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copy alpha presence flag when copying bitmaps using DIBs (#9883)
[wxWidgets.git] / src / msw / bitmap.cpp
1 ////////////////////////////////////////////////////////////////////////////
2 // Name: src/msw/bitmap.cpp
3 // Purpose: wxBitmap
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 04/01/98
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 // For compilers that support precompilation, includes "wx.h".
21 #include "wx/wxprec.h"
22
23 #ifdef __BORLANDC__
24 #pragma hdrstop
25 #endif
26
27 #include "wx/bitmap.h"
28
29 #ifndef WX_PRECOMP
30 #include <stdio.h>
31
32 #include "wx/list.h"
33 #include "wx/utils.h"
34 #include "wx/app.h"
35 #include "wx/palette.h"
36 #include "wx/dcmemory.h"
37 #include "wx/icon.h"
38 #include "wx/log.h"
39 #include "wx/image.h"
40 #endif
41
42 #include "wx/msw/private.h"
43 #include "wx/msw/dc.h"
44
45 #if wxUSE_WXDIB
46 #include "wx/msw/dib.h"
47 #endif
48
49 #ifdef wxHAS_RAW_BITMAP
50 #include "wx/rawbmp.h"
51 #endif
52
53 // missing from mingw32 header
54 #ifndef CLR_INVALID
55 #define CLR_INVALID ((COLORREF)-1)
56 #endif // no CLR_INVALID
57
58 // ----------------------------------------------------------------------------
59 // Bitmap data
60 // ----------------------------------------------------------------------------
61
62 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
63 {
64 public:
65 wxBitmapRefData();
66 wxBitmapRefData(const wxBitmapRefData& data);
67 virtual ~wxBitmapRefData() { Free(); }
68
69 virtual void Free();
70
71 // set the mask object to use as the mask, we take ownership of it
72 void SetMask(wxMask *mask)
73 {
74 delete m_bitmapMask;
75 m_bitmapMask = mask;
76 }
77
78 // set the HBITMAP to use as the mask
79 void SetMask(HBITMAP hbmpMask)
80 {
81 SetMask(new wxMask((WXHBITMAP)hbmpMask));
82 }
83
84 // return the mask
85 wxMask *GetMask() const { return m_bitmapMask; }
86
87 public:
88 #if wxUSE_PALETTE
89 wxPalette m_bitmapPalette;
90 #endif // wxUSE_PALETTE
91
92 // MSW-specific
93 // ------------
94
95 #ifdef __WXDEBUG__
96 // this field is solely for error checking: we detect selecting a bitmap
97 // into more than one DC at once or deleting a bitmap still selected into a
98 // DC (both are serious programming errors under Windows)
99 wxDC *m_selectedInto;
100 #endif // __WXDEBUG__
101
102 #if wxUSE_WXDIB
103 // when GetRawData() is called for a DDB we need to convert it to a DIB
104 // first to be able to provide direct access to it and we cache that DIB
105 // here and convert it back to DDB when UngetRawData() is called
106 wxDIB *m_dib;
107 #endif
108
109 // true if we have alpha transparency info and can be drawn using
110 // AlphaBlend()
111 bool m_hasAlpha;
112
113 // true if our HBITMAP is a DIB section, false if it is a DDB
114 bool m_isDIB;
115
116 private:
117 // optional mask for transparent drawing
118 wxMask *m_bitmapMask;
119
120
121 // not implemented
122 wxBitmapRefData& operator=(const wxBitmapRefData&);
123 };
124
125 // ----------------------------------------------------------------------------
126 // macros
127 // ----------------------------------------------------------------------------
128
129 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
130 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
131
132 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
133
134 // ============================================================================
135 // implementation
136 // ============================================================================
137
138 // ----------------------------------------------------------------------------
139 // helper functions
140 // ----------------------------------------------------------------------------
141
142 // decide whether we should create a DIB or a DDB for the given parameters
143 //
144 // NB: we always use DIBs under Windows CE as this is much simpler (even if
145 // also less efficient...) and we obviously can't use them if there is no
146 // DIB support compiled in at all
147 #ifdef __WXWINCE__
148 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
149
150 #define ALWAYS_USE_DIB
151 #elif !wxUSE_WXDIB
152 // no sense in defining wxShouldCreateDIB() as we can't compile code
153 // executed if it is true, so we have to use #if's anyhow
154 #define NEVER_USE_DIB
155 #else // wxUSE_WXDIB && !__WXWINCE__
156 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
157 {
158 // here is the logic:
159 //
160 // (a) if hdc is specified, the caller explicitly wants DDB
161 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
162 // or less DIBs anyhow)
163 // (c) finally, create DIBs under Win9x even if the depth hasn't been
164 // explicitly specified but the current display depth is 24 or
165 // more and the image is "big", i.e. > 16Mb which is the
166 // theoretical limit for DDBs under Win9x
167 //
168 // consequences (all of which seem to make sense):
169 //
170 // (i) by default, DDBs are created (depth == -1 usually)
171 // (ii) DIBs can be created by explicitly specifying the depth
172 // (iii) using a DC always forces creating a DDB
173 return !hdc &&
174 (d >= 24 ||
175 (d == -1 &&
176 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
177 }
178
179 #define SOMETIMES_USE_DIB
180 #endif // different DIB usage scenarious
181
182 // ----------------------------------------------------------------------------
183 // wxBitmapRefData
184 // ----------------------------------------------------------------------------
185
186 wxBitmapRefData::wxBitmapRefData()
187 {
188 #ifdef __WXDEBUG__
189 m_selectedInto = NULL;
190 #endif
191 m_bitmapMask = NULL;
192
193 m_hBitmap = (WXHBITMAP) NULL;
194 #if wxUSE_WXDIB
195 m_dib = NULL;
196 #endif
197
198 m_isDIB =
199 m_hasAlpha = false;
200 }
201
202 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
203 : wxGDIImageRefData(data)
204 {
205 #ifdef __WXDEBUG__
206 m_selectedInto = NULL;
207 #endif
208
209 // (deep) copy the mask if present
210 m_bitmapMask = NULL;
211 if (data.m_bitmapMask)
212 m_bitmapMask = new wxMask(*data.m_bitmapMask);
213
214 // FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
215 // CloneGDIRefData()
216
217 wxASSERT_MSG( !data.m_isDIB,
218 _T("can't copy bitmap locked for raw access!") );
219 m_isDIB = false;
220
221 m_hasAlpha = data.m_hasAlpha;
222 }
223
224 void wxBitmapRefData::Free()
225 {
226 wxASSERT_MSG( !m_selectedInto,
227 wxT("deleting bitmap still selected into wxMemoryDC") );
228
229 #if wxUSE_WXDIB
230 wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
231 #endif
232
233 if ( m_hBitmap)
234 {
235 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
236 {
237 wxLogLastError(wxT("DeleteObject(hbitmap)"));
238 }
239 }
240
241 delete m_bitmapMask;
242 m_bitmapMask = NULL;
243 }
244
245 // ----------------------------------------------------------------------------
246 // wxBitmap creation
247 // ----------------------------------------------------------------------------
248
249 wxGDIImageRefData *wxBitmap::CreateData() const
250 {
251 return new wxBitmapRefData;
252 }
253
254 wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *dataOrig) const
255 {
256 const wxBitmapRefData *
257 data = wx_static_cast(const wxBitmapRefData *, dataOrig);
258 if ( !data )
259 return NULL;
260
261 // FIXME: this method is backwards, it should just create a new
262 // wxBitmapRefData using its copy ctor but instead it modifies this
263 // bitmap itself and then returns its m_refData -- which works, of
264 // course (except in !wxUSE_WXDIB), but is completely illogical
265 wxBitmap *self = wx_const_cast(wxBitmap *, this);
266
267 wxBitmapRefData *selfdata;
268 #if wxUSE_WXDIB
269 // copy the other bitmap
270 if ( data->m_hBitmap )
271 {
272 wxDIB dib((HBITMAP)(data->m_hBitmap));
273 self->CopyFromDIB(dib);
274
275 selfdata = wx_static_cast(wxBitmapRefData *, m_refData);
276 selfdata->m_hasAlpha = data->m_hasAlpha;
277 }
278 else
279 #endif // wxUSE_WXDIB
280 {
281 // copy the bitmap data
282 selfdata = new wxBitmapRefData(*data);
283 self->m_refData = selfdata;
284 }
285
286 // copy also the mask
287 wxMask * const maskSrc = data->GetMask();
288 if ( maskSrc )
289 {
290 selfdata->SetMask(new wxMask(*maskSrc));
291 }
292
293 return selfdata;
294 }
295
296 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
297 wxBitmapTransparency transp)
298 {
299 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
300 // it may be either HICON or HCURSOR
301 HICON hicon = (HICON)icon.GetHandle();
302
303 ICONINFO iconInfo;
304 if ( !::GetIconInfo(hicon, &iconInfo) )
305 {
306 wxLogLastError(wxT("GetIconInfo"));
307
308 return false;
309 }
310
311 wxBitmapRefData *refData = new wxBitmapRefData;
312 m_refData = refData;
313
314 int w = icon.GetWidth(),
315 h = icon.GetHeight();
316
317 refData->m_width = w;
318 refData->m_height = h;
319 refData->m_depth = wxDisplayDepth();
320
321 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
322
323 switch ( transp )
324 {
325 default:
326 wxFAIL_MSG( _T("unknown wxBitmapTransparency value") );
327
328 case wxBitmapTransparency_None:
329 // nothing to do, refData->m_hasAlpha is false by default
330 break;
331
332 case wxBitmapTransparency_Auto:
333 #if wxUSE_WXDIB
334 // If the icon is 32 bits per pixel then it may have alpha channel
335 // data, although there are some icons that are 32 bpp but have no
336 // alpha... So convert to a DIB and manually check the 4th byte for
337 // each pixel.
338 {
339 BITMAP bm;
340 if ( ::GetObject(iconInfo.hbmColor, sizeof(bm), &bm) &&
341 (bm.bmBitsPixel == 32) )
342 {
343 wxDIB dib(iconInfo.hbmColor);
344 if (dib.IsOk())
345 {
346 const unsigned char* pixels = dib.GetData();
347 for (int idx = 0; idx < w*h*4; idx+=4)
348 {
349 if (pixels[idx+3] != 0)
350 {
351 // If there is an alpha byte that is non-zero
352 // then set the alpha flag and stop checking
353 refData->m_hasAlpha = true;
354 break;
355 }
356 }
357 }
358 }
359 }
360 break;
361 #endif // wxUSE_WXDIB
362
363 case wxBitmapTransparency_Always:
364 refData->m_hasAlpha = true;
365 break;
366 }
367
368 if ( !refData->m_hasAlpha )
369 {
370 // the mask returned by GetIconInfo() is inverted compared to the usual
371 // wxWin convention
372 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
373 }
374
375 // delete the old one now as we don't need it any more
376 ::DeleteObject(iconInfo.hbmMask);
377
378 return true;
379 #else // __WXMICROWIN__ || __WXWINCE__
380 wxUnusedVar(icon);
381 wxUnusedVar(transp);
382
383 return false;
384 #endif // !__WXWINCE__/__WXWINCE__
385 }
386
387 bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp)
388 {
389 UnRef();
390
391 if ( !cursor.Ok() )
392 return false;
393
394 return CopyFromIconOrCursor(cursor, transp);
395 }
396
397 bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp)
398 {
399 UnRef();
400
401 if ( !icon.Ok() )
402 return false;
403
404 return CopyFromIconOrCursor(icon, transp);
405 }
406
407 #ifndef NEVER_USE_DIB
408
409 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
410 {
411 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
412
413 #ifdef SOMETIMES_USE_DIB
414 HBITMAP hbitmap = dib.CreateDDB();
415 if ( !hbitmap )
416 return false;
417 #else // ALWAYS_USE_DIB
418 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
419 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
420
421 UnRef();
422
423 wxBitmapRefData *refData = new wxBitmapRefData;
424 m_refData = refData;
425
426 refData->m_width = dib.GetWidth();
427 refData->m_height = dib.GetHeight();
428 refData->m_depth = dib.GetDepth();
429
430 refData->m_hBitmap = (WXHBITMAP)hbitmap;
431
432 #if wxUSE_PALETTE
433 wxPalette *palette = dib.CreatePalette();
434 if ( palette )
435 {
436 refData->m_bitmapPalette = *palette;
437 }
438
439 delete palette;
440 #endif // wxUSE_PALETTE
441
442 return true;
443 }
444
445 #endif // NEVER_USE_DIB
446
447 wxBitmap::~wxBitmap()
448 {
449 }
450
451 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
452 {
453 #ifndef __WXMICROWIN__
454 wxBitmapRefData *refData = new wxBitmapRefData;
455 m_refData = refData;
456
457 refData->m_width = width;
458 refData->m_height = height;
459 refData->m_depth = depth;
460
461 char *data;
462 if ( depth == 1 )
463 {
464 // we assume that it is in XBM format which is not quite the same as
465 // the format CreateBitmap() wants because the order of bytes in the
466 // line is reversed!
467 const size_t bytesPerLine = (width + 7) / 8;
468 const size_t padding = bytesPerLine % 2;
469 const size_t len = height * ( padding + bytesPerLine );
470 data = (char *)malloc(len);
471 const char *src = bits;
472 char *dst = data;
473
474 for ( int rows = 0; rows < height; rows++ )
475 {
476 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
477 {
478 unsigned char val = *src++;
479 unsigned char reversed = 0;
480
481 for ( int bits = 0; bits < 8; bits++)
482 {
483 reversed <<= 1;
484 reversed |= (unsigned char)(val & 0x01);
485 val >>= 1;
486 }
487 *dst++ = ~reversed;
488 }
489
490 if ( padding )
491 *dst++ = 0;
492 }
493 }
494 else
495 {
496 // bits should already be in Windows standard format
497 data = (char *)bits; // const_cast is harmless
498 }
499
500 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
501 if ( !hbmp )
502 {
503 wxLogLastError(wxT("CreateBitmap"));
504 }
505
506 if ( data != bits )
507 {
508 free(data);
509 }
510
511 SetHBITMAP((WXHBITMAP)hbmp);
512 #endif
513 }
514
515 wxBitmap::wxBitmap(int w, int h, int d)
516 {
517 (void)Create(w, h, d);
518 }
519
520 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
521 {
522 (void)Create(w, h, dc);
523 }
524
525 wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
526 {
527 (void)Create(data, type, width, height, depth);
528 }
529
530 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
531 {
532 LoadFile(filename, type);
533 }
534
535 bool wxBitmap::Create(int width, int height, int depth)
536 {
537 return DoCreate(width, height, depth, 0);
538 }
539
540 bool wxBitmap::Create(int width, int height, const wxDC& dc)
541 {
542 wxCHECK_MSG( dc.IsOk(), false, _T("invalid HDC in wxBitmap::Create()") );
543
544 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
545
546 if (impl)
547 return DoCreate(width, height, -1, impl->GetHDC());
548 else
549 return false;
550 }
551
552 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
553 {
554 UnRef();
555
556 m_refData = new wxBitmapRefData;
557
558 GetBitmapData()->m_width = w;
559 GetBitmapData()->m_height = h;
560
561 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
562
563 #ifndef NEVER_USE_DIB
564 if ( wxShouldCreateDIB(w, h, d, hdc) )
565 {
566 if ( d == -1 )
567 {
568 // create DIBs without alpha channel by default
569 d = 24;
570 }
571
572 wxDIB dib(w, h, d);
573 if ( !dib.IsOk() )
574 return false;
575
576 // don't delete the DIB section in dib object dtor
577 hbmp = dib.Detach();
578
579 GetBitmapData()->m_isDIB = true;
580 GetBitmapData()->m_depth = d;
581 }
582 else // create a DDB
583 #endif // NEVER_USE_DIB
584 {
585 #ifndef ALWAYS_USE_DIB
586 #ifndef __WXMICROWIN__
587 if ( d > 0 )
588 {
589 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
590 if ( !hbmp )
591 {
592 wxLogLastError(wxT("CreateBitmap"));
593 }
594
595 GetBitmapData()->m_depth = d;
596 }
597 else // d == 0, create bitmap compatible with the screen
598 #endif // !__WXMICROWIN__
599 {
600 ScreenHDC dc;
601 hbmp = ::CreateCompatibleBitmap(dc, w, h);
602 if ( !hbmp )
603 {
604 wxLogLastError(wxT("CreateCompatibleBitmap"));
605 }
606
607 GetBitmapData()->m_depth = wxDisplayDepth();
608 }
609 #endif // !ALWAYS_USE_DIB
610 }
611
612 SetHBITMAP((WXHBITMAP)hbmp);
613
614 return Ok();
615 }
616
617 #if wxUSE_IMAGE
618
619 // ----------------------------------------------------------------------------
620 // wxImage to/from conversions for Microwin
621 // ----------------------------------------------------------------------------
622
623 // Microwin versions are so different from normal ones that it really doesn't
624 // make sense to use #ifdefs inside the function bodies
625 #ifdef __WXMICROWIN__
626
627 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
628 {
629 // Set this to 1 to experiment with mask code,
630 // which currently doesn't work
631 #define USE_MASKS 0
632
633 m_refData = new wxBitmapRefData();
634
635 // Initial attempt at a simple-minded implementation.
636 // The bitmap will always be created at the screen depth,
637 // so the 'depth' argument is ignored.
638
639 HDC hScreenDC = ::GetDC(NULL);
640 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
641
642 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
643 HBITMAP hMaskBitmap = NULL;
644 HBITMAP hOldMaskBitmap = NULL;
645 HDC hMaskDC = NULL;
646 unsigned char maskR = 0;
647 unsigned char maskG = 0;
648 unsigned char maskB = 0;
649
650 // printf("Created bitmap %d\n", (int) hBitmap);
651 if (hBitmap == NULL)
652 {
653 ::ReleaseDC(NULL, hScreenDC);
654 return false;
655 }
656 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
657
658 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
659 ::ReleaseDC(NULL, hScreenDC);
660
661 // created an mono-bitmap for the possible mask
662 bool hasMask = image.HasMask();
663
664 if ( hasMask )
665 {
666 #if USE_MASKS
667 // FIXME: we should be able to pass bpp = 1, but
668 // GdBlit can't handle a different depth
669 #if 0
670 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
671 #else
672 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
673 #endif
674 maskR = image.GetMaskRed();
675 maskG = image.GetMaskGreen();
676 maskB = image.GetMaskBlue();
677
678 if (!hMaskBitmap)
679 {
680 hasMask = false;
681 }
682 else
683 {
684 hScreenDC = ::GetDC(NULL);
685 hMaskDC = ::CreateCompatibleDC(hScreenDC);
686 ::ReleaseDC(NULL, hScreenDC);
687
688 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
689 }
690 #else
691 hasMask = false;
692 #endif
693 }
694
695 int i, j;
696 for (i = 0; i < image.GetWidth(); i++)
697 {
698 for (j = 0; j < image.GetHeight(); j++)
699 {
700 unsigned char red = image.GetRed(i, j);
701 unsigned char green = image.GetGreen(i, j);
702 unsigned char blue = image.GetBlue(i, j);
703
704 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
705
706 if (hasMask)
707 {
708 // scan the bitmap for the transparent colour and set the corresponding
709 // pixels in the mask to BLACK and the rest to WHITE
710 if (maskR == red && maskG == green && maskB == blue)
711 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
712 else
713 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
714 }
715 }
716 }
717
718 ::SelectObject(hMemDC, hOldBitmap);
719 ::DeleteDC(hMemDC);
720 if (hasMask)
721 {
722 ::SelectObject(hMaskDC, hOldMaskBitmap);
723 ::DeleteDC(hMaskDC);
724
725 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
726 }
727
728 SetWidth(image.GetWidth());
729 SetHeight(image.GetHeight());
730 SetDepth(screenDepth);
731 SetHBITMAP( (WXHBITMAP) hBitmap );
732
733 #if wxUSE_PALETTE
734 // Copy the palette from the source image
735 SetPalette(image.GetPalette());
736 #endif // wxUSE_PALETTE
737
738 return true;
739 }
740
741 wxImage wxBitmap::ConvertToImage() const
742 {
743 // Initial attempt at a simple-minded implementation.
744 // The bitmap will always be created at the screen depth,
745 // so the 'depth' argument is ignored.
746 // TODO: transparency (create a mask image)
747
748 if (!Ok())
749 {
750 wxFAIL_MSG( wxT("bitmap is invalid") );
751 return wxNullImage;
752 }
753
754 wxImage image;
755
756 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
757
758 // create an wxImage object
759 int width = GetWidth();
760 int height = GetHeight();
761 image.Create( width, height );
762 unsigned char *data = image.GetData();
763 if( !data )
764 {
765 wxFAIL_MSG( wxT("could not allocate data for image") );
766 return wxNullImage;
767 }
768
769 HDC hScreenDC = ::GetDC(NULL);
770
771 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
772 ::ReleaseDC(NULL, hScreenDC);
773
774 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
775
776 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
777
778 int i, j;
779 for (i = 0; i < GetWidth(); i++)
780 {
781 for (j = 0; j < GetHeight(); j++)
782 {
783 COLORREF color = ::GetPixel(hMemDC, i, j);
784 unsigned char red = GetRValue(color);
785 unsigned char green = GetGValue(color);
786 unsigned char blue = GetBValue(color);
787
788 image.SetRGB(i, j, red, green, blue);
789 }
790 }
791
792 ::SelectObject(hMemDC, hOldBitmap);
793 ::DeleteDC(hMemDC);
794
795 #if wxUSE_PALETTE
796 // Copy the palette from the source image
797 if (GetPalette())
798 image.SetPalette(* GetPalette());
799 #endif // wxUSE_PALETTE
800
801 return image;
802 }
803
804 #endif // __WXMICROWIN__
805
806 // ----------------------------------------------------------------------------
807 // wxImage to/from conversions
808 // ----------------------------------------------------------------------------
809
810 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
811 {
812 return CreateFromImage(image, depth, 0);
813 }
814
815 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
816 {
817 wxCHECK_MSG( dc.IsOk(), false,
818 _T("invalid HDC in wxBitmap::CreateFromImage()") );
819
820 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
821
822 if (impl)
823 return CreateFromImage(image, -1, impl->GetHDC());
824 else
825 return false;
826 }
827
828 #if wxUSE_WXDIB
829
830 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
831 {
832 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
833
834 UnRef();
835
836 // first convert the image to DIB
837 const int h = image.GetHeight();
838 const int w = image.GetWidth();
839
840 wxDIB dib(image);
841 if ( !dib.IsOk() )
842 return false;
843
844 const bool hasAlpha = image.HasAlpha();
845
846 // store the bitmap parameters
847 wxBitmapRefData * const refData = new wxBitmapRefData;
848 refData->m_width = w;
849 refData->m_height = h;
850 refData->m_hasAlpha = hasAlpha;
851 refData->m_depth = depth == -1 ? (hasAlpha ? 32 : 24)
852 : depth;
853
854 m_refData = refData;
855
856
857 // next either store DIB as is or create a DDB from it
858 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
859
860 // are we going to use DIB?
861 //
862 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
863 if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
864 {
865 // don't delete the DIB section in dib object dtor
866 hbitmap = dib.Detach();
867
868 refData->m_isDIB = true;
869 }
870 #ifndef ALWAYS_USE_DIB
871 else // we need to convert DIB to DDB
872 {
873 hbitmap = dib.CreateDDB((HDC)hdc);
874 }
875 #endif // !ALWAYS_USE_DIB
876
877 // validate this object
878 SetHBITMAP((WXHBITMAP)hbitmap);
879
880 // finally also set the mask if we have one
881 if ( image.HasMask() )
882 {
883 const size_t len = 2*((w+15)/16);
884 BYTE *src = image.GetData();
885 BYTE *data = new BYTE[h*len];
886 memset(data, 0, h*len);
887 BYTE r = image.GetMaskRed(),
888 g = image.GetMaskGreen(),
889 b = image.GetMaskBlue();
890 BYTE *dst = data;
891 for ( int y = 0; y < h; y++, dst += len )
892 {
893 BYTE *dstLine = dst;
894 BYTE mask = 0x80;
895 for ( int x = 0; x < w; x++, src += 3 )
896 {
897 if (src[0] != r || src[1] != g || src[2] != b)
898 *dstLine |= mask;
899
900 if ( (mask >>= 1) == 0 )
901 {
902 dstLine++;
903 mask = 0x80;
904 }
905 }
906 }
907
908 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
909 if ( !hbitmap )
910 {
911 wxLogLastError(_T("CreateBitmap(mask)"));
912 }
913 else
914 {
915 SetMask(new wxMask((WXHBITMAP)hbitmap));
916 }
917
918 delete[] data;
919 }
920
921 return true;
922 }
923
924 wxImage wxBitmap::ConvertToImage() const
925 {
926 // convert DDB to DIB
927 wxDIB dib(*this);
928
929 if ( !dib.IsOk() )
930 {
931 return wxNullImage;
932 }
933
934 // and then DIB to our wxImage
935 wxImage image = dib.ConvertToImage();
936 if ( !image.Ok() )
937 {
938 return wxNullImage;
939 }
940
941 // now do the same for the mask, if we have any
942 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
943 if ( hbmpMask )
944 {
945 wxDIB dibMask(hbmpMask);
946 if ( dibMask.IsOk() )
947 {
948 // TODO: use wxRawBitmap to iterate over DIB
949
950 // we hard code the mask colour for now but we could also make an
951 // effort (and waste time) to choose a colour not present in the
952 // image already to avoid having to fudge the pixels below --
953 // whether it's worth to do it is unclear however
954 static const int MASK_RED = 1;
955 static const int MASK_GREEN = 2;
956 static const int MASK_BLUE = 3;
957 static const int MASK_BLUE_REPLACEMENT = 2;
958
959 const int h = dibMask.GetHeight();
960 const int w = dibMask.GetWidth();
961 const int bpp = dibMask.GetDepth();
962 const int maskBytesPerPixel = bpp >> 3;
963 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
964 unsigned char *data = image.GetData();
965
966 // remember that DIBs are stored in bottom to top order
967 unsigned char *
968 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
969
970 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
971 {
972 // traverse one mask DIB line
973 unsigned char *mask = maskLineStart;
974 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
975 {
976 // should this pixel be transparent?
977 if ( *mask )
978 {
979 // no, check that it isn't transparent by accident
980 if ( (data[0] == MASK_RED) &&
981 (data[1] == MASK_GREEN) &&
982 (data[2] == MASK_BLUE) )
983 {
984 // we have to fudge the colour a bit to prevent
985 // this pixel from appearing transparent
986 data[2] = MASK_BLUE_REPLACEMENT;
987 }
988
989 data += 3;
990 }
991 else // yes, transparent pixel
992 {
993 *data++ = MASK_RED;
994 *data++ = MASK_GREEN;
995 *data++ = MASK_BLUE;
996 }
997 }
998 }
999
1000 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
1001 }
1002 }
1003
1004 return image;
1005 }
1006
1007 #else // !wxUSE_WXDIB
1008
1009 bool
1010 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1011 int WXUNUSED(depth),
1012 WXHDC WXUNUSED(hdc))
1013 {
1014 return false;
1015 }
1016
1017 wxImage wxBitmap::ConvertToImage() const
1018 {
1019 return wxImage();
1020 }
1021
1022 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1023
1024 #endif // wxUSE_IMAGE
1025
1026 // ----------------------------------------------------------------------------
1027 // loading and saving bitmaps
1028 // ----------------------------------------------------------------------------
1029
1030 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
1031 {
1032 UnRef();
1033
1034 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1035
1036 if ( handler )
1037 {
1038 m_refData = new wxBitmapRefData;
1039
1040 return handler->LoadFile(this, filename, type, -1, -1);
1041 }
1042 #if wxUSE_IMAGE && wxUSE_WXDIB
1043 else // no bitmap handler found
1044 {
1045 wxImage image;
1046 if ( image.LoadFile( filename, type ) && image.Ok() )
1047 {
1048 *this = wxBitmap(image);
1049
1050 return true;
1051 }
1052 }
1053 #endif // wxUSE_IMAGE
1054
1055 return false;
1056 }
1057
1058 bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
1059 {
1060 UnRef();
1061
1062 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1063
1064 if ( !handler )
1065 {
1066 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1067
1068 return false;
1069 }
1070
1071 m_refData = new wxBitmapRefData;
1072
1073 return handler->Create(this, data, type, width, height, depth);
1074 }
1075
1076 bool wxBitmap::SaveFile(const wxString& filename,
1077 wxBitmapType type,
1078 const wxPalette *palette) const
1079 {
1080 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1081
1082 if ( handler )
1083 {
1084 return handler->SaveFile(this, filename, type, palette);
1085 }
1086 #if wxUSE_IMAGE && wxUSE_WXDIB
1087 else // no bitmap handler found
1088 {
1089 // FIXME what about palette? shouldn't we use it?
1090 wxImage image = ConvertToImage();
1091 if ( image.Ok() )
1092 {
1093 return image.SaveFile(filename, type);
1094 }
1095 }
1096 #endif // wxUSE_IMAGE
1097
1098 return false;
1099 }
1100
1101 // ----------------------------------------------------------------------------
1102 // sub bitmap extraction
1103 // ----------------------------------------------------------------------------
1104 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1105 {
1106 MemoryHDC dcSrc;
1107 SelectInHDC selectSrc(dcSrc, GetHbitmap());
1108 return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1109 }
1110
1111 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1112 {
1113 wxCHECK_MSG( Ok() &&
1114 (rect.x >= 0) && (rect.y >= 0) &&
1115 (rect.x+rect.width <= GetWidth()) &&
1116 (rect.y+rect.height <= GetHeight()),
1117 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1118
1119 wxBitmap ret( rect.width, rect.height, GetDepth() );
1120 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1121
1122 #ifndef __WXMICROWIN__
1123 // handle alpha channel, if any
1124 if (HasAlpha())
1125 ret.UseAlpha();
1126
1127 // copy bitmap data
1128 MemoryHDC dcSrc,
1129 dcDst;
1130
1131 {
1132 SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1133
1134 if ( !selectDst )
1135 {
1136 wxLogLastError(_T("SelectObject(destBitmap)"));
1137 }
1138
1139 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1140 (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1141 {
1142 wxLogLastError(_T("BitBlt"));
1143 }
1144 }
1145
1146 // copy mask if there is one
1147 if ( GetMask() )
1148 {
1149 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1150
1151 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1152 selectDst(dcDst, hbmpMask);
1153
1154 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1155 dcSrc, rect.x, rect.y, SRCCOPY) )
1156 {
1157 wxLogLastError(_T("BitBlt"));
1158 }
1159
1160 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1161 ret.SetMask(mask);
1162 }
1163 #endif // !__WXMICROWIN__
1164
1165 return ret;
1166 }
1167
1168 // ----------------------------------------------------------------------------
1169 // wxBitmap accessors
1170 // ----------------------------------------------------------------------------
1171
1172 #if wxUSE_PALETTE
1173 wxPalette* wxBitmap::GetPalette() const
1174 {
1175 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1176 : (wxPalette *) NULL;
1177 }
1178 #endif
1179
1180 wxMask *wxBitmap::GetMask() const
1181 {
1182 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1183 }
1184
1185 wxBitmap wxBitmap::GetMaskBitmap() const
1186 {
1187 wxBitmap bmp;
1188 wxMask *mask = GetMask();
1189 if ( mask )
1190 bmp.SetHBITMAP(mask->GetMaskBitmap());
1191 return bmp;
1192 }
1193
1194 #ifdef __WXDEBUG__
1195
1196 wxDC *wxBitmap::GetSelectedInto() const
1197 {
1198 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1199 }
1200
1201 #endif
1202
1203 void wxBitmap::UseAlpha()
1204 {
1205 if ( GetBitmapData() )
1206 GetBitmapData()->m_hasAlpha = true;
1207 }
1208
1209 bool wxBitmap::HasAlpha() const
1210 {
1211 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1212 }
1213
1214 // ----------------------------------------------------------------------------
1215 // wxBitmap setters
1216 // ----------------------------------------------------------------------------
1217
1218 #ifdef __WXDEBUG__
1219
1220 void wxBitmap::SetSelectedInto(wxDC *dc)
1221 {
1222 if ( GetBitmapData() )
1223 GetBitmapData()->m_selectedInto = dc;
1224 }
1225
1226 #endif
1227
1228 #if wxUSE_PALETTE
1229
1230 void wxBitmap::SetPalette(const wxPalette& palette)
1231 {
1232 AllocExclusive();
1233
1234 GetBitmapData()->m_bitmapPalette = palette;
1235 }
1236
1237 #endif // wxUSE_PALETTE
1238
1239 void wxBitmap::SetMask(wxMask *mask)
1240 {
1241 AllocExclusive();
1242
1243 GetBitmapData()->SetMask(mask);
1244 }
1245
1246 // ----------------------------------------------------------------------------
1247 // raw bitmap access support
1248 // ----------------------------------------------------------------------------
1249
1250 #ifdef wxHAS_RAW_BITMAP
1251
1252 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1253 {
1254 #if wxUSE_WXDIB
1255 if ( !Ok() )
1256 {
1257 // no bitmap, no data (raw or otherwise)
1258 return NULL;
1259 }
1260
1261 // if we're already a DIB we can access our data directly, but if not we
1262 // need to convert this DDB to a DIB section and use it for raw access and
1263 // then convert it back
1264 HBITMAP hDIB;
1265 if ( !GetBitmapData()->m_isDIB )
1266 {
1267 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1268 _T("GetRawData() may be called only once") );
1269
1270 wxDIB *dib = new wxDIB(*this);
1271 if ( !dib->IsOk() )
1272 {
1273 delete dib;
1274
1275 return NULL;
1276 }
1277
1278 // we'll free it in UngetRawData()
1279 GetBitmapData()->m_dib = dib;
1280
1281 hDIB = dib->GetHandle();
1282 }
1283 else // we're a DIB
1284 {
1285 hDIB = GetHbitmap();
1286 }
1287
1288 DIBSECTION ds;
1289 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1290 {
1291 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1292
1293 return NULL;
1294 }
1295
1296 // check that the bitmap is in correct format
1297 if ( ds.dsBm.bmBitsPixel != bpp )
1298 {
1299 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1300
1301 return NULL;
1302 }
1303
1304 // ok, store the relevant info in wxPixelDataBase
1305 const LONG h = ds.dsBm.bmHeight;
1306
1307 data.m_width = ds.dsBm.bmWidth;
1308 data.m_height = h;
1309
1310 // remember that DIBs are stored in top to bottom order!
1311 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1312 // multiple of 2, as required by the documentation. So we use the official
1313 // formula, which we already use elsewhere.)
1314 const LONG bytesPerRow =
1315 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1316 data.m_stride = -bytesPerRow;
1317
1318 char *bits = (char *)ds.dsBm.bmBits;
1319 if ( h > 1 )
1320 {
1321 bits += (h - 1)*bytesPerRow;
1322 }
1323
1324 return bits;
1325 #else
1326 return NULL;
1327 #endif
1328 }
1329
1330 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1331 {
1332 #if wxUSE_WXDIB
1333 if ( !Ok() )
1334 return;
1335
1336 if ( !&dataBase )
1337 {
1338 // invalid data, don't crash -- but don't assert neither as we're
1339 // called automatically from wxPixelDataBase dtor and so there is no
1340 // way to prevent this from happening
1341 return;
1342 }
1343
1344 // if we're a DDB we need to convert DIB back to DDB now to make the
1345 // changes made via raw bitmap access effective
1346 if ( !GetBitmapData()->m_isDIB )
1347 {
1348 wxDIB *dib = GetBitmapData()->m_dib;
1349 GetBitmapData()->m_dib = NULL;
1350
1351 // TODO: convert
1352
1353 delete dib;
1354 }
1355 #endif // wxUSE_WXDIB
1356 }
1357 #endif // wxHAS_RAW_BITMAP
1358
1359 // ----------------------------------------------------------------------------
1360 // wxMask
1361 // ----------------------------------------------------------------------------
1362
1363 wxMask::wxMask()
1364 {
1365 m_maskBitmap = 0;
1366 }
1367
1368 // Copy constructor
1369 wxMask::wxMask(const wxMask &mask)
1370 : wxObject()
1371 {
1372 BITMAP bmp;
1373
1374 HDC srcDC = CreateCompatibleDC(0);
1375 HDC destDC = CreateCompatibleDC(0);
1376
1377 // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1378 // so we'll use GetObject() API here:
1379 if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1380 {
1381 wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1382 return;
1383 }
1384
1385 // create our HBITMAP
1386 int w = bmp.bmWidth, h = bmp.bmHeight;
1387 m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1388
1389 // copy the mask's HBITMAP into our HBITMAP
1390 SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1391 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1392
1393 BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1394
1395 SelectObject(srcDC, 0);
1396 DeleteDC(srcDC);
1397 SelectObject(destDC, 0);
1398 DeleteDC(destDC);
1399 }
1400
1401 // Construct a mask from a bitmap and a colour indicating
1402 // the transparent area
1403 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1404 {
1405 m_maskBitmap = 0;
1406 Create(bitmap, colour);
1407 }
1408
1409 // Construct a mask from a bitmap and a palette index indicating
1410 // the transparent area
1411 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1412 {
1413 m_maskBitmap = 0;
1414 Create(bitmap, paletteIndex);
1415 }
1416
1417 // Construct a mask from a mono bitmap (copies the bitmap).
1418 wxMask::wxMask(const wxBitmap& bitmap)
1419 {
1420 m_maskBitmap = 0;
1421 Create(bitmap);
1422 }
1423
1424 wxMask::~wxMask()
1425 {
1426 if ( m_maskBitmap )
1427 ::DeleteObject((HBITMAP) m_maskBitmap);
1428 }
1429
1430 // Create a mask from a mono bitmap (copies the bitmap).
1431 bool wxMask::Create(const wxBitmap& bitmap)
1432 {
1433 #ifndef __WXMICROWIN__
1434 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1435 _T("can't create mask from invalid or not monochrome bitmap") );
1436
1437 if ( m_maskBitmap )
1438 {
1439 ::DeleteObject((HBITMAP) m_maskBitmap);
1440 m_maskBitmap = 0;
1441 }
1442
1443 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1444 bitmap.GetWidth(),
1445 bitmap.GetHeight(),
1446 1, 1, 0
1447 );
1448 HDC srcDC = CreateCompatibleDC(0);
1449 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1450 HDC destDC = CreateCompatibleDC(0);
1451 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1452 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1453 SelectObject(srcDC, 0);
1454 DeleteDC(srcDC);
1455 SelectObject(destDC, 0);
1456 DeleteDC(destDC);
1457 return true;
1458 #else
1459 wxUnusedVar(bitmap);
1460 return false;
1461 #endif
1462 }
1463
1464 // Create a mask from a bitmap and a palette index indicating
1465 // the transparent area
1466 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1467 {
1468 if ( m_maskBitmap )
1469 {
1470 ::DeleteObject((HBITMAP) m_maskBitmap);
1471 m_maskBitmap = 0;
1472 }
1473
1474 #if wxUSE_PALETTE
1475 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1476 {
1477 unsigned char red, green, blue;
1478 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1479 {
1480 wxColour transparentColour(red, green, blue);
1481 return Create(bitmap, transparentColour);
1482 }
1483 }
1484 #endif // wxUSE_PALETTE
1485
1486 return false;
1487 }
1488
1489 // Create a mask from a bitmap and a colour indicating
1490 // the transparent area
1491 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1492 {
1493 #ifndef __WXMICROWIN__
1494 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1495
1496 if ( m_maskBitmap )
1497 {
1498 ::DeleteObject((HBITMAP) m_maskBitmap);
1499 m_maskBitmap = 0;
1500 }
1501
1502 int width = bitmap.GetWidth(),
1503 height = bitmap.GetHeight();
1504
1505 // scan the bitmap for the transparent colour and set the corresponding
1506 // pixels in the mask to BLACK and the rest to WHITE
1507 COLORREF maskColour = wxColourToPalRGB(colour);
1508 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1509
1510 HDC srcDC = ::CreateCompatibleDC(NULL);
1511 HDC destDC = ::CreateCompatibleDC(NULL);
1512 if ( !srcDC || !destDC )
1513 {
1514 wxLogLastError(wxT("CreateCompatibleDC"));
1515 }
1516
1517 bool ok = true;
1518
1519 // SelectObject() will fail
1520 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1521 _T("bitmap can't be selected in another DC") );
1522
1523 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1524 if ( !hbmpSrcOld )
1525 {
1526 wxLogLastError(wxT("SelectObject"));
1527
1528 ok = false;
1529 }
1530
1531 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1532 if ( !hbmpDstOld )
1533 {
1534 wxLogLastError(wxT("SelectObject"));
1535
1536 ok = false;
1537 }
1538
1539 if ( ok )
1540 {
1541 // this will create a monochrome bitmap with 0 points for the pixels
1542 // which have the same value as the background colour and 1 for the
1543 // others
1544 ::SetBkColor(srcDC, maskColour);
1545 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1546 }
1547
1548 ::SelectObject(srcDC, hbmpSrcOld);
1549 ::DeleteDC(srcDC);
1550 ::SelectObject(destDC, hbmpDstOld);
1551 ::DeleteDC(destDC);
1552
1553 return ok;
1554 #else // __WXMICROWIN__
1555 wxUnusedVar(bitmap);
1556 wxUnusedVar(colour);
1557 return false;
1558 #endif // __WXMICROWIN__/!__WXMICROWIN__
1559 }
1560
1561 // ----------------------------------------------------------------------------
1562 // wxBitmapHandler
1563 // ----------------------------------------------------------------------------
1564
1565 bool wxBitmapHandler::Create(wxGDIImage *image,
1566 const void* data,
1567 wxBitmapType type,
1568 int width, int height, int depth)
1569 {
1570 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1571
1572 return bitmap && Create(bitmap, data, type, width, height, depth);
1573 }
1574
1575 bool wxBitmapHandler::Load(wxGDIImage *image,
1576 const wxString& name,
1577 wxBitmapType type,
1578 int width, int height)
1579 {
1580 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1581
1582 return bitmap && LoadFile(bitmap, name, type, width, height);
1583 }
1584
1585 bool wxBitmapHandler::Save(const wxGDIImage *image,
1586 const wxString& name,
1587 wxBitmapType type) const
1588 {
1589 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1590
1591 return bitmap && SaveFile(bitmap, name, type);
1592 }
1593
1594 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1595 const void* WXUNUSED(data),
1596 wxBitmapType WXUNUSED(type),
1597 int WXUNUSED(width),
1598 int WXUNUSED(height),
1599 int WXUNUSED(depth))
1600 {
1601 return false;
1602 }
1603
1604 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1605 const wxString& WXUNUSED(name),
1606 wxBitmapType WXUNUSED(type),
1607 int WXUNUSED(desiredWidth),
1608 int WXUNUSED(desiredHeight))
1609 {
1610 return false;
1611 }
1612
1613 bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap),
1614 const wxString& WXUNUSED(name),
1615 wxBitmapType WXUNUSED(type),
1616 const wxPalette *WXUNUSED(palette)) const
1617 {
1618 return false;
1619 }
1620
1621 // ----------------------------------------------------------------------------
1622 // global helper functions implemented here
1623 // ----------------------------------------------------------------------------
1624
1625 // helper of wxBitmapToHICON/HCURSOR
1626 static
1627 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1628 bool iconWanted,
1629 int hotSpotX,
1630 int hotSpotY)
1631 {
1632 if ( !bmp.Ok() )
1633 {
1634 // we can't create an icon/cursor form nothing
1635 return 0;
1636 }
1637
1638 if ( bmp.HasAlpha() )
1639 {
1640 // Create an empty mask bitmap.
1641 // it doesn't seem to work if we mess with the mask at all.
1642 HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1643
1644 ICONINFO iconInfo;
1645 wxZeroMemory(iconInfo);
1646 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1647 if ( !iconWanted )
1648 {
1649 iconInfo.xHotspot = hotSpotX;
1650 iconInfo.yHotspot = hotSpotY;
1651 }
1652
1653 iconInfo.hbmMask = hMonoBitmap;
1654 iconInfo.hbmColor = GetHbitmapOf(bmp);
1655
1656 HICON hicon = ::CreateIconIndirect(&iconInfo);
1657
1658 ::DeleteObject(hMonoBitmap);
1659
1660 return hicon;
1661 }
1662
1663 wxMask* mask = bmp.GetMask();
1664
1665 if ( !mask )
1666 {
1667 // we must have a mask for an icon, so even if it's probably incorrect,
1668 // do create it (grey is the "standard" transparent colour)
1669 mask = new wxMask(bmp, *wxLIGHT_GREY);
1670 }
1671
1672 ICONINFO iconInfo;
1673 wxZeroMemory(iconInfo);
1674 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1675 if ( !iconWanted )
1676 {
1677 iconInfo.xHotspot = hotSpotX;
1678 iconInfo.yHotspot = hotSpotY;
1679 }
1680
1681 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1682 iconInfo.hbmColor = GetHbitmapOf(bmp);
1683
1684 // black out the transparent area to preserve background colour, because
1685 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1686 // the mask to the dest rect.
1687 {
1688 MemoryHDC dcSrc, dcDst;
1689 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1690 selectBitmap(dcDst, iconInfo.hbmColor);
1691
1692 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1693 dcSrc, 0, 0, SRCAND) )
1694 {
1695 wxLogLastError(_T("BitBlt"));
1696 }
1697 }
1698
1699 HICON hicon = ::CreateIconIndirect(&iconInfo);
1700
1701 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1702 {
1703 // we created the mask, now delete it
1704 delete mask;
1705 }
1706
1707 // delete the inverted mask bitmap we created as well
1708 ::DeleteObject(iconInfo.hbmMask);
1709
1710 return hicon;
1711 }
1712
1713 HICON wxBitmapToHICON(const wxBitmap& bmp)
1714 {
1715 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1716 }
1717
1718 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1719 {
1720 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1721 }
1722
1723 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1724 {
1725 #ifndef __WXMICROWIN__
1726 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1727
1728 // get width/height from the bitmap if not given
1729 if ( !w || !h )
1730 {
1731 BITMAP bm;
1732 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1733 w = bm.bmWidth;
1734 h = bm.bmHeight;
1735 }
1736
1737 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1738 HDC hdcDst = ::CreateCompatibleDC(NULL);
1739 if ( !hdcSrc || !hdcDst )
1740 {
1741 wxLogLastError(wxT("CreateCompatibleDC"));
1742 }
1743
1744 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1745 if ( !hbmpInvMask )
1746 {
1747 wxLogLastError(wxT("CreateBitmap"));
1748 }
1749
1750 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1751 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1752 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1753 hdcSrc, 0, 0,
1754 NOTSRCCOPY) )
1755 {
1756 wxLogLastError(wxT("BitBlt"));
1757 }
1758
1759 // Deselect objects
1760 SelectObject(hdcSrc,srcTmp);
1761 SelectObject(hdcDst,dstTmp);
1762
1763 ::DeleteDC(hdcSrc);
1764 ::DeleteDC(hdcDst);
1765
1766 return hbmpInvMask;
1767 #else
1768 return 0;
1769 #endif
1770 }
wxWidgets (Impactor)