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[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
44 #if wxUSE_WXDIB
45 #include "wx/msw/dib.h"
46 #endif
47
48 #ifdef wxHAVE_RAW_BITMAP
49 #include "wx/rawbmp.h"
50 #endif
51
52 // missing from mingw32 header
53 #ifndef CLR_INVALID
54 #define CLR_INVALID ((COLORREF)-1)
55 #endif // no CLR_INVALID
56
57 // ----------------------------------------------------------------------------
58 // Bitmap data
59 // ----------------------------------------------------------------------------
60
61 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
62 {
63 public:
64 wxBitmapRefData();
65 wxBitmapRefData(const wxBitmapRefData& data);
66 virtual ~wxBitmapRefData() { Free(); }
67
68 virtual void Free();
69
70 // set the mask object to use as the mask, we take ownership of it
71 void SetMask(wxMask *mask)
72 {
73 delete m_bitmapMask;
74 m_bitmapMask = mask;
75 }
76
77 // set the HBITMAP to use as the mask
78 void SetMask(HBITMAP hbmpMask)
79 {
80 SetMask(new wxMask((WXHBITMAP)hbmpMask));
81 }
82
83 // return the mask
84 wxMask *GetMask() const { return m_bitmapMask; }
85
86 public:
87 #if wxUSE_PALETTE
88 wxPalette m_bitmapPalette;
89 #endif // wxUSE_PALETTE
90
91 // MSW-specific
92 // ------------
93
94 #ifdef __WXDEBUG__
95 // this field is solely for error checking: we detect selecting a bitmap
96 // into more than one DC at once or deleting a bitmap still selected into a
97 // DC (both are serious programming errors under Windows)
98 wxDC *m_selectedInto;
99 #endif // __WXDEBUG__
100
101 #if wxUSE_WXDIB
102 // when GetRawData() is called for a DDB we need to convert it to a DIB
103 // first to be able to provide direct access to it and we cache that DIB
104 // here and convert it back to DDB when UngetRawData() is called
105 wxDIB *m_dib;
106 #endif
107
108 // true if we have alpha transparency info and can be drawn using
109 // AlphaBlend()
110 bool m_hasAlpha;
111
112 // true if our HBITMAP is a DIB section, false if it is a DDB
113 bool m_isDIB;
114
115 private:
116 // optional mask for transparent drawing
117 wxMask *m_bitmapMask;
118
119
120 // not implemented
121 wxBitmapRefData& operator=(const wxBitmapRefData&);
122 };
123
124 // ----------------------------------------------------------------------------
125 // macros
126 // ----------------------------------------------------------------------------
127
128 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
129 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
130
131 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
132
133 // ============================================================================
134 // implementation
135 // ============================================================================
136
137 // ----------------------------------------------------------------------------
138 // helper functions
139 // ----------------------------------------------------------------------------
140
141 // decide whether we should create a DIB or a DDB for the given parameters
142 //
143 // NB: we always use DIBs under Windows CE as this is much simpler (even if
144 // also less efficient...) and we obviously can't use them if there is no
145 // DIB support compiled in at all
146 #ifdef __WXWINCE__
147 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
148
149 #define ALWAYS_USE_DIB
150 #elif !wxUSE_WXDIB
151 // no sense in defining wxShouldCreateDIB() as we can't compile code
152 // executed if it is true, so we have to use #if's anyhow
153 #define NEVER_USE_DIB
154 #else // wxUSE_WXDIB && !__WXWINCE__
155 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
156 {
157 // here is the logic:
158 //
159 // (a) if hdc is specified, the caller explicitly wants DDB
160 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
161 // or less DIBs anyhow)
162 // (c) finally, create DIBs under Win9x even if the depth hasn't been
163 // explicitly specified but the current display depth is 24 or
164 // more and the image is "big", i.e. > 16Mb which is the
165 // theoretical limit for DDBs under Win9x
166 //
167 // consequences (all of which seem to make sense):
168 //
169 // (i) by default, DDBs are created (depth == -1 usually)
170 // (ii) DIBs can be created by explicitly specifying the depth
171 // (iii) using a DC always forces creating a DDB
172 return !hdc &&
173 (d >= 24 ||
174 (d == -1 &&
175 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
176 }
177
178 #define SOMETIMES_USE_DIB
179 #endif // different DIB usage scenarious
180
181 // ----------------------------------------------------------------------------
182 // wxBitmapRefData
183 // ----------------------------------------------------------------------------
184
185 wxBitmapRefData::wxBitmapRefData()
186 {
187 #ifdef __WXDEBUG__
188 m_selectedInto = NULL;
189 #endif
190 m_bitmapMask = NULL;
191
192 m_hBitmap = (WXHBITMAP) NULL;
193 #if wxUSE_WXDIB
194 m_dib = NULL;
195 #endif
196
197 m_isDIB =
198 m_hasAlpha = false;
199 }
200
201 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
202 : wxGDIImageRefData(data)
203 {
204 #ifdef __WXDEBUG__
205 m_selectedInto = NULL;
206 #endif
207
208 // (deep) copy the mask if present
209 m_bitmapMask = NULL;
210 if (data.m_bitmapMask)
211 m_bitmapMask = new wxMask(*data.m_bitmapMask);
212
213 // FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
214 // CloneRefData()
215
216 wxASSERT_MSG( !data.m_isDIB,
217 _T("can't copy bitmap locked for raw access!") );
218 m_isDIB = false;
219
220 m_hasAlpha = data.m_hasAlpha;
221 }
222
223 void wxBitmapRefData::Free()
224 {
225 wxASSERT_MSG( !m_selectedInto,
226 wxT("deleting bitmap still selected into wxMemoryDC") );
227
228 #if wxUSE_WXDIB
229 wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
230 #endif
231
232 if ( m_hBitmap)
233 {
234 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
235 {
236 wxLogLastError(wxT("DeleteObject(hbitmap)"));
237 }
238 }
239
240 delete m_bitmapMask;
241 m_bitmapMask = NULL;
242 }
243
244 // ----------------------------------------------------------------------------
245 // wxBitmap creation
246 // ----------------------------------------------------------------------------
247
248 wxGDIImageRefData *wxBitmap::CreateData() const
249 {
250 return new wxBitmapRefData;
251 }
252
253 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
254 {
255 const wxBitmapRefData *
256 data = wx_static_cast(const wxBitmapRefData *, dataOrig);
257 if ( !data )
258 return NULL;
259
260 // FIXME: this method is backwards, it should just create a new
261 // wxBitmapRefData using its copy ctor but instead it modifies this
262 // bitmap itself and then returns its m_refData -- which works, of
263 // course (except in !wxUSE_WXDIB), but is completely illogical
264 wxBitmap *self = wx_const_cast(wxBitmap *, this);
265
266 #if wxUSE_WXDIB
267 // copy the other bitmap
268 if ( data->m_hBitmap )
269 {
270 wxDIB dib((HBITMAP)(data->m_hBitmap));
271 self->CopyFromDIB(dib);
272 }
273 else
274 #endif // wxUSE_WXDIB
275 {
276 // copy the bitmap data
277 self->m_refData = new wxBitmapRefData(*data);
278 }
279
280 // copy also the mask
281 wxMask * const maskSrc = data->GetMask();
282 if ( maskSrc )
283 {
284 wxBitmapRefData *selfdata = wx_static_cast(wxBitmapRefData *, m_refData);
285
286 selfdata->SetMask(new wxMask(*maskSrc));
287 }
288
289 return m_refData;
290 }
291
292 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
293 wxBitmapTransparency transp)
294 {
295 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
296 // it may be either HICON or HCURSOR
297 HICON hicon = (HICON)icon.GetHandle();
298
299 ICONINFO iconInfo;
300 if ( !::GetIconInfo(hicon, &iconInfo) )
301 {
302 wxLogLastError(wxT("GetIconInfo"));
303
304 return false;
305 }
306
307 wxBitmapRefData *refData = new wxBitmapRefData;
308 m_refData = refData;
309
310 int w = icon.GetWidth(),
311 h = icon.GetHeight();
312
313 refData->m_width = w;
314 refData->m_height = h;
315 refData->m_depth = wxDisplayDepth();
316
317 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
318
319 switch ( transp )
320 {
321 default:
322 wxFAIL_MSG( _T("unknown wxBitmapTransparency value") );
323
324 case wxBitmapTransparency_None:
325 // nothing to do, refData->m_hasAlpha is false by default
326 break;
327
328 case wxBitmapTransparency_Auto:
329 #if wxUSE_WXDIB
330 // If the icon is 32 bits per pixel then it may have alpha channel
331 // data, although there are some icons that are 32 bpp but have no
332 // alpha... So convert to a DIB and manually check the 4th byte for
333 // each pixel.
334 {
335 BITMAP bm;
336 if ( ::GetObject(iconInfo.hbmColor, sizeof(bm), &bm) &&
337 (bm.bmBitsPixel == 32) )
338 {
339 wxDIB dib(iconInfo.hbmColor);
340 if (dib.IsOk())
341 {
342 const unsigned char* pixels = dib.GetData();
343 for (int idx = 0; idx < w*h*4; idx+=4)
344 {
345 if (pixels[idx+3] != 0)
346 {
347 // If there is an alpha byte that is non-zero
348 // then set the alpha flag and stop checking
349 refData->m_hasAlpha = true;
350 break;
351 }
352 }
353 }
354 }
355 }
356 break;
357 #endif // wxUSE_WXDIB
358
359 case wxBitmapTransparency_Always:
360 refData->m_hasAlpha = true;
361 break;
362 }
363
364 if ( !refData->m_hasAlpha )
365 {
366 // the mask returned by GetIconInfo() is inverted compared to the usual
367 // wxWin convention
368 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
369 }
370
371 // delete the old one now as we don't need it any more
372 ::DeleteObject(iconInfo.hbmMask);
373
374 return true;
375 #else // __WXMICROWIN__ || __WXWINCE__
376 wxUnusedVar(icon);
377 wxUnusedVar(transp);
378
379 return false;
380 #endif // !__WXWINCE__/__WXWINCE__
381 }
382
383 bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp)
384 {
385 UnRef();
386
387 if ( !cursor.Ok() )
388 return false;
389
390 return CopyFromIconOrCursor(cursor, transp);
391 }
392
393 bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp)
394 {
395 UnRef();
396
397 if ( !icon.Ok() )
398 return false;
399
400 return CopyFromIconOrCursor(icon, transp);
401 }
402
403 #ifndef NEVER_USE_DIB
404
405 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
406 {
407 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
408
409 #ifdef SOMETIMES_USE_DIB
410 HBITMAP hbitmap = dib.CreateDDB();
411 if ( !hbitmap )
412 return false;
413 #else // ALWAYS_USE_DIB
414 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
415 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
416
417 UnRef();
418
419 wxBitmapRefData *refData = new wxBitmapRefData;
420 m_refData = refData;
421
422 refData->m_width = dib.GetWidth();
423 refData->m_height = dib.GetHeight();
424 refData->m_depth = dib.GetDepth();
425
426 refData->m_hBitmap = (WXHBITMAP)hbitmap;
427
428 #if wxUSE_PALETTE
429 wxPalette *palette = dib.CreatePalette();
430 if ( palette )
431 {
432 refData->m_bitmapPalette = *palette;
433 }
434
435 delete palette;
436 #endif // wxUSE_PALETTE
437
438 return true;
439 }
440
441 #endif // NEVER_USE_DIB
442
443 wxBitmap::~wxBitmap()
444 {
445 }
446
447 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
448 {
449 #ifndef __WXMICROWIN__
450 wxBitmapRefData *refData = new wxBitmapRefData;
451 m_refData = refData;
452
453 refData->m_width = width;
454 refData->m_height = height;
455 refData->m_depth = depth;
456
457 char *data;
458 if ( depth == 1 )
459 {
460 // we assume that it is in XBM format which is not quite the same as
461 // the format CreateBitmap() wants because the order of bytes in the
462 // line is reversed!
463 const size_t bytesPerLine = (width + 7) / 8;
464 const size_t padding = bytesPerLine % 2;
465 const size_t len = height * ( padding + bytesPerLine );
466 data = (char *)malloc(len);
467 const char *src = bits;
468 char *dst = data;
469
470 for ( int rows = 0; rows < height; rows++ )
471 {
472 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
473 {
474 unsigned char val = *src++;
475 unsigned char reversed = 0;
476
477 for ( int bits = 0; bits < 8; bits++)
478 {
479 reversed <<= 1;
480 reversed |= (unsigned char)(val & 0x01);
481 val >>= 1;
482 }
483 *dst++ = ~reversed;
484 }
485
486 if ( padding )
487 *dst++ = 0;
488 }
489 }
490 else
491 {
492 // bits should already be in Windows standard format
493 data = (char *)bits; // const_cast is harmless
494 }
495
496 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
497 if ( !hbmp )
498 {
499 wxLogLastError(wxT("CreateBitmap"));
500 }
501
502 if ( data != bits )
503 {
504 free(data);
505 }
506
507 SetHBITMAP((WXHBITMAP)hbmp);
508 #endif
509 }
510
511 wxBitmap::wxBitmap(int w, int h, int d)
512 {
513 (void)Create(w, h, d);
514 }
515
516 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
517 {
518 (void)Create(w, h, dc);
519 }
520
521 wxBitmap::wxBitmap(const void* data, long type, int width, int height, int depth)
522 {
523 (void)Create(data, type, width, height, depth);
524 }
525
526 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
527 {
528 LoadFile(filename, (int)type);
529 }
530
531 bool wxBitmap::Create(int width, int height, int depth)
532 {
533 return DoCreate(width, height, depth, 0);
534 }
535
536 bool wxBitmap::Create(int width, int height, const wxDC& dc)
537 {
538 wxCHECK_MSG( dc.IsOk(), false, _T("invalid HDC in wxBitmap::Create()") );
539
540 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
541
542 if (impl)
543 return DoCreate(width, height, -1, impl->GetHDC());
544 else
545 return false;
546 }
547
548 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
549 {
550 UnRef();
551
552 m_refData = new wxBitmapRefData;
553
554 GetBitmapData()->m_width = w;
555 GetBitmapData()->m_height = h;
556
557 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
558
559 #ifndef NEVER_USE_DIB
560 if ( wxShouldCreateDIB(w, h, d, hdc) )
561 {
562 if ( d == -1 )
563 {
564 // create DIBs without alpha channel by default
565 d = 24;
566 }
567
568 wxDIB dib(w, h, d);
569 if ( !dib.IsOk() )
570 return false;
571
572 // don't delete the DIB section in dib object dtor
573 hbmp = dib.Detach();
574
575 GetBitmapData()->m_isDIB = true;
576 GetBitmapData()->m_depth = d;
577 }
578 else // create a DDB
579 #endif // NEVER_USE_DIB
580 {
581 #ifndef ALWAYS_USE_DIB
582 #ifndef __WXMICROWIN__
583 if ( d > 0 )
584 {
585 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
586 if ( !hbmp )
587 {
588 wxLogLastError(wxT("CreateBitmap"));
589 }
590
591 GetBitmapData()->m_depth = d;
592 }
593 else // d == 0, create bitmap compatible with the screen
594 #endif // !__WXMICROWIN__
595 {
596 ScreenHDC dc;
597 hbmp = ::CreateCompatibleBitmap(dc, w, h);
598 if ( !hbmp )
599 {
600 wxLogLastError(wxT("CreateCompatibleBitmap"));
601 }
602
603 GetBitmapData()->m_depth = wxDisplayDepth();
604 }
605 #endif // !ALWAYS_USE_DIB
606 }
607
608 SetHBITMAP((WXHBITMAP)hbmp);
609
610 return Ok();
611 }
612
613 #if wxUSE_IMAGE
614
615 // ----------------------------------------------------------------------------
616 // wxImage to/from conversions for Microwin
617 // ----------------------------------------------------------------------------
618
619 // Microwin versions are so different from normal ones that it really doesn't
620 // make sense to use #ifdefs inside the function bodies
621 #ifdef __WXMICROWIN__
622
623 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
624 {
625 // Set this to 1 to experiment with mask code,
626 // which currently doesn't work
627 #define USE_MASKS 0
628
629 m_refData = new wxBitmapRefData();
630
631 // Initial attempt at a simple-minded implementation.
632 // The bitmap will always be created at the screen depth,
633 // so the 'depth' argument is ignored.
634
635 HDC hScreenDC = ::GetDC(NULL);
636 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
637
638 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
639 HBITMAP hMaskBitmap = NULL;
640 HBITMAP hOldMaskBitmap = NULL;
641 HDC hMaskDC = NULL;
642 unsigned char maskR = 0;
643 unsigned char maskG = 0;
644 unsigned char maskB = 0;
645
646 // printf("Created bitmap %d\n", (int) hBitmap);
647 if (hBitmap == NULL)
648 {
649 ::ReleaseDC(NULL, hScreenDC);
650 return false;
651 }
652 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
653
654 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
655 ::ReleaseDC(NULL, hScreenDC);
656
657 // created an mono-bitmap for the possible mask
658 bool hasMask = image.HasMask();
659
660 if ( hasMask )
661 {
662 #if USE_MASKS
663 // FIXME: we should be able to pass bpp = 1, but
664 // GdBlit can't handle a different depth
665 #if 0
666 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
667 #else
668 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
669 #endif
670 maskR = image.GetMaskRed();
671 maskG = image.GetMaskGreen();
672 maskB = image.GetMaskBlue();
673
674 if (!hMaskBitmap)
675 {
676 hasMask = false;
677 }
678 else
679 {
680 hScreenDC = ::GetDC(NULL);
681 hMaskDC = ::CreateCompatibleDC(hScreenDC);
682 ::ReleaseDC(NULL, hScreenDC);
683
684 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
685 }
686 #else
687 hasMask = false;
688 #endif
689 }
690
691 int i, j;
692 for (i = 0; i < image.GetWidth(); i++)
693 {
694 for (j = 0; j < image.GetHeight(); j++)
695 {
696 unsigned char red = image.GetRed(i, j);
697 unsigned char green = image.GetGreen(i, j);
698 unsigned char blue = image.GetBlue(i, j);
699
700 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
701
702 if (hasMask)
703 {
704 // scan the bitmap for the transparent colour and set the corresponding
705 // pixels in the mask to BLACK and the rest to WHITE
706 if (maskR == red && maskG == green && maskB == blue)
707 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
708 else
709 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
710 }
711 }
712 }
713
714 ::SelectObject(hMemDC, hOldBitmap);
715 ::DeleteDC(hMemDC);
716 if (hasMask)
717 {
718 ::SelectObject(hMaskDC, hOldMaskBitmap);
719 ::DeleteDC(hMaskDC);
720
721 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
722 }
723
724 SetWidth(image.GetWidth());
725 SetHeight(image.GetHeight());
726 SetDepth(screenDepth);
727 SetHBITMAP( (WXHBITMAP) hBitmap );
728
729 #if wxUSE_PALETTE
730 // Copy the palette from the source image
731 SetPalette(image.GetPalette());
732 #endif // wxUSE_PALETTE
733
734 return true;
735 }
736
737 wxImage wxBitmap::ConvertToImage() const
738 {
739 // Initial attempt at a simple-minded implementation.
740 // The bitmap will always be created at the screen depth,
741 // so the 'depth' argument is ignored.
742 // TODO: transparency (create a mask image)
743
744 if (!Ok())
745 {
746 wxFAIL_MSG( wxT("bitmap is invalid") );
747 return wxNullImage;
748 }
749
750 wxImage image;
751
752 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
753
754 // create an wxImage object
755 int width = GetWidth();
756 int height = GetHeight();
757 image.Create( width, height );
758 unsigned char *data = image.GetData();
759 if( !data )
760 {
761 wxFAIL_MSG( wxT("could not allocate data for image") );
762 return wxNullImage;
763 }
764
765 HDC hScreenDC = ::GetDC(NULL);
766
767 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
768 ::ReleaseDC(NULL, hScreenDC);
769
770 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
771
772 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
773
774 int i, j;
775 for (i = 0; i < GetWidth(); i++)
776 {
777 for (j = 0; j < GetHeight(); j++)
778 {
779 COLORREF color = ::GetPixel(hMemDC, i, j);
780 unsigned char red = GetRValue(color);
781 unsigned char green = GetGValue(color);
782 unsigned char blue = GetBValue(color);
783
784 image.SetRGB(i, j, red, green, blue);
785 }
786 }
787
788 ::SelectObject(hMemDC, hOldBitmap);
789 ::DeleteDC(hMemDC);
790
791 #if wxUSE_PALETTE
792 // Copy the palette from the source image
793 if (GetPalette())
794 image.SetPalette(* GetPalette());
795 #endif // wxUSE_PALETTE
796
797 return image;
798 }
799
800 #endif // __WXMICROWIN__
801
802 // ----------------------------------------------------------------------------
803 // wxImage to/from conversions
804 // ----------------------------------------------------------------------------
805
806 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
807 {
808 return CreateFromImage(image, depth, 0);
809 }
810
811 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
812 {
813 wxCHECK_MSG( dc.IsOk(), false,
814 _T("invalid HDC in wxBitmap::CreateFromImage()") );
815
816 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
817
818 if (impl)
819 return CreateFromImage(image, -1, impl->GetHDC());
820 else
821 return false;
822 }
823
824 #if wxUSE_WXDIB
825
826 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
827 {
828 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
829
830 UnRef();
831
832 // first convert the image to DIB
833 const int h = image.GetHeight();
834 const int w = image.GetWidth();
835
836 wxDIB dib(image);
837 if ( !dib.IsOk() )
838 return false;
839
840 if ( depth == -1 )
841 depth = dib.GetDepth(); // Get depth from image if none specified
842
843 // store the bitmap parameters
844 wxBitmapRefData *refData = new wxBitmapRefData;
845 refData->m_width = w;
846 refData->m_height = h;
847 refData->m_hasAlpha = image.HasAlpha();
848
849 m_refData = refData;
850
851
852 // next either store DIB as is or create a DDB from it
853 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
854
855 // are we going to use DIB?
856 //
857 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
858 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
859 {
860 // don't delete the DIB section in dib object dtor
861 hbitmap = dib.Detach();
862
863 refData->m_isDIB = true;
864 refData->m_depth = depth;
865 }
866 #ifndef ALWAYS_USE_DIB
867 else // we need to convert DIB to DDB
868 {
869 hbitmap = dib.CreateDDB((HDC)hdc);
870
871 refData->m_depth = depth;
872 }
873 #endif // !ALWAYS_USE_DIB
874
875 // validate this object
876 SetHBITMAP((WXHBITMAP)hbitmap);
877
878 // finally also set the mask if we have one
879 if ( image.HasMask() )
880 {
881 const size_t len = 2*((w+15)/16);
882 BYTE *src = image.GetData();
883 BYTE *data = new BYTE[h*len];
884 memset(data, 0, h*len);
885 BYTE r = image.GetMaskRed(),
886 g = image.GetMaskGreen(),
887 b = image.GetMaskBlue();
888 BYTE *dst = data;
889 for ( int y = 0; y < h; y++, dst += len )
890 {
891 BYTE *dstLine = dst;
892 BYTE mask = 0x80;
893 for ( int x = 0; x < w; x++, src += 3 )
894 {
895 if (src[0] != r || src[1] != g || src[2] != b)
896 *dstLine |= mask;
897
898 if ( (mask >>= 1) == 0 )
899 {
900 dstLine++;
901 mask = 0x80;
902 }
903 }
904 }
905
906 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
907 if ( !hbitmap )
908 {
909 wxLogLastError(_T("CreateBitmap(mask)"));
910 }
911 else
912 {
913 SetMask(new wxMask((WXHBITMAP)hbitmap));
914 }
915
916 delete[] data;
917 }
918
919 return true;
920 }
921
922 wxImage wxBitmap::ConvertToImage() const
923 {
924 // convert DDB to DIB
925 wxDIB dib(*this);
926
927 if ( !dib.IsOk() )
928 {
929 return wxNullImage;
930 }
931
932 // and then DIB to our wxImage
933 wxImage image = dib.ConvertToImage();
934 if ( !image.Ok() )
935 {
936 return wxNullImage;
937 }
938
939 // now do the same for the mask, if we have any
940 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
941 if ( hbmpMask )
942 {
943 wxDIB dibMask(hbmpMask);
944 if ( dibMask.IsOk() )
945 {
946 // TODO: use wxRawBitmap to iterate over DIB
947
948 // we hard code the mask colour for now but we could also make an
949 // effort (and waste time) to choose a colour not present in the
950 // image already to avoid having to fudge the pixels below --
951 // whether it's worth to do it is unclear however
952 static const int MASK_RED = 1;
953 static const int MASK_GREEN = 2;
954 static const int MASK_BLUE = 3;
955 static const int MASK_BLUE_REPLACEMENT = 2;
956
957 const int h = dibMask.GetHeight();
958 const int w = dibMask.GetWidth();
959 const int bpp = dibMask.GetDepth();
960 const int maskBytesPerPixel = bpp >> 3;
961 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
962 unsigned char *data = image.GetData();
963
964 // remember that DIBs are stored in bottom to top order
965 unsigned char *
966 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
967
968 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
969 {
970 // traverse one mask DIB line
971 unsigned char *mask = maskLineStart;
972 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
973 {
974 // should this pixel be transparent?
975 if ( *mask )
976 {
977 // no, check that it isn't transparent by accident
978 if ( (data[0] == MASK_RED) &&
979 (data[1] == MASK_GREEN) &&
980 (data[2] == MASK_BLUE) )
981 {
982 // we have to fudge the colour a bit to prevent
983 // this pixel from appearing transparent
984 data[2] = MASK_BLUE_REPLACEMENT;
985 }
986
987 data += 3;
988 }
989 else // yes, transparent pixel
990 {
991 *data++ = MASK_RED;
992 *data++ = MASK_GREEN;
993 *data++ = MASK_BLUE;
994 }
995 }
996 }
997
998 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
999 }
1000 }
1001
1002 return image;
1003 }
1004
1005 #else // !wxUSE_WXDIB
1006
1007 bool
1008 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1009 int WXUNUSED(depth),
1010 WXHDC WXUNUSED(hdc))
1011 {
1012 return false;
1013 }
1014
1015 wxImage wxBitmap::ConvertToImage() const
1016 {
1017 return wxImage();
1018 }
1019
1020 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1021
1022 #endif // wxUSE_IMAGE
1023
1024 // ----------------------------------------------------------------------------
1025 // loading and saving bitmaps
1026 // ----------------------------------------------------------------------------
1027
1028 bool wxBitmap::LoadFile(const wxString& filename, long type)
1029 {
1030 UnRef();
1031
1032 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1033
1034 if ( handler )
1035 {
1036 m_refData = new wxBitmapRefData;
1037
1038 return handler->LoadFile(this, filename, type, -1, -1);
1039 }
1040 #if wxUSE_IMAGE && wxUSE_WXDIB
1041 else // no bitmap handler found
1042 {
1043 wxImage image;
1044 if ( image.LoadFile( filename, type ) && image.Ok() )
1045 {
1046 *this = wxBitmap(image);
1047
1048 return true;
1049 }
1050 }
1051 #endif // wxUSE_IMAGE
1052
1053 return false;
1054 }
1055
1056 bool wxBitmap::Create(const void* data, long type, int width, int height, int depth)
1057 {
1058 UnRef();
1059
1060 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1061
1062 if ( !handler )
1063 {
1064 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1065
1066 return false;
1067 }
1068
1069 m_refData = new wxBitmapRefData;
1070
1071 return handler->Create(this, data, type, width, height, depth);
1072 }
1073
1074 bool wxBitmap::SaveFile(const wxString& filename,
1075 int type,
1076 const wxPalette *palette)
1077 {
1078 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1079
1080 if ( handler )
1081 {
1082 return handler->SaveFile(this, filename, type, palette);
1083 }
1084 #if wxUSE_IMAGE && wxUSE_WXDIB
1085 else // no bitmap handler found
1086 {
1087 // FIXME what about palette? shouldn't we use it?
1088 wxImage image = ConvertToImage();
1089 if ( image.Ok() )
1090 {
1091 return image.SaveFile(filename, type);
1092 }
1093 }
1094 #endif // wxUSE_IMAGE
1095
1096 return false;
1097 }
1098
1099 // ----------------------------------------------------------------------------
1100 // sub bitmap extraction
1101 // ----------------------------------------------------------------------------
1102 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1103 {
1104 MemoryHDC dcSrc;
1105 SelectInHDC selectSrc(dcSrc, GetHbitmap());
1106 return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1107 }
1108
1109 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1110 {
1111 wxCHECK_MSG( Ok() &&
1112 (rect.x >= 0) && (rect.y >= 0) &&
1113 (rect.x+rect.width <= GetWidth()) &&
1114 (rect.y+rect.height <= GetHeight()),
1115 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1116
1117 wxBitmap ret( rect.width, rect.height, GetDepth() );
1118 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1119
1120 #ifndef __WXMICROWIN__
1121 // handle alpha channel, if any
1122 if (HasAlpha())
1123 ret.UseAlpha();
1124
1125 // copy bitmap data
1126 MemoryHDC dcSrc,
1127 dcDst;
1128
1129 {
1130 SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1131
1132 if ( !selectDst )
1133 {
1134 wxLogLastError(_T("SelectObject(destBitmap)"));
1135 }
1136
1137 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1138 (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1139 {
1140 wxLogLastError(_T("BitBlt"));
1141 }
1142 }
1143
1144 // copy mask if there is one
1145 if ( GetMask() )
1146 {
1147 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1148
1149 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1150 selectDst(dcDst, hbmpMask);
1151
1152 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1153 dcSrc, rect.x, rect.y, SRCCOPY) )
1154 {
1155 wxLogLastError(_T("BitBlt"));
1156 }
1157
1158 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1159 ret.SetMask(mask);
1160 }
1161 #endif // !__WXMICROWIN__
1162
1163 return ret;
1164 }
1165
1166 // ----------------------------------------------------------------------------
1167 // wxBitmap accessors
1168 // ----------------------------------------------------------------------------
1169
1170 #if wxUSE_PALETTE
1171 wxPalette* wxBitmap::GetPalette() const
1172 {
1173 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1174 : (wxPalette *) NULL;
1175 }
1176 #endif
1177
1178 wxMask *wxBitmap::GetMask() const
1179 {
1180 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1181 }
1182
1183 wxBitmap wxBitmap::GetMaskBitmap() const
1184 {
1185 wxBitmap bmp;
1186 wxMask *mask = GetMask();
1187 if ( mask )
1188 bmp.SetHBITMAP(mask->GetMaskBitmap());
1189 return bmp;
1190 }
1191
1192 #ifdef __WXDEBUG__
1193
1194 wxDC *wxBitmap::GetSelectedInto() const
1195 {
1196 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1197 }
1198
1199 #endif
1200
1201 void wxBitmap::UseAlpha()
1202 {
1203 if ( GetBitmapData() )
1204 GetBitmapData()->m_hasAlpha = true;
1205 }
1206
1207 bool wxBitmap::HasAlpha() const
1208 {
1209 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1210 }
1211
1212 // ----------------------------------------------------------------------------
1213 // wxBitmap setters
1214 // ----------------------------------------------------------------------------
1215
1216 #ifdef __WXDEBUG__
1217
1218 void wxBitmap::SetSelectedInto(wxDC *dc)
1219 {
1220 if ( GetBitmapData() )
1221 GetBitmapData()->m_selectedInto = dc;
1222 }
1223
1224 #endif
1225
1226 #if wxUSE_PALETTE
1227
1228 void wxBitmap::SetPalette(const wxPalette& palette)
1229 {
1230 AllocExclusive();
1231
1232 GetBitmapData()->m_bitmapPalette = palette;
1233 }
1234
1235 #endif // wxUSE_PALETTE
1236
1237 void wxBitmap::SetMask(wxMask *mask)
1238 {
1239 AllocExclusive();
1240
1241 GetBitmapData()->SetMask(mask);
1242 }
1243
1244 // ----------------------------------------------------------------------------
1245 // raw bitmap access support
1246 // ----------------------------------------------------------------------------
1247
1248 #ifdef wxHAVE_RAW_BITMAP
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 // #ifdef wxHAVE_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 long flags,
1565 int width, int height, int depth)
1566 {
1567 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1568
1569 return bitmap && Create(bitmap, data, flags, width, height, depth);
1570 }
1571
1572 bool wxBitmapHandler::Load(wxGDIImage *image,
1573 const wxString& name,
1574 long flags,
1575 int width, int height)
1576 {
1577 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1578
1579 return bitmap && LoadFile(bitmap, name, flags, width, height);
1580 }
1581
1582 bool wxBitmapHandler::Save(wxGDIImage *image,
1583 const wxString& name,
1584 int type)
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 long 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 long WXUNUSED(type),
1604 int WXUNUSED(desiredWidth),
1605 int WXUNUSED(desiredHeight))
1606 {
1607 return false;
1608 }
1609
1610 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1611 const wxString& WXUNUSED(name),
1612 int WXUNUSED(type),
1613 const wxPalette *WXUNUSED(palette))
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)