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1 /*******************************************************************************
2 * *
3 * MODULE : DIB.CC *
4 * *
5 * DESCRIPTION : Routines for dealing with Device Independent Bitmaps. *
6 * *
7 * FUNCTIONS : *
8 * *
9 * ReadDIB() - Reads a DIB *
10 * *
11 * WriteDIB() - Writes a global handle in CF_DIB format*
12 * to a file. *
13 * *
14 * PaletteSize() - 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/setup.h"
37 #include "wx/defs.h"
38 #include "wx/bitmap.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 #ifndef __TWIN32__
52 #ifdef __GNUWIN32__
53 #include "wx/msw/gnuwin32/extra.h"
54 #endif
55 #endif
56
57 #ifndef SEEK_CUR
58 /* flags for _lseek */
59 #define SEEK_CUR 1
60 #define SEEK_END 2
61 #define SEEK_SET 0
62 #endif
63
64 #define MAXREAD 32768 /* Number of bytes to be read during */
65 /* each read operation. */
66
67 /* Header signatutes for various resources */
68 #define BFT_ICON 0x4349 /* 'IC' */
69 #define BFT_BITMAP 0x4d42 /* 'BM' */
70 #define BFT_CURSOR 0x5450 /* 'PT' */
71
72 /* macro to determine if resource is a DIB */
73 #define ISDIB(bft) ((bft) == BFT_BITMAP)
74
75 /* Macro to align given value to the closest DWORD (unsigned long ) */
76 #define ALIGNULONG(i) ((i+3)/4*4)
77
78 /* Macro to determine to round off the given value to the closest byte */
79 #define WIDTHBYTES(i) ((i+31)/32*4)
80
81 #define PALVERSION 0x300
82 #define MAXPALETTE 256 /* max. # supported palette entries */
83
84 DWORD PASCAL lread(int fh, VOID FAR *pv, DWORD ul);
85 DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul);
86
87 BOOL WriteDIB (LPSTR szFile,HANDLE hdib);
88 WORD PaletteSize (VOID FAR * pv);
89 WORD DibNumColors (VOID FAR * pv);
90 // HANDLE DibFromBitmap (HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal);
91 BOOL PASCAL MakeBitmapAndPalette(HDC,HANDLE,HPALETTE *,HBITMAP *);
92 HPALETTE MakeDIBPalette(LPBITMAPINFOHEADER);
93 BOOL ReadDIB(LPSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette);
94
95 /****************************************************************************
96 * *
97 * FUNCTION : WriteDIB(LPSTR szFile,HANDLE hdib) *
98 * *
99 * PURPOSE : Write a global handle in CF_DIB format to a file. *
100 * *
101 * RETURNS : TRUE - if successful. *
102 * FALSE - otherwise *
103 * *
104 ****************************************************************************/
105
106 BOOL WriteDIB(LPSTR szFile, HANDLE hdib)
107 {
108 BITMAPFILEHEADER hdr;
109 LPBITMAPINFOHEADER lpbi;
110 int fh;
111 OFSTRUCT of;
112
113 if (!hdib)
114 return FALSE;
115
116 fh = OpenFile(szFile, &of, OF_CREATE | OF_READWRITE);
117 if (fh == -1)
118 return FALSE;
119
120 #ifdef __WINDOWS_386__
121 lpbi = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hdib));
122 #else
123 lpbi = (LPBITMAPINFOHEADER) GlobalLock(hdib);
124 #endif
125 /* Fill in the fields of the file header */
126 hdr.bfType = BFT_BITMAP;
127 hdr.bfSize = GlobalSize(hdib) + sizeof(BITMAPFILEHEADER);
128 hdr.bfReserved1 = 0;
129 hdr.bfReserved2 = 0;
130 hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + lpbi->biSize +
131 PaletteSize(lpbi);
132
133 /* Write the file header */
134 _lwrite(fh, (LPSTR) &hdr, sizeof(BITMAPFILEHEADER));
135
136 /* Write the DIB header and the bits */
137 lwrite(fh, (LPSTR) lpbi, GlobalSize(hdib));
138
139 GlobalUnlock(hdib);
140 _lclose(fh);
141 return TRUE;
142 }
143
144 /****************************************************************************
145 * *
146 * FUNCTION : PaletteSize(VOID FAR * pv) *
147 * *
148 * PURPOSE : Calculates the palette size in bytes. If the info. block *
149 * is of the BITMAPCOREHEADER type, the number of colors is *
150 * multiplied by 3 to give the palette size, otherwise the *
151 * number of colors is multiplied by 4. *
152 * *
153 * RETURNS : Palette size in number of bytes. *
154 * *
155 ****************************************************************************/
156
157 WORD PaletteSize(VOID FAR * pv)
158 {
159 LPBITMAPINFOHEADER lpbi;
160 WORD NumColors;
161
162 lpbi = (LPBITMAPINFOHEADER) pv;
163 NumColors = DibNumColors(lpbi);
164
165 if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
166 return NumColors * sizeof(RGBTRIPLE);
167 else
168 return NumColors * sizeof(RGBQUAD);
169 }
170
171 /****************************************************************************
172 * *
173 * FUNCTION : DibNumColors(VOID FAR * pv) *
174 * *
175 * PURPOSE : Determines the number of colors in the DIB by looking at *
176 * the BitCount filed in the info block. *
177 * *
178 * RETURNS : The number of colors in the DIB. *
179 * *
180 ****************************************************************************/
181
182 WORD DibNumColors(VOID FAR *pv)
183 {
184 int bits;
185 BITMAPINFOHEADER *lpbi;
186 BITMAPCOREHEADER *lpbc;
187
188 lpbi = ((BITMAPINFOHEADER*) pv);
189 lpbc = ((BITMAPCOREHEADER*) pv);
190
191 /* With the BITMAPINFO format headers, the size of the palette
192 * is in biClrUsed, whereas in the BITMAPCORE - style headers, it
193 * is dependent on the bits per pixel ( = 2 raised to the power of
194 * bits/pixel).
195 */
196 if (lpbi->biSize != sizeof(BITMAPCOREHEADER)) {
197 if (lpbi->biClrUsed != 0)
198 return (WORD) lpbi->biClrUsed;
199 bits = lpbi->biBitCount;
200 }
201 else
202 bits = lpbc->bcBitCount;
203
204 switch (bits) {
205 case 1:
206 return 2;
207 case 4:
208 return 16;
209 case 8:
210 return 256;
211 default:
212 /* A 24 bitcount DIB has no color table */
213 return 0;
214 }
215 }
216
217 /****************************************************************************
218 * *
219 * FUNCTION : DibFromBitmap() *
220 * *
221 * PURPOSE : Will create a global memory block in DIB format that *
222 * represents the Device-dependent bitmap (DDB) passed in. *
223 * *
224 * RETURNS : A handle to the DIB *
225 * *
226 ****************************************************************************/
227
228 #if NOTHING
229 HANDLE DibFromBitmap(HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal)
230 {
231 BITMAP bm;
232 BITMAPINFOHEADER bi;
233 BITMAPINFOHEADER FAR *lpbi;
234 DWORD dwLen;
235 HANDLE hdib;
236 HANDLE h;
237 HDC hdc;
238
239 if (!hbm)
240 return NULL;
241
242 if (hpal == NULL)
243 hpal = GetStockObject(DEFAULT_PALETTE);
244
245 GetObject(hbm, sizeof (bm), (LPSTR) &bm);
246
247 if (biBits == 0)
248 biBits = bm.bmPlanes * bm.bmBitsPixel;
249
250 bi.biSize = sizeof(BITMAPINFOHEADER);
251 bi.biWidth = bm.bmWidth;
252 bi.biHeight = bm.bmHeight;
253 bi.biPlanes = 1;
254 bi.biBitCount = biBits;
255 bi.biCompression = biStyle;
256 bi.biSizeImage = 0;
257 bi.biXPelsPerMeter = 0;
258 bi.biYPelsPerMeter = 0;
259 bi.biClrUsed = 0;
260 bi.biClrImportant = 0;
261
262 dwLen = bi.biSize + PaletteSize(&bi);
263
264 hdc = GetDC((HWND) NULL);
265 hpal = SelectPalette(hdc, hpal, FALSE);
266 RealizePalette(hdc);
267
268 hdib = GlobalAlloc(GHND, dwLen);
269
270 if (!hdib) {
271 SelectPalette(hdc, hpal, FALSE);
272 ReleaseDC(NULL, hdc);
273 return NULL;
274 }
275
276 #ifdef __WINDOWS_386__
277 lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
278 #else
279 lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
280 #endif
281
282 *lpbi = bi;
283
284 /* call GetDIBits with a NULL lpBits param, so it will calculate the
285 * biSizeImage field for us
286 */
287 GetDIBits(hdc, hbm, 0, (WORD) bi.biHeight,
288 NULL, (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);
289
290 bi = *lpbi;
291 GlobalUnlock(hdib);
292
293 /* If the driver did not fill in the biSizeImage field, make one up */
294 if (bi.biSizeImage == 0) {
295 bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
296
297 if (biStyle != BI_RGB)
298 bi.biSizeImage = (bi.biSizeImage * 3) / 2;
299 }
300
301 /* realloc the buffer big enough to hold all the bits */
302 dwLen = bi.biSize + PaletteSize(&bi) + bi.biSizeImage;
303 if (h = GlobalReAlloc(hdib, dwLen, 0))
304 hdib = h;
305 else {
306 GlobalFree(hdib);
307 hdib = NULL;
308
309 SelectPalette(hdc, hpal, FALSE);
310 ReleaseDC(NULL, hdc);
311 return hdib;
312 }
313
314 /* call GetDIBits with a NON-NULL lpBits param, and actualy get the
315 * bits this time
316 */
317 #ifdef __WINDOWS_386__
318 lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
319 #else
320 lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
321 #endif
322
323 if (GetDIBits(hdc,
324 hbm,
325 0,
326 (WORD) bi.biHeight,
327 (LPSTR) lpbi + (WORD) lpbi->biSize + PaletteSize(lpbi),
328 (LPBITMAPINFO) lpbi, DIB_RGB_COLORS) == 0) {
329 GlobalUnlock(hdib);
330 hdib = NULL;
331 SelectPalette(hdc, hpal, FALSE);
332 ReleaseDC((HWND) NULL, hdc);
333 return NULL;
334 }
335
336 bi = *lpbi;
337 GlobalUnlock(hdib);
338
339 SelectPalette(hdc, hpal, FALSE);
340 ReleaseDC(NULL, hdc);
341 return hdib;
342 }
343 #endif
344
345 /************* PRIVATE ROUTINES TO READ/WRITE MORE THAN 64K ***************/
346 /****************************************************************************
347 * *
348 * FUNCTION : lread(int fh, VOID FAR *pv, DWORD ul) *
349 * *
350 * PURPOSE : Reads data in steps of 32k till all the data has been read.*
351 * *
352 * RETURNS : 0 - If read did not proceed correctly. *
353 * number of bytes read otherwise. *
354 * *
355 ****************************************************************************/
356
357 DWORD PASCAL lread(int fh, void far *pv, DWORD ul)
358 {
359 DWORD ulT = ul;
360 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
361 BYTE *hp = (BYTE *) pv;
362 #else
363 BYTE huge *hp = (BYTE huge *) pv;
364 #endif
365 while (ul > (DWORD) MAXREAD) {
366 if (_lread(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
367 return 0;
368 ul -= MAXREAD;
369 hp += MAXREAD;
370 }
371 if (_lread(fh, (LPSTR) hp, (WORD) ul) != (WORD) ul)
372 return 0;
373 return ulT;
374 }
375
376 /****************************************************************************
377 * *
378 * FUNCTION : lwrite(int fh, VOID FAR *pv, DWORD ul) *
379 * *
380 * PURPOSE : Writes data in steps of 32k till all the data is written. *
381 * *
382 * RETURNS : 0 - If write did not proceed correctly. *
383 * number of bytes written otherwise. *
384 * *
385 ****************************************************************************/
386
387 DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul)
388 {
389 DWORD ulT = ul;
390 #if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
391 BYTE *hp = (BYTE *) pv;
392 #else
393 BYTE huge *hp = (BYTE huge *) pv;
394 #endif
395 while (ul > MAXREAD) {
396 if (_lwrite(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
397 return 0;
398 ul -= MAXREAD;
399 hp += MAXREAD;
400 }
401 if (_lwrite(fh, (LPSTR) hp, (WORD) ul) != (WORD) ul)
402 return 0;
403 return ulT;
404 }
405
406 /****************************************************************************
407 *
408 * FUNCTION : ReadDIB(hWnd)
409 *
410 * PURPOSE : Reads a DIB from a file, obtains a handle to its
411 * BITMAPINFO struct. and loads the DIB. Once the DIB
412 * is loaded, the function also creates a bitmap and
413 * palette out of the DIB for a device-dependent form.
414 *
415 * RETURNS : TRUE - DIB loaded and bitmap/palette created
416 * The DIBINIT structure pointed to by pInfo is
417 * filled with the appropriate handles.
418 * FALSE - otherwise
419 *
420 ****************************************************************************/
421 BOOL ReadDIB(LPSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette)
422 {
423 int fh;
424 LPBITMAPINFOHEADER lpbi;
425 OFSTRUCT of;
426 BITMAPFILEHEADER bf;
427 WORD nNumColors;
428 BOOL result = FALSE;
429 char str[128];
430 WORD offBits;
431 HDC hDC;
432 BOOL bCoreHead = FALSE;
433 HANDLE hDIB = 0;
434
435 /* Open the file and get a handle to it's BITMAPINFO */
436
437 fh = OpenFile (lpFileName, &of, OF_READ);
438 if (fh == -1) {
439 wsprintf(str,"Can't open file '%ls'", (LPSTR)lpFileName);
440 MessageBox(NULL, str, "Error", MB_ICONSTOP | MB_OK);
441 return (0);
442 }
443
444 hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
445 256 * sizeof(RGBQUAD)));
446 if (!hDIB)
447 return(0);
448
449 #ifdef __WINDOWS_386__
450 lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
451 #else
452 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
453 #endif
454
455 /* read the BITMAPFILEHEADER */
456 if (sizeof (bf) != _lread (fh, (LPSTR)&bf, sizeof (bf)))
457 goto ErrExit;
458
459 if (bf.bfType != 0x4d42) /* 'BM' */
460 goto ErrExit;
461
462 if (sizeof(BITMAPCOREHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPCOREHEADER)))
463 goto ErrExit;
464
465 if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
466 {
467 lpbi->biSize = sizeof(BITMAPINFOHEADER);
468 lpbi->biBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
469 lpbi->biPlanes = ((LPBITMAPCOREHEADER)lpbi)->bcPlanes;
470 lpbi->biHeight = ((LPBITMAPCOREHEADER)lpbi)->bcHeight;
471 lpbi->biWidth = ((LPBITMAPCOREHEADER)lpbi)->bcWidth;
472 bCoreHead = TRUE;
473 }
474 else
475 {
476 // get to the start of the header and read INFOHEADER
477 _llseek(fh,sizeof(BITMAPFILEHEADER),SEEK_SET);
478 if (sizeof(BITMAPINFOHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
479 goto ErrExit;
480 }
481
482 nNumColors = (WORD)lpbi->biClrUsed;
483 if ( nNumColors == 0 )
484 {
485 /* no color table for 24-bit, default size otherwise */
486 if (lpbi->biBitCount != 24)
487 nNumColors = 1 << lpbi->biBitCount; /* standard size table */
488 }
489
490 /* fill in some default values if they are zero */
491 if (lpbi->biClrUsed == 0)
492 lpbi->biClrUsed = nNumColors;
493
494 if (lpbi->biSizeImage == 0)
495 {
496 lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
497 * lpbi->biHeight;
498 }
499
500 /* get a proper-sized buffer for header, color table and bits */
501 GlobalUnlock(hDIB);
502 hDIB = GlobalReAlloc(hDIB, lpbi->biSize +
503 nNumColors * sizeof(RGBQUAD) +
504 lpbi->biSizeImage, 0);
505 if (!hDIB) /* can't resize buffer for loading */
506 goto ErrExit2;
507
508 #ifdef __WINDOWS_386__
509 lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
510 #else
511 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
512 #endif
513
514 /* read the color table */
515 if (!bCoreHead)
516 _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
517 else
518 {
519 signed int i;
520 RGBQUAD FAR *pQuad;
521 RGBTRIPLE FAR *pTriple;
522
523 _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBTRIPLE));
524
525 pQuad = (RGBQUAD FAR *)((LPSTR)lpbi + lpbi->biSize);
526 pTriple = (RGBTRIPLE FAR *) pQuad;
527 for (i = nNumColors - 1; i >= 0; i--)
528 {
529 pQuad[i].rgbRed = pTriple[i].rgbtRed;
530 pQuad[i].rgbBlue = pTriple[i].rgbtBlue;
531 pQuad[i].rgbGreen = pTriple[i].rgbtGreen;
532 pQuad[i].rgbReserved = 0;
533 }
534 }
535
536 /* offset to the bits from start of DIB header */
537 offBits = (WORD)lpbi->biSize + nNumColors * sizeof(RGBQUAD);
538
539 if (bf.bfOffBits != 0L)
540 {
541 _llseek(fh,bf.bfOffBits,SEEK_SET);
542 }
543
544 if (lpbi->biSizeImage == lread(fh, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
545 {
546 GlobalUnlock(hDIB);
547
548 hDC = GetDC(NULL);
549 if (!MakeBitmapAndPalette(hDC, hDIB, palette,
550 bitmap))
551 {
552 ReleaseDC(NULL,hDC);
553 goto ErrExit2;
554 }
555 else
556 {
557 ReleaseDC(NULL,hDC);
558 GlobalFree(hDIB);
559 result = TRUE;
560 }
561 }
562 else
563 {
564 ErrExit:
565 GlobalUnlock(hDIB);
566 ErrExit2:
567 GlobalFree(hDIB);
568 }
569
570 _lclose(fh);
571 return(result);
572 }
573
574 /****************************************************************************
575 *
576 * FUNCTION : MakeBitmapAndPalette
577 *
578 * PURPOSE : Given a DIB, creates a bitmap and corresponding palette
579 * to be used for a device-dependent representation of
580 * of the image.
581 *
582 * RETURNS : TRUE --> success. phPal and phBitmap are filled with
583 * appropriate handles. Caller is responsible
584 * for freeing objects.
585 * FALSE --> unable to create objects. both pointer are
586 * not valid
587 *
588 ****************************************************************************/
589 BOOL PASCAL MakeBitmapAndPalette(HDC hDC, HANDLE hDIB,
590 HPALETTE * phPal, HBITMAP * phBitmap)
591 {
592 LPBITMAPINFOHEADER lpInfo;
593 BOOL result = FALSE;
594 HBITMAP hBitmap;
595 HPALETTE hPalette, hOldPal;
596 LPSTR lpBits;
597
598 #ifdef __WINDOWS_386__
599 lpInfo = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hDIB));
600 #else
601 lpInfo = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
602 #endif
603
604 hPalette = MakeDIBPalette(lpInfo);
605 if ( hPalette )
606 {
607 // Need to realize palette for converting DIB to bitmap.
608 hOldPal = SelectPalette(hDC, hPalette, TRUE);
609 RealizePalette(hDC);
610
611 lpBits = (LPSTR)lpInfo + (WORD)lpInfo->biSize +
612 (WORD)lpInfo->biClrUsed * sizeof(RGBQUAD);
613 hBitmap = CreateDIBitmap(hDC, lpInfo, CBM_INIT, lpBits,
614 (LPBITMAPINFO)lpInfo, DIB_RGB_COLORS);
615
616 SelectPalette(hDC, hOldPal, TRUE);
617 RealizePalette(hDC);
618
619 if (!hBitmap)
620 DeleteObject(hPalette);
621 else
622 {
623 *phBitmap = hBitmap;
624 *phPal = hPalette;
625 result = TRUE;
626 }
627 }
628 return(result);
629 }
630
631 /****************************************************************************
632 * *
633 * FUNCTION : MakeDIBPalette(lpInfo) *
634 * *
635 * PURPOSE : Given a BITMAPINFOHEADER, create a palette based on
636 * the color table.
637 *
638 * *
639 * RETURNS : non-zero - handle of a corresponding palette
640 * zero - unable to create palette
641 * *
642 ****************************************************************************/
643 HPALETTE MakeDIBPalette(LPBITMAPINFOHEADER lpInfo)
644 {
645 NPLOGPALETTE npPal;
646 RGBQUAD far *lpRGB;
647 HPALETTE hLogPal;
648 WORD i;
649
650 /* since biClrUsed field was filled during the loading of the DIB,
651 ** we know it contains the number of colors in the color table.
652 */
653 if (lpInfo->biClrUsed)
654 {
655 /*
656 npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +
657 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
658 */
659 npPal = (NPLOGPALETTE)malloc(sizeof(LOGPALETTE) +
660 (WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
661
662 if (!npPal)
663 return(FALSE);
664
665 npPal->palVersion = 0x300;
666 npPal->palNumEntries = (WORD)lpInfo->biClrUsed;
667
668 /* get pointer to the color table */
669 lpRGB = (RGBQUAD FAR *)((LPSTR)lpInfo + lpInfo->biSize);
670
671 /* copy colors from the color table to the LogPalette structure */
672 for (i = 0; i < lpInfo->biClrUsed; i++, lpRGB++)
673 {
674 npPal->palPalEntry[i].peRed = lpRGB->rgbRed;
675 npPal->palPalEntry[i].peGreen = lpRGB->rgbGreen;
676 npPal->palPalEntry[i].peBlue = lpRGB->rgbBlue;
677 npPal->palPalEntry[i].peFlags = 0;
678 }
679
680 hLogPal = CreatePalette((LPLOGPALETTE)npPal);
681 // LocalFree((HANDLE)npPal);
682 free(npPal);
683
684 return(hLogPal);
685 }
686
687 /* 24-bit DIB with no color table. return default palette. Another
688 ** option would be to create a 256 color "rainbow" palette to provide
689 ** some good color choices.
690 */
691 else
692 return((HPALETTE) GetStockObject(DEFAULT_PALETTE));
693 }
694
695 bool wxLoadIntoBitmap(char *filename, wxBitmap *bitmap, wxPalette **pal)
696 {
697 HBITMAP hBitmap;
698 HPALETTE hPalette;
699
700 bool success = (ReadDIB(filename, &hBitmap, &hPalette) != 0);
701
702 if (!success)
703 {
704 DeleteObject(hPalette);
705 return FALSE;
706 }
707
708 if (hPalette)
709 {
710 if (pal)
711 {
712 *pal = new wxPalette;
713 (*pal)->SetHPALETTE((WXHPALETTE) hPalette);
714 }
715 else
716 DeleteObject(hPalette);
717 }
718 else if (pal)
719 *pal = NULL;
720
721 if (hBitmap)
722 {
723 BITMAP bm;
724 GetObject(hBitmap, sizeof(bm), (LPSTR)&bm);
725
726 bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
727 bitmap->SetWidth(bm.bmWidth);
728 bitmap->SetHeight(bm.bmHeight);
729 bitmap->SetDepth(bm.bmPlanes * bm.bmBitsPixel);
730 bitmap->SetOk(TRUE);
731 return TRUE;
732 }
733 else return FALSE;
734 }
735
736 wxBitmap *wxLoadBitmap(char *filename, wxPalette **pal)
737 {
738 wxBitmap *bitmap = new wxBitmap;
739 if (wxLoadIntoBitmap(filename, bitmap, pal))
740 return bitmap;
741 else
742 {
743 delete bitmap;
744 return NULL;
745 }
746 }
747
748 //---------------------------------------------------------------------
749 //
750 // Function: InitBitmapInfoHeader
751 //
752 // Purpose: Does a "standard" initialization of a BITMAPINFOHEADER,
753 // given the Width, Height, and Bits per Pixel for the
754 // DIB.
755 //
756 // By standard, I mean that all the relevant fields are set
757 // to the specified values. biSizeImage is computed, the
758 // biCompression field is set to "no compression," and all
759 // other fields are 0.
760 //
761 // Note that DIBs only allow BitsPixel values of 1, 4, 8, or
762 // 24. This routine makes sure that one of these values is
763 // used (whichever is most appropriate for the specified
764 // nBPP).
765 //
766 // Parms: lpBmInfoHdr == Far pointer to a BITMAPINFOHEADER structure
767 // to be filled in.
768 // dwWidth == Width of DIB (not in Win 3.0 & 3.1, high
769 // word MUST be 0).
770 // dwHeight == Height of DIB (not in Win 3.0 & 3.1, high
771 // word MUST be 0).
772 // nBPP == Bits per Pixel for the DIB.
773 //
774 // History: Date Reason
775 // 11/07/91 Created
776 //
777 //---------------------------------------------------------------------
778
779 void InitBitmapInfoHeader (LPBITMAPINFOHEADER lpBmInfoHdr,
780 DWORD dwWidth,
781 DWORD dwHeight,
782 int nBPP)
783 {
784 // _fmemset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
785 memset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
786
787 lpBmInfoHdr->biSize = sizeof (BITMAPINFOHEADER);
788 lpBmInfoHdr->biWidth = dwWidth;
789 lpBmInfoHdr->biHeight = dwHeight;
790 lpBmInfoHdr->biPlanes = 1;
791
792 if (nBPP <= 1)
793 nBPP = 1;
794 else if (nBPP <= 4)
795 nBPP = 4;
796 else if (nBPP <= 8)
797 nBPP = 8;
798 /* Doesn't work
799 else if (nBPP <= 16)
800 nBPP = 16;
801 */
802 else
803 nBPP = 24;
804
805 lpBmInfoHdr->biBitCount = nBPP;
806 lpBmInfoHdr->biSizeImage = WIDTHBYTES (dwWidth * nBPP) * dwHeight;
807 }
808
809
810
811
812 LPSTR FindDIBBits (LPSTR lpbi)
813 {
814 return (lpbi + *(LPDWORD)lpbi + PaletteSize (lpbi));
815 }
816
817 //---------------------------------------------------------------------
818 //
819 // Function: BitmapToDIB
820 //
821 // Purpose: Given a device dependent bitmap and a palette, returns
822 // a handle to global memory with a DIB spec in it. The
823 // DIB is rendered using the colors of the palette passed in.
824 //
825 // Stolen almost verbatim from ShowDIB.
826 //
827 // Parms: hBitmap == Handle to device dependent bitmap compatible
828 // with default screen display device.
829 // hPal == Palette to render the DDB with. If it's NULL,
830 // use the default palette.
831 //
832 // History: Date Reason
833 // 6/01/91 Created
834 //
835 //---------------------------------------------------------------------
836
837 HANDLE BitmapToDIB (HBITMAP hBitmap, HPALETTE hPal)
838 {
839 BITMAP Bitmap;
840 BITMAPINFOHEADER bmInfoHdr;
841 LPBITMAPINFOHEADER lpbmInfoHdr;
842 LPSTR lpBits;
843 HDC hMemDC;
844 HANDLE hDIB;
845 HPALETTE hOldPal = NULL;
846
847 // Do some setup -- make sure the Bitmap passed in is valid,
848 // get info on the bitmap (like its height, width, etc.),
849 // then setup a BITMAPINFOHEADER.
850
851 if (!hBitmap)
852 return NULL;
853
854 if (!GetObject (hBitmap, sizeof (Bitmap), (LPSTR) &Bitmap))
855 return NULL;
856
857 InitBitmapInfoHeader (&bmInfoHdr,
858 Bitmap.bmWidth,
859 Bitmap.bmHeight,
860 Bitmap.bmPlanes * Bitmap.bmBitsPixel);
861
862
863 // Now allocate memory for the DIB. Then, set the BITMAPINFOHEADER
864 // into this memory, and find out where the bitmap bits go.
865
866 hDIB = GlobalAlloc (GHND, sizeof (BITMAPINFOHEADER) +
867 PaletteSize ((LPSTR) &bmInfoHdr) + bmInfoHdr.biSizeImage);
868
869 if (!hDIB)
870 return NULL;
871
872 #ifdef __WINDOWS_386__
873 lpbmInfoHdr = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock (hDIB));
874 #else
875 lpbmInfoHdr = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
876 #endif
877
878 *lpbmInfoHdr = bmInfoHdr;
879 lpBits = FindDIBBits ((LPSTR) lpbmInfoHdr);
880
881
882 // Now, we need a DC to hold our bitmap. If the app passed us
883 // a palette, it should be selected into the DC.
884
885 hMemDC = GetDC (NULL);
886
887 if (hPal)
888 {
889 hOldPal = SelectPalette (hMemDC, hPal, FALSE);
890 RealizePalette (hMemDC);
891 }
892
893
894
895 // We're finally ready to get the DIB. Call the driver and let
896 // it party on our bitmap. It will fill in the color table,
897 // and bitmap bits of our global memory block.
898
899 if (!GetDIBits (hMemDC,
900 hBitmap,
901 0,
902 Bitmap.bmHeight,
903 lpBits,
904 (LPBITMAPINFO) lpbmInfoHdr,
905 DIB_RGB_COLORS))
906 {
907 GlobalUnlock (hDIB);
908 GlobalFree (hDIB);
909 hDIB = NULL;
910 }
911 else
912 GlobalUnlock (hDIB);
913
914
915 // Finally, clean up and return.
916
917 if (hOldPal)
918 SelectPalette (hMemDC, hOldPal, FALSE);
919
920 ReleaseDC (NULL, hMemDC);
921
922 return hDIB;
923 }
924
925 bool wxSaveBitmap(char *filename, wxBitmap *bitmap, wxPalette *colourmap)
926 {
927 HPALETTE hPalette = 0;
928 if (colourmap)
929 hPalette = (HPALETTE) colourmap->GetHPALETTE();
930
931 HANDLE dibHandle = BitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
932 if (dibHandle)
933 {
934 bool success = (WriteDIB(filename, dibHandle) != 0);
935 GlobalFree(dibHandle);
936 return success;
937 }
938 else return FALSE;
939 }
940
941
wxWidgets (Impactor)