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[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 #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 virtual ~wxBitmapRefData() { Free(); }
71
72 virtual void Free();
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 #ifdef __WXDEBUG__
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__
104
105 // when GetRawData() is called for a DDB we need to convert it to a DIB
106 // first to be able to provide direct access to it and we cache that DIB
107 // here and convert it back to DDB when UngetRawData() is called
108 wxDIB *m_dib;
109
110 // true if we have alpha transparency info and can be drawn using
111 // AlphaBlend()
112 bool m_hasAlpha;
113
114 // true if our HBITMAP is a DIB section, false if it is a DDB
115 bool m_isDIB;
116
117 private:
118 // optional mask for transparent drawing
119 wxMask *m_bitmapMask;
120
121 DECLARE_NO_COPY_CLASS(wxBitmapRefData)
122 };
123
124 // ----------------------------------------------------------------------------
125 // macros
126 // ----------------------------------------------------------------------------
127
128 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
129 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
130
131 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
132
133 // ============================================================================
134 // implementation
135 // ============================================================================
136
137 // ----------------------------------------------------------------------------
138 // helper functions
139 // ----------------------------------------------------------------------------
140
141 // decide whether we should create a DIB or a DDB for the given parameters
142 static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
143 {
144 // here is the logic:
145 //
146 // (a) if hdc is specified, the caller explicitly wants DDB
147 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
148 // less DIBs anyhow)
149 // (c) finally, create DIBs under Win9x even if the depth hasn't been
150 // explicitly specified but the current display depth is 24 or more
151 // and the image is "big", i.e. > 16Mb which is the theoretical limit
152 // for DDBs under Win9x
153 //
154 // consequences (all of which seem to make sense):
155 //
156 // (i) by default, DDBs are created (depth == -1 usually)
157 // (ii) DIBs can be created by explicitly specifying the depth
158 // (iii) using a DC always forces creating a DDB
159 return !hdc &&
160 (d >= 24 ||
161 (d == -1 &&
162 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
163 }
164
165 // ----------------------------------------------------------------------------
166 // wxBitmapRefData
167 // ----------------------------------------------------------------------------
168
169 wxBitmapRefData::wxBitmapRefData()
170 {
171 #ifdef __WXDEBUG__
172 m_selectedInto = NULL;
173 #endif
174 m_bitmapMask = NULL;
175
176 m_hBitmap = (WXHBITMAP) NULL;
177 m_dib = NULL;
178
179 m_isDIB =
180 m_hasAlpha = FALSE;
181 }
182
183 void wxBitmapRefData::Free()
184 {
185 wxASSERT_MSG( !m_selectedInto,
186 wxT("deleting bitmap still selected into wxMemoryDC") );
187
188 wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
189
190 if ( m_hBitmap)
191 {
192 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
193 {
194 wxLogLastError(wxT("DeleteObject(hbitmap)"));
195 }
196 }
197
198 delete m_bitmapMask;
199 m_bitmapMask = NULL;
200 }
201
202 // ----------------------------------------------------------------------------
203 // wxBitmap creation
204 // ----------------------------------------------------------------------------
205
206 // this function should be called from all wxBitmap ctors
207 void wxBitmap::Init()
208 {
209 // m_refData = NULL; done in the base class ctor
210 }
211
212 wxGDIImageRefData *wxBitmap::CreateData() const
213 {
214 return new wxBitmapRefData;
215 }
216
217 #ifdef __WIN32__
218
219 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
220 {
221 #ifndef __WXMICROWIN__
222 // it may be either HICON or HCURSOR
223 HICON hicon = (HICON)icon.GetHandle();
224
225 ICONINFO iconInfo;
226 if ( !::GetIconInfo(hicon, &iconInfo) )
227 {
228 wxLogLastError(wxT("GetIconInfo"));
229
230 return FALSE;
231 }
232
233 wxBitmapRefData *refData = new wxBitmapRefData;
234 m_refData = refData;
235
236 int w = icon.GetWidth(),
237 h = icon.GetHeight();
238
239 refData->m_width = w;
240 refData->m_height = h;
241 refData->m_depth = wxDisplayDepth();
242
243 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
244
245 // the mask returned by GetIconInfo() is inversed compared to the usual
246 // wxWin convention
247 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
248
249
250 // delete the old one now as we don't need it any more
251 ::DeleteObject(iconInfo.hbmMask);
252
253 #if WXWIN_COMPATIBILITY_2
254 refData->m_ok = TRUE;
255 #endif // WXWIN_COMPATIBILITY_2
256
257 return TRUE;
258 #else
259 return FALSE;
260 #endif
261 }
262
263 #endif // Win32
264
265 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
266 {
267 UnRef();
268
269 if ( !cursor.Ok() )
270 return FALSE;
271
272 #ifdef __WIN16__
273 wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
274
275 return FALSE;
276 #else
277 return CopyFromIconOrCursor(cursor);
278 #endif // Win16
279 }
280
281 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
282 {
283 UnRef();
284
285 if ( !icon.Ok() )
286 return FALSE;
287
288 // GetIconInfo() doesn't exist under Win16 and I don't know any other way
289 // to create a bitmap from icon there - but using this way we won't have
290 // the mask (FIXME)
291 #ifdef __WIN16__
292 int width = icon.GetWidth(),
293 height = icon.GetHeight();
294
295 // copy the icon to the bitmap
296 ScreenHDC hdcScreen;
297 HDC hdc = ::CreateCompatibleDC(hdcScreen);
298 HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
299 HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
300
301 ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
302
303 ::SelectObject(hdc, hbmpOld);
304 ::DeleteDC(hdc);
305
306 wxBitmapRefData *refData = new wxBitmapRefData;
307 m_refData = refData;
308
309 refData->m_width = width;
310 refData->m_height = height;
311 refData->m_depth = wxDisplayDepth();
312
313 refData->m_hBitmap = (WXHBITMAP)hbitmap;
314
315 #if WXWIN_COMPATIBILITY_2
316 refData->m_ok = TRUE;
317 #endif // WXWIN_COMPATIBILITY_2
318
319 return TRUE;
320 #else // Win32
321 return CopyFromIconOrCursor(icon);
322 #endif // Win16/Win32
323 }
324
325 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
326 {
327 wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
328
329 HBITMAP hbitmap = dib.CreateDDB();
330 if ( !hbitmap )
331 return FALSE;
332
333 UnRef();
334
335 wxBitmapRefData *refData = new wxBitmapRefData;
336 m_refData = refData;
337
338 refData->m_width = dib.GetWidth();
339 refData->m_height = dib.GetHeight();
340 refData->m_depth = dib.GetDepth();
341
342 refData->m_hBitmap = (WXHBITMAP)hbitmap;
343
344 #if wxUSE_PALETTE
345 wxPalette *palette = dib.CreatePalette();
346 if ( palette )
347 {
348 refData->m_bitmapPalette = *palette;
349 }
350
351 delete palette;
352 #endif // wxUSE_PALETTE
353
354 return TRUE;
355 }
356
357 wxBitmap::~wxBitmap()
358 {
359 }
360
361 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
362 {
363 Init();
364
365 #ifndef __WXMICROWIN__
366 wxBitmapRefData *refData = new wxBitmapRefData;
367 m_refData = refData;
368
369 refData->m_width = width;
370 refData->m_height = height;
371 refData->m_depth = depth;
372
373 char *data;
374 if ( depth == 1 )
375 {
376 // we assume that it is in XBM format which is not quite the same as
377 // the format CreateBitmap() wants because the order of bytes in the
378 // line is inversed!
379 const size_t bytesPerLine = (width + 7) / 8;
380 const size_t padding = bytesPerLine % 2;
381 const size_t len = height * ( padding + bytesPerLine );
382 data = (char *)malloc(len);
383 const char *src = bits;
384 char *dst = data;
385
386 for ( int rows = 0; rows < height; rows++ )
387 {
388 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
389 {
390 unsigned char val = *src++;
391 unsigned char reversed = 0;
392
393 for ( int bits = 0; bits < 8; bits++)
394 {
395 reversed <<= 1;
396 reversed |= (val & 0x01);
397 val >>= 1;
398 }
399 *dst++ = reversed;
400 }
401
402 if ( padding )
403 *dst++ = 0;
404 }
405 }
406 else
407 {
408 // bits should already be in Windows standard format
409 data = (char *)bits; // const_cast is harmless
410 }
411
412 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
413 if ( !hbmp )
414 {
415 wxLogLastError(wxT("CreateBitmap"));
416 }
417
418 if ( data != bits )
419 {
420 free(data);
421 }
422
423 SetHBITMAP((WXHBITMAP)hbmp);
424 #endif
425 }
426
427 // Create from XPM data
428 bool wxBitmap::CreateFromXpm(const char **data)
429 {
430 #if wxUSE_IMAGE && wxUSE_XPM
431 Init();
432
433 wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
434
435 wxXPMDecoder decoder;
436 wxImage img = decoder.ReadData(data);
437 wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
438
439 *this = wxBitmap(img);
440 return TRUE;
441 #else
442 return FALSE;
443 #endif
444 }
445
446 wxBitmap::wxBitmap(int w, int h, int d)
447 {
448 Init();
449
450 (void)Create(w, h, d);
451 }
452
453 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
454 {
455 Init();
456
457 (void)Create(w, h, dc);
458 }
459
460 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
461 {
462 Init();
463
464 (void)Create(data, type, width, height, depth);
465 }
466
467 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
468 {
469 Init();
470
471 LoadFile(filename, (int)type);
472 }
473
474 bool wxBitmap::Create(int width, int height, int depth)
475 {
476 return DoCreate(width, height, depth, 0);
477 }
478
479 bool wxBitmap::Create(int width, int height, const wxDC& dc)
480 {
481 wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
482
483 return DoCreate(width, height, -1, dc.GetHDC());
484 }
485
486 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
487 {
488 UnRef();
489
490 m_refData = new wxBitmapRefData;
491
492 GetBitmapData()->m_width = w;
493 GetBitmapData()->m_height = h;
494
495 HBITMAP hbmp;
496
497 if ( wxShouldCreateDIB(w, h, d, hdc) )
498 {
499 if ( d == -1 )
500 {
501 // create DIBs without alpha channel by default
502 d = 24;
503 }
504
505 wxDIB dib(w, h, d);
506 if ( !dib.IsOk() )
507 return FALSE;
508
509 // don't delete the DIB section in dib object dtor
510 hbmp = dib.Detach();
511
512 GetBitmapData()->m_isDIB = TRUE;
513 GetBitmapData()->m_depth = d;
514 }
515 else // create a DDB
516 {
517 if ( d == -1 )
518 d = wxDisplayDepth();
519
520 GetBitmapData()->m_depth = d;
521
522 #ifndef __WXMICROWIN__
523 if ( d > 0 )
524 {
525 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
526 if ( !hbmp )
527 {
528 wxLogLastError(wxT("CreateBitmap"));
529 }
530 }
531 else
532 #endif // !__WXMICROWIN__
533 {
534 ScreenHDC dc;
535 hbmp = ::CreateCompatibleBitmap(dc, w, h);
536 if ( !hbmp )
537 {
538 wxLogLastError(wxT("CreateCompatibleBitmap"));
539 }
540
541 GetBitmapData()->m_depth = wxDisplayDepth();
542 }
543 }
544
545 SetHBITMAP((WXHBITMAP)hbmp);
546
547 #if WXWIN_COMPATIBILITY_2
548 GetBitmapData()->m_ok = hbmp != 0;
549 #endif // WXWIN_COMPATIBILITY_2
550
551 return Ok();
552 }
553
554 #if wxUSE_IMAGE
555
556 // ----------------------------------------------------------------------------
557 // wxImage to/from conversions for Microwin
558 // ----------------------------------------------------------------------------
559
560 // Microwin versions are so different from normal ones that it really doesn't
561 // make sense to use #ifdefs inside the function bodies
562 #ifdef __WXMICROWIN__
563
564 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
565 {
566 // Set this to 1 to experiment with mask code,
567 // which currently doesn't work
568 #define USE_MASKS 0
569
570 m_refData = new wxBitmapRefData();
571
572 // Initial attempt at a simple-minded implementation.
573 // The bitmap will always be created at the screen depth,
574 // so the 'depth' argument is ignored.
575
576 HDC hScreenDC = ::GetDC(NULL);
577 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
578
579 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
580 HBITMAP hMaskBitmap = NULL;
581 HBITMAP hOldMaskBitmap = NULL;
582 HDC hMaskDC = NULL;
583 unsigned char maskR = 0;
584 unsigned char maskG = 0;
585 unsigned char maskB = 0;
586
587 // printf("Created bitmap %d\n", (int) hBitmap);
588 if (hBitmap == NULL)
589 {
590 ::ReleaseDC(NULL, hScreenDC);
591 return FALSE;
592 }
593 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
594
595 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
596 ::ReleaseDC(NULL, hScreenDC);
597
598 // created an mono-bitmap for the possible mask
599 bool hasMask = image.HasMask();
600
601 if ( hasMask )
602 {
603 #if USE_MASKS
604 // FIXME: we should be able to pass bpp = 1, but
605 // GdBlit can't handle a different depth
606 #if 0
607 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
608 #else
609 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
610 #endif
611 maskR = image.GetMaskRed();
612 maskG = image.GetMaskGreen();
613 maskB = image.GetMaskBlue();
614
615 if (!hMaskBitmap)
616 {
617 hasMask = FALSE;
618 }
619 else
620 {
621 hScreenDC = ::GetDC(NULL);
622 hMaskDC = ::CreateCompatibleDC(hScreenDC);
623 ::ReleaseDC(NULL, hScreenDC);
624
625 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
626 }
627 #else
628 hasMask = FALSE;
629 #endif
630 }
631
632 int i, j;
633 for (i = 0; i < image.GetWidth(); i++)
634 {
635 for (j = 0; j < image.GetHeight(); j++)
636 {
637 unsigned char red = image.GetRed(i, j);
638 unsigned char green = image.GetGreen(i, j);
639 unsigned char blue = image.GetBlue(i, j);
640
641 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
642
643 if (hasMask)
644 {
645 // scan the bitmap for the transparent colour and set the corresponding
646 // pixels in the mask to BLACK and the rest to WHITE
647 if (maskR == red && maskG == green && maskB == blue)
648 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
649 else
650 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
651 }
652 }
653 }
654
655 ::SelectObject(hMemDC, hOldBitmap);
656 ::DeleteDC(hMemDC);
657 if (hasMask)
658 {
659 ::SelectObject(hMaskDC, hOldMaskBitmap);
660 ::DeleteDC(hMaskDC);
661
662 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
663 }
664
665 SetWidth(image.GetWidth());
666 SetHeight(image.GetHeight());
667 SetDepth(screenDepth);
668 SetHBITMAP( (WXHBITMAP) hBitmap );
669
670 #if wxUSE_PALETTE
671 // Copy the palette from the source image
672 SetPalette(image.GetPalette());
673 #endif // wxUSE_PALETTE
674
675 #if WXWIN_COMPATIBILITY_2
676 // check the wxBitmap object
677 GetBitmapData()->SetOk();
678 #endif // WXWIN_COMPATIBILITY_2
679
680 return TRUE;
681 }
682
683 wxImage wxBitmap::ConvertToImage() const
684 {
685 // Initial attempt at a simple-minded implementation.
686 // The bitmap will always be created at the screen depth,
687 // so the 'depth' argument is ignored.
688 // TODO: transparency (create a mask image)
689
690 if (!Ok())
691 {
692 wxFAIL_MSG( wxT("bitmap is invalid") );
693 return wxNullImage;
694 }
695
696 wxImage image;
697
698 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
699
700 // create an wxImage object
701 int width = GetWidth();
702 int height = GetHeight();
703 image.Create( width, height );
704 unsigned char *data = image.GetData();
705 if( !data )
706 {
707 wxFAIL_MSG( wxT("could not allocate data for image") );
708 return wxNullImage;
709 }
710
711 HDC hScreenDC = ::GetDC(NULL);
712
713 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
714 ::ReleaseDC(NULL, hScreenDC);
715
716 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
717
718 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
719
720 int i, j;
721 for (i = 0; i < GetWidth(); i++)
722 {
723 for (j = 0; j < GetHeight(); j++)
724 {
725 COLORREF color = ::GetPixel(hMemDC, i, j);
726 unsigned char red = GetRValue(color);
727 unsigned char green = GetGValue(color);
728 unsigned char blue = GetBValue(color);
729
730 image.SetRGB(i, j, red, green, blue);
731 }
732 }
733
734 ::SelectObject(hMemDC, hOldBitmap);
735 ::DeleteDC(hMemDC);
736
737 #if wxUSE_PALETTE
738 // Copy the palette from the source image
739 if (GetPalette())
740 image.SetPalette(* GetPalette());
741 #endif // wxUSE_PALETTE
742
743 return image;
744 }
745
746 #endif // __WXMICROWIN__
747
748 // ----------------------------------------------------------------------------
749 // wxImage to/from conversions
750 // ----------------------------------------------------------------------------
751
752 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
753 {
754 return CreateFromImage(image, depth, 0);
755 }
756
757 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
758 {
759 wxCHECK_MSG( dc.Ok(), FALSE,
760 _T("invalid HDC in wxBitmap::CreateFromImage()") );
761
762 return CreateFromImage(image, -1, dc.GetHDC());
763 }
764
765 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
766 {
767 wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
768
769 UnRef();
770
771 // first convert the image to DIB
772 const int h = image.GetHeight();
773 const int w = image.GetWidth();
774
775 wxDIB dib(image);
776 if ( !dib.IsOk() )
777 return FALSE;
778
779
780 // store the bitmap parameters
781 wxBitmapRefData *refData = new wxBitmapRefData;
782 refData->m_width = w;
783 refData->m_height = h;
784 refData->m_hasAlpha = image.HasAlpha();
785
786 m_refData = refData;
787
788
789 // next either store DIB as is or create a DDB from it
790 HBITMAP hbitmap;
791
792 // are we going to use DIB?
793 //
794 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
795 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
796 {
797 // don't delete the DIB section in dib object dtor
798 hbitmap = dib.Detach();
799
800 refData->m_isDIB = TRUE;
801 refData->m_depth = dib.GetDepth();
802 }
803 else // we need to convert DIB to DDB
804 {
805 hbitmap = dib.CreateDDB((HDC)hdc);
806
807 refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
808 }
809
810 // validate this object
811 SetHBITMAP((WXHBITMAP)hbitmap);
812
813 #if WXWIN_COMPATIBILITY_2
814 m_refData->m_ok = TRUE;
815 #endif // WXWIN_COMPATIBILITY_2
816
817 // finally also set the mask if we have one
818 if ( image.HasMask() )
819 {
820 SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
821 image.GetMaskGreen(),
822 image.GetMaskBlue())));
823 }
824
825 return TRUE;
826 }
827
828 wxImage wxBitmap::ConvertToImage() const
829 {
830 wxImage image;
831
832 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
833
834 // create an wxImage object
835 int width = GetWidth();
836 int height = GetHeight();
837 image.Create( width, height );
838 unsigned char *data = image.GetData();
839 if( !data )
840 {
841 wxFAIL_MSG( wxT("could not allocate data for image") );
842 return wxNullImage;
843 }
844
845 // calc the number of bytes per scanline and padding in the DIB
846 int bytePerLine = width*3;
847 int sizeDWORD = sizeof( DWORD );
848 int lineBoundary = bytePerLine % sizeDWORD;
849 int padding = 0;
850 if( lineBoundary > 0 )
851 {
852 padding = sizeDWORD - lineBoundary;
853 bytePerLine += padding;
854 }
855
856 // create a DIB header
857 int headersize = sizeof(BITMAPINFOHEADER);
858 BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
859 if( !lpDIBh )
860 {
861 wxFAIL_MSG( wxT("could not allocate data for DIB header") );
862 free( data );
863 return wxNullImage;
864 }
865 // Fill in the DIB header
866 lpDIBh->bmiHeader.biSize = headersize;
867 lpDIBh->bmiHeader.biWidth = width;
868 lpDIBh->bmiHeader.biHeight = -height;
869 lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
870 lpDIBh->bmiHeader.biPlanes = 1;
871 lpDIBh->bmiHeader.biBitCount = 24;
872 lpDIBh->bmiHeader.biCompression = BI_RGB;
873 lpDIBh->bmiHeader.biClrUsed = 0;
874 // These seem not really needed for our purpose here.
875 lpDIBh->bmiHeader.biClrImportant = 0;
876 lpDIBh->bmiHeader.biXPelsPerMeter = 0;
877 lpDIBh->bmiHeader.biYPelsPerMeter = 0;
878 // memory for DIB data
879 unsigned char *lpBits;
880 lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
881 if( !lpBits )
882 {
883 wxFAIL_MSG( wxT("could not allocate data for DIB") );
884 free( data );
885 free( lpDIBh );
886 return wxNullImage;
887 }
888
889 // copy data from the device-dependent bitmap to the DIB
890 HDC hdc = ::GetDC(NULL);
891 HBITMAP hbitmap;
892 hbitmap = (HBITMAP) GetHBITMAP();
893 ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
894
895 // copy DIB data into the wxImage object
896 int i, j;
897 unsigned char *ptdata = data;
898 unsigned char *ptbits = lpBits;
899 for( i=0; i<height; i++ )
900 {
901 for( j=0; j<width; j++ )
902 {
903 *(ptdata++) = *(ptbits+2);
904 *(ptdata++) = *(ptbits+1);
905 *(ptdata++) = *(ptbits );
906 ptbits += 3;
907 }
908 ptbits += padding;
909 }
910
911 // similarly, set data according to the possible mask bitmap
912 if( GetMask() && GetMask()->GetMaskBitmap() )
913 {
914 hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
915 // memory DC created, color set, data copied, and memory DC deleted
916 HDC memdc = ::CreateCompatibleDC( hdc );
917 ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
918 ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
919 ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
920 ::DeleteDC( memdc );
921 // background color set to RGB(16,16,16) in consistent with wxGTK
922 unsigned char r=16, g=16, b=16;
923 ptdata = data;
924 ptbits = lpBits;
925 for( i=0; i<height; i++ )
926 {
927 for( j=0; j<width; j++ )
928 {
929 if( *ptbits != 0 )
930 ptdata += 3;
931 else
932 {
933 *(ptdata++) = r;
934 *(ptdata++) = g;
935 *(ptdata++) = b;
936 }
937 ptbits += 3;
938 }
939 ptbits += padding;
940 }
941 image.SetMaskColour( r, g, b );
942 image.SetMask( TRUE );
943 }
944 else
945 {
946 image.SetMask( FALSE );
947 }
948 // free allocated resources
949 ::ReleaseDC(NULL, hdc);
950 free(lpDIBh);
951 free(lpBits);
952
953 return image;
954 }
955
956 #endif // wxUSE_IMAGE
957
958 // ----------------------------------------------------------------------------
959 // loading and saving bitmaps
960 // ----------------------------------------------------------------------------
961
962 bool wxBitmap::LoadFile(const wxString& filename, long type)
963 {
964 UnRef();
965
966 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
967
968 if ( handler )
969 {
970 m_refData = new wxBitmapRefData;
971
972 return handler->LoadFile(this, filename, type, -1, -1);
973 }
974 #if wxUSE_IMAGE
975 else
976 {
977 wxImage image;
978 if ( image.LoadFile( filename, type ) && image.Ok() )
979 {
980 *this = wxBitmap(image);
981
982 return TRUE;
983 }
984 }
985 #endif // wxUSE_IMAGE
986
987 return FALSE;
988 }
989
990 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
991 {
992 UnRef();
993
994 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
995
996 if ( !handler )
997 {
998 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
999
1000 return FALSE;
1001 }
1002
1003 m_refData = new wxBitmapRefData;
1004
1005 return handler->Create(this, data, type, width, height, depth);
1006 }
1007
1008 bool wxBitmap::SaveFile(const wxString& filename,
1009 int type,
1010 const wxPalette *palette)
1011 {
1012 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1013
1014 if ( handler )
1015 {
1016 return handler->SaveFile(this, filename, type, palette);
1017 }
1018 #if wxUSE_IMAGE
1019 else
1020 {
1021 // FIXME what about palette? shouldn't we use it?
1022 wxImage image = ConvertToImage();
1023 if ( image.Ok() )
1024 {
1025 return image.SaveFile(filename, type);
1026 }
1027 }
1028 #endif // wxUSE_IMAGE
1029
1030 return FALSE;
1031 }
1032
1033 // ----------------------------------------------------------------------------
1034 // sub bitmap extraction
1035 // ----------------------------------------------------------------------------
1036
1037 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1038 {
1039 wxCHECK_MSG( Ok() &&
1040 (rect.x >= 0) && (rect.y >= 0) &&
1041 (rect.x+rect.width <= GetWidth()) &&
1042 (rect.y+rect.height <= GetHeight()),
1043 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1044
1045 wxBitmap ret( rect.width, rect.height );
1046 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1047
1048 #ifndef __WXMICROWIN__
1049 // TODO: copy alpha channel data if any
1050
1051 // copy bitmap data
1052 MemoryHDC dcSrc,
1053 dcDst;
1054
1055 {
1056 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1057 selectDst(dcDst, GetHbitmapOf(ret));
1058
1059 if ( !selectSrc || !selectDst )
1060 {
1061 wxLogLastError(_T("SelectObjct(hBitmap)"));
1062 }
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
1071 // copy mask if there is one
1072 if ( GetMask() )
1073 {
1074 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1075
1076 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1077 selectDst(dcDst, hbmpMask);
1078
1079 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1080 dcSrc, rect.x, rect.y, SRCCOPY) )
1081 {
1082 wxLogLastError(_T("BitBlt"));
1083 }
1084
1085 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1086 ret.SetMask(mask);
1087 }
1088 #endif // !__WXMICROWIN__
1089
1090 return ret;
1091 }
1092
1093 // ----------------------------------------------------------------------------
1094 // wxBitmap accessors
1095 // ----------------------------------------------------------------------------
1096
1097 #if wxUSE_PALETTE
1098 wxPalette* wxBitmap::GetPalette() const
1099 {
1100 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1101 : (wxPalette *) NULL;
1102 }
1103 #endif
1104
1105 wxMask *wxBitmap::GetMask() const
1106 {
1107 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1108 }
1109
1110 #ifdef __WXDEBUG__
1111
1112 wxDC *wxBitmap::GetSelectedInto() const
1113 {
1114 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1115 }
1116
1117 #endif
1118
1119 #if WXWIN_COMPATIBILITY_2_4
1120
1121 int wxBitmap::GetQuality() const
1122 {
1123 return 0;
1124 }
1125
1126 #endif // WXWIN_COMPATIBILITY_2_4
1127
1128 void wxBitmap::UseAlpha()
1129 {
1130 if ( GetBitmapData() )
1131 GetBitmapData()->m_hasAlpha = true;
1132 }
1133
1134 bool wxBitmap::HasAlpha() const
1135 {
1136 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1137 }
1138
1139 // ----------------------------------------------------------------------------
1140 // wxBitmap setters
1141 // ----------------------------------------------------------------------------
1142
1143 #ifdef __WXDEBUG__
1144
1145 void wxBitmap::SetSelectedInto(wxDC *dc)
1146 {
1147 if ( GetBitmapData() )
1148 GetBitmapData()->m_selectedInto = dc;
1149 }
1150
1151 #endif
1152
1153 #if wxUSE_PALETTE
1154
1155 void wxBitmap::SetPalette(const wxPalette& palette)
1156 {
1157 EnsureHasData();
1158
1159 GetBitmapData()->m_bitmapPalette = palette;
1160 }
1161
1162 #endif // wxUSE_PALETTE
1163
1164 void wxBitmap::SetMask(wxMask *mask)
1165 {
1166 EnsureHasData();
1167
1168 GetBitmapData()->SetMask(mask);
1169 }
1170
1171 #if WXWIN_COMPATIBILITY_2
1172
1173 void wxBitmap::SetOk(bool isOk)
1174 {
1175 EnsureHasData();
1176
1177 GetBitmapData()->m_ok = isOk;
1178 }
1179
1180 #endif // WXWIN_COMPATIBILITY_2
1181
1182 #if WXWIN_COMPATIBILITY_2_4
1183
1184 void wxBitmap::SetQuality(int WXUNUSED(quality))
1185 {
1186 }
1187
1188 #endif // WXWIN_COMPATIBILITY_2_4
1189
1190 // ----------------------------------------------------------------------------
1191 // raw bitmap access support
1192 // ----------------------------------------------------------------------------
1193
1194 #ifdef wxHAVE_RAW_BITMAP
1195 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1196 {
1197 if ( !Ok() )
1198 {
1199 // no bitmap, no data (raw or otherwise)
1200 return NULL;
1201 }
1202
1203 // if we're already a DIB we can access our data directly, but if not we
1204 // need to convert this DDB to a DIB section and use it for raw access and
1205 // then convert it back
1206 HBITMAP hDIB;
1207 if ( !GetBitmapData()->m_isDIB )
1208 {
1209 wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
1210 _T("GetRawData() may be called only once") );
1211
1212 wxDIB *dib = new wxDIB(*this);
1213 if ( !dib->IsOk() )
1214 {
1215 delete dib;
1216
1217 return NULL;
1218 }
1219
1220 // we'll free it in UngetRawData()
1221 GetBitmapData()->m_dib = dib;
1222
1223 hDIB = dib->GetHandle();
1224 }
1225 else // we're a DIB
1226 {
1227 hDIB = GetHbitmap();
1228 }
1229
1230 DIBSECTION ds;
1231 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1232 {
1233 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1234
1235 return NULL;
1236 }
1237
1238 // check that the bitmap is in correct format
1239 if ( ds.dsBm.bmBitsPixel != bpp )
1240 {
1241 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1242
1243 return NULL;
1244 }
1245
1246 // ok, store the relevant info in wxPixelDataBase
1247 const LONG h = ds.dsBm.bmHeight;
1248
1249 data.m_width = ds.dsBm.bmWidth;
1250 data.m_height = h;
1251
1252 // remember that DIBs are stored in top to bottom order!
1253 const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
1254 data.m_stride = -bytesPerRow;
1255
1256 char *bits = (char *)ds.dsBm.bmBits;
1257 if ( h > 1 )
1258 {
1259 bits += (h - 1)*bytesPerRow;
1260 }
1261
1262 return bits;
1263 }
1264
1265 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1266 {
1267 if ( !Ok() )
1268 return;
1269
1270 // the cast is ugly but we can't do without it and without making this
1271 // function template (and hence inline) unfortunately
1272 typedef wxPixelData<wxBitmap, wxAlphaPixelFormat> PixelData;
1273 PixelData& data = (PixelData &)dataBase;
1274
1275 if ( !data )
1276 {
1277 // invalid data, don't crash -- but don't assert neither as we're
1278 // called automatically from wxPixelDataBase dtor and so there is no
1279 // way to prevent this from happening
1280 return;
1281 }
1282
1283 if ( GetBitmapData()->m_hasAlpha )
1284 {
1285 // AlphaBlend() wants to have premultiplied source alpha but
1286 // wxRawBitmap API uses normal, not premultiplied, colours, so adjust
1287 // them here now
1288 PixelData::Iterator p(data);
1289
1290 const int w = data.GetWidth();
1291 const int h = data.GetHeight();
1292
1293 for ( int y = 0; y < h; y++ )
1294 {
1295 PixelData::Iterator rowStart = p;
1296
1297 for ( int x = 0; x < w; x++ )
1298 {
1299 const unsigned alpha = p.Alpha();
1300
1301 p.Red() = (p.Red() * alpha + 127) / 255;
1302 p.Blue() = (p.Blue() * alpha + 127) / 255;
1303 p.Green() = (p.Green() * alpha + 127) / 255;
1304
1305 ++p;
1306 }
1307
1308 p = rowStart;
1309 p.OffsetY(data, 1);
1310 }
1311
1312 // if we're a DDB we need to convert DIB back to DDB now to make the
1313 // changes made via raw bitmap access effective
1314 if ( !GetBitmapData()->m_isDIB )
1315 {
1316 wxDIB *dib = GetBitmapData()->m_dib;
1317 GetBitmapData()->m_dib = NULL;
1318
1319 // TODO: convert
1320
1321 delete dib;
1322 }
1323 }
1324 }
1325 #endif // #ifdef wxHAVE_RAW_BITMAP
1326
1327 // ----------------------------------------------------------------------------
1328 // wxMask
1329 // ----------------------------------------------------------------------------
1330
1331 wxMask::wxMask()
1332 {
1333 m_maskBitmap = 0;
1334 }
1335
1336 // Construct a mask from a bitmap and a colour indicating
1337 // the transparent area
1338 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1339 {
1340 m_maskBitmap = 0;
1341 Create(bitmap, colour);
1342 }
1343
1344 // Construct a mask from a bitmap and a palette index indicating
1345 // the transparent area
1346 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1347 {
1348 m_maskBitmap = 0;
1349 Create(bitmap, paletteIndex);
1350 }
1351
1352 // Construct a mask from a mono bitmap (copies the bitmap).
1353 wxMask::wxMask(const wxBitmap& bitmap)
1354 {
1355 m_maskBitmap = 0;
1356 Create(bitmap);
1357 }
1358
1359 wxMask::~wxMask()
1360 {
1361 if ( m_maskBitmap )
1362 ::DeleteObject((HBITMAP) m_maskBitmap);
1363 }
1364
1365 // Create a mask from a mono bitmap (copies the bitmap).
1366 bool wxMask::Create(const wxBitmap& bitmap)
1367 {
1368 #ifndef __WXMICROWIN__
1369 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
1370 _T("can't create mask from invalid or not monochrome bitmap") );
1371
1372 if ( m_maskBitmap )
1373 {
1374 ::DeleteObject((HBITMAP) m_maskBitmap);
1375 m_maskBitmap = 0;
1376 }
1377
1378 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1379 bitmap.GetWidth(),
1380 bitmap.GetHeight(),
1381 1, 1, 0
1382 );
1383 HDC srcDC = CreateCompatibleDC(0);
1384 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1385 HDC destDC = CreateCompatibleDC(0);
1386 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1387 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1388 SelectObject(srcDC, 0);
1389 DeleteDC(srcDC);
1390 SelectObject(destDC, 0);
1391 DeleteDC(destDC);
1392 return TRUE;
1393 #else
1394 return FALSE;
1395 #endif
1396 }
1397
1398 // Create a mask from a bitmap and a palette index indicating
1399 // the transparent area
1400 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1401 {
1402 if ( m_maskBitmap )
1403 {
1404 ::DeleteObject((HBITMAP) m_maskBitmap);
1405 m_maskBitmap = 0;
1406 }
1407
1408 #if wxUSE_PALETTE
1409 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1410 {
1411 unsigned char red, green, blue;
1412 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1413 {
1414 wxColour transparentColour(red, green, blue);
1415 return Create(bitmap, transparentColour);
1416 }
1417 }
1418 #endif // wxUSE_PALETTE
1419
1420 return FALSE;
1421 }
1422
1423 // Create a mask from a bitmap and a colour indicating
1424 // the transparent area
1425 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1426 {
1427 #ifndef __WXMICROWIN__
1428 wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
1429
1430 if ( m_maskBitmap )
1431 {
1432 ::DeleteObject((HBITMAP) m_maskBitmap);
1433 m_maskBitmap = 0;
1434 }
1435
1436 int width = bitmap.GetWidth(),
1437 height = bitmap.GetHeight();
1438
1439 // scan the bitmap for the transparent colour and set the corresponding
1440 // pixels in the mask to BLACK and the rest to WHITE
1441 COLORREF maskColour = wxColourToPalRGB(colour);
1442 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1443
1444 HDC srcDC = ::CreateCompatibleDC(NULL);
1445 HDC destDC = ::CreateCompatibleDC(NULL);
1446 if ( !srcDC || !destDC )
1447 {
1448 wxLogLastError(wxT("CreateCompatibleDC"));
1449 }
1450
1451 bool ok = TRUE;
1452
1453 // SelectObject() will fail
1454 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1455 _T("bitmap can't be selected in another DC") );
1456
1457 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1458 if ( !hbmpSrcOld )
1459 {
1460 wxLogLastError(wxT("SelectObject"));
1461
1462 ok = FALSE;
1463 }
1464
1465 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1466 if ( !hbmpDstOld )
1467 {
1468 wxLogLastError(wxT("SelectObject"));
1469
1470 ok = FALSE;
1471 }
1472
1473 if ( ok )
1474 {
1475 // this will create a monochrome bitmap with 0 points for the pixels
1476 // which have the same value as the background colour and 1 for the
1477 // others
1478 ::SetBkColor(srcDC, maskColour);
1479 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1480 }
1481
1482 ::SelectObject(srcDC, hbmpSrcOld);
1483 ::DeleteDC(srcDC);
1484 ::SelectObject(destDC, hbmpDstOld);
1485 ::DeleteDC(destDC);
1486
1487 return ok;
1488 #else // __WXMICROWIN__
1489 return FALSE;
1490 #endif // __WXMICROWIN__/!__WXMICROWIN__
1491 }
1492
1493 // ----------------------------------------------------------------------------
1494 // wxBitmapHandler
1495 // ----------------------------------------------------------------------------
1496
1497 bool wxBitmapHandler::Create(wxGDIImage *image,
1498 void *data,
1499 long flags,
1500 int width, int height, int depth)
1501 {
1502 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1503
1504 return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
1505 }
1506
1507 bool wxBitmapHandler::Load(wxGDIImage *image,
1508 const wxString& name,
1509 long flags,
1510 int width, int height)
1511 {
1512 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1513
1514 return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
1515 }
1516
1517 bool wxBitmapHandler::Save(wxGDIImage *image,
1518 const wxString& name,
1519 int type)
1520 {
1521 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1522
1523 return bitmap ? SaveFile(bitmap, name, type) : FALSE;
1524 }
1525
1526 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1527 void *WXUNUSED(data),
1528 long WXUNUSED(type),
1529 int WXUNUSED(width),
1530 int WXUNUSED(height),
1531 int WXUNUSED(depth))
1532 {
1533 return FALSE;
1534 }
1535
1536 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1537 const wxString& WXUNUSED(name),
1538 long WXUNUSED(type),
1539 int WXUNUSED(desiredWidth),
1540 int WXUNUSED(desiredHeight))
1541 {
1542 return FALSE;
1543 }
1544
1545 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1546 const wxString& WXUNUSED(name),
1547 int WXUNUSED(type),
1548 const wxPalette *WXUNUSED(palette))
1549 {
1550 return FALSE;
1551 }
1552
1553 // ----------------------------------------------------------------------------
1554 // DIB functions
1555 // ----------------------------------------------------------------------------
1556
1557 #ifndef __WXMICROWIN__
1558 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1559 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1560 {
1561 unsigned long i, headerSize;
1562 LPBITMAPINFO lpDIBheader = NULL;
1563 LPPALETTEENTRY lpPe = NULL;
1564
1565
1566 // Allocate space for a DIB header
1567 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1568 lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1569 lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1570
1571 GetPaletteEntries(hPal, 0, 256, lpPe);
1572
1573 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1574
1575 // Fill in the static parts of the DIB header
1576 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1577 lpDIBheader->bmiHeader.biWidth = xSize;
1578 lpDIBheader->bmiHeader.biHeight = ySize;
1579 lpDIBheader->bmiHeader.biPlanes = 1;
1580
1581 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1582 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1583 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1584 lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
1585 lpDIBheader->bmiHeader.biClrUsed = 256;
1586
1587
1588 // Initialize the DIB palette
1589 for (i = 0; i < 256; i++) {
1590 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1591 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1592 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1593 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1594 }
1595
1596 *lpDIBHeader = lpDIBheader;
1597
1598 return TRUE;
1599 }
1600
1601 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1602 {
1603 free(lpDIBHeader);
1604 }
1605 #endif
1606
1607 // ----------------------------------------------------------------------------
1608 // global helper functions implemented here
1609 // ----------------------------------------------------------------------------
1610
1611 // helper of wxBitmapToHICON/HCURSOR
1612 static
1613 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1614 bool iconWanted,
1615 int hotSpotX,
1616 int hotSpotY)
1617 {
1618 if ( !bmp.Ok() )
1619 {
1620 // we can't create an icon/cursor form nothing
1621 return 0;
1622 }
1623
1624 wxMask *mask = bmp.GetMask();
1625 if ( !mask )
1626 {
1627 // we must have a mask for an icon, so even if it's probably incorrect,
1628 // do create it (grey is the "standard" transparent colour)
1629 mask = new wxMask(bmp, *wxLIGHT_GREY);
1630 }
1631
1632 ICONINFO iconInfo;
1633 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1634 if ( !iconWanted )
1635 {
1636 iconInfo.xHotspot = hotSpotX;
1637 iconInfo.yHotspot = hotSpotY;
1638 }
1639
1640 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1641 iconInfo.hbmColor = GetHbitmapOf(bmp);
1642
1643 // black out the transparent area to preserve background colour, because
1644 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1645 // the mask to the dest rect.
1646 {
1647 MemoryHDC dcSrc, dcDst;
1648 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1649 selectBitmap(dcDst, iconInfo.hbmColor);
1650
1651 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1652 dcSrc, 0, 0, SRCAND) )
1653 {
1654 wxLogLastError(_T("BitBlt"));
1655 }
1656 }
1657
1658 HICON hicon = ::CreateIconIndirect(&iconInfo);
1659
1660 if ( !bmp.GetMask() )
1661 {
1662 // we created the mask, now delete it
1663 delete mask;
1664 }
1665
1666 // delete the inverted mask bitmap we created as well
1667 ::DeleteObject(iconInfo.hbmMask);
1668
1669 return hicon;
1670 }
1671
1672 HICON wxBitmapToHICON(const wxBitmap& bmp)
1673 {
1674 return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
1675 }
1676
1677 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1678 {
1679 return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
1680 }
1681
1682 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1683 {
1684 #ifndef __WXMICROWIN__
1685 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1686
1687 // get width/height from the bitmap if not given
1688 if ( !w || !h )
1689 {
1690 BITMAP bm;
1691 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1692 w = bm.bmWidth;
1693 h = bm.bmHeight;
1694 }
1695
1696 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1697 HDC hdcDst = ::CreateCompatibleDC(NULL);
1698 if ( !hdcSrc || !hdcDst )
1699 {
1700 wxLogLastError(wxT("CreateCompatibleDC"));
1701 }
1702
1703 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1704 if ( !hbmpInvMask )
1705 {
1706 wxLogLastError(wxT("CreateBitmap"));
1707 }
1708
1709 ::SelectObject(hdcSrc, hbmpMask);
1710 ::SelectObject(hdcDst, hbmpInvMask);
1711 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1712 hdcSrc, 0, 0,
1713 NOTSRCCOPY) )
1714 {
1715 wxLogLastError(wxT("BitBlt"));
1716 }
1717
1718 ::DeleteDC(hdcSrc);
1719 ::DeleteDC(hdcDst);
1720
1721 return hbmpInvMask;
1722 #else
1723 return 0;
1724 #endif
1725 }
wxWidgets (Impactor)