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added CopyFromDIB()
[wxWidgets.git] / src / msw / bitmap.cpp
1 ////////////////////////////////////////////////////////////////////////////
2 // Name: bitmap.cpp
3 // Purpose: wxBitmap
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 04/01/98
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "bitmap.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #ifndef WX_PRECOMP
32 #include <stdio.h>
33
34 #include "wx/list.h"
35 #include "wx/utils.h"
36 #include "wx/app.h"
37 #include "wx/palette.h"
38 #include "wx/dcmemory.h"
39 #include "wx/bitmap.h"
40 #include "wx/icon.h"
41 #endif
42
43 #include "wx/msw/private.h"
44 #include "wx/log.h"
45
46 #if !defined(__WXMICROWIN__)
47 #include "wx/msw/dib.h"
48 #endif
49
50 #include "wx/image.h"
51 #include "wx/xpmdecod.h"
52
53 #include "wx/rawbmp.h"
54
55 // missing from mingw32 header
56 #ifndef CLR_INVALID
57 #define CLR_INVALID ((COLORREF)-1)
58 #endif // no CLR_INVALID
59
60 // ----------------------------------------------------------------------------
61 // Bitmap data
62 // ----------------------------------------------------------------------------
63
64 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
65 {
66 public:
67 wxBitmapRefData();
68 virtual ~wxBitmapRefData() { Free(); }
69
70 virtual void Free();
71
72 // set the mask object to use as the mask, we take ownership of it
73 void SetMask(wxMask *mask)
74 {
75 delete m_bitmapMask;
76 m_bitmapMask = mask;
77 }
78
79 // set the HBITMAP to use as the mask
80 void SetMask(HBITMAP hbmpMask)
81 {
82 SetMask(new wxMask((WXHBITMAP)hbmpMask));
83 }
84
85 // return the mask
86 wxMask *GetMask() const { return m_bitmapMask; }
87
88 public:
89 #if wxUSE_PALETTE
90 wxPalette m_bitmapPalette;
91 #endif // wxUSE_PALETTE
92
93 // MSW-specific
94 // ------------
95
96 #ifdef __WXDEBUG__
97 // this field is solely for error checking: we detect selecting a bitmap
98 // into more than one DC at once or deleting a bitmap still selected into a
99 // DC (both are serious programming errors under Windows)
100 wxDC *m_selectedInto;
101 #endif // __WXDEBUG__
102
103 // true if we have alpha transparency info and can be drawn using
104 // AlphaBlend()
105 bool m_hasAlpha;
106
107 private:
108 // optional mask for transparent drawing
109 wxMask *m_bitmapMask;
110
111 DECLARE_NO_COPY_CLASS(wxBitmapRefData)
112 };
113
114 // ----------------------------------------------------------------------------
115 // macros
116 // ----------------------------------------------------------------------------
117
118 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
119 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
120
121 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
122
123 // ============================================================================
124 // implementation
125 // ============================================================================
126
127 // ----------------------------------------------------------------------------
128 // helper functions
129 // ----------------------------------------------------------------------------
130
131 // decide whether we should create a DIB or a DDB for the given parameters
132 static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
133 {
134 // here is the logic:
135 //
136 // (a) if hdc is specified, the caller explicitly wants DDB
137 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
138 // less DIBs anyhow)
139 // (c) finally, create DIBs under Win9x even if the depth hasn't been
140 // explicitly specified but the current display depth is 24 or more
141 // and the image is "big", i.e. > 16Mb which is the theoretical limit
142 // for DDBs under Win9x
143 //
144 // consequences (all of which seem to make sense):
145 //
146 // (i) by default, DDBs are created (depth == -1 usually)
147 // (ii) DIBs can be created by explicitly specifying the depth
148 // (iii) using a DC always forces creating a DDB
149 return !hdc &&
150 (d >= 24 ||
151 (d == -1 &&
152 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
153 }
154
155 // ----------------------------------------------------------------------------
156 // wxBitmapRefData
157 // ----------------------------------------------------------------------------
158
159 wxBitmapRefData::wxBitmapRefData()
160 {
161 #ifdef __WXDEBUG__
162 m_selectedInto = NULL;
163 #endif
164 m_bitmapMask = NULL;
165 m_hBitmap = (WXHBITMAP) NULL;
166 m_hasAlpha = FALSE;
167 }
168
169 void wxBitmapRefData::Free()
170 {
171 wxASSERT_MSG( !m_selectedInto,
172 wxT("deleting bitmap still selected into wxMemoryDC") );
173
174 if ( m_hBitmap)
175 {
176 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
177 {
178 wxLogLastError(wxT("DeleteObject(hbitmap)"));
179 }
180 }
181
182 delete m_bitmapMask;
183 m_bitmapMask = NULL;
184 }
185
186 // ----------------------------------------------------------------------------
187 // wxBitmap creation
188 // ----------------------------------------------------------------------------
189
190 // this function should be called from all wxBitmap ctors
191 void wxBitmap::Init()
192 {
193 // m_refData = NULL; done in the base class ctor
194 }
195
196 wxGDIImageRefData *wxBitmap::CreateData() const
197 {
198 return new wxBitmapRefData;
199 }
200
201 #ifdef __WIN32__
202
203 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
204 {
205 #ifndef __WXMICROWIN__
206 // it may be either HICON or HCURSOR
207 HICON hicon = (HICON)icon.GetHandle();
208
209 ICONINFO iconInfo;
210 if ( !::GetIconInfo(hicon, &iconInfo) )
211 {
212 wxLogLastError(wxT("GetIconInfo"));
213
214 return FALSE;
215 }
216
217 wxBitmapRefData *refData = new wxBitmapRefData;
218 m_refData = refData;
219
220 int w = icon.GetWidth(),
221 h = icon.GetHeight();
222
223 refData->m_width = w;
224 refData->m_height = h;
225 refData->m_depth = wxDisplayDepth();
226
227 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
228
229 // the mask returned by GetIconInfo() is inversed compared to the usual
230 // wxWin convention
231 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
232
233
234 // delete the old one now as we don't need it any more
235 ::DeleteObject(iconInfo.hbmMask);
236
237 #if WXWIN_COMPATIBILITY_2
238 refData->m_ok = TRUE;
239 #endif // WXWIN_COMPATIBILITY_2
240
241 return TRUE;
242 #else
243 return FALSE;
244 #endif
245 }
246
247 #endif // Win32
248
249 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
250 {
251 UnRef();
252
253 if ( !cursor.Ok() )
254 return FALSE;
255
256 #ifdef __WIN16__
257 wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
258
259 return FALSE;
260 #else
261 return CopyFromIconOrCursor(cursor);
262 #endif // Win16
263 }
264
265 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
266 {
267 UnRef();
268
269 if ( !icon.Ok() )
270 return FALSE;
271
272 // GetIconInfo() doesn't exist under Win16 and I don't know any other way
273 // to create a bitmap from icon there - but using this way we won't have
274 // the mask (FIXME)
275 #ifdef __WIN16__
276 int width = icon.GetWidth(),
277 height = icon.GetHeight();
278
279 // copy the icon to the bitmap
280 ScreenHDC hdcScreen;
281 HDC hdc = ::CreateCompatibleDC(hdcScreen);
282 HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
283 HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
284
285 ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
286
287 ::SelectObject(hdc, hbmpOld);
288 ::DeleteDC(hdc);
289
290 wxBitmapRefData *refData = new wxBitmapRefData;
291 m_refData = refData;
292
293 refData->m_width = width;
294 refData->m_height = height;
295 refData->m_depth = wxDisplayDepth();
296
297 refData->m_hBitmap = (WXHBITMAP)hbitmap;
298
299 #if WXWIN_COMPATIBILITY_2
300 refData->m_ok = TRUE;
301 #endif // WXWIN_COMPATIBILITY_2
302
303 return TRUE;
304 #else // Win32
305 return CopyFromIconOrCursor(icon);
306 #endif // Win16/Win32
307 }
308
309 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
310 {
311 wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
312
313 HBITMAP hbitmap = dib.CreateDDB();
314 if ( !hbitmap )
315 return FALSE;
316
317 UnRef();
318
319 wxBitmapRefData *refData = new wxBitmapRefData;
320 m_refData = refData;
321
322 refData->m_width = dib.GetWidth();
323 refData->m_height = dib.GetHeight();
324 refData->m_depth = dib.GetDepth();
325
326 refData->m_hBitmap = (WXHBITMAP)hbitmap;
327
328 #if wxUSE_PALETTE
329 wxPalette *palette = dib.CreatePalette();
330 if ( palette )
331 {
332 refData->m_bitmapPalette = *palette;
333 }
334
335 delete palette;
336 #endif // wxUSE_PALETTE
337
338 return TRUE;
339 }
340
341 wxBitmap::~wxBitmap()
342 {
343 }
344
345 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
346 {
347 Init();
348
349 #ifndef __WXMICROWIN__
350 wxBitmapRefData *refData = new wxBitmapRefData;
351 m_refData = refData;
352
353 refData->m_width = width;
354 refData->m_height = height;
355 refData->m_depth = depth;
356
357 char *data;
358 if ( depth == 1 )
359 {
360 // we assume that it is in XBM format which is not quite the same as
361 // the format CreateBitmap() wants because the order of bytes in the
362 // line is inversed!
363 const size_t bytesPerLine = (width + 7) / 8;
364 const size_t padding = bytesPerLine % 2;
365 const size_t len = height * ( padding + bytesPerLine );
366 data = (char *)malloc(len);
367 const char *src = bits;
368 char *dst = data;
369
370 for ( int rows = 0; rows < height; rows++ )
371 {
372 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
373 {
374 unsigned char val = *src++;
375 unsigned char reversed = 0;
376
377 for ( int bits = 0; bits < 8; bits++)
378 {
379 reversed <<= 1;
380 reversed |= (val & 0x01);
381 val >>= 1;
382 }
383 *dst++ = reversed;
384 }
385
386 if ( padding )
387 *dst++ = 0;
388 }
389 }
390 else
391 {
392 // bits should already be in Windows standard format
393 data = (char *)bits; // const_cast is harmless
394 }
395
396 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
397 if ( !hbmp )
398 {
399 wxLogLastError(wxT("CreateBitmap"));
400 }
401
402 if ( data != bits )
403 {
404 free(data);
405 }
406
407 SetHBITMAP((WXHBITMAP)hbmp);
408 #endif
409 }
410
411 // Create from XPM data
412 bool wxBitmap::CreateFromXpm(const char **data)
413 {
414 #if wxUSE_IMAGE && wxUSE_XPM
415 Init();
416
417 wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
418
419 wxXPMDecoder decoder;
420 wxImage img = decoder.ReadData(data);
421 wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
422
423 *this = wxBitmap(img);
424 return TRUE;
425 #else
426 return FALSE;
427 #endif
428 }
429
430 wxBitmap::wxBitmap(int w, int h, int d)
431 {
432 Init();
433
434 (void)Create(w, h, d);
435 }
436
437 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
438 {
439 Init();
440
441 (void)Create(data, type, width, height, depth);
442 }
443
444 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
445 {
446 Init();
447
448 LoadFile(filename, (int)type);
449 }
450
451 bool wxBitmap::Create(int width, int height, int depth)
452 {
453 return DoCreate(width, height, depth, 0);
454 }
455
456 bool wxBitmap::Create(int width, int height, const wxDC& dc)
457 {
458 wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
459
460 return DoCreate(width, height, -1, dc.GetHDC());
461 }
462
463 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
464 {
465 UnRef();
466
467 m_refData = new wxBitmapRefData;
468
469 GetBitmapData()->m_width = w;
470 GetBitmapData()->m_height = h;
471
472 HBITMAP hbmp;
473
474 if ( wxShouldCreateDIB(w, h, d, hdc) )
475 {
476 if ( d == -1 )
477 {
478 // create DIBs without alpha channel by default
479 d = 24;
480 }
481
482 wxDIB dib(w, h, d);
483 if ( !dib.IsOk() )
484 return FALSE;
485
486 // don't delete the DIB section in dib object dtor
487 hbmp = dib.Detach();
488
489 GetBitmapData()->m_depth = d;
490 GetBitmapData()->m_hasAlpha = d == 32; // 32bpp DIBs have alpha channel
491 }
492 else // create a DDB
493 {
494 if ( d == -1 )
495 d = wxDisplayDepth();
496
497 GetBitmapData()->m_depth = d;
498
499 #ifndef __WXMICROWIN__
500 if ( d > 0 )
501 {
502 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
503 if ( !hbmp )
504 {
505 wxLogLastError(wxT("CreateBitmap"));
506 }
507 }
508 else
509 #endif // !__WXMICROWIN__
510 {
511 ScreenHDC dc;
512 hbmp = ::CreateCompatibleBitmap(dc, w, h);
513 if ( !hbmp )
514 {
515 wxLogLastError(wxT("CreateCompatibleBitmap"));
516 }
517
518 GetBitmapData()->m_depth = wxDisplayDepth();
519 }
520 }
521
522 SetHBITMAP((WXHBITMAP)hbmp);
523
524 #if WXWIN_COMPATIBILITY_2
525 GetBitmapData()->m_ok = hbmp != 0;
526 #endif // WXWIN_COMPATIBILITY_2
527
528 return Ok();
529 }
530
531 #if wxUSE_IMAGE
532
533 // ----------------------------------------------------------------------------
534 // wxImage to/from conversions for Microwin
535 // ----------------------------------------------------------------------------
536
537 // Microwin versions are so different from normal ones that it really doesn't
538 // make sense to use #ifdefs inside the function bodies
539 #ifdef __WXMICROWIN__
540
541 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
542 {
543 // Set this to 1 to experiment with mask code,
544 // which currently doesn't work
545 #define USE_MASKS 0
546
547 m_refData = new wxBitmapRefData();
548
549 // Initial attempt at a simple-minded implementation.
550 // The bitmap will always be created at the screen depth,
551 // so the 'depth' argument is ignored.
552
553 HDC hScreenDC = ::GetDC(NULL);
554 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
555
556 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
557 HBITMAP hMaskBitmap = NULL;
558 HBITMAP hOldMaskBitmap = NULL;
559 HDC hMaskDC = NULL;
560 unsigned char maskR = 0;
561 unsigned char maskG = 0;
562 unsigned char maskB = 0;
563
564 // printf("Created bitmap %d\n", (int) hBitmap);
565 if (hBitmap == NULL)
566 {
567 ::ReleaseDC(NULL, hScreenDC);
568 return FALSE;
569 }
570 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
571
572 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
573 ::ReleaseDC(NULL, hScreenDC);
574
575 // created an mono-bitmap for the possible mask
576 bool hasMask = image.HasMask();
577
578 if ( hasMask )
579 {
580 #if USE_MASKS
581 // FIXME: we should be able to pass bpp = 1, but
582 // GdBlit can't handle a different depth
583 #if 0
584 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
585 #else
586 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
587 #endif
588 maskR = image.GetMaskRed();
589 maskG = image.GetMaskGreen();
590 maskB = image.GetMaskBlue();
591
592 if (!hMaskBitmap)
593 {
594 hasMask = FALSE;
595 }
596 else
597 {
598 hScreenDC = ::GetDC(NULL);
599 hMaskDC = ::CreateCompatibleDC(hScreenDC);
600 ::ReleaseDC(NULL, hScreenDC);
601
602 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
603 }
604 #else
605 hasMask = FALSE;
606 #endif
607 }
608
609 int i, j;
610 for (i = 0; i < image.GetWidth(); i++)
611 {
612 for (j = 0; j < image.GetHeight(); j++)
613 {
614 unsigned char red = image.GetRed(i, j);
615 unsigned char green = image.GetGreen(i, j);
616 unsigned char blue = image.GetBlue(i, j);
617
618 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
619
620 if (hasMask)
621 {
622 // scan the bitmap for the transparent colour and set the corresponding
623 // pixels in the mask to BLACK and the rest to WHITE
624 if (maskR == red && maskG == green && maskB == blue)
625 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
626 else
627 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
628 }
629 }
630 }
631
632 ::SelectObject(hMemDC, hOldBitmap);
633 ::DeleteDC(hMemDC);
634 if (hasMask)
635 {
636 ::SelectObject(hMaskDC, hOldMaskBitmap);
637 ::DeleteDC(hMaskDC);
638
639 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
640 }
641
642 SetWidth(image.GetWidth());
643 SetHeight(image.GetHeight());
644 SetDepth(screenDepth);
645 SetHBITMAP( (WXHBITMAP) hBitmap );
646
647 #if wxUSE_PALETTE
648 // Copy the palette from the source image
649 SetPalette(image.GetPalette());
650 #endif // wxUSE_PALETTE
651
652 #if WXWIN_COMPATIBILITY_2
653 // check the wxBitmap object
654 GetBitmapData()->SetOk();
655 #endif // WXWIN_COMPATIBILITY_2
656
657 return TRUE;
658 }
659
660 wxImage wxBitmap::ConvertToImage() const
661 {
662 // Initial attempt at a simple-minded implementation.
663 // The bitmap will always be created at the screen depth,
664 // so the 'depth' argument is ignored.
665 // TODO: transparency (create a mask image)
666
667 if (!Ok())
668 {
669 wxFAIL_MSG( wxT("bitmap is invalid") );
670 return wxNullImage;
671 }
672
673 wxImage image;
674
675 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
676
677 // create an wxImage object
678 int width = GetWidth();
679 int height = GetHeight();
680 image.Create( width, height );
681 unsigned char *data = image.GetData();
682 if( !data )
683 {
684 wxFAIL_MSG( wxT("could not allocate data for image") );
685 return wxNullImage;
686 }
687
688 HDC hScreenDC = ::GetDC(NULL);
689
690 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
691 ::ReleaseDC(NULL, hScreenDC);
692
693 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
694
695 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
696
697 int i, j;
698 for (i = 0; i < GetWidth(); i++)
699 {
700 for (j = 0; j < GetHeight(); j++)
701 {
702 COLORREF color = ::GetPixel(hMemDC, i, j);
703 unsigned char red = GetRValue(color);
704 unsigned char green = GetGValue(color);
705 unsigned char blue = GetBValue(color);
706
707 image.SetRGB(i, j, red, green, blue);
708 }
709 }
710
711 ::SelectObject(hMemDC, hOldBitmap);
712 ::DeleteDC(hMemDC);
713
714 #if wxUSE_PALETTE
715 // Copy the palette from the source image
716 if (GetPalette())
717 image.SetPalette(* GetPalette());
718 #endif // wxUSE_PALETTE
719
720 return image;
721 }
722
723 #endif // __WXMICROWIN__
724
725 // ----------------------------------------------------------------------------
726 // wxImage to/from conversions
727 // ----------------------------------------------------------------------------
728
729 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
730 {
731 return CreateFromImage(image, depth, 0);
732 }
733
734 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
735 {
736 wxCHECK_MSG( dc.Ok(), FALSE,
737 _T("invalid HDC in wxBitmap::CreateFromImage()") );
738
739 return CreateFromImage(image, -1, dc.GetHDC());
740 }
741
742 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
743 {
744 wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
745
746 UnRef();
747
748 // first convert the image to DIB
749 const int h = image.GetHeight();
750 const int w = image.GetWidth();
751
752 wxDIB dib(image);
753 if ( !dib.IsOk() )
754 return FALSE;
755
756
757 // store the bitmap parameters
758 wxBitmapRefData *refData = new wxBitmapRefData;
759 refData->m_width = w;
760 refData->m_height = h;
761 refData->m_hasAlpha = image.HasAlpha();
762
763 m_refData = refData;
764
765
766 // next either store DIB as is or create a DDB from it
767 HBITMAP hbitmap;
768
769 // are we going to use DIB?
770 if ( wxShouldCreateDIB(w, h, depth, hdc) )
771 {
772 // don't delete the DIB section in dib object dtor
773 hbitmap = dib.Detach();
774
775 refData->m_depth = dib.GetDepth();
776 }
777 else // we need to convert DIB to DDB
778 {
779 hbitmap = dib.CreateDDB((HDC)hdc);
780
781 refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
782 }
783
784 // validate this object
785 SetHBITMAP((WXHBITMAP)hbitmap);
786
787 #if WXWIN_COMPATIBILITY_2
788 m_refData->m_ok = TRUE;
789 #endif // WXWIN_COMPATIBILITY_2
790
791 // finally also set the mask if we have one
792 if ( image.HasMask() )
793 {
794 SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
795 image.GetMaskGreen(),
796 image.GetMaskBlue())));
797 }
798
799 return TRUE;
800 }
801
802 wxImage wxBitmap::ConvertToImage() const
803 {
804 wxImage image;
805
806 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
807
808 // create an wxImage object
809 int width = GetWidth();
810 int height = GetHeight();
811 image.Create( width, height );
812 unsigned char *data = image.GetData();
813 if( !data )
814 {
815 wxFAIL_MSG( wxT("could not allocate data for image") );
816 return wxNullImage;
817 }
818
819 // calc the number of bytes per scanline and padding in the DIB
820 int bytePerLine = width*3;
821 int sizeDWORD = sizeof( DWORD );
822 int lineBoundary = bytePerLine % sizeDWORD;
823 int padding = 0;
824 if( lineBoundary > 0 )
825 {
826 padding = sizeDWORD - lineBoundary;
827 bytePerLine += padding;
828 }
829
830 // create a DIB header
831 int headersize = sizeof(BITMAPINFOHEADER);
832 BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
833 if( !lpDIBh )
834 {
835 wxFAIL_MSG( wxT("could not allocate data for DIB header") );
836 free( data );
837 return wxNullImage;
838 }
839 // Fill in the DIB header
840 lpDIBh->bmiHeader.biSize = headersize;
841 lpDIBh->bmiHeader.biWidth = width;
842 lpDIBh->bmiHeader.biHeight = -height;
843 lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
844 lpDIBh->bmiHeader.biPlanes = 1;
845 lpDIBh->bmiHeader.biBitCount = 24;
846 lpDIBh->bmiHeader.biCompression = BI_RGB;
847 lpDIBh->bmiHeader.biClrUsed = 0;
848 // These seem not really needed for our purpose here.
849 lpDIBh->bmiHeader.biClrImportant = 0;
850 lpDIBh->bmiHeader.biXPelsPerMeter = 0;
851 lpDIBh->bmiHeader.biYPelsPerMeter = 0;
852 // memory for DIB data
853 unsigned char *lpBits;
854 lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
855 if( !lpBits )
856 {
857 wxFAIL_MSG( wxT("could not allocate data for DIB") );
858 free( data );
859 free( lpDIBh );
860 return wxNullImage;
861 }
862
863 // copy data from the device-dependent bitmap to the DIB
864 HDC hdc = ::GetDC(NULL);
865 HBITMAP hbitmap;
866 hbitmap = (HBITMAP) GetHBITMAP();
867 ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
868
869 // copy DIB data into the wxImage object
870 int i, j;
871 unsigned char *ptdata = data;
872 unsigned char *ptbits = lpBits;
873 for( i=0; i<height; i++ )
874 {
875 for( j=0; j<width; j++ )
876 {
877 *(ptdata++) = *(ptbits+2);
878 *(ptdata++) = *(ptbits+1);
879 *(ptdata++) = *(ptbits );
880 ptbits += 3;
881 }
882 ptbits += padding;
883 }
884
885 // similarly, set data according to the possible mask bitmap
886 if( GetMask() && GetMask()->GetMaskBitmap() )
887 {
888 hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
889 // memory DC created, color set, data copied, and memory DC deleted
890 HDC memdc = ::CreateCompatibleDC( hdc );
891 ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
892 ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
893 ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
894 ::DeleteDC( memdc );
895 // background color set to RGB(16,16,16) in consistent with wxGTK
896 unsigned char r=16, g=16, b=16;
897 ptdata = data;
898 ptbits = lpBits;
899 for( i=0; i<height; i++ )
900 {
901 for( j=0; j<width; j++ )
902 {
903 if( *ptbits != 0 )
904 ptdata += 3;
905 else
906 {
907 *(ptdata++) = r;
908 *(ptdata++) = g;
909 *(ptdata++) = b;
910 }
911 ptbits += 3;
912 }
913 ptbits += padding;
914 }
915 image.SetMaskColour( r, g, b );
916 image.SetMask( TRUE );
917 }
918 else
919 {
920 image.SetMask( FALSE );
921 }
922 // free allocated resources
923 ::ReleaseDC(NULL, hdc);
924 free(lpDIBh);
925 free(lpBits);
926
927 return image;
928 }
929
930 #endif // wxUSE_IMAGE
931
932 // ----------------------------------------------------------------------------
933 // loading and saving bitmaps
934 // ----------------------------------------------------------------------------
935
936 bool wxBitmap::LoadFile(const wxString& filename, long type)
937 {
938 UnRef();
939
940 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
941
942 if ( handler )
943 {
944 m_refData = new wxBitmapRefData;
945
946 return handler->LoadFile(this, filename, type, -1, -1);
947 }
948 #if wxUSE_IMAGE
949 else
950 {
951 wxImage image;
952 if ( image.LoadFile( filename, type ) && image.Ok() )
953 {
954 *this = wxBitmap(image);
955
956 return TRUE;
957 }
958 }
959 #endif // wxUSE_IMAGE
960
961 return FALSE;
962 }
963
964 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
965 {
966 UnRef();
967
968 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
969
970 if ( !handler )
971 {
972 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
973
974 return FALSE;
975 }
976
977 m_refData = new wxBitmapRefData;
978
979 return handler->Create(this, data, type, width, height, depth);
980 }
981
982 bool wxBitmap::SaveFile(const wxString& filename,
983 int type,
984 const wxPalette *palette)
985 {
986 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
987
988 if ( handler )
989 {
990 return handler->SaveFile(this, filename, type, palette);
991 }
992 #if wxUSE_IMAGE
993 else
994 {
995 // FIXME what about palette? shouldn't we use it?
996 wxImage image = ConvertToImage();
997 if ( image.Ok() )
998 {
999 return image.SaveFile(filename, type);
1000 }
1001 }
1002 #endif // wxUSE_IMAGE
1003
1004 return FALSE;
1005 }
1006
1007 // ----------------------------------------------------------------------------
1008 // sub bitmap extraction
1009 // ----------------------------------------------------------------------------
1010
1011 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1012 {
1013 wxCHECK_MSG( Ok() &&
1014 (rect.x >= 0) && (rect.y >= 0) &&
1015 (rect.x+rect.width <= GetWidth()) &&
1016 (rect.y+rect.height <= GetHeight()),
1017 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1018
1019 wxBitmap ret( rect.width, rect.height );
1020 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1021
1022 #ifndef __WXMICROWIN__
1023 // TODO: copy alpha channel data if any
1024
1025 // copy bitmap data
1026 MemoryHDC dcSrc,
1027 dcDst;
1028
1029 {
1030 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1031 selectDst(dcDst, GetHbitmapOf(ret));
1032
1033 if ( !selectSrc || !selectDst )
1034 {
1035 wxLogLastError(_T("SelectObjct(hBitmap)"));
1036 }
1037
1038 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1039 dcSrc, rect.x, rect.y, SRCCOPY) )
1040 {
1041 wxLogLastError(_T("BitBlt"));
1042 }
1043 }
1044
1045 // copy mask if there is one
1046 if ( GetMask() )
1047 {
1048 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1049
1050 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1051 selectDst(dcDst, hbmpMask);
1052
1053 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1054 dcSrc, rect.x, rect.y, SRCCOPY) )
1055 {
1056 wxLogLastError(_T("BitBlt"));
1057 }
1058
1059 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1060 ret.SetMask(mask);
1061 }
1062 #endif // !__WXMICROWIN__
1063
1064 return ret;
1065 }
1066
1067 // ----------------------------------------------------------------------------
1068 // wxBitmap accessors
1069 // ----------------------------------------------------------------------------
1070
1071 wxPalette* wxBitmap::GetPalette() const
1072 {
1073 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1074 : (wxPalette *) NULL;
1075 }
1076
1077 wxMask *wxBitmap::GetMask() const
1078 {
1079 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1080 }
1081
1082 #ifdef __WXDEBUG__
1083
1084 wxDC *wxBitmap::GetSelectedInto() const
1085 {
1086 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1087 }
1088
1089 #endif
1090
1091 #if WXWIN_COMPATIBILITY_2_4
1092
1093 int wxBitmap::GetQuality() const
1094 {
1095 return 0;
1096 }
1097
1098 #endif // WXWIN_COMPATIBILITY_2_4
1099
1100 bool wxBitmap::HasAlpha() const
1101 {
1102 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1103 }
1104
1105 // ----------------------------------------------------------------------------
1106 // wxBitmap setters
1107 // ----------------------------------------------------------------------------
1108
1109 #ifdef __WXDEBUG__
1110
1111 void wxBitmap::SetSelectedInto(wxDC *dc)
1112 {
1113 if ( GetBitmapData() )
1114 GetBitmapData()->m_selectedInto = dc;
1115 }
1116
1117 #endif
1118
1119 #if wxUSE_PALETTE
1120
1121 void wxBitmap::SetPalette(const wxPalette& palette)
1122 {
1123 EnsureHasData();
1124
1125 GetBitmapData()->m_bitmapPalette = palette;
1126 }
1127
1128 #endif // wxUSE_PALETTE
1129
1130 void wxBitmap::SetMask(wxMask *mask)
1131 {
1132 EnsureHasData();
1133
1134 GetBitmapData()->SetMask(mask);
1135 }
1136
1137 #if WXWIN_COMPATIBILITY_2
1138
1139 void wxBitmap::SetOk(bool isOk)
1140 {
1141 EnsureHasData();
1142
1143 GetBitmapData()->m_ok = isOk;
1144 }
1145
1146 #endif // WXWIN_COMPATIBILITY_2
1147
1148 #if WXWIN_COMPATIBILITY_2_4
1149
1150 void wxBitmap::SetQuality(int WXUNUSED(quality))
1151 {
1152 }
1153
1154 #endif // WXWIN_COMPATIBILITY_2_4
1155
1156 // ----------------------------------------------------------------------------
1157 // raw bitmap access support
1158 // ----------------------------------------------------------------------------
1159
1160 bool wxBitmap::GetRawData(wxRawBitmapData *data)
1161 {
1162 wxCHECK_MSG( data, FALSE, _T("NULL pointer in wxBitmap::GetRawData") );
1163
1164 if ( !Ok() )
1165 {
1166 // no bitmap, no data (raw or otherwise)
1167 return FALSE;
1168 }
1169
1170 // we only support raw access to the DIBs, so check if we have one
1171 DIBSECTION ds;
1172 if ( !::GetObject(GetHbitmap(), sizeof(ds), &ds) )
1173 {
1174 return FALSE;
1175 }
1176
1177 // ok, store the relevant info in wxRawBitmapData
1178 const LONG h = ds.dsBm.bmHeight;
1179
1180 data->m_width = ds.dsBm.bmWidth;
1181 data->m_height = h;
1182 data->m_bypp = ds.dsBm.bmBitsPixel / 8;
1183
1184 // remember that DIBs are stored in top to bottom order!
1185 const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1186 data->m_stride = -bytesPerRow;
1187 data->m_pixels = (unsigned char *)ds.dsBm.bmBits;
1188 if ( h > 1 )
1189 {
1190 data->m_pixels += (h - 1)*bytesPerRow;
1191 }
1192
1193 return TRUE;
1194 }
1195
1196 // ----------------------------------------------------------------------------
1197 // TODO: to be replaced by something better
1198 // ----------------------------------------------------------------------------
1199
1200 // Creates a bitmap that matches the device context, from
1201 // an arbitray bitmap. At present, the original bitmap must have an
1202 // associated palette. TODO: use a default palette if no palette exists.
1203 // Contributed by Frederic Villeneuve <frederic.villeneuve@natinst.com>
1204 wxBitmap wxBitmap::GetBitmapForDC(wxDC& dc) const
1205 {
1206 #ifdef __WXMICROWIN__
1207 return *this;
1208 #else
1209 wxMemoryDC memDC;
1210 wxBitmap tmpBitmap(GetWidth(), GetHeight(), dc.GetDepth());
1211 HPALETTE hPal = (HPALETTE) NULL;
1212 LPBITMAPINFO lpDib;
1213 void *lpBits = (void*) NULL;
1214
1215 #if wxUSE_PALETTE
1216 if( GetPalette() && GetPalette()->Ok() )
1217 {
1218 tmpBitmap.SetPalette(*GetPalette());
1219 memDC.SelectObject(tmpBitmap);
1220 memDC.SetPalette(*GetPalette());
1221 hPal = (HPALETTE)GetPalette()->GetHPALETTE();
1222 }
1223 else
1224 {
1225 hPal = (HPALETTE) ::GetStockObject(DEFAULT_PALETTE);
1226 wxPalette palette;
1227 palette.SetHPALETTE( (WXHPALETTE)hPal );
1228 tmpBitmap.SetPalette( palette );
1229 memDC.SelectObject(tmpBitmap);
1230 memDC.SetPalette( palette );
1231 }
1232 #else // !wxUSE_PALETTE
1233 hPal = (HPALETTE) ::GetStockObject(DEFAULT_PALETTE);
1234 #endif // wxUSE_PALETTE/!wxUSE_PALETTE
1235
1236 // set the height negative because in a DIB the order of the lines is
1237 // reversed
1238 if ( !wxCreateDIB(GetWidth(), -GetHeight(), GetDepth(), hPal, &lpDib) )
1239 {
1240 return wxNullBitmap;
1241 }
1242
1243 lpBits = malloc(lpDib->bmiHeader.biSizeImage);
1244
1245 ::GetBitmapBits(GetHbitmap(), lpDib->bmiHeader.biSizeImage, lpBits);
1246
1247 ::SetDIBitsToDevice(GetHdcOf(memDC), 0, 0,
1248 GetWidth(), GetHeight(),
1249 0, 0, 0, GetHeight(),
1250 lpBits, lpDib, DIB_RGB_COLORS);
1251
1252 free(lpBits);
1253
1254 wxFreeDIB(lpDib);
1255
1256 return tmpBitmap;
1257 #endif
1258 }
1259
1260 // ----------------------------------------------------------------------------
1261 // wxMask
1262 // ----------------------------------------------------------------------------
1263
1264 wxMask::wxMask()
1265 {
1266 m_maskBitmap = 0;
1267 }
1268
1269 // Construct a mask from a bitmap and a colour indicating
1270 // the transparent area
1271 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1272 {
1273 m_maskBitmap = 0;
1274 Create(bitmap, colour);
1275 }
1276
1277 // Construct a mask from a bitmap and a palette index indicating
1278 // the transparent area
1279 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1280 {
1281 m_maskBitmap = 0;
1282 Create(bitmap, paletteIndex);
1283 }
1284
1285 // Construct a mask from a mono bitmap (copies the bitmap).
1286 wxMask::wxMask(const wxBitmap& bitmap)
1287 {
1288 m_maskBitmap = 0;
1289 Create(bitmap);
1290 }
1291
1292 wxMask::~wxMask()
1293 {
1294 if ( m_maskBitmap )
1295 ::DeleteObject((HBITMAP) m_maskBitmap);
1296 }
1297
1298 // Create a mask from a mono bitmap (copies the bitmap).
1299 bool wxMask::Create(const wxBitmap& bitmap)
1300 {
1301 #ifndef __WXMICROWIN__
1302 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1303 _T("can't create mask from invalid or not monochrome bitmap") );
1304
1305 if ( m_maskBitmap )
1306 {
1307 ::DeleteObject((HBITMAP) m_maskBitmap);
1308 m_maskBitmap = 0;
1309 }
1310
1311 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1312 bitmap.GetWidth(),
1313 bitmap.GetHeight(),
1314 1, 1, 0
1315 );
1316 HDC srcDC = CreateCompatibleDC(0);
1317 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1318 HDC destDC = CreateCompatibleDC(0);
1319 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1320 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1321 SelectObject(srcDC, 0);
1322 DeleteDC(srcDC);
1323 SelectObject(destDC, 0);
1324 DeleteDC(destDC);
1325 return TRUE;
1326 #else
1327 return FALSE;
1328 #endif
1329 }
1330
1331 // Create a mask from a bitmap and a palette index indicating
1332 // the transparent area
1333 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1334 {
1335 if ( m_maskBitmap )
1336 {
1337 ::DeleteObject((HBITMAP) m_maskBitmap);
1338 m_maskBitmap = 0;
1339 }
1340
1341 #if wxUSE_PALETTE
1342 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1343 {
1344 unsigned char red, green, blue;
1345 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1346 {
1347 wxColour transparentColour(red, green, blue);
1348 return Create(bitmap, transparentColour);
1349 }
1350 }
1351 #endif // wxUSE_PALETTE
1352
1353 return FALSE;
1354 }
1355
1356 // Create a mask from a bitmap and a colour indicating
1357 // the transparent area
1358 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1359 {
1360 #ifndef __WXMICROWIN__
1361 wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1362
1363 if ( m_maskBitmap )
1364 {
1365 ::DeleteObject((HBITMAP) m_maskBitmap);
1366 m_maskBitmap = 0;
1367 }
1368
1369 int width = bitmap.GetWidth(),
1370 height = bitmap.GetHeight();
1371
1372 // scan the bitmap for the transparent colour and set the corresponding
1373 // pixels in the mask to BLACK and the rest to WHITE
1374 COLORREF maskColour = wxColourToPalRGB(colour);
1375 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1376
1377 HDC srcDC = ::CreateCompatibleDC(NULL);
1378 HDC destDC = ::CreateCompatibleDC(NULL);
1379 if ( !srcDC || !destDC )
1380 {
1381 wxLogLastError(wxT("CreateCompatibleDC"));
1382 }
1383
1384 bool ok = TRUE;
1385
1386 // SelectObject() will fail
1387 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1388 _T("bitmap can't be selected in another DC") );
1389
1390 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1391 if ( !hbmpSrcOld )
1392 {
1393 wxLogLastError(wxT("SelectObject"));
1394
1395 ok = FALSE;
1396 }
1397
1398 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1399 if ( !hbmpDstOld )
1400 {
1401 wxLogLastError(wxT("SelectObject"));
1402
1403 ok = FALSE;
1404 }
1405
1406 if ( ok )
1407 {
1408 // this will create a monochrome bitmap with 0 points for the pixels
1409 // which have the same value as the background colour and 1 for the
1410 // others
1411 ::SetBkColor(srcDC, maskColour);
1412 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1413 }
1414
1415 ::SelectObject(srcDC, hbmpSrcOld);
1416 ::DeleteDC(srcDC);
1417 ::SelectObject(destDC, hbmpDstOld);
1418 ::DeleteDC(destDC);
1419
1420 return ok;
1421 #else // __WXMICROWIN__
1422 return FALSE;
1423 #endif // __WXMICROWIN__/!__WXMICROWIN__
1424 }
1425
1426 // ----------------------------------------------------------------------------
1427 // wxBitmapHandler
1428 // ----------------------------------------------------------------------------
1429
1430 bool wxBitmapHandler::Create(wxGDIImage *image,
1431 void *data,
1432 long flags,
1433 int width, int height, int depth)
1434 {
1435 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1436
1437 return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1438 }
1439
1440 bool wxBitmapHandler::Load(wxGDIImage *image,
1441 const wxString& name,
1442 long flags,
1443 int width, int height)
1444 {
1445 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1446
1447 return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1448 }
1449
1450 bool wxBitmapHandler::Save(wxGDIImage *image,
1451 const wxString& name,
1452 int type)
1453 {
1454 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1455
1456 return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1457 }
1458
1459 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1460 void *WXUNUSED(data),
1461 long WXUNUSED(type),
1462 int WXUNUSED(width),
1463 int WXUNUSED(height),
1464 int WXUNUSED(depth))
1465 {
1466 return FALSE;
1467 }
1468
1469 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1470 const wxString& WXUNUSED(name),
1471 long WXUNUSED(type),
1472 int WXUNUSED(desiredWidth),
1473 int WXUNUSED(desiredHeight))
1474 {
1475 return FALSE;
1476 }
1477
1478 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1479 const wxString& WXUNUSED(name),
1480 int WXUNUSED(type),
1481 const wxPalette *WXUNUSED(palette))
1482 {
1483 return FALSE;
1484 }
1485
1486 // ----------------------------------------------------------------------------
1487 // DIB functions
1488 // ----------------------------------------------------------------------------
1489
1490 #ifndef __WXMICROWIN__
1491 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1492 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1493 {
1494 unsigned long i, headerSize;
1495 LPBITMAPINFO lpDIBheader = NULL;
1496 LPPALETTEENTRY lpPe = NULL;
1497
1498
1499 // Allocate space for a DIB header
1500 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1501 lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1502 lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1503
1504 GetPaletteEntries(hPal, 0, 256, lpPe);
1505
1506 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1507
1508 // Fill in the static parts of the DIB header
1509 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1510 lpDIBheader->bmiHeader.biWidth = xSize;
1511 lpDIBheader->bmiHeader.biHeight = ySize;
1512 lpDIBheader->bmiHeader.biPlanes = 1;
1513
1514 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1515 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1516 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1517 lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1518 lpDIBheader->bmiHeader.biClrUsed = 256;
1519
1520
1521 // Initialize the DIB palette
1522 for (i = 0; i < 256; i++) {
1523 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1524 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1525 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1526 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1527 }
1528
1529 *lpDIBHeader = lpDIBheader;
1530
1531 return TRUE;
1532 }
1533
1534 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1535 {
1536 free(lpDIBHeader);
1537 }
1538 #endif
1539
1540 // ----------------------------------------------------------------------------
1541 // global helper functions implemented here
1542 // ----------------------------------------------------------------------------
1543
1544 // helper of wxBitmapToHICON/HCURSOR
1545 static
1546 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1547 bool iconWanted,
1548 int hotSpotX,
1549 int hotSpotY)
1550 {
1551 if ( !bmp.Ok() )
1552 {
1553 // we can't create an icon/cursor form nothing
1554 return 0;
1555 }
1556
1557 wxMask *mask = bmp.GetMask();
1558 if ( !mask )
1559 {
1560 // we must have a mask for an icon, so even if it's probably incorrect,
1561 // do create it (grey is the "standard" transparent colour)
1562 mask = new wxMask(bmp, *wxLIGHT_GREY);
1563 }
1564
1565 ICONINFO iconInfo;
1566 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1567 if ( !iconWanted )
1568 {
1569 iconInfo.xHotspot = hotSpotX;
1570 iconInfo.yHotspot = hotSpotY;
1571 }
1572
1573 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1574 iconInfo.hbmColor = GetHbitmapOf(bmp);
1575
1576 // black out the transparent area to preserve background colour, because
1577 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1578 // the mask to the dest rect.
1579 {
1580 MemoryHDC dcSrc, dcDst;
1581 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1582 selectBitmap(dcDst, iconInfo.hbmColor);
1583
1584 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1585 dcSrc, 0, 0, SRCAND) )
1586 {
1587 wxLogLastError(_T("BitBlt"));
1588 }
1589 }
1590
1591 HICON hicon = ::CreateIconIndirect(&iconInfo);
1592
1593 if ( !bmp.GetMask() )
1594 {
1595 // we created the mask, now delete it
1596 delete mask;
1597 }
1598
1599 // delete the inverted mask bitmap we created as well
1600 ::DeleteObject(iconInfo.hbmMask);
1601
1602 return hicon;
1603 }
1604
1605 HICON wxBitmapToHICON(const wxBitmap& bmp)
1606 {
1607 return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1608 }
1609
1610 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1611 {
1612 return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1613 }
1614
1615 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1616 {
1617 #ifndef __WXMICROWIN__
1618 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1619
1620 // get width/height from the bitmap if not given
1621 if ( !w || !h )
1622 {
1623 BITMAP bm;
1624 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1625 w = bm.bmWidth;
1626 h = bm.bmHeight;
1627 }
1628
1629 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1630 HDC hdcDst = ::CreateCompatibleDC(NULL);
1631 if ( !hdcSrc || !hdcDst )
1632 {
1633 wxLogLastError(wxT("CreateCompatibleDC"));
1634 }
1635
1636 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1637 if ( !hbmpInvMask )
1638 {
1639 wxLogLastError(wxT("CreateBitmap"));
1640 }
1641
1642 ::SelectObject(hdcSrc, hbmpMask);
1643 ::SelectObject(hdcDst, hbmpInvMask);
1644 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1645 hdcSrc, 0, 0,
1646 NOTSRCCOPY) )
1647 {
1648 wxLogLastError(wxT("BitBlt"));
1649 }
1650
1651 ::DeleteDC(hdcSrc);
1652 ::DeleteDC(hdcDst);
1653
1654 return hbmpInvMask;
1655 #else
1656 return 0;
1657 #endif
1658 }
wxWidgets (Impactor)