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)
 240     {
 241         SetLastError( ERROR_INVALID_PARAMETER );
 242         return NULL;
 243     }
 244
 245     bm = *bmp;
 246
 247     if (!bm.bmWidth || !bm.bmHeight)
 248     {
 249         return GetStockObject( DEFAULT_BITMAP );
 250     }
 251     else
 252     {
 253         if (bm.bmHeight < 0)
 254             bm.bmHeight = -bm.bmHeight;
 255         if (bm.bmWidth < 0)
 256             bm.bmWidth = -bm.bmWidth;
 257     }
 258
 259     if (bm.bmPlanes != 1)
 260     {
 261         FIXME("planes = %d\n", bm.bmPlanes);
 262         SetLastError( ERROR_INVALID_PARAMETER );
 263         return NULL;
 264     }
 265
 266     /* Windows ignores the provided bm.bmWidthBytes */
 267     bm.bmWidthBytes = BITMAP_GetWidthBytes( bm.bmWidth, bm.bmBitsPixel );
 268
 269       /* Create the BITMAPOBJ */
 270     bmpobj = GDI_AllocObject( sizeof(BITMAPOBJ), BITMAP_MAGIC,
 271                               (HGDIOBJ *)&hbitmap, &bitmap_funcs );
 272
 273     if (!bmpobj)
 274     {
 275         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 276         return NULL;
 277     }
 278
 279     TRACE("%dx%d, %d colors returning %p\n", bm.bmWidth, bm.bmHeight,
 280           1 << (bm.bmPlanes * bm.bmBitsPixel), hbitmap);
 281
 282     bmpobj->size.cx = 0;
 283     bmpobj->size.cy = 0;
 284     bmpobj->bitmap = bm;
 285     bmpobj->bitmap.bmBits = NULL;
 286     bmpobj->funcs = NULL;
 287     bmpobj->dib = NULL;
 288     bmpobj->segptr_bits = 0;
 289     bmpobj->color_table = NULL;
 290     bmpobj->nb_colors = 0;
 291
 292     if (bm.bmBits)
 293         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 294
 295     GDI_ReleaseObj( hbitmap );
 296     return hbitmap;
 297 }
 298
 299
 300 /***********************************************************************
 301  * GetBitmapBits [GDI32.@]
 302  *
 303  * Copies bitmap bits of bitmap to buffer.
 304  *
 305  * RETURNS
 306  *    Success: Number of bytes copied
 307  *    Failure: 0
 308  */
 309 LONG WINAPI GetBitmapBits(
 310     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 311     LONG count,        /* [in]  Number of bytes to copy */
 312     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 313 {
 314     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 315     LONG height, ret;
 316
 317     if (!bmp) return 0;
 318
 319     if (bmp->dib)  /* simply copy the bits from the DIB */
 320     {
 321         DIBSECTION *dib = bmp->dib;
 322         const char *src = dib->dsBm.bmBits;
 323         INT width_bytes = BITMAP_GetWidthBytes(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
 324         DWORD max = width_bytes * bmp->bitmap.bmHeight;
 325
 326         if (!bits)
 327         {
 328             ret = max;
 329             goto done;
 330         }
 331
 332         if (count > max) count = max;
 333         ret = count;
 334
 335         /* GetBitmapBits returns not 32-bit aligned data */
 336
 337         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 338         {
 339             src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 340             while (count > 0)
 341             {
 342                 src -= dib->dsBm.bmWidthBytes;
 343                 memcpy( bits, src, min( count, width_bytes ) );
 344                 bits = (char *)bits + width_bytes;
 345                 count -= width_bytes;
 346             }
 347         }
 348         else
 349         {
 350             while (count > 0)
 351             {
 352                 memcpy( bits, src, min( count, width_bytes ) );
 353                 src += dib->dsBm.bmWidthBytes;
 354                 bits = (char *)bits + width_bytes;
 355                 count -= width_bytes;
 356             }
 357         }
 358         goto done;
 359     }
 360
 361     /* If the bits vector is null, the function should return the read size */
 362     if(bits == NULL)
 363     {
 364         ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
 365         goto done;
 366     }
 367
 368     if (count < 0) {
 369         WARN("(%d): Negative number of bytes passed???\n", count );
 370         count = -count;
 371     }
 372
 373     /* Only get entire lines */
 374     height = count / bmp->bitmap.bmWidthBytes;
 375     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 376     count = height * bmp->bitmap.bmWidthBytes;
 377     if (count == 0)
 378       {
 379         WARN("Less than one entire line requested\n");
 380         ret = 0;
 381         goto done;
 382       }
 383
 384
 385     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 386           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 387           1 << bmp->bitmap.bmBitsPixel, height );
 388
 389     if(bmp->funcs && bmp->funcs->pGetBitmapBits)
 390     {
 391         TRACE("Calling device specific BitmapBits\n");
 392         ret = bmp->funcs->pGetBitmapBits(hbitmap, bits, count);
 393     } else {
 394
 395         if(!bmp->bitmap.bmBits) {
 396             TRACE("Bitmap is empty\n");
 397             memset(bits, 0, count);
 398             ret = count;
 399         } else {
 400             memcpy(bits, bmp->bitmap.bmBits, count);
 401             ret = count;
 402         }
 403
 404     }
 405  done:
 406     GDI_ReleaseObj( hbitmap );
 407     return ret;
 408 }
 409
 410
 411 /******************************************************************************
 412  * SetBitmapBits [GDI32.@]
 413  *
 414  * Sets bits of color data for a bitmap.
 415  *
 416  * RETURNS
 417  *    Success: Number of bytes used in setting the bitmap bits
 418  *    Failure: 0
 419  */
 420 LONG WINAPI SetBitmapBits(
 421     HBITMAP hbitmap, /* [in] Handle to bitmap */
 422     LONG count,        /* [in] Number of bytes in bitmap array */
 423     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 424 {
 425     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 426     LONG height, ret;
 427
 428     if ((!bmp) || (!bits))
 429         return 0;
 430
 431     if (count < 0) {
 432         WARN("(%d): Negative number of bytes passed???\n", count );
 433         count = -count;
 434     }
 435
 436     if (bmp->dib)  /* simply copy the bits into the DIB */
 437     {
 438         DIBSECTION *dib = bmp->dib;
 439         char *dest = dib->dsBm.bmBits;
 440         DWORD max = dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 441         if (count > max) count = max;
 442         ret = count;
 443
 444         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 445         {
 446             dest += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 447             while (count > 0)
 448             {
 449                 dest -= dib->dsBm.bmWidthBytes;
 450                 memcpy( dest, bits, min( count, dib->dsBm.bmWidthBytes ) );
 451                 bits = (const char *)bits + dib->dsBm.bmWidthBytes;
 452                 count -= dib->dsBm.bmWidthBytes;
 453             }
 454         }
 455         else memcpy( dest, bits, count );
 456
 457         GDI_ReleaseObj( hbitmap );
 458         return ret;
 459     }
 460
 461     /* Only get entire lines */
 462     height = count / bmp->bitmap.bmWidthBytes;
 463     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 464     count = height * bmp->bitmap.bmWidthBytes;
 465
 466     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 467           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 468           1 << bmp->bitmap.bmBitsPixel, height );
 469
 470     if(bmp->funcs && bmp->funcs->pSetBitmapBits) {
 471
 472         TRACE("Calling device specific BitmapBits\n");
 473         ret = bmp->funcs->pSetBitmapBits(hbitmap, bits, count);
 474     } else {
 475
 476         if(!bmp->bitmap.bmBits) /* Alloc enough for entire bitmap */
 477             bmp->bitmap.bmBits = HeapAlloc( GetProcessHeap(), 0, count );
 478         if(!bmp->bitmap.bmBits) {
 479             WARN("Unable to allocate bit buffer\n");
 480             ret = 0;
 481         } else {
 482             memcpy(bmp->bitmap.bmBits, bits, count);
 483             ret = count;
 484         }
 485     }
 486
 487     GDI_ReleaseObj( hbitmap );
 488     return ret;
 489 }
 490
 491 /**********************************************************************
 492  *              BITMAP_CopyBitmap
 493  *
 494  */
 495 HBITMAP BITMAP_CopyBitmap(HBITMAP hbitmap)
 496 {
 497     BITMAPOBJ *bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 498     HBITMAP res = 0;
 499     BITMAP bm;
 500
 501     if(!bmp) return 0;
 502
 503     bm = bmp->bitmap;
 504     bm.bmBits = NULL;
 505     res = CreateBitmapIndirect(&bm);
 506
 507     if(res) {
 508         char *buf = HeapAlloc( GetProcessHeap(), 0, bm.bmWidthBytes *
 509                                bm.bmHeight );
 510         GetBitmapBits (hbitmap, bm.bmWidthBytes * bm.bmHeight, buf);
 511         SetBitmapBits (res, bm.bmWidthBytes * bm.bmHeight, buf);
 512         HeapFree( GetProcessHeap(), 0, buf );
 513     }
 514
 515     GDI_ReleaseObj( hbitmap );
 516     return res;
 517 }
 518
 519
 520 /***********************************************************************
 521  *           BITMAP_SetOwnerDC
 522  *
 523  * Set the type of DC that owns the bitmap. This is used when the
 524  * bitmap is selected into a device to initialize the bitmap function
 525  * table.
 526  */
 527 BOOL BITMAP_SetOwnerDC( HBITMAP hbitmap, DC *dc )
 528 {
 529     BITMAPOBJ *bitmap;
 530     BOOL ret;
 531
 532     /* never set the owner of the stock bitmap since it can be selected in multiple DCs */
 533     if (hbitmap == GetStockObject(DEFAULT_BITMAP)) return TRUE;
 534
 535     if (!(bitmap = GDI_GetObjPtr( hbitmap, BITMAP_MAGIC ))) return FALSE;
 536
 537     ret = TRUE;
 538     if (!bitmap->funcs)  /* not owned by a DC yet */
 539     {
 540         if (dc->funcs->pCreateBitmap) ret = dc->funcs->pCreateBitmap( dc->physDev, hbitmap,
 541                                                                       bitmap->bitmap.bmBits );
 542         if (ret) bitmap->funcs = dc->funcs;
 543     }
 544     else if (bitmap->funcs != dc->funcs)
 545     {
 546         FIXME( "Trying to select bitmap %p in different DC type\n", hbitmap );
 547         ret = FALSE;
 548     }
 549     GDI_ReleaseObj( hbitmap );
 550     return ret;
 551 }
 552
 553
 554 /***********************************************************************
 555  *           BITMAP_SelectObject
 556  */
 557 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, void *obj, HDC hdc )
 558 {
 559     HGDIOBJ ret;
 560     BITMAPOBJ *bitmap = obj;
 561     DC *dc = DC_GetDCPtr( hdc );
 562
 563     if (!dc) return 0;
 564     if (GetObjectType( hdc ) != OBJ_MEMDC)
 565     {
 566         GDI_ReleaseObj( hdc );
 567         return 0;
 568     }
 569     ret = dc->hBitmap;
 570     if (handle == dc->hBitmap) goto done;  /* nothing to do */
 571
 572     if (bitmap->header.dwCount && (handle != GetStockObject(DEFAULT_BITMAP)))
 573     {
 574         WARN( "Bitmap already selected in another DC\n" );
 575         GDI_ReleaseObj( hdc );
 576         return 0;
 577     }
 578
 579     if (!bitmap->funcs && !BITMAP_SetOwnerDC( handle, dc ))
 580     {
 581         GDI_ReleaseObj( hdc );
 582         return 0;
 583     }
 584
 585     if (dc->funcs->pSelectBitmap) handle = dc->funcs->pSelectBitmap( dc->physDev, handle );
 586
 587     if (handle)
 588     {
 589         dc->hBitmap = handle;
 590         dc->flags &= ~DC_DIRTY;
 591         SetRectRgn( dc->hVisRgn, 0, 0, bitmap->bitmap.bmWidth, bitmap->bitmap.bmHeight);
 592         DC_InitDC( dc );
 593     }
 594     else ret = 0;
 595
 596  done:
 597     GDI_ReleaseObj( hdc );
 598     return ret;
 599 }
 600
 601
 602 /***********************************************************************
 603  *           BITMAP_DeleteObject
 604  */
 605 static BOOL BITMAP_DeleteObject( HGDIOBJ handle, void *obj )
 606 {
 607     BITMAPOBJ * bmp = obj;
 608
 609     if (bmp->funcs && bmp->funcs->pDeleteBitmap)
 610         bmp->funcs->pDeleteBitmap( handle );
 611
 612     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 613
 614     if (bmp->dib)
 615     {
 616         DIBSECTION *dib = bmp->dib;
 617
 618         if (dib->dsBm.bmBits)
 619         {
 620             if (dib->dshSection)
 621             {
 622                 SYSTEM_INFO SystemInfo;
 623                 GetSystemInfo( &SystemInfo );
 624                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 625                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 626             }
 627             else if (!dib->dsOffset)
 628                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 629         }
 630         HeapFree(GetProcessHeap(), 0, dib);
 631         bmp->dib = NULL;
 632         if (bmp->segptr_bits)
 633         { /* free its selector array */
 634             WORD sel = SELECTOROF(bmp->segptr_bits);
 635             WORD count = (GetSelectorLimit16(sel) / 0x10000) + 1;
 636             int i;
 637
 638             for (i = 0; i < count; i++) FreeSelector16(sel + (i << __AHSHIFT));
 639         }
 640         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 641     }
 642     return GDI_FreeObject( handle, obj );
 643 }
 644
 645
 646 /***********************************************************************
 647  *           BITMAP_GetObject16
 648  */
 649 static INT BITMAP_GetObject16( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 650 {
 651     BITMAPOBJ *bmp = obj;
 652
 653     if (bmp->dib)
 654     {
 655         if ( count <= sizeof(BITMAP16) )
 656         {
 657             BITMAP *bmp32 = &bmp->dib->dsBm;
 658             BITMAP16 bmp16;
 659             bmp16.bmType       = bmp32->bmType;
 660             bmp16.bmWidth      = bmp32->bmWidth;
 661             bmp16.bmHeight     = bmp32->bmHeight;
 662             bmp16.bmWidthBytes = bmp32->bmWidthBytes;
 663             bmp16.bmPlanes     = bmp32->bmPlanes;
 664             bmp16.bmBitsPixel  = bmp32->bmBitsPixel;
 665             bmp16.bmBits       = (SEGPTR)0;
 666             memcpy( buffer, &bmp16, count );
 667             return count;
 668         }
 669         else
 670         {
 671             FIXME("not implemented for DIBs: count %d\n", count);
 672             return 0;
 673         }
 674     }
 675     else
 676     {
 677         BITMAP16 bmp16;
 678         bmp16.bmType       = bmp->bitmap.bmType;
 679         bmp16.bmWidth      = bmp->bitmap.bmWidth;
 680         bmp16.bmHeight     = bmp->bitmap.bmHeight;
 681         bmp16.bmWidthBytes = bmp->bitmap.bmWidthBytes;
 682         bmp16.bmPlanes     = bmp->bitmap.bmPlanes;
 683         bmp16.bmBitsPixel  = bmp->bitmap.bmBitsPixel;
 684         bmp16.bmBits       = (SEGPTR)0;
 685         if (count < sizeof(bmp16)) return 0;
 686         memcpy( buffer, &bmp16, sizeof(bmp16) );
 687         return sizeof(bmp16);
 688     }
 689 }
 690
 691
 692 /***********************************************************************
 693  *           BITMAP_GetObject
 694  */
 695 static INT BITMAP_GetObject( HGDIOBJ handle, void *obj, INT count, LPVOID buffer )
 696 {
 697     BITMAPOBJ *bmp = obj;
 698
 699     if( !buffer ) return sizeof(BITMAP);
 700     if (count < sizeof(BITMAP)) return 0;
 701
 702     if (bmp->dib)
 703     {
 704         if (count >= sizeof(DIBSECTION))
 705         {
 706             memcpy( buffer, bmp->dib, sizeof(DIBSECTION) );
 707             return sizeof(DIBSECTION);
 708         }
 709         else /* if (count >= sizeof(BITMAP)) */
 710         {
 711             DIBSECTION *dib = bmp->dib;
 712             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 713             return sizeof(BITMAP);
 714         }
 715     }
 716     else
 717     {
 718         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 719         ((BITMAP *) buffer)->bmBits = NULL;
 720         return sizeof(BITMAP);
 721     }
 722 }
 723
 724
 725 /******************************************************************************
 726  * CreateDiscardableBitmap [GDI32.@]
 727  *
 728  * Creates a discardable bitmap.
 729  *
 730  * RETURNS
 731  *    Success: Handle to bitmap
 732  *    Failure: NULL
 733  */
 734 HBITMAP WINAPI CreateDiscardableBitmap(
 735     HDC hdc,    /* [in] Handle to device context */
 736     INT width,  /* [in] Bitmap width */
 737     INT height) /* [in] Bitmap height */
 738 {
 739     return CreateCompatibleBitmap( hdc, width, height );
 740 }
 741
 742
 743 /******************************************************************************
 744  * GetBitmapDimensionEx [GDI32.@]
 745  *
 746  * Retrieves dimensions of a bitmap.
 747  *
 748  * RETURNS
 749  *    Success: TRUE
 750  *    Failure: FALSE
 751  */
 752 BOOL WINAPI GetBitmapDimensionEx(
 753     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 754     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 755 {
 756     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 757     if (!bmp) return FALSE;
 758     *size = bmp->size;
 759     GDI_ReleaseObj( hbitmap );
 760     return TRUE;
 761 }
 762
 763
 764 /******************************************************************************
 765  * SetBitmapDimensionEx [GDI32.@]
 766  *
 767  * Assigns dimensions to a bitmap.
 768  * MSDN says that this function will fail if hbitmap is a handle created by
 769  * CreateDIBSection, but that's not true on Windows 2000.
 770  *
 771  * RETURNS
 772  *    Success: TRUE
 773  *    Failure: FALSE
 774  */
 775 BOOL WINAPI SetBitmapDimensionEx(
 776     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 777     INT x,           /* [in]  Bitmap width */
 778     INT y,           /* [in]  Bitmap height */
 779     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 780 {
 781     BITMAPOBJ * bmp = (BITMAPOBJ *) GDI_GetObjPtr( hbitmap, BITMAP_MAGIC );
 782     if (!bmp) return FALSE;
 783     if (prevSize) *prevSize = bmp->size;
 784     bmp->size.cx = x;
 785     bmp->size.cy = y;
 786     GDI_ReleaseObj( hbitmap );
 787     return TRUE;
 788 }