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_GetObject16( HGDIOBJ handle, void *obj, INT count, LPVOID buffer );
  38 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer );
  39 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj );
  40
  41 static const struct gdi_obj_funcs bitmap_funcs =
  42 {
  43     BITMAP_SelectObject,  /* pSelectObject */
  44     BITMAP_GetObject16,   /* pGetObject16 */
  45     BITMAP_GetObject,     /* pGetObjectA */
  46     BITMAP_GetObject,     /* pGetObjectW */
  47     NULL,                 /* pUnrealizeObject */
  48     BITMAP_DeleteObject   /* pDeleteObject */
  49 };
  50
  51 /***********************************************************************
  52  *           BITMAP_GetWidthBytes
  53  *
  54  * Return number of bytes taken by a scanline of 16-bit aligned Windows DDB
  55  * data.
  56  */
  57 INT BITMAP_GetWidthBytes( INT bmWidth, INT bpp )
  58 {
  59     switch(bpp)
  60     {
  61     case 1:
  62         return 2 * ((bmWidth+15) >> 4);
  63
  64     case 24:
  65         bmWidth *= 3; /* fall through */
  66     case 8:
  67         return bmWidth + (bmWidth & 1);
  68
  69     case 32:
  70         return bmWidth * 4;
  71
  72     case 16:
  73     case 15:
  74         return bmWidth * 2;
  75
  76     case 4:
  77         return 2 * ((bmWidth+3) >> 2);
  78
  79     default:
  80         WARN("Unknown depth %d, please report.\n", bpp );
  81     }
  82     return -1;
  83 }
  84
  85
  86 /******************************************************************************
  87  * CreateBitmap [GDI32.@]
  88  *
  89  * Creates a bitmap with the specified info.
  90  *
  91  * PARAMS
  92  *    width  [I] bitmap width
  93  *    height [I] bitmap height
  94  *    planes [I] Number of color planes
  95  *    bpp    [I] Number of bits to identify a color
  96  *    bits   [I] Pointer to array containing color data
  97  *
  98  * RETURNS
  99  *    Success: Handle to bitmap
 100  *    Failure: 0
 101  */
 102 HBITMAP WINAPI CreateBitmap( INT width, INT height, UINT planes,
 103                              UINT bpp, LPCVOID bits )
 104 {
 105     BITMAP bm;
 106
 107     bm.bmType = 0;
 108     bm.bmWidth = width;
 109     bm.bmHeight = height;
 110     bm.bmWidthBytes = BITMAP_GetWidthBytes( width, bpp );
 111     bm.bmPlanes = planes;
 112     bm.bmBitsPixel = bpp;
 113     bm.bmBits = (LPVOID)bits;
 114
 115     return CreateBitmapIndirect( &bm );
 116 }
 117
 118 /******************************************************************************
 119  * CreateCompatibleBitmap [GDI32.@]
 120  *
 121  * Creates a bitmap compatible with the DC.
 122  *
 123  * PARAMS
 124  *    hdc    [I] Handle to device context
 125  *    width  [I] Width of bitmap
 126  *    height [I] Height of bitmap
 127  *
 128  * RETURNS
 129  *    Success: Handle to bitmap
 130  *    Failure: 0
 131  */
 132 HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height)
 133 {
 134     HBITMAP hbmpRet = 0;
 135
 136     TRACE("(%p,%d,%d) =\n", hdc, width, height);
 137
 138     if (GetObjectType( hdc ) != OBJ_MEMDC)
 139     {
 140         hbmpRet = CreateBitmap(width, height,
 141                                GetDeviceCaps(hdc, PLANES),
 142                                GetDeviceCaps(hdc, BITSPIXEL),
 143                                NULL);
 144     }
 145     else  /* Memory DC */
 146     {
 147         DIBSECTION dib;
 148         HBITMAP bitmap = GetCurrentObject( hdc, OBJ_BITMAP );
 149         INT size = GetObjectW( bitmap, sizeof(dib), &dib );
 150
 151         if (!size) return 0;
 152
 153         if (size == sizeof(BITMAP))
 154         {
 155             /* A device-dependent bitmap is selected in the DC */
 156             hbmpRet = CreateBitmap(width, height,
 157                                    dib.dsBm.bmPlanes,
 158                                    dib.dsBm.bmBitsPixel,
 159                                    NULL);
 160         }
 161         else
 162         {
 163             /* A DIB section is selected in the DC */
 164             BITMAPINFO *bi;
 165             void *bits;
 166
 167             /* Allocate memory for a BITMAPINFOHEADER structure and a
 168                color table. The maximum number of colors in a color table
 169                is 256 which corresponds to a bitmap with depth 8.
 170                Bitmaps with higher depths don't have color tables. */
 171             bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 172
 173             if (bi)
 174             {
 175                 bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
 176                 bi->bmiHeader.biWidth         = width;
 177                 bi->bmiHeader.biHeight        = height;
 178                 bi->bmiHeader.biPlanes        = dib.dsBmih.biPlanes;
 179                 bi->bmiHeader.biBitCount      = dib.dsBmih.biBitCount;
 180                 bi->bmiHeader.biCompression   = dib.dsBmih.biCompression;
 181                 bi->bmiHeader.biSizeImage     = 0;
 182                 bi->bmiHeader.biXPelsPerMeter = dib.dsBmih.biXPelsPerMeter;
 183                 bi->bmiHeader.biYPelsPerMeter = dib.dsBmih.biYPelsPerMeter;
 184                 bi->bmiHeader.biClrUsed       = dib.dsBmih.biClrUsed;
 185                 bi->bmiHeader.biClrImportant  = dib.dsBmih.biClrImportant;
 186
 187                 if (bi->bmiHeader.biCompression == BI_BITFIELDS)
 188                 {
 189                     /* Copy the color masks */
 190                     CopyMemory(bi->bmiColors, dib.dsBitfields, 3 * sizeof(DWORD));
 191                 }
 192                 else if (bi->bmiHeader.biBitCount <= 8)
 193                 {
 194                     /* Copy the color table */
 195                     GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
 196                 }
 197
 198                 hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
 199                 HeapFree(GetProcessHeap(), 0, bi);
 200             }
 201         }
 202     }
 203
 204     TRACE("\t\t%p\n", hbmpRet);
 205     return hbmpRet;
 206 }
 207
 208
 209 /******************************************************************************
 210  * CreateBitmapIndirect [GDI32.@]
 211  *
 212  * Creates a bitmap with the specified info.
 213  *
 214  * PARAMS
 215  *  bmp [I] Pointer to the bitmap info describing the bitmap
 216  *
 217  * RETURNS
 218  *    Success: Handle to bitmap
 219  *    Failure: NULL. Use GetLastError() to determine the cause.
 220  *
 221  * NOTES
 222  *  If a width or height of 0 are given, a 1x1 monochrome bitmap is returned.
 223  */
 224 HBITMAP WINAPI CreateBitmapIndirect( const BITMAP *bmp )
 225 {
 226     BITMAP bm;
 227     BITMAPOBJ *bmpobj;
 228     HBITMAP hbitmap;
 229
 230     if (!bmp || bmp->bmType)
 231     {
 232         SetLastError( ERROR_INVALID_PARAMETER );
 233         return NULL;
 234     }
 235
 236     if (bmp->bmWidth > 0x7ffffff || bmp->bmHeight > 0x7ffffff)
 237     {
 238         SetLastError( ERROR_INVALID_PARAMETER );
 239         return 0;
 240     }
 241
 242     bm = *bmp;
 243
 244     if (!bm.bmWidth || !bm.bmHeight)
 245     {
 246         return GetStockObject( DEFAULT_BITMAP );
 247     }
 248     else
 249     {
 250         if (bm.bmHeight < 0)
 251             bm.bmHeight = -bm.bmHeight;
 252         if (bm.bmWidth < 0)
 253             bm.bmWidth = -bm.bmWidth;
 254     }
 255
 256     if (bm.bmPlanes != 1)
 257     {
 258         FIXME("planes = %d\n", bm.bmPlanes);
 259         SetLastError( ERROR_INVALID_PARAMETER );
 260         return NULL;
 261     }
 262
 263     /* Windows only uses 1, 4, 8, 16, 24 and 32 bpp */
 264     if(bm.bmBitsPixel == 1)         bm.bmBitsPixel = 1;
 265     else if(bm.bmBitsPixel <= 4)    bm.bmBitsPixel = 4;
 266     else if(bm.bmBitsPixel <= 8)    bm.bmBitsPixel = 8;
 267     else if(bm.bmBitsPixel <= 16)   bm.bmBitsPixel = 16;
 268     else if(bm.bmBitsPixel <= 24)   bm.bmBitsPixel = 24;
 269     else if(bm.bmBitsPixel <= 32)   bm.bmBitsPixel = 32;
 270     else {
 271         WARN("Invalid bmBitsPixel %d, returning ERROR_INVALID_PARAMETER\n", bm.bmBitsPixel);
 272         SetLastError(ERROR_INVALID_PARAMETER);
 273         return NULL;
 274     }
 275
 276     /* Windows ignores the provided bm.bmWidthBytes */
 277     bm.bmWidthBytes = BITMAP_GetWidthBytes( bm.bmWidth, bm.bmBitsPixel );
 278     /* XP doesn't allow to create bitmaps larger than 128 Mb */
 279     if (bm.bmHeight * bm.bmWidthBytes > 128 * 1024 * 1024)
 280     {
 281         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 282         return 0;
 283     }
 284
 285       /* Create the BITMAPOBJ */
 286     bmpobj = GDI_AllocObject( sizeof(BITMAPOBJ), BITMAP_MAGIC,
 287                               (HGDIOBJ *)&hbitmap, &bitmap_funcs );
 288
 289     if (!bmpobj)
 290     {
 291         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 292         return NULL;
 293     }
 294
 295     TRACE("%dx%d, %d colors returning %p\n", bm.bmWidth, bm.bmHeight,
 296           1 << (bm.bmPlanes * bm.bmBitsPixel), hbitmap);
 297
 298     bmpobj->size.cx = 0;
 299     bmpobj->size.cy = 0;
 300     bmpobj->bitmap = bm;
 301     bmpobj->bitmap.bmBits = NULL;
 302     bmpobj->funcs = NULL;
 303     bmpobj->dib = NULL;
 304     bmpobj->segptr_bits = 0;
 305     bmpobj->color_table = NULL;
 306     bmpobj->nb_colors = 0;
 307
 308     if (bm.bmBits)
 309         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 310
 311     GDI_ReleaseObj( hbitmap );
 312     return hbitmap;
 313 }
 314
 315
 316 /***********************************************************************
 317  * GetBitmapBits [GDI32.@]
 318  *
 319  * Copies bitmap bits of bitmap to buffer.
 320  *
 321  * RETURNS
 322  *    Success: Number of bytes copied
 323  *    Failure: 0
 324  */
 325 LONG WINAPI GetBitmapBits(
 326     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 327     LONG count,        /* [in]  Number of bytes to copy */
 328     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 329 {
 330     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 331     LONG height, ret;
 332
 333     if (!bmp) return 0;
 334
 335     if (bmp->dib)  /* simply copy the bits from the DIB */
 336     {
 337         DIBSECTION *dib = bmp->dib;
 338         const char *src = dib->dsBm.bmBits;
 339         INT width_bytes = BITMAP_GetWidthBytes(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
 340         DWORD max = width_bytes * bmp->bitmap.bmHeight;
 341
 342         if (!bits)
 343         {
 344             ret = max;
 345             goto done;
 346         }
 347
 348         if (count > max) count = max;
 349         ret = count;
 350
 351         /* GetBitmapBits returns not 32-bit aligned data */
 352
 353         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 354         {
 355             src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 356             while (count > 0)
 357             {
 358                 src -= dib->dsBm.bmWidthBytes;
 359                 memcpy( bits, src, min( count, width_bytes ) );
 360                 bits = (char *)bits + width_bytes;
 361                 count -= width_bytes;
 362             }
 363         }
 364         else
 365         {
 366             while (count > 0)
 367             {
 368                 memcpy( bits, src, min( count, width_bytes ) );
 369                 src += dib->dsBm.bmWidthBytes;
 370                 bits = (char *)bits + width_bytes;
 371                 count -= width_bytes;
 372             }
 373         }
 374         goto done;
 375     }
 376
 377     /* If the bits vector is null, the function should return the read size */
 378     if(bits == NULL)
 379     {
 380         ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
 381         goto done;
 382     }
 383
 384     if (count < 0) {
 385         WARN("(%d): Negative number of bytes passed???\n", count );
 386         count = -count;
 387     }
 388
 389     /* Only get entire lines */
 390     height = count / bmp->bitmap.bmWidthBytes;
 391     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 392     count = height * bmp->bitmap.bmWidthBytes;
 393     if (count == 0)
 394       {
 395         WARN("Less than one entire line requested\n");
 396         ret = 0;
 397         goto done;
 398       }
 399
 400
 401     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 402           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 403           1 << bmp->bitmap.bmBitsPixel, height );
 404
 405     if(bmp->funcs && bmp->funcs->pGetBitmapBits)
 406     {
 407         TRACE("Calling device specific BitmapBits\n");
 408         ret = bmp->funcs->pGetBitmapBits(hbitmap, bits, count);
 409     } else {
 410
 411         if(!bmp->bitmap.bmBits) {
 412             TRACE("Bitmap is empty\n");
 413             memset(bits, 0, count);
 414             ret = count;
 415         } else {
 416             memcpy(bits, bmp->bitmap.bmBits, count);
 417             ret = count;
 418         }
 419
 420     }
 421  done:
 422     GDI_ReleaseObj( hbitmap );
 423     return ret;
 424 }
 425
 426
 427 /******************************************************************************
 428  * SetBitmapBits [GDI32.@]
 429  *
 430  * Sets bits of color data for a bitmap.
 431  *
 432  * RETURNS
 433  *    Success: Number of bytes used in setting the bitmap bits
 434  *    Failure: 0
 435  */
 436 LONG WINAPI SetBitmapBits(
 437     HBITMAP hbitmap, /* [in] Handle to bitmap */
 438     LONG count,        /* [in] Number of bytes in bitmap array */
 439     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 440 {
 441     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 442     LONG height, ret;
 443
 444     if ((!bmp) || (!bits))
 445         return 0;
 446
 447     if (count < 0) {
 448         WARN("(%d): Negative number of bytes passed???\n", count );
 449         count = -count;
 450     }
 451
 452     if (bmp->dib)  /* simply copy the bits into the DIB */
 453     {
 454         DIBSECTION *dib = bmp->dib;
 455         char *dest = dib->dsBm.bmBits;
 456         DWORD max = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 457         if (count > max) count = max;
 458         ret = count;
 459
 460         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 461         {
 462             dest += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 463             while (count > 0)
 464             {
 465                 dest -= dib->dsBm.bmWidthBytes;
 466                 memcpy( dest, bits, min( count, dib->dsBm.bmWidthBytes ) );
 467                 bits = (const char *)bits + dib->dsBm.bmWidthBytes;
 468                 count -= dib->dsBm.bmWidthBytes;
 469             }
 470         }
 471         else memcpy( dest, bits, count );
 472
 473         GDI_ReleaseObj( hbitmap );
 474         return ret;
 475     }
 476
 477     /* Only get entire lines */
 478     height = count / bmp->bitmap.bmWidthBytes;
 479     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 480     count = height * bmp->bitmap.bmWidthBytes;
 481
 482     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 483           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 484           1 << bmp->bitmap.bmBitsPixel, height );
 485
 486     if(bmp->funcs && bmp->funcs->pSetBitmapBits) {
 487
 488         TRACE("Calling device specific BitmapBits\n");
 489         ret = bmp->funcs->pSetBitmapBits(hbitmap, bits, count);
 490     } else {
 491
 492         if(!bmp->bitmap.bmBits) /* Alloc enough for entire bitmap */
 493             bmp->bitmap.bmBits = HeapAlloc( GetProcessHeap(), 0, count );
 494         if(!bmp->bitmap.bmBits) {
 495             WARN("Unable to allocate bit buffer\n");
 496             ret = 0;
 497         } else {
 498             memcpy(bmp->bitmap.bmBits, bits, count);
 499             ret = count;
 500         }
 501     }
 502
 503     GDI_ReleaseObj( hbitmap );
 504     return ret;
 505 }
 506
 507 /**********************************************************************
 508  *              BITMAP_CopyBitmap
 509  *
 510  */
 511 HBITMAP BITMAP_CopyBitmap(HBITMAP hbitmap)
 512 {
 513     HBITMAP res = 0;
 514     BITMAP bm;
 515
 516     if (!GetObjectW( hbitmap, sizeof(bm), &bm )) return 0;
 517     res = CreateBitmapIndirect(&bm);
 518
 519     if(res) {
 520         char *buf = HeapAlloc( GetProcessHeap(), 0, bm.bmWidthBytes *
 521                                bm.bmHeight );
 522         GetBitmapBits (hbitmap, bm.bmWidthBytes * bm.bmHeight, buf);
 523         SetBitmapBits (res, bm.bmWidthBytes * bm.bmHeight, buf);
 524         HeapFree( GetProcessHeap(), 0, buf );
 525     }
 526     return res;
 527 }
 528
 529
 530 /***********************************************************************
 531  *           BITMAP_SetOwnerDC
 532  *
 533  * Set the type of DC that owns the bitmap. This is used when the
 534  * bitmap is selected into a device to initialize the bitmap function
 535  * table.
 536  */
 537 BOOL BITMAP_SetOwnerDC( HBITMAP hbitmap, DC *dc )
 538 {
 539     BITMAPOBJ *bitmap;
 540     BOOL ret;
 541
 542     /* never set the owner of the stock bitmap since it can be selected in multiple DCs */
 543     if (hbitmap == GetStockObject(DEFAULT_BITMAP)) return TRUE;
 544
 545     if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC ))) return FALSE;
 546
 547     ret = TRUE;
 548     if (!bitmap->funcs)  /* not owned by a DC yet */
 549     {
 550         if (dc->funcs->pCreateBitmap) ret = dc->funcs->pCreateBitmap( dc->physDev, hbitmap,
 551                                                                       bitmap->bitmap.bmBits );
 552         if (ret) bitmap->funcs = dc->funcs;
 553     }
 554     else if (bitmap->funcs != dc->funcs)
 555     {
 556         FIXME( "Trying to select bitmap %p in different DC type\n", hbitmap );
 557         ret = FALSE;
 558     }
 559     GDI_ReleaseObj( hbitmap );
 560     return ret;
 561 }
 562
 563
 564 /***********************************************************************
 565  *           BITMAP_SelectObject
 566  */
 567 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, HDC hdc )
 568 {
 569     HGDIOBJ ret;
 570     BITMAPOBJ *bitmap;
 571     DC *dc;
 572
 573     if (!(dc = get_dc_ptr( hdc ))) return 0;
 574
 575     if (GetObjectType( hdc ) != OBJ_MEMDC)
 576     {
 577         ret = 0;
 578         goto done;
 579     }
 580     ret = dc->hBitmap;
 581     if (handle == dc->hBitmap) goto done;  /* nothing to do */
 582
 583     if (!(bitmap = GDI_GetObjPtr( handle, BITMAP_MAGIC )))
 584     {
 585         ret = 0;
 586         goto done;
 587     }
 588
 589     if (bitmap->header.dwCount && (handle != GetStockObject(DEFAULT_BITMAP)))
 590     {
 591         WARN( "Bitmap already selected in another DC\n" );
 592         GDI_ReleaseObj( handle );
 593         ret = 0;
 594         goto done;
 595     }
 596
 597     if (!bitmap->funcs && !BITMAP_SetOwnerDC( handle, dc ))
 598     {
 599         GDI_ReleaseObj( handle );
 600         ret = 0;
 601         goto done;
 602     }
 603
 604     if (dc->funcs->pSelectBitmap && !dc->funcs->pSelectBitmap( dc->physDev, handle ))
 605     {
 606         GDI_ReleaseObj( handle );
 607         ret = 0;
 608     }
 609     else
 610     {
 611         dc->hBitmap = handle;
 612         GDI_inc_ref_count( handle );
 613         dc->dirty = 0;
 614         SetRectRgn( dc->hVisRgn, 0, 0, bitmap->bitmap.bmWidth, bitmap->bitmap.bmHeight);
 615         GDI_ReleaseObj( handle );
 616         DC_InitDC( dc );
 617         GDI_dec_ref_count( ret );
 618     }
 619
 620  done:
 621     release_dc_ptr( dc );
 622     return ret;
 623 }
 624
 625
 626 /***********************************************************************
 627  *           BITMAP_DeleteObject
 628  */
 629 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj )
 630 {
 631     BITMAPOBJ * bmp = obj;
 632
 633     if (bmp->funcs && bmp->funcs->pDeleteBitmap)
 634         bmp->funcs->pDeleteBitmap( handle );
 635
 636     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 637
 638     if (bmp->dib)
 639     {
 640         DIBSECTION *dib = bmp->dib;
 641
 642         if (dib->dsBm.bmBits)
 643         {
 644             if (dib->dshSection)
 645             {
 646                 SYSTEM_INFO SystemInfo;
 647                 GetSystemInfo( &SystemInfo );
 648                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 649                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 650             }
 651             else if (!dib->dsOffset)
 652                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 653         }
 654         HeapFree(GetProcessHeap(), 0, dib);
 655         bmp->dib = NULL;
 656         if (bmp->segptr_bits)
 657         { /* free its selector array */
 658             WORD sel = SELECTOROF(bmp->segptr_bits);
 659             WORD count = (GetSelectorLimit16(sel) / 0x10000) + 1;
 660             int i;
 661
 662             for (i = 0; i < count; i++) FreeSelector16(sel + (i << __AHSHIFT));
 663         }
 664         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 665     }
 666     return GDI_FreeObject( handle, obj );
 667 }
 668
 669
 670 /***********************************************************************
 671  *           BITMAP_GetObject16
 672  */
 673 static INT BITMAP_GetObject16( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 674 {
 675     BITMAPOBJ *bmp = obj;
 676
 677     if (bmp->dib)
 678     {
 679         if ( count <= sizeof(BITMAP16) )
 680         {
 681             BITMAP *bmp32 = &bmp->dib->dsBm;
 682             BITMAP16 bmp16;
 683             bmp16.bmType       = bmp32->bmType;
 684             bmp16.bmWidth      = bmp32->bmWidth;
 685             bmp16.bmHeight     = bmp32->bmHeight;
 686             bmp16.bmWidthBytes = bmp32->bmWidthBytes;
 687             bmp16.bmPlanes     = bmp32->bmPlanes;
 688             bmp16.bmBitsPixel  = bmp32->bmBitsPixel;
 689             bmp16.bmBits       = (SEGPTR)0;
 690             memcpy( buffer, &bmp16, count );
 691             return count;
 692         }
 693         else
 694         {
 695             FIXME("not implemented for DIBs: count %d\n", count);
 696             return 0;
 697         }
 698     }
 699     else
 700     {
 701         BITMAP16 bmp16;
 702         bmp16.bmType       = bmp->bitmap.bmType;
 703         bmp16.bmWidth      = bmp->bitmap.bmWidth;
 704         bmp16.bmHeight     = bmp->bitmap.bmHeight;
 705         bmp16.bmWidthBytes = bmp->bitmap.bmWidthBytes;
 706         bmp16.bmPlanes     = bmp->bitmap.bmPlanes;
 707         bmp16.bmBitsPixel  = bmp->bitmap.bmBitsPixel;
 708         bmp16.bmBits       = (SEGPTR)0;
 709         if (count < sizeof(bmp16)) return 0;
 710         memcpy( buffer, &bmp16, sizeof(bmp16) );
 711         return sizeof(bmp16);
 712     }
 713 }
 714
 715
 716 /***********************************************************************
 717  *           BITMAP_GetObject
 718  */
 719 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 720 {
 721     BITMAPOBJ *bmp = obj;
 722
 723     if( !buffer ) return sizeof(BITMAP);
 724     if (count < sizeof(BITMAP)) return 0;
 725
 726     if (bmp->dib)
 727     {
 728         if (count >= sizeof(DIBSECTION))
 729         {
 730             memcpy( buffer, bmp->dib, sizeof(DIBSECTION) );
 731             return sizeof(DIBSECTION);
 732         }
 733         else /* if (count >= sizeof(BITMAP)) */
 734         {
 735             DIBSECTION *dib = bmp->dib;
 736             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 737             return sizeof(BITMAP);
 738         }
 739     }
 740     else
 741     {
 742         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 743         ((BITMAP *) buffer)->bmBits = NULL;
 744         return sizeof(BITMAP);
 745     }
 746 }
 747
 748
 749 /******************************************************************************
 750  * CreateDiscardableBitmap [GDI32.@]
 751  *
 752  * Creates a discardable bitmap.
 753  *
 754  * RETURNS
 755  *    Success: Handle to bitmap
 756  *    Failure: NULL
 757  */
 758 HBITMAP WINAPI CreateDiscardableBitmap(
 759     HDC hdc,    /* [in] Handle to device context */
 760     INT width,  /* [in] Bitmap width */
 761     INT height) /* [in] Bitmap height */
 762 {
 763     return CreateCompatibleBitmap( hdc, width, height );
 764 }
 765
 766
 767 /******************************************************************************
 768  * GetBitmapDimensionEx [GDI32.@]
 769  *
 770  * Retrieves dimensions of a bitmap.
 771  *
 772  * RETURNS
 773  *    Success: TRUE
 774  *    Failure: FALSE
 775  */
 776 BOOL WINAPI GetBitmapDimensionEx(
 777     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 778     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 779 {
 780     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 781     if (!bmp) return FALSE;
 782     *size = bmp->size;
 783     GDI_ReleaseObj( hbitmap );
 784     return TRUE;
 785 }
 786
 787
 788 /******************************************************************************
 789  * SetBitmapDimensionEx [GDI32.@]
 790  *
 791  * Assigns dimensions to a bitmap.
 792  * MSDN says that this function will fail if hbitmap is a handle created by
 793  * CreateDIBSection, but that's not true on Windows 2000.
 794  *
 795  * RETURNS
 796  *    Success: TRUE
 797  *    Failure: FALSE
 798  */
 799 BOOL WINAPI SetBitmapDimensionEx(
 800     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 801     INT x,           /* [in]  Bitmap width */
 802     INT y,           /* [in]  Bitmap height */
 803     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 804 {
 805     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 806     if (!bmp) return FALSE;
 807     if (prevSize) *prevSize = bmp->size;
 808     bmp->size.cx = x;
 809     bmp->size.cy = y;
 810     GDI_ReleaseObj( hbitmap );
 811     return TRUE;
 812 }