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fix wxBitmap mask copying
[wxWidgets.git] / src / msw / bitmap.cpp
1 ////////////////////////////////////////////////////////////////////////////
2 // Name: src/msw/bitmap.cpp
3 // Purpose: wxBitmap
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 04/01/98
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 // For compilers that support precompilation, includes "wx.h".
21 #include "wx/wxprec.h"
22
23 #ifdef __BORLANDC__
24 #pragma hdrstop
25 #endif
26
27 #include "wx/bitmap.h"
28
29 #ifndef WX_PRECOMP
30 #include <stdio.h>
31
32 #include "wx/list.h"
33 #include "wx/utils.h"
34 #include "wx/app.h"
35 #include "wx/palette.h"
36 #include "wx/dcmemory.h"
37 #include "wx/icon.h"
38 #include "wx/log.h"
39 #include "wx/image.h"
40 #endif
41
42 #include "wx/msw/private.h"
43
44 #if wxUSE_WXDIB
45 #include "wx/msw/dib.h"
46 #endif
47
48 #ifdef wxHAVE_RAW_BITMAP
49 #include "wx/rawbmp.h"
50 #endif
51
52 // missing from mingw32 header
53 #ifndef CLR_INVALID
54 #define CLR_INVALID ((COLORREF)-1)
55 #endif // no CLR_INVALID
56
57 // ----------------------------------------------------------------------------
58 // Bitmap data
59 // ----------------------------------------------------------------------------
60
61 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
62 {
63 public:
64 wxBitmapRefData();
65 wxBitmapRefData(const wxBitmapRefData& data);
66 virtual ~wxBitmapRefData() { Free(); }
67
68 virtual void Free();
69
70 // set the mask object to use as the mask, we take ownership of it
71 void SetMask(wxMask *mask)
72 {
73 delete m_bitmapMask;
74 m_bitmapMask = mask;
75 }
76
77 // set the HBITMAP to use as the mask
78 void SetMask(HBITMAP hbmpMask)
79 {
80 SetMask(new wxMask((WXHBITMAP)hbmpMask));
81 }
82
83 // return the mask
84 wxMask *GetMask() const { return m_bitmapMask; }
85
86 public:
87 #if wxUSE_PALETTE
88 wxPalette m_bitmapPalette;
89 #endif // wxUSE_PALETTE
90
91 // MSW-specific
92 // ------------
93
94 #ifdef __WXDEBUG__
95 // this field is solely for error checking: we detect selecting a bitmap
96 // into more than one DC at once or deleting a bitmap still selected into a
97 // DC (both are serious programming errors under Windows)
98 wxDC *m_selectedInto;
99 #endif // __WXDEBUG__
100
101 #if wxUSE_WXDIB
102 // when GetRawData() is called for a DDB we need to convert it to a DIB
103 // first to be able to provide direct access to it and we cache that DIB
104 // here and convert it back to DDB when UngetRawData() is called
105 wxDIB *m_dib;
106 #endif
107
108 // true if we have alpha transparency info and can be drawn using
109 // AlphaBlend()
110 bool m_hasAlpha;
111
112 // true if our HBITMAP is a DIB section, false if it is a DDB
113 bool m_isDIB;
114
115 private:
116 // optional mask for transparent drawing
117 wxMask *m_bitmapMask;
118
119
120 // not implemented
121 wxBitmapRefData& operator=(const 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 //
143 // NB: we always use DIBs under Windows CE as this is much simpler (even if
144 // also less efficient...) and we obviously can't use them if there is no
145 // DIB support compiled in at all
146 #ifdef __WXWINCE__
147 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
148
149 #define ALWAYS_USE_DIB
150 #elif !wxUSE_WXDIB
151 // no sense in defining wxShouldCreateDIB() as we can't compile code
152 // executed if it is true, so we have to use #if's anyhow
153 #define NEVER_USE_DIB
154 #else // wxUSE_WXDIB && !__WXWINCE__
155 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
156 {
157 // here is the logic:
158 //
159 // (a) if hdc is specified, the caller explicitly wants DDB
160 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
161 // or less DIBs anyhow)
162 // (c) finally, create DIBs under Win9x even if the depth hasn't been
163 // explicitly specified but the current display depth is 24 or
164 // more and the image is "big", i.e. > 16Mb which is the
165 // theoretical limit for DDBs under Win9x
166 //
167 // consequences (all of which seem to make sense):
168 //
169 // (i) by default, DDBs are created (depth == -1 usually)
170 // (ii) DIBs can be created by explicitly specifying the depth
171 // (iii) using a DC always forces creating a DDB
172 return !hdc &&
173 (d >= 24 ||
174 (d == -1 &&
175 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
176 }
177
178 #define SOMETIMES_USE_DIB
179 #endif // different DIB usage scenarious
180
181 // ----------------------------------------------------------------------------
182 // wxBitmapRefData
183 // ----------------------------------------------------------------------------
184
185 wxBitmapRefData::wxBitmapRefData()
186 {
187 #ifdef __WXDEBUG__
188 m_selectedInto = NULL;
189 #endif
190 m_bitmapMask = NULL;
191
192 m_hBitmap = (WXHBITMAP) NULL;
193 #if wxUSE_WXDIB
194 m_dib = NULL;
195 #endif
196
197 m_isDIB =
198 m_hasAlpha = false;
199 }
200
201 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
202 : wxGDIImageRefData(data)
203 {
204 #ifdef __WXDEBUG__
205 m_selectedInto = NULL;
206 #endif
207
208 // (deep) copy the mask if present
209 m_bitmapMask = NULL;
210 if (data.m_bitmapMask)
211 m_bitmapMask = new wxMask(*data.m_bitmapMask);
212
213 // FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
214 // CloneRefData()
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 wxGDIImageRefData *wxBitmap::CreateData() const
249 {
250 return new wxBitmapRefData;
251 }
252
253 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
254 {
255 const wxBitmapRefData *
256 data = wx_static_cast(const wxBitmapRefData *, dataOrig);
257 if ( !data )
258 return NULL;
259
260 // FIXME: this method is backwards, it should just create a new
261 // wxBitmapRefData using its copy ctor but instead it modifies this
262 // bitmap itself and then returns its m_refData -- which works, of
263 // course (except in !wxUSE_WXDIB), but is completely illogical
264 wxBitmap *self = wx_const_cast(wxBitmap *, this);
265
266 #if wxUSE_WXDIB
267 // copy the other bitmap
268 if ( data->m_hBitmap )
269 {
270 wxDIB dib((HBITMAP)(data->m_hBitmap));
271 self->CopyFromDIB(dib);
272 }
273 else
274 #endif // wxUSE_WXDIB
275 {
276 // copy the bitmap data
277 self->m_refData = new wxBitmapRefData(*data);
278 }
279
280 // copy also the mask
281 wxMask * const maskSrc = data->GetMask();
282 if ( maskSrc )
283 {
284 wxBitmapRefData *selfdata = wx_static_cast(wxBitmapRefData *, m_refData);
285
286 selfdata->SetMask(new wxMask(*maskSrc));
287 }
288
289 return m_refData;
290 }
291
292 #ifdef __WIN32__
293
294 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
295 {
296 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
297 // it may be either HICON or HCURSOR
298 HICON hicon = (HICON)icon.GetHandle();
299
300 ICONINFO iconInfo;
301 if ( !::GetIconInfo(hicon, &iconInfo) )
302 {
303 wxLogLastError(wxT("GetIconInfo"));
304
305 return false;
306 }
307
308 wxBitmapRefData *refData = new wxBitmapRefData;
309 m_refData = refData;
310
311 int w = icon.GetWidth(),
312 h = icon.GetHeight();
313
314 refData->m_width = w;
315 refData->m_height = h;
316 refData->m_depth = wxDisplayDepth();
317
318 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
319
320 #if wxUSE_WXDIB
321 // If the icon is 32 bits per pixel then it may have alpha channel data,
322 // although there are some icons that are 32 bpp but have no alpha... So
323 // convert to a DIB and manually check the 4th byte for each pixel.
324 BITMAP bm;
325 if ( ::GetObject(iconInfo.hbmColor, sizeof(BITMAP), (LPVOID)&bm)
326 && bm.bmBitsPixel == 32)
327 {
328 wxDIB dib(iconInfo.hbmColor);
329 if (dib.IsOk())
330 {
331 unsigned char* pixels = dib.GetData();
332 for (int idx=0; idx<w*h*4; idx+=4)
333 {
334 if (pixels[idx+3] != 0)
335 {
336 // If there is an alpha byte that is non-zero then set the
337 // alpha flag and bail out of the loop.
338 refData->m_hasAlpha = true;
339 break;
340 }
341 }
342 }
343 }
344 #endif
345 if ( !refData->m_hasAlpha )
346 {
347 // the mask returned by GetIconInfo() is inverted compared to the usual
348 // wxWin convention
349 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
350 }
351
352 // delete the old one now as we don't need it any more
353 ::DeleteObject(iconInfo.hbmMask);
354
355 return true;
356 #else
357 wxUnusedVar(icon);
358 return false;
359 #endif
360 }
361
362 #endif // Win32
363
364 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
365 {
366 UnRef();
367
368 if ( !cursor.Ok() )
369 return false;
370
371 return CopyFromIconOrCursor(cursor);
372 }
373
374 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
375 {
376 UnRef();
377
378 if ( !icon.Ok() )
379 return false;
380
381 return CopyFromIconOrCursor(icon);
382 }
383
384 #ifndef NEVER_USE_DIB
385
386 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
387 {
388 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
389
390 #ifdef SOMETIMES_USE_DIB
391 HBITMAP hbitmap = dib.CreateDDB();
392 if ( !hbitmap )
393 return false;
394 #else // ALWAYS_USE_DIB
395 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
396 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
397
398 UnRef();
399
400 wxBitmapRefData *refData = new wxBitmapRefData;
401 m_refData = refData;
402
403 refData->m_width = dib.GetWidth();
404 refData->m_height = dib.GetHeight();
405 refData->m_depth = dib.GetDepth();
406
407 refData->m_hBitmap = (WXHBITMAP)hbitmap;
408
409 #if wxUSE_PALETTE
410 wxPalette *palette = dib.CreatePalette();
411 if ( palette )
412 {
413 refData->m_bitmapPalette = *palette;
414 }
415
416 delete palette;
417 #endif // wxUSE_PALETTE
418
419 return true;
420 }
421
422 #endif // NEVER_USE_DIB
423
424 wxBitmap::~wxBitmap()
425 {
426 }
427
428 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
429 {
430 #ifndef __WXMICROWIN__
431 wxBitmapRefData *refData = new wxBitmapRefData;
432 m_refData = refData;
433
434 refData->m_width = width;
435 refData->m_height = height;
436 refData->m_depth = depth;
437
438 char *data;
439 if ( depth == 1 )
440 {
441 // we assume that it is in XBM format which is not quite the same as
442 // the format CreateBitmap() wants because the order of bytes in the
443 // line is reversed!
444 const size_t bytesPerLine = (width + 7) / 8;
445 const size_t padding = bytesPerLine % 2;
446 const size_t len = height * ( padding + bytesPerLine );
447 data = (char *)malloc(len);
448 const char *src = bits;
449 char *dst = data;
450
451 for ( int rows = 0; rows < height; rows++ )
452 {
453 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
454 {
455 unsigned char val = *src++;
456 unsigned char reversed = 0;
457
458 for ( int bits = 0; bits < 8; bits++)
459 {
460 reversed <<= 1;
461 reversed |= (unsigned char)(val & 0x01);
462 val >>= 1;
463 }
464 *dst++ = ~reversed;
465 }
466
467 if ( padding )
468 *dst++ = 0;
469 }
470 }
471 else
472 {
473 // bits should already be in Windows standard format
474 data = (char *)bits; // const_cast is harmless
475 }
476
477 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
478 if ( !hbmp )
479 {
480 wxLogLastError(wxT("CreateBitmap"));
481 }
482
483 if ( data != bits )
484 {
485 free(data);
486 }
487
488 SetHBITMAP((WXHBITMAP)hbmp);
489 #endif
490 }
491
492 wxBitmap::wxBitmap(int w, int h, int d)
493 {
494 (void)Create(w, h, d);
495 }
496
497 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
498 {
499 (void)Create(w, h, dc);
500 }
501
502 wxBitmap::wxBitmap(const void* data, long type, int width, int height, int depth)
503 {
504 (void)Create(data, type, width, height, depth);
505 }
506
507 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
508 {
509 LoadFile(filename, (int)type);
510 }
511
512 bool wxBitmap::Create(int width, int height, int depth)
513 {
514 return DoCreate(width, height, depth, 0);
515 }
516
517 bool wxBitmap::Create(int width, int height, const wxDC& dc)
518 {
519 wxCHECK_MSG( dc.Ok(), false, _T("invalid HDC in wxBitmap::Create()") );
520
521 return DoCreate(width, height, -1, dc.GetHDC());
522 }
523
524 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
525 {
526 UnRef();
527
528 m_refData = new wxBitmapRefData;
529
530 GetBitmapData()->m_width = w;
531 GetBitmapData()->m_height = h;
532
533 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
534
535 #ifndef NEVER_USE_DIB
536 if ( wxShouldCreateDIB(w, h, d, hdc) )
537 {
538 if ( d == -1 )
539 {
540 // create DIBs without alpha channel by default
541 d = 24;
542 }
543
544 wxDIB dib(w, h, d);
545 if ( !dib.IsOk() )
546 return false;
547
548 // don't delete the DIB section in dib object dtor
549 hbmp = dib.Detach();
550
551 GetBitmapData()->m_isDIB = true;
552 GetBitmapData()->m_depth = d;
553 }
554 else // create a DDB
555 #endif // NEVER_USE_DIB
556 {
557 #ifndef ALWAYS_USE_DIB
558 #ifndef __WXMICROWIN__
559 if ( d > 0 )
560 {
561 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
562 if ( !hbmp )
563 {
564 wxLogLastError(wxT("CreateBitmap"));
565 }
566
567 GetBitmapData()->m_depth = d;
568 }
569 else // d == 0, create bitmap compatible with the screen
570 #endif // !__WXMICROWIN__
571 {
572 ScreenHDC dc;
573 hbmp = ::CreateCompatibleBitmap(dc, w, h);
574 if ( !hbmp )
575 {
576 wxLogLastError(wxT("CreateCompatibleBitmap"));
577 }
578
579 GetBitmapData()->m_depth = wxDisplayDepth();
580 }
581 #endif // !ALWAYS_USE_DIB
582 }
583
584 SetHBITMAP((WXHBITMAP)hbmp);
585
586 return Ok();
587 }
588
589 #if wxUSE_IMAGE
590
591 // ----------------------------------------------------------------------------
592 // wxImage to/from conversions for Microwin
593 // ----------------------------------------------------------------------------
594
595 // Microwin versions are so different from normal ones that it really doesn't
596 // make sense to use #ifdefs inside the function bodies
597 #ifdef __WXMICROWIN__
598
599 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
600 {
601 // Set this to 1 to experiment with mask code,
602 // which currently doesn't work
603 #define USE_MASKS 0
604
605 m_refData = new wxBitmapRefData();
606
607 // Initial attempt at a simple-minded implementation.
608 // The bitmap will always be created at the screen depth,
609 // so the 'depth' argument is ignored.
610
611 HDC hScreenDC = ::GetDC(NULL);
612 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
613
614 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
615 HBITMAP hMaskBitmap = NULL;
616 HBITMAP hOldMaskBitmap = NULL;
617 HDC hMaskDC = NULL;
618 unsigned char maskR = 0;
619 unsigned char maskG = 0;
620 unsigned char maskB = 0;
621
622 // printf("Created bitmap %d\n", (int) hBitmap);
623 if (hBitmap == NULL)
624 {
625 ::ReleaseDC(NULL, hScreenDC);
626 return false;
627 }
628 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
629
630 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
631 ::ReleaseDC(NULL, hScreenDC);
632
633 // created an mono-bitmap for the possible mask
634 bool hasMask = image.HasMask();
635
636 if ( hasMask )
637 {
638 #if USE_MASKS
639 // FIXME: we should be able to pass bpp = 1, but
640 // GdBlit can't handle a different depth
641 #if 0
642 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
643 #else
644 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
645 #endif
646 maskR = image.GetMaskRed();
647 maskG = image.GetMaskGreen();
648 maskB = image.GetMaskBlue();
649
650 if (!hMaskBitmap)
651 {
652 hasMask = false;
653 }
654 else
655 {
656 hScreenDC = ::GetDC(NULL);
657 hMaskDC = ::CreateCompatibleDC(hScreenDC);
658 ::ReleaseDC(NULL, hScreenDC);
659
660 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
661 }
662 #else
663 hasMask = false;
664 #endif
665 }
666
667 int i, j;
668 for (i = 0; i < image.GetWidth(); i++)
669 {
670 for (j = 0; j < image.GetHeight(); j++)
671 {
672 unsigned char red = image.GetRed(i, j);
673 unsigned char green = image.GetGreen(i, j);
674 unsigned char blue = image.GetBlue(i, j);
675
676 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
677
678 if (hasMask)
679 {
680 // scan the bitmap for the transparent colour and set the corresponding
681 // pixels in the mask to BLACK and the rest to WHITE
682 if (maskR == red && maskG == green && maskB == blue)
683 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
684 else
685 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
686 }
687 }
688 }
689
690 ::SelectObject(hMemDC, hOldBitmap);
691 ::DeleteDC(hMemDC);
692 if (hasMask)
693 {
694 ::SelectObject(hMaskDC, hOldMaskBitmap);
695 ::DeleteDC(hMaskDC);
696
697 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
698 }
699
700 SetWidth(image.GetWidth());
701 SetHeight(image.GetHeight());
702 SetDepth(screenDepth);
703 SetHBITMAP( (WXHBITMAP) hBitmap );
704
705 #if wxUSE_PALETTE
706 // Copy the palette from the source image
707 SetPalette(image.GetPalette());
708 #endif // wxUSE_PALETTE
709
710 return true;
711 }
712
713 wxImage wxBitmap::ConvertToImage() const
714 {
715 // Initial attempt at a simple-minded implementation.
716 // The bitmap will always be created at the screen depth,
717 // so the 'depth' argument is ignored.
718 // TODO: transparency (create a mask image)
719
720 if (!Ok())
721 {
722 wxFAIL_MSG( wxT("bitmap is invalid") );
723 return wxNullImage;
724 }
725
726 wxImage image;
727
728 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
729
730 // create an wxImage object
731 int width = GetWidth();
732 int height = GetHeight();
733 image.Create( width, height );
734 unsigned char *data = image.GetData();
735 if( !data )
736 {
737 wxFAIL_MSG( wxT("could not allocate data for image") );
738 return wxNullImage;
739 }
740
741 HDC hScreenDC = ::GetDC(NULL);
742
743 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
744 ::ReleaseDC(NULL, hScreenDC);
745
746 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
747
748 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
749
750 int i, j;
751 for (i = 0; i < GetWidth(); i++)
752 {
753 for (j = 0; j < GetHeight(); j++)
754 {
755 COLORREF color = ::GetPixel(hMemDC, i, j);
756 unsigned char red = GetRValue(color);
757 unsigned char green = GetGValue(color);
758 unsigned char blue = GetBValue(color);
759
760 image.SetRGB(i, j, red, green, blue);
761 }
762 }
763
764 ::SelectObject(hMemDC, hOldBitmap);
765 ::DeleteDC(hMemDC);
766
767 #if wxUSE_PALETTE
768 // Copy the palette from the source image
769 if (GetPalette())
770 image.SetPalette(* GetPalette());
771 #endif // wxUSE_PALETTE
772
773 return image;
774 }
775
776 #endif // __WXMICROWIN__
777
778 // ----------------------------------------------------------------------------
779 // wxImage to/from conversions
780 // ----------------------------------------------------------------------------
781
782 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
783 {
784 return CreateFromImage(image, depth, 0);
785 }
786
787 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
788 {
789 wxCHECK_MSG( dc.Ok(), false,
790 _T("invalid HDC in wxBitmap::CreateFromImage()") );
791
792 return CreateFromImage(image, -1, dc.GetHDC());
793 }
794
795 #if wxUSE_WXDIB
796
797 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
798 {
799 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
800
801 UnRef();
802
803 // first convert the image to DIB
804 const int h = image.GetHeight();
805 const int w = image.GetWidth();
806
807 wxDIB dib(image);
808 if ( !dib.IsOk() )
809 return false;
810
811 if ( depth == -1 )
812 depth = dib.GetDepth(); // Get depth from image if none specified
813
814 // store the bitmap parameters
815 wxBitmapRefData *refData = new wxBitmapRefData;
816 refData->m_width = w;
817 refData->m_height = h;
818 refData->m_hasAlpha = image.HasAlpha();
819
820 m_refData = refData;
821
822
823 // next either store DIB as is or create a DDB from it
824 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
825
826 // are we going to use DIB?
827 //
828 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
829 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
830 {
831 // don't delete the DIB section in dib object dtor
832 hbitmap = dib.Detach();
833
834 refData->m_isDIB = true;
835 refData->m_depth = depth;
836 }
837 #ifndef ALWAYS_USE_DIB
838 else // we need to convert DIB to DDB
839 {
840 hbitmap = dib.CreateDDB((HDC)hdc);
841
842 refData->m_depth = depth;
843 }
844 #endif // !ALWAYS_USE_DIB
845
846 // validate this object
847 SetHBITMAP((WXHBITMAP)hbitmap);
848
849 // finally also set the mask if we have one
850 if ( image.HasMask() )
851 {
852 const size_t len = 2*((w+15)/16);
853 BYTE *src = image.GetData();
854 BYTE *data = new BYTE[h*len];
855 memset(data, 0, h*len);
856 BYTE r = image.GetMaskRed(),
857 g = image.GetMaskGreen(),
858 b = image.GetMaskBlue();
859 BYTE *dst = data;
860 for ( int y = 0; y < h; y++, dst += len )
861 {
862 BYTE *dstLine = dst;
863 BYTE mask = 0x80;
864 for ( int x = 0; x < w; x++, src += 3 )
865 {
866 if (src[0] != r || src[1] != g || src[2] != b)
867 *dstLine |= mask;
868
869 if ( (mask >>= 1) == 0 )
870 {
871 dstLine++;
872 mask = 0x80;
873 }
874 }
875 }
876
877 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
878 if ( !hbitmap )
879 {
880 wxLogLastError(_T("CreateBitmap(mask)"));
881 }
882 else
883 {
884 SetMask(new wxMask((WXHBITMAP)hbitmap));
885 }
886
887 delete[] data;
888 }
889
890 return true;
891 }
892
893 wxImage wxBitmap::ConvertToImage() const
894 {
895 // convert DDB to DIB
896 wxDIB dib(*this);
897
898 if ( !dib.IsOk() )
899 {
900 return wxNullImage;
901 }
902
903 // and then DIB to our wxImage
904 wxImage image = dib.ConvertToImage();
905 if ( !image.Ok() )
906 {
907 return wxNullImage;
908 }
909
910 // now do the same for the mask, if we have any
911 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
912 if ( hbmpMask )
913 {
914 wxDIB dibMask(hbmpMask);
915 if ( dibMask.IsOk() )
916 {
917 // TODO: use wxRawBitmap to iterate over DIB
918
919 // we hard code the mask colour for now but we could also make an
920 // effort (and waste time) to choose a colour not present in the
921 // image already to avoid having to fudge the pixels below --
922 // whether it's worth to do it is unclear however
923 static const int MASK_RED = 1;
924 static const int MASK_GREEN = 2;
925 static const int MASK_BLUE = 3;
926 static const int MASK_BLUE_REPLACEMENT = 2;
927
928 const int h = dibMask.GetHeight();
929 const int w = dibMask.GetWidth();
930 const int bpp = dibMask.GetDepth();
931 const int maskBytesPerPixel = bpp >> 3;
932 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
933 unsigned char *data = image.GetData();
934
935 // remember that DIBs are stored in bottom to top order
936 unsigned char *
937 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
938
939 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
940 {
941 // traverse one mask DIB line
942 unsigned char *mask = maskLineStart;
943 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
944 {
945 // should this pixel be transparent?
946 if ( *mask )
947 {
948 // no, check that it isn't transparent by accident
949 if ( (data[0] == MASK_RED) &&
950 (data[1] == MASK_GREEN) &&
951 (data[2] == MASK_BLUE) )
952 {
953 // we have to fudge the colour a bit to prevent
954 // this pixel from appearing transparent
955 data[2] = MASK_BLUE_REPLACEMENT;
956 }
957
958 data += 3;
959 }
960 else // yes, transparent pixel
961 {
962 *data++ = MASK_RED;
963 *data++ = MASK_GREEN;
964 *data++ = MASK_BLUE;
965 }
966 }
967 }
968
969 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
970 }
971 }
972
973 return image;
974 }
975
976 #else // !wxUSE_WXDIB
977
978 bool
979 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
980 int WXUNUSED(depth),
981 WXHDC WXUNUSED(hdc))
982 {
983 return false;
984 }
985
986 wxImage wxBitmap::ConvertToImage() const
987 {
988 return wxImage();
989 }
990
991 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
992
993 #endif // wxUSE_IMAGE
994
995 // ----------------------------------------------------------------------------
996 // loading and saving bitmaps
997 // ----------------------------------------------------------------------------
998
999 bool wxBitmap::LoadFile(const wxString& filename, long type)
1000 {
1001 UnRef();
1002
1003 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1004
1005 if ( handler )
1006 {
1007 m_refData = new wxBitmapRefData;
1008
1009 return handler->LoadFile(this, filename, type, -1, -1);
1010 }
1011 #if wxUSE_IMAGE && wxUSE_WXDIB
1012 else // no bitmap handler found
1013 {
1014 wxImage image;
1015 if ( image.LoadFile( filename, type ) && image.Ok() )
1016 {
1017 *this = wxBitmap(image);
1018
1019 return true;
1020 }
1021 }
1022 #endif // wxUSE_IMAGE
1023
1024 return false;
1025 }
1026
1027 bool wxBitmap::Create(const void* data, long type, int width, int height, int depth)
1028 {
1029 UnRef();
1030
1031 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1032
1033 if ( !handler )
1034 {
1035 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1036
1037 return false;
1038 }
1039
1040 m_refData = new wxBitmapRefData;
1041
1042 return handler->Create(this, data, type, width, height, depth);
1043 }
1044
1045 bool wxBitmap::SaveFile(const wxString& filename,
1046 int type,
1047 const wxPalette *palette)
1048 {
1049 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1050
1051 if ( handler )
1052 {
1053 return handler->SaveFile(this, filename, type, palette);
1054 }
1055 #if wxUSE_IMAGE && wxUSE_WXDIB
1056 else // no bitmap handler found
1057 {
1058 // FIXME what about palette? shouldn't we use it?
1059 wxImage image = ConvertToImage();
1060 if ( image.Ok() )
1061 {
1062 return image.SaveFile(filename, type);
1063 }
1064 }
1065 #endif // wxUSE_IMAGE
1066
1067 return false;
1068 }
1069
1070 // ----------------------------------------------------------------------------
1071 // sub bitmap extraction
1072 // ----------------------------------------------------------------------------
1073
1074 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1075 {
1076 wxCHECK_MSG( Ok() &&
1077 (rect.x >= 0) && (rect.y >= 0) &&
1078 (rect.x+rect.width <= GetWidth()) &&
1079 (rect.y+rect.height <= GetHeight()),
1080 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1081
1082 wxBitmap ret( rect.width, rect.height, GetDepth() );
1083 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1084
1085 #ifndef __WXMICROWIN__
1086 // handle alpha channel, if any
1087 if (HasAlpha())
1088 ret.UseAlpha();
1089
1090 // copy bitmap data
1091 MemoryHDC dcSrc,
1092 dcDst;
1093
1094 {
1095 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1096 selectDst(dcDst, GetHbitmapOf(ret));
1097
1098 if ( !selectSrc || !selectDst )
1099 {
1100 wxLogLastError(_T("SelectObjct(hBitmap)"));
1101 }
1102
1103 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1104 dcSrc, rect.x, rect.y, SRCCOPY) )
1105 {
1106 wxLogLastError(_T("BitBlt"));
1107 }
1108 }
1109
1110 // copy mask if there is one
1111 if ( GetMask() )
1112 {
1113 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1114
1115 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1116 selectDst(dcDst, hbmpMask);
1117
1118 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1119 dcSrc, rect.x, rect.y, SRCCOPY) )
1120 {
1121 wxLogLastError(_T("BitBlt"));
1122 }
1123
1124 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1125 ret.SetMask(mask);
1126 }
1127 #endif // !__WXMICROWIN__
1128
1129 return ret;
1130 }
1131
1132 // ----------------------------------------------------------------------------
1133 // wxBitmap accessors
1134 // ----------------------------------------------------------------------------
1135
1136 #if wxUSE_PALETTE
1137 wxPalette* wxBitmap::GetPalette() const
1138 {
1139 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1140 : (wxPalette *) NULL;
1141 }
1142 #endif
1143
1144 wxMask *wxBitmap::GetMask() const
1145 {
1146 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1147 }
1148
1149 wxBitmap wxBitmap::GetMaskBitmap() const
1150 {
1151 wxBitmap bmp;
1152 wxMask *mask = GetMask();
1153 if ( mask )
1154 bmp.SetHBITMAP(mask->GetMaskBitmap());
1155 return bmp;
1156 }
1157
1158 #ifdef __WXDEBUG__
1159
1160 wxDC *wxBitmap::GetSelectedInto() const
1161 {
1162 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1163 }
1164
1165 #endif
1166
1167 #if WXWIN_COMPATIBILITY_2_4
1168
1169 int wxBitmap::GetQuality() const
1170 {
1171 return 0;
1172 }
1173
1174 #endif // WXWIN_COMPATIBILITY_2_4
1175
1176 void wxBitmap::UseAlpha()
1177 {
1178 if ( GetBitmapData() )
1179 GetBitmapData()->m_hasAlpha = true;
1180 }
1181
1182 bool wxBitmap::HasAlpha() const
1183 {
1184 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1185 }
1186
1187 // ----------------------------------------------------------------------------
1188 // wxBitmap setters
1189 // ----------------------------------------------------------------------------
1190
1191 #ifdef __WXDEBUG__
1192
1193 void wxBitmap::SetSelectedInto(wxDC *dc)
1194 {
1195 if ( GetBitmapData() )
1196 GetBitmapData()->m_selectedInto = dc;
1197 }
1198
1199 #endif
1200
1201 #if wxUSE_PALETTE
1202
1203 void wxBitmap::SetPalette(const wxPalette& palette)
1204 {
1205 AllocExclusive();
1206
1207 GetBitmapData()->m_bitmapPalette = palette;
1208 }
1209
1210 #endif // wxUSE_PALETTE
1211
1212 void wxBitmap::SetMask(wxMask *mask)
1213 {
1214 AllocExclusive();
1215
1216 GetBitmapData()->SetMask(mask);
1217 }
1218
1219 #if WXWIN_COMPATIBILITY_2_4
1220
1221 void wxBitmap::SetQuality(int WXUNUSED(quality))
1222 {
1223 }
1224
1225 #endif // WXWIN_COMPATIBILITY_2_4
1226
1227 // ----------------------------------------------------------------------------
1228 // raw bitmap access support
1229 // ----------------------------------------------------------------------------
1230
1231 #ifdef wxHAVE_RAW_BITMAP
1232 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1233 {
1234 #if wxUSE_WXDIB
1235 if ( !Ok() )
1236 {
1237 // no bitmap, no data (raw or otherwise)
1238 return NULL;
1239 }
1240
1241 // if we're already a DIB we can access our data directly, but if not we
1242 // need to convert this DDB to a DIB section and use it for raw access and
1243 // then convert it back
1244 HBITMAP hDIB;
1245 if ( !GetBitmapData()->m_isDIB )
1246 {
1247 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1248 _T("GetRawData() may be called only once") );
1249
1250 wxDIB *dib = new wxDIB(*this);
1251 if ( !dib->IsOk() )
1252 {
1253 delete dib;
1254
1255 return NULL;
1256 }
1257
1258 // we'll free it in UngetRawData()
1259 GetBitmapData()->m_dib = dib;
1260
1261 hDIB = dib->GetHandle();
1262 }
1263 else // we're a DIB
1264 {
1265 hDIB = GetHbitmap();
1266 }
1267
1268 DIBSECTION ds;
1269 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1270 {
1271 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1272
1273 return NULL;
1274 }
1275
1276 // check that the bitmap is in correct format
1277 if ( ds.dsBm.bmBitsPixel != bpp )
1278 {
1279 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1280
1281 return NULL;
1282 }
1283
1284 // ok, store the relevant info in wxPixelDataBase
1285 const LONG h = ds.dsBm.bmHeight;
1286
1287 data.m_width = ds.dsBm.bmWidth;
1288 data.m_height = h;
1289
1290 // remember that DIBs are stored in top to bottom order!
1291 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1292 // multiple of 2, as required by the documentation. So we use the official
1293 // formula, which we already use elsewhere.)
1294 const LONG bytesPerRow =
1295 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1296 data.m_stride = -bytesPerRow;
1297
1298 char *bits = (char *)ds.dsBm.bmBits;
1299 if ( h > 1 )
1300 {
1301 bits += (h - 1)*bytesPerRow;
1302 }
1303
1304 return bits;
1305 #else
1306 return NULL;
1307 #endif
1308 }
1309
1310 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1311 {
1312 #if wxUSE_WXDIB
1313 if ( !Ok() )
1314 return;
1315
1316 if ( !&dataBase )
1317 {
1318 // invalid data, don't crash -- but don't assert neither as we're
1319 // called automatically from wxPixelDataBase dtor and so there is no
1320 // way to prevent this from happening
1321 return;
1322 }
1323
1324 // if we're a DDB we need to convert DIB back to DDB now to make the
1325 // changes made via raw bitmap access effective
1326 if ( !GetBitmapData()->m_isDIB )
1327 {
1328 wxDIB *dib = GetBitmapData()->m_dib;
1329 GetBitmapData()->m_dib = NULL;
1330
1331 // TODO: convert
1332
1333 delete dib;
1334 }
1335 #endif // wxUSE_WXDIB
1336 }
1337 #endif // #ifdef wxHAVE_RAW_BITMAP
1338
1339 // ----------------------------------------------------------------------------
1340 // wxMask
1341 // ----------------------------------------------------------------------------
1342
1343 wxMask::wxMask()
1344 {
1345 m_maskBitmap = 0;
1346 }
1347
1348 // Copy constructor
1349 wxMask::wxMask(const wxMask &mask)
1350 {
1351 BITMAP bmp;
1352
1353 HDC srcDC = CreateCompatibleDC(0);
1354 HDC destDC = CreateCompatibleDC(0);
1355
1356 // GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
1357 // so we'll use GetObject() API here:
1358 if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
1359 {
1360 wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
1361 return;
1362 }
1363
1364 // create our HBITMAP
1365 int w = bmp.bmWidth, h = bmp.bmHeight;
1366 m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
1367
1368 // copy the mask's HBITMAP into our HBITMAP
1369 SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
1370 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1371
1372 BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
1373
1374 SelectObject(srcDC, 0);
1375 DeleteDC(srcDC);
1376 SelectObject(destDC, 0);
1377 DeleteDC(destDC);
1378 }
1379
1380 // Construct a mask from a bitmap and a colour indicating
1381 // the transparent area
1382 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1383 {
1384 m_maskBitmap = 0;
1385 Create(bitmap, colour);
1386 }
1387
1388 // Construct a mask from a bitmap and a palette index indicating
1389 // the transparent area
1390 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1391 {
1392 m_maskBitmap = 0;
1393 Create(bitmap, paletteIndex);
1394 }
1395
1396 // Construct a mask from a mono bitmap (copies the bitmap).
1397 wxMask::wxMask(const wxBitmap& bitmap)
1398 {
1399 m_maskBitmap = 0;
1400 Create(bitmap);
1401 }
1402
1403 wxMask::~wxMask()
1404 {
1405 if ( m_maskBitmap )
1406 ::DeleteObject((HBITMAP) m_maskBitmap);
1407 }
1408
1409 // Create a mask from a mono bitmap (copies the bitmap).
1410 bool wxMask::Create(const wxBitmap& bitmap)
1411 {
1412 #ifndef __WXMICROWIN__
1413 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1414 _T("can't create mask from invalid or not monochrome bitmap") );
1415
1416 if ( m_maskBitmap )
1417 {
1418 ::DeleteObject((HBITMAP) m_maskBitmap);
1419 m_maskBitmap = 0;
1420 }
1421
1422 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1423 bitmap.GetWidth(),
1424 bitmap.GetHeight(),
1425 1, 1, 0
1426 );
1427 HDC srcDC = CreateCompatibleDC(0);
1428 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1429 HDC destDC = CreateCompatibleDC(0);
1430 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1431 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1432 SelectObject(srcDC, 0);
1433 DeleteDC(srcDC);
1434 SelectObject(destDC, 0);
1435 DeleteDC(destDC);
1436 return true;
1437 #else
1438 wxUnusedVar(bitmap);
1439 return false;
1440 #endif
1441 }
1442
1443 // Create a mask from a bitmap and a palette index indicating
1444 // the transparent area
1445 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1446 {
1447 if ( m_maskBitmap )
1448 {
1449 ::DeleteObject((HBITMAP) m_maskBitmap);
1450 m_maskBitmap = 0;
1451 }
1452
1453 #if wxUSE_PALETTE
1454 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1455 {
1456 unsigned char red, green, blue;
1457 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1458 {
1459 wxColour transparentColour(red, green, blue);
1460 return Create(bitmap, transparentColour);
1461 }
1462 }
1463 #endif // wxUSE_PALETTE
1464
1465 return false;
1466 }
1467
1468 // Create a mask from a bitmap and a colour indicating
1469 // the transparent area
1470 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1471 {
1472 #ifndef __WXMICROWIN__
1473 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1474
1475 if ( m_maskBitmap )
1476 {
1477 ::DeleteObject((HBITMAP) m_maskBitmap);
1478 m_maskBitmap = 0;
1479 }
1480
1481 int width = bitmap.GetWidth(),
1482 height = bitmap.GetHeight();
1483
1484 // scan the bitmap for the transparent colour and set the corresponding
1485 // pixels in the mask to BLACK and the rest to WHITE
1486 COLORREF maskColour = wxColourToPalRGB(colour);
1487 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1488
1489 HDC srcDC = ::CreateCompatibleDC(NULL);
1490 HDC destDC = ::CreateCompatibleDC(NULL);
1491 if ( !srcDC || !destDC )
1492 {
1493 wxLogLastError(wxT("CreateCompatibleDC"));
1494 }
1495
1496 bool ok = true;
1497
1498 // SelectObject() will fail
1499 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1500 _T("bitmap can't be selected in another DC") );
1501
1502 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1503 if ( !hbmpSrcOld )
1504 {
1505 wxLogLastError(wxT("SelectObject"));
1506
1507 ok = false;
1508 }
1509
1510 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1511 if ( !hbmpDstOld )
1512 {
1513 wxLogLastError(wxT("SelectObject"));
1514
1515 ok = false;
1516 }
1517
1518 if ( ok )
1519 {
1520 // this will create a monochrome bitmap with 0 points for the pixels
1521 // which have the same value as the background colour and 1 for the
1522 // others
1523 ::SetBkColor(srcDC, maskColour);
1524 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1525 }
1526
1527 ::SelectObject(srcDC, hbmpSrcOld);
1528 ::DeleteDC(srcDC);
1529 ::SelectObject(destDC, hbmpDstOld);
1530 ::DeleteDC(destDC);
1531
1532 return ok;
1533 #else // __WXMICROWIN__
1534 wxUnusedVar(bitmap);
1535 wxUnusedVar(colour);
1536 return false;
1537 #endif // __WXMICROWIN__/!__WXMICROWIN__
1538 }
1539
1540 // ----------------------------------------------------------------------------
1541 // wxBitmapHandler
1542 // ----------------------------------------------------------------------------
1543
1544 bool wxBitmapHandler::Create(wxGDIImage *image,
1545 const void* data,
1546 long flags,
1547 int width, int height, int depth)
1548 {
1549 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1550
1551 return bitmap && Create(bitmap, data, flags, width, height, depth);
1552 }
1553
1554 bool wxBitmapHandler::Load(wxGDIImage *image,
1555 const wxString& name,
1556 long flags,
1557 int width, int height)
1558 {
1559 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1560
1561 return bitmap && LoadFile(bitmap, name, flags, width, height);
1562 }
1563
1564 bool wxBitmapHandler::Save(wxGDIImage *image,
1565 const wxString& name,
1566 int type)
1567 {
1568 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1569
1570 return bitmap && SaveFile(bitmap, name, type);
1571 }
1572
1573 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1574 const void* WXUNUSED(data),
1575 long WXUNUSED(type),
1576 int WXUNUSED(width),
1577 int WXUNUSED(height),
1578 int WXUNUSED(depth))
1579 {
1580 return false;
1581 }
1582
1583 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1584 const wxString& WXUNUSED(name),
1585 long WXUNUSED(type),
1586 int WXUNUSED(desiredWidth),
1587 int WXUNUSED(desiredHeight))
1588 {
1589 return false;
1590 }
1591
1592 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1593 const wxString& WXUNUSED(name),
1594 int WXUNUSED(type),
1595 const wxPalette *WXUNUSED(palette))
1596 {
1597 return false;
1598 }
1599
1600 // ----------------------------------------------------------------------------
1601 // DIB functions
1602 // ----------------------------------------------------------------------------
1603
1604 #ifndef __WXMICROWIN__
1605 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1606 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1607 {
1608 unsigned long i, headerSize;
1609
1610 // Allocate space for a DIB header
1611 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1612 LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1613 LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1614
1615 GetPaletteEntries(hPal, 0, 256, lpPe);
1616
1617 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1618
1619 // Fill in the static parts of the DIB header
1620 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1621 lpDIBheader->bmiHeader.biWidth = xSize;
1622 lpDIBheader->bmiHeader.biHeight = ySize;
1623 lpDIBheader->bmiHeader.biPlanes = 1;
1624
1625 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1626 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1627 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1628 lpDIBheader->bmiHeader.biSizeImage = (xSize * abs(ySize) * bitsPerPixel) >> 3;
1629 lpDIBheader->bmiHeader.biClrUsed = 256;
1630
1631
1632 // Initialize the DIB palette
1633 for (i = 0; i < 256; i++) {
1634 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1635 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1636 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1637 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1638 }
1639
1640 *lpDIBHeader = lpDIBheader;
1641
1642 return true;
1643 }
1644
1645 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1646 {
1647 free(lpDIBHeader);
1648 }
1649 #endif
1650
1651 // ----------------------------------------------------------------------------
1652 // global helper functions implemented here
1653 // ----------------------------------------------------------------------------
1654
1655 // helper of wxBitmapToHICON/HCURSOR
1656 static
1657 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1658 bool iconWanted,
1659 int hotSpotX,
1660 int hotSpotY)
1661 {
1662 if ( !bmp.Ok() )
1663 {
1664 // we can't create an icon/cursor form nothing
1665 return 0;
1666 }
1667
1668 if ( bmp.HasAlpha() )
1669 {
1670 // Create an empty mask bitmap.
1671 // it doesn't seem to work if we mess with the mask at all.
1672 HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1673
1674 ICONINFO iconInfo;
1675 wxZeroMemory(iconInfo);
1676 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1677 if ( !iconWanted )
1678 {
1679 iconInfo.xHotspot = hotSpotX;
1680 iconInfo.yHotspot = hotSpotY;
1681 }
1682
1683 iconInfo.hbmMask = hMonoBitmap;
1684 iconInfo.hbmColor = GetHbitmapOf(bmp);
1685
1686 HICON hicon = ::CreateIconIndirect(&iconInfo);
1687
1688 ::DeleteObject(hMonoBitmap);
1689
1690 return hicon;
1691 }
1692
1693 wxMask* mask = bmp.GetMask();
1694
1695 if ( !mask )
1696 {
1697 // we must have a mask for an icon, so even if it's probably incorrect,
1698 // do create it (grey is the "standard" transparent colour)
1699 mask = new wxMask(bmp, *wxLIGHT_GREY);
1700 }
1701
1702 ICONINFO iconInfo;
1703 wxZeroMemory(iconInfo);
1704 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1705 if ( !iconWanted )
1706 {
1707 iconInfo.xHotspot = hotSpotX;
1708 iconInfo.yHotspot = hotSpotY;
1709 }
1710
1711 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1712 iconInfo.hbmColor = GetHbitmapOf(bmp);
1713
1714 // black out the transparent area to preserve background colour, because
1715 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1716 // the mask to the dest rect.
1717 {
1718 MemoryHDC dcSrc, dcDst;
1719 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1720 selectBitmap(dcDst, iconInfo.hbmColor);
1721
1722 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1723 dcSrc, 0, 0, SRCAND) )
1724 {
1725 wxLogLastError(_T("BitBlt"));
1726 }
1727 }
1728
1729 HICON hicon = ::CreateIconIndirect(&iconInfo);
1730
1731 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1732 {
1733 // we created the mask, now delete it
1734 delete mask;
1735 }
1736
1737 // delete the inverted mask bitmap we created as well
1738 ::DeleteObject(iconInfo.hbmMask);
1739
1740 return hicon;
1741 }
1742
1743 HICON wxBitmapToHICON(const wxBitmap& bmp)
1744 {
1745 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1746 }
1747
1748 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1749 {
1750 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1751 }
1752
1753 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1754 {
1755 #ifndef __WXMICROWIN__
1756 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1757
1758 // get width/height from the bitmap if not given
1759 if ( !w || !h )
1760 {
1761 BITMAP bm;
1762 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1763 w = bm.bmWidth;
1764 h = bm.bmHeight;
1765 }
1766
1767 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1768 HDC hdcDst = ::CreateCompatibleDC(NULL);
1769 if ( !hdcSrc || !hdcDst )
1770 {
1771 wxLogLastError(wxT("CreateCompatibleDC"));
1772 }
1773
1774 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1775 if ( !hbmpInvMask )
1776 {
1777 wxLogLastError(wxT("CreateBitmap"));
1778 }
1779
1780 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1781 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1782 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1783 hdcSrc, 0, 0,
1784 NOTSRCCOPY) )
1785 {
1786 wxLogLastError(wxT("BitBlt"));
1787 }
1788
1789 // Deselect objects
1790 SelectObject(hdcSrc,srcTmp);
1791 SelectObject(hdcDst,dstTmp);
1792
1793 ::DeleteDC(hdcSrc);
1794 ::DeleteDC(hdcDst);
1795
1796 return hbmpInvMask;
1797 #else
1798 return 0;
1799 #endif
1800 }
wxWidgets (Impactor)