = MASK_RED;
1008                     *(ptdata++)  = MASK_GREEN;
1009                     *(ptdata++)  = MASK_BLUE;
1010                 }
1011                 ptbits += 3;
1012             }
1013             ptbits += padding;
1014         }
1015
1016         image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
1017         image.SetMask( TRUE );
1018     }
1019     else
1020 #endif
1021     {
1022         image.SetMask( FALSE );
1023     }
1024
1025     // free allocated resources
1026     ::ReleaseDC(NULL, hdc);
1027     free(lpDIBh);
1028
1029     // Delete the DIB section
1030     ::DeleteObject(hBitmapSection);
1031
1032     return image;
1033 #else
1034     // the colour used as transparent one in wxImage and the one it is replaced
1035     // with when it really occurs in the bitmap
1036     static const int MASK_RED = 1;
1037     static const int MASK_GREEN = 2;
1038     static const int MASK_BLUE = 3;
1039     static const int MASK_BLUE_REPLACEMENT = 2;
1040
1041     wxImage image;
1042
1043     wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
1044
1045     // create an wxImage object
1046     int width = GetWidth();
1047     int height = GetHeight();
1048     image.Create( width, height );
1049     unsigned char *data = image.GetData();
1050     if( !data )
1051     {
1052         wxFAIL_MSG( wxT("could not allocate data for image") );
1053         return wxNullImage;
1054     }
1055
1056     // calc the number of bytes per scanline and padding in the DIB
1057     int bytePerLine = width*3;
1058     int sizeDWORD = sizeof( DWORD );
1059     int lineBoundary =  bytePerLine % sizeDWORD;
1060     int padding = 0;
1061     if( lineBoundary > 0 )
1062     {
1063         padding = sizeDWORD - lineBoundary;
1064         bytePerLine += padding;
1065     }
1066
1067     // create a DIB header
1068     int headersize = sizeof(BITMAPINFOHEADER);
1069     BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
1070     if( !lpDIBh )
1071     {
1072         wxFAIL_MSG( wxT("could not allocate data for DIB header") );
1073         free( data );
1074         return wxNullImage;
1075     }
1076     // Fill in the DIB header
1077     lpDIBh->bmiHeader.biSize = headersize;
1078     lpDIBh->bmiHeader.biWidth = width;
1079     lpDIBh->bmiHeader.biHeight = -height;
1080     lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
1081     lpDIBh->bmiHeader.biPlanes = 1;
1082     lpDIBh->bmiHeader.biBitCount = 24;
1083     lpDIBh->bmiHeader.biCompression = BI_RGB;
1084     lpDIBh->bmiHeader.biClrUsed = 0;
1085     // These seem not really needed for our purpose here.
1086     lpDIBh->bmiHeader.biClrImportant = 0;
1087     lpDIBh->bmiHeader.biXPelsPerMeter = 0;
1088     lpDIBh->bmiHeader.biYPelsPerMeter = 0;
1089     // memory for DIB data
1090     unsigned char *lpBits;
1091     lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
1092     if( !lpBits )
1093     {
1094         wxFAIL_MSG( wxT("could not allocate data for DIB") );
1095         free( data );
1096         free( lpDIBh );
1097         return wxNullImage;
1098     }
1099
1100     // copy data from the device-dependent bitmap to the DIB
1101     HDC hdc = ::GetDC(NULL);
1102     HBITMAP hbitmap;
1103     hbitmap = (HBITMAP) GetHBITMAP();
1104     ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
1105
1106     // copy DIB data into the wxImage object
1107     int i, j;
1108     unsigned char *ptdata = data;
1109     unsigned char *ptbits = lpBits;
1110     for( i=0; i<height; i++ )
1111     {
1112         for( j=0; j<width; j++ )
1113         {
1114             *(ptdata++) = *(ptbits+2);
1115             *(ptdata++) = *(ptbits+1);
1116             *(ptdata++) = *(ptbits  );
1117             ptbits += 3;
1118         }
1119         ptbits += padding;
1120     }
1121
1122     // similarly, set data according to the possible mask bitmap
1123     if( GetMask() && GetMask()->GetMaskBitmap() )
1124     {
1125         hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
1126         // memory DC created, color set, data copied, and memory DC deleted
1127         HDC memdc = ::CreateCompatibleDC( hdc );
1128         ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
1129         ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
1130         ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
1131         ::DeleteDC( memdc );
1132         ptdata = data;
1133         ptbits = lpBits;
1134         for( i=0; i<height; i++ )
1135         {
1136             for( j=0; j<width; j++ )
1137             {
1138                 // is this pixel transparent?
1139                 if ( *ptbits != 0 )
1140                 {
1141                     if ( (ptdata[0] == MASK_RED) &&
1142                             (ptdata[1] == MASK_GREEN) &&
1143                                 (ptdata[2] == MASK_BLUE) )
1144                     {
1145                         // we have to fudge the colour a bit to prevent this
1146                         // pixel from appearing transparent
1147                         ptdata[2] = MASK_BLUE_REPLACEMENT;
1148                     }
1149                     ptdata += 3;
1150                 }
1151                 else // masked pixel
1152                 {
1153                     *(ptdata++)  = MASK_RED;
1154                     *(ptdata++)  = MASK_GREEN;
1155                     *(ptdata++)  = MASK_BLUE;
1156                 }
1157                 ptbits += 3;
1158             }
1159             ptbits += padding;
1160         }
1161
1162         image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
1163         image.SetMask( TRUE );
1164     }
1165     else
1166     {
1167         image.SetMask( FALSE );
1168     }
1169     // free allocated resources
1170     ::ReleaseDC(NULL, hdc);
1171     free(lpDIBh);
1172     free(lpBits);
1173
1174     return image;
1175 #endif
1176 }
1177
1178 #endif // wxUSE_IMAGE
1179
1180 // ----------------------------------------------------------------------------
1181 // loading and saving bitmaps
1182 // ----------------------------------------------------------------------------
1183
1184 bool wxBitmap::LoadFile(const wxString& filename, long type)
1185 {
1186     UnRef();
1187
1188     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1189
1190     if ( handler )
1191     {
1192         m_refData = new wxBitmapRefData;
1193
1194         return handler->LoadFile(this, filename, type, -1, -1);
1195     }
1196 #if wxUSE_IMAGE
1197     else
1198     {
1199         wxImage image;
1200         if ( image.LoadFile( filename, type ) && image.Ok() )
1201         {
1202             *this = wxBitmap(image);
1203
1204             return TRUE;
1205         }
1206     }
1207 #endif // wxUSE_IMAGE
1208
1209     return FALSE;
1210 }
1211
1212 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
1213 {
1214     UnRef();
1215
1216     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1217
1218     if ( !handler )
1219     {
1220         wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1221
1222         return FALSE;
1223     }
1224
1225     m_refData = new wxBitmapRefData;
1226
1227     return handler->Create(this, data, type, width, height, depth);
1228 }
1229
1230 bool wxBitmap::SaveFile(const wxString& filename,
1231                         int type,
1232                         const wxPalette *palette)
1233 {
1234     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1235
1236     if ( handler )
1237     {
1238         return handler->SaveFile(this, filename, type, palette);
1239     }
1240 #if wxUSE_IMAGE
1241     else
1242     {
1243         // FIXME what about palette? shouldn't we use it?
1244         wxImage image = ConvertToImage();
1245         if ( image.Ok() )
1246         {
1247             return image.SaveFile(filename, type);
1248         }
1249     }
1250 #endif // wxUSE_IMAGE
1251
1252     return FALSE;
1253 }
1254
1255 // ----------------------------------------------------------------------------
1256 // sub bitmap extraction
1257 // ----------------------------------------------------------------------------
1258
1259 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1260 {
1261     wxCHECK_MSG( Ok() &&
1262                  (rect.x >= 0) && (rect.y >= 0) &&
1263                  (rect.x+rect.width <= GetWidth()) &&
1264                  (rect.y+rect.height <= GetHeight()),
1265                  wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1266
1267     wxBitmap ret( rect.width, rect.height );
1268     wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1269
1270 #ifndef __WXMICROWIN__
1271     // TODO: copy alpha channel data if any
1272
1273     // copy bitmap data
1274     MemoryHDC dcSrc,
1275               dcDst;
1276
1277     {
1278         SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1279                     selectDst(dcDst, GetHbitmapOf(ret));
1280
1281         if ( !selectSrc || !selectDst )
1282         {
1283             wxLogLastError(_T("SelectObjct(hBitmap)"));
1284         }
1285
1286         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1287                        dcSrc, rect.x, rect.y, SRCCOPY) )
1288         {
1289             wxLogLastError(_T("BitBlt"));
1290         }
1291     }
1292
1293     // copy mask if there is one
1294     if ( GetMask() )
1295     {
1296         HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1297
1298         SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1299                     selectDst(dcDst, hbmpMask);
1300
1301         if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1302                        dcSrc, rect.x, rect.y, SRCCOPY) )
1303         {
1304             wxLogLastError(_T("BitBlt"));
1305         }
1306
1307         wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1308         ret.SetMask(mask);
1309     }
1310 #endif // !__WXMICROWIN__
1311
1312     return ret;
1313 }
1314
1315 // ----------------------------------------------------------------------------
1316 // wxBitmap accessors
1317 // ----------------------------------------------------------------------------
1318
1319 #if wxUSE_PALETTE
1320 wxPalette* wxBitmap::GetPalette() const
1321 {
1322     return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1323                            : (wxPalette *) NULL;
1324 }
1325 #endif
1326
1327 wxMask *wxBitmap::GetMask() const
1328 {
1329     return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1330 }
1331
1332 #ifdef __WXDEBUG__
1333
1334 wxDC *wxBitmap::GetSelectedInto() const
1335 {
1336     return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1337 }
1338
1339 #endif
1340
1341 #if WXWIN_COMPATIBILITY_2_4
1342
1343 int wxBitmap::GetQuality() const
1344 {
1345     return 0;
1346 }
1347
1348 #endif // WXWIN_COMPATIBILITY_2_4
1349
1350 void wxBitmap::UseAlpha()
1351 {
1352     if ( GetBitmapData() )
1353         GetBitmapData()->m_hasAlpha = true;
1354 }
1355
1356 bool wxBitmap::HasAlpha() const
1357 {
1358     return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1359 }
1360
1361 // ----------------------------------------------------------------------------
1362 // wxBitmap setters
1363 // ----------------------------------------------------------------------------
1364
1365 #ifdef __WXDEBUG__
1366
1367 void wxBitmap::SetSelectedInto(wxDC *dc)
1368 {
1369     if ( GetBitmapData() )
1370         GetBitmapData()->m_selectedInto = dc;
1371 }
1372
1373 #endif
1374
1375 #if wxUSE_PALETTE
1376
1377 void wxBitmap::SetPalette(const wxPalette& palette)
1378 {
1379     EnsureHasData();
1380
1381     GetBitmapData()->m_bitmapPalette = palette;
1382 }
1383
1384 #endif // wxUSE_PALETTE
1385
1386 void wxBitmap::SetMask(wxMask *mask)
1387 {
1388     EnsureHasData();
1389
1390     GetBitmapData()->SetMask(mask);
1391 }
1392
1393 #if WXWIN_COMPATIBILITY_2
1394
1395 void wxBitmap::SetOk(bool isOk)
1396 {
1397     EnsureHasData();
1398
1399     GetBitmapData()->m_ok = isOk;
1400 }
1401
1402 #endif // WXWIN_COMPATIBILITY_2
1403
1404 #if WXWIN_COMPATIBILITY_2_4
1405
1406 void wxBitmap::SetQuality(int WXUNUSED(quality))
1407 {
1408 }
1409
1410 #endif // WXWIN_COMPATIBILITY_2_4
1411
1412 // ----------------------------------------------------------------------------
1413 // raw bitmap access support
1414 // ----------------------------------------------------------------------------
1415
1416 #ifdef wxHAVE_RAW_BITMAP
1417 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1418 {
1419 #if wxUSE_WXDIB
1420     if ( !Ok() )
1421     {
1422         // no bitmap, no data (raw or otherwise)
1423         return NULL;
1424     }
1425
1426     // if we're already a DIB we can access our data directly, but if not we
1427     // need to convert this DDB to a DIB section and use it for raw access and
1428     // then convert it back
1429     HBITMAP hDIB;
1430     if ( !GetBitmapData()->m_isDIB )
1431     {
1432         wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
1433                         _T("GetRawData() may be called only once") );
1434
1435         wxDIB *dib = new wxDIB(*this);
1436         if ( !dib->IsOk() )
1437         {
1438             delete dib;
1439
1440             return NULL;
1441         }
1442
1443         // we'll free it in UngetRawData()
1444         GetBitmapData()->m_dib = dib;
1445
1446         hDIB = dib->GetHandle();
1447     }
1448     else // we're a DIB
1449     {
1450         hDIB = GetHbitmap();
1451     }
1452
1453     DIBSECTION ds;
1454     if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1455     {
1456         wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1457
1458         return NULL;
1459     }
1460
1461     // check that the bitmap is in correct format
1462     if ( ds.dsBm.bmBitsPixel != bpp )
1463     {
1464         wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1465
1466         return NULL;
1467     }
1468
1469     // ok, store the relevant info in wxPixelDataBase
1470     const LONG h = ds.dsBm.bmHeight;
1471
1472     data.m_width = ds.dsBm.bmWidth;
1473     data.m_height = h;
1474
1475     // remember that DIBs are stored in top to bottom order!
1476     const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1477     data.m_stride = -bytesPerRow;
1478
1479     char *bits = (char *)ds.dsBm.bmBits;
1480     if ( h > 1 )
1481     {
1482         bits += (h - 1)*bytesPerRow;
1483     }
1484
1485     return bits;
1486 #else
1487     return NULL;
1488 #endif
1489 }
1490
1491 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1492 {
1493 #if wxUSE_WXDIB
1494     if ( !Ok() )
1495         return;
1496
1497     // the cast is ugly but we can't do without it and without making this
1498     // function template (and hence inline) unfortunately
1499     typedef wxPixelData<wxBitmap, wxAlphaPixelFormat> PixelData;
1500     PixelData& data = (PixelData &)dataBase;
1501
1502     if ( !data )
1503     {
1504         // invalid data, don't crash -- but don't assert neither as we're
1505         // called automatically from wxPixelDataBase dtor and so there is no
1506         // way to prevent this from happening
1507         return;
1508     }
1509
1510     if ( GetBitmapData()->m_hasAlpha )
1511     {
1512         // AlphaBlend() wants to have premultiplied source alpha but
1513         // wxRawBitmap API uses normal, not premultiplied, colours, so adjust
1514         // them here now
1515         PixelData::Iterator p(data);
1516
1517         const int w = data.GetWidth();
1518         const int h = data.GetHeight();
1519
1520         for ( int y = 0; y < h; y++ )
1521         {
1522             PixelData::Iterator rowStart = p;
1523
1524             for ( int x = 0; x < w; x++ )
1525             {
1526                 const unsigned alpha = p.Alpha();
1527
1528                 p.Red() = (p.Red() * alpha + 127) / 255;
1529                 p.Blue() = (p.Blue() * alpha + 127) / 255;
1530                 p.Green() = (p.Green() * alpha + 127) / 255;
1531
1532                 ++p;
1533             }
1534
1535             p = rowStart;
1536             p.OffsetY(data, 1);
1537         }
1538
1539         // if we're a DDB we need to convert DIB back to DDB now to make the
1540         // changes made via raw bitmap access effective
1541         if ( !GetBitmapData()->m_isDIB )
1542         {
1543             wxDIB *dib = GetBitmapData()->m_dib;
1544             GetBitmapData()->m_dib = NULL;
1545
1546             // TODO: convert
1547
1548             delete dib;
1549         }
1550     }
1551 #endif
1552 }
1553 #endif // #ifdef wxHAVE_RAW_BITMAP
1554
1555 // ----------------------------------------------------------------------------
1556 // wxMask
1557 // ----------------------------------------------------------------------------
1558
1559 wxMask::wxMask()
1560 {
1561     m_maskBitmap = 0;
1562 }
1563
1564 // Construct a mask from a bitmap and a colour indicating
1565 // the transparent area
1566 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1567 {
1568     m_maskBitmap = 0;
1569     Create(bitmap, colour);
1570 }
1571
1572 // Construct a mask from a bitmap and a palette index indicating
1573 // the transparent area
1574 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1575 {
1576     m_maskBitmap = 0;
1577     Create(bitmap, paletteIndex);
1578 }
1579
1580 // Construct a mask from a mono bitmap (copies the bitmap).
1581 wxMask::wxMask(const wxBitmap& bitmap)
1582 {
1583     m_maskBitmap = 0;
1584     Create(bitmap);
1585 }
1586
1587 wxMask::~wxMask()
1588 {
1589     if ( m_maskBitmap )
1590         ::DeleteObject((HBITMAP) m_maskBitmap);
1591 }
1592
1593 // Create a mask from a mono bitmap (copies the bitmap).
1594 bool wxMask::Create(const wxBitmap& bitmap)
1595 {
1596 #ifndef __WXMICROWIN__
1597     wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1598                  _T("can't create mask from invalid or not monochrome bitmap") );
1599
1600     if ( m_maskBitmap )
1601     {
1602         ::DeleteObject((HBITMAP) m_maskBitmap);
1603         m_maskBitmap = 0;
1604     }
1605
1606     m_maskBitmap = (WXHBITMAP) CreateBitmap(
1607                                             bitmap.GetWidth(),
1608                                             bitmap.GetHeight(),
1609                                             1, 1, 0
1610                                            );
1611     HDC srcDC = CreateCompatibleDC(0);
1612     SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1613     HDC destDC = CreateCompatibleDC(0);
1614     SelectObject(destDC, (HBITMAP) m_maskBitmap);
1615     BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1616     SelectObject(srcDC, 0);
1617     DeleteDC(srcDC);
1618     SelectObject(destDC, 0);
1619     DeleteDC(destDC);
1620     return TRUE;
1621 #else
1622     return FALSE;
1623 #endif
1624 }
1625
1626 // Create a mask from a bitmap and a palette index indicating
1627 // the transparent area
1628 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1629 {
1630     if ( m_maskBitmap )
1631     {
1632         ::DeleteObject((HBITMAP) m_maskBitmap);
1633         m_maskBitmap = 0;
1634     }
1635
1636 #if wxUSE_PALETTE
1637     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1638     {
1639         unsigned char red, green, blue;
1640         if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1641         {
1642             wxColour transparentColour(red, green, blue);
1643             return Create(bitmap, transparentColour);
1644         }
1645     }
1646 #endif // wxUSE_PALETTE
1647
1648     return FALSE;
1649 }
1650
1651 // Create a mask from a bitmap and a colour indicating
1652 // the transparent area
1653 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1654 {
1655 #ifndef __WXMICROWIN__
1656     wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1657
1658     if ( m_maskBitmap )
1659     {
1660         ::DeleteObject((HBITMAP) m_maskBitmap);
1661         m_maskBitmap = 0;
1662     }
1663
1664     int width = bitmap.GetWidth(),
1665         height = bitmap.GetHeight();
1666
1667     // scan the bitmap for the transparent colour and set the corresponding
1668     // pixels in the mask to BLACK and the rest to WHITE
1669     COLORREF maskColour = wxColourToPalRGB(colour);
1670     m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1671
1672     HDC srcDC = ::CreateCompatibleDC(NULL);
1673     HDC destDC = ::CreateCompatibleDC(NULL);
1674     if ( !srcDC || !destDC )
1675     {
1676         wxLogLastError(wxT("CreateCompatibleDC"));
1677     }
1678
1679     bool ok = TRUE;
1680
1681     // SelectObject() will fail
1682     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1683                   _T("bitmap can't be selected in another DC") );
1684
1685     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1686     if ( !hbmpSrcOld )
1687     {
1688         wxLogLastError(wxT("SelectObject"));
1689
1690         ok = FALSE;
1691     }
1692
1693     HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1694     if ( !hbmpDstOld )
1695     {
1696         wxLogLastError(wxT("SelectObject"));
1697
1698         ok = FALSE;
1699     }
1700
1701     if ( ok )
1702     {
1703         // this will create a monochrome bitmap with 0 points for the pixels
1704         // which have the same value as the background colour and 1 for the
1705         // others
1706         ::SetBkColor(srcDC, maskColour);
1707         ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1708     }
1709
1710     ::SelectObject(srcDC, hbmpSrcOld);
1711     ::DeleteDC(srcDC);
1712     ::SelectObject(destDC, hbmpDstOld);
1713     ::DeleteDC(destDC);
1714
1715     return ok;
1716 #else // __WXMICROWIN__
1717     return FALSE;
1718 #endif // __WXMICROWIN__/!__WXMICROWIN__
1719 }
1720
1721 // ----------------------------------------------------------------------------
1722 // wxBitmapHandler
1723 // ----------------------------------------------------------------------------
1724
1725 bool wxBitmapHandler::Create(wxGDIImage *image,
1726                              void *data,
1727                              long flags,
1728                              int width, int height, int depth)
1729 {
1730     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1731
1732     return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1733 }
1734
1735 bool wxBitmapHandler::Load(wxGDIImage *image,
1736                            const wxString& name,
1737                            long flags,
1738                            int width, int height)
1739 {
1740     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1741
1742     return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1743 }
1744
1745 bool wxBitmapHandler::Save(wxGDIImage *image,
1746                            const wxString& name,
1747                            int type)
1748 {
1749     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1750
1751     return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1752 }
1753
1754 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1755                              void *WXUNUSED(data),
1756                              long WXUNUSED(type),
1757                              int WXUNUSED(width),
1758                              int WXUNUSED(height),
1759                              int WXUNUSED(depth))
1760 {
1761     return FALSE;
1762 }
1763
1764 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1765                                const wxString& WXUNUSED(name),
1766                                long WXUNUSED(type),
1767                                int WXUNUSED(desiredWidth),
1768                                int WXUNUSED(desiredHeight))
1769 {
1770     return FALSE;
1771 }
1772
1773 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1774                                const wxString& WXUNUSED(name),
1775                                int WXUNUSED(type),
1776                                const wxPalette *WXUNUSED(palette))
1777 {
1778     return FALSE;
1779 }
1780
1781 // ----------------------------------------------------------------------------
1782 // DIB functions
1783 // ----------------------------------------------------------------------------
1784
1785 #ifndef __WXMICROWIN__
1786 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1787                  HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1788 {
1789    unsigned long   i, headerSize;
1790    LPBITMAPINFO    lpDIBheader = NULL;
1791    LPPALETTEENTRY  lpPe = NULL;
1792
1793
1794    // Allocate space for a DIB header
1795    headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1796    lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1797    lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1798
1799    GetPaletteEntries(hPal, 0, 256, lpPe);
1800
1801    memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1802
1803    // Fill in the static parts of the DIB header
1804    lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1805    lpDIBheader->bmiHeader.biWidth = xSize;
1806    lpDIBheader->bmiHeader.biHeight = ySize;
1807    lpDIBheader->bmiHeader.biPlanes = 1;
1808
1809    // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1810    lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1811    lpDIBheader->bmiHeader.biCompression = BI_RGB;
1812    lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1813    lpDIBheader->bmiHeader.biClrUsed = 256;
1814
1815
1816    // Initialize the DIB palette
1817    for (i = 0; i < 256; i++) {
1818       lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1819       lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1820       lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1821       lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1822    }
1823
1824    *lpDIBHeader = lpDIBheader;
1825
1826    return TRUE;
1827 }
1828
1829 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1830 {
1831     free(lpDIBHeader);
1832 }
1833 #endif
1834
1835 // ----------------------------------------------------------------------------
1836 // global helper functions implemented here
1837 // ----------------------------------------------------------------------------
1838
1839 // helper of wxBitmapToHICON/HCURSOR
1840 static
1841 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1842                              bool iconWanted,
1843                              int hotSpotX,
1844                              int hotSpotY)
1845 {
1846     if ( !bmp.Ok() )
1847     {
1848         // we can't create an icon/cursor form nothing
1849         return 0;
1850     }
1851
1852     wxMask *mask = bmp.GetMask();
1853     if ( !mask )
1854     {
1855         // we must have a mask for an icon, so even if it's probably incorrect,
1856         // do create it (grey is the "standard" transparent colour)
1857         mask = new wxMask(bmp, *wxLIGHT_GREY);
1858     }
1859
1860     ICONINFO iconInfo;
1861     iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
1862     if ( !iconWanted )
1863     {
1864         iconInfo.xHotspot = hotSpotX;
1865         iconInfo.yHotspot = hotSpotY;
1866     }
1867
1868     iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1869     iconInfo.hbmColor = GetHbitmapOf(bmp);
1870
1871     // black out the transparent area to preserve background colour, because
1872     // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1873     // the mask to the dest rect.
1874     {
1875         MemoryHDC dcSrc, dcDst;
1876         SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1877                     selectBitmap(dcDst, iconInfo.hbmColor);
1878
1879         if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1880                        dcSrc, 0, 0, SRCAND) )
1881         {
1882             wxLogLastError(_T("BitBlt"));
1883         }
1884     }
1885
1886     HICON hicon = ::CreateIconIndirect(&iconInfo);
1887
1888     if ( !bmp.GetMask() )
1889     {
1890         // we created the mask, now delete it
1891         delete mask;
1892     }
1893
1894     // delete the inverted mask bitmap we created as well
1895     ::DeleteObject(iconInfo.hbmMask);
1896
1897     return hicon;
1898 }
1899
1900 HICON wxBitmapToHICON(const wxBitmap& bmp)
1901 {
1902     return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1903 }
1904
1905 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1906 {
1907     return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1908 }
1909
1910 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1911 {
1912 #ifndef __WXMICROWIN__
1913     wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1914
1915     // get width/height from the bitmap if not given
1916     if ( !w || !h )
1917     {
1918         BITMAP bm;
1919         ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1920         w = bm.bmWidth;
1921         h = bm.bmHeight;
1922     }
1923
1924     HDC hdcSrc = ::CreateCompatibleDC(NULL);
1925     HDC hdcDst = ::CreateCompatibleDC(NULL);
1926     if ( !hdcSrc || !hdcDst )
1927     {
1928         wxLogLastError(wxT("CreateCompatibleDC"));
1929     }
1930
1931     HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1932     if ( !hbmpInvMask )
1933     {
1934         wxLogLastError(wxT("CreateBitmap"));
1935     }
1936
1937     ::SelectObject(hdcSrc, hbmpMask);
1938     ::SelectObject(hdcDst, hbmpInvMask);
1939     if ( !::BitBlt(hdcDst, 0, 0, w, h,
1940                    hdcSrc, 0, 0,
1941                    NOTSRCCOPY) )
1942     {
1943         wxLogLastError(wxT("BitBlt"));
1944     }
1945
1946     ::DeleteDC(hdcSrc);
1947     ::DeleteDC(hdcDst);
1948
1949     return hbmpInvMask;
1950 #else
1951     return 0;
1952 #endif
1953 }