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first round of debug/release merge: introduce wxDEBUG_LEVEL, for now defined as 1...
[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 // wxBitmapRefData
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 #if wxDEBUG_LEVEL
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_LEVEL
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 #if wxDEBUG_LEVEL
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 #if wxDEBUG_LEVEL
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 = 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 = 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 = 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, const wxDC& dc)
516 {
517 (void)Create(w, h, dc);
518 }
519
520 wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
521 {
522 (void)Create(data, type, width, height, depth);
523 }
524
525 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
526 {
527 LoadFile(filename, type);
528 }
529
530 bool wxBitmap::Create(int width, int height, int depth)
531 {
532 return DoCreate(width, height, depth, 0);
533 }
534
535 bool wxBitmap::Create(int width, int height, const wxDC& dc)
536 {
537 wxCHECK_MSG( dc.IsOk(), false, _T("invalid HDC in wxBitmap::Create()") );
538
539 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
540
541 if (impl)
542 return DoCreate(width, height, -1, impl->GetHDC());
543 else
544 return false;
545 }
546
547 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
548 {
549 UnRef();
550
551 m_refData = new wxBitmapRefData;
552
553 GetBitmapData()->m_width = w;
554 GetBitmapData()->m_height = h;
555
556 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
557
558 #ifndef NEVER_USE_DIB
559 if ( wxShouldCreateDIB(w, h, d, hdc) )
560 {
561 if ( d == -1 )
562 {
563 // create DIBs without alpha channel by default
564 d = 24;
565 }
566
567 wxDIB dib(w, h, d);
568 if ( !dib.IsOk() )
569 return false;
570
571 // don't delete the DIB section in dib object dtor
572 hbmp = dib.Detach();
573
574 GetBitmapData()->m_isDIB = true;
575 GetBitmapData()->m_depth = d;
576 }
577 else // create a DDB
578 #endif // NEVER_USE_DIB
579 {
580 #ifndef ALWAYS_USE_DIB
581 #ifndef __WXMICROWIN__
582 if ( d > 0 )
583 {
584 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
585 if ( !hbmp )
586 {
587 wxLogLastError(wxT("CreateBitmap"));
588 }
589
590 GetBitmapData()->m_depth = d;
591 }
592 else // d == 0, create bitmap compatible with the screen
593 #endif // !__WXMICROWIN__
594 {
595 ScreenHDC dc;
596 hbmp = ::CreateCompatibleBitmap(dc, w, h);
597 if ( !hbmp )
598 {
599 wxLogLastError(wxT("CreateCompatibleBitmap"));
600 }
601
602 GetBitmapData()->m_depth = wxDisplayDepth();
603 }
604 #endif // !ALWAYS_USE_DIB
605 }
606
607 SetHBITMAP((WXHBITMAP)hbmp);
608
609 return Ok();
610 }
611
612 #if wxUSE_IMAGE
613
614 // ----------------------------------------------------------------------------
615 // wxImage to/from conversions for Microwin
616 // ----------------------------------------------------------------------------
617
618 // Microwin versions are so different from normal ones that it really doesn't
619 // make sense to use #ifdefs inside the function bodies
620 #ifdef __WXMICROWIN__
621
622 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
623 {
624 // Set this to 1 to experiment with mask code,
625 // which currently doesn't work
626 #define USE_MASKS 0
627
628 m_refData = new wxBitmapRefData();
629
630 // Initial attempt at a simple-minded implementation.
631 // The bitmap will always be created at the screen depth,
632 // so the 'depth' argument is ignored.
633
634 HDC hScreenDC = ::GetDC(NULL);
635 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
636
637 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
638 HBITMAP hMaskBitmap = NULL;
639 HBITMAP hOldMaskBitmap = NULL;
640 HDC hMaskDC = NULL;
641 unsigned char maskR = 0;
642 unsigned char maskG = 0;
643 unsigned char maskB = 0;
644
645 // printf("Created bitmap %d\n", (int) hBitmap);
646 if (hBitmap == NULL)
647 {
648 ::ReleaseDC(NULL, hScreenDC);
649 return false;
650 }
651 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
652
653 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
654 ::ReleaseDC(NULL, hScreenDC);
655
656 // created an mono-bitmap for the possible mask
657 bool hasMask = image.HasMask();
658
659 if ( hasMask )
660 {
661 #if USE_MASKS
662 // FIXME: we should be able to pass bpp = 1, but
663 // GdBlit can't handle a different depth
664 #if 0
665 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
666 #else
667 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
668 #endif
669 maskR = image.GetMaskRed();
670 maskG = image.GetMaskGreen();
671 maskB = image.GetMaskBlue();
672
673 if (!hMaskBitmap)
674 {
675 hasMask = false;
676 }
677 else
678 {
679 hScreenDC = ::GetDC(NULL);
680 hMaskDC = ::CreateCompatibleDC(hScreenDC);
681 ::ReleaseDC(NULL, hScreenDC);
682
683 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
684 }
685 #else
686 hasMask = false;
687 #endif
688 }
689
690 int i, j;
691 for (i = 0; i < image.GetWidth(); i++)
692 {
693 for (j = 0; j < image.GetHeight(); j++)
694 {
695 unsigned char red = image.GetRed(i, j);
696 unsigned char green = image.GetGreen(i, j);
697 unsigned char blue = image.GetBlue(i, j);
698
699 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
700
701 if (hasMask)
702 {
703 // scan the bitmap for the transparent colour and set the corresponding
704 // pixels in the mask to BLACK and the rest to WHITE
705 if (maskR == red && maskG == green && maskB == blue)
706 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
707 else
708 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
709 }
710 }
711 }
712
713 ::SelectObject(hMemDC, hOldBitmap);
714 ::DeleteDC(hMemDC);
715 if (hasMask)
716 {
717 ::SelectObject(hMaskDC, hOldMaskBitmap);
718 ::DeleteDC(hMaskDC);
719
720 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
721 }
722
723 SetWidth(image.GetWidth());
724 SetHeight(image.GetHeight());
725 SetDepth(screenDepth);
726 SetHBITMAP( (WXHBITMAP) hBitmap );
727
728 #if wxUSE_PALETTE
729 // Copy the palette from the source image
730 SetPalette(image.GetPalette());
731 #endif // wxUSE_PALETTE
732
733 return true;
734 }
735
736 wxImage wxBitmap::ConvertToImage() const
737 {
738 // Initial attempt at a simple-minded implementation.
739 // The bitmap will always be created at the screen depth,
740 // so the 'depth' argument is ignored.
741 // TODO: transparency (create a mask image)
742
743 if (!Ok())
744 {
745 wxFAIL_MSG( wxT("bitmap is invalid") );
746 return wxNullImage;
747 }
748
749 wxImage image;
750
751 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
752
753 // create an wxImage object
754 int width = GetWidth();
755 int height = GetHeight();
756 image.Create( width, height );
757 unsigned char *data = image.GetData();
758 if( !data )
759 {
760 wxFAIL_MSG( wxT("could not allocate data for image") );
761 return wxNullImage;
762 }
763
764 HDC hScreenDC = ::GetDC(NULL);
765
766 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
767 ::ReleaseDC(NULL, hScreenDC);
768
769 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
770
771 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
772
773 int i, j;
774 for (i = 0; i < GetWidth(); i++)
775 {
776 for (j = 0; j < GetHeight(); j++)
777 {
778 COLORREF color = ::GetPixel(hMemDC, i, j);
779 unsigned char red = GetRValue(color);
780 unsigned char green = GetGValue(color);
781 unsigned char blue = GetBValue(color);
782
783 image.SetRGB(i, j, red, green, blue);
784 }
785 }
786
787 ::SelectObject(hMemDC, hOldBitmap);
788 ::DeleteDC(hMemDC);
789
790 #if wxUSE_PALETTE
791 // Copy the palette from the source image
792 if (GetPalette())
793 image.SetPalette(* GetPalette());
794 #endif // wxUSE_PALETTE
795
796 return image;
797 }
798
799 #endif // __WXMICROWIN__
800
801 // ----------------------------------------------------------------------------
802 // wxImage to/from conversions
803 // ----------------------------------------------------------------------------
804
805 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
806 {
807 return CreateFromImage(image, depth, 0);
808 }
809
810 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
811 {
812 wxCHECK_MSG( dc.IsOk(), false,
813 _T("invalid HDC in wxBitmap::CreateFromImage()") );
814
815 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
816
817 if (impl)
818 return CreateFromImage(image, -1, impl->GetHDC());
819 else
820 return false;
821 }
822
823 #if wxUSE_WXDIB
824
825 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
826 {
827 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
828
829 UnRef();
830
831 // first convert the image to DIB
832 const int h = image.GetHeight();
833 const int w = image.GetWidth();
834
835 wxDIB dib(image);
836 if ( !dib.IsOk() )
837 return false;
838
839 const bool hasAlpha = image.HasAlpha();
840
841 if (depth == -1)
842 depth = dib.GetDepth();
843
844 // store the bitmap parameters
845 wxBitmapRefData * const refData = new wxBitmapRefData;
846 refData->m_width = w;
847 refData->m_height = h;
848 refData->m_hasAlpha = hasAlpha;
849 refData->m_depth = depth;
850
851 m_refData = refData;
852
853
854 // next either store DIB as is or create a DDB from it
855 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
856
857 // are we going to use DIB?
858 //
859 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
860 if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
861 {
862 // don't delete the DIB section in dib object dtor
863 hbitmap = dib.Detach();
864
865 refData->m_isDIB = true;
866 }
867 #ifndef ALWAYS_USE_DIB
868 else // we need to convert DIB to DDB
869 {
870 hbitmap = dib.CreateDDB((HDC)hdc);
871 }
872 #endif // !ALWAYS_USE_DIB
873
874 // validate this object
875 SetHBITMAP((WXHBITMAP)hbitmap);
876
877 // finally also set the mask if we have one
878 if ( image.HasMask() )
879 {
880 const size_t len = 2*((w+15)/16);
881 BYTE *src = image.GetData();
882 BYTE *data = new BYTE[h*len];
883 memset(data, 0, h*len);
884 BYTE r = image.GetMaskRed(),
885 g = image.GetMaskGreen(),
886 b = image.GetMaskBlue();
887 BYTE *dst = data;
888 for ( int y = 0; y < h; y++, dst += len )
889 {
890 BYTE *dstLine = dst;
891 BYTE mask = 0x80;
892 for ( int x = 0; x < w; x++, src += 3 )
893 {
894 if (src[0] != r || src[1] != g || src[2] != b)
895 *dstLine |= mask;
896
897 if ( (mask >>= 1) == 0 )
898 {
899 dstLine++;
900 mask = 0x80;
901 }
902 }
903 }
904
905 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
906 if ( !hbitmap )
907 {
908 wxLogLastError(_T("CreateBitmap(mask)"));
909 }
910 else
911 {
912 SetMask(new wxMask((WXHBITMAP)hbitmap));
913 }
914
915 delete[] data;
916 }
917
918 return true;
919 }
920
921 wxImage wxBitmap::ConvertToImage() const
922 {
923 // convert DDB to DIB
924 wxDIB dib(*this);
925
926 if ( !dib.IsOk() )
927 {
928 return wxNullImage;
929 }
930
931 // and then DIB to our wxImage
932 wxImage image = dib.ConvertToImage();
933 if ( !image.Ok() )
934 {
935 return wxNullImage;
936 }
937
938 // now do the same for the mask, if we have any
939 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
940 if ( hbmpMask )
941 {
942 wxDIB dibMask(hbmpMask);
943 if ( dibMask.IsOk() )
944 {
945 // TODO: use wxRawBitmap to iterate over DIB
946
947 // we hard code the mask colour for now but we could also make an
948 // effort (and waste time) to choose a colour not present in the
949 // image already to avoid having to fudge the pixels below --
950 // whether it's worth to do it is unclear however
951 static const int MASK_RED = 1;
952 static const int MASK_GREEN = 2;
953 static const int MASK_BLUE = 3;
954 static const int MASK_BLUE_REPLACEMENT = 2;
955
956 const int h = dibMask.GetHeight();
957 const int w = dibMask.GetWidth();
958 const int bpp = dibMask.GetDepth();
959 const int maskBytesPerPixel = bpp >> 3;
960 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
961 unsigned char *data = image.GetData();
962
963 // remember that DIBs are stored in bottom to top order
964 unsigned char *
965 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
966
967 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
968 {
969 // traverse one mask DIB line
970 unsigned char *mask = maskLineStart;
971 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
972 {
973 // should this pixel be transparent?
974 if ( *mask )
975 {
976 // no, check that it isn't transparent by accident
977 if ( (data[0] == MASK_RED) &&
978 (data[1] == MASK_GREEN) &&
979 (data[2] == MASK_BLUE) )
980 {
981 // we have to fudge the colour a bit to prevent
982 // this pixel from appearing transparent
983 data[2] = MASK_BLUE_REPLACEMENT;
984 }
985
986 data += 3;
987 }
988 else // yes, transparent pixel
989 {
990 *data++ = MASK_RED;
991 *data++ = MASK_GREEN;
992 *data++ = MASK_BLUE;
993 }
994 }
995 }
996
997 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
998 }
999 }
1000
1001 return image;
1002 }
1003
1004 #else // !wxUSE_WXDIB
1005
1006 bool
1007 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1008 int WXUNUSED(depth),
1009 WXHDC WXUNUSED(hdc))
1010 {
1011 return false;
1012 }
1013
1014 wxImage wxBitmap::ConvertToImage() const
1015 {
1016 return wxImage();
1017 }
1018
1019 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1020
1021 #endif // wxUSE_IMAGE
1022
1023 // ----------------------------------------------------------------------------
1024 // loading and saving bitmaps
1025 // ----------------------------------------------------------------------------
1026
1027 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
1028 {
1029 UnRef();
1030
1031 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1032
1033 if ( handler )
1034 {
1035 m_refData = new wxBitmapRefData;
1036
1037 return handler->LoadFile(this, filename, type, -1, -1);
1038 }
1039 #if wxUSE_IMAGE && wxUSE_WXDIB
1040 else // no bitmap handler found
1041 {
1042 wxImage image;
1043 if ( image.LoadFile( filename, type ) && image.Ok() )
1044 {
1045 *this = wxBitmap(image);
1046
1047 return true;
1048 }
1049 }
1050 #endif // wxUSE_IMAGE
1051
1052 return false;
1053 }
1054
1055 bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
1056 {
1057 UnRef();
1058
1059 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1060
1061 if ( !handler )
1062 {
1063 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1064
1065 return false;
1066 }
1067
1068 m_refData = new wxBitmapRefData;
1069
1070 return handler->Create(this, data, type, width, height, depth);
1071 }
1072
1073 bool wxBitmap::SaveFile(const wxString& filename,
1074 wxBitmapType type,
1075 const wxPalette *palette) const
1076 {
1077 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1078
1079 if ( handler )
1080 {
1081 return handler->SaveFile(this, filename, type, palette);
1082 }
1083 #if wxUSE_IMAGE && wxUSE_WXDIB
1084 else // no bitmap handler found
1085 {
1086 // FIXME what about palette? shouldn't we use it?
1087 wxImage image = ConvertToImage();
1088 if ( image.Ok() )
1089 {
1090 return image.SaveFile(filename, type);
1091 }
1092 }
1093 #endif // wxUSE_IMAGE
1094
1095 return false;
1096 }
1097
1098 // ----------------------------------------------------------------------------
1099 // sub bitmap extraction
1100 // ----------------------------------------------------------------------------
1101 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1102 {
1103 MemoryHDC dcSrc;
1104 SelectInHDC selectSrc(dcSrc, GetHbitmap());
1105 return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1106 }
1107
1108 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1109 {
1110 wxCHECK_MSG( Ok() &&
1111 (rect.x >= 0) && (rect.y >= 0) &&
1112 (rect.x+rect.width <= GetWidth()) &&
1113 (rect.y+rect.height <= GetHeight()),
1114 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1115
1116 wxBitmap ret( rect.width, rect.height, GetDepth() );
1117 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1118
1119 #ifndef __WXMICROWIN__
1120 // handle alpha channel, if any
1121 if (HasAlpha())
1122 ret.UseAlpha();
1123
1124 // copy bitmap data
1125 MemoryHDC dcSrc,
1126 dcDst;
1127
1128 {
1129 SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1130
1131 if ( !selectDst )
1132 {
1133 wxLogLastError(_T("SelectObject(destBitmap)"));
1134 }
1135
1136 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1137 (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1138 {
1139 wxLogLastError(_T("BitBlt"));
1140 }
1141 }
1142
1143 // copy mask if there is one
1144 if ( GetMask() )
1145 {
1146 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1147
1148 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1149 selectDst(dcDst, hbmpMask);
1150
1151 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1152 dcSrc, rect.x, rect.y, SRCCOPY) )
1153 {
1154 wxLogLastError(_T("BitBlt"));
1155 }
1156
1157 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1158 ret.SetMask(mask);
1159 }
1160 #endif // !__WXMICROWIN__
1161
1162 return ret;
1163 }
1164
1165 // ----------------------------------------------------------------------------
1166 // wxBitmap accessors
1167 // ----------------------------------------------------------------------------
1168
1169 #if wxUSE_PALETTE
1170 wxPalette* wxBitmap::GetPalette() const
1171 {
1172 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1173 : NULL;
1174 }
1175 #endif
1176
1177 wxMask *wxBitmap::GetMask() const
1178 {
1179 return GetBitmapData() ? GetBitmapData()->GetMask() : NULL;
1180 }
1181
1182 wxBitmap wxBitmap::GetMaskBitmap() const
1183 {
1184 wxBitmap bmp;
1185 wxMask *mask = GetMask();
1186 if ( mask )
1187 bmp.SetHBITMAP(mask->GetMaskBitmap());
1188 return bmp;
1189 }
1190
1191 wxDC *wxBitmap::GetSelectedInto() const
1192 {
1193 #if wxDEBUG_LEVEL
1194 return GetBitmapData() ? GetBitmapData()->m_selectedInto : NULL;
1195 #else
1196 return NULL;
1197 #endif
1198 }
1199
1200 void wxBitmap::UseAlpha()
1201 {
1202 if ( GetBitmapData() )
1203 GetBitmapData()->m_hasAlpha = true;
1204 }
1205
1206 bool wxBitmap::HasAlpha() const
1207 {
1208 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1209 }
1210
1211 // ----------------------------------------------------------------------------
1212 // wxBitmap setters
1213 // ----------------------------------------------------------------------------
1214
1215 void wxBitmap::SetSelectedInto(wxDC *dc)
1216 {
1217 #if wxDEBUG_LEVEL
1218 if ( GetBitmapData() )
1219 GetBitmapData()->m_selectedInto = dc;
1220 #else
1221 wxUnusedVar(dc);
1222 #endif
1223 }
1224
1225 #if wxUSE_PALETTE
1226
1227 void wxBitmap::SetPalette(const wxPalette& palette)
1228 {
1229 AllocExclusive();
1230
1231 GetBitmapData()->m_bitmapPalette = palette;
1232 }
1233
1234 #endif // wxUSE_PALETTE
1235
1236 void wxBitmap::SetMask(wxMask *mask)
1237 {
1238 AllocExclusive();
1239
1240 GetBitmapData()->SetMask(mask);
1241 }
1242
1243 // ----------------------------------------------------------------------------
1244 // raw bitmap access support
1245 // ----------------------------------------------------------------------------
1246
1247 #ifdef wxHAS_RAW_BITMAP
1248
1249 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1250 {
1251 #if wxUSE_WXDIB
1252 if ( !Ok() )
1253 {
1254 // no bitmap, no data (raw or otherwise)
1255 return NULL;
1256 }
1257
1258 // if we're already a DIB we can access our data directly, but if not we
1259 // need to convert this DDB to a DIB section and use it for raw access and
1260 // then convert it back
1261 HBITMAP hDIB;
1262 if ( !GetBitmapData()->m_isDIB )
1263 {
1264 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1265 _T("GetRawData() may be called only once") );
1266
1267 wxDIB *dib = new wxDIB(*this);
1268 if ( !dib->IsOk() )
1269 {
1270 delete dib;
1271
1272 return NULL;
1273 }
1274
1275 // we'll free it in UngetRawData()
1276 GetBitmapData()->m_dib = dib;
1277
1278 hDIB = dib->GetHandle();
1279 }
1280 else // we're a DIB
1281 {
1282 hDIB = GetHbitmap();
1283 }
1284
1285 DIBSECTION ds;
1286 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1287 {
1288 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1289
1290 return NULL;
1291 }
1292
1293 // check that the bitmap is in correct format
1294 if ( ds.dsBm.bmBitsPixel != bpp )
1295 {
1296 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1297
1298 return NULL;
1299 }
1300
1301 // ok, store the relevant info in wxPixelDataBase
1302 const LONG h = ds.dsBm.bmHeight;
1303
1304 data.m_width = ds.dsBm.bmWidth;
1305 data.m_height = h;
1306
1307 // remember that DIBs are stored in top to bottom order!
1308 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1309 // multiple of 2, as required by the documentation. So we use the official
1310 // formula, which we already use elsewhere.)
1311 const LONG bytesPerRow =
1312 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1313 data.m_stride = -bytesPerRow;
1314
1315 char *bits = (char *)ds.dsBm.bmBits;
1316 if ( h > 1 )
1317 {
1318 bits += (h - 1)*bytesPerRow;
1319 }
1320
1321 return bits;
1322 #else
1323 return NULL;
1324 #endif
1325 }
1326
1327 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1328 {
1329 #if wxUSE_WXDIB
1330 if ( !Ok() )
1331 return;
1332
1333 if ( !&dataBase )
1334 {
1335 // invalid data, don't crash -- but don't assert neither as we're
1336 // called automatically from wxPixelDataBase dtor and so there is no
1337 // way to prevent this from happening
1338 return;
1339 }
1340
1341 // if we're a DDB we need to convert DIB back to DDB now to make the
1342 // changes made via raw bitmap access effective
1343 if ( !GetBitmapData()->m_isDIB )
1344 {
1345 wxDIB *dib = GetBitmapData()->m_dib;
1346 GetBitmapData()->m_dib = NULL;
1347
1348 // TODO: convert
1349
1350 delete dib;
1351 }
1352 #endif // wxUSE_WXDIB
1353 }
1354 #endif // wxHAS_RAW_BITMAP
1355
1356 // ----------------------------------------------------------------------------
1357 // wxMask
1358 // ----------------------------------------------------------------------------
1359
1360 wxMask::wxMask()
1361 {
1362 m_maskBitmap = 0;
1363 }
1364
1365 // Copy constructor
1366 wxMask::wxMask(const wxMask &mask)
1367 : wxObject()
1368 {
1369 BITMAP bmp;
1370
1371 HDC srcDC = CreateCompatibleDC(0);
1372 HDC destDC = CreateCompatibleDC(0);
1373
1374 // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1375 // so we'll use GetObject() API here:
1376 if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1377 {
1378 wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1379 return;
1380 }
1381
1382 // create our HBITMAP
1383 int w = bmp.bmWidth, h = bmp.bmHeight;
1384 m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1385
1386 // copy the mask's HBITMAP into our HBITMAP
1387 SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1388 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1389
1390 BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1391
1392 SelectObject(srcDC, 0);
1393 DeleteDC(srcDC);
1394 SelectObject(destDC, 0);
1395 DeleteDC(destDC);
1396 }
1397
1398 // Construct a mask from a bitmap and a colour indicating
1399 // the transparent area
1400 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1401 {
1402 m_maskBitmap = 0;
1403 Create(bitmap, colour);
1404 }
1405
1406 // Construct a mask from a bitmap and a palette index indicating
1407 // the transparent area
1408 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1409 {
1410 m_maskBitmap = 0;
1411 Create(bitmap, paletteIndex);
1412 }
1413
1414 // Construct a mask from a mono bitmap (copies the bitmap).
1415 wxMask::wxMask(const wxBitmap& bitmap)
1416 {
1417 m_maskBitmap = 0;
1418 Create(bitmap);
1419 }
1420
1421 wxMask::~wxMask()
1422 {
1423 if ( m_maskBitmap )
1424 ::DeleteObject((HBITMAP) m_maskBitmap);
1425 }
1426
1427 // Create a mask from a mono bitmap (copies the bitmap).
1428 bool wxMask::Create(const wxBitmap& bitmap)
1429 {
1430 #ifndef __WXMICROWIN__
1431 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1432 _T("can't create mask from invalid or not monochrome bitmap") );
1433
1434 if ( m_maskBitmap )
1435 {
1436 ::DeleteObject((HBITMAP) m_maskBitmap);
1437 m_maskBitmap = 0;
1438 }
1439
1440 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1441 bitmap.GetWidth(),
1442 bitmap.GetHeight(),
1443 1, 1, 0
1444 );
1445 HDC srcDC = CreateCompatibleDC(0);
1446 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1447 HDC destDC = CreateCompatibleDC(0);
1448 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1449 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1450 SelectObject(srcDC, 0);
1451 DeleteDC(srcDC);
1452 SelectObject(destDC, 0);
1453 DeleteDC(destDC);
1454 return true;
1455 #else
1456 wxUnusedVar(bitmap);
1457 return false;
1458 #endif
1459 }
1460
1461 // Create a mask from a bitmap and a palette index indicating
1462 // the transparent area
1463 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1464 {
1465 if ( m_maskBitmap )
1466 {
1467 ::DeleteObject((HBITMAP) m_maskBitmap);
1468 m_maskBitmap = 0;
1469 }
1470
1471 #if wxUSE_PALETTE
1472 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1473 {
1474 unsigned char red, green, blue;
1475 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1476 {
1477 wxColour transparentColour(red, green, blue);
1478 return Create(bitmap, transparentColour);
1479 }
1480 }
1481 #endif // wxUSE_PALETTE
1482
1483 return false;
1484 }
1485
1486 // Create a mask from a bitmap and a colour indicating
1487 // the transparent area
1488 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1489 {
1490 #ifndef __WXMICROWIN__
1491 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1492
1493 if ( m_maskBitmap )
1494 {
1495 ::DeleteObject((HBITMAP) m_maskBitmap);
1496 m_maskBitmap = 0;
1497 }
1498
1499 int width = bitmap.GetWidth(),
1500 height = bitmap.GetHeight();
1501
1502 // scan the bitmap for the transparent colour and set the corresponding
1503 // pixels in the mask to BLACK and the rest to WHITE
1504 COLORREF maskColour = wxColourToPalRGB(colour);
1505 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1506
1507 HDC srcDC = ::CreateCompatibleDC(NULL);
1508 HDC destDC = ::CreateCompatibleDC(NULL);
1509 if ( !srcDC || !destDC )
1510 {
1511 wxLogLastError(wxT("CreateCompatibleDC"));
1512 }
1513
1514 bool ok = true;
1515
1516 // SelectObject() will fail
1517 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1518 _T("bitmap can't be selected in another DC") );
1519
1520 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1521 if ( !hbmpSrcOld )
1522 {
1523 wxLogLastError(wxT("SelectObject"));
1524
1525 ok = false;
1526 }
1527
1528 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1529 if ( !hbmpDstOld )
1530 {
1531 wxLogLastError(wxT("SelectObject"));
1532
1533 ok = false;
1534 }
1535
1536 if ( ok )
1537 {
1538 // this will create a monochrome bitmap with 0 points for the pixels
1539 // which have the same value as the background colour and 1 for the
1540 // others
1541 ::SetBkColor(srcDC, maskColour);
1542 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1543 }
1544
1545 ::SelectObject(srcDC, hbmpSrcOld);
1546 ::DeleteDC(srcDC);
1547 ::SelectObject(destDC, hbmpDstOld);
1548 ::DeleteDC(destDC);
1549
1550 return ok;
1551 #else // __WXMICROWIN__
1552 wxUnusedVar(bitmap);
1553 wxUnusedVar(colour);
1554 return false;
1555 #endif // __WXMICROWIN__/!__WXMICROWIN__
1556 }
1557
1558 // ----------------------------------------------------------------------------
1559 // wxBitmapHandler
1560 // ----------------------------------------------------------------------------
1561
1562 bool wxBitmapHandler::Create(wxGDIImage *image,
1563 const void* data,
1564 wxBitmapType type,
1565 int width, int height, int depth)
1566 {
1567 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1568
1569 return bitmap && Create(bitmap, data, type, width, height, depth);
1570 }
1571
1572 bool wxBitmapHandler::Load(wxGDIImage *image,
1573 const wxString& name,
1574 wxBitmapType type,
1575 int width, int height)
1576 {
1577 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1578
1579 return bitmap && LoadFile(bitmap, name, type, width, height);
1580 }
1581
1582 bool wxBitmapHandler::Save(const wxGDIImage *image,
1583 const wxString& name,
1584 wxBitmapType type) const
1585 {
1586 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1587
1588 return bitmap && SaveFile(bitmap, name, type);
1589 }
1590
1591 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1592 const void* WXUNUSED(data),
1593 wxBitmapType WXUNUSED(type),
1594 int WXUNUSED(width),
1595 int WXUNUSED(height),
1596 int WXUNUSED(depth))
1597 {
1598 return false;
1599 }
1600
1601 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1602 const wxString& WXUNUSED(name),
1603 wxBitmapType WXUNUSED(type),
1604 int WXUNUSED(desiredWidth),
1605 int WXUNUSED(desiredHeight))
1606 {
1607 return false;
1608 }
1609
1610 bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap),
1611 const wxString& WXUNUSED(name),
1612 wxBitmapType WXUNUSED(type),
1613 const wxPalette *WXUNUSED(palette)) const
1614 {
1615 return false;
1616 }
1617
1618 // ----------------------------------------------------------------------------
1619 // global helper functions implemented here
1620 // ----------------------------------------------------------------------------
1621
1622 // helper of wxBitmapToHICON/HCURSOR
1623 static
1624 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1625 bool iconWanted,
1626 int hotSpotX,
1627 int hotSpotY)
1628 {
1629 if ( !bmp.Ok() )
1630 {
1631 // we can't create an icon/cursor form nothing
1632 return 0;
1633 }
1634
1635 if ( bmp.HasAlpha() )
1636 {
1637 // Create an empty mask bitmap.
1638 // it doesn't seem to work if we mess with the mask at all.
1639 HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1640
1641 ICONINFO iconInfo;
1642 wxZeroMemory(iconInfo);
1643 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1644 if ( !iconWanted )
1645 {
1646 iconInfo.xHotspot = hotSpotX;
1647 iconInfo.yHotspot = hotSpotY;
1648 }
1649
1650 iconInfo.hbmMask = hMonoBitmap;
1651 iconInfo.hbmColor = GetHbitmapOf(bmp);
1652
1653 HICON hicon = ::CreateIconIndirect(&iconInfo);
1654
1655 ::DeleteObject(hMonoBitmap);
1656
1657 return hicon;
1658 }
1659
1660 wxMask* mask = bmp.GetMask();
1661
1662 if ( !mask )
1663 {
1664 // we must have a mask for an icon, so even if it's probably incorrect,
1665 // do create it (grey is the "standard" transparent colour)
1666 mask = new wxMask(bmp, *wxLIGHT_GREY);
1667 }
1668
1669 ICONINFO iconInfo;
1670 wxZeroMemory(iconInfo);
1671 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1672 if ( !iconWanted )
1673 {
1674 iconInfo.xHotspot = hotSpotX;
1675 iconInfo.yHotspot = hotSpotY;
1676 }
1677
1678 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1679 iconInfo.hbmColor = GetHbitmapOf(bmp);
1680
1681 // black out the transparent area to preserve background colour, because
1682 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1683 // the mask to the dest rect.
1684 {
1685 MemoryHDC dcSrc, dcDst;
1686 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1687 selectBitmap(dcDst, iconInfo.hbmColor);
1688
1689 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1690 dcSrc, 0, 0, SRCAND) )
1691 {
1692 wxLogLastError(_T("BitBlt"));
1693 }
1694 }
1695
1696 HICON hicon = ::CreateIconIndirect(&iconInfo);
1697
1698 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1699 {
1700 // we created the mask, now delete it
1701 delete mask;
1702 }
1703
1704 // delete the inverted mask bitmap we created as well
1705 ::DeleteObject(iconInfo.hbmMask);
1706
1707 return hicon;
1708 }
1709
1710 HICON wxBitmapToHICON(const wxBitmap& bmp)
1711 {
1712 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1713 }
1714
1715 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1716 {
1717 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1718 }
1719
1720 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1721 {
1722 #ifndef __WXMICROWIN__
1723 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1724
1725 // get width/height from the bitmap if not given
1726 if ( !w || !h )
1727 {
1728 BITMAP bm;
1729 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1730 w = bm.bmWidth;
1731 h = bm.bmHeight;
1732 }
1733
1734 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1735 HDC hdcDst = ::CreateCompatibleDC(NULL);
1736 if ( !hdcSrc || !hdcDst )
1737 {
1738 wxLogLastError(wxT("CreateCompatibleDC"));
1739 }
1740
1741 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1742 if ( !hbmpInvMask )
1743 {
1744 wxLogLastError(wxT("CreateBitmap"));
1745 }
1746
1747 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1748 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1749 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1750 hdcSrc, 0, 0,
1751 NOTSRCCOPY) )
1752 {
1753 wxLogLastError(wxT("BitBlt"));
1754 }
1755
1756 // Deselect objects
1757 SelectObject(hdcSrc,srcTmp);
1758 SelectObject(hdcDst,dstTmp);
1759
1760 ::DeleteDC(hdcSrc);
1761 ::DeleteDC(hdcDst);
1762
1763 return hbmpInvMask;
1764 #else
1765 return 0;
1766 #endif
1767 }
wxWidgets (Impactor)