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