]> git.saurik.com Git - wxWidgets.git/blob - src/msw/bitmap.cpp
projects / wxWidgets.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Fix crash in wxDC::GetMultiLineTextExtent() after last commit.
[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/scopedptr.h"
43 #include "wx/msw/private.h"
44 #include "wx/msw/dc.h"
45
46 #if wxUSE_WXDIB
47 #include "wx/msw/dib.h"
48 #endif
49
50 #ifdef wxHAS_RAW_BITMAP
51 #include "wx/rawbmp.h"
52 #endif
53
54 // missing from mingw32 header
55 #ifndef CLR_INVALID
56 #define CLR_INVALID ((COLORREF)-1)
57 #endif // no CLR_INVALID
58
59 // ----------------------------------------------------------------------------
60 // wxBitmapRefData
61 // ----------------------------------------------------------------------------
62
63 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
64 {
65 public:
66 wxBitmapRefData() { Init(); }
67 wxBitmapRefData(const wxBitmapRefData& data);
68 virtual ~wxBitmapRefData() { Free(); }
69
70 virtual void Free();
71
72 void CopyFromDIB(const wxDIB& dib);
73
74 // set the mask object to use as the mask, we take ownership of it
75 void SetMask(wxMask *mask)
76 {
77 delete m_bitmapMask;
78 m_bitmapMask = mask;
79 }
80
81 // set the HBITMAP to use as the mask
82 void SetMask(HBITMAP hbmpMask)
83 {
84 SetMask(new wxMask((WXHBITMAP)hbmpMask));
85 }
86
87 // return the mask
88 wxMask *GetMask() const { return m_bitmapMask; }
89
90 public:
91 #if wxUSE_PALETTE
92 wxPalette m_bitmapPalette;
93 #endif // wxUSE_PALETTE
94
95 // MSW-specific
96 // ------------
97
98 #if wxDEBUG_LEVEL
99 // this field is solely for error checking: we detect selecting a bitmap
100 // into more than one DC at once or deleting a bitmap still selected into a
101 // DC (both are serious programming errors under Windows)
102 wxDC *m_selectedInto;
103 #endif // wxDEBUG_LEVEL
104
105 #if wxUSE_WXDIB
106 // when GetRawData() is called for a DDB we need to convert it to a DIB
107 // first to be able to provide direct access to it and we cache that DIB
108 // here and convert it back to DDB when UngetRawData() is called
109 wxDIB *m_dib;
110 #endif
111
112 // true if we have alpha transparency info and can be drawn using
113 // AlphaBlend()
114 bool m_hasAlpha;
115
116 // true if our HBITMAP is a DIB section, false if it is a DDB
117 bool m_isDIB;
118
119 private:
120 void Init();
121
122 // optional mask for transparent drawing
123 wxMask *m_bitmapMask;
124
125
126 // not implemented
127 wxBitmapRefData& operator=(const wxBitmapRefData&);
128 };
129
130 // ----------------------------------------------------------------------------
131 // macros
132 // ----------------------------------------------------------------------------
133
134 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
135 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
136
137 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
138
139 // ============================================================================
140 // implementation
141 // ============================================================================
142
143 // ----------------------------------------------------------------------------
144 // helper functions
145 // ----------------------------------------------------------------------------
146
147 // decide whether we should create a DIB or a DDB for the given parameters
148 //
149 // NB: we always use DIBs under Windows CE as this is much simpler (even if
150 // also less efficient...) and we obviously can't use them if there is no
151 // DIB support compiled in at all
152 #ifdef __WXWINCE__
153 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
154
155 #define ALWAYS_USE_DIB
156 #elif !wxUSE_WXDIB
157 // no sense in defining wxShouldCreateDIB() as we can't compile code
158 // executed if it is true, so we have to use #if's anyhow
159 #define NEVER_USE_DIB
160 #else // wxUSE_WXDIB && !__WXWINCE__
161 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
162 {
163 // here is the logic:
164 //
165 // (a) if hdc is specified, the caller explicitly wants DDB
166 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
167 // or less DIBs anyhow)
168 // (c) finally, create DIBs under Win9x even if the depth hasn't been
169 // explicitly specified but the current display depth is 24 or
170 // more and the image is "big", i.e. > 16Mb which is the
171 // theoretical limit for DDBs under Win9x
172 //
173 // consequences (all of which seem to make sense):
174 //
175 // (i) by default, DDBs are created (depth == -1 usually)
176 // (ii) DIBs can be created by explicitly specifying the depth
177 // (iii) using a DC always forces creating a DDB
178 return !hdc &&
179 (d >= 24 ||
180 (d == -1 &&
181 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
182 }
183
184 #define SOMETIMES_USE_DIB
185 #endif // different DIB usage scenarious
186
187 // ----------------------------------------------------------------------------
188 // wxBitmapRefData
189 // ----------------------------------------------------------------------------
190
191 void wxBitmapRefData::Init()
192 {
193 #if wxDEBUG_LEVEL
194 m_selectedInto = NULL;
195 #endif
196 m_bitmapMask = NULL;
197
198 m_hBitmap = (WXHBITMAP) NULL;
199 #if wxUSE_WXDIB
200 m_dib = NULL;
201 #endif
202
203 m_isDIB =
204 m_hasAlpha = false;
205 }
206
207 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
208 : wxGDIImageRefData(data)
209 {
210 Init();
211
212 // (deep) copy the mask if present
213 if (data.m_bitmapMask)
214 m_bitmapMask = new wxMask(*data.m_bitmapMask);
215
216 wxASSERT_MSG( !data.m_dib,
217 wxT("can't copy bitmap locked for raw access!") );
218
219 m_hasAlpha = data.m_hasAlpha;
220
221 #if wxUSE_WXDIB
222 // copy the other bitmap
223 if ( data.m_hBitmap )
224 {
225 wxDIB dib((HBITMAP)(data.m_hBitmap));
226 CopyFromDIB(dib);
227 }
228 #endif // wxUSE_WXDIB
229 }
230
231 void wxBitmapRefData::Free()
232 {
233 wxASSERT_MSG( !m_selectedInto,
234 wxT("deleting bitmap still selected into wxMemoryDC") );
235
236 #if wxUSE_WXDIB
237 wxASSERT_MSG( !m_dib, wxT("forgot to call wxBitmap::UngetRawData()!") );
238 #endif
239
240 if ( m_hBitmap)
241 {
242 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
243 {
244 wxLogLastError(wxT("DeleteObject(hbitmap)"));
245 }
246 }
247
248 wxDELETE(m_bitmapMask);
249 }
250
251 void wxBitmapRefData::CopyFromDIB(const wxDIB& dib)
252 {
253 wxCHECK_RET( !IsOk(), "bitmap already initialized" );
254 wxCHECK_RET( dib.IsOk(), wxT("invalid DIB in CopyFromDIB") );
255
256 #ifdef SOMETIMES_USE_DIB
257 HBITMAP hbitmap = dib.CreateDDB();
258 if ( !hbitmap )
259 return;
260 m_isDIB = false;
261 #else // ALWAYS_USE_DIB
262 HBITMAP hbitmap = const_cast<wxDIB &>(dib).Detach();
263 m_isDIB = true;
264 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
265
266 m_width = dib.GetWidth();
267 m_height = dib.GetHeight();
268 m_depth = dib.GetDepth();
269
270 m_hBitmap = (WXHBITMAP)hbitmap;
271
272 #if wxUSE_PALETTE
273 wxPalette *palette = dib.CreatePalette();
274 if ( palette )
275 m_bitmapPalette = *palette;
276 delete palette;
277 #endif // wxUSE_PALETTE
278 }
279
280 // ----------------------------------------------------------------------------
281 // wxBitmap creation
282 // ----------------------------------------------------------------------------
283
284 wxGDIImageRefData *wxBitmap::CreateData() const
285 {
286 return new wxBitmapRefData;
287 }
288
289 wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *data) const
290 {
291 return new wxBitmapRefData(*static_cast<const wxBitmapRefData *>(data));
292 }
293
294 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
295 wxBitmapTransparency transp)
296 {
297 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
298 // it may be either HICON or HCURSOR
299 HICON hicon = (HICON)icon.GetHandle();
300
301 ICONINFO iconInfo;
302 if ( !::GetIconInfo(hicon, &iconInfo) )
303 {
304 wxLogLastError(wxT("GetIconInfo"));
305
306 return false;
307 }
308
309 wxBitmapRefData *refData = new wxBitmapRefData;
310 m_refData = refData;
311
312 int w = icon.GetWidth(),
313 h = icon.GetHeight();
314
315 refData->m_width = w;
316 refData->m_height = h;
317 refData->m_depth = wxDisplayDepth();
318
319 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
320
321 switch ( transp )
322 {
323 default:
324 wxFAIL_MSG( wxT("unknown wxBitmapTransparency value") );
325
326 case wxBitmapTransparency_None:
327 // nothing to do, refData->m_hasAlpha is false by default
328 break;
329
330 case wxBitmapTransparency_Auto:
331 #if wxUSE_WXDIB
332 // If the icon is 32 bits per pixel then it may have alpha channel
333 // data, although there are some icons that are 32 bpp but have no
334 // alpha... So convert to a DIB and manually check the 4th byte for
335 // each pixel.
336 {
337 BITMAP bm;
338 if ( ::GetObject(iconInfo.hbmColor, sizeof(bm), &bm) &&
339 (bm.bmBitsPixel == 32) )
340 {
341 wxDIB dib(iconInfo.hbmColor);
342 if (dib.IsOk())
343 {
344 unsigned char* const pixels = dib.GetData();
345 int idx;
346 for ( idx = 0; idx < w*h*4; idx += 4 )
347 {
348 if (pixels[idx+3] != 0)
349 {
350 // If there is an alpha byte that is non-zero
351 // then set the alpha flag and stop checking
352 refData->m_hasAlpha = true;
353 break;
354 }
355 }
356
357 if ( refData->m_hasAlpha )
358 {
359 // If we do have alpha, ensure we use premultiplied
360 // data for our pixels as this is what the bitmaps
361 // created in other ways do and this is necessary
362 // for e.g. AlphaBlend() to work with this bitmap.
363 for ( idx = 0; idx < w*h*4; idx += 4 )
364 {
365 const unsigned char a = pixels[idx+3];
366
367 pixels[idx] = ((pixels[idx] *a) + 127)/255;
368 pixels[idx+1] = ((pixels[idx+1]*a) + 127)/255;
369 pixels[idx+2] = ((pixels[idx+2]*a) + 127)/255;
370 }
371
372 ::DeleteObject(refData->m_hBitmap);
373 refData->m_hBitmap = dib.Detach();
374 }
375 }
376 }
377 }
378 break;
379 #endif // wxUSE_WXDIB
380
381 case wxBitmapTransparency_Always:
382 refData->m_hasAlpha = true;
383 break;
384 }
385
386 if ( !refData->m_hasAlpha )
387 {
388 // the mask returned by GetIconInfo() is inverted compared to the usual
389 // wxWin convention
390 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
391 }
392
393 // delete the old one now as we don't need it any more
394 ::DeleteObject(iconInfo.hbmMask);
395
396 return true;
397 #else // __WXMICROWIN__ || __WXWINCE__
398 wxUnusedVar(icon);
399 wxUnusedVar(transp);
400
401 return false;
402 #endif // !__WXWINCE__/__WXWINCE__
403 }
404
405 bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp)
406 {
407 UnRef();
408
409 if ( !cursor.IsOk() )
410 return false;
411
412 return CopyFromIconOrCursor(cursor, transp);
413 }
414
415 bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp)
416 {
417 UnRef();
418
419 if ( !icon.IsOk() )
420 return false;
421
422 return CopyFromIconOrCursor(icon, transp);
423 }
424
425 #ifndef NEVER_USE_DIB
426
427 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
428 {
429 wxScopedPtr<wxBitmapRefData> newData(new wxBitmapRefData);
430 newData->CopyFromDIB(dib);
431 if ( !newData->IsOk() )
432 return false;
433
434 UnRef();
435 m_refData = newData.release();
436 return true;
437 }
438
439 #endif // NEVER_USE_DIB
440
441 wxBitmap::~wxBitmap()
442 {
443 }
444
445 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
446 {
447 #ifndef __WXMICROWIN__
448 wxBitmapRefData *refData = new wxBitmapRefData;
449 m_refData = refData;
450
451 refData->m_width = width;
452 refData->m_height = height;
453 refData->m_depth = depth;
454
455 char *data;
456 if ( depth == 1 )
457 {
458 // we assume that it is in XBM format which is not quite the same as
459 // the format CreateBitmap() wants because the order of bytes in the
460 // line is reversed!
461 const size_t bytesPerLine = (width + 7) / 8;
462 const size_t padding = bytesPerLine % 2;
463 const size_t len = height * ( padding + bytesPerLine );
464 data = (char *)malloc(len);
465 const char *src = bits;
466 char *dst = data;
467
468 for ( int rows = 0; rows < height; rows++ )
469 {
470 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
471 {
472 unsigned char val = *src++;
473 unsigned char reversed = 0;
474
475 for ( int bits = 0; bits < 8; bits++)
476 {
477 reversed <<= 1;
478 reversed |= (unsigned char)(val & 0x01);
479 val >>= 1;
480 }
481 *dst++ = ~reversed;
482 }
483
484 if ( padding )
485 *dst++ = 0;
486 }
487 }
488 else
489 {
490 // bits should already be in Windows standard format
491 data = const_cast<char *>(bits);
492 }
493
494 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
495 if ( !hbmp )
496 {
497 wxLogLastError(wxT("CreateBitmap"));
498 }
499
500 if ( data != bits )
501 {
502 free(data);
503 }
504
505 SetHBITMAP((WXHBITMAP)hbmp);
506 #endif
507 }
508
509 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
510 {
511 (void)Create(w, h, dc);
512 }
513
514 wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
515 {
516 (void)Create(data, type, width, height, depth);
517 }
518
519 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
520 {
521 LoadFile(filename, type);
522 }
523
524 bool wxBitmap::Create(int width, int height, int depth)
525 {
526 return DoCreate(width, height, depth, 0);
527 }
528
529 bool wxBitmap::Create(int width, int height, const wxDC& dc)
530 {
531 wxCHECK_MSG( dc.IsOk(), false, wxT("invalid HDC in wxBitmap::Create()") );
532
533 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
534
535 if (impl)
536 return DoCreate(width, height, -1, impl->GetHDC());
537 else
538 return false;
539 }
540
541 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
542 {
543 UnRef();
544
545 m_refData = new wxBitmapRefData;
546
547 GetBitmapData()->m_width = w;
548 GetBitmapData()->m_height = h;
549
550 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
551
552 #ifndef NEVER_USE_DIB
553 if ( wxShouldCreateDIB(w, h, d, hdc) )
554 {
555 if ( d == -1 )
556 {
557 // create DIBs without alpha channel by default
558 d = 24;
559 }
560
561 wxDIB dib(w, h, d);
562 if ( !dib.IsOk() )
563 return false;
564
565 // don't delete the DIB section in dib object dtor
566 hbmp = dib.Detach();
567
568 GetBitmapData()->m_isDIB = true;
569 GetBitmapData()->m_depth = d;
570 }
571 else // create a DDB
572 #endif // NEVER_USE_DIB
573 {
574 #ifndef ALWAYS_USE_DIB
575 #ifndef __WXMICROWIN__
576 if ( d > 0 )
577 {
578 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
579 if ( !hbmp )
580 {
581 wxLogLastError(wxT("CreateBitmap"));
582 }
583
584 GetBitmapData()->m_depth = d;
585 }
586 else // d == 0, create bitmap compatible with the screen
587 #endif // !__WXMICROWIN__
588 {
589 ScreenHDC dc;
590 hbmp = ::CreateCompatibleBitmap(dc, w, h);
591 if ( !hbmp )
592 {
593 wxLogLastError(wxT("CreateCompatibleBitmap"));
594 }
595
596 GetBitmapData()->m_depth = wxDisplayDepth();
597 }
598 #endif // !ALWAYS_USE_DIB
599 }
600
601 SetHBITMAP((WXHBITMAP)hbmp);
602
603 return IsOk();
604 }
605
606 #if wxUSE_IMAGE
607
608 // ----------------------------------------------------------------------------
609 // wxImage to/from conversions for Microwin
610 // ----------------------------------------------------------------------------
611
612 // Microwin versions are so different from normal ones that it really doesn't
613 // make sense to use #ifdefs inside the function bodies
614 #ifdef __WXMICROWIN__
615
616 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
617 {
618 // Set this to 1 to experiment with mask code,
619 // which currently doesn't work
620 #define USE_MASKS 0
621
622 m_refData = new wxBitmapRefData();
623
624 // Initial attempt at a simple-minded implementation.
625 // The bitmap will always be created at the screen depth,
626 // so the 'depth' argument is ignored.
627
628 HDC hScreenDC = ::GetDC(NULL);
629 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
630
631 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
632 HBITMAP hMaskBitmap = NULL;
633 HBITMAP hOldMaskBitmap = NULL;
634 HDC hMaskDC = NULL;
635 unsigned char maskR = 0;
636 unsigned char maskG = 0;
637 unsigned char maskB = 0;
638
639 // printf("Created bitmap %d\n", (int) hBitmap);
640 if (hBitmap == NULL)
641 {
642 ::ReleaseDC(NULL, hScreenDC);
643 return false;
644 }
645 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
646
647 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
648 ::ReleaseDC(NULL, hScreenDC);
649
650 // created an mono-bitmap for the possible mask
651 bool hasMask = image.HasMask();
652
653 if ( hasMask )
654 {
655 #if USE_MASKS
656 // FIXME: we should be able to pass bpp = 1, but
657 // GdBlit can't handle a different depth
658 #if 0
659 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
660 #else
661 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
662 #endif
663 maskR = image.GetMaskRed();
664 maskG = image.GetMaskGreen();
665 maskB = image.GetMaskBlue();
666
667 if (!hMaskBitmap)
668 {
669 hasMask = false;
670 }
671 else
672 {
673 hScreenDC = ::GetDC(NULL);
674 hMaskDC = ::CreateCompatibleDC(hScreenDC);
675 ::ReleaseDC(NULL, hScreenDC);
676
677 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
678 }
679 #else
680 hasMask = false;
681 #endif
682 }
683
684 int i, j;
685 for (i = 0; i < image.GetWidth(); i++)
686 {
687 for (j = 0; j < image.GetHeight(); j++)
688 {
689 unsigned char red = image.GetRed(i, j);
690 unsigned char green = image.GetGreen(i, j);
691 unsigned char blue = image.GetBlue(i, j);
692
693 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
694
695 if (hasMask)
696 {
697 // scan the bitmap for the transparent colour and set the corresponding
698 // pixels in the mask to BLACK and the rest to WHITE
699 if (maskR == red && maskG == green && maskB == blue)
700 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
701 else
702 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
703 }
704 }
705 }
706
707 ::SelectObject(hMemDC, hOldBitmap);
708 ::DeleteDC(hMemDC);
709 if (hasMask)
710 {
711 ::SelectObject(hMaskDC, hOldMaskBitmap);
712 ::DeleteDC(hMaskDC);
713
714 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
715 }
716
717 SetWidth(image.GetWidth());
718 SetHeight(image.GetHeight());
719 SetDepth(screenDepth);
720 SetHBITMAP( (WXHBITMAP) hBitmap );
721
722 #if wxUSE_PALETTE
723 // Copy the palette from the source image
724 SetPalette(image.GetPalette());
725 #endif // wxUSE_PALETTE
726
727 return true;
728 }
729
730 wxImage wxBitmap::ConvertToImage() const
731 {
732 // Initial attempt at a simple-minded implementation.
733 // The bitmap will always be created at the screen depth,
734 // so the 'depth' argument is ignored.
735 // TODO: transparency (create a mask image)
736
737 if (!IsOk())
738 {
739 wxFAIL_MSG( wxT("bitmap is invalid") );
740 return wxNullImage;
741 }
742
743 wxImage image;
744
745 wxCHECK_MSG( IsOk(), wxNullImage, wxT("invalid bitmap") );
746
747 // create an wxImage object
748 int width = GetWidth();
749 int height = GetHeight();
750 image.Create( width, height );
751 unsigned char *data = image.GetData();
752 if( !data )
753 {
754 wxFAIL_MSG( wxT("could not allocate data for image") );
755 return wxNullImage;
756 }
757
758 HDC hScreenDC = ::GetDC(NULL);
759
760 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
761 ::ReleaseDC(NULL, hScreenDC);
762
763 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
764
765 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
766
767 int i, j;
768 for (i = 0; i < GetWidth(); i++)
769 {
770 for (j = 0; j < GetHeight(); j++)
771 {
772 COLORREF color = ::GetPixel(hMemDC, i, j);
773 unsigned char red = GetRValue(color);
774 unsigned char green = GetGValue(color);
775 unsigned char blue = GetBValue(color);
776
777 image.SetRGB(i, j, red, green, blue);
778 }
779 }
780
781 ::SelectObject(hMemDC, hOldBitmap);
782 ::DeleteDC(hMemDC);
783
784 #if wxUSE_PALETTE
785 // Copy the palette from the source image
786 if (GetPalette())
787 image.SetPalette(* GetPalette());
788 #endif // wxUSE_PALETTE
789
790 return image;
791 }
792
793 #endif // __WXMICROWIN__
794
795 // ----------------------------------------------------------------------------
796 // wxImage to/from conversions
797 // ----------------------------------------------------------------------------
798
799 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
800 {
801 return CreateFromImage(image, depth, 0);
802 }
803
804 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
805 {
806 wxCHECK_MSG( dc.IsOk(), false,
807 wxT("invalid HDC in wxBitmap::CreateFromImage()") );
808
809 const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl );
810
811 if (impl)
812 return CreateFromImage(image, -1, impl->GetHDC());
813 else
814 return false;
815 }
816
817 #if wxUSE_WXDIB
818
819 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
820 {
821 wxCHECK_MSG( image.IsOk(), false, wxT("invalid image") );
822
823 UnRef();
824
825 // first convert the image to DIB
826 const int h = image.GetHeight();
827 const int w = image.GetWidth();
828
829 wxDIB dib(image);
830 if ( !dib.IsOk() )
831 return false;
832
833 const bool hasAlpha = image.HasAlpha();
834
835 if (depth == -1)
836 depth = dib.GetDepth();
837
838 // store the bitmap parameters
839 wxBitmapRefData * const refData = new wxBitmapRefData;
840 refData->m_width = w;
841 refData->m_height = h;
842 refData->m_hasAlpha = hasAlpha;
843 refData->m_depth = depth;
844
845 m_refData = refData;
846
847
848 // next either store DIB as is or create a DDB from it
849 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
850
851 // are we going to use DIB?
852 //
853 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
854 if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
855 {
856 // don't delete the DIB section in dib object dtor
857 hbitmap = dib.Detach();
858
859 refData->m_isDIB = true;
860 }
861 #ifndef ALWAYS_USE_DIB
862 else // we need to convert DIB to DDB
863 {
864 hbitmap = dib.CreateDDB((HDC)hdc);
865 }
866 #endif // !ALWAYS_USE_DIB
867
868 // validate this object
869 SetHBITMAP((WXHBITMAP)hbitmap);
870
871 // finally also set the mask if we have one
872 if ( image.HasMask() )
873 {
874 const size_t len = 2*((w+15)/16);
875 BYTE *src = image.GetData();
876 BYTE *data = new BYTE[h*len];
877 memset(data, 0, h*len);
878 BYTE r = image.GetMaskRed(),
879 g = image.GetMaskGreen(),
880 b = image.GetMaskBlue();
881 BYTE *dst = data;
882 for ( int y = 0; y < h; y++, dst += len )
883 {
884 BYTE *dstLine = dst;
885 BYTE mask = 0x80;
886 for ( int x = 0; x < w; x++, src += 3 )
887 {
888 if (src[0] != r || src[1] != g || src[2] != b)
889 *dstLine |= mask;
890
891 if ( (mask >>= 1) == 0 )
892 {
893 dstLine++;
894 mask = 0x80;
895 }
896 }
897 }
898
899 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
900 if ( !hbitmap )
901 {
902 wxLogLastError(wxT("CreateBitmap(mask)"));
903 }
904 else
905 {
906 SetMask(new wxMask((WXHBITMAP)hbitmap));
907 }
908
909 delete[] data;
910 }
911
912 return true;
913 }
914
915 wxImage wxBitmap::ConvertToImage() const
916 {
917 // convert DDB to DIB
918 wxDIB dib(*this);
919
920 if ( !dib.IsOk() )
921 {
922 return wxNullImage;
923 }
924
925 // and then DIB to our wxImage
926 wxImage image = dib.ConvertToImage();
927 if ( !image.IsOk() )
928 {
929 return wxNullImage;
930 }
931
932 // now do the same for the mask, if we have any
933 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
934 if ( hbmpMask )
935 {
936 wxDIB dibMask(hbmpMask);
937 if ( dibMask.IsOk() )
938 {
939 // TODO: use wxRawBitmap to iterate over DIB
940
941 // we hard code the mask colour for now but we could also make an
942 // effort (and waste time) to choose a colour not present in the
943 // image already to avoid having to fudge the pixels below --
944 // whether it's worth to do it is unclear however
945 static const int MASK_RED = 1;
946 static const int MASK_GREEN = 2;
947 static const int MASK_BLUE = 3;
948 static const int MASK_BLUE_REPLACEMENT = 2;
949
950 const int h = dibMask.GetHeight();
951 const int w = dibMask.GetWidth();
952 const int bpp = dibMask.GetDepth();
953 const int maskBytesPerPixel = bpp >> 3;
954 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
955 unsigned char *data = image.GetData();
956
957 // remember that DIBs are stored in bottom to top order
958 unsigned char *
959 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
960
961 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
962 {
963 // traverse one mask DIB line
964 unsigned char *mask = maskLineStart;
965 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
966 {
967 // should this pixel be transparent?
968 if ( *mask )
969 {
970 // no, check that it isn't transparent by accident
971 if ( (data[0] == MASK_RED) &&
972 (data[1] == MASK_GREEN) &&
973 (data[2] == MASK_BLUE) )
974 {
975 // we have to fudge the colour a bit to prevent
976 // this pixel from appearing transparent
977 data[2] = MASK_BLUE_REPLACEMENT;
978 }
979
980 data += 3;
981 }
982 else // yes, transparent pixel
983 {
984 *data++ = MASK_RED;
985 *data++ = MASK_GREEN;
986 *data++ = MASK_BLUE;
987 }
988 }
989 }
990
991 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
992 }
993 }
994
995 return image;
996 }
997
998 #else // !wxUSE_WXDIB
999
1000 bool
1001 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
1002 int WXUNUSED(depth),
1003 WXHDC WXUNUSED(hdc))
1004 {
1005 return false;
1006 }
1007
1008 wxImage wxBitmap::ConvertToImage() const
1009 {
1010 return wxImage();
1011 }
1012
1013 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
1014
1015 #endif // wxUSE_IMAGE
1016
1017 // ----------------------------------------------------------------------------
1018 // loading and saving bitmaps
1019 // ----------------------------------------------------------------------------
1020
1021 bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
1022 {
1023 UnRef();
1024
1025 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1026
1027 if ( handler )
1028 {
1029 m_refData = new wxBitmapRefData;
1030
1031 return handler->LoadFile(this, filename, type, -1, -1);
1032 }
1033 #if wxUSE_IMAGE && wxUSE_WXDIB
1034 else // no bitmap handler found
1035 {
1036 wxImage image;
1037 if ( image.LoadFile( filename, type ) && image.IsOk() )
1038 {
1039 *this = wxBitmap(image);
1040
1041 return true;
1042 }
1043 }
1044 #endif // wxUSE_IMAGE
1045
1046 return false;
1047 }
1048
1049 bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
1050 {
1051 UnRef();
1052
1053 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1054
1055 if ( !handler )
1056 {
1057 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1058
1059 return false;
1060 }
1061
1062 m_refData = new wxBitmapRefData;
1063
1064 return handler->Create(this, data, type, width, height, depth);
1065 }
1066
1067 bool wxBitmap::SaveFile(const wxString& filename,
1068 wxBitmapType type,
1069 const wxPalette *palette) const
1070 {
1071 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1072
1073 if ( handler )
1074 {
1075 return handler->SaveFile(this, filename, type, palette);
1076 }
1077 #if wxUSE_IMAGE && wxUSE_WXDIB
1078 else // no bitmap handler found
1079 {
1080 // FIXME what about palette? shouldn't we use it?
1081 wxImage image = ConvertToImage();
1082 if ( image.IsOk() )
1083 {
1084 return image.SaveFile(filename, type);
1085 }
1086 }
1087 #endif // wxUSE_IMAGE
1088
1089 return false;
1090 }
1091
1092 // ----------------------------------------------------------------------------
1093 // sub bitmap extraction
1094 // ----------------------------------------------------------------------------
1095 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect ) const
1096 {
1097 MemoryHDC dcSrc;
1098 SelectInHDC selectSrc(dcSrc, GetHbitmap());
1099 return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
1100 }
1101
1102 wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) const
1103 {
1104 wxCHECK_MSG( IsOk() &&
1105 (rect.x >= 0) && (rect.y >= 0) &&
1106 (rect.x+rect.width <= GetWidth()) &&
1107 (rect.y+rect.height <= GetHeight()),
1108 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1109
1110 wxBitmap ret( rect.width, rect.height, GetDepth() );
1111 wxASSERT_MSG( ret.IsOk(), wxT("GetSubBitmap error") );
1112
1113 #ifndef __WXMICROWIN__
1114 // handle alpha channel, if any
1115 if (HasAlpha())
1116 ret.UseAlpha();
1117
1118 // copy bitmap data
1119 MemoryHDC dcSrc,
1120 dcDst;
1121
1122 {
1123 SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
1124
1125 if ( !selectDst )
1126 {
1127 wxLogLastError(wxT("SelectObject(destBitmap)"));
1128 }
1129
1130 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1131 (HDC)hdc, rect.x, rect.y, SRCCOPY) )
1132 {
1133 wxLogLastError(wxT("BitBlt"));
1134 }
1135 }
1136
1137 // copy mask if there is one
1138 if ( GetMask() )
1139 {
1140 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1141
1142 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1143 selectDst(dcDst, hbmpMask);
1144
1145 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1146 dcSrc, rect.x, rect.y, SRCCOPY) )
1147 {
1148 wxLogLastError(wxT("BitBlt"));
1149 }
1150
1151 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1152 ret.SetMask(mask);
1153 }
1154 #endif // !__WXMICROWIN__
1155
1156 return ret;
1157 }
1158
1159 // ----------------------------------------------------------------------------
1160 // wxBitmap accessors
1161 // ----------------------------------------------------------------------------
1162
1163 #if wxUSE_PALETTE
1164 wxPalette* wxBitmap::GetPalette() const
1165 {
1166 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1167 : NULL;
1168 }
1169 #endif
1170
1171 wxMask *wxBitmap::GetMask() const
1172 {
1173 return GetBitmapData() ? GetBitmapData()->GetMask() : NULL;
1174 }
1175
1176 wxBitmap wxBitmap::GetMaskBitmap() const
1177 {
1178 wxBitmap bmp;
1179 wxMask *mask = GetMask();
1180 if ( mask )
1181 bmp.SetHBITMAP(mask->GetMaskBitmap());
1182 return bmp;
1183 }
1184
1185 wxDC *wxBitmap::GetSelectedInto() const
1186 {
1187 #if wxDEBUG_LEVEL
1188 return GetBitmapData() ? GetBitmapData()->m_selectedInto : NULL;
1189 #else
1190 return NULL;
1191 #endif
1192 }
1193
1194 void wxBitmap::UseAlpha()
1195 {
1196 if ( GetBitmapData() )
1197 GetBitmapData()->m_hasAlpha = true;
1198 }
1199
1200 bool wxBitmap::HasAlpha() const
1201 {
1202 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1203 }
1204
1205 // ----------------------------------------------------------------------------
1206 // wxBitmap setters
1207 // ----------------------------------------------------------------------------
1208
1209 void wxBitmap::SetSelectedInto(wxDC *dc)
1210 {
1211 #if wxDEBUG_LEVEL
1212 if ( GetBitmapData() )
1213 GetBitmapData()->m_selectedInto = dc;
1214 #else
1215 wxUnusedVar(dc);
1216 #endif
1217 }
1218
1219 #if wxUSE_PALETTE
1220
1221 void wxBitmap::SetPalette(const wxPalette& palette)
1222 {
1223 AllocExclusive();
1224
1225 GetBitmapData()->m_bitmapPalette = palette;
1226 }
1227
1228 #endif // wxUSE_PALETTE
1229
1230 void wxBitmap::SetMask(wxMask *mask)
1231 {
1232 AllocExclusive();
1233
1234 GetBitmapData()->SetMask(mask);
1235 }
1236
1237 // ----------------------------------------------------------------------------
1238 // raw bitmap access support
1239 // ----------------------------------------------------------------------------
1240
1241 #ifdef wxHAS_RAW_BITMAP
1242
1243 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1244 {
1245 #if wxUSE_WXDIB
1246 if ( !IsOk() )
1247 {
1248 // no bitmap, no data (raw or otherwise)
1249 return NULL;
1250 }
1251
1252 // if we're already a DIB we can access our data directly, but if not we
1253 // need to convert this DDB to a DIB section and use it for raw access and
1254 // then convert it back
1255 HBITMAP hDIB;
1256 if ( !GetBitmapData()->m_isDIB )
1257 {
1258 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1259 wxT("GetRawData() may be called only once") );
1260
1261 wxDIB *dib = new wxDIB(*this);
1262 if ( !dib->IsOk() )
1263 {
1264 delete dib;
1265
1266 return NULL;
1267 }
1268
1269 // we'll free it in UngetRawData()
1270 GetBitmapData()->m_dib = dib;
1271
1272 hDIB = dib->GetHandle();
1273 }
1274 else // we're a DIB
1275 {
1276 hDIB = GetHbitmap();
1277 }
1278
1279 DIBSECTION ds;
1280 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1281 {
1282 wxFAIL_MSG( wxT("failed to get DIBSECTION from a DIB?") );
1283
1284 return NULL;
1285 }
1286
1287 // check that the bitmap is in correct format
1288 if ( ds.dsBm.bmBitsPixel != bpp )
1289 {
1290 wxFAIL_MSG( wxT("incorrect bitmap type in wxBitmap::GetRawData()") );
1291
1292 return NULL;
1293 }
1294
1295 // ok, store the relevant info in wxPixelDataBase
1296 const LONG h = ds.dsBm.bmHeight;
1297
1298 data.m_width = ds.dsBm.bmWidth;
1299 data.m_height = h;
1300
1301 // remember that DIBs are stored in top to bottom order!
1302 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1303 // multiple of 2, as required by the documentation. So we use the official
1304 // formula, which we already use elsewhere.)
1305 const LONG bytesPerRow =
1306 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1307 data.m_stride = -bytesPerRow;
1308
1309 char *bits = (char *)ds.dsBm.bmBits;
1310 if ( h > 1 )
1311 {
1312 bits += (h - 1)*bytesPerRow;
1313 }
1314
1315 return bits;
1316 #else
1317 return NULL;
1318 #endif
1319 }
1320
1321 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1322 {
1323 #if wxUSE_WXDIB
1324 if ( !IsOk() )
1325 return;
1326
1327 if ( !&dataBase )
1328 {
1329 // invalid data, don't crash -- but don't assert neither as we're
1330 // called automatically from wxPixelDataBase dtor and so there is no
1331 // way to prevent this from happening
1332 return;
1333 }
1334
1335 // if we're a DDB we need to convert DIB back to DDB now to make the
1336 // changes made via raw bitmap access effective
1337 if ( !GetBitmapData()->m_isDIB )
1338 {
1339 wxDIB *dib = GetBitmapData()->m_dib;
1340 GetBitmapData()->m_dib = NULL;
1341
1342 // TODO: convert
1343
1344 delete dib;
1345 }
1346 #endif // wxUSE_WXDIB
1347 }
1348 #endif // wxHAS_RAW_BITMAP
1349
1350 // ----------------------------------------------------------------------------
1351 // wxMask
1352 // ----------------------------------------------------------------------------
1353
1354 wxMask::wxMask()
1355 {
1356 m_maskBitmap = 0;
1357 }
1358
1359 // Copy constructor
1360 wxMask::wxMask(const wxMask &mask)
1361 : wxObject()
1362 {
1363 BITMAP bmp;
1364
1365 HDC srcDC = CreateCompatibleDC(0);
1366 HDC destDC = CreateCompatibleDC(0);
1367
1368 // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1369 // so we'll use GetObject() API here:
1370 if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1371 {
1372 wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1373 return;
1374 }
1375
1376 // create our HBITMAP
1377 int w = bmp.bmWidth, h = bmp.bmHeight;
1378 m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1379
1380 // copy the mask's HBITMAP into our HBITMAP
1381 SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1382 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1383
1384 BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1385
1386 SelectObject(srcDC, 0);
1387 DeleteDC(srcDC);
1388 SelectObject(destDC, 0);
1389 DeleteDC(destDC);
1390 }
1391
1392 // Construct a mask from a bitmap and a colour indicating
1393 // the transparent area
1394 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1395 {
1396 m_maskBitmap = 0;
1397 Create(bitmap, colour);
1398 }
1399
1400 // Construct a mask from a bitmap and a palette index indicating
1401 // the transparent area
1402 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1403 {
1404 m_maskBitmap = 0;
1405 Create(bitmap, paletteIndex);
1406 }
1407
1408 // Construct a mask from a mono bitmap (copies the bitmap).
1409 wxMask::wxMask(const wxBitmap& bitmap)
1410 {
1411 m_maskBitmap = 0;
1412 Create(bitmap);
1413 }
1414
1415 wxMask::~wxMask()
1416 {
1417 if ( m_maskBitmap )
1418 ::DeleteObject((HBITMAP) m_maskBitmap);
1419 }
1420
1421 // Create a mask from a mono bitmap (copies the bitmap).
1422 bool wxMask::Create(const wxBitmap& bitmap)
1423 {
1424 #ifndef __WXMICROWIN__
1425 wxCHECK_MSG( bitmap.IsOk() && bitmap.GetDepth() == 1, false,
1426 wxT("can't create mask from invalid or not monochrome bitmap") );
1427
1428 if ( m_maskBitmap )
1429 {
1430 ::DeleteObject((HBITMAP) m_maskBitmap);
1431 m_maskBitmap = 0;
1432 }
1433
1434 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1435 bitmap.GetWidth(),
1436 bitmap.GetHeight(),
1437 1, 1, 0
1438 );
1439 HDC srcDC = CreateCompatibleDC(0);
1440 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1441 HDC destDC = CreateCompatibleDC(0);
1442 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1443 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1444 SelectObject(srcDC, 0);
1445 DeleteDC(srcDC);
1446 SelectObject(destDC, 0);
1447 DeleteDC(destDC);
1448 return true;
1449 #else
1450 wxUnusedVar(bitmap);
1451 return false;
1452 #endif
1453 }
1454
1455 // Create a mask from a bitmap and a palette index indicating
1456 // the transparent area
1457 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1458 {
1459 if ( m_maskBitmap )
1460 {
1461 ::DeleteObject((HBITMAP) m_maskBitmap);
1462 m_maskBitmap = 0;
1463 }
1464
1465 #if wxUSE_PALETTE
1466 if (bitmap.IsOk() && bitmap.GetPalette()->IsOk())
1467 {
1468 unsigned char red, green, blue;
1469 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1470 {
1471 wxColour transparentColour(red, green, blue);
1472 return Create(bitmap, transparentColour);
1473 }
1474 }
1475 #endif // wxUSE_PALETTE
1476
1477 return false;
1478 }
1479
1480 // Create a mask from a bitmap and a colour indicating
1481 // the transparent area
1482 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1483 {
1484 #ifndef __WXMICROWIN__
1485 wxCHECK_MSG( bitmap.IsOk(), false, wxT("invalid bitmap in wxMask::Create") );
1486
1487 if ( m_maskBitmap )
1488 {
1489 ::DeleteObject((HBITMAP) m_maskBitmap);
1490 m_maskBitmap = 0;
1491 }
1492
1493 int width = bitmap.GetWidth(),
1494 height = bitmap.GetHeight();
1495
1496 // scan the bitmap for the transparent colour and set the corresponding
1497 // pixels in the mask to BLACK and the rest to WHITE
1498 COLORREF maskColour = wxColourToPalRGB(colour);
1499 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1500
1501 HDC srcDC = ::CreateCompatibleDC(NULL);
1502 HDC destDC = ::CreateCompatibleDC(NULL);
1503 if ( !srcDC || !destDC )
1504 {
1505 wxLogLastError(wxT("CreateCompatibleDC"));
1506 }
1507
1508 bool ok = true;
1509
1510 // SelectObject() will fail
1511 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1512 wxT("bitmap can't be selected in another DC") );
1513
1514 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1515 if ( !hbmpSrcOld )
1516 {
1517 wxLogLastError(wxT("SelectObject"));
1518
1519 ok = false;
1520 }
1521
1522 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1523 if ( !hbmpDstOld )
1524 {
1525 wxLogLastError(wxT("SelectObject"));
1526
1527 ok = false;
1528 }
1529
1530 if ( ok )
1531 {
1532 // this will create a monochrome bitmap with 0 points for the pixels
1533 // which have the same value as the background colour and 1 for the
1534 // others
1535 ::SetBkColor(srcDC, maskColour);
1536 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1537 }
1538
1539 ::SelectObject(srcDC, hbmpSrcOld);
1540 ::DeleteDC(srcDC);
1541 ::SelectObject(destDC, hbmpDstOld);
1542 ::DeleteDC(destDC);
1543
1544 return ok;
1545 #else // __WXMICROWIN__
1546 wxUnusedVar(bitmap);
1547 wxUnusedVar(colour);
1548 return false;
1549 #endif // __WXMICROWIN__/!__WXMICROWIN__
1550 }
1551
1552 // ----------------------------------------------------------------------------
1553 // wxBitmapHandler
1554 // ----------------------------------------------------------------------------
1555
1556 bool wxBitmapHandler::Create(wxGDIImage *image,
1557 const void* data,
1558 wxBitmapType type,
1559 int width, int height, int depth)
1560 {
1561 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1562
1563 return bitmap && Create(bitmap, data, type, width, height, depth);
1564 }
1565
1566 bool wxBitmapHandler::Load(wxGDIImage *image,
1567 const wxString& name,
1568 wxBitmapType type,
1569 int width, int height)
1570 {
1571 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1572
1573 return bitmap && LoadFile(bitmap, name, type, width, height);
1574 }
1575
1576 bool wxBitmapHandler::Save(const wxGDIImage *image,
1577 const wxString& name,
1578 wxBitmapType type) const
1579 {
1580 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1581
1582 return bitmap && SaveFile(bitmap, name, type);
1583 }
1584
1585 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1586 const void* WXUNUSED(data),
1587 wxBitmapType WXUNUSED(type),
1588 int WXUNUSED(width),
1589 int WXUNUSED(height),
1590 int WXUNUSED(depth))
1591 {
1592 return false;
1593 }
1594
1595 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1596 const wxString& WXUNUSED(name),
1597 wxBitmapType WXUNUSED(type),
1598 int WXUNUSED(desiredWidth),
1599 int WXUNUSED(desiredHeight))
1600 {
1601 return false;
1602 }
1603
1604 bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap),
1605 const wxString& WXUNUSED(name),
1606 wxBitmapType WXUNUSED(type),
1607 const wxPalette *WXUNUSED(palette)) const
1608 {
1609 return false;
1610 }
1611
1612 // ----------------------------------------------------------------------------
1613 // global helper functions implemented here
1614 // ----------------------------------------------------------------------------
1615
1616 // helper of wxBitmapToHICON/HCURSOR
1617 static
1618 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1619 bool iconWanted,
1620 int hotSpotX,
1621 int hotSpotY)
1622 {
1623 if ( !bmp.IsOk() )
1624 {
1625 // we can't create an icon/cursor form nothing
1626 return 0;
1627 }
1628
1629 if ( bmp.HasAlpha() )
1630 {
1631 HBITMAP hbmp;
1632
1633 #if wxUSE_WXDIB && wxUSE_IMAGE
1634 // CreateIconIndirect() requires non-pre-multiplied pixel data on input
1635 // as it does pre-multiplication internally itself so we need to create
1636 // a special DIB in such format to pass to it. This is inefficient but
1637 // better than creating an icon with wrong colours.
1638 AutoHBITMAP hbmpRelease;
1639 hbmp = wxDIB(bmp.ConvertToImage(),
1640 wxDIB::PixelFormat_NotPreMultiplied).Detach();
1641 hbmpRelease.Init(hbmp);
1642 #else // !(wxUSE_WXDIB && wxUSE_IMAGE)
1643 hbmp = GetHbitmapOf(bmp);
1644 #endif // wxUSE_WXDIB && wxUSE_IMAGE
1645
1646 // Create an empty mask bitmap.
1647 // it doesn't seem to work if we mess with the mask at all.
1648 AutoHBITMAP
1649 hMonoBitmap(CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL));
1650
1651 ICONINFO iconInfo;
1652 wxZeroMemory(iconInfo);
1653 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1654 if ( !iconWanted )
1655 {
1656 iconInfo.xHotspot = hotSpotX;
1657 iconInfo.yHotspot = hotSpotY;
1658 }
1659
1660 iconInfo.hbmMask = hMonoBitmap;
1661 iconInfo.hbmColor = hbmp;
1662
1663 return ::CreateIconIndirect(&iconInfo);
1664 }
1665
1666 wxMask* mask = bmp.GetMask();
1667
1668 if ( !mask )
1669 {
1670 // we must have a mask for an icon, so even if it's probably incorrect,
1671 // do create it (grey is the "standard" transparent colour)
1672 mask = new wxMask(bmp, *wxLIGHT_GREY);
1673 }
1674
1675 ICONINFO iconInfo;
1676 wxZeroMemory(iconInfo);
1677 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1678 if ( !iconWanted )
1679 {
1680 iconInfo.xHotspot = hotSpotX;
1681 iconInfo.yHotspot = hotSpotY;
1682 }
1683
1684 AutoHBITMAP hbmpMask(wxInvertMask((HBITMAP)mask->GetMaskBitmap()));
1685 iconInfo.hbmMask = hbmpMask;
1686 iconInfo.hbmColor = GetHbitmapOf(bmp);
1687
1688 // black out the transparent area to preserve background colour, because
1689 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1690 // the mask to the dest rect.
1691 {
1692 MemoryHDC dcSrc, dcDst;
1693 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1694 selectBitmap(dcDst, iconInfo.hbmColor);
1695
1696 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1697 dcSrc, 0, 0, SRCAND) )
1698 {
1699 wxLogLastError(wxT("BitBlt"));
1700 }
1701 }
1702
1703 HICON hicon = ::CreateIconIndirect(&iconInfo);
1704
1705 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1706 {
1707 // we created the mask, now delete it
1708 delete mask;
1709 }
1710
1711 return hicon;
1712 }
1713
1714 HICON wxBitmapToHICON(const wxBitmap& bmp)
1715 {
1716 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1717 }
1718
1719 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1720 {
1721 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1722 }
1723
1724 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1725 {
1726 #ifndef __WXMICROWIN__
1727 wxCHECK_MSG( hbmpMask, 0, wxT("invalid bitmap in wxInvertMask") );
1728
1729 // get width/height from the bitmap if not given
1730 if ( !w || !h )
1731 {
1732 BITMAP bm;
1733 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1734 w = bm.bmWidth;
1735 h = bm.bmHeight;
1736 }
1737
1738 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1739 HDC hdcDst = ::CreateCompatibleDC(NULL);
1740 if ( !hdcSrc || !hdcDst )
1741 {
1742 wxLogLastError(wxT("CreateCompatibleDC"));
1743 }
1744
1745 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1746 if ( !hbmpInvMask )
1747 {
1748 wxLogLastError(wxT("CreateBitmap"));
1749 }
1750
1751 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1752 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1753 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1754 hdcSrc, 0, 0,
1755 NOTSRCCOPY) )
1756 {
1757 wxLogLastError(wxT("BitBlt"));
1758 }
1759
1760 // Deselect objects
1761 SelectObject(hdcSrc,srcTmp);
1762 SelectObject(hdcDst,dstTmp);
1763
1764 ::DeleteDC(hdcSrc);
1765 ::DeleteDC(hdcDst);
1766
1767 return hbmpInvMask;
1768 #else
1769 return 0;
1770 #endif
1771 }
wxWidgets (Impactor)