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fix alpha premultiplying
[wxWidgets.git] / 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 #include "wx/rawbmp.h"
54
55 // missing from mingw32 header
56 #ifndef CLR_INVALID
57 #define CLR_INVALID ((COLORREF)-1)
58 #endif // no CLR_INVALID
59
60 // ----------------------------------------------------------------------------
61 // Bitmap data
62 // ----------------------------------------------------------------------------
63
64 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
65 {
66 public:
67 wxBitmapRefData();
68 virtual ~wxBitmapRefData() { Free(); }
69
70 virtual void Free();
71
72 // set the mask object to use as the mask, we take ownership of it
73 void SetMask(wxMask *mask)
74 {
75 delete m_bitmapMask;
76 m_bitmapMask = mask;
77 }
78
79 // set the HBITMAP to use as the mask
80 void SetMask(HBITMAP hbmpMask)
81 {
82 SetMask(new wxMask((WXHBITMAP)hbmpMask));
83 }
84
85 // return the mask
86 wxMask *GetMask() const { return m_bitmapMask; }
87
88 public:
89 #if wxUSE_PALETTE
90 wxPalette m_bitmapPalette;
91 #endif // wxUSE_PALETTE
92
93 // MSW-specific
94 // ------------
95
96 #ifdef __WXDEBUG__
97 // this field is solely for error checking: we detect selecting a bitmap
98 // into more than one DC at once or deleting a bitmap still selected into a
99 // DC (both are serious programming errors under Windows)
100 wxDC *m_selectedInto;
101 #endif // __WXDEBUG__
102
103 // true if we have alpha transparency info and can be drawn using
104 // AlphaBlend()
105 bool m_hasAlpha;
106
107 private:
108 // optional mask for transparent drawing
109 wxMask *m_bitmapMask;
110
111 DECLARE_NO_COPY_CLASS(wxBitmapRefData)
112 };
113
114 // ----------------------------------------------------------------------------
115 // macros
116 // ----------------------------------------------------------------------------
117
118 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
119 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
120
121 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
122
123 // ============================================================================
124 // implementation
125 // ============================================================================
126
127 // ----------------------------------------------------------------------------
128 // helper functions
129 // ----------------------------------------------------------------------------
130
131 // decide whether we should create a DIB or a DDB for the given parameters
132 static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
133 {
134 // here is the logic:
135 //
136 // (a) if hdc is specified, the caller explicitly wants DDB
137 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
138 // less DIBs anyhow)
139 // (c) finally, create DIBs under Win9x even if the depth hasn't been
140 // explicitly specified but the current display depth is 24 or more
141 // and the image is "big", i.e. > 16Mb which is the theoretical limit
142 // for DDBs under Win9x
143 //
144 // consequences (all of which seem to make sense):
145 //
146 // (i) by default, DDBs are created (depth == -1 usually)
147 // (ii) DIBs can be created by explicitly specifying the depth
148 // (iii) using a DC always forces creating a DDB
149 return !hdc &&
150 (d >= 24 ||
151 (d == -1 &&
152 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
153 }
154
155 // ----------------------------------------------------------------------------
156 // wxBitmapRefData
157 // ----------------------------------------------------------------------------
158
159 wxBitmapRefData::wxBitmapRefData()
160 {
161 #ifdef __WXDEBUG__
162 m_selectedInto = NULL;
163 #endif
164 m_bitmapMask = NULL;
165 m_hBitmap = (WXHBITMAP) NULL;
166 m_hasAlpha = FALSE;
167 }
168
169 void wxBitmapRefData::Free()
170 {
171 wxASSERT_MSG( !m_selectedInto,
172 wxT("deleting bitmap still selected into wxMemoryDC") );
173
174 if ( m_hBitmap)
175 {
176 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
177 {
178 wxLogLastError(wxT("DeleteObject(hbitmap)"));
179 }
180 }
181
182 delete m_bitmapMask;
183 m_bitmapMask = NULL;
184 }
185
186 // ----------------------------------------------------------------------------
187 // wxBitmap creation
188 // ----------------------------------------------------------------------------
189
190 // this function should be called from all wxBitmap ctors
191 void wxBitmap::Init()
192 {
193 // m_refData = NULL; done in the base class ctor
194 }
195
196 wxGDIImageRefData *wxBitmap::CreateData() const
197 {
198 return new wxBitmapRefData;
199 }
200
201 #ifdef __WIN32__
202
203 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
204 {
205 #ifndef __WXMICROWIN__
206 // it may be either HICON or HCURSOR
207 HICON hicon = (HICON)icon.GetHandle();
208
209 ICONINFO iconInfo;
210 if ( !::GetIconInfo(hicon, &iconInfo) )
211 {
212 wxLogLastError(wxT("GetIconInfo"));
213
214 return FALSE;
215 }
216
217 wxBitmapRefData *refData = new wxBitmapRefData;
218 m_refData = refData;
219
220 int w = icon.GetWidth(),
221 h = icon.GetHeight();
222
223 refData->m_width = w;
224 refData->m_height = h;
225 refData->m_depth = wxDisplayDepth();
226
227 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
228
229 // the mask returned by GetIconInfo() is inversed compared to the usual
230 // wxWin convention
231 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
232
233
234 // delete the old one now as we don't need it any more
235 ::DeleteObject(iconInfo.hbmMask);
236
237 #if WXWIN_COMPATIBILITY_2
238 refData->m_ok = TRUE;
239 #endif // WXWIN_COMPATIBILITY_2
240
241 return TRUE;
242 #else
243 return FALSE;
244 #endif
245 }
246
247 #endif // Win32
248
249 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
250 {
251 UnRef();
252
253 if ( !cursor.Ok() )
254 return FALSE;
255
256 #ifdef __WIN16__
257 wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
258
259 return FALSE;
260 #else
261 return CopyFromIconOrCursor(cursor);
262 #endif // Win16
263 }
264
265 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
266 {
267 UnRef();
268
269 if ( !icon.Ok() )
270 return FALSE;
271
272 // GetIconInfo() doesn't exist under Win16 and I don't know any other way
273 // to create a bitmap from icon there - but using this way we won't have
274 // the mask (FIXME)
275 #ifdef __WIN16__
276 int width = icon.GetWidth(),
277 height = icon.GetHeight();
278
279 // copy the icon to the bitmap
280 ScreenHDC hdcScreen;
281 HDC hdc = ::CreateCompatibleDC(hdcScreen);
282 HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
283 HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
284
285 ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
286
287 ::SelectObject(hdc, hbmpOld);
288 ::DeleteDC(hdc);
289
290 wxBitmapRefData *refData = new wxBitmapRefData;
291 m_refData = refData;
292
293 refData->m_width = width;
294 refData->m_height = height;
295 refData->m_depth = wxDisplayDepth();
296
297 refData->m_hBitmap = (WXHBITMAP)hbitmap;
298
299 #if WXWIN_COMPATIBILITY_2
300 refData->m_ok = TRUE;
301 #endif // WXWIN_COMPATIBILITY_2
302
303 return TRUE;
304 #else // Win32
305 return CopyFromIconOrCursor(icon);
306 #endif // Win16/Win32
307 }
308
309 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
310 {
311 wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
312
313 HBITMAP hbitmap = dib.CreateDDB();
314 if ( !hbitmap )
315 return FALSE;
316
317 UnRef();
318
319 wxBitmapRefData *refData = new wxBitmapRefData;
320 m_refData = refData;
321
322 refData->m_width = dib.GetWidth();
323 refData->m_height = dib.GetHeight();
324 refData->m_depth = dib.GetDepth();
325
326 refData->m_hBitmap = (WXHBITMAP)hbitmap;
327
328 #if wxUSE_PALETTE
329 wxPalette *palette = dib.CreatePalette();
330 if ( palette )
331 {
332 refData->m_bitmapPalette = *palette;
333 }
334
335 delete palette;
336 #endif // wxUSE_PALETTE
337
338 return TRUE;
339 }
340
341 wxBitmap::~wxBitmap()
342 {
343 }
344
345 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
346 {
347 Init();
348
349 #ifndef __WXMICROWIN__
350 wxBitmapRefData *refData = new wxBitmapRefData;
351 m_refData = refData;
352
353 refData->m_width = width;
354 refData->m_height = height;
355 refData->m_depth = depth;
356
357 char *data;
358 if ( depth == 1 )
359 {
360 // we assume that it is in XBM format which is not quite the same as
361 // the format CreateBitmap() wants because the order of bytes in the
362 // line is inversed!
363 const size_t bytesPerLine = (width + 7) / 8;
364 const size_t padding = bytesPerLine % 2;
365 const size_t len = height * ( padding + bytesPerLine );
366 data = (char *)malloc(len);
367 const char *src = bits;
368 char *dst = data;
369
370 for ( int rows = 0; rows < height; rows++ )
371 {
372 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
373 {
374 unsigned char val = *src++;
375 unsigned char reversed = 0;
376
377 for ( int bits = 0; bits < 8; bits++)
378 {
379 reversed <<= 1;
380 reversed |= (val & 0x01);
381 val >>= 1;
382 }
383 *dst++ = reversed;
384 }
385
386 if ( padding )
387 *dst++ = 0;
388 }
389 }
390 else
391 {
392 // bits should already be in Windows standard format
393 data = (char *)bits; // const_cast is harmless
394 }
395
396 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
397 if ( !hbmp )
398 {
399 wxLogLastError(wxT("CreateBitmap"));
400 }
401
402 if ( data != bits )
403 {
404 free(data);
405 }
406
407 SetHBITMAP((WXHBITMAP)hbmp);
408 #endif
409 }
410
411 // Create from XPM data
412 bool wxBitmap::CreateFromXpm(const char **data)
413 {
414 #if wxUSE_IMAGE && wxUSE_XPM
415 Init();
416
417 wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
418
419 wxXPMDecoder decoder;
420 wxImage img = decoder.ReadData(data);
421 wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
422
423 *this = wxBitmap(img);
424 return TRUE;
425 #else
426 return FALSE;
427 #endif
428 }
429
430 wxBitmap::wxBitmap(int w, int h, int d)
431 {
432 Init();
433
434 (void)Create(w, h, d);
435 }
436
437 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
438 {
439 Init();
440
441 (void)Create(data, type, width, height, depth);
442 }
443
444 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
445 {
446 Init();
447
448 LoadFile(filename, (int)type);
449 }
450
451 bool wxBitmap::Create(int width, int height, int depth)
452 {
453 return DoCreate(width, height, depth, 0);
454 }
455
456 bool wxBitmap::Create(int width, int height, const wxDC& dc)
457 {
458 wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
459
460 return DoCreate(width, height, -1, dc.GetHDC());
461 }
462
463 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
464 {
465 UnRef();
466
467 m_refData = new wxBitmapRefData;
468
469 GetBitmapData()->m_width = w;
470 GetBitmapData()->m_height = h;
471
472 HBITMAP hbmp;
473
474 if ( wxShouldCreateDIB(w, h, d, hdc) )
475 {
476 if ( d == -1 )
477 {
478 // create DIBs without alpha channel by default
479 d = 24;
480 }
481
482 wxDIB dib(w, h, d);
483 if ( !dib.IsOk() )
484 return FALSE;
485
486 // don't delete the DIB section in dib object dtor
487 hbmp = dib.Detach();
488
489 GetBitmapData()->m_depth = d;
490 }
491 else // create a DDB
492 {
493 if ( d == -1 )
494 d = wxDisplayDepth();
495
496 GetBitmapData()->m_depth = d;
497
498 #ifndef __WXMICROWIN__
499 if ( d > 0 )
500 {
501 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
502 if ( !hbmp )
503 {
504 wxLogLastError(wxT("CreateBitmap"));
505 }
506 }
507 else
508 #endif // !__WXMICROWIN__
509 {
510 ScreenHDC dc;
511 hbmp = ::CreateCompatibleBitmap(dc, w, h);
512 if ( !hbmp )
513 {
514 wxLogLastError(wxT("CreateCompatibleBitmap"));
515 }
516
517 GetBitmapData()->m_depth = wxDisplayDepth();
518 }
519 }
520
521 SetHBITMAP((WXHBITMAP)hbmp);
522
523 #if WXWIN_COMPATIBILITY_2
524 GetBitmapData()->m_ok = hbmp != 0;
525 #endif // WXWIN_COMPATIBILITY_2
526
527 return Ok();
528 }
529
530 #if wxUSE_IMAGE
531
532 // ----------------------------------------------------------------------------
533 // wxImage to/from conversions for Microwin
534 // ----------------------------------------------------------------------------
535
536 // Microwin versions are so different from normal ones that it really doesn't
537 // make sense to use #ifdefs inside the function bodies
538 #ifdef __WXMICROWIN__
539
540 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
541 {
542 // Set this to 1 to experiment with mask code,
543 // which currently doesn't work
544 #define USE_MASKS 0
545
546 m_refData = new wxBitmapRefData();
547
548 // Initial attempt at a simple-minded implementation.
549 // The bitmap will always be created at the screen depth,
550 // so the 'depth' argument is ignored.
551
552 HDC hScreenDC = ::GetDC(NULL);
553 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
554
555 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
556 HBITMAP hMaskBitmap = NULL;
557 HBITMAP hOldMaskBitmap = NULL;
558 HDC hMaskDC = NULL;
559 unsigned char maskR = 0;
560 unsigned char maskG = 0;
561 unsigned char maskB = 0;
562
563 // printf("Created bitmap %d\n", (int) hBitmap);
564 if (hBitmap == NULL)
565 {
566 ::ReleaseDC(NULL, hScreenDC);
567 return FALSE;
568 }
569 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
570
571 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
572 ::ReleaseDC(NULL, hScreenDC);
573
574 // created an mono-bitmap for the possible mask
575 bool hasMask = image.HasMask();
576
577 if ( hasMask )
578 {
579 #if USE_MASKS
580 // FIXME: we should be able to pass bpp = 1, but
581 // GdBlit can't handle a different depth
582 #if 0
583 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
584 #else
585 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
586 #endif
587 maskR = image.GetMaskRed();
588 maskG = image.GetMaskGreen();
589 maskB = image.GetMaskBlue();
590
591 if (!hMaskBitmap)
592 {
593 hasMask = FALSE;
594 }
595 else
596 {
597 hScreenDC = ::GetDC(NULL);
598 hMaskDC = ::CreateCompatibleDC(hScreenDC);
599 ::ReleaseDC(NULL, hScreenDC);
600
601 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
602 }
603 #else
604 hasMask = FALSE;
605 #endif
606 }
607
608 int i, j;
609 for (i = 0; i < image.GetWidth(); i++)
610 {
611 for (j = 0; j < image.GetHeight(); j++)
612 {
613 unsigned char red = image.GetRed(i, j);
614 unsigned char green = image.GetGreen(i, j);
615 unsigned char blue = image.GetBlue(i, j);
616
617 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
618
619 if (hasMask)
620 {
621 // scan the bitmap for the transparent colour and set the corresponding
622 // pixels in the mask to BLACK and the rest to WHITE
623 if (maskR == red && maskG == green && maskB == blue)
624 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
625 else
626 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
627 }
628 }
629 }
630
631 ::SelectObject(hMemDC, hOldBitmap);
632 ::DeleteDC(hMemDC);
633 if (hasMask)
634 {
635 ::SelectObject(hMaskDC, hOldMaskBitmap);
636 ::DeleteDC(hMaskDC);
637
638 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
639 }
640
641 SetWidth(image.GetWidth());
642 SetHeight(image.GetHeight());
643 SetDepth(screenDepth);
644 SetHBITMAP( (WXHBITMAP) hBitmap );
645
646 #if wxUSE_PALETTE
647 // Copy the palette from the source image
648 SetPalette(image.GetPalette());
649 #endif // wxUSE_PALETTE
650
651 #if WXWIN_COMPATIBILITY_2
652 // check the wxBitmap object
653 GetBitmapData()->SetOk();
654 #endif // WXWIN_COMPATIBILITY_2
655
656 return TRUE;
657 }
658
659 wxImage wxBitmap::ConvertToImage() const
660 {
661 // Initial attempt at a simple-minded implementation.
662 // The bitmap will always be created at the screen depth,
663 // so the 'depth' argument is ignored.
664 // TODO: transparency (create a mask image)
665
666 if (!Ok())
667 {
668 wxFAIL_MSG( wxT("bitmap is invalid") );
669 return wxNullImage;
670 }
671
672 wxImage image;
673
674 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
675
676 // create an wxImage object
677 int width = GetWidth();
678 int height = GetHeight();
679 image.Create( width, height );
680 unsigned char *data = image.GetData();
681 if( !data )
682 {
683 wxFAIL_MSG( wxT("could not allocate data for image") );
684 return wxNullImage;
685 }
686
687 HDC hScreenDC = ::GetDC(NULL);
688
689 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
690 ::ReleaseDC(NULL, hScreenDC);
691
692 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
693
694 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
695
696 int i, j;
697 for (i = 0; i < GetWidth(); i++)
698 {
699 for (j = 0; j < GetHeight(); j++)
700 {
701 COLORREF color = ::GetPixel(hMemDC, i, j);
702 unsigned char red = GetRValue(color);
703 unsigned char green = GetGValue(color);
704 unsigned char blue = GetBValue(color);
705
706 image.SetRGB(i, j, red, green, blue);
707 }
708 }
709
710 ::SelectObject(hMemDC, hOldBitmap);
711 ::DeleteDC(hMemDC);
712
713 #if wxUSE_PALETTE
714 // Copy the palette from the source image
715 if (GetPalette())
716 image.SetPalette(* GetPalette());
717 #endif // wxUSE_PALETTE
718
719 return image;
720 }
721
722 #endif // __WXMICROWIN__
723
724 // ----------------------------------------------------------------------------
725 // wxImage to/from conversions
726 // ----------------------------------------------------------------------------
727
728 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
729 {
730 return CreateFromImage(image, depth, 0);
731 }
732
733 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
734 {
735 wxCHECK_MSG( dc.Ok(), FALSE,
736 _T("invalid HDC in wxBitmap::CreateFromImage()") );
737
738 return CreateFromImage(image, -1, dc.GetHDC());
739 }
740
741 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
742 {
743 wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
744
745 UnRef();
746
747 // first convert the image to DIB
748 const int h = image.GetHeight();
749 const int w = image.GetWidth();
750
751 wxDIB dib(image);
752 if ( !dib.IsOk() )
753 return FALSE;
754
755
756 // store the bitmap parameters
757 wxBitmapRefData *refData = new wxBitmapRefData;
758 refData->m_width = w;
759 refData->m_height = h;
760 refData->m_hasAlpha = image.HasAlpha();
761
762 m_refData = refData;
763
764
765 // next either store DIB as is or create a DDB from it
766 HBITMAP hbitmap;
767
768 // are we going to use DIB?
769 if ( wxShouldCreateDIB(w, h, depth, hdc) )
770 {
771 // don't delete the DIB section in dib object dtor
772 hbitmap = dib.Detach();
773
774 refData->m_depth = dib.GetDepth();
775 }
776 else // we need to convert DIB to DDB
777 {
778 hbitmap = dib.CreateDDB((HDC)hdc);
779
780 refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
781 }
782
783 // validate this object
784 SetHBITMAP((WXHBITMAP)hbitmap);
785
786 #if WXWIN_COMPATIBILITY_2
787 m_refData->m_ok = TRUE;
788 #endif // WXWIN_COMPATIBILITY_2
789
790 // finally also set the mask if we have one
791 if ( image.HasMask() )
792 {
793 SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
794 image.GetMaskGreen(),
795 image.GetMaskBlue())));
796 }
797
798 return TRUE;
799 }
800
801 wxImage wxBitmap::ConvertToImage() const
802 {
803 wxImage image;
804
805 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
806
807 // create an wxImage object
808 int width = GetWidth();
809 int height = GetHeight();
810 image.Create( width, height );
811 unsigned char *data = image.GetData();
812 if( !data )
813 {
814 wxFAIL_MSG( wxT("could not allocate data for image") );
815 return wxNullImage;
816 }
817
818 // calc the number of bytes per scanline and padding in the DIB
819 int bytePerLine = width*3;
820 int sizeDWORD = sizeof( DWORD );
821 int lineBoundary = bytePerLine % sizeDWORD;
822 int padding = 0;
823 if( lineBoundary > 0 )
824 {
825 padding = sizeDWORD - lineBoundary;
826 bytePerLine += padding;
827 }
828
829 // create a DIB header
830 int headersize = sizeof(BITMAPINFOHEADER);
831 BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
832 if( !lpDIBh )
833 {
834 wxFAIL_MSG( wxT("could not allocate data for DIB header") );
835 free( data );
836 return wxNullImage;
837 }
838 // Fill in the DIB header
839 lpDIBh->bmiHeader.biSize = headersize;
840 lpDIBh->bmiHeader.biWidth = width;
841 lpDIBh->bmiHeader.biHeight = -height;
842 lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
843 lpDIBh->bmiHeader.biPlanes = 1;
844 lpDIBh->bmiHeader.biBitCount = 24;
845 lpDIBh->bmiHeader.biCompression = BI_RGB;
846 lpDIBh->bmiHeader.biClrUsed = 0;
847 // These seem not really needed for our purpose here.
848 lpDIBh->bmiHeader.biClrImportant = 0;
849 lpDIBh->bmiHeader.biXPelsPerMeter = 0;
850 lpDIBh->bmiHeader.biYPelsPerMeter = 0;
851 // memory for DIB data
852 unsigned char *lpBits;
853 lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
854 if( !lpBits )
855 {
856 wxFAIL_MSG( wxT("could not allocate data for DIB") );
857 free( data );
858 free( lpDIBh );
859 return wxNullImage;
860 }
861
862 // copy data from the device-dependent bitmap to the DIB
863 HDC hdc = ::GetDC(NULL);
864 HBITMAP hbitmap;
865 hbitmap = (HBITMAP) GetHBITMAP();
866 ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
867
868 // copy DIB data into the wxImage object
869 int i, j;
870 unsigned char *ptdata = data;
871 unsigned char *ptbits = lpBits;
872 for( i=0; i<height; i++ )
873 {
874 for( j=0; j<width; j++ )
875 {
876 *(ptdata++) = *(ptbits+2);
877 *(ptdata++) = *(ptbits+1);
878 *(ptdata++) = *(ptbits );
879 ptbits += 3;
880 }
881 ptbits += padding;
882 }
883
884 // similarly, set data according to the possible mask bitmap
885 if( GetMask() && GetMask()->GetMaskBitmap() )
886 {
887 hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
888 // memory DC created, color set, data copied, and memory DC deleted
889 HDC memdc = ::CreateCompatibleDC( hdc );
890 ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
891 ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
892 ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
893 ::DeleteDC( memdc );
894 // background color set to RGB(16,16,16) in consistent with wxGTK
895 unsigned char r=16, g=16, b=16;
896 ptdata = data;
897 ptbits = lpBits;
898 for( i=0; i<height; i++ )
899 {
900 for( j=0; j<width; j++ )
901 {
902 if( *ptbits != 0 )
903 ptdata += 3;
904 else
905 {
906 *(ptdata++) = r;
907 *(ptdata++) = g;
908 *(ptdata++) = b;
909 }
910 ptbits += 3;
911 }
912 ptbits += padding;
913 }
914 image.SetMaskColour( r, g, b );
915 image.SetMask( TRUE );
916 }
917 else
918 {
919 image.SetMask( FALSE );
920 }
921 // free allocated resources
922 ::ReleaseDC(NULL, hdc);
923 free(lpDIBh);
924 free(lpBits);
925
926 return image;
927 }
928
929 #endif // wxUSE_IMAGE
930
931 // ----------------------------------------------------------------------------
932 // loading and saving bitmaps
933 // ----------------------------------------------------------------------------
934
935 bool wxBitmap::LoadFile(const wxString& filename, long type)
936 {
937 UnRef();
938
939 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
940
941 if ( handler )
942 {
943 m_refData = new wxBitmapRefData;
944
945 return handler->LoadFile(this, filename, type, -1, -1);
946 }
947 #if wxUSE_IMAGE
948 else
949 {
950 wxImage image;
951 if ( image.LoadFile( filename, type ) && image.Ok() )
952 {
953 *this = wxBitmap(image);
954
955 return TRUE;
956 }
957 }
958 #endif // wxUSE_IMAGE
959
960 return FALSE;
961 }
962
963 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
964 {
965 UnRef();
966
967 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
968
969 if ( !handler )
970 {
971 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
972
973 return FALSE;
974 }
975
976 m_refData = new wxBitmapRefData;
977
978 return handler->Create(this, data, type, width, height, depth);
979 }
980
981 bool wxBitmap::SaveFile(const wxString& filename,
982 int type,
983 const wxPalette *palette)
984 {
985 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
986
987 if ( handler )
988 {
989 return handler->SaveFile(this, filename, type, palette);
990 }
991 #if wxUSE_IMAGE
992 else
993 {
994 // FIXME what about palette? shouldn't we use it?
995 wxImage image = ConvertToImage();
996 if ( image.Ok() )
997 {
998 return image.SaveFile(filename, type);
999 }
1000 }
1001 #endif // wxUSE_IMAGE
1002
1003 return FALSE;
1004 }
1005
1006 // ----------------------------------------------------------------------------
1007 // sub bitmap extraction
1008 // ----------------------------------------------------------------------------
1009
1010 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1011 {
1012 wxCHECK_MSG( Ok() &&
1013 (rect.x >= 0) && (rect.y >= 0) &&
1014 (rect.x+rect.width <= GetWidth()) &&
1015 (rect.y+rect.height <= GetHeight()),
1016 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1017
1018 wxBitmap ret( rect.width, rect.height );
1019 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1020
1021 #ifndef __WXMICROWIN__
1022 // TODO: copy alpha channel data if any
1023
1024 // copy bitmap data
1025 MemoryHDC dcSrc,
1026 dcDst;
1027
1028 {
1029 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1030 selectDst(dcDst, GetHbitmapOf(ret));
1031
1032 if ( !selectSrc || !selectDst )
1033 {
1034 wxLogLastError(_T("SelectObjct(hBitmap)"));
1035 }
1036
1037 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1038 dcSrc, rect.x, rect.y, SRCCOPY) )
1039 {
1040 wxLogLastError(_T("BitBlt"));
1041 }
1042 }
1043
1044 // copy mask if there is one
1045 if ( GetMask() )
1046 {
1047 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1048
1049 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1050 selectDst(dcDst, hbmpMask);
1051
1052 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1053 dcSrc, rect.x, rect.y, SRCCOPY) )
1054 {
1055 wxLogLastError(_T("BitBlt"));
1056 }
1057
1058 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1059 ret.SetMask(mask);
1060 }
1061 #endif // !__WXMICROWIN__
1062
1063 return ret;
1064 }
1065
1066 // ----------------------------------------------------------------------------
1067 // wxBitmap accessors
1068 // ----------------------------------------------------------------------------
1069
1070 wxPalette* wxBitmap::GetPalette() const
1071 {
1072 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1073 : (wxPalette *) NULL;
1074 }
1075
1076 wxMask *wxBitmap::GetMask() const
1077 {
1078 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1079 }
1080
1081 #ifdef __WXDEBUG__
1082
1083 wxDC *wxBitmap::GetSelectedInto() const
1084 {
1085 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1086 }
1087
1088 #endif
1089
1090 #if WXWIN_COMPATIBILITY_2_4
1091
1092 int wxBitmap::GetQuality() const
1093 {
1094 return 0;
1095 }
1096
1097 #endif // WXWIN_COMPATIBILITY_2_4
1098
1099 void wxBitmap::UseAlpha()
1100 {
1101 if ( GetBitmapData() )
1102 GetBitmapData()->m_hasAlpha = true;
1103 }
1104
1105 bool wxBitmap::HasAlpha() const
1106 {
1107 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1108 }
1109
1110 // ----------------------------------------------------------------------------
1111 // wxBitmap setters
1112 // ----------------------------------------------------------------------------
1113
1114 #ifdef __WXDEBUG__
1115
1116 void wxBitmap::SetSelectedInto(wxDC *dc)
1117 {
1118 if ( GetBitmapData() )
1119 GetBitmapData()->m_selectedInto = dc;
1120 }
1121
1122 #endif
1123
1124 #if wxUSE_PALETTE
1125
1126 void wxBitmap::SetPalette(const wxPalette& palette)
1127 {
1128 EnsureHasData();
1129
1130 GetBitmapData()->m_bitmapPalette = palette;
1131 }
1132
1133 #endif // wxUSE_PALETTE
1134
1135 void wxBitmap::SetMask(wxMask *mask)
1136 {
1137 EnsureHasData();
1138
1139 GetBitmapData()->SetMask(mask);
1140 }
1141
1142 #if WXWIN_COMPATIBILITY_2
1143
1144 void wxBitmap::SetOk(bool isOk)
1145 {
1146 EnsureHasData();
1147
1148 GetBitmapData()->m_ok = isOk;
1149 }
1150
1151 #endif // WXWIN_COMPATIBILITY_2
1152
1153 #if WXWIN_COMPATIBILITY_2_4
1154
1155 void wxBitmap::SetQuality(int WXUNUSED(quality))
1156 {
1157 }
1158
1159 #endif // WXWIN_COMPATIBILITY_2_4
1160
1161 // ----------------------------------------------------------------------------
1162 // raw bitmap access support
1163 // ----------------------------------------------------------------------------
1164
1165 bool wxBitmap::GetRawData(wxRawBitmapData *data)
1166 {
1167 wxCHECK_MSG( data, FALSE, _T("NULL pointer in wxBitmap::GetRawData") );
1168
1169 if ( !Ok() )
1170 {
1171 // no bitmap, no data (raw or otherwise)
1172 return FALSE;
1173 }
1174
1175 // we only support raw access to the DIBs, so check if we have one
1176 DIBSECTION ds;
1177 if ( !::GetObject(GetHbitmap(), sizeof(ds), &ds) )
1178 {
1179 return FALSE;
1180 }
1181
1182 // ok, store the relevant info in wxRawBitmapData
1183 const LONG h = ds.dsBm.bmHeight;
1184
1185 data->m_width = ds.dsBm.bmWidth;
1186 data->m_height = h;
1187 data->m_bypp = ds.dsBm.bmBitsPixel / 8;
1188
1189 // remember that DIBs are stored in top to bottom order!
1190 const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1191 data->m_stride = -bytesPerRow;
1192 data->m_pixels = (unsigned char *)ds.dsBm.bmBits;
1193 if ( h > 1 )
1194 {
1195 data->m_pixels += (h - 1)*bytesPerRow;
1196 }
1197
1198 return TRUE;
1199 }
1200
1201 void wxBitmap::UngetRawData(wxRawBitmapData *data)
1202 {
1203 wxCHECK_RET( data, _T("NULL pointer in wxBitmap::UngetRawData()") );
1204
1205 // AlphaBlend() wants to have premultiplied source alpha but wxRawBitmap
1206 // API uses normal, not premultiplied, colours, so adjust them here now
1207 wxRawBitmapIterator p(*data);
1208
1209 const int w = data->GetWidth();
1210 const int h = data->GetHeight();
1211
1212 for ( int y = 0; y < h; y++ )
1213 {
1214 wxRawBitmapIterator rowStart = p;
1215
1216 for ( int x = 0; x < w; x++ )
1217 {
1218 const unsigned alpha = p.Alpha();
1219
1220 p.Red() = (p.Red() * alpha) / 255;
1221 p.Blue() = (p.Blue() * alpha) / 255;
1222 p.Green() = (p.Green() * alpha) / 255;
1223
1224 ++p;
1225 }
1226
1227 p = rowStart;
1228 p.OffsetY(1);
1229 }
1230 }
1231
1232 // ----------------------------------------------------------------------------
1233 // wxMask
1234 // ----------------------------------------------------------------------------
1235
1236 wxMask::wxMask()
1237 {
1238 m_maskBitmap = 0;
1239 }
1240
1241 // Construct a mask from a bitmap and a colour indicating
1242 // the transparent area
1243 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1244 {
1245 m_maskBitmap = 0;
1246 Create(bitmap, colour);
1247 }
1248
1249 // Construct a mask from a bitmap and a palette index indicating
1250 // the transparent area
1251 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1252 {
1253 m_maskBitmap = 0;
1254 Create(bitmap, paletteIndex);
1255 }
1256
1257 // Construct a mask from a mono bitmap (copies the bitmap).
1258 wxMask::wxMask(const wxBitmap& bitmap)
1259 {
1260 m_maskBitmap = 0;
1261 Create(bitmap);
1262 }
1263
1264 wxMask::~wxMask()
1265 {
1266 if ( m_maskBitmap )
1267 ::DeleteObject((HBITMAP) m_maskBitmap);
1268 }
1269
1270 // Create a mask from a mono bitmap (copies the bitmap).
1271 bool wxMask::Create(const wxBitmap& bitmap)
1272 {
1273 #ifndef __WXMICROWIN__
1274 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1275 _T("can't create mask from invalid or not monochrome bitmap") );
1276
1277 if ( m_maskBitmap )
1278 {
1279 ::DeleteObject((HBITMAP) m_maskBitmap);
1280 m_maskBitmap = 0;
1281 }
1282
1283 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1284 bitmap.GetWidth(),
1285 bitmap.GetHeight(),
1286 1, 1, 0
1287 );
1288 HDC srcDC = CreateCompatibleDC(0);
1289 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1290 HDC destDC = CreateCompatibleDC(0);
1291 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1292 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1293 SelectObject(srcDC, 0);
1294 DeleteDC(srcDC);
1295 SelectObject(destDC, 0);
1296 DeleteDC(destDC);
1297 return TRUE;
1298 #else
1299 return FALSE;
1300 #endif
1301 }
1302
1303 // Create a mask from a bitmap and a palette index indicating
1304 // the transparent area
1305 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1306 {
1307 if ( m_maskBitmap )
1308 {
1309 ::DeleteObject((HBITMAP) m_maskBitmap);
1310 m_maskBitmap = 0;
1311 }
1312
1313 #if wxUSE_PALETTE
1314 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1315 {
1316 unsigned char red, green, blue;
1317 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1318 {
1319 wxColour transparentColour(red, green, blue);
1320 return Create(bitmap, transparentColour);
1321 }
1322 }
1323 #endif // wxUSE_PALETTE
1324
1325 return FALSE;
1326 }
1327
1328 // Create a mask from a bitmap and a colour indicating
1329 // the transparent area
1330 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1331 {
1332 #ifndef __WXMICROWIN__
1333 wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1334
1335 if ( m_maskBitmap )
1336 {
1337 ::DeleteObject((HBITMAP) m_maskBitmap);
1338 m_maskBitmap = 0;
1339 }
1340
1341 int width = bitmap.GetWidth(),
1342 height = bitmap.GetHeight();
1343
1344 // scan the bitmap for the transparent colour and set the corresponding
1345 // pixels in the mask to BLACK and the rest to WHITE
1346 COLORREF maskColour = wxColourToPalRGB(colour);
1347 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1348
1349 HDC srcDC = ::CreateCompatibleDC(NULL);
1350 HDC destDC = ::CreateCompatibleDC(NULL);
1351 if ( !srcDC || !destDC )
1352 {
1353 wxLogLastError(wxT("CreateCompatibleDC"));
1354 }
1355
1356 bool ok = TRUE;
1357
1358 // SelectObject() will fail
1359 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1360 _T("bitmap can't be selected in another DC") );
1361
1362 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1363 if ( !hbmpSrcOld )
1364 {
1365 wxLogLastError(wxT("SelectObject"));
1366
1367 ok = FALSE;
1368 }
1369
1370 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1371 if ( !hbmpDstOld )
1372 {
1373 wxLogLastError(wxT("SelectObject"));
1374
1375 ok = FALSE;
1376 }
1377
1378 if ( ok )
1379 {
1380 // this will create a monochrome bitmap with 0 points for the pixels
1381 // which have the same value as the background colour and 1 for the
1382 // others
1383 ::SetBkColor(srcDC, maskColour);
1384 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1385 }
1386
1387 ::SelectObject(srcDC, hbmpSrcOld);
1388 ::DeleteDC(srcDC);
1389 ::SelectObject(destDC, hbmpDstOld);
1390 ::DeleteDC(destDC);
1391
1392 return ok;
1393 #else // __WXMICROWIN__
1394 return FALSE;
1395 #endif // __WXMICROWIN__/!__WXMICROWIN__
1396 }
1397
1398 // ----------------------------------------------------------------------------
1399 // wxBitmapHandler
1400 // ----------------------------------------------------------------------------
1401
1402 bool wxBitmapHandler::Create(wxGDIImage *image,
1403 void *data,
1404 long flags,
1405 int width, int height, int depth)
1406 {
1407 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1408
1409 return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1410 }
1411
1412 bool wxBitmapHandler::Load(wxGDIImage *image,
1413 const wxString& name,
1414 long flags,
1415 int width, int height)
1416 {
1417 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1418
1419 return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1420 }
1421
1422 bool wxBitmapHandler::Save(wxGDIImage *image,
1423 const wxString& name,
1424 int type)
1425 {
1426 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1427
1428 return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1429 }
1430
1431 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1432 void *WXUNUSED(data),
1433 long WXUNUSED(type),
1434 int WXUNUSED(width),
1435 int WXUNUSED(height),
1436 int WXUNUSED(depth))
1437 {
1438 return FALSE;
1439 }
1440
1441 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1442 const wxString& WXUNUSED(name),
1443 long WXUNUSED(type),
1444 int WXUNUSED(desiredWidth),
1445 int WXUNUSED(desiredHeight))
1446 {
1447 return FALSE;
1448 }
1449
1450 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1451 const wxString& WXUNUSED(name),
1452 int WXUNUSED(type),
1453 const wxPalette *WXUNUSED(palette))
1454 {
1455 return FALSE;
1456 }
1457
1458 // ----------------------------------------------------------------------------
1459 // DIB functions
1460 // ----------------------------------------------------------------------------
1461
1462 #ifndef __WXMICROWIN__
1463 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1464 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1465 {
1466 unsigned long i, headerSize;
1467 LPBITMAPINFO lpDIBheader = NULL;
1468 LPPALETTEENTRY lpPe = NULL;
1469
1470
1471 // Allocate space for a DIB header
1472 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1473 lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1474 lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1475
1476 GetPaletteEntries(hPal, 0, 256, lpPe);
1477
1478 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1479
1480 // Fill in the static parts of the DIB header
1481 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1482 lpDIBheader->bmiHeader.biWidth = xSize;
1483 lpDIBheader->bmiHeader.biHeight = ySize;
1484 lpDIBheader->bmiHeader.biPlanes = 1;
1485
1486 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1487 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1488 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1489 lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1490 lpDIBheader->bmiHeader.biClrUsed = 256;
1491
1492
1493 // Initialize the DIB palette
1494 for (i = 0; i < 256; i++) {
1495 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1496 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1497 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1498 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1499 }
1500
1501 *lpDIBHeader = lpDIBheader;
1502
1503 return TRUE;
1504 }
1505
1506 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1507 {
1508 free(lpDIBHeader);
1509 }
1510 #endif
1511
1512 // ----------------------------------------------------------------------------
1513 // global helper functions implemented here
1514 // ----------------------------------------------------------------------------
1515
1516 // helper of wxBitmapToHICON/HCURSOR
1517 static
1518 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1519 bool iconWanted,
1520 int hotSpotX,
1521 int hotSpotY)
1522 {
1523 if ( !bmp.Ok() )
1524 {
1525 // we can't create an icon/cursor form nothing
1526 return 0;
1527 }
1528
1529 wxMask *mask = bmp.GetMask();
1530 if ( !mask )
1531 {
1532 // we must have a mask for an icon, so even if it's probably incorrect,
1533 // do create it (grey is the "standard" transparent colour)
1534 mask = new wxMask(bmp, *wxLIGHT_GREY);
1535 }
1536
1537 ICONINFO iconInfo;
1538 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1539 if ( !iconWanted )
1540 {
1541 iconInfo.xHotspot = hotSpotX;
1542 iconInfo.yHotspot = hotSpotY;
1543 }
1544
1545 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1546 iconInfo.hbmColor = GetHbitmapOf(bmp);
1547
1548 // black out the transparent area to preserve background colour, because
1549 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1550 // the mask to the dest rect.
1551 {
1552 MemoryHDC dcSrc, dcDst;
1553 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1554 selectBitmap(dcDst, iconInfo.hbmColor);
1555
1556 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1557 dcSrc, 0, 0, SRCAND) )
1558 {
1559 wxLogLastError(_T("BitBlt"));
1560 }
1561 }
1562
1563 HICON hicon = ::CreateIconIndirect(&iconInfo);
1564
1565 if ( !bmp.GetMask() )
1566 {
1567 // we created the mask, now delete it
1568 delete mask;
1569 }
1570
1571 // delete the inverted mask bitmap we created as well
1572 ::DeleteObject(iconInfo.hbmMask);
1573
1574 return hicon;
1575 }
1576
1577 HICON wxBitmapToHICON(const wxBitmap& bmp)
1578 {
1579 return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1580 }
1581
1582 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1583 {
1584 return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1585 }
1586
1587 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1588 {
1589 #ifndef __WXMICROWIN__
1590 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1591
1592 // get width/height from the bitmap if not given
1593 if ( !w || !h )
1594 {
1595 BITMAP bm;
1596 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1597 w = bm.bmWidth;
1598 h = bm.bmHeight;
1599 }
1600
1601 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1602 HDC hdcDst = ::CreateCompatibleDC(NULL);
1603 if ( !hdcSrc || !hdcDst )
1604 {
1605 wxLogLastError(wxT("CreateCompatibleDC"));
1606 }
1607
1608 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1609 if ( !hbmpInvMask )
1610 {
1611 wxLogLastError(wxT("CreateBitmap"));
1612 }
1613
1614 ::SelectObject(hdcSrc, hbmpMask);
1615 ::SelectObject(hdcDst, hbmpInvMask);
1616 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1617 hdcSrc, 0, 0,
1618 NOTSRCCOPY) )
1619 {
1620 wxLogLastError(wxT("BitBlt"));
1621 }
1622
1623 ::DeleteDC(hdcSrc);
1624 ::DeleteDC(hdcDst);
1625
1626 return hbmpInvMask;
1627 #else
1628 return 0;
1629 #endif
1630 }
wxWidgets (Impactor)