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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 #if wxUSE_WXDIB
784
785 bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
786 {
787 return CreateFromImage(image, depth, 0);
788 }
789
790 bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
791 {
792 wxCHECK_MSG( dc.Ok(), false,
793 _T("invalid HDC in wxBitmap::CreateFromImage()") );
794
795 return CreateFromImage(image, -1, dc.GetHDC());
796 }
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 #endif // wxUSE_WXDIB
978
979 #endif // wxUSE_IMAGE
980
981 // ----------------------------------------------------------------------------
982 // loading and saving bitmaps
983 // ----------------------------------------------------------------------------
984
985 bool wxBitmap::LoadFile(const wxString& filename, long type)
986 {
987 UnRef();
988
989 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
990
991 if ( handler )
992 {
993 m_refData = new wxBitmapRefData;
994
995 return handler->LoadFile(this, filename, type, -1, -1);
996 }
997 #if wxUSE_IMAGE && wxUSE_WXDIB
998 else // no bitmap handler found
999 {
1000 wxImage image;
1001 if ( image.LoadFile( filename, type ) && image.Ok() )
1002 {
1003 *this = wxBitmap(image);
1004
1005 return true;
1006 }
1007 }
1008 #endif // wxUSE_IMAGE
1009
1010 return false;
1011 }
1012
1013 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
1014 {
1015 UnRef();
1016
1017 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1018
1019 if ( !handler )
1020 {
1021 wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
1022
1023 return false;
1024 }
1025
1026 m_refData = new wxBitmapRefData;
1027
1028 return handler->Create(this, data, type, width, height, depth);
1029 }
1030
1031 bool wxBitmap::SaveFile(const wxString& filename,
1032 int type,
1033 const wxPalette *palette)
1034 {
1035 wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
1036
1037 if ( handler )
1038 {
1039 return handler->SaveFile(this, filename, type, palette);
1040 }
1041 #if wxUSE_IMAGE && wxUSE_WXDIB
1042 else // no bitmap handler found
1043 {
1044 // FIXME what about palette? shouldn't we use it?
1045 wxImage image = ConvertToImage();
1046 if ( image.Ok() )
1047 {
1048 return image.SaveFile(filename, type);
1049 }
1050 }
1051 #endif // wxUSE_IMAGE
1052
1053 return false;
1054 }
1055
1056 // ----------------------------------------------------------------------------
1057 // sub bitmap extraction
1058 // ----------------------------------------------------------------------------
1059
1060 wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
1061 {
1062 wxCHECK_MSG( Ok() &&
1063 (rect.x >= 0) && (rect.y >= 0) &&
1064 (rect.x+rect.width <= GetWidth()) &&
1065 (rect.y+rect.height <= GetHeight()),
1066 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
1067
1068 wxBitmap ret( rect.width, rect.height, GetDepth() );
1069 wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
1070
1071 #ifndef __WXMICROWIN__
1072 // handle alpha channel, if any
1073 if (HasAlpha())
1074 ret.UseAlpha();
1075
1076 // copy bitmap data
1077 MemoryHDC dcSrc,
1078 dcDst;
1079
1080 {
1081 SelectInHDC selectSrc(dcSrc, GetHbitmap()),
1082 selectDst(dcDst, GetHbitmapOf(ret));
1083
1084 if ( !selectSrc || !selectDst )
1085 {
1086 wxLogLastError(_T("SelectObjct(hBitmap)"));
1087 }
1088
1089 if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
1090 dcSrc, rect.x, rect.y, SRCCOPY) )
1091 {
1092 wxLogLastError(_T("BitBlt"));
1093 }
1094 }
1095
1096 // copy mask if there is one
1097 if ( GetMask() )
1098 {
1099 HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
1100
1101 SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
1102 selectDst(dcDst, hbmpMask);
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 wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
1111 ret.SetMask(mask);
1112 }
1113 #endif // !__WXMICROWIN__
1114
1115 return ret;
1116 }
1117
1118 // ----------------------------------------------------------------------------
1119 // wxBitmap accessors
1120 // ----------------------------------------------------------------------------
1121
1122 #if wxUSE_PALETTE
1123 wxPalette* wxBitmap::GetPalette() const
1124 {
1125 return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
1126 : (wxPalette *) NULL;
1127 }
1128 #endif
1129
1130 wxMask *wxBitmap::GetMask() const
1131 {
1132 return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
1133 }
1134
1135 wxBitmap wxBitmap::GetMaskBitmap() const
1136 {
1137 wxBitmap bmp;
1138 wxMask *mask = GetMask();
1139 if ( mask )
1140 bmp.SetHBITMAP(mask->GetMaskBitmap());
1141 return bmp;
1142 }
1143
1144 #ifdef __WXDEBUG__
1145
1146 wxDC *wxBitmap::GetSelectedInto() const
1147 {
1148 return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
1149 }
1150
1151 #endif
1152
1153 #if WXWIN_COMPATIBILITY_2_4
1154
1155 int wxBitmap::GetQuality() const
1156 {
1157 return 0;
1158 }
1159
1160 #endif // WXWIN_COMPATIBILITY_2_4
1161
1162 void wxBitmap::UseAlpha()
1163 {
1164 if ( GetBitmapData() )
1165 GetBitmapData()->m_hasAlpha = true;
1166 }
1167
1168 bool wxBitmap::HasAlpha() const
1169 {
1170 return GetBitmapData() && GetBitmapData()->m_hasAlpha;
1171 }
1172
1173 // ----------------------------------------------------------------------------
1174 // wxBitmap setters
1175 // ----------------------------------------------------------------------------
1176
1177 #ifdef __WXDEBUG__
1178
1179 void wxBitmap::SetSelectedInto(wxDC *dc)
1180 {
1181 if ( GetBitmapData() )
1182 GetBitmapData()->m_selectedInto = dc;
1183 }
1184
1185 #endif
1186
1187 #if wxUSE_PALETTE
1188
1189 void wxBitmap::SetPalette(const wxPalette& palette)
1190 {
1191 AllocExclusive();
1192
1193 GetBitmapData()->m_bitmapPalette = palette;
1194 }
1195
1196 #endif // wxUSE_PALETTE
1197
1198 void wxBitmap::SetMask(wxMask *mask)
1199 {
1200 AllocExclusive();
1201
1202 GetBitmapData()->SetMask(mask);
1203 }
1204
1205 #if WXWIN_COMPATIBILITY_2_4
1206
1207 void wxBitmap::SetQuality(int WXUNUSED(quality))
1208 {
1209 }
1210
1211 #endif // WXWIN_COMPATIBILITY_2_4
1212
1213 // ----------------------------------------------------------------------------
1214 // raw bitmap access support
1215 // ----------------------------------------------------------------------------
1216
1217 #ifdef wxHAVE_RAW_BITMAP
1218 void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
1219 {
1220 #if wxUSE_WXDIB
1221 if ( !Ok() )
1222 {
1223 // no bitmap, no data (raw or otherwise)
1224 return NULL;
1225 }
1226
1227 // if we're already a DIB we can access our data directly, but if not we
1228 // need to convert this DDB to a DIB section and use it for raw access and
1229 // then convert it back
1230 HBITMAP hDIB;
1231 if ( !GetBitmapData()->m_isDIB )
1232 {
1233 wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
1234 _T("GetRawData() may be called only once") );
1235
1236 wxDIB *dib = new wxDIB(*this);
1237 if ( !dib->IsOk() )
1238 {
1239 delete dib;
1240
1241 return NULL;
1242 }
1243
1244 // we'll free it in UngetRawData()
1245 GetBitmapData()->m_dib = dib;
1246
1247 hDIB = dib->GetHandle();
1248 }
1249 else // we're a DIB
1250 {
1251 hDIB = GetHbitmap();
1252 }
1253
1254 DIBSECTION ds;
1255 if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
1256 {
1257 wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
1258
1259 return NULL;
1260 }
1261
1262 // check that the bitmap is in correct format
1263 if ( ds.dsBm.bmBitsPixel != bpp )
1264 {
1265 wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
1266
1267 return NULL;
1268 }
1269
1270 // ok, store the relevant info in wxPixelDataBase
1271 const LONG h = ds.dsBm.bmHeight;
1272
1273 data.m_width = ds.dsBm.bmWidth;
1274 data.m_height = h;
1275
1276 // remember that DIBs are stored in top to bottom order!
1277 // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
1278 // multiple of 2, as required by the documentation. So we use the official
1279 // formula, which we already use elsewhere.)
1280 const LONG bytesPerRow =
1281 wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
1282 data.m_stride = -bytesPerRow;
1283
1284 char *bits = (char *)ds.dsBm.bmBits;
1285 if ( h > 1 )
1286 {
1287 bits += (h - 1)*bytesPerRow;
1288 }
1289
1290 return bits;
1291 #else
1292 return NULL;
1293 #endif
1294 }
1295
1296 void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
1297 {
1298 #if wxUSE_WXDIB
1299 if ( !Ok() )
1300 return;
1301
1302 if ( !&dataBase )
1303 {
1304 // invalid data, don't crash -- but don't assert neither as we're
1305 // called automatically from wxPixelDataBase dtor and so there is no
1306 // way to prevent this from happening
1307 return;
1308 }
1309
1310 // if we're a DDB we need to convert DIB back to DDB now to make the
1311 // changes made via raw bitmap access effective
1312 if ( !GetBitmapData()->m_isDIB )
1313 {
1314 wxDIB *dib = GetBitmapData()->m_dib;
1315 GetBitmapData()->m_dib = NULL;
1316
1317 // TODO: convert
1318
1319 delete dib;
1320 }
1321 #endif // wxUSE_WXDIB
1322 }
1323 #endif // #ifdef wxHAVE_RAW_BITMAP
1324
1325 // ----------------------------------------------------------------------------
1326 // wxMask
1327 // ----------------------------------------------------------------------------
1328
1329 wxMask::wxMask()
1330 {
1331 m_maskBitmap = 0;
1332 }
1333
1334 // Construct a mask from a bitmap and a colour indicating
1335 // the transparent area
1336 wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
1337 {
1338 m_maskBitmap = 0;
1339 Create(bitmap, colour);
1340 }
1341
1342 // Construct a mask from a bitmap and a palette index indicating
1343 // the transparent area
1344 wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
1345 {
1346 m_maskBitmap = 0;
1347 Create(bitmap, paletteIndex);
1348 }
1349
1350 // Construct a mask from a mono bitmap (copies the bitmap).
1351 wxMask::wxMask(const wxBitmap& bitmap)
1352 {
1353 m_maskBitmap = 0;
1354 Create(bitmap);
1355 }
1356
1357 wxMask::~wxMask()
1358 {
1359 if ( m_maskBitmap )
1360 ::DeleteObject((HBITMAP) m_maskBitmap);
1361 }
1362
1363 // Create a mask from a mono bitmap (copies the bitmap).
1364 bool wxMask::Create(const wxBitmap& bitmap)
1365 {
1366 #ifndef __WXMICROWIN__
1367 wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
1368 _T("can't create mask from invalid or not monochrome bitmap") );
1369
1370 if ( m_maskBitmap )
1371 {
1372 ::DeleteObject((HBITMAP) m_maskBitmap);
1373 m_maskBitmap = 0;
1374 }
1375
1376 m_maskBitmap = (WXHBITMAP) CreateBitmap(
1377 bitmap.GetWidth(),
1378 bitmap.GetHeight(),
1379 1, 1, 0
1380 );
1381 HDC srcDC = CreateCompatibleDC(0);
1382 SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
1383 HDC destDC = CreateCompatibleDC(0);
1384 SelectObject(destDC, (HBITMAP) m_maskBitmap);
1385 BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
1386 SelectObject(srcDC, 0);
1387 DeleteDC(srcDC);
1388 SelectObject(destDC, 0);
1389 DeleteDC(destDC);
1390 return true;
1391 #else
1392 wxUnusedVar(bitmap);
1393 return false;
1394 #endif
1395 }
1396
1397 // Create a mask from a bitmap and a palette index indicating
1398 // the transparent area
1399 bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
1400 {
1401 if ( m_maskBitmap )
1402 {
1403 ::DeleteObject((HBITMAP) m_maskBitmap);
1404 m_maskBitmap = 0;
1405 }
1406
1407 #if wxUSE_PALETTE
1408 if (bitmap.Ok() && bitmap.GetPalette()->Ok())
1409 {
1410 unsigned char red, green, blue;
1411 if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
1412 {
1413 wxColour transparentColour(red, green, blue);
1414 return Create(bitmap, transparentColour);
1415 }
1416 }
1417 #endif // wxUSE_PALETTE
1418
1419 return false;
1420 }
1421
1422 // Create a mask from a bitmap and a colour indicating
1423 // the transparent area
1424 bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
1425 {
1426 #ifndef __WXMICROWIN__
1427 wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
1428
1429 if ( m_maskBitmap )
1430 {
1431 ::DeleteObject((HBITMAP) m_maskBitmap);
1432 m_maskBitmap = 0;
1433 }
1434
1435 int width = bitmap.GetWidth(),
1436 height = bitmap.GetHeight();
1437
1438 // scan the bitmap for the transparent colour and set the corresponding
1439 // pixels in the mask to BLACK and the rest to WHITE
1440 COLORREF maskColour = wxColourToPalRGB(colour);
1441 m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
1442
1443 HDC srcDC = ::CreateCompatibleDC(NULL);
1444 HDC destDC = ::CreateCompatibleDC(NULL);
1445 if ( !srcDC || !destDC )
1446 {
1447 wxLogLastError(wxT("CreateCompatibleDC"));
1448 }
1449
1450 bool ok = true;
1451
1452 // SelectObject() will fail
1453 wxASSERT_MSG( !bitmap.GetSelectedInto(),
1454 _T("bitmap can't be selected in another DC") );
1455
1456 HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
1457 if ( !hbmpSrcOld )
1458 {
1459 wxLogLastError(wxT("SelectObject"));
1460
1461 ok = false;
1462 }
1463
1464 HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
1465 if ( !hbmpDstOld )
1466 {
1467 wxLogLastError(wxT("SelectObject"));
1468
1469 ok = false;
1470 }
1471
1472 if ( ok )
1473 {
1474 // this will create a monochrome bitmap with 0 points for the pixels
1475 // which have the same value as the background colour and 1 for the
1476 // others
1477 ::SetBkColor(srcDC, maskColour);
1478 ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
1479 }
1480
1481 ::SelectObject(srcDC, hbmpSrcOld);
1482 ::DeleteDC(srcDC);
1483 ::SelectObject(destDC, hbmpDstOld);
1484 ::DeleteDC(destDC);
1485
1486 return ok;
1487 #else // __WXMICROWIN__
1488 wxUnusedVar(bitmap);
1489 wxUnusedVar(colour);
1490 return false;
1491 #endif // __WXMICROWIN__/!__WXMICROWIN__
1492 }
1493
1494 // ----------------------------------------------------------------------------
1495 // wxBitmapHandler
1496 // ----------------------------------------------------------------------------
1497
1498 bool wxBitmapHandler::Create(wxGDIImage *image,
1499 void *data,
1500 long flags,
1501 int width, int height, int depth)
1502 {
1503 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1504
1505 return bitmap ? Create(bitmap, data, flags, width, height, depth) : false;
1506 }
1507
1508 bool wxBitmapHandler::Load(wxGDIImage *image,
1509 const wxString& name,
1510 long flags,
1511 int width, int height)
1512 {
1513 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1514
1515 return bitmap ? LoadFile(bitmap, name, flags, width, height) : false;
1516 }
1517
1518 bool wxBitmapHandler::Save(wxGDIImage *image,
1519 const wxString& name,
1520 int type)
1521 {
1522 wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
1523
1524 return bitmap ? SaveFile(bitmap, name, type) : false;
1525 }
1526
1527 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
1528 void *WXUNUSED(data),
1529 long WXUNUSED(type),
1530 int WXUNUSED(width),
1531 int WXUNUSED(height),
1532 int WXUNUSED(depth))
1533 {
1534 return false;
1535 }
1536
1537 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
1538 const wxString& WXUNUSED(name),
1539 long WXUNUSED(type),
1540 int WXUNUSED(desiredWidth),
1541 int WXUNUSED(desiredHeight))
1542 {
1543 return false;
1544 }
1545
1546 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
1547 const wxString& WXUNUSED(name),
1548 int WXUNUSED(type),
1549 const wxPalette *WXUNUSED(palette))
1550 {
1551 return false;
1552 }
1553
1554 // ----------------------------------------------------------------------------
1555 // DIB functions
1556 // ----------------------------------------------------------------------------
1557
1558 #ifndef __WXMICROWIN__
1559 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
1560 HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
1561 {
1562 unsigned long i, headerSize;
1563
1564 // Allocate space for a DIB header
1565 headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
1566 LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
1567 LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
1568
1569 GetPaletteEntries(hPal, 0, 256, lpPe);
1570
1571 memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
1572
1573 // Fill in the static parts of the DIB header
1574 lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
1575 lpDIBheader->bmiHeader.biWidth = xSize;
1576 lpDIBheader->bmiHeader.biHeight = ySize;
1577 lpDIBheader->bmiHeader.biPlanes = 1;
1578
1579 // this value must be 1, 4, 8 or 24 so PixelDepth can only be
1580 lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
1581 lpDIBheader->bmiHeader.biCompression = BI_RGB;
1582 lpDIBheader->bmiHeader.biSizeImage = (xSize * abs(ySize) * bitsPerPixel) >> 3;
1583 lpDIBheader->bmiHeader.biClrUsed = 256;
1584
1585
1586 // Initialize the DIB palette
1587 for (i = 0; i < 256; i++) {
1588 lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
1589 lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
1590 lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
1591 lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
1592 }
1593
1594 *lpDIBHeader = lpDIBheader;
1595
1596 return true;
1597 }
1598
1599 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
1600 {
1601 free(lpDIBHeader);
1602 }
1603 #endif
1604
1605 // ----------------------------------------------------------------------------
1606 // global helper functions implemented here
1607 // ----------------------------------------------------------------------------
1608
1609 // helper of wxBitmapToHICON/HCURSOR
1610 static
1611 HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
1612 bool iconWanted,
1613 int hotSpotX,
1614 int hotSpotY)
1615 {
1616 if ( !bmp.Ok() )
1617 {
1618 // we can't create an icon/cursor form nothing
1619 return 0;
1620 }
1621
1622 if ( bmp.HasAlpha() )
1623 {
1624 // Create an empty mask bitmap.
1625 // it doesn't seem to work if we mess with the mask at all.
1626 HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
1627
1628 ICONINFO iconInfo;
1629 wxZeroMemory(iconInfo);
1630 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1631 if ( !iconWanted )
1632 {
1633 iconInfo.xHotspot = hotSpotX;
1634 iconInfo.yHotspot = hotSpotY;
1635 }
1636
1637 iconInfo.hbmMask = hMonoBitmap;
1638 iconInfo.hbmColor = GetHbitmapOf(bmp);
1639
1640 HICON hicon = ::CreateIconIndirect(&iconInfo);
1641
1642 ::DeleteObject(hMonoBitmap);
1643
1644 return hicon;
1645 }
1646
1647 wxMask* mask = bmp.GetMask();
1648
1649 if ( !mask )
1650 {
1651 // we must have a mask for an icon, so even if it's probably incorrect,
1652 // do create it (grey is the "standard" transparent colour)
1653 mask = new wxMask(bmp, *wxLIGHT_GREY);
1654 }
1655
1656 ICONINFO iconInfo;
1657 wxZeroMemory(iconInfo);
1658 iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
1659 if ( !iconWanted )
1660 {
1661 iconInfo.xHotspot = hotSpotX;
1662 iconInfo.yHotspot = hotSpotY;
1663 }
1664
1665 iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1666 iconInfo.hbmColor = GetHbitmapOf(bmp);
1667
1668 // black out the transparent area to preserve background colour, because
1669 // Windows blits the original bitmap using SRCINVERT (XOR) after applying
1670 // the mask to the dest rect.
1671 {
1672 MemoryHDC dcSrc, dcDst;
1673 SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
1674 selectBitmap(dcDst, iconInfo.hbmColor);
1675
1676 if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
1677 dcSrc, 0, 0, SRCAND) )
1678 {
1679 wxLogLastError(_T("BitBlt"));
1680 }
1681 }
1682
1683 HICON hicon = ::CreateIconIndirect(&iconInfo);
1684
1685 if ( !bmp.GetMask() && !bmp.HasAlpha() )
1686 {
1687 // we created the mask, now delete it
1688 delete mask;
1689 }
1690
1691 // delete the inverted mask bitmap we created as well
1692 ::DeleteObject(iconInfo.hbmMask);
1693
1694 return hicon;
1695 }
1696
1697 HICON wxBitmapToHICON(const wxBitmap& bmp)
1698 {
1699 return wxBitmapToIconOrCursor(bmp, true, 0, 0);
1700 }
1701
1702 HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
1703 {
1704 return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
1705 }
1706
1707 HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
1708 {
1709 #ifndef __WXMICROWIN__
1710 wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
1711
1712 // get width/height from the bitmap if not given
1713 if ( !w || !h )
1714 {
1715 BITMAP bm;
1716 ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
1717 w = bm.bmWidth;
1718 h = bm.bmHeight;
1719 }
1720
1721 HDC hdcSrc = ::CreateCompatibleDC(NULL);
1722 HDC hdcDst = ::CreateCompatibleDC(NULL);
1723 if ( !hdcSrc || !hdcDst )
1724 {
1725 wxLogLastError(wxT("CreateCompatibleDC"));
1726 }
1727
1728 HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
1729 if ( !hbmpInvMask )
1730 {
1731 wxLogLastError(wxT("CreateBitmap"));
1732 }
1733
1734 HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
1735 HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
1736 if ( !::BitBlt(hdcDst, 0, 0, w, h,
1737 hdcSrc, 0, 0,
1738 NOTSRCCOPY) )
1739 {
1740 wxLogLastError(wxT("BitBlt"));
1741 }
1742
1743 // Deselect objects
1744 SelectObject(hdcSrc,srcTmp);
1745 SelectObject(hdcDst,dstTmp);
1746
1747 ::DeleteDC(hdcSrc);
1748 ::DeleteDC(hdcDst);
1749
1750 return hbmpInvMask;
1751 #else
1752 return 0;
1753 #endif
1754 }
wxWidgets (Impactor)