dlls/gdi32/dib.c

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "wownt32.h"
  70 #include "gdi_private.h"
  71 #include "wine/debug.h"
  72
  73 WINE_DEFAULT_DEBUG_CHANNEL(bitmap);
  74
  75
  76 /*
  77   Some of the following helper functions are duplicated in
  78   dlls/x11drv/dib.c
  79 */
  80
  81 /***********************************************************************
  82  *           DIB_GetDIBWidthBytes
  83  *
  84  * Return the width of a DIB bitmap in bytes. DIB bitmap data is 32-bit aligned.
  85  * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_87eb.asp
  86  */
  87 int DIB_GetDIBWidthBytes( int width, int depth )
  88 {
  89     int words;
  90
  91     switch(depth)
  92     {
  93         case 1:  words = (width + 31) / 32; break;
  94         case 4:  words = (width + 7) / 8; break;
  95         case 8:  words = (width + 3) / 4; break;
  96         case 15:
  97         case 16: words = (width + 1) / 2; break;
  98         case 24: words = (width * 3 + 3)/4; break;
  99
 100         default:
 101             WARN("(%d): Unsupported depth\n", depth );
 102         /* fall through */
 103         case 32:
 104                 words = width;
 105     }
 106     return 4 * words;
 107 }
 108
 109 /***********************************************************************
 110  *           DIB_GetDIBImageBytes
 111  *
 112  * Return the number of bytes used to hold the image in a DIB bitmap.
 113  */
 114 int DIB_GetDIBImageBytes( int width, int height, int depth )
 115 {
 116     return DIB_GetDIBWidthBytes( width, depth ) * abs( height );
 117 }
 118
 119
 120 /***********************************************************************
 121  *           DIB_BitmapInfoSize
 122  *
 123  * Return the size of the bitmap info structure including color table.
 124  */
 125 int DIB_BitmapInfoSize( const BITMAPINFO * info, WORD coloruse )
 126 {
 127     int colors;
 128
 129     if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
 130     {
 131         const BITMAPCOREHEADER *core = (const BITMAPCOREHEADER *)info;
 132         colors = (core->bcBitCount <= 8) ? 1 << core->bcBitCount : 0;
 133         return sizeof(BITMAPCOREHEADER) + colors *
 134              ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBTRIPLE) : sizeof(WORD));
 135     }
 136     else  /* assume BITMAPINFOHEADER */
 137     {
 138         colors = info->bmiHeader.biClrUsed;
 139         if (colors > 256) colors = 256;
 140         if (!colors && (info->bmiHeader.biBitCount <= 8))
 141             colors = 1 << info->bmiHeader.biBitCount;
 142         return sizeof(BITMAPINFOHEADER) + colors *
 143                ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBQUAD) : sizeof(WORD));
 144     }
 145 }
 146
 147
 148 /***********************************************************************
 149  *           DIB_GetBitmapInfo
 150  *
 151  * Get the info from a bitmap header.
 152  * Return 1 for INFOHEADER, 0 for COREHEADER,
 153  * 4 for V4HEADER, 5 for V5HEADER, -1 for error.
 154  */
 155 static int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, LONG *width,
 156                               LONG *height, WORD *planes, WORD *bpp, DWORD *compr, DWORD *size )
 157 {
 158     if (header->biSize == sizeof(BITMAPINFOHEADER))
 159     {
 160         *width  = header->biWidth;
 161         *height = header->biHeight;
 162         *planes = header->biPlanes;
 163         *bpp    = header->biBitCount;
 164         *compr  = header->biCompression;
 165         *size   = header->biSizeImage;
 166         return 1;
 167     }
 168     if (header->biSize == sizeof(BITMAPCOREHEADER))
 169     {
 170         const BITMAPCOREHEADER *core = (const BITMAPCOREHEADER *)header;
 171         *width  = core->bcWidth;
 172         *height = core->bcHeight;
 173         *planes = core->bcPlanes;
 174         *bpp    = core->bcBitCount;
 175         *compr  = 0;
 176         *size   = 0;
 177         return 0;
 178     }
 179     if (header->biSize == sizeof(BITMAPV4HEADER))
 180     {
 181         const BITMAPV4HEADER *v4hdr = (const BITMAPV4HEADER *)header;
 182         *width  = v4hdr->bV4Width;
 183         *height = v4hdr->bV4Height;
 184         *planes = v4hdr->bV4Planes;
 185         *bpp    = v4hdr->bV4BitCount;
 186         *compr  = v4hdr->bV4V4Compression;
 187         *size   = v4hdr->bV4SizeImage;
 188         return 4;
 189     }
 190     if (header->biSize == sizeof(BITMAPV5HEADER))
 191     {
 192         const BITMAPV5HEADER *v5hdr = (const BITMAPV5HEADER *)header;
 193         *width  = v5hdr->bV5Width;
 194         *height = v5hdr->bV5Height;
 195         *planes = v5hdr->bV5Planes;
 196         *bpp    = v5hdr->bV5BitCount;
 197         *compr  = v5hdr->bV5Compression;
 198         *size   = v5hdr->bV5SizeImage;
 199         return 5;
 200     }
 201     ERR("(%d): unknown/wrong size for header\n", header->biSize );
 202     return -1;
 203 }
 204
 205
 206 /***********************************************************************
 207  *           StretchDIBits   (GDI32.@)
 208  */
 209 INT WINAPI StretchDIBits(HDC hdc, INT xDst, INT yDst, INT widthDst,
 210                        INT heightDst, INT xSrc, INT ySrc, INT widthSrc,
 211                        INT heightSrc, const void *bits,
 212                        const BITMAPINFO *info, UINT wUsage, DWORD dwRop )
 213 {
 214     DC *dc;
 215
 216     if (!bits || !info)
 217         return 0;
 218
 219     dc = DC_GetDCUpdate( hdc );
 220     if(!dc) return FALSE;
 221
 222     if(dc->funcs->pStretchDIBits)
 223     {
 224         heightSrc = dc->funcs->pStretchDIBits(dc->physDev, xDst, yDst, widthDst,
 225                                               heightDst, xSrc, ySrc, widthSrc,
 226                                               heightSrc, bits, info, wUsage, dwRop);
 227         GDI_ReleaseObj( hdc );
 228     }
 229     else /* use StretchBlt */
 230     {
 231         HBITMAP hBitmap, hOldBitmap;
 232         HPALETTE hpal = NULL;
 233         HDC hdcMem;
 234         LONG height;
 235         LONG width;
 236         WORD planes, bpp;
 237         DWORD compr, size;
 238
 239         GDI_ReleaseObj( hdc );
 240
 241         if (DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &planes, &bpp, &compr, &size ) == -1)
 242         {
 243             ERR("Invalid bitmap\n");
 244             return 0;
 245         }
 246
 247         if (width < 0)
 248         {
 249             ERR("Bitmap has a negative width\n");
 250             return 0;
 251         }
 252
 253         hdcMem = CreateCompatibleDC( hdc );
 254         hBitmap = CreateCompatibleBitmap(hdc, width, height);
 255         hOldBitmap = SelectObject( hdcMem, hBitmap );
 256         if(wUsage == DIB_PAL_COLORS)
 257         {
 258             hpal = GetCurrentObject(hdc, OBJ_PAL);
 259             hpal = SelectPalette(hdcMem, hpal, FALSE);
 260         }
 261
 262         if (info->bmiHeader.biCompression == BI_RLE4 ||
 263             info->bmiHeader.biCompression == BI_RLE8) {
 264
 265            /* when RLE compression is used, there may be some gaps (ie the DIB doesn't
 266             * contain all the rectangle described in bmiHeader, but only part of it.
 267             * This mean that those undescribed pixels must be left untouched.
 268             * So, we first copy on a memory bitmap the current content of the
 269             * destination rectangle, blit the DIB bits on top of it - hence leaving
 270             * the gaps untouched -, and blitting the rectangle back.
 271             * This insure that gaps are untouched on the destination rectangle
 272             * Not doing so leads to trashed images (the gaps contain what was on the
 273             * memory bitmap => generally black or garbage)
 274             * Unfortunately, RLE DIBs without gaps will be slowed down. But this is
 275             * another speed vs correctness issue. Anyway, if speed is needed, then the
 276             * pStretchDIBits function shall be implemented.
 277             * ericP (2000/09/09)
 278             */
 279
 280             /* copy existing bitmap from destination dc */
 281             StretchBlt( hdcMem, xSrc, abs(height) - heightSrc - ySrc,
 282                         widthSrc, heightSrc, hdc, xDst, yDst, widthDst, heightDst,
 283                         dwRop );
 284         }
 285
 286         SetDIBits(hdcMem, hBitmap, 0, height, bits, info, wUsage);
 287
 288         /* Origin for DIBitmap may be bottom left (positive biHeight) or top
 289            left (negative biHeight) */
 290         StretchBlt( hdc, xDst, yDst, widthDst, heightDst,
 291                     hdcMem, xSrc, abs(height) - heightSrc - ySrc,
 292                     widthSrc, heightSrc, dwRop );
 293         if(hpal)
 294             SelectPalette(hdcMem, hpal, FALSE);
 295         SelectObject( hdcMem, hOldBitmap );
 296         DeleteDC( hdcMem );
 297         DeleteObject( hBitmap );
 298     }
 299     return heightSrc;
 300 }
 301
 302
 303 /******************************************************************************
 304  * SetDIBits [GDI32.@]
 305  *
 306  * Sets pixels in a bitmap using colors from DIB.
 307  *
 308  * PARAMS
 309  *    hdc       [I] Handle to device context
 310  *    hbitmap   [I] Handle to bitmap
 311  *    startscan [I] Starting scan line
 312  *    lines     [I] Number of scan lines
 313  *    bits      [I] Array of bitmap bits
 314  *    info      [I] Address of structure with data
 315  *    coloruse  [I] Type of color indexes to use
 316  *
 317  * RETURNS
 318  *    Success: Number of scan lines copied
 319  *    Failure: 0
 320  */
 321 INT WINAPI SetDIBits( HDC hdc, HBITMAP hbitmap, UINT startscan,
 322                       UINT lines, LPCVOID bits, const BITMAPINFO *info,
 323                       UINT coloruse )
 324 {
 325     DC *dc;
 326     BITMAPOBJ *bitmap;
 327     INT result = 0;
 328
 329     if (!(dc = DC_GetDCUpdate( hdc )))
 330     {
 331         if (coloruse == DIB_RGB_COLORS) FIXME( "shouldn't require a DC for DIB_RGB_COLORS\n" );
 332         return 0;
 333     }
 334
 335     if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
 336     {
 337         GDI_ReleaseObj( hdc );
 338         return 0;
 339     }
 340
 341     if (!bitmap->funcs && !BITMAP_SetOwnerDC( hbitmap, dc )) goto done;
 342
 343     if (bitmap->funcs && bitmap->funcs->pSetDIBits)
 344         result = bitmap->funcs->pSetDIBits( dc->physDev, hbitmap, startscan, lines,
 345                                             bits, info, coloruse );
 346     else
 347         result = lines;
 348
 349  done:
 350     GDI_ReleaseObj( hbitmap );
 351     GDI_ReleaseObj( hdc );
 352     return result;
 353 }
 354
 355
 356 /***********************************************************************
 357  *           SetDIBitsToDevice   (GDI32.@)
 358  */
 359 INT WINAPI SetDIBitsToDevice(HDC hdc, INT xDest, INT yDest, DWORD cx,
 360                            DWORD cy, INT xSrc, INT ySrc, UINT startscan,
 361                            UINT lines, LPCVOID bits, const BITMAPINFO *info,
 362                            UINT coloruse )
 363 {
 364     INT ret;
 365     DC *dc;
 366
 367     if (!(dc = DC_GetDCUpdate( hdc ))) return 0;
 368
 369     if(dc->funcs->pSetDIBitsToDevice)
 370         ret = dc->funcs->pSetDIBitsToDevice( dc->physDev, xDest, yDest, cx, cy, xSrc,
 371                                              ySrc, startscan, lines, bits,
 372                                              info, coloruse );
 373     else {
 374         FIXME("unimplemented on hdc %p\n", hdc);
 375         ret = 0;
 376     }
 377
 378     GDI_ReleaseObj( hdc );
 379     return ret;
 380 }
 381
 382 /***********************************************************************
 383  *           SetDIBColorTable    (GDI32.@)
 384  */
 385 UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, CONST RGBQUAD *colors )
 386 {
 387     DC * dc;
 388     UINT result = 0;
 389     BITMAPOBJ * bitmap;
 390
 391     if (!(dc = DC_GetDCPtr( hdc ))) return 0;
 392
 393     if ((bitmap = GDI_GetObjPtr( dc->hBitmap, BITMAP_MAGIC )))
 394     {
 395         /* Check if currently selected bitmap is a DIB */
 396         if (bitmap->color_table)
 397         {
 398             if (startpos < bitmap->nb_colors)
 399             {
 400                 if (startpos + entries > bitmap->nb_colors) entries = bitmap->nb_colors - startpos;
 401                 memcpy(bitmap->color_table + startpos, colors, entries * sizeof(RGBQUAD));
 402                 result = entries;
 403             }
 404         }
 405         GDI_ReleaseObj( dc->hBitmap );
 406     }
 407
 408     if (dc->funcs->pSetDIBColorTable)
 409         dc->funcs->pSetDIBColorTable(dc->physDev, startpos, entries, colors);
 410
 411     GDI_ReleaseObj( hdc );
 412     return result;
 413 }
 414
 415
 416 /***********************************************************************
 417  *           GetDIBColorTable    (GDI32.@)
 418  */
 419 UINT WINAPI GetDIBColorTable( HDC hdc, UINT startpos, UINT entries, RGBQUAD *colors )
 420 {
 421     DC * dc;
 422     UINT result = 0;
 423
 424     if (!(dc = DC_GetDCPtr( hdc ))) return 0;
 425
 426     if (dc->funcs->pGetDIBColorTable)
 427         result = dc->funcs->pGetDIBColorTable(dc->physDev, startpos, entries, colors);
 428     else
 429     {
 430         BITMAPOBJ *bitmap = GDI_GetObjPtr( dc->hBitmap, BITMAP_MAGIC );
 431         if (bitmap)
 432         {
 433             /* Check if currently selected bitmap is a DIB */
 434             if (bitmap->color_table)
 435             {
 436                 if (startpos < bitmap->nb_colors)
 437                 {
 438                     if (startpos + entries > bitmap->nb_colors) entries = bitmap->nb_colors - startpos;
 439                     memcpy(colors, bitmap->color_table + startpos, entries * sizeof(RGBQUAD));
 440                     result = entries;
 441                 }
 442             }
 443             GDI_ReleaseObj( dc->hBitmap );
 444         }
 445     }
 446     GDI_ReleaseObj( hdc );
 447     return result;
 448 }
 449
 450 /* FIXME the following two structs should be combined with __sysPalTemplate in
 451    objects/color.c - this should happen after de-X11-ing both of these
 452    files.
 453    NB. RGBQUAD and PALETTEENTRY have different orderings of red, green
 454    and blue - sigh */
 455
 456 static const RGBQUAD EGAColorsQuads[16] = {
 457 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
 458     { 0x00, 0x00, 0x00, 0x00 },
 459     { 0x00, 0x00, 0x80, 0x00 },
 460     { 0x00, 0x80, 0x00, 0x00 },
 461     { 0x00, 0x80, 0x80, 0x00 },
 462     { 0x80, 0x00, 0x00, 0x00 },
 463     { 0x80, 0x00, 0x80, 0x00 },
 464     { 0x80, 0x80, 0x00, 0x00 },
 465     { 0x80, 0x80, 0x80, 0x00 },
 466     { 0xc0, 0xc0, 0xc0, 0x00 },
 467     { 0x00, 0x00, 0xff, 0x00 },
 468     { 0x00, 0xff, 0x00, 0x00 },
 469     { 0x00, 0xff, 0xff, 0x00 },
 470     { 0xff, 0x00, 0x00, 0x00 },
 471     { 0xff, 0x00, 0xff, 0x00 },
 472     { 0xff, 0xff, 0x00, 0x00 },
 473     { 0xff, 0xff, 0xff, 0x00 }
 474 };
 475
 476 static const RGBTRIPLE EGAColorsTriples[16] = {
 477 /* rgbBlue, rgbGreen, rgbRed */
 478     { 0x00, 0x00, 0x00 },
 479     { 0x00, 0x00, 0x80 },
 480     { 0x00, 0x80, 0x00 },
 481     { 0x00, 0x80, 0x80 },
 482     { 0x80, 0x00, 0x00 },
 483     { 0x80, 0x00, 0x80 },
 484     { 0x80, 0x80, 0x00 },
 485     { 0x80, 0x80, 0x80 },
 486     { 0xc0, 0xc0, 0xc0 },
 487     { 0x00, 0x00, 0xff },
 488     { 0x00, 0xff, 0x00 },
 489     { 0x00, 0xff, 0xff },
 490     { 0xff, 0x00, 0x00 } ,
 491     { 0xff, 0x00, 0xff },
 492     { 0xff, 0xff, 0x00 },
 493     { 0xff, 0xff, 0xff }
 494 };
 495
 496 static const RGBQUAD DefLogPaletteQuads[20] = { /* Copy of Default Logical Palette */
 497 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
 498     { 0x00, 0x00, 0x00, 0x00 },
 499     { 0x00, 0x00, 0x80, 0x00 },
 500     { 0x00, 0x80, 0x00, 0x00 },
 501     { 0x00, 0x80, 0x80, 0x00 },
 502     { 0x80, 0x00, 0x00, 0x00 },
 503     { 0x80, 0x00, 0x80, 0x00 },
 504     { 0x80, 0x80, 0x00, 0x00 },
 505     { 0xc0, 0xc0, 0xc0, 0x00 },
 506     { 0xc0, 0xdc, 0xc0, 0x00 },
 507     { 0xf0, 0xca, 0xa6, 0x00 },
 508     { 0xf0, 0xfb, 0xff, 0x00 },
 509     { 0xa4, 0xa0, 0xa0, 0x00 },
 510     { 0x80, 0x80, 0x80, 0x00 },
 511     { 0x00, 0x00, 0xf0, 0x00 },
 512     { 0x00, 0xff, 0x00, 0x00 },
 513     { 0x00, 0xff, 0xff, 0x00 },
 514     { 0xff, 0x00, 0x00, 0x00 },
 515     { 0xff, 0x00, 0xff, 0x00 },
 516     { 0xff, 0xff, 0x00, 0x00 },
 517     { 0xff, 0xff, 0xff, 0x00 }
 518 };
 519
 520 static const RGBTRIPLE DefLogPaletteTriples[20] = { /* Copy of Default Logical Palette */
 521 /* rgbBlue, rgbGreen, rgbRed */
 522     { 0x00, 0x00, 0x00 },
 523     { 0x00, 0x00, 0x80 },
 524     { 0x00, 0x80, 0x00 },
 525     { 0x00, 0x80, 0x80 },
 526     { 0x80, 0x00, 0x00 },
 527     { 0x80, 0x00, 0x80 },
 528     { 0x80, 0x80, 0x00 },
 529     { 0xc0, 0xc0, 0xc0 },
 530     { 0xc0, 0xdc, 0xc0 },
 531     { 0xf0, 0xca, 0xa6 },
 532     { 0xf0, 0xfb, 0xff },
 533     { 0xa4, 0xa0, 0xa0 },
 534     { 0x80, 0x80, 0x80 },
 535     { 0x00, 0x00, 0xf0 },
 536     { 0x00, 0xff, 0x00 },
 537     { 0x00, 0xff, 0xff },
 538     { 0xff, 0x00, 0x00 },
 539     { 0xff, 0x00, 0xff },
 540     { 0xff, 0xff, 0x00 },
 541     { 0xff, 0xff, 0xff}
 542 };
 543
 544
 545 /******************************************************************************
 546  * GetDIBits [GDI32.@]
 547  *
 548  * Retrieves bits of bitmap and copies to buffer.
 549  *
 550  * RETURNS
 551  *    Success: Number of scan lines copied from bitmap
 552  *    Failure: 0
 553  *
 554  * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_87eb.asp
 555  */
 556 INT WINAPI GetDIBits(
 557     HDC hdc,         /* [in]  Handle to device context */
 558     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 559     UINT startscan,  /* [in]  First scan line to set in dest bitmap */
 560     UINT lines,      /* [in]  Number of scan lines to copy */
 561     LPVOID bits,       /* [out] Address of array for bitmap bits */
 562     BITMAPINFO * info, /* [out] Address of structure with bitmap data */
 563     UINT coloruse)   /* [in]  RGB or palette index */
 564 {
 565     DC * dc;
 566     BITMAPOBJ * bmp;
 567     int i;
 568     int bitmap_type;
 569     BOOL core_header;
 570     LONG width;
 571     LONG height;
 572     WORD planes, bpp;
 573     DWORD compr, size;
 574     void* colorPtr;
 575     RGBTRIPLE* rgbTriples;
 576     RGBQUAD* rgbQuads;
 577
 578     if (!info) return 0;
 579
 580     bitmap_type = DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &planes, &bpp, &compr, &size);
 581     if (bitmap_type == -1)
 582     {
 583         ERR("Invalid bitmap format\n");
 584         return 0;
 585     }
 586     core_header = (bitmap_type == 0);
 587     if (!(dc = DC_GetDCUpdate( hdc )))
 588     {
 589         SetLastError( ERROR_INVALID_PARAMETER );
 590         return 0;
 591     }
 592     if (!(bmp = (BITMAPOBJ *)GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
 593     {
 594         GDI_ReleaseObj( hdc );
 595         return 0;
 596     }
 597
 598     colorPtr = (LPBYTE) info + (WORD) info->bmiHeader.biSize;
 599     rgbTriples = (RGBTRIPLE *) colorPtr;
 600     rgbQuads = (RGBQUAD *) colorPtr;
 601
 602     /* Transfer color info */
 603
 604     if (bpp <= 8 && bpp > 0)
 605     {
 606         if (!core_header) info->bmiHeader.biClrUsed = 0;
 607
 608         /* If the bitmap object already has a dib section at the
 609            same color depth then get the color map from it */
 610         if (bmp->dib && bmp->dib->dsBm.bmBitsPixel == bpp) {
 611             if(coloruse == DIB_RGB_COLORS) {
 612                 unsigned int colors = min( bmp->nb_colors, 1 << bpp );
 613
 614                 if (core_header)
 615                 {
 616                     /* Convert the color table (RGBQUAD to RGBTRIPLE) */
 617                     RGBTRIPLE* index = rgbTriples;
 618
 619                     for (i=0; i < colors; i++, index++)
 620                     {
 621                         index->rgbtRed   = bmp->color_table[i].rgbRed;
 622                         index->rgbtGreen = bmp->color_table[i].rgbGreen;
 623                         index->rgbtBlue  = bmp->color_table[i].rgbBlue;
 624                     }
 625                 }
 626                 else
 627                 {
 628                     if (colors != 1 << bpp) info->bmiHeader.biClrUsed = colors;
 629                     memcpy(colorPtr, bmp->color_table, colors * sizeof(RGBQUAD));
 630                 }
 631             }
 632             else {
 633                 WORD *index = colorPtr;
 634                 for(i = 0; i < 1 << info->bmiHeader.biBitCount; i++, index++)
 635                     *index = i;
 636             }
 637         }
 638         else {
 639             if(bpp >= bmp->bitmap.bmBitsPixel) {
 640                 /* Generate the color map from the selected palette */
 641                 PALETTEENTRY palEntry[256];
 642
 643                 memset( palEntry, 0, sizeof(palEntry) );
 644                 if (!GetPaletteEntries( dc->hPalette, 0, 1 << bmp->bitmap.bmBitsPixel, palEntry ))
 645                 {
 646                     GDI_ReleaseObj( hdc );
 647                     GDI_ReleaseObj( hbitmap );
 648                     return 0;
 649                 }
 650                 for (i = 0; i < (1 << bmp->bitmap.bmBitsPixel); i++) {
 651                     if (coloruse == DIB_RGB_COLORS) {
 652                         if (core_header)
 653                         {
 654                             rgbTriples[i].rgbtRed   = palEntry[i].peRed;
 655                             rgbTriples[i].rgbtGreen = palEntry[i].peGreen;
 656                             rgbTriples[i].rgbtBlue  = palEntry[i].peBlue;
 657                         }
 658                         else
 659                         {
 660                             rgbQuads[i].rgbRed      = palEntry[i].peRed;
 661                             rgbQuads[i].rgbGreen    = palEntry[i].peGreen;
 662                             rgbQuads[i].rgbBlue     = palEntry[i].peBlue;
 663                             rgbQuads[i].rgbReserved = 0;
 664                         }
 665                     }
 666                     else ((WORD *)colorPtr)[i] = (WORD)i;
 667                 }
 668             } else {
 669                 switch (bpp) {
 670                 case 1:
 671                     if (core_header)
 672                     {
 673                         rgbTriples[0].rgbtRed = rgbTriples[0].rgbtGreen =
 674                             rgbTriples[0].rgbtBlue = 0;
 675                         rgbTriples[1].rgbtRed = rgbTriples[1].rgbtGreen =
 676                             rgbTriples[1].rgbtBlue = 0xff;
 677                     }
 678                     else
 679                     {
 680                         rgbQuads[0].rgbRed = rgbQuads[0].rgbGreen =
 681                             rgbQuads[0].rgbBlue = 0;
 682                         rgbQuads[0].rgbReserved = 0;
 683                         rgbQuads[1].rgbRed = rgbQuads[1].rgbGreen =
 684                             rgbQuads[1].rgbBlue = 0xff;
 685                         rgbQuads[1].rgbReserved = 0;
 686                     }
 687                     break;
 688
 689                 case 4:
 690                     if (core_header)
 691                         memcpy(colorPtr, EGAColorsTriples, sizeof(EGAColorsTriples));
 692                     else
 693                         memcpy(colorPtr, EGAColorsQuads, sizeof(EGAColorsQuads));
 694
 695                     break;
 696
 697                 case 8:
 698                     {
 699                         if (core_header)
 700                         {
 701                             INT r, g, b;
 702                             RGBTRIPLE *color;
 703
 704                             memcpy(rgbTriples, DefLogPaletteTriples,
 705                                        10 * sizeof(RGBTRIPLE));
 706                             memcpy(rgbTriples + 246, DefLogPaletteTriples + 10,
 707                                        10 * sizeof(RGBTRIPLE));
 708                             color = rgbTriples + 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->rgbtRed =   (r * 0xff) / 5;
 713                                         color->rgbtGreen = (g * 0xff) / 5;
 714                                         color->rgbtBlue =  (b * 0xff) / 5;
 715                                         color++;
 716                                     }
 717                         }
 718                         else
 719                         {
 720                             INT r, g, b;
 721                             RGBQUAD *color;
 722
 723                             memcpy(rgbQuads, DefLogPaletteQuads,
 724                                        10 * sizeof(RGBQUAD));
 725                             memcpy(rgbQuads + 246, DefLogPaletteQuads + 10,
 726                                    10 * sizeof(RGBQUAD));
 727                             color = rgbQuads + 10;
 728                             for(r = 0; r <= 5; r++) /* FIXME */
 729                                 for(g = 0; g <= 5; g++)
 730                                     for(b = 0; b <= 5; b++) {
 731                                         color->rgbRed =   (r * 0xff) / 5;
 732                                         color->rgbGreen = (g * 0xff) / 5;
 733                                         color->rgbBlue =  (b * 0xff) / 5;
 734                                         color->rgbReserved = 0;
 735                                         color++;
 736                                     }
 737                         }
 738                     }
 739                 }
 740             }
 741         }
 742     }
 743
 744     if (bits && lines)
 745     {
 746         /* If the bitmap object already have a dib section that contains image data, get the bits from it */
 747         if(bmp->dib && bmp->dib->dsBm.bmBitsPixel >= 15 && bpp >= 15)
 748         {
 749             /*FIXME: Only RGB dibs supported for now */
 750             unsigned int srcwidth = bmp->dib->dsBm.bmWidth, srcwidthb = bmp->dib->dsBm.bmWidthBytes;
 751             unsigned int dstwidth = width;
 752             int dstwidthb = DIB_GetDIBWidthBytes( width, bpp );
 753             LPBYTE dbits = bits, sbits = (LPBYTE) bmp->dib->dsBm.bmBits + (startscan * srcwidthb);
 754             unsigned int x, y, width, widthb;
 755
 756             if ((height < 0) ^ (bmp->dib->dsBmih.biHeight < 0))
 757             {
 758                 dbits = (LPBYTE)bits + (dstwidthb * (lines-1));
 759                 dstwidthb = -dstwidthb;
 760             }
 761
 762             switch( bpp ) {
 763
 764             case 15:
 765             case 16: /* 16 bpp dstDIB */
 766                 {
 767                     LPWORD dstbits = (LPWORD)dbits;
 768                     WORD rmask = 0x7c00, gmask= 0x03e0, bmask = 0x001f;
 769
 770                     /* FIXME: BI_BITFIELDS not supported yet */
 771
 772                     switch(bmp->dib->dsBm.bmBitsPixel) {
 773
 774                     case 16: /* 16 bpp srcDIB -> 16 bpp dstDIB */
 775                         {
 776                             widthb = min(srcwidthb, abs(dstwidthb));
 777                             /* FIXME: BI_BITFIELDS not supported yet */
 778                             for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb)
 779                                 memcpy(dbits, sbits, widthb);
 780                         }
 781                         break;
 782
 783                     case 24: /* 24 bpp srcDIB -> 16 bpp dstDIB */
 784                         {
 785                             LPBYTE srcbits = sbits;
 786
 787                             width = min(srcwidth, dstwidth);
 788                             for( y = 0; y < lines; y++) {
 789                                 for( x = 0; x < width; x++, srcbits += 3)
 790                                     *dstbits++ = ((srcbits[0] >> 3) & bmask) |
 791                                                  (((WORD)srcbits[1] << 2) & gmask) |
 792                                                  (((WORD)srcbits[2] << 7) & rmask);
 793
 794                                 dstbits = (LPWORD)(dbits+=dstwidthb);
 795                                 srcbits = (sbits += srcwidthb);
 796                             }
 797                         }
 798                         break;
 799
 800                     case 32: /* 32 bpp srcDIB -> 16 bpp dstDIB */
 801                         {
 802                             LPDWORD srcbits = (LPDWORD)sbits;
 803                             DWORD val;
 804
 805                             width = min(srcwidth, dstwidth);
 806                             for( y = 0; y < lines; y++) {
 807                                 for( x = 0; x < width; x++ ) {
 808                                     val = *srcbits++;
 809                                     *dstbits++ = (WORD)(((val >> 3) & bmask) | ((val >> 6) & gmask) |
 810                                                        ((val >> 9) & rmask));
 811                                 }
 812                                 dstbits = (LPWORD)(dbits+=dstwidthb);
 813                                 srcbits = (LPDWORD)(sbits+=srcwidthb);
 814                             }
 815                         }
 816                         break;
 817
 818                     default: /* ? bit bmp -> 16 bit DIB */
 819                         FIXME("15/16 bit DIB %d bit bitmap\n",
 820                         bmp->bitmap.bmBitsPixel);
 821                         break;
 822                     }
 823                 }
 824                 break;
 825
 826             case 24: /* 24 bpp dstDIB */
 827                 {
 828                     LPBYTE dstbits = dbits;
 829
 830                     switch(bmp->dib->dsBm.bmBitsPixel) {
 831
 832                     case 16: /* 16 bpp srcDIB -> 24 bpp dstDIB */
 833                         {
 834                             LPWORD srcbits = (LPWORD)sbits;
 835                             WORD val;
 836
 837                             width = min(srcwidth, dstwidth);
 838                             /* FIXME: BI_BITFIELDS not supported yet */
 839                             for( y = 0; y < lines; y++) {
 840                                 for( x = 0; x < width; x++ ) {
 841                                     val = *srcbits++;
 842                                     *dstbits++ = (BYTE)(((val << 3) & 0xf8) | ((val >> 2) & 0x07));
 843                                     *dstbits++ = (BYTE)(((val >> 2) & 0xf8) | ((val >> 7) & 0x07));
 844                                     *dstbits++ = (BYTE)(((val >> 7) & 0xf8) | ((val >> 12) & 0x07));
 845                                 }
 846                                 dstbits = (LPBYTE)(dbits+=dstwidthb);
 847                                 srcbits = (LPWORD)(sbits+=srcwidthb);
 848                             }
 849                         }
 850                         break;
 851
 852                     case 24: /* 24 bpp srcDIB -> 24 bpp dstDIB */
 853                         {
 854                             widthb = min(srcwidthb, abs(dstwidthb));
 855                             for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb)
 856                                 memcpy(dbits, sbits, widthb);
 857                         }
 858                         break;
 859
 860                     case 32: /* 32 bpp srcDIB -> 24 bpp dstDIB */
 861                         {
 862                             LPBYTE srcbits = (LPBYTE)sbits;
 863
 864                             width = min(srcwidth, dstwidth);
 865                             for( y = 0; y < lines; y++) {
 866                                 for( x = 0; x < width; x++, srcbits++ ) {
 867                                     *dstbits++ = *srcbits++;
 868                                     *dstbits++ = *srcbits++;
 869                                     *dstbits++ = *srcbits++;
 870                                 }
 871                                 dstbits=(LPBYTE)(dbits+=dstwidthb);
 872                                 srcbits = (LPBYTE)(sbits+=srcwidthb);
 873                             }
 874                         }
 875                         break;
 876
 877                     default: /* ? bit bmp -> 24 bit DIB */
 878                         FIXME("24 bit DIB %d bit bitmap\n",
 879                               bmp->bitmap.bmBitsPixel);
 880                         break;
 881                     }
 882                 }
 883                 break;
 884
 885             case 32: /* 32 bpp dstDIB */
 886                 {
 887                     LPDWORD dstbits = (LPDWORD)dbits;
 888
 889                     /* FIXME: BI_BITFIELDS not supported yet */
 890
 891                     switch(bmp->dib->dsBm.bmBitsPixel) {
 892                         case 16: /* 16 bpp srcDIB -> 32 bpp dstDIB */
 893                         {
 894                             LPWORD srcbits = (LPWORD)sbits;
 895                             DWORD val;
 896
 897                             width = min(srcwidth, dstwidth);
 898                             /* FIXME: BI_BITFIELDS not supported yet */
 899                             for( y = 0; y < lines; y++) {
 900                                 for( x = 0; x < width; x++ ) {
 901                                     val = (DWORD)*srcbits++;
 902                                     *dstbits++ = ((val << 3) & 0xf8) | ((val >> 2) & 0x07) |
 903                                                  ((val << 6) & 0xf800) | ((val << 1) & 0x0700) |
 904                                                  ((val << 9) & 0xf80000) | ((val << 4) & 0x070000);
 905                                 }
 906                                 dstbits=(LPDWORD)(dbits+=dstwidthb);
 907                                 srcbits=(LPWORD)(sbits+=srcwidthb);
 908                             }
 909                         }
 910                         break;
 911
 912                     case 24: /* 24 bpp srcDIB -> 32 bpp dstDIB */
 913                         {
 914                             LPBYTE srcbits = sbits;
 915
 916                             width = min(srcwidth, dstwidth);
 917                             for( y = 0; y < lines; y++) {
 918                                 for( x = 0; x < width; x++, srcbits+=3 )
 919                                     *dstbits++ =  srcbits[0] |
 920                                                  (srcbits[1] <<  8) |
 921                                                  (srcbits[2] << 16);
 922                                 dstbits=(LPDWORD)(dbits+=dstwidthb);
 923                                 srcbits=(sbits+=srcwidthb);
 924                             }
 925                         }
 926                         break;
 927
 928                     case 32: /* 32 bpp srcDIB -> 32 bpp dstDIB */
 929                         {
 930                             widthb = min(srcwidthb, abs(dstwidthb));
 931                             /* FIXME: BI_BITFIELDS not supported yet */
 932                             for (y = 0; y < lines; y++, dbits+=dstwidthb, sbits+=srcwidthb) {
 933                                 memcpy(dbits, sbits, widthb);
 934                             }
 935                         }
 936                         break;
 937
 938                     default: /* ? bit bmp -> 32 bit DIB */
 939                         FIXME("32 bit DIB %d bit bitmap\n",
 940                         bmp->bitmap.bmBitsPixel);
 941                         break;
 942                     }
 943                 }
 944                 break;
 945
 946             default: /* ? bit DIB */
 947                 FIXME("Unsupported DIB depth %d\n", info->bmiHeader.biBitCount);
 948                 break;
 949             }
 950         }
 951         /* Otherwise, get bits from the XImage */
 952         else
 953         {
 954             if (!bmp->funcs && !BITMAP_SetOwnerDC( hbitmap, dc )) lines = 0;
 955             else
 956             {
 957                 if (bmp->funcs && bmp->funcs->pGetDIBits)
 958                     lines = bmp->funcs->pGetDIBits( dc->physDev, hbitmap, startscan,
 959                                                     lines, bits, info, coloruse );
 960                 else
 961                     lines = 0;  /* FIXME: should copy from bmp->bitmap.bmBits */
 962             }
 963         }
 964     }
 965     else
 966     {
 967         /* fill in struct members */
 968
 969         if (bpp == 0)
 970         {
 971             if (core_header)
 972             {
 973                 BITMAPCOREHEADER* coreheader = (BITMAPCOREHEADER*) info;
 974                 coreheader->bcWidth = bmp->bitmap.bmWidth;
 975                 coreheader->bcHeight = bmp->bitmap.bmHeight;
 976                 coreheader->bcPlanes = 1;
 977                 coreheader->bcBitCount = bmp->bitmap.bmBitsPixel;
 978             }
 979             else
 980             {
 981                 info->bmiHeader.biWidth = bmp->bitmap.bmWidth;
 982                 info->bmiHeader.biHeight = bmp->bitmap.bmHeight;
 983                 info->bmiHeader.biPlanes = 1;
 984                 info->bmiHeader.biSizeImage =
 985                                  DIB_GetDIBImageBytes( bmp->bitmap.bmWidth,
 986                                                        bmp->bitmap.bmHeight,
 987                                                        bmp->bitmap.bmBitsPixel );
 988                 switch(bmp->bitmap.bmBitsPixel)
 989                 {
 990                 case 15:
 991                     info->bmiHeader.biBitCount = 16;
 992                     info->bmiHeader.biCompression = BI_RGB;
 993                     break;
 994
 995                 case 16:
 996                     info->bmiHeader.biBitCount = 16;
 997                     info->bmiHeader.biCompression = BI_BITFIELDS;
 998                     ((PDWORD)info->bmiColors)[0] = 0xf800;
 999                     ((PDWORD)info->bmiColors)[1] = 0x07e0;
1000                     ((PDWORD)info->bmiColors)[2] = 0x001f;
1001                     break;
1002
1003                 default:
1004                     info->bmiHeader.biBitCount = bmp->bitmap.bmBitsPixel;
1005                     info->bmiHeader.biCompression = BI_RGB;
1006                     break;
1007                 }
1008                 info->bmiHeader.biXPelsPerMeter = 0;
1009                 info->bmiHeader.biYPelsPerMeter = 0;
1010                 info->bmiHeader.biClrUsed = 0;
1011                 info->bmiHeader.biClrImportant = 0;
1012
1013                 /* Windows 2000 doesn't touch the additional struct members if
1014                    it's a BITMAPV4HEADER or a BITMAPV5HEADER */
1015             }
1016             lines = abs(bmp->bitmap.bmHeight);
1017         }
1018         else
1019         {
1020             /* The knowledge base article Q81498 ("DIBs and Their Uses") states that
1021                if bits == NULL and bpp != 0, only biSizeImage and the color table are
1022                filled in. */
1023             if (!core_header)
1024             {
1025                 /* FIXME: biSizeImage should be calculated according to the selected
1026                           compression algorithm if biCompression != BI_RGB */
1027                 info->bmiHeader.biSizeImage = DIB_GetDIBImageBytes( width, height, bpp );
1028             }
1029             lines = abs(height);
1030         }
1031     }
1032
1033     if (!core_header)
1034     {
1035         TRACE("biSizeImage = %d, ", info->bmiHeader.biSizeImage);
1036     }
1037     TRACE("biWidth = %d, biHeight = %d\n", width, height);
1038
1039     GDI_ReleaseObj( hdc );
1040     GDI_ReleaseObj( hbitmap );
1041     return lines;
1042 }
1043
1044
1045 /***********************************************************************
1046  *           CreateDIBitmap    (GDI32.@)
1047  *
1048  * Creates a DDB (device dependent bitmap) from a DIB.
1049  * The DDB will have the same color depth as the reference DC.
1050  */
1051 HBITMAP WINAPI CreateDIBitmap( HDC hdc, const BITMAPINFOHEADER *header,
1052                             DWORD init, LPCVOID bits, const BITMAPINFO *data,
1053                             UINT coloruse )
1054 {
1055     HBITMAP handle;
1056     LONG width;
1057     LONG height;
1058     WORD planes, bpp;
1059     DWORD compr, size;
1060     DC *dc;
1061
1062     if (DIB_GetBitmapInfo( header, &width, &height, &planes, &bpp, &compr, &size ) == -1) return 0;
1063
1064     if (width < 0)
1065     {
1066         TRACE("Bitmap has a negative width\n");
1067         return 0;
1068     }
1069
1070     /* Top-down DIBs have a negative height */
1071     if (height < 0) height = -height;
1072
1073     TRACE("hdc=%p, header=%p, init=%u, bits=%p, data=%p, coloruse=%u (bitmap: width=%d, height=%d, bpp=%u, compr=%u)\n",
1074            hdc, header, init, bits, data, coloruse, width, height, bpp, compr);
1075
1076     if (hdc == NULL)
1077         handle = CreateBitmap( width, height, 1, 1, NULL );
1078     else
1079         handle = CreateCompatibleBitmap( hdc, width, height );
1080
1081     if (handle)
1082     {
1083         if (init == CBM_INIT) SetDIBits( hdc, handle, 0, height, bits, data, coloruse );
1084
1085         else if (hdc && ((dc = DC_GetDCPtr( hdc )) != NULL) )
1086         {
1087             if (!BITMAP_SetOwnerDC( handle, dc ))
1088             {
1089                 DeleteObject( handle );
1090                 handle = 0;
1091             }
1092             GDI_ReleaseObj( hdc );
1093         }
1094     }
1095
1096     return handle;
1097 }
1098
1099 /***********************************************************************
1100  *           CreateDIBSection    (GDI.489)
1101  */
1102 HBITMAP16 WINAPI CreateDIBSection16 (HDC16 hdc, const BITMAPINFO *bmi, UINT16 usage,
1103                                      SEGPTR *bits16, HANDLE section, DWORD offset)
1104 {
1105     LPVOID bits32;
1106     HBITMAP hbitmap;
1107
1108     hbitmap = CreateDIBSection( HDC_32(hdc), bmi, usage, &bits32, section, offset );
1109     if (hbitmap)
1110     {
1111         BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr(hbitmap, BITMAP_MAGIC);
1112         if (bmp && bmp->dib && bits32)
1113         {
1114             const BITMAPINFOHEADER *bi = &bmi->bmiHeader;
1115             LONG width, height;
1116             WORD planes, bpp;
1117             DWORD compr, size;
1118             INT width_bytes;
1119             WORD count, sel;
1120             int i;
1121
1122             DIB_GetBitmapInfo(bi, &width, &height, &planes, &bpp, &compr, &size);
1123
1124             height = height >= 0 ? height : -height;
1125             width_bytes = DIB_GetDIBWidthBytes(width, bpp);
1126
1127             if (!size || (compr != BI_RLE4 && compr != BI_RLE8)) size = width_bytes * height;
1128
1129             /* calculate number of sel's needed for size with 64K steps */
1130             count = (size + 0xffff) / 0x10000;
1131             sel = AllocSelectorArray16(count);
1132
1133             for (i = 0; i < count; i++)
1134             {
1135                 SetSelectorBase(sel + (i << __AHSHIFT), (DWORD)bits32 + i * 0x10000);
1136                 SetSelectorLimit16(sel + (i << __AHSHIFT), size - 1); /* yep, limit is correct */
1137                 size -= 0x10000;
1138             }
1139             bmp->segptr_bits = MAKESEGPTR( sel, 0 );
1140             if (bits16) *bits16 = bmp->segptr_bits;
1141         }
1142         if (bmp) GDI_ReleaseObj( hbitmap );
1143     }
1144     return HBITMAP_16(hbitmap);
1145 }
1146
1147 /* Copy/synthetize RGB palette from BITMAPINFO. Ripped from dlls/winex11.drv/dib.c */
1148 static void DIB_CopyColorTable( DC *dc, BITMAPOBJ *bmp, WORD coloruse, const BITMAPINFO *info )
1149 {
1150     RGBQUAD *colorTable;
1151     unsigned int colors;
1152     int i;
1153     BOOL core_info = info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER);
1154
1155     if (core_info)
1156     {
1157         colors = 1 << ((const BITMAPCOREINFO*) info)->bmciHeader.bcBitCount;
1158     }
1159     else
1160     {
1161         colors = info->bmiHeader.biClrUsed;
1162         if (!colors) colors = 1 << info->bmiHeader.biBitCount;
1163     }
1164
1165     if (colors > 256) {
1166         ERR("called with >256 colors!\n");
1167         return;
1168     }
1169
1170     if (!(colorTable = HeapAlloc(GetProcessHeap(), 0, colors * sizeof(RGBQUAD) ))) return;
1171
1172     if(coloruse == DIB_RGB_COLORS)
1173     {
1174         if (core_info)
1175         {
1176            /* Convert RGBTRIPLEs to RGBQUADs */
1177            for (i=0; i < colors; i++)
1178            {
1179                colorTable[i].rgbRed   = ((const BITMAPCOREINFO*) info)->bmciColors[i].rgbtRed;
1180                colorTable[i].rgbGreen = ((const BITMAPCOREINFO*) info)->bmciColors[i].rgbtGreen;
1181                colorTable[i].rgbBlue  = ((const BITMAPCOREINFO*) info)->bmciColors[i].rgbtBlue;
1182                colorTable[i].rgbReserved = 0;
1183            }
1184         }
1185         else
1186         {
1187             memcpy(colorTable, (const BYTE*) info + (WORD) info->bmiHeader.biSize, colors * sizeof(RGBQUAD));
1188         }
1189     }
1190     else
1191     {
1192         PALETTEENTRY entries[256];
1193         const WORD *index = (const WORD*) ((const BYTE*) info + (WORD) info->bmiHeader.biSize);
1194         UINT count = GetPaletteEntries( dc->hPalette, 0, colors, entries );
1195
1196         for (i = 0; i < colors; i++, index++)
1197         {
1198             PALETTEENTRY *entry = &entries[*index % count];
1199             colorTable[i].rgbRed = entry->peRed;
1200             colorTable[i].rgbGreen = entry->peGreen;
1201             colorTable[i].rgbBlue = entry->peBlue;
1202             colorTable[i].rgbReserved = 0;
1203         }
1204     }
1205     bmp->color_table = colorTable;
1206     bmp->nb_colors = colors;
1207 }
1208
1209 /***********************************************************************
1210  *           CreateDIBSection    (GDI32.@)
1211  */
1212 HBITMAP WINAPI CreateDIBSection(HDC hdc, CONST BITMAPINFO *bmi, UINT usage,
1213                                 VOID **bits, HANDLE section, DWORD offset)
1214 {
1215     HBITMAP ret = 0;
1216     DC *dc;
1217     BOOL bDesktopDC = FALSE;
1218     DIBSECTION *dib;
1219     BITMAPOBJ *bmp;
1220     int bitmap_type;
1221     LONG width, height;
1222     WORD planes, bpp;
1223     DWORD compression, sizeImage;
1224     void *mapBits = NULL;
1225
1226     if (((bitmap_type = DIB_GetBitmapInfo( &bmi->bmiHeader, &width, &height,
1227                                            &planes, &bpp, &compression, &sizeImage )) == -1))
1228         return 0;
1229
1230     if (compression != BI_RGB && compression != BI_BITFIELDS)
1231     {
1232         TRACE("can't create a compressed (%u) dibsection\n", compression);
1233         return 0;
1234     }
1235
1236     if (!(dib = HeapAlloc( GetProcessHeap(), 0, sizeof(*dib) ))) return 0;
1237
1238     TRACE("format (%d,%d), planes %d, bpp %d, size %d, %s\n",
1239           width, height, planes, bpp, sizeImage, usage == DIB_PAL_COLORS? "PAL" : "RGB");
1240
1241     dib->dsBm.bmType       = 0;
1242     dib->dsBm.bmWidth      = width;
1243     dib->dsBm.bmHeight     = height >= 0 ? height : -height;
1244     dib->dsBm.bmWidthBytes = DIB_GetDIBWidthBytes(width, bpp);
1245     dib->dsBm.bmPlanes     = planes;
1246     dib->dsBm.bmBitsPixel  = bpp;
1247     dib->dsBm.bmBits       = NULL;
1248
1249     if (!bitmap_type)  /* core header */
1250     {
1251         /* convert the BITMAPCOREHEADER to a BITMAPINFOHEADER */
1252         dib->dsBmih.biSize = sizeof(BITMAPINFOHEADER);
1253         dib->dsBmih.biWidth = width;
1254         dib->dsBmih.biHeight = height;
1255         dib->dsBmih.biPlanes = planes;
1256         dib->dsBmih.biBitCount = bpp;
1257         dib->dsBmih.biCompression = compression;
1258         dib->dsBmih.biXPelsPerMeter = 0;
1259         dib->dsBmih.biYPelsPerMeter = 0;
1260         dib->dsBmih.biClrUsed = 0;
1261         dib->dsBmih.biClrImportant = 0;
1262     }
1263     else
1264     {
1265         /* truncate extended bitmap headers (BITMAPV4HEADER etc.) */
1266         dib->dsBmih = bmi->bmiHeader;
1267         dib->dsBmih.biSize = sizeof(BITMAPINFOHEADER);
1268     }
1269
1270     /* set number of entries in bmi.bmiColors table */
1271     if( bpp <= 8 )
1272         dib->dsBmih.biClrUsed = 1 << bpp;
1273
1274     dib->dsBmih.biSizeImage = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
1275
1276     /* set dsBitfields values */
1277     if (usage == DIB_PAL_COLORS || bpp <= 8)
1278     {
1279         dib->dsBitfields[0] = dib->dsBitfields[1] = dib->dsBitfields[2] = 0;
1280     }
1281     else switch( bpp )
1282     {
1283     case 15:
1284     case 16:
1285         dib->dsBitfields[0] = (compression == BI_BITFIELDS) ? *(const DWORD *)bmi->bmiColors       : 0x7c00;
1286         dib->dsBitfields[1] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 1) : 0x03e0;
1287         dib->dsBitfields[2] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 2) : 0x001f;
1288         break;
1289     case 24:
1290     case 32:
1291         dib->dsBitfields[0] = (compression == BI_BITFIELDS) ? *(const DWORD *)bmi->bmiColors       : 0xff0000;
1292         dib->dsBitfields[1] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 1) : 0x00ff00;
1293         dib->dsBitfields[2] = (compression == BI_BITFIELDS) ? *((const DWORD *)bmi->bmiColors + 2) : 0x0000ff;
1294         break;
1295     }
1296
1297     /* get storage location for DIB bits */
1298
1299     if (section)
1300     {
1301         SYSTEM_INFO SystemInfo;
1302         DWORD mapOffset;
1303         INT mapSize;
1304
1305         GetSystemInfo( &SystemInfo );
1306         mapOffset = offset - (offset % SystemInfo.dwAllocationGranularity);
1307         mapSize = dib->dsBmih.biSizeImage + (offset - mapOffset);
1308         mapBits = MapViewOfFile( section, FILE_MAP_ALL_ACCESS, 0, mapOffset, mapSize );
1309         if (mapBits) dib->dsBm.bmBits = (char *)mapBits + (offset - mapOffset);
1310     }
1311     else
1312     {
1313         offset = 0;
1314         dib->dsBm.bmBits = VirtualAlloc( NULL, dib->dsBmih.biSizeImage,
1315                                          MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE );
1316     }
1317     dib->dshSection = section;
1318     dib->dsOffset = offset;
1319
1320     if (!dib->dsBm.bmBits)
1321     {
1322         HeapFree( GetProcessHeap(), 0, dib );
1323         return 0;
1324     }
1325
1326     /* If the reference hdc is null, take the desktop dc */
1327     if (hdc == 0)
1328     {
1329         hdc = CreateCompatibleDC(0);
1330         bDesktopDC = TRUE;
1331     }
1332
1333     if (!(dc = DC_GetDCPtr( hdc ))) goto error;
1334
1335     /* create Device Dependent Bitmap and add DIB pointer */
1336     ret = CreateBitmap( dib->dsBm.bmWidth, dib->dsBm.bmHeight, 1,
1337                         (bpp == 1) ? 1 : GetDeviceCaps(hdc, BITSPIXEL), NULL );
1338
1339     if (ret && ((bmp = GDI_GetObjPtr(ret, BITMAP_MAGIC))))
1340     {
1341         bmp->dib = dib;
1342         bmp->funcs = dc->funcs;
1343         /* create local copy of DIB palette */
1344         if (bpp <= 8) DIB_CopyColorTable( dc, bmp, usage, bmi );
1345         GDI_ReleaseObj( ret );
1346
1347         if (dc->funcs->pCreateDIBSection)
1348         {
1349             if (!dc->funcs->pCreateDIBSection(dc->physDev, ret, bmi, usage))
1350             {
1351                 DeleteObject( ret );
1352                 ret = 0;
1353             }
1354         }
1355     }
1356
1357     GDI_ReleaseObj(hdc);
1358     if (bDesktopDC) DeleteDC( hdc );
1359     if (ret && bits) *bits = dib->dsBm.bmBits;
1360     return ret;
1361
1362 error:
1363     if (bDesktopDC) DeleteDC( hdc );
1364     if (section) UnmapViewOfFile( mapBits );
1365     else if (!offset) VirtualFree( dib->dsBm.bmBits, 0, MEM_RELEASE );
1366     HeapFree( GetProcessHeap(), 0, dib );
1367     return 0;
1368 }