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 <stdlib.h>
  23 #include <string.h>
  24
  25 #include "wine/winbase16.h"
  26 #include "wine/wingdi16.h"
  27 #include "gdi.h"
  28 #include "gdi_private.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(bitmap);
  32
  33
  34 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, void *obj, HDC hdc );
  35 static INT BITMAP_GetObject16( HGDIOBJ handle, void *obj, INT count, LPVOID buffer );
  36 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer );
  37 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj );
  38
  39 static const struct gdi_obj_funcs bitmap_funcs =
  40 {
  41     BITMAP_SelectObject,  /* pSelectObject */
  42     BITMAP_GetObject16,   /* pGetObject16 */
  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     DC *dc;
 134
 135     TRACE("(%p,%d,%d) =\n", hdc, width, height);
 136
 137     if ((width >= 0x10000) || (height >= 0x10000))
 138     {
 139         FIXME("got bad width %d or height %d, please look for reason\n",
 140               width, height);
 141     }
 142     else
 143     {
 144         if (!(dc = DC_GetDCPtr(hdc))) return 0;
 145
 146         if (GDIMAGIC( dc->header.wMagic ) != MEMORY_DC_MAGIC)
 147         {
 148             hbmpRet = CreateBitmap(width, height,
 149                                    GetDeviceCaps(hdc, PLANES),
 150                                    GetDeviceCaps(hdc, BITSPIXEL),
 151                                    NULL);
 152         }
 153         else  /* Memory DC */
 154         {
 155             BITMAPOBJ *bmp = GDI_GetObjPtr( dc->hBitmap, BITMAP_MAGIC );
 156
 157             if (!bmp->dib)
 158             {
 159                 /* A device-dependent bitmap is selected in the DC */
 160                 hbmpRet = CreateBitmap(width, height,
 161                                        bmp->bitmap.bmPlanes,
 162                                        bmp->bitmap.bmBitsPixel,
 163                                        NULL);
 164             }
 165             else
 166             {
 167                 /* A DIB section is selected in the DC */
 168                 BITMAPINFO *bi;
 169                 void *bits;
 170
 171                 /* Allocate memory for a BITMAPINFOHEADER structure and a
 172                    color table. The maximum number of colors in a color table
 173                    is 256 which corresponds to a bitmap with depth 8.
 174                    Bitmaps with higher depths don't have color tables. */
 175                 bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 176
 177                 if (bi)
 178                 {
 179                     bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
 180                     bi->bmiHeader.biWidth         = width;
 181                     bi->bmiHeader.biHeight        = height;
 182                     bi->bmiHeader.biPlanes        = bmp->dib->dsBmih.biPlanes;
 183                     bi->bmiHeader.biBitCount      = bmp->dib->dsBmih.biBitCount;
 184                     bi->bmiHeader.biCompression   = bmp->dib->dsBmih.biCompression;
 185                     bi->bmiHeader.biSizeImage     = 0;
 186                     bi->bmiHeader.biXPelsPerMeter = bmp->dib->dsBmih.biXPelsPerMeter;
 187                     bi->bmiHeader.biYPelsPerMeter = bmp->dib->dsBmih.biYPelsPerMeter;
 188                     bi->bmiHeader.biClrUsed       = bmp->dib->dsBmih.biClrUsed;
 189                     bi->bmiHeader.biClrImportant  = bmp->dib->dsBmih.biClrImportant;
 190
 191                     if (bi->bmiHeader.biCompression == BI_BITFIELDS)
 192                     {
 193                         /* Copy the color masks */
 194                         CopyMemory(bi->bmiColors, bmp->dib->dsBitfields, 3 * sizeof(DWORD));
 195                     }
 196                     else if (bi->bmiHeader.biBitCount <= 8)
 197                     {
 198                         /* Copy the color table */
 199                         GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
 200                     }
 201
 202                     hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
 203                     HeapFree(GetProcessHeap(), 0, bi);
 204                 }
 205             }
 206             GDI_ReleaseObj(dc->hBitmap);
 207         }
 208         GDI_ReleaseObj(hdc);
 209     }
 210
 211     TRACE("\t\t%p\n", hbmpRet);
 212     return hbmpRet;
 213 }
 214
 215
 216 /******************************************************************************
 217  * CreateBitmapIndirect [GDI32.@]
 218  *
 219  * Creates a bitmap with the specified info.
 220  *
 221  * PARAMS
 222  *  bmp [I] Pointer to the bitmap info describing the bitmap
 223  *
 224  * RETURNS
 225  *    Success: Handle to bitmap
 226  *    Failure: NULL. Use GetLastError() to determine the cause.
 227  *
 228  * NOTES
 229  *  If a width or height of 0 are given, a 1x1 monochrome bitmap is returned.
 230  */
 231 HBITMAP WINAPI CreateBitmapIndirect( const BITMAP *bmp )
 232 {
 233     BITMAP bm;
 234     BITMAPOBJ *bmpobj;
 235     HBITMAP hbitmap;
 236
 237     if (!bmp || bmp->bmType || bmp->bmPlanes != 1)
 238     {
 239         if (bmp && bmp->bmPlanes != 1)
 240             FIXME("planes = %d\n", bmp->bmPlanes);
 241         SetLastError( ERROR_INVALID_PARAMETER );
 242         return NULL;
 243     }
 244
 245     bm = *bmp;
 246
 247     if (!bm.bmWidth || !bm.bmHeight)
 248     {
 249         bm.bmWidth = bm.bmHeight = 1;
 250         bm.bmPlanes = bm.bmBitsPixel = 1;
 251         bm.bmWidthBytes = 2;
 252         bm.bmBits = NULL;
 253     }
 254     else
 255     {
 256         if (bm.bmHeight < 0)
 257             bm.bmHeight = -bm.bmHeight;
 258         if (bm.bmWidth < 0)
 259             bm.bmWidth = -bm.bmWidth;
 260     }
 261
 262       /* Create the BITMAPOBJ */
 263     bmpobj = GDI_AllocObject( sizeof(BITMAPOBJ), BITMAP_MAGIC,
 264                               (HGDIOBJ *)&hbitmap, &bitmap_funcs );
 265
 266     if (!bmpobj)
 267     {
 268         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 269         return NULL;
 270     }
 271
 272     TRACE("%dx%d, %d colors returning %p\n", bm.bmWidth, bm.bmHeight,
 273           1 << (bm.bmPlanes * bm.bmBitsPixel), hbitmap);
 274
 275     bmpobj->size.cx = 0;
 276     bmpobj->size.cy = 0;
 277     bmpobj->bitmap = bm;
 278     bmpobj->bitmap.bmBits = NULL;
 279     bmpobj->funcs = NULL;
 280     bmpobj->dib = NULL;
 281     bmpobj->segptr_bits = 0;
 282     bmpobj->color_table = NULL;
 283     bmpobj->nb_colors = 0;
 284
 285     if (bm.bmBits)
 286         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 287
 288     GDI_ReleaseObj( hbitmap );
 289     return hbitmap;
 290 }
 291
 292
 293 /***********************************************************************
 294  * GetBitmapBits [GDI32.@]
 295  *
 296  * Copies bitmap bits of bitmap to buffer.
 297  *
 298  * RETURNS
 299  *    Success: Number of bytes copied
 300  *    Failure: 0
 301  */
 302 LONG WINAPI GetBitmapBits(
 303     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 304     LONG count,        /* [in]  Number of bytes to copy */
 305     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 306 {
 307     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 308     LONG height, ret;
 309
 310     if (!bmp) return 0;
 311
 312     if (bmp->dib)  /* simply copy the bits from the DIB */
 313     {
 314         DIBSECTION *dib = bmp->dib;
 315         const char *src = dib->dsBm.bmBits;
 316         INT width_bytes = BITMAP_GetWidthBytes(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
 317         DWORD max = width_bytes * bmp->bitmap.bmHeight;
 318
 319         if (!bits)
 320         {
 321             ret = max;
 322             goto done;
 323         }
 324
 325         if (count > max) count = max;
 326         ret = count;
 327
 328         /* GetBitmapBits returns not 32-bit aligned data */
 329
 330         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 331         {
 332             src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 333             while (count > 0)
 334             {
 335                 src -= dib->dsBm.bmWidthBytes;
 336                 memcpy( bits, src, min( count, width_bytes ) );
 337                 bits = (char *)bits + width_bytes;
 338                 count -= width_bytes;
 339             }
 340         }
 341         else
 342         {
 343             while (count > 0)
 344             {
 345                 memcpy( bits, src, min( count, width_bytes ) );
 346                 src += dib->dsBm.bmWidthBytes;
 347                 bits = (char *)bits + width_bytes;
 348                 count -= width_bytes;
 349             }
 350         }
 351         goto done;
 352     }
 353
 354     /* If the bits vector is null, the function should return the read size */
 355     if(bits == NULL)
 356     {
 357         ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
 358         goto done;
 359     }
 360
 361     if (count < 0) {
 362         WARN("(%d): Negative number of bytes passed???\n", count );
 363         count = -count;
 364     }
 365
 366     /* Only get entire lines */
 367     height = count / bmp->bitmap.bmWidthBytes;
 368     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 369     count = height * bmp->bitmap.bmWidthBytes;
 370     if (count == 0)
 371       {
 372         WARN("Less than one entire line requested\n");
 373         ret = 0;
 374         goto done;
 375       }
 376
 377
 378     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 379           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 380           1 << bmp->bitmap.bmBitsPixel, height );
 381
 382     if(bmp->funcs && bmp->funcs->pGetBitmapBits)
 383     {
 384         TRACE("Calling device specific BitmapBits\n");
 385         ret = bmp->funcs->pGetBitmapBits(hbitmap, bits, count);
 386     } else {
 387
 388         if(!bmp->bitmap.bmBits) {
 389             TRACE("Bitmap is empty\n");
 390             memset(bits, 0, count);
 391             ret = count;
 392         } else {
 393             memcpy(bits, bmp->bitmap.bmBits, count);
 394             ret = count;
 395         }
 396
 397     }
 398  done:
 399     GDI_ReleaseObj( hbitmap );
 400     return ret;
 401 }
 402
 403
 404 /******************************************************************************
 405  * SetBitmapBits [GDI32.@]
 406  *
 407  * Sets bits of color data for a bitmap.
 408  *
 409  * RETURNS
 410  *    Success: Number of bytes used in setting the bitmap bits
 411  *    Failure: 0
 412  */
 413 LONG WINAPI SetBitmapBits(
 414     HBITMAP hbitmap, /* [in] Handle to bitmap */
 415     LONG count,        /* [in] Number of bytes in bitmap array */
 416     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 417 {
 418     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 419     LONG height, ret;
 420
 421     if ((!bmp) || (!bits))
 422         return 0;
 423
 424     if (count < 0) {
 425         WARN("(%d): Negative number of bytes passed???\n", count );
 426         count = -count;
 427     }
 428
 429     if (bmp->dib)  /* simply copy the bits into the DIB */
 430     {
 431         DIBSECTION *dib = bmp->dib;
 432         char *dest = dib->dsBm.bmBits;
 433         DWORD max = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 434         if (count > max) count = max;
 435         ret = count;
 436
 437         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 438         {
 439             dest += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 440             while (count > 0)
 441             {
 442                 dest -= dib->dsBm.bmWidthBytes;
 443                 memcpy( dest, bits, min( count, dib->dsBm.bmWidthBytes ) );
 444                 bits = (const char *)bits + dib->dsBm.bmWidthBytes;
 445                 count -= dib->dsBm.bmWidthBytes;
 446             }
 447         }
 448         else memcpy( dest, bits, count );
 449
 450         GDI_ReleaseObj( hbitmap );
 451         return ret;
 452     }
 453
 454     /* Only get entire lines */
 455     height = count / bmp->bitmap.bmWidthBytes;
 456     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 457     count = height * bmp->bitmap.bmWidthBytes;
 458
 459     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 460           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 461           1 << bmp->bitmap.bmBitsPixel, height );
 462
 463     if(bmp->funcs && bmp->funcs->pSetBitmapBits) {
 464
 465         TRACE("Calling device specific BitmapBits\n");
 466         ret = bmp->funcs->pSetBitmapBits(hbitmap, bits, count);
 467     } else {
 468
 469         if(!bmp->bitmap.bmBits) /* Alloc enough for entire bitmap */
 470             bmp->bitmap.bmBits = HeapAlloc( GetProcessHeap(), 0, count );
 471         if(!bmp->bitmap.bmBits) {
 472             WARN("Unable to allocate bit buffer\n");
 473             ret = 0;
 474         } else {
 475             memcpy(bmp->bitmap.bmBits, bits, count);
 476             ret = count;
 477         }
 478     }
 479
 480     GDI_ReleaseObj( hbitmap );
 481     return ret;
 482 }
 483
 484 /**********************************************************************
 485  *              BITMAP_CopyBitmap
 486  *
 487  */
 488 HBITMAP BITMAP_CopyBitmap(HBITMAP hbitmap)
 489 {
 490     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 491     HBITMAP res = 0;
 492     BITMAP bm;
 493
 494     if(!bmp) return 0;
 495
 496     bm = bmp->bitmap;
 497     bm.bmBits = NULL;
 498     res = CreateBitmapIndirect(&bm);
 499
 500     if(res) {
 501         char *buf = HeapAlloc( GetProcessHeap(), 0, bm.bmWidthBytes *
 502                                bm.bmHeight );
 503         GetBitmapBits (hbitmap, bm.bmWidthBytes * bm.bmHeight, buf);
 504         SetBitmapBits (res, bm.bmWidthBytes * bm.bmHeight, buf);
 505         HeapFree( GetProcessHeap(), 0, buf );
 506     }
 507
 508     GDI_ReleaseObj( hbitmap );
 509     return res;
 510 }
 511
 512
 513 /***********************************************************************
 514  *           BITMAP_SetOwnerDC
 515  *
 516  * Set the type of DC that owns the bitmap. This is used when the
 517  * bitmap is selected into a device to initialize the bitmap function
 518  * table.
 519  */
 520 BOOL BITMAP_SetOwnerDC( HBITMAP hbitmap, DC *dc )
 521 {
 522     BITMAPOBJ *bitmap;
 523     BOOL ret;
 524
 525     /* never set the owner of the stock bitmap since it can be selected in multiple DCs */
 526     if (hbitmap == GetStockObject(DEFAULT_BITMAP)) return TRUE;
 527
 528     if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC ))) return FALSE;
 529
 530     ret = TRUE;
 531     if (!bitmap->funcs)  /* not owned by a DC yet */
 532     {
 533         if (dc->funcs->pCreateBitmap) ret = dc->funcs->pCreateBitmap( dc->physDev, hbitmap,
 534                                                                       bitmap->bitmap.bmBits );
 535         if (ret) bitmap->funcs = dc->funcs;
 536     }
 537     else if (bitmap->funcs != dc->funcs)
 538     {
 539         FIXME( "Trying to select bitmap %p in different DC type\n", hbitmap );
 540         ret = FALSE;
 541     }
 542     GDI_ReleaseObj( hbitmap );
 543     return ret;
 544 }
 545
 546
 547 /***********************************************************************
 548  *           BITMAP_SelectObject
 549  */
 550 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, void *obj, HDC hdc )
 551 {
 552     HGDIOBJ ret;
 553     BITMAPOBJ *bitmap = obj;
 554     DC *dc = DC_GetDCPtr( hdc );
 555
 556     if (!dc) return 0;
 557     if (GetObjectType( hdc ) != OBJ_MEMDC)
 558     {
 559         GDI_ReleaseObj( hdc );
 560         return 0;
 561     }
 562     ret = dc->hBitmap;
 563     if (handle == dc->hBitmap) goto done;  /* nothing to do */
 564
 565     if (bitmap->header.dwCount && (handle != GetStockObject(DEFAULT_BITMAP)))
 566     {
 567         WARN( "Bitmap already selected in another DC\n" );
 568         GDI_ReleaseObj( hdc );
 569         return 0;
 570     }
 571
 572     if (!bitmap->funcs && !BITMAP_SetOwnerDC( handle, dc ))
 573     {
 574         GDI_ReleaseObj( hdc );
 575         return 0;
 576     }
 577
 578     if (dc->funcs->pSelectBitmap) handle = dc->funcs->pSelectBitmap( dc->physDev, handle );
 579
 580     if (handle)
 581     {
 582         dc->hBitmap = handle;
 583         dc->flags &= ~DC_DIRTY;
 584         SetRectRgn( dc->hVisRgn, 0, 0, bitmap->bitmap.bmWidth, bitmap->bitmap.bmHeight);
 585         DC_InitDC( dc );
 586     }
 587     else ret = 0;
 588
 589  done:
 590     GDI_ReleaseObj( hdc );
 591     return ret;
 592 }
 593
 594
 595 /***********************************************************************
 596  *           BITMAP_DeleteObject
 597  */
 598 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj )
 599 {
 600     BITMAPOBJ * bmp = obj;
 601
 602     if (bmp->funcs && bmp->funcs->pDeleteBitmap)
 603         bmp->funcs->pDeleteBitmap( handle );
 604
 605     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 606
 607     if (bmp->dib)
 608     {
 609         DIBSECTION *dib = bmp->dib;
 610
 611         if (dib->dsBm.bmBits)
 612         {
 613             if (dib->dshSection)
 614             {
 615                 SYSTEM_INFO SystemInfo;
 616                 GetSystemInfo( &SystemInfo );
 617                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 618                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 619             }
 620             else if (!dib->dsOffset)
 621                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 622         }
 623         HeapFree(GetProcessHeap(), 0, dib);
 624         bmp->dib = NULL;
 625         if (bmp->segptr_bits)
 626         { /* free its selector array */
 627             WORD sel = SELECTOROF(bmp->segptr_bits);
 628             WORD count = (GetSelectorLimit16(sel) / 0x10000) + 1;
 629             int i;
 630
 631             for (i = 0; i < count; i++) FreeSelector16(sel + (i << __AHSHIFT));
 632         }
 633         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 634     }
 635     return GDI_FreeObject( handle, obj );
 636 }
 637
 638
 639 /***********************************************************************
 640  *           BITMAP_GetObject16
 641  */
 642 static INT BITMAP_GetObject16( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 643 {
 644     BITMAPOBJ *bmp = obj;
 645
 646     if (bmp->dib)
 647     {
 648         if ( count <= sizeof(BITMAP16) )
 649         {
 650             BITMAP *bmp32 = &bmp->dib->dsBm;
 651             BITMAP16 bmp16;
 652             bmp16.bmType       = bmp32->bmType;
 653             bmp16.bmWidth      = bmp32->bmWidth;
 654             bmp16.bmHeight     = bmp32->bmHeight;
 655             bmp16.bmWidthBytes = bmp32->bmWidthBytes;
 656             bmp16.bmPlanes     = bmp32->bmPlanes;
 657             bmp16.bmBitsPixel  = bmp32->bmBitsPixel;
 658             bmp16.bmBits       = (SEGPTR)0;
 659             memcpy( buffer, &bmp16, count );
 660             return count;
 661         }
 662         else
 663         {
 664             FIXME("not implemented for DIBs: count %d\n", count);
 665             return 0;
 666         }
 667     }
 668     else
 669     {
 670         BITMAP16 bmp16;
 671         bmp16.bmType       = bmp->bitmap.bmType;
 672         bmp16.bmWidth      = bmp->bitmap.bmWidth;
 673         bmp16.bmHeight     = bmp->bitmap.bmHeight;
 674         bmp16.bmWidthBytes = bmp->bitmap.bmWidthBytes;
 675         bmp16.bmPlanes     = bmp->bitmap.bmPlanes;
 676         bmp16.bmBitsPixel  = bmp->bitmap.bmBitsPixel;
 677         bmp16.bmBits       = (SEGPTR)0;
 678         if (count < sizeof(bmp16)) return 0;
 679         memcpy( buffer, &bmp16, sizeof(bmp16) );
 680         return sizeof(bmp16);
 681     }
 682 }
 683
 684
 685 /***********************************************************************
 686  *           BITMAP_GetObject
 687  */
 688 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 689 {
 690     BITMAPOBJ *bmp = obj;
 691
 692     if( !buffer ) return sizeof(BITMAP);
 693     if (count < sizeof(BITMAP)) return 0;
 694
 695     if (bmp->dib)
 696     {
 697         if (count >= sizeof(DIBSECTION))
 698         {
 699             memcpy( buffer, bmp->dib, sizeof(DIBSECTION) );
 700             return sizeof(DIBSECTION);
 701         }
 702         else /* if (count >= sizeof(BITMAP)) */
 703         {
 704             DIBSECTION *dib = bmp->dib;
 705             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 706             return sizeof(BITMAP);
 707         }
 708     }
 709     else
 710     {
 711         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 712         ((BITMAP *) buffer)->bmBits = NULL;
 713         return sizeof(BITMAP);
 714     }
 715 }
 716
 717
 718 /******************************************************************************
 719  * CreateDiscardableBitmap [GDI32.@]
 720  *
 721  * Creates a discardable bitmap.
 722  *
 723  * RETURNS
 724  *    Success: Handle to bitmap
 725  *    Failure: NULL
 726  */
 727 HBITMAP WINAPI CreateDiscardableBitmap(
 728     HDC hdc,    /* [in] Handle to device context */
 729     INT width,  /* [in] Bitmap width */
 730     INT height) /* [in] Bitmap height */
 731 {
 732     return CreateCompatibleBitmap( hdc, width, height );
 733 }
 734
 735
 736 /******************************************************************************
 737  * GetBitmapDimensionEx [GDI32.@]
 738  *
 739  * Retrieves dimensions of a bitmap.
 740  *
 741  * RETURNS
 742  *    Success: TRUE
 743  *    Failure: FALSE
 744  */
 745 BOOL WINAPI GetBitmapDimensionEx(
 746     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 747     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 748 {
 749     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 750     if (!bmp) return FALSE;
 751     *size = bmp->size;
 752     GDI_ReleaseObj( hbitmap );
 753     return TRUE;
 754 }
 755
 756
 757 /******************************************************************************
 758  * SetBitmapDimensionEx [GDI32.@]
 759  *
 760  * Assigns dimensions to a bitmap.
 761  * MSDN says that this function will fail if hbitmap is a handle created by
 762  * CreateDIBSection, but that's not true on Windows 2000.
 763  *
 764  * RETURNS
 765  *    Success: TRUE
 766  *    Failure: FALSE
 767  */
 768 BOOL WINAPI SetBitmapDimensionEx(
 769     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 770     INT x,           /* [in]  Bitmap width */
 771     INT y,           /* [in]  Bitmap height */
 772     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 773 {
 774     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 775     if (!bmp) return FALSE;
 776     if (prevSize) *prevSize = bmp->size;
 777     bmp->size.cx = x;
 778     bmp->size.cy = y;
 779     GDI_ReleaseObj( hbitmap );
 780     return TRUE;
 781 }