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