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fix for [ 1052989 ] TextCtrl.SetBackgroundColour(wx.NullColour) bug
[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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
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 wxUSE_WXDIB
47 #include "wx/msw/dib.h"
48 #endif
49
50 #include "wx/image.h"
51 #include "wx/xpmdecod.h"
52
53 #ifdef wxHAVE_RAW_BITMAP
54 #include "wx/rawbmp.h"
55 #endif
56
57 // missing from mingw32 header
58 #ifndef CLR_INVALID
59 #define CLR_INVALID ((COLORREF)-1)
60 #endif // no CLR_INVALID
61
62 // ----------------------------------------------------------------------------
63 // Bitmap data
64 // ----------------------------------------------------------------------------
65
66 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
67 {
68 public:
69 wxBitmapRefData();
70 wxBitmapRefData(const wxBitmapRefData& data);
71 virtual ~wxBitmapRefData() { Free(); }
72
73 virtual void Free();
74
75 // set the mask object to use as the mask, we take ownership of it
76 void SetMask(wxMask *mask)
77 {
78 delete m_bitmapMask;
79 m_bitmapMask = mask;
80 }
81
82 // set the HBITMAP to use as the mask
83 void SetMask(HBITMAP hbmpMask)
84 {
85 SetMask(new wxMask((WXHBITMAP)hbmpMask));
86 }
87
88 // return the mask
89 wxMask *GetMask() const { return m_bitmapMask; }
90
91 public:
92 #if wxUSE_PALETTE
93 wxPalette m_bitmapPalette;
94 #endif // wxUSE_PALETTE
95
96 // MSW-specific
97 // ------------
98
99 #ifdef __WXDEBUG__
100 // this field is solely for error checking: we detect selecting a bitmap
101 // into more than one DC at once or deleting a bitmap still selected into a
102 // DC (both are serious programming errors under Windows)
103 wxDC *m_selectedInto;
104 #endif // __WXDEBUG__
105
106 #if wxUSE_WXDIB
107 // when GetRawData() is called for a DDB we need to convert it to a DIB
108 // first to be able to provide direct access to it and we cache that DIB
109 // here and convert it back to DDB when UngetRawData() is called
110 wxDIB *m_dib;
111 #endif
112
113 // true if we have alpha transparency info and can be drawn using
114 // AlphaBlend()
115 bool m_hasAlpha;
116
117 // true if our HBITMAP is a DIB section, false if it is a DDB
118 bool m_isDIB;
119
120 private:
121 // optional mask for transparent drawing
122 wxMask *m_bitmapMask;
123
124
125 // not implemented
126 wxBitmapRefData& operator=(const wxBitmapRefData&);
127 };
128
129 // ----------------------------------------------------------------------------
130 // macros
131 // ----------------------------------------------------------------------------
132
133 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
134 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
135
136 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
137
138 // ============================================================================
139 // implementation
140 // ============================================================================
141
142 // ----------------------------------------------------------------------------
143 // helper functions
144 // ----------------------------------------------------------------------------
145
146 // decide whether we should create a DIB or a DDB for the given parameters
147 //
148 // NB: we always use DIBs under Windows CE as this is much simpler (even if
149 // also less efficient...) and we obviously can't use them if there is no
150 // DIB support compiled in at all
151 #ifdef __WXWINCE__
152 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
153
154 #define ALWAYS_USE_DIB
155 #elif !wxUSE_WXDIB
156 // no sense in defining wxShouldCreateDIB() as we can't compile code
157 // executed if it is true, so we have to use #if's anyhow
158 #define NEVER_USE_DIB
159 #else // wxUSE_WXDIB && !__WXWINCE__
160 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
161 {
162 // here is the logic:
163 //
164 // (a) if hdc is specified, the caller explicitly wants DDB
165 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
166 // or less DIBs anyhow)
167 // (c) finally, create DIBs under Win9x even if the depth hasn't been
168 // explicitly specified but the current display depth is 24 or
169 // more and the image is "big", i.e. > 16Mb which is the
170 // theoretical limit for DDBs under Win9x
171 //
172 // consequences (all of which seem to make sense):
173 //
174 // (i) by default, DDBs are created (depth == -1 usually)
175 // (ii) DIBs can be created by explicitly specifying the depth
176 // (iii) using a DC always forces creating a DDB
177 return !hdc &&
178 (d >= 24 ||
179 (d == -1 &&
180 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
181 }
182
183 #define SOMETIMES_USE_DIB
184 #endif // different DIB usage scenarious
185
186 // ----------------------------------------------------------------------------
187 // wxBitmapRefData
188 // ----------------------------------------------------------------------------
189
190 wxBitmapRefData::wxBitmapRefData()
191 {
192 #ifdef __WXDEBUG__
193 m_selectedInto = NULL;
194 #endif
195 m_bitmapMask = NULL;
196
197 m_hBitmap = (WXHBITMAP) NULL;
198 #if wxUSE_WXDIB
199 m_dib = NULL;
200 #endif
201
202 m_isDIB =
203 m_hasAlpha = false;
204 }
205
206 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
207 : wxGDIImageRefData(data)
208 {
209 #ifdef __WXDEBUG__
210 m_selectedInto = NULL;
211 #endif
212
213 // can't copy the mask as the other bitmap destroys it
214 m_bitmapMask = NULL;
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 // this function should be called from all wxBitmap ctors
249 void wxBitmap::Init()
250 {
251 // m_refData = NULL; done in the base class ctor
252 }
253
254 wxGDIImageRefData *wxBitmap::CreateData() const
255 {
256 return new wxBitmapRefData;
257 }
258
259 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
260 {
261 const wxBitmapRefData *
262 data = wx_static_cast(const wxBitmapRefData *, dataOrig);
263 if ( !data )
264 return NULL;
265
266 wxBitmap *self = wx_const_cast(wxBitmap *, this);
267
268 #if wxUSE_WXDIB
269 // copy the other bitmap
270 if ( data->m_hBitmap )
271 {
272 wxDIB dib((HBITMAP)(data->m_hBitmap));
273 self->CopyFromDIB(dib);
274 }
275 else
276 #endif // wxUSE_WXDIB
277 {
278 // don't copy the bitmap data, but do copy the size, depth, ...
279 self->m_refData = new wxBitmapRefData(*data);
280 }
281
282 return m_refData;
283 }
284
285 #ifdef __WIN32__
286
287 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
288 {
289 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
290 // it may be either HICON or HCURSOR
291 HICON hicon = (HICON)icon.GetHandle();
292
293 ICONINFO iconInfo;
294 if ( !::GetIconInfo(hicon, &iconInfo) )
295 {
296 wxLogLastError(wxT("GetIconInfo"));
297
298 return false;
299 }
300
301 wxBitmapRefData *refData = new wxBitmapRefData;
302 m_refData = refData;
303
304 int w = icon.GetWidth(),
305 h = icon.GetHeight();
306
307 refData->m_width = w;
308 refData->m_height = h;
309 refData->m_depth = wxDisplayDepth();
310
311 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
312
313 // the mask returned by GetIconInfo() is inversed compared to the usual
314 // wxWin convention
315 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
316
317
318 // delete the old one now as we don't need it any more
319 ::DeleteObject(iconInfo.hbmMask);
320
321 return true;
322 #else
323 wxUnusedVar(icon);
324 return false;
325 #endif
326 }
327
328 #endif // Win32
329
330 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
331 {
332 UnRef();
333
334 if ( !cursor.Ok() )
335 return false;
336
337 return CopyFromIconOrCursor(cursor);
338 }
339
340 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
341 {
342 UnRef();
343
344 if ( !icon.Ok() )
345 return false;
346
347 return CopyFromIconOrCursor(icon);
348 }
349
350 #ifndef NEVER_USE_DIB
351
352 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
353 {
354 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
355
356 #ifdef SOMETIMES_USE_DIB
357 HBITMAP hbitmap = dib.CreateDDB();
358 if ( !hbitmap )
359 return false;
360 #else // ALWAYS_USE_DIB
361 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
362 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
363
364 UnRef();
365
366 wxBitmapRefData *refData = new wxBitmapRefData;
367 m_refData = refData;
368
369 refData->m_width = dib.GetWidth();
370 refData->m_height = dib.GetHeight();
371 refData->m_depth = dib.GetDepth();
372
373 refData->m_hBitmap = (WXHBITMAP)hbitmap;
374
375 #if wxUSE_PALETTE
376 wxPalette *palette = dib.CreatePalette();
377 if ( palette )
378 {
379 refData->m_bitmapPalette = *palette;
380 }
381
382 delete palette;
383 #endif // wxUSE_PALETTE
384
385 return true;
386 }
387
388 #endif // NEVER_USE_DIB
389
390 wxBitmap::~wxBitmap()
391 {
392 }
393
394 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
395 {
396 Init();
397
398 #ifndef __WXMICROWIN__
399 wxBitmapRefData *refData = new wxBitmapRefData;
400 m_refData = refData;
401
402 refData->m_width = width;
403 refData->m_height = height;
404 refData->m_depth = depth;
405
406 char *data;
407 if ( depth == 1 )
408 {
409 // we assume that it is in XBM format which is not quite the same as
410 // the format CreateBitmap() wants because the order of bytes in the
411 // line is inversed!
412 const size_t bytesPerLine = (width + 7) / 8;
413 const size_t padding = bytesPerLine % 2;
414 const size_t len = height * ( padding + bytesPerLine );
415 data = (char *)malloc(len);
416 const char *src = bits;
417 char *dst = data;
418
419 for ( int rows = 0; rows < height; rows++ )
420 {
421 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
422 {
423 unsigned char val = *src++;
424 unsigned char reversed = 0;
425
426 for ( int bits = 0; bits < 8; bits++)
427 {
428 reversed <<= 1;
429 reversed |= (unsigned char)(val & 0x01);
430 val >>= 1;
431 }
432 *dst++ = reversed;
433 }
434
435 if ( padding )
436 *dst++ = 0;
437 }
438 }
439 else
440 {
441 // bits should already be in Windows standard format
442 data = (char *)bits; // const_cast is harmless
443 }
444
445 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
446 if ( !hbmp )
447 {
448 wxLogLastError(wxT("CreateBitmap"));
449 }
450
451 if ( data != bits )
452 {
453 free(data);
454 }
455
456 SetHBITMAP((WXHBITMAP)hbmp);
457 #endif
458 }
459
460 // Create from XPM data
461 bool wxBitmap::CreateFromXpm(const char **data)
462 {
463 #if wxUSE_IMAGE && wxUSE_XPM
464 Init();
465
466 wxCHECK_MSG( data != NULL, false, wxT("invalid bitmap data") )
467
468 wxXPMDecoder decoder;
469 wxImage img = decoder.ReadData(data);
470 wxCHECK_MSG( img.Ok(), false, wxT("invalid bitmap data") )
471
472 *this = wxBitmap(img);
473 return true;
474 #else
475 wxUnusedVar(data);
476 return false;
477 #endif
478 }
479
480 wxBitmap::wxBitmap(int w, int h, int d)
481 {
482 Init();
483
484 (void)Create(w, h, d);
485 }
486
487 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
488 {
489 Init();
490
491 (void)Create(w, h, dc);
492 }
493
494 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
495 {
496 Init();
497
498 (void)Create(data, type, width, height, depth);
499 }
500
501 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
502 {
503 Init();
504
505 LoadFile(filename, (int)type);
506 }
507
508 bool wxBitmap::Create(int width, int height, int depth)
509 {
510 return DoCreate(width, height, depth, 0);
511 }
512
513 bool wxBitmap::Create(int width, int height, const wxDC& dc)
514 {
515 wxCHECK_MSG( dc.Ok(), false, _T("invalid HDC in wxBitmap::Create()") );
516
517 return DoCreate(width, height, -1, dc.GetHDC());
518 }
519
520 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
521 {
522 UnRef();
523
524 m_refData = new wxBitmapRefData;
525
526 GetBitmapData()->m_width = w;
527 GetBitmapData()->m_height = h;
528
529 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
530
531 #ifndef NEVER_USE_DIB
532 if ( wxShouldCreateDIB(w, h, d, hdc) )
533 {
534 if ( d == -1 )
535 {
536 // create DIBs without alpha channel by default
537 d = 24;
538 }
539
540 wxDIB dib(w, h, d);
541 if ( !dib.IsOk() )
542 return false;
543
544 // don't delete the DIB section in dib object dtor
545 hbmp = dib.Detach();
546
547 GetBitmapData()->m_isDIB = true;
548 GetBitmapData()->m_depth = d;
549 }
550 else // create a DDB
551 #endif // NEVER_USE_DIB
552 {
553 #ifndef ALWAYS_USE_DIB
554 #ifndef __WXMICROWIN__
555 if ( d > 0 )
556 {
557 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
558 if ( !hbmp )
559 {
560 wxLogLastError(wxT("CreateBitmap"));
561 }
562
563 GetBitmapData()->m_depth = d;
564 }
565 else // d == 0, create bitmap compatible with the screen
566 #endif // !__WXMICROWIN__
567 {
568 ScreenHDC dc;
569 hbmp = ::CreateCompatibleBitmap(dc, w, h);
570 if ( !hbmp )
571 {
572 wxLogLastError(wxT("CreateCompatibleBitmap"));
573 }
574
575 GetBitmapData()->m_depth = wxDisplayDepth();
576 }
577 #endif // !ALWAYS_USE_DIB
578 }
579
580 SetHBITMAP((WXHBITMAP)hbmp);
581
582 return Ok();
583 }
584
585 #if wxUSE_IMAGE
586
587 // ----------------------------------------------------------------------------
588 // wxImage to/from conversions for Microwin
589 // ----------------------------------------------------------------------------
590
591 // Microwin versions are so different from normal ones that it really doesn't
592 // make sense to use #ifdefs inside the function bodies
593 #ifdef __WXMICROWIN__
594
595 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
596 {
597 // Set this to 1 to experiment with mask code,
598 // which currently doesn't work
599 #define USE_MASKS 0
600
601 m_refData = new wxBitmapRefData();
602
603 // Initial attempt at a simple-minded implementation.
604 // The bitmap will always be created at the screen depth,
605 // so the 'depth' argument is ignored.
606
607 HDC hScreenDC = ::GetDC(NULL);
608 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
609
610 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
611 HBITMAP hMaskBitmap = NULL;
612 HBITMAP hOldMaskBitmap = NULL;
613 HDC hMaskDC = NULL;
614 unsigned char maskR = 0;
615 unsigned char maskG = 0;
616 unsigned char maskB = 0;
617
618 // printf("Created bitmap %d\n", (int) hBitmap);
619 if (hBitmap == NULL)
620 {
621 ::ReleaseDC(NULL, hScreenDC);
622 return false;
623 }
624 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
625
626 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
627 ::ReleaseDC(NULL, hScreenDC);
628
629 // created an mono-bitmap for the possible mask
630 bool hasMask = image.HasMask();
631
632 if ( hasMask )
633 {
634 #if USE_MASKS
635 // FIXME: we should be able to pass bpp = 1, but
636 // GdBlit can't handle a different depth
637 #if 0
638 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
639 #else
640 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
641 #endif
642 maskR = image.GetMaskRed();
643 maskG = image.GetMaskGreen();
644 maskB = image.GetMaskBlue();
645
646 if (!hMaskBitmap)
647 {
648 hasMask = false;
649 }
650 else
651 {
652 hScreenDC = ::GetDC(NULL);
653 hMaskDC = ::CreateCompatibleDC(hScreenDC);
654 ::ReleaseDC(NULL, hScreenDC);
655
656 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
657 }
658 #else
659 hasMask = false;
660 #endif
661 }
662
663 int i, j;
664 for (i = 0; i < image.GetWidth(); i++)
665 {
666 for (j = 0; j < image.GetHeight(); j++)
667 {
668 unsigned char red = image.GetRed(i, j);
669 unsigned char green = image.GetGreen(i, j);
670 unsigned char blue = image.GetBlue(i, j);
671
672 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
673
674 if (hasMask)
675 {
676 // scan the bitmap for the transparent colour and set the corresponding
677 // pixels in the mask to BLACK and the rest to WHITE
678 if (maskR == red && maskG == green && maskB == blue)
679 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
680 else
681 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
682 }
683 }
684 }
685
686 ::SelectObject(hMemDC, hOldBitmap);
687 ::DeleteDC(hMemDC);
688 if (hasMask)
689 {
690 ::SelectObject(hMaskDC, hOldMaskBitmap);
691 ::DeleteDC(hMaskDC);
692
693 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
694 }
695
696 SetWidth(image.GetWidth());
697 SetHeight(image.GetHeight());
698 SetDepth(screenDepth);
699 SetHBITMAP( (WXHBITMAP) hBitmap );
700
701 #if wxUSE_PALETTE
702 // Copy the palette from the source image
703 SetPalette(image.GetPalette());
704 #endif // wxUSE_PALETTE
705
706 return true;
707 }
708
709 wxImage wxBitmap::ConvertToImage() const
710 {
711 // Initial attempt at a simple-minded implementation.
712 // The bitmap will always be created at the screen depth,
713 // so the 'depth' argument is ignored.
714 // TODO: transparency (create a mask image)
715
716 if (!Ok())
717 {
718 wxFAIL_MSG( wxT("bitmap is invalid") );
719 return wxNullImage;
720 }
721
722 wxImage image;
723
724 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
725
726 // create an wxImage object
727 int width = GetWidth();
728 int height = GetHeight();
729 image.Create( width, height );
730 unsigned char *data = image.GetData();
731 if( !data )
732 {
733 wxFAIL_MSG( wxT("could not allocate data for image") );
734 return wxNullImage;
735 }
736
737 HDC hScreenDC = ::GetDC(NULL);
738
739 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
740 ::ReleaseDC(NULL, hScreenDC);
741
742 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
743
744 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
745
746 int i, j;
747 for (i = 0; i < GetWidth(); i++)
748 {
749 for (j = 0; j < GetHeight(); j++)
750 {
751 COLORREF color = ::GetPixel(hMemDC, i, j);
752 unsigned char red = GetRValue(color);
753 unsigned char green = GetGValue(color);
754 unsigned char blue = GetBValue(color);
755
756 image.SetRGB(i, j, red, green, blue);
757 }
758 }
759
760 ::SelectObject(hMemDC, hOldBitmap);
761 ::DeleteDC(hMemDC);
762
763 #if wxUSE_PALETTE
764 // Copy the palette from the source image
765 if (GetPalette())
766 image.SetPalette(* GetPalette());
767 #endif // wxUSE_PALETTE
768
769 return image;
770 }
771
772 #endif // __WXMICROWIN__
773
774 // ----------------------------------------------------------------------------
775 // wxImage to/from conversions
776 // ----------------------------------------------------------------------------
777
778 #if wxUSE_WXDIB
779
780 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
781 {
782 return CreateFromImage(image, depth, 0);
783 }
784
785 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
786 {
787 wxCHECK_MSG( dc.Ok(), false,
788 _T("invalid HDC in wxBitmap::CreateFromImage()") );
789
790 return CreateFromImage(image, -1, dc.GetHDC());
791 }
792
793 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
794 {
795 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
796
797 UnRef();
798
799 // first convert the image to DIB
800 const int h = image.GetHeight();
801 const int w = image.GetWidth();
802
803 wxDIB dib(image);
804 if ( !dib.IsOk() )
805 return false;
806
807
808 // store the bitmap parameters
809 wxBitmapRefData *refData = new wxBitmapRefData;
810 refData->m_width = w;
811 refData->m_height = h;
812 refData->m_hasAlpha = image.HasAlpha();
813
814 m_refData = refData;
815
816
817 // next either store DIB as is or create a DDB from it
818 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
819
820 // are we going to use DIB?
821 //
822 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
823 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
824 {
825 // don't delete the DIB section in dib object dtor
826 hbitmap = dib.Detach();
827
828 refData->m_isDIB = true;
829 refData->m_depth = dib.GetDepth();
830 }
831 #ifndef ALWAYS_USE_DIB
832 else // we need to convert DIB to DDB
833 {
834 hbitmap = dib.CreateDDB((HDC)hdc);
835
836 refData->m_depth = depth == -1 ? dib.GetDepth() : depth;
837 }
838 #endif // !ALWAYS_USE_DIB
839
840 // validate this object
841 SetHBITMAP((WXHBITMAP)hbitmap);
842
843 // finally also set the mask if we have one
844 if ( image.HasMask() )
845 {
846 SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
847 image.GetMaskGreen(),
848 image.GetMaskBlue())));
849 }
850
851 return true;
852 }
853
854 wxImage wxBitmap::ConvertToImage() const
855 {
856 // convert DDB to DIB
857 wxDIB dib(*this);
858
859 if ( !dib.IsOk() )
860 {
861 return wxNullImage;
862 }
863
864 // and then DIB to our wxImage
865 wxImage image = dib.ConvertToImage();
866 if ( !image.Ok() )
867 {
868 return wxNullImage;
869 }
870
871 // now do the same for the mask, if we have any
872 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
873 if ( hbmpMask )
874 {
875 wxDIB dibMask(hbmpMask);
876 if ( dibMask.IsOk() )
877 {
878 // TODO: use wxRawBitmap to iterate over DIB
879
880 // we hard code the mask colour for now but we could also make an
881 // effort (and waste time) to choose a colour not present in the
882 // image already to avoid having to fudge the pixels below --
883 // whether it's worth to do it is unclear however
884 static const int MASK_RED = 1;
885 static const int MASK_GREEN = 2;
886 static const int MASK_BLUE = 3;
887 static const int MASK_BLUE_REPLACEMENT = 2;
888
889 const int h = dibMask.GetHeight();
890 const int w = dibMask.GetWidth();
891 const int bpp = dibMask.GetDepth();
892 const int maskBytesPerPixel = bpp >> 3;
893 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
894 unsigned char *data = image.GetData();
895
896 // remember that DIBs are stored in bottom to top order
897 unsigned char *
898 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
899
900 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
901 {
902 // traverse one mask DIB line
903 unsigned char *mask = maskLineStart;
904 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
905 {
906 // should this pixel be transparent?
907 if ( *mask )
908 {
909 // no, check that it isn't transparent by accident
910 if ( (data[0] == MASK_RED) &&
911 (data[1] == MASK_GREEN) &&
912 (data[2] == MASK_BLUE) )
913 {
914 // we have to fudge the colour a bit to prevent
915 // this pixel from appearing transparent
916 data[2] = MASK_BLUE_REPLACEMENT;
917 }
918
919 data += 3;
920 }
921 else // yes, transparent pixel
922 {
923 *data++ = MASK_RED;
924 *data++ = MASK_GREEN;
925 *data++ = MASK_BLUE;
926 }
927 }
928 }
929
930 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
931 }
932 }
933
934 return image;
935 }
936
937 #endif // wxUSE_WXDIB
938
939 #endif // wxUSE_IMAGE
940
941 // ----------------------------------------------------------------------------
942 // loading and saving bitmaps
943 // ----------------------------------------------------------------------------
944
945 bool wxBitmap::LoadFile(const wxString& filename, long type)
946 {
947 UnRef();
948
949 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
950
951 if ( handler )
952 {
953 m_refData = new wxBitmapRefData;
954
955 return handler->LoadFile(this, filename, type, -1, -1);
956 }
957 #if wxUSE_IMAGE
958 else // no bitmap handler found
959 {
960 wxImage image;
961 if ( image.LoadFile( filename, type ) && image.Ok() )
962 {
963 *this = wxBitmap(image);
964
965 return true;
966 }
967 }
968 #endif // wxUSE_IMAGE
969
970 return false;
971 }
972
973 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
974 {
975 UnRef();
976
977 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
978
979 if ( !handler )
980 {
981 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
982
983 return false;
984 }
985
986 m_refData = new wxBitmapRefData;
987
988 return handler->Create(this, data, type, width, height, depth);
989 }
990
991 bool wxBitmap::SaveFile(const wxString& filename,
992 int type,
993 const wxPalette *palette)
994 {
995 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
996
997 if ( handler )
998 {
999 return handler->SaveFile(this, filename, type, palette);
1000 }
1001 #if wxUSE_IMAGE
1002 else // no bitmap handler found
1003 {
1004 // FIXME what about palette? shouldn't we use it?
1005 wxImage image = ConvertToImage();
1006 if ( image.Ok() )
1007 {
1008 return image.SaveFile(filename, type);
1009 }
1010 }
1011 #endif // wxUSE_IMAGE
1012
1013 return false;
1014 }
1015
1016 // ----------------------------------------------------------------------------
1017 // sub bitmap extraction
1018 // ----------------------------------------------------------------------------
1019
1020 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1021 {
1022 wxCHECK_MSG( Ok() &&
1023 (rect.x >= 0) && (rect.y >= 0) &&
1024 (rect.x+rect.width <= GetWidth()) &&
1025 (rect.y+rect.height <= GetHeight()),
1026 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1027
1028 wxBitmap ret( rect.width, rect.height, GetDepth() );
1029 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1030
1031 #ifndef __WXMICROWIN__
1032 // handle alpha channel, if any
1033 if (HasAlpha())
1034 ret.UseAlpha();
1035
1036 // copy bitmap data
1037 MemoryHDC dcSrc,
1038 dcDst;
1039
1040 {
1041 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1042 selectDst(dcDst, GetHbitmapOf(ret));
1043
1044 if ( !selectSrc || !selectDst )
1045 {
1046 wxLogLastError(_T("SelectObjct(hBitmap)"));
1047 }
1048
1049 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1050 dcSrc, rect.x, rect.y, SRCCOPY) )
1051 {
1052 wxLogLastError(_T("BitBlt"));
1053 }
1054 }
1055
1056 // copy mask if there is one
1057 if ( GetMask() )
1058 {
1059 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1060
1061 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1062 selectDst(dcDst, hbmpMask);
1063
1064 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1065 dcSrc, rect.x, rect.y, SRCCOPY) )
1066 {
1067 wxLogLastError(_T("BitBlt"));
1068 }
1069
1070 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1071 ret.SetMask(mask);
1072 }
1073 #endif // !__WXMICROWIN__
1074
1075 return ret;
1076 }
1077
1078 // ----------------------------------------------------------------------------
1079 // wxBitmap accessors
1080 // ----------------------------------------------------------------------------
1081
1082 #if wxUSE_PALETTE
1083 wxPalette* wxBitmap::GetPalette() const
1084 {
1085 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1086 : (wxPalette *) NULL;
1087 }
1088 #endif
1089
1090 wxMask *wxBitmap::GetMask() const
1091 {
1092 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1093 }
1094
1095 #ifdef __WXDEBUG__
1096
1097 wxDC *wxBitmap::GetSelectedInto() const
1098 {
1099 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1100 }
1101
1102 #endif
1103
1104 #if WXWIN_COMPATIBILITY_2_4
1105
1106 int wxBitmap::GetQuality() const
1107 {
1108 return 0;
1109 }
1110
1111 #endif // WXWIN_COMPATIBILITY_2_4
1112
1113 void wxBitmap::UseAlpha()
1114 {
1115 if ( GetBitmapData() )
1116 GetBitmapData()->m_hasAlpha = true;
1117 }
1118
1119 bool wxBitmap::HasAlpha() const
1120 {
1121 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1122 }
1123
1124 // ----------------------------------------------------------------------------
1125 // wxBitmap setters
1126 // ----------------------------------------------------------------------------
1127
1128 #ifdef __WXDEBUG__
1129
1130 void wxBitmap::SetSelectedInto(wxDC *dc)
1131 {
1132 if ( GetBitmapData() )
1133 GetBitmapData()->m_selectedInto = dc;
1134 }
1135
1136 #endif
1137
1138 #if wxUSE_PALETTE
1139
1140 void wxBitmap::SetPalette(const wxPalette& palette)
1141 {
1142 AllocExclusive();
1143
1144 GetBitmapData()->m_bitmapPalette = palette;
1145 }
1146
1147 #endif // wxUSE_PALETTE
1148
1149 void wxBitmap::SetMask(wxMask *mask)
1150 {
1151 AllocExclusive();
1152
1153 GetBitmapData()->SetMask(mask);
1154 }
1155
1156 #if WXWIN_COMPATIBILITY_2_4
1157
1158 void wxBitmap::SetQuality(int WXUNUSED(quality))
1159 {
1160 }
1161
1162 #endif // WXWIN_COMPATIBILITY_2_4
1163
1164 // ----------------------------------------------------------------------------
1165 // raw bitmap access support
1166 // ----------------------------------------------------------------------------
1167
1168 #ifdef wxHAVE_RAW_BITMAP
1169 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1170 {
1171 #if wxUSE_WXDIB
1172 if ( !Ok() )
1173 {
1174 // no bitmap, no data (raw or otherwise)
1175 return NULL;
1176 }
1177
1178 // if we're already a DIB we can access our data directly, but if not we
1179 // need to convert this DDB to a DIB section and use it for raw access and
1180 // then convert it back
1181 HBITMAP hDIB;
1182 if ( !GetBitmapData()->m_isDIB )
1183 {
1184 wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
1185 _T("GetRawData() may be called only once") );
1186
1187 wxDIB *dib = new wxDIB(*this);
1188 if ( !dib->IsOk() )
1189 {
1190 delete dib;
1191
1192 return NULL;
1193 }
1194
1195 // we'll free it in UngetRawData()
1196 GetBitmapData()->m_dib = dib;
1197
1198 hDIB = dib->GetHandle();
1199 }
1200 else // we're a DIB
1201 {
1202 hDIB = GetHbitmap();
1203 }
1204
1205 DIBSECTION ds;
1206 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1207 {
1208 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1209
1210 return NULL;
1211 }
1212
1213 // check that the bitmap is in correct format
1214 if ( ds.dsBm.bmBitsPixel != bpp )
1215 {
1216 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1217
1218 return NULL;
1219 }
1220
1221 // ok, store the relevant info in wxPixelDataBase
1222 const LONG h = ds.dsBm.bmHeight;
1223
1224 data.m_width = ds.dsBm.bmWidth;
1225 data.m_height = h;
1226
1227 // remember that DIBs are stored in top to bottom order!
1228 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1229 // multiple of 2, as required by the documentation. So we use the official
1230 // formula, which we already use elsewhere.)
1231 const LONG bytesPerRow =
1232 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1233 data.m_stride = -bytesPerRow;
1234
1235 char *bits = (char *)ds.dsBm.bmBits;
1236 if ( h > 1 )
1237 {
1238 bits += (h - 1)*bytesPerRow;
1239 }
1240
1241 return bits;
1242 #else
1243 return NULL;
1244 #endif
1245 }
1246
1247 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1248 {
1249 #if wxUSE_WXDIB
1250 if ( !Ok() )
1251 return;
1252
1253 if ( !&dataBase )
1254 {
1255 // invalid data, don't crash -- but don't assert neither as we're
1256 // called automatically from wxPixelDataBase dtor and so there is no
1257 // way to prevent this from happening
1258 return;
1259 }
1260
1261 // if we're a DDB we need to convert DIB back to DDB now to make the
1262 // changes made via raw bitmap access effective
1263 if ( !GetBitmapData()->m_isDIB )
1264 {
1265 wxDIB *dib = GetBitmapData()->m_dib;
1266 GetBitmapData()->m_dib = NULL;
1267
1268 // TODO: convert
1269
1270 delete dib;
1271 }
1272 #endif // wxUSE_WXDIB
1273 }
1274 #endif // #ifdef wxHAVE_RAW_BITMAP
1275
1276 // ----------------------------------------------------------------------------
1277 // wxMask
1278 // ----------------------------------------------------------------------------
1279
1280 wxMask::wxMask()
1281 {
1282 m_maskBitmap = 0;
1283 }
1284
1285 // Construct a mask from a bitmap and a colour indicating
1286 // the transparent area
1287 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1288 {
1289 m_maskBitmap = 0;
1290 Create(bitmap, colour);
1291 }
1292
1293 // Construct a mask from a bitmap and a palette index indicating
1294 // the transparent area
1295 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1296 {
1297 m_maskBitmap = 0;
1298 Create(bitmap, paletteIndex);
1299 }
1300
1301 // Construct a mask from a mono bitmap (copies the bitmap).
1302 wxMask::wxMask(const wxBitmap& bitmap)
1303 {
1304 m_maskBitmap = 0;
1305 Create(bitmap);
1306 }
1307
1308 wxMask::~wxMask()
1309 {
1310 if ( m_maskBitmap )
1311 ::DeleteObject((HBITMAP) m_maskBitmap);
1312 }
1313
1314 // Create a mask from a mono bitmap (copies the bitmap).
1315 bool wxMask::Create(const wxBitmap& bitmap)
1316 {
1317 #ifndef __WXMICROWIN__
1318 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1319 _T("can't create mask from invalid or not monochrome bitmap") );
1320
1321 if ( m_maskBitmap )
1322 {
1323 ::DeleteObject((HBITMAP) m_maskBitmap);
1324 m_maskBitmap = 0;
1325 }
1326
1327 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1328 bitmap.GetWidth(),
1329 bitmap.GetHeight(),
1330 1, 1, 0
1331 );
1332 HDC srcDC = CreateCompatibleDC(0);
1333 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1334 HDC destDC = CreateCompatibleDC(0);
1335 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1336 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1337 SelectObject(srcDC, 0);
1338 DeleteDC(srcDC);
1339 SelectObject(destDC, 0);
1340 DeleteDC(destDC);
1341 return true;
1342 #else
1343 wxUnusedVar(bitmap);
1344 return false;
1345 #endif
1346 }
1347
1348 // Create a mask from a bitmap and a palette index indicating
1349 // the transparent area
1350 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1351 {
1352 if ( m_maskBitmap )
1353 {
1354 ::DeleteObject((HBITMAP) m_maskBitmap);
1355 m_maskBitmap = 0;
1356 }
1357
1358 #if wxUSE_PALETTE
1359 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1360 {
1361 unsigned char red, green, blue;
1362 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1363 {
1364 wxColour transparentColour(red, green, blue);
1365 return Create(bitmap, transparentColour);
1366 }
1367 }
1368 #endif // wxUSE_PALETTE
1369
1370 return false;
1371 }
1372
1373 // Create a mask from a bitmap and a colour indicating
1374 // the transparent area
1375 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1376 {
1377 #ifndef __WXMICROWIN__
1378 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1379
1380 if ( m_maskBitmap )
1381 {
1382 ::DeleteObject((HBITMAP) m_maskBitmap);
1383 m_maskBitmap = 0;
1384 }
1385
1386 int width = bitmap.GetWidth(),
1387 height = bitmap.GetHeight();
1388
1389 // scan the bitmap for the transparent colour and set the corresponding
1390 // pixels in the mask to BLACK and the rest to WHITE
1391 COLORREF maskColour = wxColourToPalRGB(colour);
1392 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1393
1394 HDC srcDC = ::CreateCompatibleDC(NULL);
1395 HDC destDC = ::CreateCompatibleDC(NULL);
1396 if ( !srcDC || !destDC )
1397 {
1398 wxLogLastError(wxT("CreateCompatibleDC"));
1399 }
1400
1401 bool ok = true;
1402
1403 // SelectObject() will fail
1404 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1405 _T("bitmap can't be selected in another DC") );
1406
1407 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1408 if ( !hbmpSrcOld )
1409 {
1410 wxLogLastError(wxT("SelectObject"));
1411
1412 ok = false;
1413 }
1414
1415 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1416 if ( !hbmpDstOld )
1417 {
1418 wxLogLastError(wxT("SelectObject"));
1419
1420 ok = false;
1421 }
1422
1423 if ( ok )
1424 {
1425 // this will create a monochrome bitmap with 0 points for the pixels
1426 // which have the same value as the background colour and 1 for the
1427 // others
1428 ::SetBkColor(srcDC, maskColour);
1429 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1430 }
1431
1432 ::SelectObject(srcDC, hbmpSrcOld);
1433 ::DeleteDC(srcDC);
1434 ::SelectObject(destDC, hbmpDstOld);
1435 ::DeleteDC(destDC);
1436
1437 return ok;
1438 #else // __WXMICROWIN__
1439 wxUnusedVar(bitmap);
1440 wxUnusedVar(colour);
1441 return false;
1442 #endif // __WXMICROWIN__/!__WXMICROWIN__
1443 }
1444
1445 // ----------------------------------------------------------------------------
1446 // wxBitmapHandler
1447 // ----------------------------------------------------------------------------
1448
1449 bool wxBitmapHandler::Create(wxGDIImage *image,
1450 void *data,
1451 long flags,
1452 int width, int height, int depth)
1453 {
1454 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1455
1456 return bitmap ? Create(bitmap, data, flags, width, height, depth) : false;
1457 }
1458
1459 bool wxBitmapHandler::Load(wxGDIImage *image,
1460 const wxString& name,
1461 long flags,
1462 int width, int height)
1463 {
1464 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1465
1466 return bitmap ? LoadFile(bitmap, name, flags, width, height) : false;
1467 }
1468
1469 bool wxBitmapHandler::Save(wxGDIImage *image,
1470 const wxString& name,
1471 int type)
1472 {
1473 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1474
1475 return bitmap ? SaveFile(bitmap, name, type) : false;
1476 }
1477
1478 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1479 void *WXUNUSED(data),
1480 long WXUNUSED(type),
1481 int WXUNUSED(width),
1482 int WXUNUSED(height),
1483 int WXUNUSED(depth))
1484 {
1485 return false;
1486 }
1487
1488 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1489 const wxString& WXUNUSED(name),
1490 long WXUNUSED(type),
1491 int WXUNUSED(desiredWidth),
1492 int WXUNUSED(desiredHeight))
1493 {
1494 return false;
1495 }
1496
1497 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1498 const wxString& WXUNUSED(name),
1499 int WXUNUSED(type),
1500 const wxPalette *WXUNUSED(palette))
1501 {
1502 return false;
1503 }
1504
1505 // ----------------------------------------------------------------------------
1506 // DIB functions
1507 // ----------------------------------------------------------------------------
1508
1509 #ifndef __WXMICROWIN__
1510 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1511 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1512 {
1513 unsigned long i, headerSize;
1514
1515 // Allocate space for a DIB header
1516 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1517 LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1518 LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1519
1520 GetPaletteEntries(hPal, 0, 256, lpPe);
1521
1522 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1523
1524 // Fill in the static parts of the DIB header
1525 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1526 lpDIBheader->bmiHeader.biWidth = xSize;
1527 lpDIBheader->bmiHeader.biHeight = ySize;
1528 lpDIBheader->bmiHeader.biPlanes = 1;
1529
1530 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1531 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1532 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1533 lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1534 lpDIBheader->bmiHeader.biClrUsed = 256;
1535
1536
1537 // Initialize the DIB palette
1538 for (i = 0; i < 256; i++) {
1539 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1540 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1541 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1542 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1543 }
1544
1545 *lpDIBHeader = lpDIBheader;
1546
1547 return true;
1548 }
1549
1550 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1551 {
1552 free(lpDIBHeader);
1553 }
1554 #endif
1555
1556 // ----------------------------------------------------------------------------
1557 // global helper functions implemented here
1558 // ----------------------------------------------------------------------------
1559
1560 // helper of wxBitmapToHICON/HCURSOR
1561 static
1562 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1563 bool iconWanted,
1564 int hotSpotX,
1565 int hotSpotY)
1566 {
1567 if ( !bmp.Ok() )
1568 {
1569 // we can't create an icon/cursor form nothing
1570 return 0;
1571 }
1572
1573 wxMask *mask = bmp.GetMask();
1574 if ( !mask )
1575 {
1576 // we must have a mask for an icon, so even if it's probably incorrect,
1577 // do create it (grey is the "standard" transparent colour)
1578 mask = new wxMask(bmp, *wxLIGHT_GREY);
1579 }
1580
1581 ICONINFO iconInfo;
1582 wxZeroMemory(iconInfo);
1583 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1584 if ( !iconWanted )
1585 {
1586 iconInfo.xHotspot = hotSpotX;
1587 iconInfo.yHotspot = hotSpotY;
1588 }
1589
1590 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1591 iconInfo.hbmColor = GetHbitmapOf(bmp);
1592
1593 // black out the transparent area to preserve background colour, because
1594 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1595 // the mask to the dest rect.
1596 {
1597 MemoryHDC dcSrc, dcDst;
1598 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1599 selectBitmap(dcDst, iconInfo.hbmColor);
1600
1601 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1602 dcSrc, 0, 0, SRCAND) )
1603 {
1604 wxLogLastError(_T("BitBlt"));
1605 }
1606 }
1607
1608 HICON hicon = ::CreateIconIndirect(&iconInfo);
1609
1610 if ( !bmp.GetMask() )
1611 {
1612 // we created the mask, now delete it
1613 delete mask;
1614 }
1615
1616 // delete the inverted mask bitmap we created as well
1617 ::DeleteObject(iconInfo.hbmMask);
1618
1619 return hicon;
1620 }
1621
1622 HICON wxBitmapToHICON(const wxBitmap& bmp)
1623 {
1624 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1625 }
1626
1627 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1628 {
1629 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1630 }
1631
1632 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1633 {
1634 #ifndef __WXMICROWIN__
1635 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1636
1637 // get width/height from the bitmap if not given
1638 if ( !w || !h )
1639 {
1640 BITMAP bm;
1641 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1642 w = bm.bmWidth;
1643 h = bm.bmHeight;
1644 }
1645
1646 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1647 HDC hdcDst = ::CreateCompatibleDC(NULL);
1648 if ( !hdcSrc || !hdcDst )
1649 {
1650 wxLogLastError(wxT("CreateCompatibleDC"));
1651 }
1652
1653 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1654 if ( !hbmpInvMask )
1655 {
1656 wxLogLastError(wxT("CreateBitmap"));
1657 }
1658
1659 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1660 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1661 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1662 hdcSrc, 0, 0,
1663 NOTSRCCOPY) )
1664 {
1665 wxLogLastError(wxT("BitBlt"));
1666 }
1667
1668 // Deselect objects
1669 SelectObject(hdcSrc,srcTmp);
1670 SelectObject(hdcDst,dstTmp);
1671
1672 ::DeleteDC(hdcSrc);
1673 ::DeleteDC(hdcDst);
1674
1675 return hbmpInvMask;
1676 #else
1677 return 0;
1678 #endif
1679 }
wxWidgets (Impactor)