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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 // For compilers that support precompilation, includes "wx.h".
21 #include "wx/wxprec.h"
22
23 #ifdef __BORLANDC__
24 #pragma hdrstop
25 #endif
26
27 #ifndef WX_PRECOMP
28 #include <stdio.h>
29
30 #include "wx/list.h"
31 #include "wx/utils.h"
32 #include "wx/app.h"
33 #include "wx/palette.h"
34 #include "wx/dcmemory.h"
35 #include "wx/bitmap.h"
36 #include "wx/icon.h"
37 #endif
38
39 #include "wx/msw/private.h"
40 #include "wx/log.h"
41
42 #if wxUSE_WXDIB
43 #include "wx/msw/dib.h"
44 #endif
45
46 #include "wx/image.h"
47 #include "wx/xpmdecod.h"
48
49 #ifdef wxHAVE_RAW_BITMAP
50 #include "wx/rawbmp.h"
51 #endif
52
53 // missing from mingw32 header
54 #ifndef CLR_INVALID
55 #define CLR_INVALID ((COLORREF)-1)
56 #endif // no CLR_INVALID
57
58 // ----------------------------------------------------------------------------
59 // Bitmap data
60 // ----------------------------------------------------------------------------
61
62 class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
63 {
64 public:
65 wxBitmapRefData();
66 wxBitmapRefData(const wxBitmapRefData& data);
67 virtual ~wxBitmapRefData() { Free(); }
68
69 virtual void Free();
70
71 // set the mask object to use as the mask, we take ownership of it
72 void SetMask(wxMask *mask)
73 {
74 delete m_bitmapMask;
75 m_bitmapMask = mask;
76 }
77
78 // set the HBITMAP to use as the mask
79 void SetMask(HBITMAP hbmpMask)
80 {
81 SetMask(new wxMask((WXHBITMAP)hbmpMask));
82 }
83
84 // return the mask
85 wxMask *GetMask() const { return m_bitmapMask; }
86
87 public:
88 #if wxUSE_PALETTE
89 wxPalette m_bitmapPalette;
90 #endif // wxUSE_PALETTE
91
92 // MSW-specific
93 // ------------
94
95 #ifdef __WXDEBUG__
96 // this field is solely for error checking: we detect selecting a bitmap
97 // into more than one DC at once or deleting a bitmap still selected into a
98 // DC (both are serious programming errors under Windows)
99 wxDC *m_selectedInto;
100 #endif // __WXDEBUG__
101
102 #if wxUSE_WXDIB
103 // when GetRawData() is called for a DDB we need to convert it to a DIB
104 // first to be able to provide direct access to it and we cache that DIB
105 // here and convert it back to DDB when UngetRawData() is called
106 wxDIB *m_dib;
107 #endif
108
109 // true if we have alpha transparency info and can be drawn using
110 // AlphaBlend()
111 bool m_hasAlpha;
112
113 // true if our HBITMAP is a DIB section, false if it is a DDB
114 bool m_isDIB;
115
116 private:
117 // optional mask for transparent drawing
118 wxMask *m_bitmapMask;
119
120
121 // not implemented
122 wxBitmapRefData& operator=(const wxBitmapRefData&);
123 };
124
125 // ----------------------------------------------------------------------------
126 // macros
127 // ----------------------------------------------------------------------------
128
129 IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
130 IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
131
132 IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
133
134 // ============================================================================
135 // implementation
136 // ============================================================================
137
138 // ----------------------------------------------------------------------------
139 // helper functions
140 // ----------------------------------------------------------------------------
141
142 // decide whether we should create a DIB or a DDB for the given parameters
143 //
144 // NB: we always use DIBs under Windows CE as this is much simpler (even if
145 // also less efficient...) and we obviously can't use them if there is no
146 // DIB support compiled in at all
147 #ifdef __WXWINCE__
148 static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
149
150 #define ALWAYS_USE_DIB
151 #elif !wxUSE_WXDIB
152 // no sense in defining wxShouldCreateDIB() as we can't compile code
153 // executed if it is true, so we have to use #if's anyhow
154 #define NEVER_USE_DIB
155 #else // wxUSE_WXDIB && !__WXWINCE__
156 static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
157 {
158 // here is the logic:
159 //
160 // (a) if hdc is specified, the caller explicitly wants DDB
161 // (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
162 // or less DIBs anyhow)
163 // (c) finally, create DIBs under Win9x even if the depth hasn't been
164 // explicitly specified but the current display depth is 24 or
165 // more and the image is "big", i.e. > 16Mb which is the
166 // theoretical limit for DDBs under Win9x
167 //
168 // consequences (all of which seem to make sense):
169 //
170 // (i) by default, DDBs are created (depth == -1 usually)
171 // (ii) DIBs can be created by explicitly specifying the depth
172 // (iii) using a DC always forces creating a DDB
173 return !hdc &&
174 (d >= 24 ||
175 (d == -1 &&
176 wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
177 }
178
179 #define SOMETIMES_USE_DIB
180 #endif // different DIB usage scenarious
181
182 // ----------------------------------------------------------------------------
183 // wxBitmapRefData
184 // ----------------------------------------------------------------------------
185
186 wxBitmapRefData::wxBitmapRefData()
187 {
188 #ifdef __WXDEBUG__
189 m_selectedInto = NULL;
190 #endif
191 m_bitmapMask = NULL;
192
193 m_hBitmap = (WXHBITMAP) NULL;
194 #if wxUSE_WXDIB
195 m_dib = NULL;
196 #endif
197
198 m_isDIB =
199 m_hasAlpha = false;
200 }
201
202 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
203 : wxGDIImageRefData(data)
204 {
205 #ifdef __WXDEBUG__
206 m_selectedInto = NULL;
207 #endif
208
209 // can't copy the mask as the other bitmap destroys it
210 m_bitmapMask = NULL;
211
212 wxASSERT_MSG( !data.m_isDIB,
213 _T("can't copy bitmap locked for raw access!") );
214 m_isDIB = false;
215
216 m_hasAlpha = data.m_hasAlpha;
217 }
218
219 void wxBitmapRefData::Free()
220 {
221 wxASSERT_MSG( !m_selectedInto,
222 wxT("deleting bitmap still selected into wxMemoryDC") );
223
224 #if wxUSE_WXDIB
225 wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
226 #endif
227
228 if ( m_hBitmap)
229 {
230 if ( !::DeleteObject((HBITMAP)m_hBitmap) )
231 {
232 wxLogLastError(wxT("DeleteObject(hbitmap)"));
233 }
234 }
235
236 delete m_bitmapMask;
237 m_bitmapMask = NULL;
238 }
239
240 // ----------------------------------------------------------------------------
241 // wxBitmap creation
242 // ----------------------------------------------------------------------------
243
244 wxGDIImageRefData *wxBitmap::CreateData() const
245 {
246 return new wxBitmapRefData;
247 }
248
249 wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
250 {
251 const wxBitmapRefData *
252 data = wx_static_cast(const wxBitmapRefData *, dataOrig);
253 if ( !data )
254 return NULL;
255
256 wxBitmap *self = wx_const_cast(wxBitmap *, this);
257
258 #if wxUSE_WXDIB
259 // copy the other bitmap
260 if ( data->m_hBitmap )
261 {
262 wxDIB dib((HBITMAP)(data->m_hBitmap));
263 self->CopyFromDIB(dib);
264 }
265 else
266 #endif // wxUSE_WXDIB
267 {
268 // don't copy the bitmap data, but do copy the size, depth, ...
269 self->m_refData = new wxBitmapRefData(*data);
270 }
271
272 return m_refData;
273 }
274
275 #ifdef __WIN32__
276
277 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
278 {
279 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
280 // it may be either HICON or HCURSOR
281 HICON hicon = (HICON)icon.GetHandle();
282
283 ICONINFO iconInfo;
284 if ( !::GetIconInfo(hicon, &iconInfo) )
285 {
286 wxLogLastError(wxT("GetIconInfo"));
287
288 return false;
289 }
290
291 wxBitmapRefData *refData = new wxBitmapRefData;
292 m_refData = refData;
293
294 int w = icon.GetWidth(),
295 h = icon.GetHeight();
296
297 refData->m_width = w;
298 refData->m_height = h;
299 refData->m_depth = wxDisplayDepth();
300
301 refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
302
303 #if wxUSE_WXDIB
304 // If the icon is 32 bits per pixel then it may have alpha channel data,
305 // although there are some icons that are 32 bpp but have no alpha... So
306 // convert to a DIB and manually check the 4th byte for each pixel.
307 BITMAP bm;
308 if ( ::GetObject(iconInfo.hbmColor, sizeof(BITMAP), (LPVOID)&bm)
309 && bm.bmBitsPixel == 32)
310 {
311 wxDIB dib(iconInfo.hbmColor);
312 if (dib.IsOk())
313 {
314 unsigned char* pixels = dib.GetData();
315 for (int idx=0; idx<w*h*4; idx+=4)
316 {
317 if (pixels[idx+3] != 0)
318 {
319 // If there is an alpha byte that is non-zero then set the
320 // alpha flag and bail out of the loop.
321 refData->m_hasAlpha = true;
322 break;
323 }
324 }
325 }
326 }
327 #endif
328 if ( !refData->m_hasAlpha )
329 {
330 // the mask returned by GetIconInfo() is inverted compared to the usual
331 // wxWin convention
332 refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
333 }
334
335 // delete the old one now as we don't need it any more
336 ::DeleteObject(iconInfo.hbmMask);
337
338 return true;
339 #else
340 wxUnusedVar(icon);
341 return false;
342 #endif
343 }
344
345 #endif // Win32
346
347 bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
348 {
349 UnRef();
350
351 if ( !cursor.Ok() )
352 return false;
353
354 return CopyFromIconOrCursor(cursor);
355 }
356
357 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
358 {
359 UnRef();
360
361 if ( !icon.Ok() )
362 return false;
363
364 return CopyFromIconOrCursor(icon);
365 }
366
367 #ifndef NEVER_USE_DIB
368
369 bool wxBitmap::CopyFromDIB(const wxDIB& dib)
370 {
371 wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
372
373 #ifdef SOMETIMES_USE_DIB
374 HBITMAP hbitmap = dib.CreateDDB();
375 if ( !hbitmap )
376 return false;
377 #else // ALWAYS_USE_DIB
378 HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
379 #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
380
381 UnRef();
382
383 wxBitmapRefData *refData = new wxBitmapRefData;
384 m_refData = refData;
385
386 refData->m_width = dib.GetWidth();
387 refData->m_height = dib.GetHeight();
388 refData->m_depth = dib.GetDepth();
389
390 refData->m_hBitmap = (WXHBITMAP)hbitmap;
391
392 #if wxUSE_PALETTE
393 wxPalette *palette = dib.CreatePalette();
394 if ( palette )
395 {
396 refData->m_bitmapPalette = *palette;
397 }
398
399 delete palette;
400 #endif // wxUSE_PALETTE
401
402 return true;
403 }
404
405 #endif // NEVER_USE_DIB
406
407 wxBitmap::~wxBitmap()
408 {
409 }
410
411 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
412 {
413 #ifndef __WXMICROWIN__
414 wxBitmapRefData *refData = new wxBitmapRefData;
415 m_refData = refData;
416
417 refData->m_width = width;
418 refData->m_height = height;
419 refData->m_depth = depth;
420
421 char *data;
422 if ( depth == 1 )
423 {
424 // we assume that it is in XBM format which is not quite the same as
425 // the format CreateBitmap() wants because the order of bytes in the
426 // line is reversed!
427 const size_t bytesPerLine = (width + 7) / 8;
428 const size_t padding = bytesPerLine % 2;
429 const size_t len = height * ( padding + bytesPerLine );
430 data = (char *)malloc(len);
431 const char *src = bits;
432 char *dst = data;
433
434 for ( int rows = 0; rows < height; rows++ )
435 {
436 for ( size_t cols = 0; cols < bytesPerLine; cols++ )
437 {
438 unsigned char val = *src++;
439 unsigned char reversed = 0;
440
441 for ( int bits = 0; bits < 8; bits++)
442 {
443 reversed <<= 1;
444 reversed |= (unsigned char)(val & 0x01);
445 val >>= 1;
446 }
447 *dst++ = reversed;
448 }
449
450 if ( padding )
451 *dst++ = 0;
452 }
453 }
454 else
455 {
456 // bits should already be in Windows standard format
457 data = (char *)bits; // const_cast is harmless
458 }
459
460 HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
461 if ( !hbmp )
462 {
463 wxLogLastError(wxT("CreateBitmap"));
464 }
465
466 if ( data != bits )
467 {
468 free(data);
469 }
470
471 SetHBITMAP((WXHBITMAP)hbmp);
472 #endif
473 }
474
475 // Create from XPM data
476 bool wxBitmap::CreateFromXpm(const char **data)
477 {
478 #if wxUSE_IMAGE && wxUSE_XPM && wxUSE_WXDIB
479 wxCHECK_MSG( data != NULL, false, wxT("invalid bitmap data") );
480
481 wxXPMDecoder decoder;
482 wxImage img = decoder.ReadData(data);
483 wxCHECK_MSG( img.Ok(), false, wxT("invalid bitmap data") );
484
485 *this = wxBitmap(img);
486 return true;
487 #else
488 wxUnusedVar(data);
489 return false;
490 #endif
491 }
492
493 wxBitmap::wxBitmap(int w, int h, int d)
494 {
495 (void)Create(w, h, d);
496 }
497
498 wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
499 {
500 (void)Create(w, h, dc);
501 }
502
503 wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
504 {
505 (void)Create(data, type, width, height, depth);
506 }
507
508 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
509 {
510 LoadFile(filename, (int)type);
511 }
512
513 bool wxBitmap::Create(int width, int height, int depth)
514 {
515 return DoCreate(width, height, depth, 0);
516 }
517
518 bool wxBitmap::Create(int width, int height, const wxDC& dc)
519 {
520 wxCHECK_MSG( dc.Ok(), false, _T("invalid HDC in wxBitmap::Create()") );
521
522 return DoCreate(width, height, -1, dc.GetHDC());
523 }
524
525 bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
526 {
527 UnRef();
528
529 m_refData = new wxBitmapRefData;
530
531 GetBitmapData()->m_width = w;
532 GetBitmapData()->m_height = h;
533
534 HBITMAP hbmp wxDUMMY_INITIALIZE(0);
535
536 #ifndef NEVER_USE_DIB
537 if ( wxShouldCreateDIB(w, h, d, hdc) )
538 {
539 if ( d == -1 )
540 {
541 // create DIBs without alpha channel by default
542 d = 24;
543 }
544
545 wxDIB dib(w, h, d);
546 if ( !dib.IsOk() )
547 return false;
548
549 // don't delete the DIB section in dib object dtor
550 hbmp = dib.Detach();
551
552 GetBitmapData()->m_isDIB = true;
553 GetBitmapData()->m_depth = d;
554 }
555 else // create a DDB
556 #endif // NEVER_USE_DIB
557 {
558 #ifndef ALWAYS_USE_DIB
559 #ifndef __WXMICROWIN__
560 if ( d > 0 )
561 {
562 hbmp = ::CreateBitmap(w, h, 1, d, NULL);
563 if ( !hbmp )
564 {
565 wxLogLastError(wxT("CreateBitmap"));
566 }
567
568 GetBitmapData()->m_depth = d;
569 }
570 else // d == 0, create bitmap compatible with the screen
571 #endif // !__WXMICROWIN__
572 {
573 ScreenHDC dc;
574 hbmp = ::CreateCompatibleBitmap(dc, w, h);
575 if ( !hbmp )
576 {
577 wxLogLastError(wxT("CreateCompatibleBitmap"));
578 }
579
580 GetBitmapData()->m_depth = wxDisplayDepth();
581 }
582 #endif // !ALWAYS_USE_DIB
583 }
584
585 SetHBITMAP((WXHBITMAP)hbmp);
586
587 return Ok();
588 }
589
590 #if wxUSE_IMAGE
591
592 // ----------------------------------------------------------------------------
593 // wxImage to/from conversions for Microwin
594 // ----------------------------------------------------------------------------
595
596 // Microwin versions are so different from normal ones that it really doesn't
597 // make sense to use #ifdefs inside the function bodies
598 #ifdef __WXMICROWIN__
599
600 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
601 {
602 // Set this to 1 to experiment with mask code,
603 // which currently doesn't work
604 #define USE_MASKS 0
605
606 m_refData = new wxBitmapRefData();
607
608 // Initial attempt at a simple-minded implementation.
609 // The bitmap will always be created at the screen depth,
610 // so the 'depth' argument is ignored.
611
612 HDC hScreenDC = ::GetDC(NULL);
613 int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
614
615 HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
616 HBITMAP hMaskBitmap = NULL;
617 HBITMAP hOldMaskBitmap = NULL;
618 HDC hMaskDC = NULL;
619 unsigned char maskR = 0;
620 unsigned char maskG = 0;
621 unsigned char maskB = 0;
622
623 // printf("Created bitmap %d\n", (int) hBitmap);
624 if (hBitmap == NULL)
625 {
626 ::ReleaseDC(NULL, hScreenDC);
627 return false;
628 }
629 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
630
631 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
632 ::ReleaseDC(NULL, hScreenDC);
633
634 // created an mono-bitmap for the possible mask
635 bool hasMask = image.HasMask();
636
637 if ( hasMask )
638 {
639 #if USE_MASKS
640 // FIXME: we should be able to pass bpp = 1, but
641 // GdBlit can't handle a different depth
642 #if 0
643 hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
644 #else
645 hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
646 #endif
647 maskR = image.GetMaskRed();
648 maskG = image.GetMaskGreen();
649 maskB = image.GetMaskBlue();
650
651 if (!hMaskBitmap)
652 {
653 hasMask = false;
654 }
655 else
656 {
657 hScreenDC = ::GetDC(NULL);
658 hMaskDC = ::CreateCompatibleDC(hScreenDC);
659 ::ReleaseDC(NULL, hScreenDC);
660
661 hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
662 }
663 #else
664 hasMask = false;
665 #endif
666 }
667
668 int i, j;
669 for (i = 0; i < image.GetWidth(); i++)
670 {
671 for (j = 0; j < image.GetHeight(); j++)
672 {
673 unsigned char red = image.GetRed(i, j);
674 unsigned char green = image.GetGreen(i, j);
675 unsigned char blue = image.GetBlue(i, j);
676
677 ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
678
679 if (hasMask)
680 {
681 // scan the bitmap for the transparent colour and set the corresponding
682 // pixels in the mask to BLACK and the rest to WHITE
683 if (maskR == red && maskG == green && maskB == blue)
684 ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
685 else
686 ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
687 }
688 }
689 }
690
691 ::SelectObject(hMemDC, hOldBitmap);
692 ::DeleteDC(hMemDC);
693 if (hasMask)
694 {
695 ::SelectObject(hMaskDC, hOldMaskBitmap);
696 ::DeleteDC(hMaskDC);
697
698 ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
699 }
700
701 SetWidth(image.GetWidth());
702 SetHeight(image.GetHeight());
703 SetDepth(screenDepth);
704 SetHBITMAP( (WXHBITMAP) hBitmap );
705
706 #if wxUSE_PALETTE
707 // Copy the palette from the source image
708 SetPalette(image.GetPalette());
709 #endif // wxUSE_PALETTE
710
711 return true;
712 }
713
714 wxImage wxBitmap::ConvertToImage() const
715 {
716 // Initial attempt at a simple-minded implementation.
717 // The bitmap will always be created at the screen depth,
718 // so the 'depth' argument is ignored.
719 // TODO: transparency (create a mask image)
720
721 if (!Ok())
722 {
723 wxFAIL_MSG( wxT("bitmap is invalid") );
724 return wxNullImage;
725 }
726
727 wxImage image;
728
729 wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
730
731 // create an wxImage object
732 int width = GetWidth();
733 int height = GetHeight();
734 image.Create( width, height );
735 unsigned char *data = image.GetData();
736 if( !data )
737 {
738 wxFAIL_MSG( wxT("could not allocate data for image") );
739 return wxNullImage;
740 }
741
742 HDC hScreenDC = ::GetDC(NULL);
743
744 HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
745 ::ReleaseDC(NULL, hScreenDC);
746
747 HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
748
749 HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
750
751 int i, j;
752 for (i = 0; i < GetWidth(); i++)
753 {
754 for (j = 0; j < GetHeight(); j++)
755 {
756 COLORREF color = ::GetPixel(hMemDC, i, j);
757 unsigned char red = GetRValue(color);
758 unsigned char green = GetGValue(color);
759 unsigned char blue = GetBValue(color);
760
761 image.SetRGB(i, j, red, green, blue);
762 }
763 }
764
765 ::SelectObject(hMemDC, hOldBitmap);
766 ::DeleteDC(hMemDC);
767
768 #if wxUSE_PALETTE
769 // Copy the palette from the source image
770 if (GetPalette())
771 image.SetPalette(* GetPalette());
772 #endif // wxUSE_PALETTE
773
774 return image;
775 }
776
777 #endif // __WXMICROWIN__
778
779 // ----------------------------------------------------------------------------
780 // wxImage to/from conversions
781 // ----------------------------------------------------------------------------
782
783 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
784 {
785 return CreateFromImage(image, depth, 0);
786 }
787
788 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
789 {
790 wxCHECK_MSG( dc.Ok(), false,
791 _T("invalid HDC in wxBitmap::CreateFromImage()") );
792
793 return CreateFromImage(image, -1, dc.GetHDC());
794 }
795
796 #if wxUSE_WXDIB
797
798 bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
799 {
800 wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
801
802 UnRef();
803
804 // first convert the image to DIB
805 const int h = image.GetHeight();
806 const int w = image.GetWidth();
807
808 wxDIB dib(image);
809 if ( !dib.IsOk() )
810 return false;
811
812 if ( depth == -1 )
813 depth = dib.GetDepth(); // Get depth from image if none specified
814
815 // store the bitmap parameters
816 wxBitmapRefData *refData = new wxBitmapRefData;
817 refData->m_width = w;
818 refData->m_height = h;
819 refData->m_hasAlpha = image.HasAlpha();
820
821 m_refData = refData;
822
823
824 // next either store DIB as is or create a DDB from it
825 HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
826
827 // are we going to use DIB?
828 //
829 // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
830 if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
831 {
832 // don't delete the DIB section in dib object dtor
833 hbitmap = dib.Detach();
834
835 refData->m_isDIB = true;
836 refData->m_depth = depth;
837 }
838 #ifndef ALWAYS_USE_DIB
839 else // we need to convert DIB to DDB
840 {
841 hbitmap = dib.CreateDDB((HDC)hdc);
842
843 refData->m_depth = depth;
844 }
845 #endif // !ALWAYS_USE_DIB
846
847 // validate this object
848 SetHBITMAP((WXHBITMAP)hbitmap);
849
850 // finally also set the mask if we have one
851 if ( image.HasMask() )
852 {
853 const size_t len = 2*((w+15)/16);
854 BYTE *src = image.GetData();
855 BYTE *data = new BYTE[h*len];
856 memset(data, 0, h*len);
857 BYTE r = image.GetMaskRed(),
858 g = image.GetMaskGreen(),
859 b = image.GetMaskBlue();
860 BYTE *dst = data;
861 for ( int y = 0; y < h; y++, dst += len )
862 {
863 BYTE *dstLine = dst;
864 BYTE mask = 0x80;
865 for ( int x = 0; x < w; x++, src += 3 )
866 {
867 if (src[0] != r || src[1] != g || src[2] != b)
868 *dstLine |= mask;
869
870 if ( (mask >>= 1) == 0 )
871 {
872 dstLine++;
873 mask = 0x80;
874 }
875 }
876 }
877
878 hbitmap = ::CreateBitmap(w, h, 1, 1, data);
879 if ( !hbitmap )
880 {
881 wxLogLastError(_T("CreateBitmap(mask)"));
882 }
883 else
884 {
885 SetMask(new wxMask((WXHBITMAP)hbitmap));
886 }
887
888 delete[] data;
889 }
890
891 return true;
892 }
893
894 wxImage wxBitmap::ConvertToImage() const
895 {
896 // convert DDB to DIB
897 wxDIB dib(*this);
898
899 if ( !dib.IsOk() )
900 {
901 return wxNullImage;
902 }
903
904 // and then DIB to our wxImage
905 wxImage image = dib.ConvertToImage();
906 if ( !image.Ok() )
907 {
908 return wxNullImage;
909 }
910
911 // now do the same for the mask, if we have any
912 HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
913 if ( hbmpMask )
914 {
915 wxDIB dibMask(hbmpMask);
916 if ( dibMask.IsOk() )
917 {
918 // TODO: use wxRawBitmap to iterate over DIB
919
920 // we hard code the mask colour for now but we could also make an
921 // effort (and waste time) to choose a colour not present in the
922 // image already to avoid having to fudge the pixels below --
923 // whether it's worth to do it is unclear however
924 static const int MASK_RED = 1;
925 static const int MASK_GREEN = 2;
926 static const int MASK_BLUE = 3;
927 static const int MASK_BLUE_REPLACEMENT = 2;
928
929 const int h = dibMask.GetHeight();
930 const int w = dibMask.GetWidth();
931 const int bpp = dibMask.GetDepth();
932 const int maskBytesPerPixel = bpp >> 3;
933 const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
934 unsigned char *data = image.GetData();
935
936 // remember that DIBs are stored in bottom to top order
937 unsigned char *
938 maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
939
940 for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
941 {
942 // traverse one mask DIB line
943 unsigned char *mask = maskLineStart;
944 for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
945 {
946 // should this pixel be transparent?
947 if ( *mask )
948 {
949 // no, check that it isn't transparent by accident
950 if ( (data[0] == MASK_RED) &&
951 (data[1] == MASK_GREEN) &&
952 (data[2] == MASK_BLUE) )
953 {
954 // we have to fudge the colour a bit to prevent
955 // this pixel from appearing transparent
956 data[2] = MASK_BLUE_REPLACEMENT;
957 }
958
959 data += 3;
960 }
961 else // yes, transparent pixel
962 {
963 *data++ = MASK_RED;
964 *data++ = MASK_GREEN;
965 *data++ = MASK_BLUE;
966 }
967 }
968 }
969
970 image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
971 }
972 }
973
974 return image;
975 }
976
977 #else // !wxUSE_WXDIB
978
979 bool
980 wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
981 int WXUNUSED(depth),
982 WXHDC WXUNUSED(hdc))
983 {
984 return false;
985 }
986
987 wxImage wxBitmap::ConvertToImage() const
988 {
989 return wxImage();
990 }
991
992 #endif // wxUSE_WXDIB/!wxUSE_WXDIB
993
994 #endif // wxUSE_IMAGE
995
996 // ----------------------------------------------------------------------------
997 // loading and saving bitmaps
998 // ----------------------------------------------------------------------------
999
1000 bool wxBitmap::LoadFile(const wxString& filename, long type)
1001 {
1002 UnRef();
1003
1004 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1005
1006 if ( handler )
1007 {
1008 m_refData = new wxBitmapRefData;
1009
1010 return handler->LoadFile(this, filename, type, -1, -1);
1011 }
1012 #if wxUSE_IMAGE && wxUSE_WXDIB
1013 else // no bitmap handler found
1014 {
1015 wxImage image;
1016 if ( image.LoadFile( filename, type ) && image.Ok() )
1017 {
1018 *this = wxBitmap(image);
1019
1020 return true;
1021 }
1022 }
1023 #endif // wxUSE_IMAGE
1024
1025 return false;
1026 }
1027
1028 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
1029 {
1030 UnRef();
1031
1032 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1033
1034 if ( !handler )
1035 {
1036 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1037
1038 return false;
1039 }
1040
1041 m_refData = new wxBitmapRefData;
1042
1043 return handler->Create(this, data, type, width, height, depth);
1044 }
1045
1046 bool wxBitmap::SaveFile(const wxString& filename,
1047 int type,
1048 const wxPalette *palette)
1049 {
1050 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1051
1052 if ( handler )
1053 {
1054 return handler->SaveFile(this, filename, type, palette);
1055 }
1056 #if wxUSE_IMAGE && wxUSE_WXDIB
1057 else // no bitmap handler found
1058 {
1059 // FIXME what about palette? shouldn't we use it?
1060 wxImage image = ConvertToImage();
1061 if ( image.Ok() )
1062 {
1063 return image.SaveFile(filename, type);
1064 }
1065 }
1066 #endif // wxUSE_IMAGE
1067
1068 return false;
1069 }
1070
1071 // ----------------------------------------------------------------------------
1072 // sub bitmap extraction
1073 // ----------------------------------------------------------------------------
1074
1075 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1076 {
1077 wxCHECK_MSG( Ok() &&
1078 (rect.x >= 0) && (rect.y >= 0) &&
1079 (rect.x+rect.width <= GetWidth()) &&
1080 (rect.y+rect.height <= GetHeight()),
1081 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1082
1083 wxBitmap ret( rect.width, rect.height, GetDepth() );
1084 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1085
1086 #ifndef __WXMICROWIN__
1087 // handle alpha channel, if any
1088 if (HasAlpha())
1089 ret.UseAlpha();
1090
1091 // copy bitmap data
1092 MemoryHDC dcSrc,
1093 dcDst;
1094
1095 {
1096 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1097 selectDst(dcDst, GetHbitmapOf(ret));
1098
1099 if ( !selectSrc || !selectDst )
1100 {
1101 wxLogLastError(_T("SelectObjct(hBitmap)"));
1102 }
1103
1104 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1105 dcSrc, rect.x, rect.y, SRCCOPY) )
1106 {
1107 wxLogLastError(_T("BitBlt"));
1108 }
1109 }
1110
1111 // copy mask if there is one
1112 if ( GetMask() )
1113 {
1114 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1115
1116 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1117 selectDst(dcDst, hbmpMask);
1118
1119 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1120 dcSrc, rect.x, rect.y, SRCCOPY) )
1121 {
1122 wxLogLastError(_T("BitBlt"));
1123 }
1124
1125 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1126 ret.SetMask(mask);
1127 }
1128 #endif // !__WXMICROWIN__
1129
1130 return ret;
1131 }
1132
1133 // ----------------------------------------------------------------------------
1134 // wxBitmap accessors
1135 // ----------------------------------------------------------------------------
1136
1137 #if wxUSE_PALETTE
1138 wxPalette* wxBitmap::GetPalette() const
1139 {
1140 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1141 : (wxPalette *) NULL;
1142 }
1143 #endif
1144
1145 wxMask *wxBitmap::GetMask() const
1146 {
1147 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1148 }
1149
1150 wxBitmap wxBitmap::GetMaskBitmap() const
1151 {
1152 wxBitmap bmp;
1153 wxMask *mask = GetMask();
1154 if ( mask )
1155 bmp.SetHBITMAP(mask->GetMaskBitmap());
1156 return bmp;
1157 }
1158
1159 #ifdef __WXDEBUG__
1160
1161 wxDC *wxBitmap::GetSelectedInto() const
1162 {
1163 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1164 }
1165
1166 #endif
1167
1168 #if WXWIN_COMPATIBILITY_2_4
1169
1170 int wxBitmap::GetQuality() const
1171 {
1172 return 0;
1173 }
1174
1175 #endif // WXWIN_COMPATIBILITY_2_4
1176
1177 void wxBitmap::UseAlpha()
1178 {
1179 if ( GetBitmapData() )
1180 GetBitmapData()->m_hasAlpha = true;
1181 }
1182
1183 bool wxBitmap::HasAlpha() const
1184 {
1185 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1186 }
1187
1188 // ----------------------------------------------------------------------------
1189 // wxBitmap setters
1190 // ----------------------------------------------------------------------------
1191
1192 #ifdef __WXDEBUG__
1193
1194 void wxBitmap::SetSelectedInto(wxDC *dc)
1195 {
1196 if ( GetBitmapData() )
1197 GetBitmapData()->m_selectedInto = dc;
1198 }
1199
1200 #endif
1201
1202 #if wxUSE_PALETTE
1203
1204 void wxBitmap::SetPalette(const wxPalette& palette)
1205 {
1206 AllocExclusive();
1207
1208 GetBitmapData()->m_bitmapPalette = palette;
1209 }
1210
1211 #endif // wxUSE_PALETTE
1212
1213 void wxBitmap::SetMask(wxMask *mask)
1214 {
1215 AllocExclusive();
1216
1217 GetBitmapData()->SetMask(mask);
1218 }
1219
1220 #if WXWIN_COMPATIBILITY_2_4
1221
1222 void wxBitmap::SetQuality(int WXUNUSED(quality))
1223 {
1224 }
1225
1226 #endif // WXWIN_COMPATIBILITY_2_4
1227
1228 // ----------------------------------------------------------------------------
1229 // raw bitmap access support
1230 // ----------------------------------------------------------------------------
1231
1232 #ifdef wxHAVE_RAW_BITMAP
1233 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1234 {
1235 #if wxUSE_WXDIB
1236 if ( !Ok() )
1237 {
1238 // no bitmap, no data (raw or otherwise)
1239 return NULL;
1240 }
1241
1242 // if we're already a DIB we can access our data directly, but if not we
1243 // need to convert this DDB to a DIB section and use it for raw access and
1244 // then convert it back
1245 HBITMAP hDIB;
1246 if ( !GetBitmapData()->m_isDIB )
1247 {
1248 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1249 _T("GetRawData() may be called only once") );
1250
1251 wxDIB *dib = new wxDIB(*this);
1252 if ( !dib->IsOk() )
1253 {
1254 delete dib;
1255
1256 return NULL;
1257 }
1258
1259 // we'll free it in UngetRawData()
1260 GetBitmapData()->m_dib = dib;
1261
1262 hDIB = dib->GetHandle();
1263 }
1264 else // we're a DIB
1265 {
1266 hDIB = GetHbitmap();
1267 }
1268
1269 DIBSECTION ds;
1270 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1271 {
1272 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1273
1274 return NULL;
1275 }
1276
1277 // check that the bitmap is in correct format
1278 if ( ds.dsBm.bmBitsPixel != bpp )
1279 {
1280 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1281
1282 return NULL;
1283 }
1284
1285 // ok, store the relevant info in wxPixelDataBase
1286 const LONG h = ds.dsBm.bmHeight;
1287
1288 data.m_width = ds.dsBm.bmWidth;
1289 data.m_height = h;
1290
1291 // remember that DIBs are stored in top to bottom order!
1292 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1293 // multiple of 2, as required by the documentation. So we use the official
1294 // formula, which we already use elsewhere.)
1295 const LONG bytesPerRow =
1296 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1297 data.m_stride = -bytesPerRow;
1298
1299 char *bits = (char *)ds.dsBm.bmBits;
1300 if ( h > 1 )
1301 {
1302 bits += (h - 1)*bytesPerRow;
1303 }
1304
1305 return bits;
1306 #else
1307 return NULL;
1308 #endif
1309 }
1310
1311 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1312 {
1313 #if wxUSE_WXDIB
1314 if ( !Ok() )
1315 return;
1316
1317 if ( !&dataBase )
1318 {
1319 // invalid data, don't crash -- but don't assert neither as we're
1320 // called automatically from wxPixelDataBase dtor and so there is no
1321 // way to prevent this from happening
1322 return;
1323 }
1324
1325 // if we're a DDB we need to convert DIB back to DDB now to make the
1326 // changes made via raw bitmap access effective
1327 if ( !GetBitmapData()->m_isDIB )
1328 {
1329 wxDIB *dib = GetBitmapData()->m_dib;
1330 GetBitmapData()->m_dib = NULL;
1331
1332 // TODO: convert
1333
1334 delete dib;
1335 }
1336 #endif // wxUSE_WXDIB
1337 }
1338 #endif // #ifdef wxHAVE_RAW_BITMAP
1339
1340 // ----------------------------------------------------------------------------
1341 // wxMask
1342 // ----------------------------------------------------------------------------
1343
1344 wxMask::wxMask()
1345 {
1346 m_maskBitmap = 0;
1347 }
1348
1349 // Construct a mask from a bitmap and a colour indicating
1350 // the transparent area
1351 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1352 {
1353 m_maskBitmap = 0;
1354 Create(bitmap, colour);
1355 }
1356
1357 // Construct a mask from a bitmap and a palette index indicating
1358 // the transparent area
1359 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1360 {
1361 m_maskBitmap = 0;
1362 Create(bitmap, paletteIndex);
1363 }
1364
1365 // Construct a mask from a mono bitmap (copies the bitmap).
1366 wxMask::wxMask(const wxBitmap& bitmap)
1367 {
1368 m_maskBitmap = 0;
1369 Create(bitmap);
1370 }
1371
1372 wxMask::~wxMask()
1373 {
1374 if ( m_maskBitmap )
1375 ::DeleteObject((HBITMAP) m_maskBitmap);
1376 }
1377
1378 // Create a mask from a mono bitmap (copies the bitmap).
1379 bool wxMask::Create(const wxBitmap& bitmap)
1380 {
1381 #ifndef __WXMICROWIN__
1382 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1383 _T("can't create mask from invalid or not monochrome bitmap") );
1384
1385 if ( m_maskBitmap )
1386 {
1387 ::DeleteObject((HBITMAP) m_maskBitmap);
1388 m_maskBitmap = 0;
1389 }
1390
1391 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1392 bitmap.GetWidth(),
1393 bitmap.GetHeight(),
1394 1, 1, 0
1395 );
1396 HDC srcDC = CreateCompatibleDC(0);
1397 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1398 HDC destDC = CreateCompatibleDC(0);
1399 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1400 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1401 SelectObject(srcDC, 0);
1402 DeleteDC(srcDC);
1403 SelectObject(destDC, 0);
1404 DeleteDC(destDC);
1405 return true;
1406 #else
1407 wxUnusedVar(bitmap);
1408 return false;
1409 #endif
1410 }
1411
1412 // Create a mask from a bitmap and a palette index indicating
1413 // the transparent area
1414 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1415 {
1416 if ( m_maskBitmap )
1417 {
1418 ::DeleteObject((HBITMAP) m_maskBitmap);
1419 m_maskBitmap = 0;
1420 }
1421
1422 #if wxUSE_PALETTE
1423 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1424 {
1425 unsigned char red, green, blue;
1426 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1427 {
1428 wxColour transparentColour(red, green, blue);
1429 return Create(bitmap, transparentColour);
1430 }
1431 }
1432 #endif // wxUSE_PALETTE
1433
1434 return false;
1435 }
1436
1437 // Create a mask from a bitmap and a colour indicating
1438 // the transparent area
1439 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1440 {
1441 #ifndef __WXMICROWIN__
1442 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1443
1444 if ( m_maskBitmap )
1445 {
1446 ::DeleteObject((HBITMAP) m_maskBitmap);
1447 m_maskBitmap = 0;
1448 }
1449
1450 int width = bitmap.GetWidth(),
1451 height = bitmap.GetHeight();
1452
1453 // scan the bitmap for the transparent colour and set the corresponding
1454 // pixels in the mask to BLACK and the rest to WHITE
1455 COLORREF maskColour = wxColourToPalRGB(colour);
1456 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1457
1458 HDC srcDC = ::CreateCompatibleDC(NULL);
1459 HDC destDC = ::CreateCompatibleDC(NULL);
1460 if ( !srcDC || !destDC )
1461 {
1462 wxLogLastError(wxT("CreateCompatibleDC"));
1463 }
1464
1465 bool ok = true;
1466
1467 // SelectObject() will fail
1468 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1469 _T("bitmap can't be selected in another DC") );
1470
1471 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1472 if ( !hbmpSrcOld )
1473 {
1474 wxLogLastError(wxT("SelectObject"));
1475
1476 ok = false;
1477 }
1478
1479 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1480 if ( !hbmpDstOld )
1481 {
1482 wxLogLastError(wxT("SelectObject"));
1483
1484 ok = false;
1485 }
1486
1487 if ( ok )
1488 {
1489 // this will create a monochrome bitmap with 0 points for the pixels
1490 // which have the same value as the background colour and 1 for the
1491 // others
1492 ::SetBkColor(srcDC, maskColour);
1493 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1494 }
1495
1496 ::SelectObject(srcDC, hbmpSrcOld);
1497 ::DeleteDC(srcDC);
1498 ::SelectObject(destDC, hbmpDstOld);
1499 ::DeleteDC(destDC);
1500
1501 return ok;
1502 #else // __WXMICROWIN__
1503 wxUnusedVar(bitmap);
1504 wxUnusedVar(colour);
1505 return false;
1506 #endif // __WXMICROWIN__/!__WXMICROWIN__
1507 }
1508
1509 // ----------------------------------------------------------------------------
1510 // wxBitmapHandler
1511 // ----------------------------------------------------------------------------
1512
1513 bool wxBitmapHandler::Create(wxGDIImage *image,
1514 void *data,
1515 long flags,
1516 int width, int height, int depth)
1517 {
1518 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1519
1520 return bitmap ? Create(bitmap, data, flags, width, height, depth) : false;
1521 }
1522
1523 bool wxBitmapHandler::Load(wxGDIImage *image,
1524 const wxString& name,
1525 long flags,
1526 int width, int height)
1527 {
1528 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1529
1530 return bitmap ? LoadFile(bitmap, name, flags, width, height) : false;
1531 }
1532
1533 bool wxBitmapHandler::Save(wxGDIImage *image,
1534 const wxString& name,
1535 int type)
1536 {
1537 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1538
1539 return bitmap ? SaveFile(bitmap, name, type) : false;
1540 }
1541
1542 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1543 void *WXUNUSED(data),
1544 long WXUNUSED(type),
1545 int WXUNUSED(width),
1546 int WXUNUSED(height),
1547 int WXUNUSED(depth))
1548 {
1549 return false;
1550 }
1551
1552 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1553 const wxString& WXUNUSED(name),
1554 long WXUNUSED(type),
1555 int WXUNUSED(desiredWidth),
1556 int WXUNUSED(desiredHeight))
1557 {
1558 return false;
1559 }
1560
1561 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1562 const wxString& WXUNUSED(name),
1563 int WXUNUSED(type),
1564 const wxPalette *WXUNUSED(palette))
1565 {
1566 return false;
1567 }
1568
1569 // ----------------------------------------------------------------------------
1570 // DIB functions
1571 // ----------------------------------------------------------------------------
1572
1573 #ifndef __WXMICROWIN__
1574 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1575 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1576 {
1577 unsigned long i, headerSize;
1578
1579 // Allocate space for a DIB header
1580 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1581 LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1582 LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1583
1584 GetPaletteEntries(hPal, 0, 256, lpPe);
1585
1586 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1587
1588 // Fill in the static parts of the DIB header
1589 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1590 lpDIBheader->bmiHeader.biWidth = xSize;
1591 lpDIBheader->bmiHeader.biHeight = ySize;
1592 lpDIBheader->bmiHeader.biPlanes = 1;
1593
1594 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1595 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1596 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1597 lpDIBheader->bmiHeader.biSizeImage = (xSize * abs(ySize) * bitsPerPixel) >> 3;
1598 lpDIBheader->bmiHeader.biClrUsed = 256;
1599
1600
1601 // Initialize the DIB palette
1602 for (i = 0; i < 256; i++) {
1603 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1604 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1605 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1606 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1607 }
1608
1609 *lpDIBHeader = lpDIBheader;
1610
1611 return true;
1612 }
1613
1614 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1615 {
1616 free(lpDIBHeader);
1617 }
1618 #endif
1619
1620 // ----------------------------------------------------------------------------
1621 // global helper functions implemented here
1622 // ----------------------------------------------------------------------------
1623
1624 // helper of wxBitmapToHICON/HCURSOR
1625 static
1626 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1627 bool iconWanted,
1628 int hotSpotX,
1629 int hotSpotY)
1630 {
1631 if ( !bmp.Ok() )
1632 {
1633 // we can't create an icon/cursor form nothing
1634 return 0;
1635 }
1636
1637 if ( bmp.HasAlpha() )
1638 {
1639 // Create an empty mask bitmap.
1640 // it doesn't seem to work if we mess with the mask at all.
1641 HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1642
1643 ICONINFO iconInfo;
1644 wxZeroMemory(iconInfo);
1645 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1646 if ( !iconWanted )
1647 {
1648 iconInfo.xHotspot = hotSpotX;
1649 iconInfo.yHotspot = hotSpotY;
1650 }
1651
1652 iconInfo.hbmMask = hMonoBitmap;
1653 iconInfo.hbmColor = GetHbitmapOf(bmp);
1654
1655 HICON hicon = ::CreateIconIndirect(&iconInfo);
1656
1657 ::DeleteObject(hMonoBitmap);
1658
1659 return hicon;
1660 }
1661
1662 wxMask* mask = bmp.GetMask();
1663
1664 if ( !mask )
1665 {
1666 // we must have a mask for an icon, so even if it's probably incorrect,
1667 // do create it (grey is the "standard" transparent colour)
1668 mask = new wxMask(bmp, *wxLIGHT_GREY);
1669 }
1670
1671 ICONINFO iconInfo;
1672 wxZeroMemory(iconInfo);
1673 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1674 if ( !iconWanted )
1675 {
1676 iconInfo.xHotspot = hotSpotX;
1677 iconInfo.yHotspot = hotSpotY;
1678 }
1679
1680 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1681 iconInfo.hbmColor = GetHbitmapOf(bmp);
1682
1683 // black out the transparent area to preserve background colour, because
1684 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1685 // the mask to the dest rect.
1686 {
1687 MemoryHDC dcSrc, dcDst;
1688 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1689 selectBitmap(dcDst, iconInfo.hbmColor);
1690
1691 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1692 dcSrc, 0, 0, SRCAND) )
1693 {
1694 wxLogLastError(_T("BitBlt"));
1695 }
1696 }
1697
1698 HICON hicon = ::CreateIconIndirect(&iconInfo);
1699
1700 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1701 {
1702 // we created the mask, now delete it
1703 delete mask;
1704 }
1705
1706 // delete the inverted mask bitmap we created as well
1707 ::DeleteObject(iconInfo.hbmMask);
1708
1709 return hicon;
1710 }
1711
1712 HICON wxBitmapToHICON(const wxBitmap& bmp)
1713 {
1714 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1715 }
1716
1717 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1718 {
1719 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1720 }
1721
1722 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1723 {
1724 #ifndef __WXMICROWIN__
1725 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1726
1727 // get width/height from the bitmap if not given
1728 if ( !w || !h )
1729 {
1730 BITMAP bm;
1731 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1732 w = bm.bmWidth;
1733 h = bm.bmHeight;
1734 }
1735
1736 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1737 HDC hdcDst = ::CreateCompatibleDC(NULL);
1738 if ( !hdcSrc || !hdcDst )
1739 {
1740 wxLogLastError(wxT("CreateCompatibleDC"));
1741 }
1742
1743 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1744 if ( !hbmpInvMask )
1745 {
1746 wxLogLastError(wxT("CreateBitmap"));
1747 }
1748
1749 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1750 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1751 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1752 hdcSrc, 0, 0,
1753 NOTSRCCOPY) )
1754 {
1755 wxLogLastError(wxT("BitBlt"));
1756 }
1757
1758 // Deselect objects
1759 SelectObject(hdcSrc,srcTmp);
1760 SelectObject(hdcDst,dstTmp);
1761
1762 ::DeleteDC(hdcSrc);
1763 ::DeleteDC(hdcDst);
1764
1765 return hbmpInvMask;
1766 #else
1767 return 0;
1768 #endif
1769 }
wxWidgets (Impactor)