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[wxWidgets.git] / src / msw / dib.cpp
1 /*******************************************************************************
2 * *
3 * MODULE : DIB.CC *
4 * *
5 * DESCRIPTION : Routines for dealing with Device Independent Bitmaps. *
6 * *
7 * FUNCTIONS : *
8 * *
9 * wxReadDIB() - Reads a DIB *
10 * *
11 * WriteDIB() - Writes a global handle in CF_DIB format*
12 * to a file. *
13 * *
14 * wxPaletteSize() - Calculates the palette size in bytes *
15 * of given DIB *
16 * *
17 * DibNumColors() - Determines the number of colors in DIB *
18 * *
19 * DibFromBitmap() - Creates a DIB repr. the DDB passed in. *
20 * *
21 * *
22 * lread() - Private routine to read more than 64k *
23 * *
24 * lwrite() - Private routine to write more than 64k *
25 * *
26 *******************************************************************************/
27
28 // For compilers that support precompilation, includes "wx.h".
29 #include "wx/wxprec.h"
30
31 #if defined(__BORLANDC__)
32 #pragma hdrstop
33 #endif
34
35 #ifndef WX_PRECOMP
36 #include "wx/bitmap.h"
37 #include "wx/log.h"
38 #include "wx/intl.h"
39 #endif
40
41 #include <windows.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44
45 #if !defined(__MWERKS__) && !defined(__SALFORDC__)
46 #include <memory.h>
47 #endif
48
49 #include "wx/msw/dib.h"
50
51 #ifdef __GNUWIN32_OLD__
52 #include "wx/msw/gnuwin32/extra.h"
53 #endif
54
55 #ifndef SEEK_CUR
56 /* flags for _lseek */
57 #define SEEK_CUR 1
58 #define SEEK_END 2
59 #define SEEK_SET 0
60 #endif
61
62 #define MAXREAD 32768 /* Number of bytes to be read during */
63 /* each read operation. */
64
65 /* Header signatutes for various resources */
66 #define BFT_ICON 0x4349 /* 'IC' */
67 #define BFT_BITMAP 0x4d42 /* 'BM' */
68 #define BFT_CURSOR 0x5450 /* 'PT(' */
69
70 /* macro to determine if resource is a DIB */
71 #define ISDIB(bft) ((bft) == BFT_BITMAP)
72
73 /* Macro to align given value to the closest DWORD (unsigned long ) */
74 #define ALIGNULONG(i) ((i+3)/4*4)
75
76 /* Macro to determine to round off the given value to the closest byte */
77 #define WIDTHBYTES(i) ((i+31)/32*4)
78
79 #define PALVERSION 0x300
80 #define MAXPALETTE 256 /* max. # supported palette entries */
81
82 static DWORD PASCAL lread(int fh, VOID FAR *pv, DWORD ul);
83 static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul);
84
85 static BOOL WriteDIB (LPTSTR szFile,HANDLE hdib);
86 WORD wxPaletteSize (VOID FAR * pv); // This is non-static as some apps use it externally
87 static WORD DibNumColors (VOID FAR * pv);
88 // HANDLE DibFromBitmap (HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal);
89 static BOOL PASCAL MakeBitmapAndPalette(HDC,HANDLE,HPALETTE *,HBITMAP *);
90
91 /****************************************************************************
92 * *
93 * FUNCTION : WriteDIB(LPSTR szFile,HANDLE hdib) *
94 * *
95 * PURPOSE : Write a global handle in CF_DIB format to a file. *
96 * *
97 * RETURNS : TRUE - if successful. *
98 * FALSE - otherwise *
99 * *
100 ****************************************************************************/
101
102 static BOOL WriteDIB(LPTSTR szFile, HANDLE hdib)
103 {
104 BITMAPFILEHEADER hdr;
105 LPBITMAPINFOHEADER lpbi;
106 int fh;
107 OFSTRUCT of;
108
109 if (!hdib)
110 return FALSE;
111
112 fh = OpenFile(wxConvertWX2MB(szFile), &of, OF_CREATE | OF_READWRITE);
113 if (fh == -1)
114 return FALSE;
115
116 #ifdef __WINDOWS_386__
117 lpbi = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hdib));
118 #else
119 lpbi = (LPBITMAPINFOHEADER) GlobalLock(hdib);
120 #endif
121 /* Fill in the fields of the file header */
122 hdr.bfType = BFT_BITMAP;
123 hdr.bfSize = GlobalSize(hdib) + sizeof(BITMAPFILEHEADER);
124 hdr.bfReserved1 = 0;
125 hdr.bfReserved2 = 0;
126 hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + lpbi->biSize +
127 wxPaletteSize(lpbi);
128
129 /* Write the file header */
130 _lwrite(fh, (LPSTR) &hdr, sizeof(BITMAPFILEHEADER));
131
132 /* Write the DIB header and the bits */
133 lwrite(fh, (LPSTR) lpbi, GlobalSize(hdib));
134
135 GlobalUnlock(hdib);
136 _lclose(fh);
137 return TRUE;
138 }
139
140 /****************************************************************************
141 * *
142 * FUNCTION : wxPaletteSize(VOID FAR * pv) *
143 * *
144 * PURPOSE : Calculates the palette size in bytes. If the info. block *
145 * is of the BITMAPCOREHEADER type, the number of colors is *
146 * multiplied by 3 to give the palette size, otherwise the *
147 * number of colors is multiplied by 4. *
148 * *
149 * RETURNS : Palette size in number of bytes. *
150 * *
151 ****************************************************************************/
152
153 WORD wxPaletteSize(VOID FAR * pv)
154 {
155 LPBITMAPINFOHEADER lpbi;
156 WORD NumColors;
157
158 lpbi = (LPBITMAPINFOHEADER) pv;
159 NumColors = DibNumColors(lpbi);
160
161 if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
162 return (WORD)(NumColors * sizeof(RGBTRIPLE));
163 else
164 return (WORD)(NumColors * sizeof(RGBQUAD));
165 }
166
167 /****************************************************************************
168 * *
169 * FUNCTION : DibNumColors(VOID FAR * pv) *
170 * *
171 * PURPOSE : Determines the number of colors in the DIB by looking at *
172 * the BitCount filed in the info block. *
173 * *
174 * RETURNS : The number of colors in the DIB. *
175 * *
176 ****************************************************************************/
177
178 static WORD DibNumColors(VOID FAR *pv)
179 {
180 int bits;
181 BITMAPINFOHEADER *lpbi;
182 BITMAPCOREHEADER *lpbc;
183
184 lpbi = ((BITMAPINFOHEADER*) pv);
185 lpbc = ((BITMAPCOREHEADER*) pv);
186
187 /* With the BITMAPINFO format headers, the size of the palette
188 * is in biClrUsed, whereas in the BITMAPCORE - style headers, it
189 * is dependent on the bits per pixel ( = 2 raised to the power of
190 * bits/pixel).
191 */
192 if (lpbi->biSize != sizeof(BITMAPCOREHEADER)) {
193 if (lpbi->biClrUsed != 0)
194 return (WORD) lpbi->biClrUsed;
195 bits = lpbi->biBitCount;
196 }
197 else
198 bits = lpbc->bcBitCount;
199
200 switch (bits) {
201 case 1:
202 return 2;
203 case 4:
204 return 16;
205 case 8:
206 return 256;
207 default:
208 /* A 24 bitcount DIB has no color table */
209 return 0;
210 }
211 }
212
213 /****************************************************************************
214 * *
215 * FUNCTION : DibFromBitmap() *
216 * *
217 * PURPOSE : Will create a global memory block in DIB format that *
218 * represents the Device-dependent bitmap (DDB) passed in. *
219 * *
220 * RETURNS : A handle to the DIB *
221 * *
222 ****************************************************************************/
223
224 #if NOTHING
225 static HANDLE DibFromBitmap(HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal)
226 {
227 BITMAP bm;
228 BITMAPINFOHEADER bi;
229 BITMAPINFOHEADER FAR *lpbi;
230 DWORD dwLen;
231 HANDLE hdib;
232 HANDLE h;
233 HDC hdc;
234
235 if (!hbm)
236 return NULL;
237
238 if (hpal == NULL)
239 hpal = GetStockObject(DEFAULT_PALETTE);
240
241 GetObject(hbm, sizeof (bm), (LPSTR) &bm);
242
243 if (biBits == 0)
244 biBits = bm.bmPlanes * bm.bmBitsPixel;
245
246 bi.biSize = sizeof(BITMAPINFOHEADER);
247 bi.biWidth = bm.bmWidth;
248 bi.biHeight = bm.bmHeight;
249 bi.biPlanes = 1;
250 bi.biBitCount = biBits;
251 bi.biCompression = biStyle;
252 bi.biSizeImage = 0;
253 bi.biXPelsPerMeter = 0;
254 bi.biYPelsPerMeter = 0;
255 bi.biClrUsed = 0;
256 bi.biClrImportant = 0;
257
258 dwLen = bi.biSize + wxPaletteSize(&bi);
259
260 hdc = GetDC((HWND) NULL);
261 hpal = SelectPalette(hdc, hpal, FALSE);
262 RealizePalette(hdc);
263
264 hdib = GlobalAlloc(GHND, dwLen);
265
266 if (!hdib) {
267 SelectPalette(hdc, hpal, FALSE);
268 ReleaseDC(NULL, hdc);
269 return NULL;
270 }
271
272 #ifdef __WINDOWS_386__
273 lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
274 #else
275 lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
276 #endif
277
278 *lpbi = bi;
279
280 /* call GetDIBits with a NULL lpBits param, so it will calculate the
281 * biSizeImage field for us
282 */
283 GetDIBits(hdc, hbm, 0, (WORD) bi.biHeight,
284 NULL, (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);
285
286 bi = *lpbi;
287 GlobalUnlock(hdib);
288
289 /* If the driver did not fill in the biSizeImage field, make one up */
290 if (bi.biSizeImage == 0) {
291 bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
292
293 if (biStyle != BI_RGB)
294 bi.biSizeImage = (bi.biSizeImage * 3) / 2;
295 }
296
297 /* realloc the buffer big enough to hold all the bits */
298 dwLen = bi.biSize + wxPaletteSize(&bi) + bi.biSizeImage;
299 if (h = GlobalReAlloc(hdib, dwLen, 0))
300 hdib = h;
301 else {
302 GlobalFree(hdib);
303 hdib = NULL;
304
305 SelectPalette(hdc, hpal, FALSE);
306 ReleaseDC(NULL, hdc);
307 return hdib;
308 }
309
310 /* call GetDIBits with a NON-NULL lpBits param, and actualy get the
311 * bits this time
312 */
313 #ifdef __WINDOWS_386__
314 lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
315 #else
316 lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
317 #endif
318
319 if (GetDIBits(hdc,
320 hbm,
321 0,
322 (WORD) bi.biHeight,
323 (LPSTR) lpbi + (WORD) lpbi->biSize + wxPaletteSize(lpbi),
324 (LPBITMAPINFO) lpbi, DIB_RGB_COLORS) == 0) {
325 GlobalUnlock(hdib);
326 hdib = NULL;
327 SelectPalette(hdc, hpal, FALSE);
328 ReleaseDC((HWND) NULL, hdc);
329 return NULL;
330 }
331
332 bi = *lpbi;
333 GlobalUnlock(hdib);
334
335 SelectPalette(hdc, hpal, FALSE);
336 ReleaseDC(NULL, hdc);
337 return hdib;
338 }
339 #endif
340
341 /************* PRIVATE ROUTINES TO READ/WRITE MORE THAN 64K ***************/
342 /****************************************************************************
343 * *
344 * FUNCTION : lread(int fh, VOID FAR *pv, DWORD ul) *
345 * *
346 * PURPOSE : Reads data in steps of 32k till all the data has been read.*
347 * *
348 * RETURNS : 0 - If read did not proceed correctly. *
349 * number of bytes read otherwise. *
350 * *
351 ****************************************************************************/
352
353 static DWORD PASCAL lread(int fh, void far *pv, DWORD ul)
354 {
355 DWORD ulT = ul;
356 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
357 BYTE *hp = (BYTE *) pv;
358 #else
359 BYTE huge *hp = (BYTE huge *) pv;
360 #endif
361 while (ul > (DWORD) MAXREAD) {
362 if (_lread(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
363 return 0;
364 ul -= MAXREAD;
365 hp += MAXREAD;
366 }
367 if (_lread(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
368 return 0;
369 return ulT;
370 }
371
372 /****************************************************************************
373 * *
374 * FUNCTION : lwrite(int fh, VOID FAR *pv, DWORD ul) *
375 * *
376 * PURPOSE : Writes data in steps of 32k till all the data is written. *
377 * *
378 * RETURNS : 0 - If write did not proceed correctly. *
379 * number of bytes written otherwise. *
380 * *
381 ****************************************************************************/
382
383 static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul)
384 {
385 DWORD ulT = ul;
386 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
387 BYTE *hp = (BYTE *) pv;
388 #else
389 BYTE huge *hp = (BYTE huge *) pv;
390 #endif
391 while (ul > MAXREAD) {
392 if (_lwrite(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
393 return 0;
394 ul -= MAXREAD;
395 hp += MAXREAD;
396 }
397 if (_lwrite(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
398 return 0;
399 return ulT;
400 }
401
402 /****************************************************************************
403 *
404 * FUNCTION : ReadDIB(hWnd)
405 *
406 * PURPOSE : Reads a DIB from a file, obtains a handle to its
407 * BITMAPINFO struct. and loads the DIB. Once the DIB
408 * is loaded, the function also creates a bitmap and
409 * palette out of the DIB for a device-dependent form.
410 *
411 * RETURNS : TRUE - DIB loaded and bitmap/palette created
412 * The DIBINIT structure pointed to by pInfo is
413 * filled with the appropriate handles.
414 * FALSE - otherwise
415 *
416 ****************************************************************************/
417 BOOL wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette)
418 {
419 int fh;
420 LPBITMAPINFOHEADER lpbi;
421 OFSTRUCT of;
422 BITMAPFILEHEADER bf;
423 WORD nNumColors;
424 BOOL result = FALSE;
425 WORD offBits;
426 HDC hDC;
427 BOOL bCoreHead = FALSE;
428 HANDLE hDIB = 0;
429
430 /* Open the file and get a handle to it's BITMAPINFO */
431
432 fh = OpenFile (wxConvertWX2MB(lpFileName), &of, OF_READ);
433 if (fh == -1) {
434 wxLogError(_("Can't open file '%s'"), lpFileName);
435 return (0);
436 }
437
438 hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
439 256 * sizeof(RGBQUAD)));
440 if (!hDIB)
441 return(0);
442
443 #ifdef __WINDOWS_386__
444 lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
445 #else
446 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
447 #endif
448
449 /* read the BITMAPFILEHEADER */
450 if (sizeof (bf) != _lread (fh, (LPSTR)&bf, sizeof (bf)))
451 goto ErrExit;
452
453 if (bf.bfType != 0x4d42) /* 'BM' */
454 goto ErrExit;
455
456 if (sizeof(BITMAPCOREHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPCOREHEADER)))
457 goto ErrExit;
458
459 if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
460 {
461 lpbi->biSize = sizeof(BITMAPINFOHEADER);
462 lpbi->biBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
463 lpbi->biPlanes = ((LPBITMAPCOREHEADER)lpbi)->bcPlanes;
464 lpbi->biHeight = ((LPBITMAPCOREHEADER)lpbi)->bcHeight;
465 lpbi->biWidth = ((LPBITMAPCOREHEADER)lpbi)->bcWidth;
466 bCoreHead = TRUE;
467 }
468 else
469 {
470 // get to the start of the header and read INFOHEADER
471 _llseek(fh,sizeof(BITMAPFILEHEADER),SEEK_SET);
472 if (sizeof(BITMAPINFOHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
473 goto ErrExit;
474 }
475
476 nNumColors = (WORD)lpbi->biClrUsed;
477 if ( nNumColors == 0 )
478 {
479 /* no color table for 24-bit, default size otherwise */
480 if (lpbi->biBitCount != 24)
481 nNumColors = 1 << lpbi->biBitCount; /* standard size table */
482 }
483
484 /* fill in some default values if they are zero */
485 if (lpbi->biClrUsed == 0)
486 lpbi->biClrUsed = nNumColors;
487
488 if (lpbi->biSizeImage == 0)
489 {
490 lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
491 * lpbi->biHeight;
492 }
493
494 /* get a proper-sized buffer for header, color table and bits */
495 GlobalUnlock(hDIB);
496 hDIB = GlobalReAlloc(hDIB, lpbi->biSize +
497 nNumColors * sizeof(RGBQUAD) +
498 lpbi->biSizeImage, 0);
499 if (!hDIB) /* can't resize buffer for loading */
500 goto ErrExit2;
501
502 #ifdef __WINDOWS_386__
503 lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
504 #else
505 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
506 #endif
507
508 /* read the color table */
509 if (!bCoreHead)
510 _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
511 else
512 {
513 signed int i;
514 RGBQUAD FAR *pQuad;
515 RGBTRIPLE FAR *pTriple;
516
517 _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBTRIPLE));
518
519 pQuad = (RGBQUAD FAR *)((LPSTR)lpbi + lpbi->biSize);
520 pTriple = (RGBTRIPLE FAR *) pQuad;
521 for (i = nNumColors - 1; i >= 0; i--)
522 {
523 pQuad[i].rgbRed = pTriple[i].rgbtRed;
524 pQuad[i].rgbBlue = pTriple[i].rgbtBlue;
525 pQuad[i].rgbGreen = pTriple[i].rgbtGreen;
526 pQuad[i].rgbReserved = 0;
527 }
528 }
529
530 /* offset to the bits from start of DIB header */
531 offBits = (WORD)(lpbi->biSize + nNumColors * sizeof(RGBQUAD));
532
533 if (bf.bfOffBits != 0L)
534 {
535 _llseek(fh,bf.bfOffBits,SEEK_SET);
536 }
537
538 if (lpbi->biSizeImage == lread(fh, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
539 {
540 GlobalUnlock(hDIB);
541
542 hDC = GetDC(NULL);
543 if (!MakeBitmapAndPalette(hDC, hDIB, palette,
544 bitmap))
545 {
546 ReleaseDC(NULL,hDC);
547 goto ErrExit2;
548 }
549 else
550 {
551 ReleaseDC(NULL,hDC);
552 GlobalFree(hDIB);
553 result = TRUE;
554 }
555 }
556 else
557 {
558 ErrExit:
559 GlobalUnlock(hDIB);
560 ErrExit2:
561 GlobalFree(hDIB);
562 }
563
564 _lclose(fh);
565 return(result);
566 }
567
568 /****************************************************************************
569 *
570 * FUNCTION : MakeBitmapAndPalette
571 *
572 * PURPOSE : Given a DIB, creates a bitmap and corresponding palette
573 * to be used for a device-dependent representation of
574 * of the image.
575 *
576 * RETURNS : TRUE --> success. phPal and phBitmap are filled with
577 * appropriate handles. Caller is responsible
578 * for freeing objects.
579 * FALSE --> unable to create objects. both pointer are
580 * not valid
581 *
582 ****************************************************************************/
583 static BOOL PASCAL MakeBitmapAndPalette(HDC hDC, HANDLE hDIB,
584 HPALETTE * phPal, HBITMAP * phBitmap)
585 {
586 LPBITMAPINFOHEADER lpInfo;
587 BOOL result = FALSE;
588 HBITMAP hBitmap;
589 HPALETTE hPalette, hOldPal;
590 LPSTR lpBits;
591
592 #ifdef __WINDOWS_386__
593 lpInfo = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hDIB));
594 #else
595 lpInfo = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
596 #endif
597
598 hPalette = wxMakeDIBPalette(lpInfo);
599 if ( hPalette )
600 {
601 // Need to realize palette for converting DIB to bitmap.
602 hOldPal = SelectPalette(hDC, hPalette, TRUE);
603 RealizePalette(hDC);
604
605 lpBits = (LPSTR)lpInfo + (WORD)lpInfo->biSize +
606 (WORD)lpInfo->biClrUsed * sizeof(RGBQUAD);
607 hBitmap = CreateDIBitmap(hDC, lpInfo, CBM_INIT, lpBits,
608 (LPBITMAPINFO)lpInfo, DIB_RGB_COLORS);
609
610 SelectPalette(hDC, hOldPal, TRUE);
611 RealizePalette(hDC);
612
613 if (!hBitmap)
614 DeleteObject(hPalette);
615 else
616 {
617 *phBitmap = hBitmap;
618 *phPal = hPalette;
619 result = TRUE;
620 }
621 }
622
623 GlobalUnlock (hDIB); // glt
624
625 return(result);
626 }
627
628 /****************************************************************************
629 * *
630 * FUNCTION : wxMakeDIBPalette(lpInfo) *
631 * *
632 * PURPOSE : Given a BITMAPINFOHEADER, create a palette based on
633 * the color table.
634 *
635 * *
636 * RETURNS : non-zero - handle of a corresponding palette
637 * zero - unable to create palette
638 * *
639 ****************************************************************************/
640 HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo)
641 {
642 LPLOGPALETTE npPal;
643 RGBQUAD far *lpRGB;
644 HPALETTE hLogPal;
645 WORD i;
646
647 /* since biClrUsed field was filled during the loading of the DIB,
648 ** we know it contains the number of colors in the color table.
649 */
650 if (lpInfo->biClrUsed)
651 {
652 /*
653 npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +
654 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
655 */
656 npPal = (LPLOGPALETTE)malloc(sizeof(LOGPALETTE) +
657 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
658 if (!npPal)
659 return NULL;
660
661 npPal->palVersion = 0x300;
662 npPal->palNumEntries = (WORD)lpInfo->biClrUsed;
663
664 /* get pointer to the color table */
665 lpRGB = (RGBQUAD FAR *)((LPSTR)lpInfo + lpInfo->biSize);
666
667 /* copy colors from the color table to the LogPalette structure */
668 for (i = 0; (DWORD)i < lpInfo->biClrUsed; i++, lpRGB++)
669 {
670 npPal->palPalEntry[i].peRed = lpRGB->rgbRed;
671 npPal->palPalEntry[i].peGreen = lpRGB->rgbGreen;
672 npPal->palPalEntry[i].peBlue = lpRGB->rgbBlue;
673 npPal->palPalEntry[i].peFlags = 0;
674 }
675
676 hLogPal = CreatePalette((LPLOGPALETTE)npPal);
677 // LocalFree((HANDLE)npPal);
678 free(npPal);
679
680 return(hLogPal);
681 }
682
683 /* 24-bit DIB with no color table. return default palette. Another
684 ** option would be to create a 256 color "rainbow" palette to provide
685 ** some good color choices.
686 */
687 else
688 return((HPALETTE) GetStockObject(DEFAULT_PALETTE));
689 }
690
691 bool wxLoadIntoBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette **pal)
692 {
693 HBITMAP hBitmap = NULL;
694 HPALETTE hPalette = NULL;
695
696 bool success = (wxReadDIB(filename, &hBitmap, &hPalette) != 0);
697
698 if (!success)
699 {
700 if (hPalette)
701 DeleteObject(hPalette);
702 return FALSE;
703 }
704
705 if (hPalette)
706 {
707 #if wxUSE_PALETTE
708 if (pal)
709 {
710 *pal = new wxPalette;
711 (*pal)->SetHPALETTE((WXHPALETTE) hPalette);
712 }
713 else
714 #endif // wxUSE_PALETTE
715 DeleteObject(hPalette);
716 }
717 else if (pal)
718 *pal = NULL;
719
720 if (hBitmap)
721 {
722 BITMAP bm;
723 GetObject(hBitmap, sizeof(bm), (LPSTR)&bm);
724
725 bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
726 bitmap->SetWidth(bm.bmWidth);
727 bitmap->SetHeight(bm.bmHeight);
728 bitmap->SetDepth(bm.bmPlanes * bm.bmBitsPixel);
729 #if WXWIN_COMPATIBILITY_2
730 bitmap->SetOk(TRUE);
731 #endif // WXWIN_COMPATIBILITY_2
732 return TRUE;
733 }
734 else return FALSE;
735 }
736
737 wxBitmap *wxLoadBitmap(wxChar *filename, wxPalette **pal)
738 {
739 wxBitmap *bitmap = new wxBitmap;
740 if (wxLoadIntoBitmap(filename, bitmap, pal))
741 return bitmap;
742 else
743 {
744 delete bitmap;
745 return NULL;
746 }
747 }
748
749 //---------------------------------------------------------------------
750 //
751 // Function: InitBitmapInfoHeader
752 //
753 // Purpose: Does a "standard" initialization of a BITMAPINFOHEADER,
754 // given the Width, Height, and Bits per Pixel for the
755 // DIB.
756 //
757 // By standard, I mean that all the relevant fields are set
758 // to the specified values. biSizeImage is computed, the
759 // biCompression field is set to "no compression," and all
760 // other fields are 0.
761 //
762 // Note that DIBs only allow BitsPixel values of 1, 4, 8, or
763 // 24. This routine makes sure that one of these values is
764 // used (whichever is most appropriate for the specified
765 // nBPP).
766 //
767 // Parms: lpBmInfoHdr == Far pointer to a BITMAPINFOHEADER structure
768 // to be filled in.
769 // dwWidth == Width of DIB (not in Win 3.0 & 3.1, high
770 // word MUST be 0).
771 // dwHeight == Height of DIB (not in Win 3.0 & 3.1, high
772 // word MUST be 0).
773 // nBPP == Bits per Pixel for the DIB.
774 //
775 // History: Date Reason
776 // 11/07/91 Created
777 //
778 //---------------------------------------------------------------------
779
780 static void InitBitmapInfoHeader (LPBITMAPINFOHEADER lpBmInfoHdr,
781 DWORD dwWidth,
782 DWORD dwHeight,
783 int nBPP)
784 {
785 // _fmemset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
786 memset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
787
788 lpBmInfoHdr->biSize = sizeof (BITMAPINFOHEADER);
789 lpBmInfoHdr->biWidth = dwWidth;
790 lpBmInfoHdr->biHeight = dwHeight;
791 lpBmInfoHdr->biPlanes = 1;
792
793 if (nBPP <= 1)
794 nBPP = 1;
795 else if (nBPP <= 4)
796 nBPP = 4;
797 else if (nBPP <= 8)
798 nBPP = 8;
799 /* Doesn't work
800 else if (nBPP <= 16)
801 nBPP = 16;
802 */
803 else
804 nBPP = 24;
805
806 lpBmInfoHdr->biBitCount = nBPP;
807 lpBmInfoHdr->biSizeImage = WIDTHBYTES (dwWidth * nBPP) * dwHeight;
808 }
809
810
811
812
813 LPSTR wxFindDIBBits (LPSTR lpbi)
814 {
815 return (lpbi + *(LPDWORD)lpbi + wxPaletteSize (lpbi));
816 }
817
818 //---------------------------------------------------------------------
819 //
820 // Function: BitmapToDIB
821 //
822 // Purpose: Given a device dependent bitmap and a palette, returns
823 // a handle to global memory with a DIB spec in it. The
824 // DIB is rendered using the colors of the palette passed in.
825 //
826 // Stolen almost verbatim from ShowDIB.
827 //
828 // Parms: hBitmap == Handle to device dependent bitmap compatible
829 // with default screen display device.
830 // hPal == Palette to render the DDB with. If it's NULL,
831 // use the default palette.
832 //
833 // History: Date Reason
834 // 6/01/91 Created
835 //
836 //---------------------------------------------------------------------
837
838 HANDLE wxBitmapToDIB (HBITMAP hBitmap, HPALETTE hPal)
839 {
840 BITMAP Bitmap;
841 BITMAPINFOHEADER bmInfoHdr;
842 LPBITMAPINFOHEADER lpbmInfoHdr;
843 LPSTR lpBits;
844 HDC hMemDC;
845 HANDLE hDIB;
846 HPALETTE hOldPal = NULL;
847
848 // Do some setup -- make sure the Bitmap passed in is valid,
849 // get info on the bitmap (like its height, width, etc.),
850 // then setup a BITMAPINFOHEADER.
851
852 if (!hBitmap)
853 return NULL;
854
855 if (!GetObject (hBitmap, sizeof (Bitmap), (LPSTR) &Bitmap))
856 return NULL;
857
858 InitBitmapInfoHeader (&bmInfoHdr,
859 Bitmap.bmWidth,
860 Bitmap.bmHeight,
861 Bitmap.bmPlanes * Bitmap.bmBitsPixel);
862
863
864 // Now allocate memory for the DIB. Then, set the BITMAPINFOHEADER
865 // into this memory, and find out where the bitmap bits go.
866
867 hDIB = GlobalAlloc (GHND, sizeof (BITMAPINFOHEADER) +
868 wxPaletteSize ((LPSTR) &bmInfoHdr) + bmInfoHdr.biSizeImage);
869
870 if (!hDIB)
871 return NULL;
872
873 #ifdef __WINDOWS_386__
874 lpbmInfoHdr = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock (hDIB));
875 #else
876 lpbmInfoHdr = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
877 #endif
878
879 *lpbmInfoHdr = bmInfoHdr;
880 lpBits = wxFindDIBBits ((LPSTR) lpbmInfoHdr);
881
882
883 // Now, we need a DC to hold our bitmap. If the app passed us
884 // a palette, it should be selected into the DC.
885
886 hMemDC = GetDC (NULL);
887
888 if (hPal)
889 {
890 hOldPal = SelectPalette (hMemDC, hPal, FALSE);
891 RealizePalette (hMemDC);
892 }
893
894
895
896 // We're finally ready to get the DIB. Call the driver and let
897 // it party on our bitmap. It will fill in the color table,
898 // and bitmap bits of our global memory block.
899
900 if (!GetDIBits (hMemDC,
901 hBitmap,
902 0,
903 Bitmap.bmHeight,
904 lpBits,
905 (LPBITMAPINFO) lpbmInfoHdr,
906 DIB_RGB_COLORS))
907 {
908 GlobalUnlock (hDIB);
909 GlobalFree (hDIB);
910 hDIB = NULL;
911 }
912 else
913 GlobalUnlock (hDIB);
914
915
916 // Finally, clean up and return.
917
918 if (hOldPal)
919 SelectPalette (hMemDC, hOldPal, FALSE);
920
921 ReleaseDC (NULL, hMemDC);
922
923 return hDIB;
924 }
925
926 bool wxSaveBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette *colourmap)
927 {
928 HPALETTE hPalette = 0;
929 #if wxUSE_PALETTE
930 if (colourmap)
931 hPalette = (HPALETTE) colourmap->GetHPALETTE();
932 #endif // wxUSE_PALETTE
933
934 HANDLE dibHandle = wxBitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
935 if (dibHandle)
936 {
937 bool success = (WriteDIB(filename, dibHandle) != 0);
938 GlobalFree(dibHandle);
939 return success;
940 }
941 else return FALSE;
942 }
943
wxWidgets (Impactor)