dlls/gdi32/bitmap.c

   1 /*
   2  * GDI bitmap objects
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  *           1998 Huw D M Davies
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "wine/winbase16.h"
  30 #include "gdi_private.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(bitmap);
  34
  35
  36 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, HDC hdc );
  37 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer );
  38 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj );
  39
  40 static const struct gdi_obj_funcs bitmap_funcs =
  41 {
  42     BITMAP_SelectObject,  /* pSelectObject */
  43     BITMAP_GetObject,     /* pGetObjectA */
  44     BITMAP_GetObject,     /* pGetObjectW */
  45     NULL,                 /* pUnrealizeObject */
  46     BITMAP_DeleteObject   /* pDeleteObject */
  47 };
  48
  49 /***********************************************************************
  50  *           BITMAP_GetWidthBytes
  51  *
  52  * Return number of bytes taken by a scanline of 16-bit aligned Windows DDB
  53  * data.
  54  */
  55 INT BITMAP_GetWidthBytes( INT bmWidth, INT bpp )
  56 {
  57     switch(bpp)
  58     {
  59     case 1:
  60         return 2 * ((bmWidth+15) >> 4);
  61
  62     case 24:
  63         bmWidth *= 3; /* fall through */
  64     case 8:
  65         return bmWidth + (bmWidth & 1);
  66
  67     case 32:
  68         return bmWidth * 4;
  69
  70     case 16:
  71     case 15:
  72         return bmWidth * 2;
  73
  74     case 4:
  75         return 2 * ((bmWidth+3) >> 2);
  76
  77     default:
  78         WARN("Unknown depth %d, please report.\n", bpp );
  79     }
  80     return -1;
  81 }
  82
  83
  84 /******************************************************************************
  85  * CreateBitmap [GDI32.@]
  86  *
  87  * Creates a bitmap with the specified info.
  88  *
  89  * PARAMS
  90  *    width  [I] bitmap width
  91  *    height [I] bitmap height
  92  *    planes [I] Number of color planes
  93  *    bpp    [I] Number of bits to identify a color
  94  *    bits   [I] Pointer to array containing color data
  95  *
  96  * RETURNS
  97  *    Success: Handle to bitmap
  98  *    Failure: 0
  99  */
 100 HBITMAP WINAPI CreateBitmap( INT width, INT height, UINT planes,
 101                              UINT bpp, LPCVOID bits )
 102 {
 103     BITMAP bm;
 104
 105     bm.bmType = 0;
 106     bm.bmWidth = width;
 107     bm.bmHeight = height;
 108     bm.bmWidthBytes = BITMAP_GetWidthBytes( width, bpp );
 109     bm.bmPlanes = planes;
 110     bm.bmBitsPixel = bpp;
 111     bm.bmBits = (LPVOID)bits;
 112
 113     return CreateBitmapIndirect( &bm );
 114 }
 115
 116 /******************************************************************************
 117  * CreateCompatibleBitmap [GDI32.@]
 118  *
 119  * Creates a bitmap compatible with the DC.
 120  *
 121  * PARAMS
 122  *    hdc    [I] Handle to device context
 123  *    width  [I] Width of bitmap
 124  *    height [I] Height of bitmap
 125  *
 126  * RETURNS
 127  *    Success: Handle to bitmap
 128  *    Failure: 0
 129  */
 130 HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height)
 131 {
 132     HBITMAP hbmpRet = 0;
 133
 134     TRACE("(%p,%d,%d) =\n", hdc, width, height);
 135
 136     if (GetObjectType( hdc ) != OBJ_MEMDC)
 137     {
 138         hbmpRet = CreateBitmap(width, height,
 139                                GetDeviceCaps(hdc, PLANES),
 140                                GetDeviceCaps(hdc, BITSPIXEL),
 141                                NULL);
 142     }
 143     else  /* Memory DC */
 144     {
 145         DIBSECTION dib;
 146         HBITMAP bitmap = GetCurrentObject( hdc, OBJ_BITMAP );
 147         INT size = GetObjectW( bitmap, sizeof(dib), &dib );
 148
 149         if (!size) return 0;
 150
 151         if (size == sizeof(BITMAP))
 152         {
 153             /* A device-dependent bitmap is selected in the DC */
 154             hbmpRet = CreateBitmap(width, height,
 155                                    dib.dsBm.bmPlanes,
 156                                    dib.dsBm.bmBitsPixel,
 157                                    NULL);
 158         }
 159         else
 160         {
 161             /* A DIB section is selected in the DC */
 162             BITMAPINFO *bi;
 163             void *bits;
 164
 165             /* Allocate memory for a BITMAPINFOHEADER structure and a
 166                color table. The maximum number of colors in a color table
 167                is 256 which corresponds to a bitmap with depth 8.
 168                Bitmaps with higher depths don't have color tables. */
 169             bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 170
 171             if (bi)
 172             {
 173                 bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
 174                 bi->bmiHeader.biWidth         = width;
 175                 bi->bmiHeader.biHeight        = height;
 176                 bi->bmiHeader.biPlanes        = dib.dsBmih.biPlanes;
 177                 bi->bmiHeader.biBitCount      = dib.dsBmih.biBitCount;
 178                 bi->bmiHeader.biCompression   = dib.dsBmih.biCompression;
 179                 bi->bmiHeader.biSizeImage     = 0;
 180                 bi->bmiHeader.biXPelsPerMeter = dib.dsBmih.biXPelsPerMeter;
 181                 bi->bmiHeader.biYPelsPerMeter = dib.dsBmih.biYPelsPerMeter;
 182                 bi->bmiHeader.biClrUsed       = dib.dsBmih.biClrUsed;
 183                 bi->bmiHeader.biClrImportant  = dib.dsBmih.biClrImportant;
 184
 185                 if (bi->bmiHeader.biCompression == BI_BITFIELDS)
 186                 {
 187                     /* Copy the color masks */
 188                     CopyMemory(bi->bmiColors, dib.dsBitfields, 3 * sizeof(DWORD));
 189                 }
 190                 else if (bi->bmiHeader.biBitCount <= 8)
 191                 {
 192                     /* Copy the color table */
 193                     GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
 194                 }
 195
 196                 hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
 197                 HeapFree(GetProcessHeap(), 0, bi);
 198             }
 199         }
 200     }
 201
 202     TRACE("\t\t%p\n", hbmpRet);
 203     return hbmpRet;
 204 }
 205
 206
 207 /******************************************************************************
 208  * CreateBitmapIndirect [GDI32.@]
 209  *
 210  * Creates a bitmap with the specified info.
 211  *
 212  * PARAMS
 213  *  bmp [I] Pointer to the bitmap info describing the bitmap
 214  *
 215  * RETURNS
 216  *    Success: Handle to bitmap
 217  *    Failure: NULL. Use GetLastError() to determine the cause.
 218  *
 219  * NOTES
 220  *  If a width or height of 0 are given, a 1x1 monochrome bitmap is returned.
 221  */
 222 HBITMAP WINAPI CreateBitmapIndirect( const BITMAP *bmp )
 223 {
 224     BITMAP bm;
 225     BITMAPOBJ *bmpobj;
 226     HBITMAP hbitmap;
 227
 228     if (!bmp || bmp->bmType)
 229     {
 230         SetLastError( ERROR_INVALID_PARAMETER );
 231         return NULL;
 232     }
 233
 234     if (bmp->bmWidth > 0x7ffffff || bmp->bmHeight > 0x7ffffff)
 235     {
 236         SetLastError( ERROR_INVALID_PARAMETER );
 237         return 0;
 238     }
 239
 240     bm = *bmp;
 241
 242     if (!bm.bmWidth || !bm.bmHeight)
 243     {
 244         return GetStockObject( DEFAULT_BITMAP );
 245     }
 246     else
 247     {
 248         if (bm.bmHeight < 0)
 249             bm.bmHeight = -bm.bmHeight;
 250         if (bm.bmWidth < 0)
 251             bm.bmWidth = -bm.bmWidth;
 252     }
 253
 254     if (bm.bmPlanes != 1)
 255     {
 256         FIXME("planes = %d\n", bm.bmPlanes);
 257         SetLastError( ERROR_INVALID_PARAMETER );
 258         return NULL;
 259     }
 260
 261     /* Windows only uses 1, 4, 8, 16, 24 and 32 bpp */
 262     if(bm.bmBitsPixel == 1)         bm.bmBitsPixel = 1;
 263     else if(bm.bmBitsPixel <= 4)    bm.bmBitsPixel = 4;
 264     else if(bm.bmBitsPixel <= 8)    bm.bmBitsPixel = 8;
 265     else if(bm.bmBitsPixel <= 16)   bm.bmBitsPixel = 16;
 266     else if(bm.bmBitsPixel <= 24)   bm.bmBitsPixel = 24;
 267     else if(bm.bmBitsPixel <= 32)   bm.bmBitsPixel = 32;
 268     else {
 269         WARN("Invalid bmBitsPixel %d, returning ERROR_INVALID_PARAMETER\n", bm.bmBitsPixel);
 270         SetLastError(ERROR_INVALID_PARAMETER);
 271         return NULL;
 272     }
 273
 274     /* Windows ignores the provided bm.bmWidthBytes */
 275     bm.bmWidthBytes = BITMAP_GetWidthBytes( bm.bmWidth, bm.bmBitsPixel );
 276     /* XP doesn't allow to create bitmaps larger than 128 Mb */
 277     if (bm.bmHeight > 128 * 1024 * 1024 / bm.bmWidthBytes)
 278     {
 279         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 280         return 0;
 281     }
 282
 283       /* Create the BITMAPOBJ */
 284     bmpobj = GDI_AllocObject( sizeof(BITMAPOBJ), BITMAP_MAGIC,
 285                               (HGDIOBJ *)&hbitmap, &bitmap_funcs );
 286
 287     if (!bmpobj)
 288     {
 289         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 290         return NULL;
 291     }
 292
 293     TRACE("%dx%d, %d colors returning %p\n", bm.bmWidth, bm.bmHeight,
 294           1 << (bm.bmPlanes * bm.bmBitsPixel), hbitmap);
 295
 296     bmpobj->size.cx = 0;
 297     bmpobj->size.cy = 0;
 298     bmpobj->bitmap = bm;
 299     bmpobj->bitmap.bmBits = NULL;
 300     bmpobj->funcs = NULL;
 301     bmpobj->dib = NULL;
 302     bmpobj->segptr_bits = 0;
 303     bmpobj->color_table = NULL;
 304     bmpobj->nb_colors = 0;
 305
 306     if (bm.bmBits)
 307         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 308
 309     GDI_ReleaseObj( hbitmap );
 310     return hbitmap;
 311 }
 312
 313
 314 /***********************************************************************
 315  * GetBitmapBits [GDI32.@]
 316  *
 317  * Copies bitmap bits of bitmap to buffer.
 318  *
 319  * RETURNS
 320  *    Success: Number of bytes copied
 321  *    Failure: 0
 322  */
 323 LONG WINAPI GetBitmapBits(
 324     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 325     LONG count,        /* [in]  Number of bytes to copy */
 326     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 327 {
 328     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 329     LONG height, ret;
 330
 331     if (!bmp) return 0;
 332
 333     if (bmp->dib)  /* simply copy the bits from the DIB */
 334     {
 335         DIBSECTION *dib = bmp->dib;
 336         const char *src = dib->dsBm.bmBits;
 337         INT width_bytes = BITMAP_GetWidthBytes(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
 338         LONG max = width_bytes * bmp->bitmap.bmHeight;
 339
 340         if (!bits)
 341         {
 342             ret = max;
 343             goto done;
 344         }
 345
 346         if (count > max) count = max;
 347         ret = count;
 348
 349         /* GetBitmapBits returns not 32-bit aligned data */
 350
 351         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 352         {
 353             src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 354             while (count > 0)
 355             {
 356                 src -= dib->dsBm.bmWidthBytes;
 357                 memcpy( bits, src, min( count, width_bytes ) );
 358                 bits = (char *)bits + width_bytes;
 359                 count -= width_bytes;
 360             }
 361         }
 362         else
 363         {
 364             while (count > 0)
 365             {
 366                 memcpy( bits, src, min( count, width_bytes ) );
 367                 src += dib->dsBm.bmWidthBytes;
 368                 bits = (char *)bits + width_bytes;
 369                 count -= width_bytes;
 370             }
 371         }
 372         goto done;
 373     }
 374
 375     /* If the bits vector is null, the function should return the read size */
 376     if(bits == NULL)
 377     {
 378         ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
 379         goto done;
 380     }
 381
 382     if (count < 0) {
 383         WARN("(%d): Negative number of bytes passed???\n", count );
 384         count = -count;
 385     }
 386
 387     /* Only get entire lines */
 388     height = count / bmp->bitmap.bmWidthBytes;
 389     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 390     count = height * bmp->bitmap.bmWidthBytes;
 391     if (count == 0)
 392       {
 393         WARN("Less than one entire line requested\n");
 394         ret = 0;
 395         goto done;
 396       }
 397
 398
 399     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 400           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 401           1 << bmp->bitmap.bmBitsPixel, height );
 402
 403     if(bmp->funcs && bmp->funcs->pGetBitmapBits)
 404     {
 405         TRACE("Calling device specific BitmapBits\n");
 406         ret = bmp->funcs->pGetBitmapBits(hbitmap, bits, count);
 407     } else {
 408
 409         if(!bmp->bitmap.bmBits) {
 410             TRACE("Bitmap is empty\n");
 411             memset(bits, 0, count);
 412             ret = count;
 413         } else {
 414             memcpy(bits, bmp->bitmap.bmBits, count);
 415             ret = count;
 416         }
 417
 418     }
 419  done:
 420     GDI_ReleaseObj( hbitmap );
 421     return ret;
 422 }
 423
 424
 425 /******************************************************************************
 426  * SetBitmapBits [GDI32.@]
 427  *
 428  * Sets bits of color data for a bitmap.
 429  *
 430  * RETURNS
 431  *    Success: Number of bytes used in setting the bitmap bits
 432  *    Failure: 0
 433  */
 434 LONG WINAPI SetBitmapBits(
 435     HBITMAP hbitmap, /* [in] Handle to bitmap */
 436     LONG count,        /* [in] Number of bytes in bitmap array */
 437     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 438 {
 439     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 440     LONG height, ret;
 441
 442     if ((!bmp) || (!bits))
 443         return 0;
 444
 445     if (count < 0) {
 446         WARN("(%d): Negative number of bytes passed???\n", count );
 447         count = -count;
 448     }
 449
 450     if (bmp->dib)  /* simply copy the bits into the DIB */
 451     {
 452         DIBSECTION *dib = bmp->dib;
 453         char *dest = dib->dsBm.bmBits;
 454         LONG max = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 455         if (count > max) count = max;
 456         ret = count;
 457
 458         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 459         {
 460             dest += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 461             while (count > 0)
 462             {
 463                 dest -= dib->dsBm.bmWidthBytes;
 464                 memcpy( dest, bits, min( count, dib->dsBm.bmWidthBytes ) );
 465                 bits = (const char *)bits + dib->dsBm.bmWidthBytes;
 466                 count -= dib->dsBm.bmWidthBytes;
 467             }
 468         }
 469         else memcpy( dest, bits, count );
 470
 471         GDI_ReleaseObj( hbitmap );
 472         return ret;
 473     }
 474
 475     /* Only get entire lines */
 476     height = count / bmp->bitmap.bmWidthBytes;
 477     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 478     count = height * bmp->bitmap.bmWidthBytes;
 479
 480     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 481           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 482           1 << bmp->bitmap.bmBitsPixel, height );
 483
 484     if(bmp->funcs && bmp->funcs->pSetBitmapBits) {
 485
 486         TRACE("Calling device specific BitmapBits\n");
 487         ret = bmp->funcs->pSetBitmapBits(hbitmap, bits, count);
 488     } else {
 489
 490         if(!bmp->bitmap.bmBits) /* Alloc enough for entire bitmap */
 491             bmp->bitmap.bmBits = HeapAlloc( GetProcessHeap(), 0, count );
 492         if(!bmp->bitmap.bmBits) {
 493             WARN("Unable to allocate bit buffer\n");
 494             ret = 0;
 495         } else {
 496             memcpy(bmp->bitmap.bmBits, bits, count);
 497             ret = count;
 498         }
 499     }
 500
 501     GDI_ReleaseObj( hbitmap );
 502     return ret;
 503 }
 504
 505 /**********************************************************************
 506  *              BITMAP_CopyBitmap
 507  *
 508  */
 509 HBITMAP BITMAP_CopyBitmap(HBITMAP hbitmap)
 510 {
 511     HBITMAP res = 0;
 512     BITMAP bm;
 513
 514     if (!GetObjectW( hbitmap, sizeof(bm), &bm )) return 0;
 515     res = CreateBitmapIndirect(&bm);
 516
 517     if(res) {
 518         char *buf = HeapAlloc( GetProcessHeap(), 0, bm.bmWidthBytes *
 519                                bm.bmHeight );
 520         GetBitmapBits (hbitmap, bm.bmWidthBytes * bm.bmHeight, buf);
 521         SetBitmapBits (res, bm.bmWidthBytes * bm.bmHeight, buf);
 522         HeapFree( GetProcessHeap(), 0, buf );
 523     }
 524     return res;
 525 }
 526
 527
 528 /***********************************************************************
 529  *           BITMAP_SetOwnerDC
 530  *
 531  * Set the type of DC that owns the bitmap. This is used when the
 532  * bitmap is selected into a device to initialize the bitmap function
 533  * table.
 534  */
 535 BOOL BITMAP_SetOwnerDC( HBITMAP hbitmap, DC *dc )
 536 {
 537     BITMAPOBJ *bitmap;
 538     BOOL ret;
 539
 540     /* never set the owner of the stock bitmap since it can be selected in multiple DCs */
 541     if (hbitmap == GetStockObject(DEFAULT_BITMAP)) return TRUE;
 542
 543     if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC ))) return FALSE;
 544
 545     ret = TRUE;
 546     if (!bitmap->funcs)  /* not owned by a DC yet */
 547     {
 548         if (dc->funcs->pCreateBitmap) ret = dc->funcs->pCreateBitmap( dc->physDev, hbitmap,
 549                                                                       bitmap->bitmap.bmBits );
 550         if (ret) bitmap->funcs = dc->funcs;
 551     }
 552     else if (bitmap->funcs != dc->funcs)
 553     {
 554         FIXME( "Trying to select bitmap %p in different DC type\n", hbitmap );
 555         ret = FALSE;
 556     }
 557     GDI_ReleaseObj( hbitmap );
 558     return ret;
 559 }
 560
 561
 562 /***********************************************************************
 563  *           BITMAP_SelectObject
 564  */
 565 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, HDC hdc )
 566 {
 567     HGDIOBJ ret;
 568     BITMAPOBJ *bitmap;
 569     DC *dc;
 570
 571     if (!(dc = get_dc_ptr( hdc ))) return 0;
 572
 573     if (GetObjectType( hdc ) != OBJ_MEMDC)
 574     {
 575         ret = 0;
 576         goto done;
 577     }
 578     ret = dc->hBitmap;
 579     if (handle == dc->hBitmap) goto done;  /* nothing to do */
 580
 581     if (!(bitmap = GDI_GetObjPtr( handle, BITMAP_MAGIC )))
 582     {
 583         ret = 0;
 584         goto done;
 585     }
 586
 587     if (bitmap->header.dwCount && (handle != GetStockObject(DEFAULT_BITMAP)))
 588     {
 589         WARN( "Bitmap already selected in another DC\n" );
 590         GDI_ReleaseObj( handle );
 591         ret = 0;
 592         goto done;
 593     }
 594
 595     if (!bitmap->funcs && !BITMAP_SetOwnerDC( handle, dc ))
 596     {
 597         GDI_ReleaseObj( handle );
 598         ret = 0;
 599         goto done;
 600     }
 601
 602     if (dc->funcs->pSelectBitmap && !dc->funcs->pSelectBitmap( dc->physDev, handle ))
 603     {
 604         GDI_ReleaseObj( handle );
 605         ret = 0;
 606     }
 607     else
 608     {
 609         dc->hBitmap = handle;
 610         GDI_inc_ref_count( handle );
 611         dc->dirty = 0;
 612         SetRectRgn( dc->hVisRgn, 0, 0, bitmap->bitmap.bmWidth, bitmap->bitmap.bmHeight);
 613         GDI_ReleaseObj( handle );
 614         DC_InitDC( dc );
 615         GDI_dec_ref_count( ret );
 616     }
 617
 618  done:
 619     release_dc_ptr( dc );
 620     return ret;
 621 }
 622
 623
 624 /***********************************************************************
 625  *           BITMAP_DeleteObject
 626  */
 627 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj )
 628 {
 629     BITMAPOBJ * bmp = obj;
 630
 631     if (bmp->funcs && bmp->funcs->pDeleteBitmap)
 632         bmp->funcs->pDeleteBitmap( handle );
 633
 634     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 635
 636     if (bmp->dib)
 637     {
 638         DIBSECTION *dib = bmp->dib;
 639
 640         if (dib->dsBm.bmBits)
 641         {
 642             if (dib->dshSection)
 643             {
 644                 SYSTEM_INFO SystemInfo;
 645                 GetSystemInfo( &SystemInfo );
 646                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 647                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 648             }
 649             else if (!dib->dsOffset)
 650                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 651         }
 652         HeapFree(GetProcessHeap(), 0, dib);
 653         bmp->dib = NULL;
 654         if (bmp->segptr_bits)
 655         { /* free its selector array */
 656             WORD sel = SELECTOROF(bmp->segptr_bits);
 657             WORD count = (GetSelectorLimit16(sel) / 0x10000) + 1;
 658             int i;
 659
 660             for (i = 0; i < count; i++) FreeSelector16(sel + (i << __AHSHIFT));
 661         }
 662         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 663     }
 664     return GDI_FreeObject( handle, obj );
 665 }
 666
 667
 668 /***********************************************************************
 669  *           BITMAP_GetObject
 670  */
 671 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 672 {
 673     BITMAPOBJ *bmp = obj;
 674
 675     if( !buffer ) return sizeof(BITMAP);
 676     if (count < sizeof(BITMAP)) return 0;
 677
 678     if (bmp->dib)
 679     {
 680         if (count >= sizeof(DIBSECTION))
 681         {
 682             memcpy( buffer, bmp->dib, sizeof(DIBSECTION) );
 683             return sizeof(DIBSECTION);
 684         }
 685         else /* if (count >= sizeof(BITMAP)) */
 686         {
 687             DIBSECTION *dib = bmp->dib;
 688             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 689             return sizeof(BITMAP);
 690         }
 691     }
 692     else
 693     {
 694         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 695         ((BITMAP *) buffer)->bmBits = NULL;
 696         return sizeof(BITMAP);
 697     }
 698 }
 699
 700
 701 /******************************************************************************
 702  * CreateDiscardableBitmap [GDI32.@]
 703  *
 704  * Creates a discardable bitmap.
 705  *
 706  * RETURNS
 707  *    Success: Handle to bitmap
 708  *    Failure: NULL
 709  */
 710 HBITMAP WINAPI CreateDiscardableBitmap(
 711     HDC hdc,    /* [in] Handle to device context */
 712     INT width,  /* [in] Bitmap width */
 713     INT height) /* [in] Bitmap height */
 714 {
 715     return CreateCompatibleBitmap( hdc, width, height );
 716 }
 717
 718
 719 /******************************************************************************
 720  * GetBitmapDimensionEx [GDI32.@]
 721  *
 722  * Retrieves dimensions of a bitmap.
 723  *
 724  * RETURNS
 725  *    Success: TRUE
 726  *    Failure: FALSE
 727  */
 728 BOOL WINAPI GetBitmapDimensionEx(
 729     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 730     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 731 {
 732     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 733     if (!bmp) return FALSE;
 734     *size = bmp->size;
 735     GDI_ReleaseObj( hbitmap );
 736     return TRUE;
 737 }
 738
 739
 740 /******************************************************************************
 741  * SetBitmapDimensionEx [GDI32.@]
 742  *
 743  * Assigns dimensions to a bitmap.
 744  * MSDN says that this function will fail if hbitmap is a handle created by
 745  * CreateDIBSection, but that's not true on Windows 2000.
 746  *
 747  * RETURNS
 748  *    Success: TRUE
 749  *    Failure: FALSE
 750  */
 751 BOOL WINAPI SetBitmapDimensionEx(
 752     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 753     INT x,           /* [in]  Bitmap width */
 754     INT y,           /* [in]  Bitmap height */
 755     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 756 {
 757     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 758     if (!bmp) return FALSE;
 759     if (prevSize) *prevSize = bmp->size;
 760     bmp->size.cx = x;
 761     bmp->size.cy = y;
 762     GDI_ReleaseObj( hbitmap );
 763     return TRUE;
 764 }