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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 #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 #if wxUSE_WXDIB
314 // If the icon is 32 bits per pixel then it may have alpha channel data,
315 // although there are some icons that are 32 bpp but have no alpha... So
316 // convert to a DIB and manually check the 4th byte for each pixel.
317 BITMAP bm;
318 if ( ::GetObject(iconInfo.hbmColor, sizeof(BITMAP), (LPVOID)&bm)
319 && bm.bmBitsPixel == 32)
320 {
321 wxDIB dib(iconInfo.hbmColor);
322 if (dib.IsOk())
323 {
324 unsigned char* pixels = dib.GetData();
325 for (int idx=0; idx<w*h*4; idx+=4)
326 {
327 if (pixels[idx+3] != 0)
328 {
329 // If there is an alpha byte that is non-zero then set the
330 // alpha flag and bail out of the loop.
331 refData->m_hasAlpha = true;
332 break;
333 }
334 }
335 }
336 }
337 #endif
338 if ( !refData->m_hasAlpha )
339 {
340 // the mask returned by GetIconInfo() is inverted compared to the usual
341 // wxWin convention
342 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
343 }
344
345 // delete the old one now as we don't need it any more
346 ::DeleteObject(iconInfo.hbmMask);
347
348 return true;
349 #else
350 wxUnusedVar(icon);
351 return false;
352 #endif
353 }
354
355 #endif // Win32
356
357 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
358 {
359 UnRef();
360
361 if ( !cursor.Ok() )
362 return false;
363
364 return CopyFromIconOrCursor(cursor);
365 }
366
367 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
368 {
369 UnRef();
370
371 if ( !icon.Ok() )
372 return false;
373
374 return CopyFromIconOrCursor(icon);
375 }
376
377 #ifndef NEVER_USE_DIB
378
379 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
380 {
381 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
382
383 #ifdef SOMETIMES_USE_DIB
384 HBITMAP hbitmap = dib.CreateDDB();
385 if ( !hbitmap )
386 return false;
387 #else // ALWAYS_USE_DIB
388 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
389 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
390
391 UnRef();
392
393 wxBitmapRefData *refData = new wxBitmapRefData;
394 m_refData = refData;
395
396 refData->m_width = dib.GetWidth();
397 refData->m_height = dib.GetHeight();
398 refData->m_depth = dib.GetDepth();
399
400 refData->m_hBitmap = (WXHBITMAP)hbitmap;
401
402 #if wxUSE_PALETTE
403 wxPalette *palette = dib.CreatePalette();
404 if ( palette )
405 {
406 refData->m_bitmapPalette = *palette;
407 }
408
409 delete palette;
410 #endif // wxUSE_PALETTE
411
412 return true;
413 }
414
415 #endif // NEVER_USE_DIB
416
417 wxBitmap::~wxBitmap()
418 {
419 }
420
421 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
422 {
423 Init();
424
425 #ifndef __WXMICROWIN__
426 wxBitmapRefData *refData = new wxBitmapRefData;
427 m_refData = refData;
428
429 refData->m_width = width;
430 refData->m_height = height;
431 refData->m_depth = depth;
432
433 char *data;
434 if ( depth == 1 )
435 {
436 // we assume that it is in XBM format which is not quite the same as
437 // the format CreateBitmap() wants because the order of bytes in the
438 // line is reversed!
439 const size_t bytesPerLine = (width + 7) / 8;
440 const size_t padding = bytesPerLine % 2;
441 const size_t len = height * ( padding + bytesPerLine );
442 data = (char *)malloc(len);
443 const char *src = bits;
444 char *dst = data;
445
446 for ( int rows = 0; rows < height; rows++ )
447 {
448 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
449 {
450 unsigned char val = *src++;
451 unsigned char reversed = 0;
452
453 for ( int bits = 0; bits < 8; bits++)
454 {
455 reversed <<= 1;
456 reversed |= (unsigned char)(val & 0x01);
457 val >>= 1;
458 }
459 *dst++ = reversed;
460 }
461
462 if ( padding )
463 *dst++ = 0;
464 }
465 }
466 else
467 {
468 // bits should already be in Windows standard format
469 data = (char *)bits; // const_cast is harmless
470 }
471
472 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
473 if ( !hbmp )
474 {
475 wxLogLastError(wxT("CreateBitmap"));
476 }
477
478 if ( data != bits )
479 {
480 free(data);
481 }
482
483 SetHBITMAP((WXHBITMAP)hbmp);
484 #endif
485 }
486
487 // Create from XPM data
488 bool wxBitmap::CreateFromXpm(const char **data)
489 {
490 #if wxUSE_IMAGE && wxUSE_XPM
491 Init();
492
493 wxCHECK_MSG( data != NULL, false, wxT("invalid bitmap data") )
494
495 wxXPMDecoder decoder;
496 wxImage img = decoder.ReadData(data);
497 wxCHECK_MSG( img.Ok(), false, wxT("invalid bitmap data") )
498
499 *this = wxBitmap(img);
500 return true;
501 #else
502 wxUnusedVar(data);
503 return false;
504 #endif
505 }
506
507 wxBitmap::wxBitmap(int w, int h, int d)
508 {
509 Init();
510
511 (void)Create(w, h, d);
512 }
513
514 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
515 {
516 Init();
517
518 (void)Create(w, h, dc);
519 }
520
521 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
522 {
523 Init();
524
525 (void)Create(data, type, width, height, depth);
526 }
527
528 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
529 {
530 Init();
531
532 LoadFile(filename, (int)type);
533 }
534
535 bool wxBitmap::Create(int width, int height, int depth)
536 {
537 return DoCreate(width, height, depth, 0);
538 }
539
540 bool wxBitmap::Create(int width, int height, const wxDC& dc)
541 {
542 wxCHECK_MSG( dc.Ok(), false, _T("invalid HDC in wxBitmap::Create()") );
543
544 return DoCreate(width, height, -1, dc.GetHDC());
545 }
546
547 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
548 {
549 UnRef();
550
551 m_refData = new wxBitmapRefData;
552
553 GetBitmapData()->m_width = w;
554 GetBitmapData()->m_height = h;
555
556 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
557
558 #ifndef NEVER_USE_DIB
559 if ( wxShouldCreateDIB(w, h, d, hdc) )
560 {
561 if ( d == -1 )
562 {
563 // create DIBs without alpha channel by default
564 d = 24;
565 }
566
567 wxDIB dib(w, h, d);
568 if ( !dib.IsOk() )
569 return false;
570
571 // don't delete the DIB section in dib object dtor
572 hbmp = dib.Detach();
573
574 GetBitmapData()->m_isDIB = true;
575 GetBitmapData()->m_depth = d;
576 }
577 else // create a DDB
578 #endif // NEVER_USE_DIB
579 {
580 #ifndef ALWAYS_USE_DIB
581 #ifndef __WXMICROWIN__
582 if ( d > 0 )
583 {
584 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
585 if ( !hbmp )
586 {
587 wxLogLastError(wxT("CreateBitmap"));
588 }
589
590 GetBitmapData()->m_depth = d;
591 }
592 else // d == 0, create bitmap compatible with the screen
593 #endif // !__WXMICROWIN__
594 {
595 ScreenHDC dc;
596 hbmp = ::CreateCompatibleBitmap(dc, w, h);
597 if ( !hbmp )
598 {
599 wxLogLastError(wxT("CreateCompatibleBitmap"));
600 }
601
602 GetBitmapData()->m_depth = wxDisplayDepth();
603 }
604 #endif // !ALWAYS_USE_DIB
605 }
606
607 SetHBITMAP((WXHBITMAP)hbmp);
608
609 return Ok();
610 }
611
612 #if wxUSE_IMAGE
613
614 // ----------------------------------------------------------------------------
615 // wxImage to/from conversions for Microwin
616 // ----------------------------------------------------------------------------
617
618 // Microwin versions are so different from normal ones that it really doesn't
619 // make sense to use #ifdefs inside the function bodies
620 #ifdef __WXMICROWIN__
621
622 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
623 {
624 // Set this to 1 to experiment with mask code,
625 // which currently doesn't work
626 #define USE_MASKS 0
627
628 m_refData = new wxBitmapRefData();
629
630 // Initial attempt at a simple-minded implementation.
631 // The bitmap will always be created at the screen depth,
632 // so the 'depth' argument is ignored.
633
634 HDC hScreenDC = ::GetDC(NULL);
635 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
636
637 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
638 HBITMAP hMaskBitmap = NULL;
639 HBITMAP hOldMaskBitmap = NULL;
640 HDC hMaskDC = NULL;
641 unsigned char maskR = 0;
642 unsigned char maskG = 0;
643 unsigned char maskB = 0;
644
645 // printf("Created bitmap %d\n", (int) hBitmap);
646 if (hBitmap == NULL)
647 {
648 ::ReleaseDC(NULL, hScreenDC);
649 return false;
650 }
651 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
652
653 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
654 ::ReleaseDC(NULL, hScreenDC);
655
656 // created an mono-bitmap for the possible mask
657 bool hasMask = image.HasMask();
658
659 if ( hasMask )
660 {
661 #if USE_MASKS
662 // FIXME: we should be able to pass bpp = 1, but
663 // GdBlit can't handle a different depth
664 #if 0
665 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
666 #else
667 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
668 #endif
669 maskR = image.GetMaskRed();
670 maskG = image.GetMaskGreen();
671 maskB = image.GetMaskBlue();
672
673 if (!hMaskBitmap)
674 {
675 hasMask = false;
676 }
677 else
678 {
679 hScreenDC = ::GetDC(NULL);
680 hMaskDC = ::CreateCompatibleDC(hScreenDC);
681 ::ReleaseDC(NULL, hScreenDC);
682
683 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
684 }
685 #else
686 hasMask = false;
687 #endif
688 }
689
690 int i, j;
691 for (i = 0; i < image.GetWidth(); i++)
692 {
693 for (j = 0; j < image.GetHeight(); j++)
694 {
695 unsigned char red = image.GetRed(i, j);
696 unsigned char green = image.GetGreen(i, j);
697 unsigned char blue = image.GetBlue(i, j);
698
699 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
700
701 if (hasMask)
702 {
703 // scan the bitmap for the transparent colour and set the corresponding
704 // pixels in the mask to BLACK and the rest to WHITE
705 if (maskR == red && maskG == green && maskB == blue)
706 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
707 else
708 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
709 }
710 }
711 }
712
713 ::SelectObject(hMemDC, hOldBitmap);
714 ::DeleteDC(hMemDC);
715 if (hasMask)
716 {
717 ::SelectObject(hMaskDC, hOldMaskBitmap);
718 ::DeleteDC(hMaskDC);
719
720 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
721 }
722
723 SetWidth(image.GetWidth());
724 SetHeight(image.GetHeight());
725 SetDepth(screenDepth);
726 SetHBITMAP( (WXHBITMAP) hBitmap );
727
728 #if wxUSE_PALETTE
729 // Copy the palette from the source image
730 SetPalette(image.GetPalette());
731 #endif // wxUSE_PALETTE
732
733 return true;
734 }
735
736 wxImage wxBitmap::ConvertToImage() const
737 {
738 // Initial attempt at a simple-minded implementation.
739 // The bitmap will always be created at the screen depth,
740 // so the 'depth' argument is ignored.
741 // TODO: transparency (create a mask image)
742
743 if (!Ok())
744 {
745 wxFAIL_MSG( wxT("bitmap is invalid") );
746 return wxNullImage;
747 }
748
749 wxImage image;
750
751 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
752
753 // create an wxImage object
754 int width = GetWidth();
755 int height = GetHeight();
756 image.Create( width, height );
757 unsigned char *data = image.GetData();
758 if( !data )
759 {
760 wxFAIL_MSG( wxT("could not allocate data for image") );
761 return wxNullImage;
762 }
763
764 HDC hScreenDC = ::GetDC(NULL);
765
766 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
767 ::ReleaseDC(NULL, hScreenDC);
768
769 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
770
771 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
772
773 int i, j;
774 for (i = 0; i < GetWidth(); i++)
775 {
776 for (j = 0; j < GetHeight(); j++)
777 {
778 COLORREF color = ::GetPixel(hMemDC, i, j);
779 unsigned char red = GetRValue(color);
780 unsigned char green = GetGValue(color);
781 unsigned char blue = GetBValue(color);
782
783 image.SetRGB(i, j, red, green, blue);
784 }
785 }
786
787 ::SelectObject(hMemDC, hOldBitmap);
788 ::DeleteDC(hMemDC);
789
790 #if wxUSE_PALETTE
791 // Copy the palette from the source image
792 if (GetPalette())
793 image.SetPalette(* GetPalette());
794 #endif // wxUSE_PALETTE
795
796 return image;
797 }
798
799 #endif // __WXMICROWIN__
800
801 // ----------------------------------------------------------------------------
802 // wxImage to/from conversions
803 // ----------------------------------------------------------------------------
804
805 #if wxUSE_WXDIB
806
807 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
808 {
809 return CreateFromImage(image, depth, 0);
810 }
811
812 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
813 {
814 wxCHECK_MSG( dc.Ok(), false,
815 _T("invalid HDC in wxBitmap::CreateFromImage()") );
816
817 return CreateFromImage(image, -1, dc.GetHDC());
818 }
819
820 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
821 {
822 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
823
824 UnRef();
825
826 // first convert the image to DIB
827 const int h = image.GetHeight();
828 const int w = image.GetWidth();
829
830 wxDIB dib(image);
831 if ( !dib.IsOk() )
832 return false;
833
834
835 // store the bitmap parameters
836 wxBitmapRefData *refData = new wxBitmapRefData;
837 refData->m_width = w;
838 refData->m_height = h;
839 refData->m_hasAlpha = image.HasAlpha();
840
841 m_refData = refData;
842
843
844 // next either store DIB as is or create a DDB from it
845 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
846
847 // are we going to use DIB?
848 //
849 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
850 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
851 {
852 // don't delete the DIB section in dib object dtor
853 hbitmap = dib.Detach();
854
855 refData->m_isDIB = true;
856 refData->m_depth = dib.GetDepth();
857 }
858 #ifndef ALWAYS_USE_DIB
859 else // we need to convert DIB to DDB
860 {
861 hbitmap = dib.CreateDDB((HDC)hdc);
862
863 refData->m_depth = depth == -1 ? dib.GetDepth() : depth;
864 }
865 #endif // !ALWAYS_USE_DIB
866
867 // validate this object
868 SetHBITMAP((WXHBITMAP)hbitmap);
869
870 // finally also set the mask if we have one
871 if ( image.HasMask() )
872 {
873 const size_t len = 2*((w+15)/16);
874 BYTE *src = image.GetData();
875 BYTE *data = new BYTE[h*len];
876 memset(data, 0, h*len);
877 BYTE r = image.GetMaskRed(),
878 g = image.GetMaskGreen(),
879 b = image.GetMaskBlue();
880 BYTE *dst = data;
881 for ( int y = 0; y < h; y++, dst += len )
882 {
883 BYTE *dstLine = dst;
884 BYTE mask = 0x80;
885 for ( int x = 0; x < w; x++, src += 3 )
886 {
887 if (src[0] != r || src[1] != g || src[2] != b)
888 *dstLine |= mask;
889
890 if ( (mask >>= 1) == 0 )
891 {
892 dstLine++;
893 mask = 0x80;
894 }
895 }
896 }
897
898 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
899 if ( !hbitmap )
900 {
901 wxLogLastError(_T("CreateBitmap(mask)"));
902 }
903 else
904 {
905 SetMask(new wxMask((WXHBITMAP)hbitmap));
906 }
907
908 delete[] data;
909 }
910
911 return true;
912 }
913
914 wxImage wxBitmap::ConvertToImage() const
915 {
916 // convert DDB to DIB
917 wxDIB dib(*this);
918
919 if ( !dib.IsOk() )
920 {
921 return wxNullImage;
922 }
923
924 // and then DIB to our wxImage
925 wxImage image = dib.ConvertToImage();
926 if ( !image.Ok() )
927 {
928 return wxNullImage;
929 }
930
931 // now do the same for the mask, if we have any
932 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
933 if ( hbmpMask )
934 {
935 wxDIB dibMask(hbmpMask);
936 if ( dibMask.IsOk() )
937 {
938 // TODO: use wxRawBitmap to iterate over DIB
939
940 // we hard code the mask colour for now but we could also make an
941 // effort (and waste time) to choose a colour not present in the
942 // image already to avoid having to fudge the pixels below --
943 // whether it's worth to do it is unclear however
944 static const int MASK_RED = 1;
945 static const int MASK_GREEN = 2;
946 static const int MASK_BLUE = 3;
947 static const int MASK_BLUE_REPLACEMENT = 2;
948
949 const int h = dibMask.GetHeight();
950 const int w = dibMask.GetWidth();
951 const int bpp = dibMask.GetDepth();
952 const int maskBytesPerPixel = bpp >> 3;
953 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
954 unsigned char *data = image.GetData();
955
956 // remember that DIBs are stored in bottom to top order
957 unsigned char *
958 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
959
960 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
961 {
962 // traverse one mask DIB line
963 unsigned char *mask = maskLineStart;
964 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
965 {
966 // should this pixel be transparent?
967 if ( *mask )
968 {
969 // no, check that it isn't transparent by accident
970 if ( (data[0] == MASK_RED) &&
971 (data[1] == MASK_GREEN) &&
972 (data[2] == MASK_BLUE) )
973 {
974 // we have to fudge the colour a bit to prevent
975 // this pixel from appearing transparent
976 data[2] = MASK_BLUE_REPLACEMENT;
977 }
978
979 data += 3;
980 }
981 else // yes, transparent pixel
982 {
983 *data++ = MASK_RED;
984 *data++ = MASK_GREEN;
985 *data++ = MASK_BLUE;
986 }
987 }
988 }
989
990 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
991 }
992 }
993
994 return image;
995 }
996
997 #endif // wxUSE_WXDIB
998
999 #endif // wxUSE_IMAGE
1000
1001 // ----------------------------------------------------------------------------
1002 // loading and saving bitmaps
1003 // ----------------------------------------------------------------------------
1004
1005 bool wxBitmap::LoadFile(const wxString& filename, long type)
1006 {
1007 UnRef();
1008
1009 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1010
1011 if ( handler )
1012 {
1013 m_refData = new wxBitmapRefData;
1014
1015 return handler->LoadFile(this, filename, type, -1, -1);
1016 }
1017 #if wxUSE_IMAGE
1018 else // no bitmap handler found
1019 {
1020 wxImage image;
1021 if ( image.LoadFile( filename, type ) && image.Ok() )
1022 {
1023 *this = wxBitmap(image);
1024
1025 return true;
1026 }
1027 }
1028 #endif // wxUSE_IMAGE
1029
1030 return false;
1031 }
1032
1033 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
1034 {
1035 UnRef();
1036
1037 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1038
1039 if ( !handler )
1040 {
1041 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1042
1043 return false;
1044 }
1045
1046 m_refData = new wxBitmapRefData;
1047
1048 return handler->Create(this, data, type, width, height, depth);
1049 }
1050
1051 bool wxBitmap::SaveFile(const wxString& filename,
1052 int type,
1053 const wxPalette *palette)
1054 {
1055 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1056
1057 if ( handler )
1058 {
1059 return handler->SaveFile(this, filename, type, palette);
1060 }
1061 #if wxUSE_IMAGE
1062 else // no bitmap handler found
1063 {
1064 // FIXME what about palette? shouldn't we use it?
1065 wxImage image = ConvertToImage();
1066 if ( image.Ok() )
1067 {
1068 return image.SaveFile(filename, type);
1069 }
1070 }
1071 #endif // wxUSE_IMAGE
1072
1073 return false;
1074 }
1075
1076 // ----------------------------------------------------------------------------
1077 // sub bitmap extraction
1078 // ----------------------------------------------------------------------------
1079
1080 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1081 {
1082 wxCHECK_MSG( Ok() &&
1083 (rect.x >= 0) && (rect.y >= 0) &&
1084 (rect.x+rect.width <= GetWidth()) &&
1085 (rect.y+rect.height <= GetHeight()),
1086 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1087
1088 wxBitmap ret( rect.width, rect.height, GetDepth() );
1089 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1090
1091 #ifndef __WXMICROWIN__
1092 // handle alpha channel, if any
1093 if (HasAlpha())
1094 ret.UseAlpha();
1095
1096 // copy bitmap data
1097 MemoryHDC dcSrc,
1098 dcDst;
1099
1100 {
1101 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1102 selectDst(dcDst, GetHbitmapOf(ret));
1103
1104 if ( !selectSrc || !selectDst )
1105 {
1106 wxLogLastError(_T("SelectObjct(hBitmap)"));
1107 }
1108
1109 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1110 dcSrc, rect.x, rect.y, SRCCOPY) )
1111 {
1112 wxLogLastError(_T("BitBlt"));
1113 }
1114 }
1115
1116 // copy mask if there is one
1117 if ( GetMask() )
1118 {
1119 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1120
1121 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1122 selectDst(dcDst, hbmpMask);
1123
1124 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1125 dcSrc, rect.x, rect.y, SRCCOPY) )
1126 {
1127 wxLogLastError(_T("BitBlt"));
1128 }
1129
1130 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1131 ret.SetMask(mask);
1132 }
1133 #endif // !__WXMICROWIN__
1134
1135 return ret;
1136 }
1137
1138 // ----------------------------------------------------------------------------
1139 // wxBitmap accessors
1140 // ----------------------------------------------------------------------------
1141
1142 #if wxUSE_PALETTE
1143 wxPalette* wxBitmap::GetPalette() const
1144 {
1145 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1146 : (wxPalette *) NULL;
1147 }
1148 #endif
1149
1150 wxMask *wxBitmap::GetMask() const
1151 {
1152 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1153 }
1154
1155 wxBitmap wxBitmap::GetMaskBitmap() const
1156 {
1157 wxBitmap bmp;
1158 wxMask *mask = GetMask();
1159 if ( mask )
1160 bmp.SetHBITMAP(mask->GetMaskBitmap());
1161 return bmp;
1162 }
1163
1164 #ifdef __WXDEBUG__
1165
1166 wxDC *wxBitmap::GetSelectedInto() const
1167 {
1168 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1169 }
1170
1171 #endif
1172
1173 #if WXWIN_COMPATIBILITY_2_4
1174
1175 int wxBitmap::GetQuality() const
1176 {
1177 return 0;
1178 }
1179
1180 #endif // WXWIN_COMPATIBILITY_2_4
1181
1182 void wxBitmap::UseAlpha()
1183 {
1184 if ( GetBitmapData() )
1185 GetBitmapData()->m_hasAlpha = true;
1186 }
1187
1188 bool wxBitmap::HasAlpha() const
1189 {
1190 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1191 }
1192
1193 // ----------------------------------------------------------------------------
1194 // wxBitmap setters
1195 // ----------------------------------------------------------------------------
1196
1197 #ifdef __WXDEBUG__
1198
1199 void wxBitmap::SetSelectedInto(wxDC *dc)
1200 {
1201 if ( GetBitmapData() )
1202 GetBitmapData()->m_selectedInto = dc;
1203 }
1204
1205 #endif
1206
1207 #if wxUSE_PALETTE
1208
1209 void wxBitmap::SetPalette(const wxPalette& palette)
1210 {
1211 AllocExclusive();
1212
1213 GetBitmapData()->m_bitmapPalette = palette;
1214 }
1215
1216 #endif // wxUSE_PALETTE
1217
1218 void wxBitmap::SetMask(wxMask *mask)
1219 {
1220 AllocExclusive();
1221
1222 GetBitmapData()->SetMask(mask);
1223 }
1224
1225 #if WXWIN_COMPATIBILITY_2_4
1226
1227 void wxBitmap::SetQuality(int WXUNUSED(quality))
1228 {
1229 }
1230
1231 #endif // WXWIN_COMPATIBILITY_2_4
1232
1233 // ----------------------------------------------------------------------------
1234 // raw bitmap access support
1235 // ----------------------------------------------------------------------------
1236
1237 #ifdef wxHAVE_RAW_BITMAP
1238 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1239 {
1240 #if wxUSE_WXDIB
1241 if ( !Ok() )
1242 {
1243 // no bitmap, no data (raw or otherwise)
1244 return NULL;
1245 }
1246
1247 // if we're already a DIB we can access our data directly, but if not we
1248 // need to convert this DDB to a DIB section and use it for raw access and
1249 // then convert it back
1250 HBITMAP hDIB;
1251 if ( !GetBitmapData()->m_isDIB )
1252 {
1253 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1254 _T("GetRawData() may be called only once") );
1255
1256 wxDIB *dib = new wxDIB(*this);
1257 if ( !dib->IsOk() )
1258 {
1259 delete dib;
1260
1261 return NULL;
1262 }
1263
1264 // we'll free it in UngetRawData()
1265 GetBitmapData()->m_dib = dib;
1266
1267 hDIB = dib->GetHandle();
1268 }
1269 else // we're a DIB
1270 {
1271 hDIB = GetHbitmap();
1272 }
1273
1274 DIBSECTION ds;
1275 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1276 {
1277 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1278
1279 return NULL;
1280 }
1281
1282 // check that the bitmap is in correct format
1283 if ( ds.dsBm.bmBitsPixel != bpp )
1284 {
1285 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1286
1287 return NULL;
1288 }
1289
1290 // ok, store the relevant info in wxPixelDataBase
1291 const LONG h = ds.dsBm.bmHeight;
1292
1293 data.m_width = ds.dsBm.bmWidth;
1294 data.m_height = h;
1295
1296 // remember that DIBs are stored in top to bottom order!
1297 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1298 // multiple of 2, as required by the documentation. So we use the official
1299 // formula, which we already use elsewhere.)
1300 const LONG bytesPerRow =
1301 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1302 data.m_stride = -bytesPerRow;
1303
1304 char *bits = (char *)ds.dsBm.bmBits;
1305 if ( h > 1 )
1306 {
1307 bits += (h - 1)*bytesPerRow;
1308 }
1309
1310 return bits;
1311 #else
1312 return NULL;
1313 #endif
1314 }
1315
1316 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1317 {
1318 #if wxUSE_WXDIB
1319 if ( !Ok() )
1320 return;
1321
1322 if ( !&dataBase )
1323 {
1324 // invalid data, don't crash -- but don't assert neither as we're
1325 // called automatically from wxPixelDataBase dtor and so there is no
1326 // way to prevent this from happening
1327 return;
1328 }
1329
1330 // if we're a DDB we need to convert DIB back to DDB now to make the
1331 // changes made via raw bitmap access effective
1332 if ( !GetBitmapData()->m_isDIB )
1333 {
1334 wxDIB *dib = GetBitmapData()->m_dib;
1335 GetBitmapData()->m_dib = NULL;
1336
1337 // TODO: convert
1338
1339 delete dib;
1340 }
1341 #endif // wxUSE_WXDIB
1342 }
1343 #endif // #ifdef wxHAVE_RAW_BITMAP
1344
1345 // ----------------------------------------------------------------------------
1346 // wxMask
1347 // ----------------------------------------------------------------------------
1348
1349 wxMask::wxMask()
1350 {
1351 m_maskBitmap = 0;
1352 }
1353
1354 // Construct a mask from a bitmap and a colour indicating
1355 // the transparent area
1356 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1357 {
1358 m_maskBitmap = 0;
1359 Create(bitmap, colour);
1360 }
1361
1362 // Construct a mask from a bitmap and a palette index indicating
1363 // the transparent area
1364 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1365 {
1366 m_maskBitmap = 0;
1367 Create(bitmap, paletteIndex);
1368 }
1369
1370 // Construct a mask from a mono bitmap (copies the bitmap).
1371 wxMask::wxMask(const wxBitmap& bitmap)
1372 {
1373 m_maskBitmap = 0;
1374 Create(bitmap);
1375 }
1376
1377 wxMask::~wxMask()
1378 {
1379 if ( m_maskBitmap )
1380 ::DeleteObject((HBITMAP) m_maskBitmap);
1381 }
1382
1383 // Create a mask from a mono bitmap (copies the bitmap).
1384 bool wxMask::Create(const wxBitmap& bitmap)
1385 {
1386 #ifndef __WXMICROWIN__
1387 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1388 _T("can't create mask from invalid or not monochrome bitmap") );
1389
1390 if ( m_maskBitmap )
1391 {
1392 ::DeleteObject((HBITMAP) m_maskBitmap);
1393 m_maskBitmap = 0;
1394 }
1395
1396 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1397 bitmap.GetWidth(),
1398 bitmap.GetHeight(),
1399 1, 1, 0
1400 );
1401 HDC srcDC = CreateCompatibleDC(0);
1402 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1403 HDC destDC = CreateCompatibleDC(0);
1404 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1405 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1406 SelectObject(srcDC, 0);
1407 DeleteDC(srcDC);
1408 SelectObject(destDC, 0);
1409 DeleteDC(destDC);
1410 return true;
1411 #else
1412 wxUnusedVar(bitmap);
1413 return false;
1414 #endif
1415 }
1416
1417 // Create a mask from a bitmap and a palette index indicating
1418 // the transparent area
1419 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1420 {
1421 if ( m_maskBitmap )
1422 {
1423 ::DeleteObject((HBITMAP) m_maskBitmap);
1424 m_maskBitmap = 0;
1425 }
1426
1427 #if wxUSE_PALETTE
1428 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1429 {
1430 unsigned char red, green, blue;
1431 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1432 {
1433 wxColour transparentColour(red, green, blue);
1434 return Create(bitmap, transparentColour);
1435 }
1436 }
1437 #endif // wxUSE_PALETTE
1438
1439 return false;
1440 }
1441
1442 // Create a mask from a bitmap and a colour indicating
1443 // the transparent area
1444 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1445 {
1446 #ifndef __WXMICROWIN__
1447 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1448
1449 if ( m_maskBitmap )
1450 {
1451 ::DeleteObject((HBITMAP) m_maskBitmap);
1452 m_maskBitmap = 0;
1453 }
1454
1455 int width = bitmap.GetWidth(),
1456 height = bitmap.GetHeight();
1457
1458 // scan the bitmap for the transparent colour and set the corresponding
1459 // pixels in the mask to BLACK and the rest to WHITE
1460 COLORREF maskColour = wxColourToPalRGB(colour);
1461 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1462
1463 HDC srcDC = ::CreateCompatibleDC(NULL);
1464 HDC destDC = ::CreateCompatibleDC(NULL);
1465 if ( !srcDC || !destDC )
1466 {
1467 wxLogLastError(wxT("CreateCompatibleDC"));
1468 }
1469
1470 bool ok = true;
1471
1472 // SelectObject() will fail
1473 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1474 _T("bitmap can't be selected in another DC") );
1475
1476 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1477 if ( !hbmpSrcOld )
1478 {
1479 wxLogLastError(wxT("SelectObject"));
1480
1481 ok = false;
1482 }
1483
1484 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1485 if ( !hbmpDstOld )
1486 {
1487 wxLogLastError(wxT("SelectObject"));
1488
1489 ok = false;
1490 }
1491
1492 if ( ok )
1493 {
1494 // this will create a monochrome bitmap with 0 points for the pixels
1495 // which have the same value as the background colour and 1 for the
1496 // others
1497 ::SetBkColor(srcDC, maskColour);
1498 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1499 }
1500
1501 ::SelectObject(srcDC, hbmpSrcOld);
1502 ::DeleteDC(srcDC);
1503 ::SelectObject(destDC, hbmpDstOld);
1504 ::DeleteDC(destDC);
1505
1506 return ok;
1507 #else // __WXMICROWIN__
1508 wxUnusedVar(bitmap);
1509 wxUnusedVar(colour);
1510 return false;
1511 #endif // __WXMICROWIN__/!__WXMICROWIN__
1512 }
1513
1514 // ----------------------------------------------------------------------------
1515 // wxBitmapHandler
1516 // ----------------------------------------------------------------------------
1517
1518 bool wxBitmapHandler::Create(wxGDIImage *image,
1519 void *data,
1520 long flags,
1521 int width, int height, int depth)
1522 {
1523 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1524
1525 return bitmap ? Create(bitmap, data, flags, width, height, depth) : false;
1526 }
1527
1528 bool wxBitmapHandler::Load(wxGDIImage *image,
1529 const wxString& name,
1530 long flags,
1531 int width, int height)
1532 {
1533 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1534
1535 return bitmap ? LoadFile(bitmap, name, flags, width, height) : false;
1536 }
1537
1538 bool wxBitmapHandler::Save(wxGDIImage *image,
1539 const wxString& name,
1540 int type)
1541 {
1542 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1543
1544 return bitmap ? SaveFile(bitmap, name, type) : false;
1545 }
1546
1547 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1548 void *WXUNUSED(data),
1549 long WXUNUSED(type),
1550 int WXUNUSED(width),
1551 int WXUNUSED(height),
1552 int WXUNUSED(depth))
1553 {
1554 return false;
1555 }
1556
1557 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1558 const wxString& WXUNUSED(name),
1559 long WXUNUSED(type),
1560 int WXUNUSED(desiredWidth),
1561 int WXUNUSED(desiredHeight))
1562 {
1563 return false;
1564 }
1565
1566 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1567 const wxString& WXUNUSED(name),
1568 int WXUNUSED(type),
1569 const wxPalette *WXUNUSED(palette))
1570 {
1571 return false;
1572 }
1573
1574 // ----------------------------------------------------------------------------
1575 // DIB functions
1576 // ----------------------------------------------------------------------------
1577
1578 #ifndef __WXMICROWIN__
1579 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1580 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1581 {
1582 unsigned long i, headerSize;
1583
1584 // Allocate space for a DIB header
1585 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1586 LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1587 LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1588
1589 GetPaletteEntries(hPal, 0, 256, lpPe);
1590
1591 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1592
1593 // Fill in the static parts of the DIB header
1594 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1595 lpDIBheader->bmiHeader.biWidth = xSize;
1596 lpDIBheader->bmiHeader.biHeight = ySize;
1597 lpDIBheader->bmiHeader.biPlanes = 1;
1598
1599 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1600 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1601 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1602 lpDIBheader->bmiHeader.biSizeImage = (xSize * abs(ySize) * bitsPerPixel) >> 3;
1603 lpDIBheader->bmiHeader.biClrUsed = 256;
1604
1605
1606 // Initialize the DIB palette
1607 for (i = 0; i < 256; i++) {
1608 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1609 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1610 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1611 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1612 }
1613
1614 *lpDIBHeader = lpDIBheader;
1615
1616 return true;
1617 }
1618
1619 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1620 {
1621 free(lpDIBHeader);
1622 }
1623 #endif
1624
1625 // ----------------------------------------------------------------------------
1626 // global helper functions implemented here
1627 // ----------------------------------------------------------------------------
1628
1629 // helper of wxBitmapToHICON/HCURSOR
1630 static
1631 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1632 bool iconWanted,
1633 int hotSpotX,
1634 int hotSpotY)
1635 {
1636 if ( !bmp.Ok() )
1637 {
1638 // we can't create an icon/cursor form nothing
1639 return 0;
1640 }
1641
1642 wxMask* mask;
1643 wxBitmap newbmp;
1644 if ( bmp.HasAlpha() )
1645 {
1646 // Convert alpha to a mask. NOTE: It would be better to actually put
1647 // the alpha into the icon instead of making a mask, but I don't have
1648 // time to figure that out today.
1649 wxImage img = bmp.ConvertToImage();
1650 img.ConvertAlphaToMask();
1651 newbmp = wxBitmap(img);
1652 mask = newbmp.GetMask();
1653 }
1654 else
1655 {
1656 mask = bmp.GetMask();
1657 }
1658
1659 if ( !mask )
1660 {
1661 // we must have a mask for an icon, so even if it's probably incorrect,
1662 // do create it (grey is the "standard" transparent colour)
1663 mask = new wxMask(bmp, *wxLIGHT_GREY);
1664 }
1665
1666 ICONINFO iconInfo;
1667 wxZeroMemory(iconInfo);
1668 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1669 if ( !iconWanted )
1670 {
1671 iconInfo.xHotspot = hotSpotX;
1672 iconInfo.yHotspot = hotSpotY;
1673 }
1674
1675 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1676 iconInfo.hbmColor = GetHbitmapOf(bmp);
1677
1678 // black out the transparent area to preserve background colour, because
1679 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1680 // the mask to the dest rect.
1681 {
1682 MemoryHDC dcSrc, dcDst;
1683 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1684 selectBitmap(dcDst, iconInfo.hbmColor);
1685
1686 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1687 dcSrc, 0, 0, SRCAND) )
1688 {
1689 wxLogLastError(_T("BitBlt"));
1690 }
1691 }
1692
1693 HICON hicon = ::CreateIconIndirect(&iconInfo);
1694
1695 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1696 {
1697 // we created the mask, now delete it
1698 delete mask;
1699 }
1700
1701 // delete the inverted mask bitmap we created as well
1702 ::DeleteObject(iconInfo.hbmMask);
1703
1704 return hicon;
1705 }
1706
1707 HICON wxBitmapToHICON(const wxBitmap& bmp)
1708 {
1709 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1710 }
1711
1712 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1713 {
1714 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1715 }
1716
1717 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1718 {
1719 #ifndef __WXMICROWIN__
1720 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1721
1722 // get width/height from the bitmap if not given
1723 if ( !w || !h )
1724 {
1725 BITMAP bm;
1726 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1727 w = bm.bmWidth;
1728 h = bm.bmHeight;
1729 }
1730
1731 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1732 HDC hdcDst = ::CreateCompatibleDC(NULL);
1733 if ( !hdcSrc || !hdcDst )
1734 {
1735 wxLogLastError(wxT("CreateCompatibleDC"));
1736 }
1737
1738 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1739 if ( !hbmpInvMask )
1740 {
1741 wxLogLastError(wxT("CreateBitmap"));
1742 }
1743
1744 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1745 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1746 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1747 hdcSrc, 0, 0,
1748 NOTSRCCOPY) )
1749 {
1750 wxLogLastError(wxT("BitBlt"));
1751 }
1752
1753 // Deselect objects
1754 SelectObject(hdcSrc,srcTmp);
1755 SelectObject(hdcDst,dstTmp);
1756
1757 ::DeleteDC(hdcSrc);
1758 ::DeleteDC(hdcDst);
1759
1760 return hbmpInvMask;
1761 #else
1762 return 0;
1763 #endif
1764 }
wxWidgets (Impactor)