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[wine/multimedia.git] / dlls / gdi / dib.c
blobb408118bde8925ef1166ff5d5a916b85591e1c2d
1 /*
2 * GDI device-independent bitmaps
3 *
4 * Copyright 1993,1994 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 Important information:
23
24 * Current Windows versions support two different DIB structures:
25
26 - BITMAPCOREINFO / BITMAPCOREHEADER (legacy structures; used in OS/2)
27 - BITMAPINFO / BITMAPINFOHEADER
28
29 Most Windows API functions taking a BITMAPINFO* / BITMAPINFOHEADER* also
30 accept the old "core" structures, and so must WINE.
31 You can distinguish them by looking at the first member (bcSize/biSize),
32 or use the internal function DIB_GetBitmapInfo.
33
34
35 * The palettes are stored in different formats:
36
37 - BITMAPCOREINFO: Array of RGBTRIPLE
38 - BITMAPINFO: Array of RGBQUAD
39
40
41 * There are even more DIB headers, but they all extend BITMAPINFOHEADER:
42
43 - BITMAPV4HEADER: Introduced in Windows 95 / NT 4.0
44 - BITMAPV5HEADER: Introduced in Windows 98 / 2000
45
46 If biCompression is BI_BITFIELDS, the color masks are at the same position
47 in all the headers (they start at bmiColors of BITMAPINFOHEADER), because
48 the new headers have structure members for the masks.
49
50
51 * You should never access the color table using the bmiColors member,
52 because the passed structure may have one of the extended headers
53 mentioned above. Use this to calculate the location:
54
55 BITMAPINFO* info;
56 void* colorPtr = (LPBYTE) info + (WORD) info->bmiHeader.biSize;
57
58
59 * More information:
60 Search for "Bitmap Structures" in MSDN
61 */
62
63 #include <stdarg.h>
64 #include <stdlib.h>
65 #include <string.h>
66
67 #include "windef.h"
68 #include "winbase.h"
69 #include "gdi.h"
70 #include "wownt32.h"
71 #include "gdi_private.h"
72 #include "wine/debug.h"
73
74 WINE_DEFAULT_DEBUG_CHANNEL(bitmap);
75
76
77 /*
78 Some of the following helper functions are duplicated in
79 dlls/x11drv/dib.c
80 */
81
82 /***********************************************************************
83 * DIB_GetDIBWidthBytes
84 *
85 * Return the width of a DIB bitmap in bytes. DIB bitmap data is 32-bit aligned.
86 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_87eb.asp
87 */
88 int DIB_GetDIBWidthBytes( int width, int depth )
89 {
90 int words;
91
92 switch(depth)
93 {
94 case 1: words = (width + 31) / 32; break;
95 case 4: words = (width + 7) / 8; break;
96 case 8: words = (width + 3) / 4; break;
97 case 15:
98 case 16: words = (width + 1) / 2; break;
99 case 24: words = (width * 3 + 3)/4; break;
100
101 default:
102 WARN("(%d): Unsupported depth\n", depth );
103 /* fall through */
104 case 32:
105 words = width;
106 }
107 return 4 * words;
108 }
109
110 /***********************************************************************
111 * DIB_GetDIBImageBytes
112 *
113 * Return the number of bytes used to hold the image in a DIB bitmap.
114 */
115 int DIB_GetDIBImageBytes( int width, int height, int depth )
116 {
117 return DIB_GetDIBWidthBytes( width, depth ) * abs( height );
118 }
119
120
121 /***********************************************************************
122 * DIB_BitmapInfoSize
123 *
124 * Return the size of the bitmap info structure including color table.
125 */
126 int DIB_BitmapInfoSize( const BITMAPINFO * info, WORD coloruse )
127 {
128 int colors;
129
130 if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
131 {
132 BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)info;
133 colors = (core->bcBitCount <= 8) ? 1 << core->bcBitCount : 0;
134 return sizeof(BITMAPCOREHEADER) + colors *
135 ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBTRIPLE) : sizeof(WORD));
136 }
137 else /* assume BITMAPINFOHEADER */
138 {
139 colors = info->bmiHeader.biClrUsed;
140 if (colors > 256) colors = 256;
141 if (!colors && (info->bmiHeader.biBitCount <= 8))
142 colors = 1 << info->bmiHeader.biBitCount;
143 return sizeof(BITMAPINFOHEADER) + colors *
144 ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBQUAD) : sizeof(WORD));
145 }
146 }
147
148
149 /***********************************************************************
150 * DIB_GetBitmapInfo
151 *
152 * Get the info from a bitmap header.
153 * Return 1 for INFOHEADER, 0 for COREHEADER,
154 * 4 for V4HEADER, 5 for V5HEADER, -1 for error.
155 */
156 static int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, LONG *width,
157 LONG *height, WORD *planes, WORD *bpp, DWORD *compr, DWORD *size )
158 {
159 if (header->biSize == sizeof(BITMAPINFOHEADER))
160 {
161 *width = header->biWidth;
162 *height = header->biHeight;
163 *planes = header->biPlanes;
164 *bpp = header->biBitCount;
165 *compr = header->biCompression;
166 *size = header->biSizeImage;
167 return 1;
168 }
169 if (header->biSize == sizeof(BITMAPCOREHEADER))
170 {
171 BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)header;
172 *width = core->bcWidth;
173 *height = core->bcHeight;
174 *planes = core->bcPlanes;
175 *bpp = core->bcBitCount;
176 *compr = 0;
177 *size = 0;
178 return 0;
179 }
180 if (header->biSize == sizeof(BITMAPV4HEADER))
181 {
182 BITMAPV4HEADER *v4hdr = (BITMAPV4HEADER *)header;
183 *width = v4hdr->bV4Width;
184 *height = v4hdr->bV4Height;
185 *planes = v4hdr->bV4Planes;
186 *bpp = v4hdr->bV4BitCount;
187 *compr = v4hdr->bV4V4Compression;
188 *size = v4hdr->bV4SizeImage;
189 return 4;
190 }
191 if (header->biSize == sizeof(BITMAPV5HEADER))
192 {
193 BITMAPV5HEADER *v5hdr = (BITMAPV5HEADER *)header;
194 *width = v5hdr->bV5Width;
195 *height = v5hdr->bV5Height;
196 *planes = v5hdr->bV5Planes;
197 *bpp = v5hdr->bV5BitCount;
198 *compr = v5hdr->bV5Compression;
199 *size = v5hdr->bV5SizeImage;
200 return 5;
201 }
202 ERR("(%ld): unknown/wrong size for header\n", header->biSize );
203 return -1;
204 }
205
206
207 /***********************************************************************
208 * StretchDIBits (GDI32.@)
209 */
210 INT WINAPI StretchDIBits(HDC hdc, INT xDst, INT yDst, INT widthDst,
211 INT heightDst, INT xSrc, INT ySrc, INT widthSrc,
212 INT heightSrc, const void *bits,
213 const BITMAPINFO *info, UINT wUsage, DWORD dwRop )
214 {
215 DC *dc;
216
217 if (!bits || !info)
218 return 0;
219
220 dc = DC_GetDCUpdate( hdc );
221 if(!dc) return FALSE;
222
223 if(dc->funcs->pStretchDIBits)
224 {
225 heightSrc = dc->funcs->pStretchDIBits(dc->physDev, xDst, yDst, widthDst,
226 heightDst, xSrc, ySrc, widthSrc,
227 heightSrc, bits, info, wUsage, dwRop);
228 GDI_ReleaseObj( hdc );
229 }
230 else /* use StretchBlt */
231 {
232 HBITMAP hBitmap, hOldBitmap;
233 HPALETTE hpal = NULL;
234 HDC hdcMem;
235 LONG height;
236 LONG width;
237 WORD planes, bpp;
238 DWORD compr, size;
239
240 GDI_ReleaseObj( hdc );
241
242 if (DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &planes, &bpp, &compr, &size ) == -1)
243 {
244 ERR("Invalid bitmap\n");
245 return 0;
246 }
247
248 if (width < 0)
249 {
250 ERR("Bitmap has a negative width\n");
251 return 0;
252 }
253
254 hdcMem = CreateCompatibleDC( hdc );
255 hBitmap = CreateCompatibleBitmap(hdc, width, height);
256 hOldBitmap = SelectObject( hdcMem, hBitmap );
257 if(wUsage == DIB_PAL_COLORS)
258 {
259 hpal = GetCurrentObject(hdc, OBJ_PAL);
260 hpal = SelectPalette(hdcMem, hpal, FALSE);
261 }
262
263 if (info->bmiHeader.biCompression == BI_RLE4 ||
264 info->bmiHeader.biCompression == BI_RLE8) {
265
266 /* when RLE compression is used, there may be some gaps (ie the DIB doesn't
267 * contain all the rectangle described in bmiHeader, but only part of it.
268 * This mean that those undescribed pixels must be left untouched.
269 * So, we first copy on a memory bitmap the current content of the
270 * destination rectangle, blit the DIB bits on top of it - hence leaving
271 * the gaps untouched -, and blitting the rectangle back.
272 * This insure that gaps are untouched on the destination rectangle
273 * Not doing so leads to trashed images (the gaps contain what was on the
274 * memory bitmap => generally black or garbage)
275 * Unfortunately, RLE DIBs without gaps will be slowed down. But this is
276 * another speed vs correctness issue. Anyway, if speed is needed, then the
277 * pStretchDIBits function shall be implemented.
278 * ericP (2000/09/09)
279 */
280
281 /* copy existing bitmap from destination dc */
282 StretchBlt( hdcMem, xSrc, abs(height) - heightSrc - ySrc,
283 widthSrc, heightSrc, hdc, xDst, yDst, widthDst, heightDst,
284 dwRop );
285 }
286
287 SetDIBits(hdcMem, hBitmap, 0, height, bits, info, wUsage);
288
289 /* Origin for DIBitmap may be bottom left (positive biHeight) or top
290 left (negative biHeight) */
291 StretchBlt( hdc, xDst, yDst, widthDst, heightDst,
292 hdcMem, xSrc, abs(height) - heightSrc - ySrc,
293 widthSrc, heightSrc, dwRop );
294 if(hpal)
295 SelectPalette(hdcMem, hpal, FALSE);
296 SelectObject( hdcMem, hOldBitmap );
297 DeleteDC( hdcMem );
298 DeleteObject( hBitmap );
299 }
300 return heightSrc;
301 }
302
303
304 /******************************************************************************
305 * SetDIBits [GDI32.@]
306 *
307 * Sets pixels in a bitmap using colors from DIB.
308 *
309 * PARAMS
310 * hdc [I] Handle to device context
311 * hbitmap [I] Handle to bitmap
312 * startscan [I] Starting scan line
313 * lines [I] Number of scan lines
314 * bits [I] Array of bitmap bits
315 * info [I] Address of structure with data
316 * coloruse [I] Type of color indexes to use
317 *
318 * RETURNS
319 * Success: Number of scan lines copied
320 * Failure: 0
321 */
322 INT WINAPI SetDIBits( HDC hdc, HBITMAP hbitmap, UINT startscan,
323 UINT lines, LPCVOID bits, const BITMAPINFO *info,
324 UINT coloruse )
325 {
326 DC *dc;
327 BITMAPOBJ *bitmap;
328 INT result = 0;
329
330 if (!(dc = DC_GetDCUpdate( hdc )))
331 {
332 if (coloruse == DIB_RGB_COLORS) FIXME( "shouldn't require a DC for DIB_RGB_COLORS\n" );
333 return 0;
334 }
335
336 if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
337 {
338 GDI_ReleaseObj( hdc );
339 return 0;
340 }
341
342 if (!bitmap->funcs && !BITMAP_SetOwnerDC( hbitmap, dc )) goto done;
343
344 if (bitmap->funcs && bitmap->funcs->pSetDIBits)
345 result = bitmap->funcs->pSetDIBits( dc->physDev, hbitmap, startscan, lines,
346 bits, info, coloruse );
347 else
348 result = lines;
349
350 done:
351 GDI_ReleaseObj( hbitmap );
352 GDI_ReleaseObj( hdc );
353 return result;
354 }
355
356
357 /***********************************************************************
358 * SetDIBitsToDevice (GDI32.@)
359 */
360 INT WINAPI SetDIBitsToDevice(HDC hdc, INT xDest, INT yDest, DWORD cx,
361 DWORD cy, INT xSrc, INT ySrc, UINT startscan,
362 UINT lines, LPCVOID bits, const BITMAPINFO *info,
363 UINT coloruse )
364 {
365 INT ret;
366 DC *dc;
367
368 if (!(dc = DC_GetDCUpdate( hdc ))) return 0;
369
370 if(dc->funcs->pSetDIBitsToDevice)
371 ret = dc->funcs->pSetDIBitsToDevice( dc->physDev, xDest, yDest, cx, cy, xSrc,
372 ySrc, startscan, lines, bits,
373 info, coloruse );
374 else {
375 FIXME("unimplemented on hdc %p\n", hdc);
376 ret = 0;
377 }
378
379 GDI_ReleaseObj( hdc );
380 return ret;
381 }
382
383 /***********************************************************************
384 * SetDIBColorTable (GDI32.@)
385 */
386 UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, CONST RGBQUAD *colors )
387 {
388 DC * dc;
389 UINT result = 0;
390
391 if (!(dc = DC_GetDCUpdate( hdc ))) return 0;
392
393 if (dc->funcs->pSetDIBColorTable)
394 result = dc->funcs->pSetDIBColorTable(dc->physDev, startpos, entries, colors);
395
396 GDI_ReleaseObj( hdc );
397 return result;
398 }
399
400
401 /***********************************************************************
402 * GetDIBColorTable (GDI32.@)
403 */
404 UINT WINAPI GetDIBColorTable( HDC hdc, UINT startpos, UINT entries, RGBQUAD *colors )
405 {
406 DC * dc;
407 UINT result = 0;
408
409 if (!(dc = DC_GetDCUpdate( hdc ))) return 0;
410
411 if (dc->funcs->pGetDIBColorTable)
412 result = dc->funcs->pGetDIBColorTable(dc->physDev, startpos, entries, colors);
413
414 GDI_ReleaseObj( hdc );
415 return result;
416 }
417
418 /* FIXME the following two structs should be combined with __sysPalTemplate in
419 objects/color.c - this should happen after de-X11-ing both of these
420 files.
421 NB. RGBQUAD and PALETTEENTRY have different orderings of red, green
422 and blue - sigh */
423
424 static RGBQUAD EGAColorsQuads[16] = {
425 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
426 { 0x00, 0x00, 0x00, 0x00 },
427 { 0x00, 0x00, 0x80, 0x00 },
428 { 0x00, 0x80, 0x00, 0x00 },
429 { 0x00, 0x80, 0x80, 0x00 },
430 { 0x80, 0x00, 0x00, 0x00 },
431 { 0x80, 0x00, 0x80, 0x00 },
432 { 0x80, 0x80, 0x00, 0x00 },
433 { 0x80, 0x80, 0x80, 0x00 },
434 { 0xc0, 0xc0, 0xc0, 0x00 },
435 { 0x00, 0x00, 0xff, 0x00 },
436 { 0x00, 0xff, 0x00, 0x00 },
437 { 0x00, 0xff, 0xff, 0x00 },
438 { 0xff, 0x00, 0x00, 0x00 },
439 { 0xff, 0x00, 0xff, 0x00 },
440 { 0xff, 0xff, 0x00, 0x00 },
441 { 0xff, 0xff, 0xff, 0x00 }
442 };
443
444 static RGBTRIPLE EGAColorsTriples[16] = {
445 /* rgbBlue, rgbGreen, rgbRed */
446 { 0x00, 0x00, 0x00 },
447 { 0x00, 0x00, 0x80 },
448 { 0x00, 0x80, 0x00 },
449 { 0x00, 0x80, 0x80 },
450 { 0x80, 0x00, 0x00 },
451 { 0x80, 0x00, 0x80 },
452 { 0x80, 0x80, 0x00 },
453 { 0x80, 0x80, 0x80 },
454 { 0xc0, 0xc0, 0xc0 },
455 { 0x00, 0x00, 0xff },
456 { 0x00, 0xff, 0x00 },
457 { 0x00, 0xff, 0xff },
458 { 0xff, 0x00, 0x00 } ,
459 { 0xff, 0x00, 0xff },
460 { 0xff, 0xff, 0x00 },
461 { 0xff, 0xff, 0xff }
462 };
463
464 static RGBQUAD DefLogPaletteQuads[20] = { /* Copy of Default Logical Palette */
465 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
466 { 0x00, 0x00, 0x00, 0x00 },
467 { 0x00, 0x00, 0x80, 0x00 },
468 { 0x00, 0x80, 0x00, 0x00 },
469 { 0x00, 0x80, 0x80, 0x00 },
470 { 0x80, 0x00, 0x00, 0x00 },
471 { 0x80, 0x00, 0x80, 0x00 },
472 { 0x80, 0x80, 0x00, 0x00 },
473 { 0xc0, 0xc0, 0xc0, 0x00 },
474 { 0xc0, 0xdc, 0xc0, 0x00 },
475 { 0xf0, 0xca, 0xa6, 0x00 },
476 { 0xf0, 0xfb, 0xff, 0x00 },
477 { 0xa4, 0xa0, 0xa0, 0x00 },
478 { 0x80, 0x80, 0x80, 0x00 },
479 { 0x00, 0x00, 0xf0, 0x00 },
480 { 0x00, 0xff, 0x00, 0x00 },
481 { 0x00, 0xff, 0xff, 0x00 },
482 { 0xff, 0x00, 0x00, 0x00 },
483 { 0xff, 0x00, 0xff, 0x00 },
484 { 0xff, 0xff, 0x00, 0x00 },
485 { 0xff, 0xff, 0xff, 0x00 }
486 };
487
488 static RGBTRIPLE DefLogPaletteTriples[20] = { /* Copy of Default Logical Palette */
489 /* rgbBlue, rgbGreen, rgbRed */
490 { 0x00, 0x00, 0x00 },
491 { 0x00, 0x00, 0x80 },
492 { 0x00, 0x80, 0x00 },
493 { 0x00, 0x80, 0x80 },
494 { 0x80, 0x00, 0x00 },
495 { 0x80, 0x00, 0x80 },
496 { 0x80, 0x80, 0x00 },
497 { 0xc0, 0xc0, 0xc0 },
498 { 0xc0, 0xdc, 0xc0 },
499 { 0xf0, 0xca, 0xa6 },
500 { 0xf0, 0xfb, 0xff },
501 { 0xa4, 0xa0, 0xa0 },
502 { 0x80, 0x80, 0x80 },
503 { 0x00, 0x00, 0xf0 },
504 { 0x00, 0xff, 0x00 },
505 { 0x00, 0xff, 0xff },
506 { 0xff, 0x00, 0x00 },
507 { 0xff, 0x00, 0xff },
508 { 0xff, 0xff, 0x00 },
509 { 0xff, 0xff, 0xff}
510 };
511
512
513 /******************************************************************************
514 * GetDIBits [GDI32.@]
515 *
516 * Retrieves bits of bitmap and copies to buffer.
517 *
518 * RETURNS
519 * Success: Number of scan lines copied from bitmap
520 * Failure: 0
521 *
522 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_87eb.asp
523 */
524 INT WINAPI GetDIBits(
525 HDC hdc, /* [in] Handle to device context */
526 HBITMAP hbitmap, /* [in] Handle to bitmap */
527 UINT startscan, /* [in] First scan line to set in dest bitmap */
528 UINT lines, /* [in] Number of scan lines to copy */
529 LPVOID bits, /* [out] Address of array for bitmap bits */
530 BITMAPINFO * info, /* [out] Address of structure with bitmap data */
531 UINT coloruse) /* [in] RGB or palette index */
532 {
533 DC * dc;
534 BITMAPOBJ * bmp;
535 int i;
536 HDC memdc;
537 int bitmap_type;
538 BOOL core_header;
539 LONG width;
540 LONG height;
541 WORD planes, bpp;
542 DWORD compr, size;
543 void* colorPtr;
544 RGBTRIPLE* rgbTriples;
545 RGBQUAD* rgbQuads;
546
547 if (!info) return 0;
548
549 bitmap_type = DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &planes, &bpp, &compr, &size);
550 if (bitmap_type == -1)
551 {
552 ERR("Invalid bitmap format\n");
553 return 0;
554 }
555 core_header = (bitmap_type == 0);
556 memdc = CreateCompatibleDC(hdc);
557 if (!(dc = DC_GetDCUpdate( hdc )))
558 {
559 DeleteDC(memdc);
560 return 0;
561 }
562 if (!(bmp = (BITMAPOBJ *)GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
563 {
564 GDI_ReleaseObj( hdc );
565 DeleteDC(memdc);
566 return 0;
567 }
568
569 colorPtr = (LPBYTE) info + (WORD) info->bmiHeader.biSize;
570 rgbTriples = (RGBTRIPLE *) colorPtr;
571 rgbQuads = (RGBQUAD *) colorPtr;
572
573 /* Transfer color info */
574
575 if (bpp <= 8 && bpp > 0)
576 {
577 if (!core_header) info->bmiHeader.biClrUsed = 0;
578
579 /* If the bitmap object already has a dib section at the
580 same color depth then get the color map from it */
581 if (bmp->dib && bmp->dib->dsBm.bmBitsPixel == bpp) {
582 if(coloruse == DIB_RGB_COLORS) {
583 HBITMAP oldbm = SelectObject(memdc, hbitmap);
584 unsigned int colors = 1 << bpp;
585
586 if (core_header)
587 {
588 /* Convert the color table (RGBQUAD to RGBTRIPLE) */
589 RGBQUAD* buffer = HeapAlloc(GetProcessHeap(), 0, colors * sizeof(RGBQUAD));
590
591 if (buffer)
592 {
593 RGBTRIPLE* index = rgbTriples;
594 GetDIBColorTable(memdc, 0, colors, buffer);
595
596 for (i=0; i < colors; i++, index++)
597 {
598 index->rgbtRed = buffer[i].rgbRed;
599 index->rgbtGreen = buffer[i].rgbGreen;
600 index->rgbtBlue = buffer[i].rgbBlue;
601 }
602
603 HeapFree(GetProcessHeap(), 0, buffer);
604 }
605 }
606 else
607 {
608 GetDIBColorTable(memdc, 0, colors, colorPtr);
609 }
610 SelectObject(memdc, oldbm);
611 }
612 else {
613 WORD *index = colorPtr;
614 for(i = 0; i < 1 << info->bmiHeader.biBitCount; i++, index++)
615 *index = i;
616 }
617 }
618 else {
619 if(bpp >= bmp->bitmap.bmBitsPixel) {
620 /* Generate the color map from the selected palette */
621 PALETTEENTRY * palEntry;
622 PALETTEOBJ * palette;
623 if (!(palette = (PALETTEOBJ*)GDI_GetObjPtr( dc->hPalette, PALETTE_MAGIC ))) {
624 GDI_ReleaseObj( hdc );
625 GDI_ReleaseObj( hbitmap );
626 DeleteDC(memdc);
627 return 0;
628 }
629 palEntry = palette->logpalette.palPalEntry;
630 for (i = 0; i < (1 << bmp->bitmap.bmBitsPixel); i++, palEntry++) {
631 if (coloruse == DIB_RGB_COLORS) {
632 if (core_header)
633 {
634 rgbTriples[i].rgbtRed = palEntry->peRed;
635 rgbTriples[i].rgbtGreen = palEntry->peGreen;
636 rgbTriples[i].rgbtBlue = palEntry->peBlue;
637 }
638 else
639 {
640 rgbQuads[i].rgbRed = palEntry->peRed;
641 rgbQuads[i].rgbGreen = palEntry->peGreen;
642 rgbQuads[i].rgbBlue = palEntry->peBlue;
643 rgbQuads[i].rgbReserved = 0;
644 }
645 }
646 else ((WORD *)colorPtr)[i] = (WORD)i;
647 }
648 GDI_ReleaseObj( dc->hPalette );
649 } else {
650 switch (bpp) {
651 case 1:
652 if (core_header)
653 {
654 rgbTriples[0].rgbtRed = rgbTriples[0].rgbtGreen =
655 rgbTriples[0].rgbtBlue = 0;
656 rgbTriples[1].rgbtRed = rgbTriples[1].rgbtGreen =
657 rgbTriples[1].rgbtBlue = 0xff;
658 }
659 else
660 {
661 rgbQuads[0].rgbRed = rgbQuads[0].rgbGreen =
662 rgbQuads[0].rgbBlue = 0;
663 rgbQuads[0].rgbReserved = 0;
664 rgbQuads[1].rgbRed = rgbQuads[1].rgbGreen =
665 rgbQuads[1].rgbBlue = 0xff;
666 rgbQuads[1].rgbReserved = 0;
667 }
668 break;
669
670 case 4:
671 if (core_header)
672 memcpy(colorPtr, EGAColorsTriples, sizeof(EGAColorsTriples));
673 else
674 memcpy(colorPtr, EGAColorsQuads, sizeof(EGAColorsQuads));
675
676 break;
677
678 case 8:
679 {
680 if (core_header)
681 {
682 INT r, g, b;
683 RGBTRIPLE *color;
684
685 memcpy(rgbTriples, DefLogPaletteTriples,
686 10 * sizeof(RGBTRIPLE));
687 memcpy(rgbTriples + 246, DefLogPaletteTriples + 10,
688 10 * sizeof(RGBTRIPLE));
689 color = rgbTriples + 10;
690 for(r = 0; r <= 5; r++) /* FIXME */
691 for(g = 0; g <= 5; g++)
692 for(b = 0; b <= 5; b++) {
693 color->rgbtRed = (r * 0xff) / 5;
694 color->rgbtGreen = (g * 0xff) / 5;
695 color->rgbtBlue = (b * 0xff) / 5;
696 color++;
697 }
698 }
699 else
700 {
701 INT r, g, b;
702 RGBQUAD *color;
703
704 memcpy(rgbQuads, DefLogPaletteQuads,
705 10 * sizeof(RGBQUAD));
706 memcpy(rgbQuads + 246, DefLogPaletteQuads + 10,
707 10 * sizeof(RGBQUAD));
708 color = rgbQuads + 10;
709 for(r = 0; r <= 5; r++) /* FIXME */
710 for(g = 0; g <= 5; g++)
711 for(b = 0; b <= 5; b++) {
712 color->rgbRed = (r * 0xff) / 5;
713 color->rgbGreen = (g * 0xff) / 5;
714 color->rgbBlue = (b * 0xff) / 5;
715 color->rgbReserved = 0;
716 color++;
717 }
718 }
719 }
720 }
721 }
722 }
723 }
724
725 if (bits && lines)
726 {
727 /* If the bitmap object already have a dib section that contains image data, get the bits from it */
728 if(bmp->dib && bmp->dib->dsBm.bmBitsPixel >= 15 && bpp >= 15)
729 {
730 /*FIXME: Only RGB dibs supported for now */
731 unsigned int srcwidth = bmp->dib->dsBm.bmWidth, srcwidthb = bmp->dib->dsBm.bmWidthBytes;
732 unsigned int dstwidth = width;
733 int dstwidthb = DIB_GetDIBWidthBytes( width, bpp );
734 LPBYTE dbits = bits, sbits = (LPBYTE) bmp->dib->dsBm.bmBits + (startscan * srcwidthb);
735 unsigned int x, y, width, widthb;
736
737 if ((height < 0) ^ (bmp->dib->dsBmih.biHeight < 0))
738 {
739 dbits = (LPBYTE)bits + (dstwidthb * (lines-1));
740 dstwidthb = -dstwidthb;
741 }
742
743 switch( bpp ) {
744
745 case 15:
746 case 16: /* 16 bpp dstDIB */
747 {
748 LPWORD dstbits = (LPWORD)dbits;
749 WORD rmask = 0x7c00, gmask= 0x03e0, bmask = 0x001f;
750
751 /* FIXME: BI_BITFIELDS not supported yet */
752
753 switch(bmp->dib->dsBm.bmBitsPixel) {
754
755 case 16: /* 16 bpp srcDIB -> 16 bpp dstDIB */
756 {
757 widthb = min(srcwidthb, abs(dstwidthb));
758 /* FIXME: BI_BITFIELDS not supported yet */
759 for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb)
760 memcpy(dbits, sbits, widthb);
761 }
762 break;
763
764 case 24: /* 24 bpp srcDIB -> 16 bpp dstDIB */
765 {
766 LPBYTE srcbits = sbits;
767
768 width = min(srcwidth, dstwidth);
769 for( y = 0; y < lines; y++) {
770 for( x = 0; x < width; x++, srcbits += 3)
771 *dstbits++ = ((srcbits[0] >> 3) & bmask) |
772 (((WORD)srcbits[1] << 2) & gmask) |
773 (((WORD)srcbits[2] << 7) & rmask);
774
775 dstbits = (LPWORD)(dbits+=dstwidthb);
776 srcbits = (sbits += srcwidthb);
777 }
778 }
779 break;
780
781 case 32: /* 32 bpp srcDIB -> 16 bpp dstDIB */
782 {
783 LPDWORD srcbits = (LPDWORD)sbits;
784 DWORD val;
785
786 width = min(srcwidth, dstwidth);
787 for( y = 0; y < lines; y++) {
788 for( x = 0; x < width; x++ ) {
789 val = *srcbits++;
790 *dstbits++ = (WORD)(((val >> 3) & bmask) | ((val >> 6) & gmask) |
791 ((val >> 9) & rmask));
792 }
793 dstbits = (LPWORD)(dbits+=dstwidthb);
794 srcbits = (LPDWORD)(sbits+=srcwidthb);
795 }
796 }
797 break;
798
799 default: /* ? bit bmp -> 16 bit DIB */
800 FIXME("15/16 bit DIB %d bit bitmap\n",
801 bmp->bitmap.bmBitsPixel);
802 break;
803 }
804 }
805 break;
806
807 case 24: /* 24 bpp dstDIB */
808 {
809 LPBYTE dstbits = dbits;
810
811 switch(bmp->dib->dsBm.bmBitsPixel) {
812
813 case 16: /* 16 bpp srcDIB -> 24 bpp dstDIB */
814 {
815 LPWORD srcbits = (LPWORD)sbits;
816 WORD val;
817
818 width = min(srcwidth, dstwidth);
819 /* FIXME: BI_BITFIELDS not supported yet */
820 for( y = 0; y < lines; y++) {
821 for( x = 0; x < width; x++ ) {
822 val = *srcbits++;
823 *dstbits++ = (BYTE)(((val << 3) & 0xf8) | ((val >> 2) & 0x07));
824 *dstbits++ = (BYTE)(((val >> 2) & 0xf8) | ((val >> 7) & 0x07));
825 *dstbits++ = (BYTE)(((val >> 7) & 0xf8) | ((val >> 12) & 0x07));
826 }
827 dstbits = (LPBYTE)(dbits+=dstwidthb);
828 srcbits = (LPWORD)(sbits+=srcwidthb);
829 }
830 }
831 break;
832
833 case 24: /* 24 bpp srcDIB -> 24 bpp dstDIB */
834 {
835 widthb = min(srcwidthb, abs(dstwidthb));
836 for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb)
837 memcpy(dbits, sbits, widthb);
838 }
839 break;
840
841 case 32: /* 32 bpp srcDIB -> 24 bpp dstDIB */
842 {
843 LPBYTE srcbits = (LPBYTE)sbits;
844
845 width = min(srcwidth, dstwidth);
846 for( y = 0; y < lines; y++) {
847 for( x = 0; x < width; x++, srcbits++ ) {
848 *dstbits++ = *srcbits++;
849 *dstbits++ = *srcbits++;
850 *dstbits++ = *srcbits++;
851 }
852 dstbits=(LPBYTE)(dbits+=dstwidthb);
853 srcbits = (LPBYTE)(sbits+=srcwidthb);
854 }
855 }
856 break;
857
858 default: /* ? bit bmp -> 24 bit DIB */
859 FIXME("24 bit DIB %d bit bitmap\n",
860 bmp->bitmap.bmBitsPixel);
861 break;
862 }
863 }
864 break;
865
866 case 32: /* 32 bpp dstDIB */
867 {
868 LPDWORD dstbits = (LPDWORD)dbits;
869
870 /* FIXME: BI_BITFIELDS not supported yet */
871
872 switch(bmp->dib->dsBm.bmBitsPixel) {
873 case 16: /* 16 bpp srcDIB -> 32 bpp dstDIB */
874 {
875 LPWORD srcbits = (LPWORD)sbits;
876 DWORD val;
877
878 width = min(srcwidth, dstwidth);
879 /* FIXME: BI_BITFIELDS not supported yet */
880 for( y = 0; y < lines; y++) {
881 for( x = 0; x < width; x++ ) {
882 val = (DWORD)*srcbits++;
883 *dstbits++ = ((val << 3) & 0xf8) | ((val >> 2) & 0x07) |
884 ((val << 6) & 0xf800) | ((val << 1) & 0x0700) |
885 ((val << 9) & 0xf80000) | ((val << 4) & 0x070000);
886 }
887 dstbits=(LPDWORD)(dbits+=dstwidthb);
888 srcbits=(LPWORD)(sbits+=srcwidthb);
889 }
890 }
891 break;
892
893 case 24: /* 24 bpp srcDIB -> 32 bpp dstDIB */
894 {
895 LPBYTE srcbits = sbits;
896
897 width = min(srcwidth, dstwidth);
898 for( y = 0; y < lines; y++) {
899 for( x = 0; x < width; x++, srcbits+=3 )
900 *dstbits++ = srcbits[0] |
901 (srcbits[1] << 8) |
902 (srcbits[2] << 16);
903 dstbits=(LPDWORD)(dbits+=dstwidthb);
904 srcbits=(sbits+=srcwidthb);
905 }
906 }
907 break;
908
909 case 32: /* 32 bpp srcDIB -> 32 bpp dstDIB */
910 {
911 widthb = min(srcwidthb, abs(dstwidthb));
912 /* FIXME: BI_BITFIELDS not supported yet */
913 for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb) {
914 memcpy(dbits, sbits, widthb);
915 }
916 }
917 break;
918
919 default: /* ? bit bmp -> 32 bit DIB */
920 FIXME("32 bit DIB %d bit bitmap\n",
921 bmp->bitmap.bmBitsPixel);
922 break;
923 }
924 }
925 break;
926
927 default: /* ? bit DIB */
928 FIXME("Unsupported DIB depth %d\n", info->bmiHeader.biBitCount);
929 break;
930 }
931 }
932 /* Otherwise, get bits from the XImage */
933 else
934 {
935 if (!bmp->funcs && !BITMAP_SetOwnerDC( hbitmap, dc )) lines = 0;
936 else
937 {
938 if (bmp->funcs && bmp->funcs->pGetDIBits)
939 lines = bmp->funcs->pGetDIBits( dc->physDev, hbitmap, startscan,
940 lines, bits, info, coloruse );
941 else
942 lines = 0; /* FIXME: should copy from bmp->bitmap.bmBits */
943 }
944 }
945 }
946 else
947 {
948 /* fill in struct members */
949
950 if (bpp == 0)
951 {
952 if (core_header)
953 {
954 BITMAPCOREHEADER* coreheader = (BITMAPCOREHEADER*) info;
955 coreheader->bcWidth = bmp->bitmap.bmWidth;
956 coreheader->bcHeight = bmp->bitmap.bmHeight;
957 coreheader->bcPlanes = 1;
958 coreheader->bcBitCount = bmp->bitmap.bmBitsPixel;
959 }
960 else
961 {
962 info->bmiHeader.biWidth = bmp->bitmap.bmWidth;
963 info->bmiHeader.biHeight = bmp->bitmap.bmHeight;
964 info->bmiHeader.biPlanes = 1;
965 info->bmiHeader.biSizeImage =
966 DIB_GetDIBImageBytes( bmp->bitmap.bmWidth,
967 bmp->bitmap.bmHeight,
968 bmp->bitmap.bmBitsPixel );
969 switch(bmp->bitmap.bmBitsPixel)
970 {
971 case 15:
972 info->bmiHeader.biBitCount = 16;
973 info->bmiHeader.biCompression = BI_RGB;
974 break;
975
976 case 16:
977 info->bmiHeader.biBitCount = 16;
978 info->bmiHeader.biCompression = BI_BITFIELDS;
979 ((PDWORD)info->bmiColors)[0] = 0xf800;
980 ((PDWORD)info->bmiColors)[1] = 0x07e0;
981 ((PDWORD)info->bmiColors)[2] = 0x001f;
982 break;
983
984 default:
985 info->bmiHeader.biBitCount = bmp->bitmap.bmBitsPixel;
986 info->bmiHeader.biCompression = BI_RGB;
987 break;
988 }
989 info->bmiHeader.biXPelsPerMeter = 0;
990 info->bmiHeader.biYPelsPerMeter = 0;
991 info->bmiHeader.biClrUsed = 0;
992 info->bmiHeader.biClrImportant = 0;
993
994 /* Windows 2000 doesn't touch the additional struct members if
995 it's a BITMAPV4HEADER or a BITMAPV5HEADER */
996 }
997 lines = abs(bmp->bitmap.bmHeight);
998 }
999 else
1000 {
1001 /* The knowledge base article Q81498 ("DIBs and Their Uses") states that
1002 if bits == NULL and bpp != 0, only biSizeImage and the color table are
1003 filled in. */
1004 if (!core_header)
1005 {
1006 /* FIXME: biSizeImage should be calculated according to the selected
1007 compression algorithm if biCompression != BI_RGB */
1008 info->bmiHeader.biSizeImage = DIB_GetDIBImageBytes( width, height, bpp );
1009 }
1010 lines = abs(height);
1011 }
1012 }
1013
1014 if (!core_header)
1015 {
1016 TRACE("biSizeImage = %ld, ", info->bmiHeader.biSizeImage);
1017 }
1018 TRACE("biWidth = %ld, biHeight = %ld\n", width, height);
1019
1020 GDI_ReleaseObj( hdc );
1021 GDI_ReleaseObj( hbitmap );
1022 DeleteDC(memdc);
1023 return lines;
1024 }
1025
1026
1027 /***********************************************************************
1028 * CreateDIBitmap (GDI32.@)
1029 *
1030 * Creates a DDB (device dependent bitmap) from a DIB.
1031 * The DDB will have the same color depth as the reference DC.
1032 */
1033 HBITMAP WINAPI CreateDIBitmap( HDC hdc, const BITMAPINFOHEADER *header,
1034 DWORD init, LPCVOID bits, const BITMAPINFO *data,
1035 UINT coloruse )
1036 {
1037 HBITMAP handle;
1038 LONG width;
1039 LONG height;
1040 WORD planes, bpp;
1041 DWORD compr, size;
1042 DC *dc;
1043
1044 if (DIB_GetBitmapInfo( header, &width, &height, &planes, &bpp, &compr, &size ) == -1) return 0;
1045
1046 if (width < 0)
1047 {
1048 TRACE("Bitmap has a negative width\n");
1049 return 0;
1050 }
1051
1052 /* Top-down DIBs have a negative height */
1053 if (height < 0) height = -height;
1054
1055 TRACE("hdc=%p, header=%p, init=%lu, bits=%p, data=%p, coloruse=%u (bitmap: width=%ld, height=%ld, bpp=%u, compr=%lu)\n",
1056 hdc, header, init, bits, data, coloruse, width, height, bpp, compr);
1057
1058 if (hdc == NULL)
1059 handle = CreateBitmap( width, height, 1, 1, NULL );
1060 else
1061 handle = CreateCompatibleBitmap( hdc, width, height );
1062
1063 if (handle)
1064 {
1065 if (init == CBM_INIT) SetDIBits( hdc, handle, 0, height, bits, data, coloruse );
1066
1067 else if (hdc && ((dc = DC_GetDCPtr( hdc )) != NULL) )
1068 {
1069 if (!BITMAP_SetOwnerDC( handle, dc ))
1070 {
1071 DeleteObject( handle );
1072 handle = 0;
1073 }
1074 GDI_ReleaseObj( hdc );
1075 }
1076 }
1077
1078 return handle;
1079 }
1080
1081 /***********************************************************************
1082 * CreateDIBSection (GDI.489)
1083 */
1084 HBITMAP16 WINAPI CreateDIBSection16 (HDC16 hdc, const BITMAPINFO *bmi, UINT16 usage,
1085 SEGPTR *bits16, HANDLE section, DWORD offset)
1086 {
1087 LPVOID bits32;
1088 HBITMAP hbitmap;
1089
1090 hbitmap = CreateDIBSection( HDC_32(hdc), bmi, usage, &bits32, section, offset );
1091 if (hbitmap)
1092 {
1093 BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr(hbitmap, BITMAP_MAGIC);
1094 if (bmp && bmp->dib && bits32)
1095 {
1096 const BITMAPINFOHEADER *bi = &bmi->bmiHeader;
1097 LONG width, height;
1098 WORD planes, bpp;
1099 DWORD compr, size;
1100 INT width_bytes;
1101 WORD count, sel;
1102 int i;
1103
1104 DIB_GetBitmapInfo(bi, &width, &height, &planes, &bpp, &compr, &size);
1105
1106 height = height >= 0 ? height : -height;
1107 width_bytes = DIB_GetDIBWidthBytes(width, bpp);
1108
1109 if (!size || (compr != BI_RLE4 && compr != BI_RLE8)) size = width_bytes * height;
1110
1111 /* calculate number of sel's needed for size with 64K steps */
1112 count = (size + 0xffff) / 0x10000;
1113 sel = AllocSelectorArray16(count);
1114
1115 for (i = 0; i < count; i++)
1116 {
1117 SetSelectorBase(sel + (i << __AHSHIFT), (DWORD)bits32 + i * 0x10000);
1118 SetSelectorLimit16(sel + (i << __AHSHIFT), size - 1); /* yep, limit is correct */
1119 size -= 0x10000;
1120 }
1121 bmp->segptr_bits = MAKESEGPTR( sel, 0 );
1122 if (bits16) *bits16 = bmp->segptr_bits;
1123 }
1124 if (bmp) GDI_ReleaseObj( hbitmap );
1125 }
1126 return HBITMAP_16(hbitmap);
1127 }
1128
1129 /***********************************************************************
1130 * DIB_CreateDIBSection
1131 */
1132 HBITMAP DIB_CreateDIBSection(HDC hdc, const BITMAPINFO *bmi, UINT usage,
1133 VOID **bits, HANDLE section,
1134 DWORD offset, DWORD ovr_pitch)
1135 {
1136 HBITMAP ret = 0;
1137 DC *dc;
1138 BOOL bDesktopDC = FALSE;
1139 DIBSECTION *dib;
1140 BITMAPOBJ *bmp;
1141 int bitmap_type;
1142 LONG width, height;
1143 WORD planes, bpp;
1144 DWORD compression, sizeImage;
1145 void *mapBits = NULL;
1146
1147 if (((bitmap_type = DIB_GetBitmapInfo( &bmi->bmiHeader, &width, &height,
1148 &planes, &bpp, &compression, &sizeImage )) == -1))
1149 return 0;
1150
1151 if (compression != BI_RGB && compression != BI_BITFIELDS)
1152 {
1153 TRACE("can't create a compressed (%lu) dibsection\n", compression);
1154 return 0;
1155 }
1156
1157 if (!(dib = HeapAlloc( GetProcessHeap(), 0, sizeof(*dib) ))) return 0;
1158
1159 TRACE("format (%ld,%ld), planes %d, bpp %d, size %ld, %s\n",
1160 width, height, planes, bpp, sizeImage, usage == DIB_PAL_COLORS? "PAL" : "RGB");
1161
1162 dib->dsBm.bmType = 0;
1163 dib->dsBm.bmWidth = width;
1164 dib->dsBm.bmHeight = height >= 0 ? height : -height;
1165 dib->dsBm.bmWidthBytes = ovr_pitch ? ovr_pitch : DIB_GetDIBWidthBytes(width, bpp);
1166 dib->dsBm.bmPlanes = planes;
1167 dib->dsBm.bmBitsPixel = bpp;
1168 dib->dsBm.bmBits = NULL;
1169
1170 if (!bitmap_type) /* core header */
1171 {
1172 /* convert the BITMAPCOREHEADER to a BITMAPINFOHEADER */
1173 dib->dsBmih.biSize = sizeof(BITMAPINFOHEADER);
1174 dib->dsBmih.biWidth = width;
1175 dib->dsBmih.biHeight = height;
1176 dib->dsBmih.biPlanes = planes;
1177 dib->dsBmih.biBitCount = bpp;
1178 dib->dsBmih.biCompression = compression;
1179 dib->dsBmih.biXPelsPerMeter = 0;
1180 dib->dsBmih.biYPelsPerMeter = 0;
1181 dib->dsBmih.biClrUsed = 0;
1182 dib->dsBmih.biClrImportant = 0;
1183 }
1184 else
1185 {
1186 /* truncate extended bitmap headers (BITMAPV4HEADER etc.) */
1187 dib->dsBmih = bmi->bmiHeader;
1188 dib->dsBmih.biSize = sizeof(BITMAPINFOHEADER);
1189 }
1190
1191 /* set number of entries in bmi.bmiColors table */
1192 if( bpp <= 8 )
1193 dib->dsBmih.biClrUsed = 1 << bpp;
1194
1195 dib->dsBmih.biSizeImage = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
1196
1197 /* set dsBitfields values */
1198 if (usage == DIB_PAL_COLORS || bpp <= 8)
1199 {
1200 dib->dsBitfields[0] = dib->dsBitfields[1] = dib->dsBitfields[2] = 0;
1201 }
1202 else switch( bpp )
1203 {
1204 case 15:
1205 case 16:
1206 dib->dsBitfields[0] = (compression == BI_BITFIELDS) ? *(const DWORD *)bmi->bmiColors : 0x7c00;
1207 dib->dsBitfields[1] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 1) : 0x03e0;
1208 dib->dsBitfields[2] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 2) : 0x001f;
1209 break;
1210 case 24:
1211 case 32:
1212 dib->dsBitfields[0] = (compression == BI_BITFIELDS) ? *(const DWORD *)bmi->bmiColors : 0xff0000;
1213 dib->dsBitfields[1] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 1) : 0x00ff00;
1214 dib->dsBitfields[2] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 2) : 0x0000ff;
1215 break;
1216 }
1217
1218 /* get storage location for DIB bits */
1219
1220 if (section)
1221 {
1222 SYSTEM_INFO SystemInfo;
1223 DWORD mapOffset;
1224 INT mapSize;
1225
1226 GetSystemInfo( &SystemInfo );
1227 mapOffset = offset - (offset % SystemInfo.dwAllocationGranularity);
1228 mapSize = dib->dsBmih.biSizeImage + (offset - mapOffset);
1229 mapBits = MapViewOfFile( section, FILE_MAP_ALL_ACCESS, 0, mapOffset, mapSize );
1230 if (mapBits) dib->dsBm.bmBits = (char *)mapBits + (offset - mapOffset);
1231 }
1232 else if (ovr_pitch && offset)
1233 dib->dsBm.bmBits = (LPVOID) offset;
1234 else
1235 {
1236 offset = 0;
1237 dib->dsBm.bmBits = VirtualAlloc( NULL, dib->dsBmih.biSizeImage,
1238 MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE );
1239 }
1240 dib->dshSection = section;
1241 dib->dsOffset = offset;
1242
1243 if (!dib->dsBm.bmBits)
1244 {
1245 HeapFree( GetProcessHeap(), 0, dib );
1246 return 0;
1247 }
1248
1249 /* If the reference hdc is null, take the desktop dc */
1250 if (hdc == 0)
1251 {
1252 hdc = CreateCompatibleDC(0);
1253 bDesktopDC = TRUE;
1254 }
1255
1256 if (!(dc = DC_GetDCPtr( hdc ))) goto error;
1257
1258 /* create Device Dependent Bitmap and add DIB pointer */
1259 ret = CreateBitmap( dib->dsBm.bmWidth, dib->dsBm.bmHeight, 1,
1260 (bpp == 1) ? 1 : GetDeviceCaps(hdc, BITSPIXEL), NULL );
1261
1262 if (ret && ((bmp = GDI_GetObjPtr(ret, BITMAP_MAGIC))))
1263 {
1264 bmp->dib = dib;
1265 bmp->funcs = dc->funcs;
1266 GDI_ReleaseObj( ret );
1267
1268 if (dc->funcs->pCreateDIBSection)
1269 {
1270 if (!dc->funcs->pCreateDIBSection(dc->physDev, ret, bmi, usage))
1271 {
1272 DeleteObject( ret );
1273 ret = 0;
1274 }
1275 }
1276 }
1277
1278 GDI_ReleaseObj(hdc);
1279 if (bDesktopDC) DeleteDC( hdc );
1280 if (ret && bits) *bits = dib->dsBm.bmBits;
1281 return ret;
1282
1283 error:
1284 if (bDesktopDC) DeleteDC( hdc );
1285 if (section) UnmapViewOfFile( mapBits );
1286 else if (!offset) VirtualFree( dib->dsBm.bmBits, 0, MEM_RELEASE );
1287 HeapFree( GetProcessHeap(), 0, dib );
1288 return 0;
1289 }
1290
1291 /***********************************************************************
1292 * CreateDIBSection (GDI32.@)
1293 */
1294 HBITMAP WINAPI CreateDIBSection(HDC hdc, CONST BITMAPINFO *bmi, UINT usage,
1295 VOID **bits, HANDLE section,
1296 DWORD offset)
1297 {
1298 return DIB_CreateDIBSection(hdc, bmi, usage, bits, section, offset, 0);
1299 }
Maarten's multimedia branch