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 "gdi_private.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(bitmap);
  33
  34
  35 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, HDC hdc );
  36 static INT BITMAP_GetObject( HGDIOBJ handle, INT count, LPVOID buffer );
  37 static BOOL BITMAP_DeleteObject( HGDIOBJ handle );
  38
  39 static const struct gdi_obj_funcs bitmap_funcs =
  40 {
  41     BITMAP_SelectObject,  /* pSelectObject */
  42     BITMAP_GetObject,     /* pGetObjectA */
  43     BITMAP_GetObject,     /* pGetObjectW */
  44     NULL,                 /* pUnrealizeObject */
  45     BITMAP_DeleteObject   /* pDeleteObject */
  46 };
  47
  48 /***********************************************************************
  49  *           BITMAP_GetWidthBytes
  50  *
  51  * Return number of bytes taken by a scanline of 16-bit aligned Windows DDB
  52  * data.
  53  */
  54 INT BITMAP_GetWidthBytes( INT bmWidth, INT bpp )
  55 {
  56     switch(bpp)
  57     {
  58     case 1:
  59         return 2 * ((bmWidth+15) >> 4);
  60
  61     case 24:
  62         bmWidth *= 3; /* fall through */
  63     case 8:
  64         return bmWidth + (bmWidth & 1);
  65
  66     case 32:
  67         return bmWidth * 4;
  68
  69     case 16:
  70     case 15:
  71         return bmWidth * 2;
  72
  73     case 4:
  74         return 2 * ((bmWidth+3) >> 2);
  75
  76     default:
  77         WARN("Unknown depth %d, please report.\n", bpp );
  78     }
  79     return -1;
  80 }
  81
  82
  83 /******************************************************************************
  84  * CreateBitmap [GDI32.@]
  85  *
  86  * Creates a bitmap with the specified info.
  87  *
  88  * PARAMS
  89  *    width  [I] bitmap width
  90  *    height [I] bitmap height
  91  *    planes [I] Number of color planes
  92  *    bpp    [I] Number of bits to identify a color
  93  *    bits   [I] Pointer to array containing color data
  94  *
  95  * RETURNS
  96  *    Success: Handle to bitmap
  97  *    Failure: 0
  98  */
  99 HBITMAP WINAPI CreateBitmap( INT width, INT height, UINT planes,
 100                              UINT bpp, LPCVOID bits )
 101 {
 102     BITMAP bm;
 103
 104     bm.bmType = 0;
 105     bm.bmWidth = width;
 106     bm.bmHeight = height;
 107     bm.bmWidthBytes = BITMAP_GetWidthBytes( width, bpp );
 108     bm.bmPlanes = planes;
 109     bm.bmBitsPixel = bpp;
 110     bm.bmBits = (LPVOID)bits;
 111
 112     return CreateBitmapIndirect( &bm );
 113 }
 114
 115 /******************************************************************************
 116  * CreateCompatibleBitmap [GDI32.@]
 117  *
 118  * Creates a bitmap compatible with the DC.
 119  *
 120  * PARAMS
 121  *    hdc    [I] Handle to device context
 122  *    width  [I] Width of bitmap
 123  *    height [I] Height of bitmap
 124  *
 125  * RETURNS
 126  *    Success: Handle to bitmap
 127  *    Failure: 0
 128  */
 129 HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height)
 130 {
 131     HBITMAP hbmpRet = 0;
 132
 133     TRACE("(%p,%d,%d) =\n", hdc, width, height);
 134
 135     if (GetObjectType( hdc ) != OBJ_MEMDC)
 136     {
 137         hbmpRet = CreateBitmap(width, height,
 138                                GetDeviceCaps(hdc, PLANES),
 139                                GetDeviceCaps(hdc, BITSPIXEL),
 140                                NULL);
 141     }
 142     else  /* Memory DC */
 143     {
 144         DIBSECTION dib;
 145         HBITMAP bitmap = GetCurrentObject( hdc, OBJ_BITMAP );
 146         INT size = GetObjectW( bitmap, sizeof(dib), &dib );
 147
 148         if (!size) return 0;
 149
 150         if (size == sizeof(BITMAP))
 151         {
 152             /* A device-dependent bitmap is selected in the DC */
 153             hbmpRet = CreateBitmap(width, height,
 154                                    dib.dsBm.bmPlanes,
 155                                    dib.dsBm.bmBitsPixel,
 156                                    NULL);
 157         }
 158         else
 159         {
 160             /* A DIB section is selected in the DC */
 161             BITMAPINFO *bi;
 162             void *bits;
 163
 164             /* Allocate memory for a BITMAPINFOHEADER structure and a
 165                color table. The maximum number of colors in a color table
 166                is 256 which corresponds to a bitmap with depth 8.
 167                Bitmaps with higher depths don't have color tables. */
 168             bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 169
 170             if (bi)
 171             {
 172                 bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
 173                 bi->bmiHeader.biWidth         = width;
 174                 bi->bmiHeader.biHeight        = height;
 175                 bi->bmiHeader.biPlanes        = dib.dsBmih.biPlanes;
 176                 bi->bmiHeader.biBitCount      = dib.dsBmih.biBitCount;
 177                 bi->bmiHeader.biCompression   = dib.dsBmih.biCompression;
 178                 bi->bmiHeader.biSizeImage     = 0;
 179                 bi->bmiHeader.biXPelsPerMeter = dib.dsBmih.biXPelsPerMeter;
 180                 bi->bmiHeader.biYPelsPerMeter = dib.dsBmih.biYPelsPerMeter;
 181                 bi->bmiHeader.biClrUsed       = dib.dsBmih.biClrUsed;
 182                 bi->bmiHeader.biClrImportant  = dib.dsBmih.biClrImportant;
 183
 184                 if (bi->bmiHeader.biCompression == BI_BITFIELDS)
 185                 {
 186                     /* Copy the color masks */
 187                     CopyMemory(bi->bmiColors, dib.dsBitfields, 3 * sizeof(DWORD));
 188                 }
 189                 else if (bi->bmiHeader.biBitCount <= 8)
 190                 {
 191                     /* Copy the color table */
 192                     GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
 193                 }
 194
 195                 hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
 196                 HeapFree(GetProcessHeap(), 0, bi);
 197             }
 198         }
 199     }
 200
 201     TRACE("\t\t%p\n", hbmpRet);
 202     return hbmpRet;
 203 }
 204
 205
 206 /******************************************************************************
 207  * CreateBitmapIndirect [GDI32.@]
 208  *
 209  * Creates a bitmap with the specified info.
 210  *
 211  * PARAMS
 212  *  bmp [I] Pointer to the bitmap info describing the bitmap
 213  *
 214  * RETURNS
 215  *    Success: Handle to bitmap
 216  *    Failure: NULL. Use GetLastError() to determine the cause.
 217  *
 218  * NOTES
 219  *  If a width or height of 0 are given, a 1x1 monochrome bitmap is returned.
 220  */
 221 HBITMAP WINAPI CreateBitmapIndirect( const BITMAP *bmp )
 222 {
 223     BITMAP bm;
 224     BITMAPOBJ *bmpobj;
 225     HBITMAP hbitmap;
 226
 227     if (!bmp || bmp->bmType)
 228     {
 229         SetLastError( ERROR_INVALID_PARAMETER );
 230         return NULL;
 231     }
 232
 233     if (bmp->bmWidth > 0x7ffffff || bmp->bmHeight > 0x7ffffff)
 234     {
 235         SetLastError( ERROR_INVALID_PARAMETER );
 236         return 0;
 237     }
 238
 239     bm = *bmp;
 240
 241     if (!bm.bmWidth || !bm.bmHeight)
 242     {
 243         return GetStockObject( DEFAULT_BITMAP );
 244     }
 245     else
 246     {
 247         if (bm.bmHeight < 0)
 248             bm.bmHeight = -bm.bmHeight;
 249         if (bm.bmWidth < 0)
 250             bm.bmWidth = -bm.bmWidth;
 251     }
 252
 253     if (bm.bmPlanes != 1)
 254     {
 255         FIXME("planes = %d\n", bm.bmPlanes);
 256         SetLastError( ERROR_INVALID_PARAMETER );
 257         return NULL;
 258     }
 259
 260     /* Windows only uses 1, 4, 8, 16, 24 and 32 bpp */
 261     if(bm.bmBitsPixel == 1)         bm.bmBitsPixel = 1;
 262     else if(bm.bmBitsPixel <= 4)    bm.bmBitsPixel = 4;
 263     else if(bm.bmBitsPixel <= 8)    bm.bmBitsPixel = 8;
 264     else if(bm.bmBitsPixel <= 16)   bm.bmBitsPixel = 16;
 265     else if(bm.bmBitsPixel <= 24)   bm.bmBitsPixel = 24;
 266     else if(bm.bmBitsPixel <= 32)   bm.bmBitsPixel = 32;
 267     else {
 268         WARN("Invalid bmBitsPixel %d, returning ERROR_INVALID_PARAMETER\n", bm.bmBitsPixel);
 269         SetLastError(ERROR_INVALID_PARAMETER);
 270         return NULL;
 271     }
 272
 273     /* Windows ignores the provided bm.bmWidthBytes */
 274     bm.bmWidthBytes = BITMAP_GetWidthBytes( bm.bmWidth, bm.bmBitsPixel );
 275     /* XP doesn't allow to create bitmaps larger than 128 Mb */
 276     if (bm.bmHeight > 128 * 1024 * 1024 / bm.bmWidthBytes)
 277     {
 278         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 279         return 0;
 280     }
 281
 282     /* Create the BITMAPOBJ */
 283     if (!(bmpobj = HeapAlloc( GetProcessHeap(), 0, sizeof(*bmpobj) )))
 284     {
 285         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 286         return 0;
 287     }
 288
 289     bmpobj->size.cx = 0;
 290     bmpobj->size.cy = 0;
 291     bmpobj->bitmap = bm;
 292     bmpobj->bitmap.bmBits = NULL;
 293     bmpobj->funcs = NULL;
 294     bmpobj->dib = NULL;
 295     bmpobj->color_table = NULL;
 296     bmpobj->nb_colors = 0;
 297
 298     if (!(hbitmap = alloc_gdi_handle( &bmpobj->header, OBJ_BITMAP, &bitmap_funcs )))
 299     {
 300         HeapFree( GetProcessHeap(), 0, bmpobj );
 301         return 0;
 302     }
 303
 304     if (bm.bmBits)
 305         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 306
 307     TRACE("%dx%d, %d colors returning %p\n", bm.bmWidth, bm.bmHeight,
 308           1 << (bm.bmPlanes * bm.bmBitsPixel), hbitmap);
 309
 310     return hbitmap;
 311 }
 312
 313
 314 /***********************************************************************
 315  * GetBitmapBits [GDI32.@]
 316  *
 317  * Copies bitmap bits of bitmap to buffer.
 318  *
 319  * RETURNS
 320  *    Success: Number of bytes copied
 321  *    Failure: 0
 322  */
 323 LONG WINAPI GetBitmapBits(
 324     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 325     LONG count,        /* [in]  Number of bytes to copy */
 326     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 327 {
 328     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 329     LONG height, ret;
 330
 331     if (!bmp) return 0;
 332
 333     if (bmp->dib)  /* simply copy the bits from the DIB */
 334     {
 335         DIBSECTION *dib = bmp->dib;
 336         const char *src = dib->dsBm.bmBits;
 337         INT width_bytes = BITMAP_GetWidthBytes(dib->dsBm.bmWidth, dib->dsBm.bmBitsPixel);
 338         LONG max = width_bytes * bmp->bitmap.bmHeight;
 339
 340         if (!bits)
 341         {
 342             ret = max;
 343             goto done;
 344         }
 345
 346         if (count > max) count = max;
 347         ret = count;
 348
 349         /* GetBitmapBits returns not 32-bit aligned data */
 350
 351         if (bmp->dib->dsBmih.biHeight >= 0)  /* not top-down, need to flip contents vertically */
 352         {
 353             src += dib->dsBm.bmWidthBytes * dib->dsBm.bmHeight;
 354             while (count > 0)
 355             {
 356                 src -= dib->dsBm.bmWidthBytes;
 357                 memcpy( bits, src, min( count, width_bytes ) );
 358                 bits = (char *)bits + width_bytes;
 359                 count -= width_bytes;
 360             }
 361         }
 362         else
 363         {
 364             while (count > 0)
 365             {
 366                 memcpy( bits, src, min( count, width_bytes ) );
 367                 src += dib->dsBm.bmWidthBytes;
 368                 bits = (char *)bits + width_bytes;
 369                 count -= width_bytes;
 370             }
 371         }
 372         goto done;
 373     }
 374
 375     /* If the bits vector is null, the function should return the read size */
 376     if(bits == NULL)
 377     {
 378         ret = bmp->bitmap.bmWidthBytes * bmp->bitmap.bmHeight;
 379         goto done;
 380     }
 381
 382     if (count < 0) {
 383         WARN("(%d): Negative number of bytes passed???\n", count );
 384         count = -count;
 385     }
 386
 387     /* Only get entire lines */
 388     height = count / bmp->bitmap.bmWidthBytes;
 389     if (height > bmp->bitmap.bmHeight) height = bmp->bitmap.bmHeight;
 390     count = height * bmp->bitmap.bmWidthBytes;
 391     if (count == 0)
 392       {
 393         WARN("Less than one entire line requested\n");
 394         ret = 0;
 395         goto done;
 396       }
 397
 398
 399     TRACE("(%p, %d, %p) %dx%d %d colors fetched height: %d\n",
 400           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 401           1 << bmp->bitmap.bmBitsPixel, height );
 402
 403     if(bmp->funcs && bmp->funcs->pGetBitmapBits)
 404     {
 405         TRACE("Calling device specific BitmapBits\n");
 406         ret = bmp->funcs->pGetBitmapBits(hbitmap, bits, count);
 407     } else {
 408
 409         if(!bmp->bitmap.bmBits) {
 410             TRACE("Bitmap is empty\n");
 411             memset(bits, 0, count);
 412             ret = count;
 413         } else {
 414             memcpy(bits, bmp->bitmap.bmBits, count);
 415             ret = count;
 416         }
 417
 418     }
 419  done:
 420     GDI_ReleaseObj( hbitmap );
 421     return ret;
 422 }
 423
 424
 425 /******************************************************************************
 426  * SetBitmapBits [GDI32.@]
 427  *
 428  * Sets bits of color data for a bitmap.
 429  *
 430  * RETURNS
 431  *    Success: Number of bytes used in setting the bitmap bits
 432  *    Failure: 0
 433  */
 434 LONG WINAPI SetBitmapBits(
 435     HBITMAP hbitmap, /* [in] Handle to bitmap */
 436     LONG count,        /* [in] Number of bytes in bitmap array */
 437     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 438 {
 439     BITMAPOBJ *bmp;
 440     LONG height, ret;
 441
 442     if (!bits) return 0;
 443
 444     bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 445     if (!bmp) 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         LONG 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, OBJ_BITMAP ))) 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, OBJ_BITMAP )))
 584     {
 585         ret = 0;
 586         goto done;
 587     }
 588
 589     if (bitmap->header.selcount && (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 )
 630 {
 631     const DC_FUNCTIONS *funcs;
 632     BITMAPOBJ *bmp = GDI_GetObjPtr( handle, OBJ_BITMAP );
 633
 634     if (!bmp) return FALSE;
 635     funcs = bmp->funcs;
 636     GDI_ReleaseObj( handle );
 637
 638     if (funcs && funcs->pDeleteBitmap) funcs->pDeleteBitmap( handle );
 639
 640     if (!(bmp = free_gdi_handle( handle ))) return FALSE;
 641
 642     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 643
 644     if (bmp->dib)
 645     {
 646         DIBSECTION *dib = bmp->dib;
 647
 648         if (dib->dsBm.bmBits)
 649         {
 650             if (dib->dshSection)
 651             {
 652                 SYSTEM_INFO SystemInfo;
 653                 GetSystemInfo( &SystemInfo );
 654                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 655                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 656             }
 657             else if (!dib->dsOffset)
 658                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 659         }
 660         HeapFree(GetProcessHeap(), 0, dib);
 661         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 662     }
 663     return HeapFree( GetProcessHeap(), 0, bmp );
 664 }
 665
 666
 667 /***********************************************************************
 668  *           BITMAP_GetObject
 669  */
 670 static INT BITMAP_GetObject( HGDIOBJ handle, INT count, LPVOID buffer )
 671 {
 672     INT ret;
 673     BITMAPOBJ *bmp = GDI_GetObjPtr( handle, OBJ_BITMAP );
 674
 675     if (!bmp) return 0;
 676
 677     if (!buffer) ret = sizeof(BITMAP);
 678     else if (count < sizeof(BITMAP)) ret = 0;
 679     else if (bmp->dib)
 680     {
 681         if (count >= sizeof(DIBSECTION))
 682         {
 683             DIBSECTION *dib = buffer;
 684             *dib = *bmp->dib;
 685             dib->dsBmih.biHeight = abs( dib->dsBmih.biHeight );
 686             ret = sizeof(DIBSECTION);
 687         }
 688         else /* if (count >= sizeof(BITMAP)) */
 689         {
 690             DIBSECTION *dib = bmp->dib;
 691             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 692             ret = sizeof(BITMAP);
 693         }
 694     }
 695     else
 696     {
 697         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 698         ((BITMAP *) buffer)->bmBits = NULL;
 699         ret = sizeof(BITMAP);
 700     }
 701     GDI_ReleaseObj( handle );
 702     return ret;
 703 }
 704
 705
 706 /******************************************************************************
 707  * CreateDiscardableBitmap [GDI32.@]
 708  *
 709  * Creates a discardable bitmap.
 710  *
 711  * RETURNS
 712  *    Success: Handle to bitmap
 713  *    Failure: NULL
 714  */
 715 HBITMAP WINAPI CreateDiscardableBitmap(
 716     HDC hdc,    /* [in] Handle to device context */
 717     INT width,  /* [in] Bitmap width */
 718     INT height) /* [in] Bitmap height */
 719 {
 720     return CreateCompatibleBitmap( hdc, width, height );
 721 }
 722
 723
 724 /******************************************************************************
 725  * GetBitmapDimensionEx [GDI32.@]
 726  *
 727  * Retrieves dimensions of a bitmap.
 728  *
 729  * RETURNS
 730  *    Success: TRUE
 731  *    Failure: FALSE
 732  */
 733 BOOL WINAPI GetBitmapDimensionEx(
 734     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 735     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 736 {
 737     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 738     if (!bmp) return FALSE;
 739     *size = bmp->size;
 740     GDI_ReleaseObj( hbitmap );
 741     return TRUE;
 742 }
 743
 744
 745 /******************************************************************************
 746  * SetBitmapDimensionEx [GDI32.@]
 747  *
 748  * Assigns dimensions to a bitmap.
 749  * MSDN says that this function will fail if hbitmap is a handle created by
 750  * CreateDIBSection, but that's not true on Windows 2000.
 751  *
 752  * RETURNS
 753  *    Success: TRUE
 754  *    Failure: FALSE
 755  */
 756 BOOL WINAPI SetBitmapDimensionEx(
 757     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 758     INT x,           /* [in]  Bitmap width */
 759     INT y,           /* [in]  Bitmap height */
 760     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 761 {
 762     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 763     if (!bmp) return FALSE;
 764     if (prevSize) *prevSize = bmp->size;
 765     bmp->size.cx = x;
 766     bmp->size.cy = y;
 767     GDI_ReleaseObj( hbitmap );
 768     return TRUE;
 769 }