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 /***********************************************************************
  50  *           null driver fallback implementations
  51  */
  52
  53 DWORD nulldrv_GetImage( PHYSDEV dev, HBITMAP hbitmap, BITMAPINFO *info,
  54                         struct gdi_image_bits *bits, struct bitblt_coords *src )
  55 {
  56     BITMAPOBJ *bmp;
  57     DWORD ret;
  58
  59     if (!hbitmap) return ERROR_NOT_SUPPORTED;
  60     if (!(bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP ))) return ERROR_INVALID_HANDLE;
  61
  62     if (bmp->bitmap.bmBits || !bits)
  63     {
  64         ret = dib_driver.pGetImage( 0, hbitmap, info, bits, src );
  65     }
  66     else if (!(ret = dib_driver.pGetImage( 0, hbitmap, info, NULL, src )))
  67     {
  68         info->bmiHeader.biHeight = -(src->visrect.bottom - src->visrect.top);
  69         info->bmiHeader.biSizeImage = get_dib_image_size( info );
  70
  71         /* make the source rectangle relative to the returned bits */
  72         src->y -= src->visrect.top;
  73         offset_rect( &src->visrect, 0, -src->visrect.top );
  74
  75         /* return all-zero bits */
  76         bits->ptr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, info->bmiHeader.biSizeImage );
  77         bits->is_copy = TRUE;
  78         bits->free = free_heap_bits;
  79     }
  80     GDI_ReleaseObj( hbitmap );
  81     return ret;
  82 }
  83
  84 DWORD nulldrv_PutImage( PHYSDEV dev, HBITMAP hbitmap, HRGN clip, BITMAPINFO *info,
  85                         const struct gdi_image_bits *bits, struct bitblt_coords *src,
  86                         struct bitblt_coords *dst, DWORD rop )
  87 {
  88     BITMAPOBJ *bmp;
  89
  90     if (!hbitmap) return ERROR_SUCCESS;
  91
  92     if (bits)
  93     {
  94         if (!(bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP ))) return ERROR_INVALID_HANDLE;
  95         if (!bmp->bitmap.bmBits)
  96         {
  97             int width_bytes = get_dib_stride( bmp->bitmap.bmWidth, bmp->bitmap.bmBitsPixel );
  98             if (!(bmp->bitmap.bmBits = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
  99                                                   bmp->bitmap.bmHeight * width_bytes )))
 100             {
 101                 GDI_ReleaseObj( hbitmap );
 102                 return ERROR_OUTOFMEMORY;
 103             }
 104         }
 105         GDI_ReleaseObj( hbitmap );
 106     }
 107     return dib_driver.pPutImage( NULL, hbitmap, clip, info, bits, src, dst, rop );
 108 }
 109
 110
 111 /******************************************************************************
 112  * CreateBitmap [GDI32.@]
 113  *
 114  * Creates a bitmap with the specified info.
 115  *
 116  * PARAMS
 117  *    width  [I] bitmap width
 118  *    height [I] bitmap height
 119  *    planes [I] Number of color planes
 120  *    bpp    [I] Number of bits to identify a color
 121  *    bits   [I] Pointer to array containing color data
 122  *
 123  * RETURNS
 124  *    Success: Handle to bitmap
 125  *    Failure: 0
 126  */
 127 HBITMAP WINAPI CreateBitmap( INT width, INT height, UINT planes,
 128                              UINT bpp, LPCVOID bits )
 129 {
 130     BITMAP bm;
 131
 132     bm.bmType = 0;
 133     bm.bmWidth = width;
 134     bm.bmHeight = height;
 135     bm.bmWidthBytes = get_bitmap_stride( width, bpp );
 136     bm.bmPlanes = planes;
 137     bm.bmBitsPixel = bpp;
 138     bm.bmBits = (LPVOID)bits;
 139
 140     return CreateBitmapIndirect( &bm );
 141 }
 142
 143 /******************************************************************************
 144  * CreateCompatibleBitmap [GDI32.@]
 145  *
 146  * Creates a bitmap compatible with the DC.
 147  *
 148  * PARAMS
 149  *    hdc    [I] Handle to device context
 150  *    width  [I] Width of bitmap
 151  *    height [I] Height of bitmap
 152  *
 153  * RETURNS
 154  *    Success: Handle to bitmap
 155  *    Failure: 0
 156  */
 157 HBITMAP WINAPI CreateCompatibleBitmap( HDC hdc, INT width, INT height)
 158 {
 159     HBITMAP hbmpRet = 0;
 160
 161     TRACE("(%p,%d,%d) =\n", hdc, width, height);
 162
 163     if (GetObjectType( hdc ) != OBJ_MEMDC)
 164     {
 165         hbmpRet = CreateBitmap(width, height,
 166                                GetDeviceCaps(hdc, PLANES),
 167                                GetDeviceCaps(hdc, BITSPIXEL),
 168                                NULL);
 169     }
 170     else  /* Memory DC */
 171     {
 172         DIBSECTION dib;
 173         HBITMAP bitmap = GetCurrentObject( hdc, OBJ_BITMAP );
 174         INT size = GetObjectW( bitmap, sizeof(dib), &dib );
 175
 176         if (!size) return 0;
 177
 178         if (size == sizeof(BITMAP))
 179         {
 180             /* A device-dependent bitmap is selected in the DC */
 181             hbmpRet = CreateBitmap(width, height,
 182                                    dib.dsBm.bmPlanes,
 183                                    dib.dsBm.bmBitsPixel,
 184                                    NULL);
 185         }
 186         else
 187         {
 188             /* A DIB section is selected in the DC */
 189             BITMAPINFO *bi;
 190             void *bits;
 191
 192             /* Allocate memory for a BITMAPINFOHEADER structure and a
 193                color table. The maximum number of colors in a color table
 194                is 256 which corresponds to a bitmap with depth 8.
 195                Bitmaps with higher depths don't have color tables. */
 196             bi = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
 197
 198             if (bi)
 199             {
 200                 bi->bmiHeader.biSize          = sizeof(bi->bmiHeader);
 201                 bi->bmiHeader.biWidth         = width;
 202                 bi->bmiHeader.biHeight        = height;
 203                 bi->bmiHeader.biPlanes        = dib.dsBmih.biPlanes;
 204                 bi->bmiHeader.biBitCount      = dib.dsBmih.biBitCount;
 205                 bi->bmiHeader.biCompression   = dib.dsBmih.biCompression;
 206                 bi->bmiHeader.biSizeImage     = 0;
 207                 bi->bmiHeader.biXPelsPerMeter = dib.dsBmih.biXPelsPerMeter;
 208                 bi->bmiHeader.biYPelsPerMeter = dib.dsBmih.biYPelsPerMeter;
 209                 bi->bmiHeader.biClrUsed       = dib.dsBmih.biClrUsed;
 210                 bi->bmiHeader.biClrImportant  = dib.dsBmih.biClrImportant;
 211
 212                 if (bi->bmiHeader.biCompression == BI_BITFIELDS)
 213                 {
 214                     /* Copy the color masks */
 215                     CopyMemory(bi->bmiColors, dib.dsBitfields, 3 * sizeof(DWORD));
 216                 }
 217                 else if (bi->bmiHeader.biBitCount <= 8)
 218                 {
 219                     /* Copy the color table */
 220                     GetDIBColorTable(hdc, 0, 256, bi->bmiColors);
 221                 }
 222
 223                 hbmpRet = CreateDIBSection(hdc, bi, DIB_RGB_COLORS, &bits, NULL, 0);
 224                 HeapFree(GetProcessHeap(), 0, bi);
 225             }
 226         }
 227     }
 228
 229     TRACE("\t\t%p\n", hbmpRet);
 230     return hbmpRet;
 231 }
 232
 233
 234 /******************************************************************************
 235  * CreateBitmapIndirect [GDI32.@]
 236  *
 237  * Creates a bitmap with the specified info.
 238  *
 239  * PARAMS
 240  *  bmp [I] Pointer to the bitmap info describing the bitmap
 241  *
 242  * RETURNS
 243  *    Success: Handle to bitmap
 244  *    Failure: NULL. Use GetLastError() to determine the cause.
 245  *
 246  * NOTES
 247  *  If a width or height of 0 are given, a 1x1 monochrome bitmap is returned.
 248  */
 249 HBITMAP WINAPI CreateBitmapIndirect( const BITMAP *bmp )
 250 {
 251     BITMAP bm;
 252     BITMAPOBJ *bmpobj;
 253     HBITMAP hbitmap;
 254
 255     if (!bmp || bmp->bmType)
 256     {
 257         SetLastError( ERROR_INVALID_PARAMETER );
 258         return NULL;
 259     }
 260
 261     if (bmp->bmWidth > 0x7ffffff || bmp->bmHeight > 0x7ffffff)
 262     {
 263         SetLastError( ERROR_INVALID_PARAMETER );
 264         return 0;
 265     }
 266
 267     bm = *bmp;
 268
 269     if (!bm.bmWidth || !bm.bmHeight)
 270     {
 271         return GetStockObject( DEFAULT_BITMAP );
 272     }
 273     else
 274     {
 275         if (bm.bmHeight < 0)
 276             bm.bmHeight = -bm.bmHeight;
 277         if (bm.bmWidth < 0)
 278             bm.bmWidth = -bm.bmWidth;
 279     }
 280
 281     if (bm.bmPlanes != 1)
 282     {
 283         FIXME("planes = %d\n", bm.bmPlanes);
 284         SetLastError( ERROR_INVALID_PARAMETER );
 285         return NULL;
 286     }
 287
 288     /* Windows only uses 1, 4, 8, 16, 24 and 32 bpp */
 289     if(bm.bmBitsPixel == 1)         bm.bmBitsPixel = 1;
 290     else if(bm.bmBitsPixel <= 4)    bm.bmBitsPixel = 4;
 291     else if(bm.bmBitsPixel <= 8)    bm.bmBitsPixel = 8;
 292     else if(bm.bmBitsPixel <= 16)   bm.bmBitsPixel = 16;
 293     else if(bm.bmBitsPixel <= 24)   bm.bmBitsPixel = 24;
 294     else if(bm.bmBitsPixel <= 32)   bm.bmBitsPixel = 32;
 295     else {
 296         WARN("Invalid bmBitsPixel %d, returning ERROR_INVALID_PARAMETER\n", bm.bmBitsPixel);
 297         SetLastError(ERROR_INVALID_PARAMETER);
 298         return NULL;
 299     }
 300
 301     /* Windows ignores the provided bm.bmWidthBytes */
 302     bm.bmWidthBytes = get_bitmap_stride( bm.bmWidth, bm.bmBitsPixel );
 303     /* XP doesn't allow to create bitmaps larger than 128 Mb */
 304     if (bm.bmHeight > 128 * 1024 * 1024 / bm.bmWidthBytes)
 305     {
 306         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 307         return 0;
 308     }
 309
 310     /* Create the BITMAPOBJ */
 311     if (!(bmpobj = HeapAlloc( GetProcessHeap(), 0, sizeof(*bmpobj) )))
 312     {
 313         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 314         return 0;
 315     }
 316
 317     bmpobj->size.cx = 0;
 318     bmpobj->size.cy = 0;
 319     bmpobj->bitmap = bm;
 320     bmpobj->bitmap.bmBits = NULL;
 321     bmpobj->funcs = &null_driver;
 322     bmpobj->dib = NULL;
 323     bmpobj->color_table = NULL;
 324     bmpobj->nb_colors = 0;
 325
 326     if (!(hbitmap = alloc_gdi_handle( &bmpobj->header, OBJ_BITMAP, &bitmap_funcs )))
 327     {
 328         HeapFree( GetProcessHeap(), 0, bmpobj );
 329         return 0;
 330     }
 331
 332     if (bm.bmBits)
 333         SetBitmapBits( hbitmap, bm.bmHeight * bm.bmWidthBytes, bm.bmBits );
 334
 335     TRACE("%dx%d, bpp %d planes %d: returning %p\n", bm.bmWidth, bm.bmHeight,
 336           bm.bmBitsPixel, bm.bmPlanes, hbitmap);
 337
 338     return hbitmap;
 339 }
 340
 341
 342 /* convenience wrapper for GetImage to retrieve the full contents of a bitmap */
 343 BOOL get_bitmap_image( HBITMAP hbitmap, BITMAPINFO *info, struct gdi_image_bits *bits )
 344 {
 345     struct bitblt_coords src;
 346     BOOL ret = FALSE;
 347     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 348
 349     if (bmp)
 350     {
 351         src.visrect.left   = src.x = 0;
 352         src.visrect.top    = src.y = 0;
 353         src.visrect.right  = src.width = bmp->bitmap.bmWidth;
 354         src.visrect.bottom = src.height = bmp->bitmap.bmHeight;
 355         ret = !bmp->funcs->pGetImage( NULL, hbitmap, info, bits, &src );
 356         GDI_ReleaseObj( hbitmap );
 357     }
 358     return ret;
 359 }
 360
 361
 362 /***********************************************************************
 363  * GetBitmapBits [GDI32.@]
 364  *
 365  * Copies bitmap bits of bitmap to buffer.
 366  *
 367  * RETURNS
 368  *    Success: Number of bytes copied
 369  *    Failure: 0
 370  */
 371 LONG WINAPI GetBitmapBits(
 372     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 373     LONG count,        /* [in]  Number of bytes to copy */
 374     LPVOID bits)       /* [out] Pointer to buffer to receive bits */
 375 {
 376     char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
 377     BITMAPINFO *info = (BITMAPINFO *)buffer;
 378     struct gdi_image_bits src_bits;
 379     struct bitblt_coords src;
 380     int dst_stride, max, ret;
 381     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 382     const struct gdi_dc_funcs *funcs;
 383
 384     if (!bmp) return 0;
 385     funcs = get_bitmap_funcs( bmp );
 386
 387     if (bmp->dib) dst_stride = get_bitmap_stride( bmp->dib->dsBmih.biWidth, bmp->dib->dsBmih.biBitCount );
 388     else dst_stride = get_bitmap_stride( bmp->bitmap.bmWidth, bmp->bitmap.bmBitsPixel );
 389
 390     ret = max = dst_stride * bmp->bitmap.bmHeight;
 391     if (!bits) goto done;
 392     if (count > max) count = max;
 393     ret = count;
 394
 395     src.visrect.left = 0;
 396     src.visrect.right = bmp->bitmap.bmWidth;
 397     src.visrect.top = 0;
 398     src.visrect.bottom = (count + dst_stride - 1) / dst_stride;
 399     src.x = src.y = 0;
 400     src.width = src.visrect.right - src.visrect.left;
 401     src.height = src.visrect.bottom - src.visrect.top;
 402
 403     if (!funcs->pGetImage( NULL, hbitmap, info, &src_bits, &src ))
 404     {
 405         const char *src_ptr = src_bits.ptr;
 406         int src_stride = get_dib_stride( info->bmiHeader.biWidth, info->bmiHeader.biBitCount );
 407
 408         /* GetBitmapBits returns 16-bit aligned data */
 409
 410         if (info->bmiHeader.biHeight > 0)
 411         {
 412             src_ptr += (info->bmiHeader.biHeight - 1) * src_stride;
 413             src_stride = -src_stride;
 414         }
 415         src_ptr += src.visrect.top * src_stride;
 416
 417         if (src_stride == dst_stride) memcpy( bits, src_ptr, count );
 418         else while (count > 0)
 419         {
 420             memcpy( bits, src_ptr, min( count, dst_stride ) );
 421             src_ptr += src_stride;
 422             bits = (char *)bits + dst_stride;
 423             count -= dst_stride;
 424         }
 425         if (src_bits.free) src_bits.free( &src_bits );
 426     }
 427     else ret = 0;
 428
 429 done:
 430     GDI_ReleaseObj( hbitmap );
 431     return ret;
 432 }
 433
 434
 435 /******************************************************************************
 436  * SetBitmapBits [GDI32.@]
 437  *
 438  * Sets bits of color data for a bitmap.
 439  *
 440  * RETURNS
 441  *    Success: Number of bytes used in setting the bitmap bits
 442  *    Failure: 0
 443  */
 444 LONG WINAPI SetBitmapBits(
 445     HBITMAP hbitmap, /* [in] Handle to bitmap */
 446     LONG count,        /* [in] Number of bytes in bitmap array */
 447     LPCVOID bits)      /* [in] Address of array with bitmap bits */
 448 {
 449     char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
 450     BITMAPINFO *info = (BITMAPINFO *)buffer;
 451     BITMAPOBJ *bmp;
 452     DWORD err;
 453     int i, src_stride, dst_stride;
 454     struct bitblt_coords src, dst;
 455     struct gdi_image_bits src_bits;
 456     HRGN clip = NULL;
 457     const struct gdi_dc_funcs *funcs;
 458
 459     if (!bits) return 0;
 460
 461     bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 462     if (!bmp) return 0;
 463
 464     funcs = get_bitmap_funcs( bmp );
 465
 466     if (count < 0) {
 467         WARN("(%d): Negative number of bytes passed???\n", count );
 468         count = -count;
 469     }
 470
 471     if (bmp->dib) src_stride = get_bitmap_stride( bmp->dib->dsBmih.biWidth, bmp->dib->dsBmih.biBitCount );
 472     else src_stride = get_bitmap_stride( bmp->bitmap.bmWidth, bmp->bitmap.bmBitsPixel );
 473     count = min( count, src_stride * bmp->bitmap.bmHeight );
 474
 475     dst_stride = get_dib_stride( bmp->bitmap.bmWidth, bmp->bitmap.bmBitsPixel );
 476
 477     src.visrect.left   = src.x = 0;
 478     src.visrect.top    = src.y = 0;
 479     src.visrect.right  = src.width = bmp->bitmap.bmWidth;
 480     src.visrect.bottom = src.height = (count + src_stride - 1 ) / src_stride;
 481     dst = src;
 482
 483     if (count % src_stride)
 484     {
 485         HRGN last_row;
 486         int extra_pixels = ((count % src_stride) << 3) / bmp->bitmap.bmBitsPixel;
 487
 488         if ((count % src_stride << 3) % bmp->bitmap.bmBitsPixel)
 489             FIXME( "Unhandled partial pixel\n" );
 490         clip = CreateRectRgn( src.visrect.left, src.visrect.top,
 491                               src.visrect.right, src.visrect.bottom - 1 );
 492         last_row = CreateRectRgn( src.visrect.left, src.visrect.bottom - 1,
 493                                   src.visrect.left + extra_pixels, src.visrect.bottom );
 494         CombineRgn( clip, clip, last_row, RGN_OR );
 495         DeleteObject( last_row );
 496     }
 497
 498     TRACE("(%p, %d, %p) %dx%d %d bpp fetched height: %d\n",
 499           hbitmap, count, bits, bmp->bitmap.bmWidth, bmp->bitmap.bmHeight,
 500           bmp->bitmap.bmBitsPixel, src.height );
 501
 502     if (src_stride == dst_stride)
 503     {
 504         src_bits.ptr = (void *)bits;
 505         src_bits.is_copy = FALSE;
 506         src_bits.free = NULL;
 507     }
 508     else
 509     {
 510         if (!(src_bits.ptr = HeapAlloc( GetProcessHeap(), 0, dst.height * dst_stride )))
 511         {
 512             GDI_ReleaseObj( hbitmap );
 513             return 0;
 514         }
 515         src_bits.is_copy = TRUE;
 516         src_bits.free = free_heap_bits;
 517         for (i = 0; i < count / src_stride; i++)
 518             memcpy( (char *)src_bits.ptr + i * dst_stride, (char *)bits + i * src_stride, src_stride );
 519         if (count % src_stride)
 520             memcpy( (char *)src_bits.ptr + i * dst_stride, (char *)bits + i * src_stride, count % src_stride );
 521     }
 522
 523     /* query the color info */
 524     info->bmiHeader.biSize          = sizeof(info->bmiHeader);
 525     info->bmiHeader.biPlanes        = 1;
 526     info->bmiHeader.biBitCount      = bmp->bitmap.bmBitsPixel;
 527     info->bmiHeader.biCompression   = BI_RGB;
 528     info->bmiHeader.biXPelsPerMeter = 0;
 529     info->bmiHeader.biYPelsPerMeter = 0;
 530     info->bmiHeader.biClrUsed       = 0;
 531     info->bmiHeader.biClrImportant  = 0;
 532     info->bmiHeader.biWidth         = 0;
 533     info->bmiHeader.biHeight        = 0;
 534     info->bmiHeader.biSizeImage     = 0;
 535     err = funcs->pPutImage( NULL, hbitmap, 0, info, NULL, NULL, NULL, SRCCOPY );
 536
 537     if (!err || err == ERROR_BAD_FORMAT)
 538     {
 539         info->bmiHeader.biPlanes        = 1;
 540         info->bmiHeader.biBitCount      = bmp->bitmap.bmBitsPixel;
 541         info->bmiHeader.biWidth         = bmp->bitmap.bmWidth;
 542         info->bmiHeader.biHeight        = -dst.height;
 543         info->bmiHeader.biSizeImage     = dst.height * dst_stride;
 544         err = funcs->pPutImage( NULL, hbitmap, clip, info, &src_bits, &src, &dst, SRCCOPY );
 545     }
 546     if (err) count = 0;
 547
 548     if (clip) DeleteObject( clip );
 549     if (src_bits.free) src_bits.free( &src_bits );
 550     GDI_ReleaseObj( hbitmap );
 551     return count;
 552 }
 553
 554 /**********************************************************************
 555  *              BITMAP_CopyBitmap
 556  *
 557  */
 558 HBITMAP BITMAP_CopyBitmap(HBITMAP hbitmap)
 559 {
 560     HBITMAP res;
 561     DIBSECTION dib;
 562     BITMAPOBJ *bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 563
 564     if (!bmp) return 0;
 565     if (bmp->dib)
 566     {
 567         void *bits;
 568         BITMAPINFO *bi;
 569         HDC dc;
 570
 571         dib = *bmp->dib;
 572         GDI_ReleaseObj( hbitmap );
 573         dc = CreateCompatibleDC( NULL );
 574
 575         if (!dc) return 0;
 576         if (!(bi = HeapAlloc(GetProcessHeap(), 0, FIELD_OFFSET( BITMAPINFO, bmiColors[256] ))))
 577         {
 578             DeleteDC( dc );
 579             return 0;
 580         }
 581         bi->bmiHeader = dib.dsBmih;
 582
 583         /* Get the color table or the color masks */
 584         GetDIBits( dc, hbitmap, 0, 0, NULL, bi, DIB_RGB_COLORS );
 585         bi->bmiHeader.biHeight = dib.dsBmih.biHeight;
 586
 587         res = CreateDIBSection( dc, bi, DIB_RGB_COLORS, &bits, NULL, 0 );
 588         if (res) SetDIBits( dc, res, 0, dib.dsBm.bmHeight, dib.dsBm.bmBits, bi, DIB_RGB_COLORS );
 589         HeapFree( GetProcessHeap(), 0, bi );
 590         DeleteDC( dc );
 591         return res;
 592     }
 593     dib.dsBm = bmp->bitmap;
 594     dib.dsBm.bmBits = NULL;
 595     GDI_ReleaseObj( hbitmap );
 596
 597     res = CreateBitmapIndirect( &dib.dsBm );
 598     if(res) {
 599         char *buf = HeapAlloc( GetProcessHeap(), 0, dib.dsBm.bmWidthBytes * dib.dsBm.bmHeight );
 600         GetBitmapBits (hbitmap, dib.dsBm.bmWidthBytes * dib.dsBm.bmHeight, buf);
 601         SetBitmapBits (res, dib.dsBm.bmWidthBytes * dib.dsBm.bmHeight, buf);
 602         HeapFree( GetProcessHeap(), 0, buf );
 603     }
 604     return res;
 605 }
 606
 607
 608 static void set_initial_bitmap_bits( HBITMAP hbitmap, BITMAPOBJ *bmp )
 609 {
 610     char buffer[FIELD_OFFSET( BITMAPINFO, bmiColors[256] )];
 611     BITMAPINFO *info = (BITMAPINFO *)buffer;
 612
 613     if (!bmp->bitmap.bmBits) return;
 614     if (bmp->funcs->pPutImage == nulldrv_PutImage) return;
 615
 616     get_ddb_bitmapinfo( bmp, info );
 617     SetDIBits( 0, hbitmap, 0, bmp->bitmap.bmHeight, bmp->bitmap.bmBits, info, DIB_RGB_COLORS );
 618     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 619     bmp->bitmap.bmBits = NULL;
 620 }
 621
 622 /***********************************************************************
 623  *           BITMAP_SetOwnerDC
 624  *
 625  * Set the type of DC that owns the bitmap. This is used when the
 626  * bitmap is selected into a device to initialize the bitmap function
 627  * table.
 628  */
 629 BOOL BITMAP_SetOwnerDC( HBITMAP hbitmap, PHYSDEV physdev )
 630 {
 631     BITMAPOBJ *bitmap;
 632     BOOL ret = TRUE;
 633
 634     /* never set the owner of the stock bitmap since it can be selected in multiple DCs */
 635     if (hbitmap == GetStockObject(DEFAULT_BITMAP)) return TRUE;
 636
 637     if (!(bitmap = GDI_GetObjPtr( hbitmap, OBJ_BITMAP ))) return FALSE;
 638
 639     if (!bitmap->dib && bitmap->funcs != physdev->funcs)
 640     {
 641         /* we can only change from the null driver to some other driver */
 642         if (bitmap->funcs == &null_driver)
 643         {
 644             if (physdev->funcs->pCreateBitmap)
 645             {
 646                 ret = physdev->funcs->pCreateBitmap( physdev, hbitmap );
 647                 if (ret)
 648                 {
 649                     bitmap->funcs = physdev->funcs;
 650                     set_initial_bitmap_bits( hbitmap, bitmap );
 651                 }
 652             }
 653             else
 654             {
 655                 WARN( "Trying to select bitmap %p in DC that doesn't support it\n", hbitmap );
 656                 ret = FALSE;
 657             }
 658         }
 659         else
 660         {
 661             FIXME( "Trying to select bitmap %p in different DC type\n", hbitmap );
 662             ret = FALSE;
 663         }
 664     }
 665     GDI_ReleaseObj( hbitmap );
 666     return ret;
 667 }
 668
 669
 670 /***********************************************************************
 671  *           BITMAP_SelectObject
 672  */
 673 static HGDIOBJ BITMAP_SelectObject( HGDIOBJ handle, HDC hdc )
 674 {
 675     HGDIOBJ ret;
 676     BITMAPOBJ *bitmap;
 677     DC *dc;
 678     PHYSDEV physdev = NULL, old_physdev = NULL;
 679
 680     if (!(dc = get_dc_ptr( hdc ))) return 0;
 681
 682     if (GetObjectType( hdc ) != OBJ_MEMDC)
 683     {
 684         ret = 0;
 685         goto done;
 686     }
 687     ret = dc->hBitmap;
 688     if (handle == dc->hBitmap) goto done;  /* nothing to do */
 689
 690     if (!(bitmap = GDI_GetObjPtr( handle, OBJ_BITMAP )))
 691     {
 692         ret = 0;
 693         goto done;
 694     }
 695
 696     if (bitmap->header.selcount && (handle != GetStockObject(DEFAULT_BITMAP)))
 697     {
 698         WARN( "Bitmap already selected in another DC\n" );
 699         GDI_ReleaseObj( handle );
 700         ret = 0;
 701         goto done;
 702     }
 703
 704     old_physdev = GET_DC_PHYSDEV( dc, pSelectBitmap );
 705     if(old_physdev == dc->dibdrv)
 706         old_physdev = pop_dc_driver( &dc->physDev );
 707
 708     if(bitmap->dib)
 709     {
 710         physdev = dc->dibdrv;
 711         if (physdev) push_dc_driver( &dc->physDev, physdev, physdev->funcs );
 712         else
 713         {
 714             if (!dib_driver.pCreateDC( &dc->physDev, NULL, NULL, NULL, NULL )) goto done;
 715             dc->dibdrv = physdev = dc->physDev;
 716         }
 717     }
 718     else
 719         physdev = GET_DC_PHYSDEV( dc, pSelectBitmap );
 720
 721     if (!BITMAP_SetOwnerDC( handle, physdev ))
 722     {
 723         GDI_ReleaseObj( handle );
 724         ret = 0;
 725         goto done;
 726     }
 727     if (!physdev->funcs->pSelectBitmap( physdev, handle ))
 728     {
 729         GDI_ReleaseObj( handle );
 730         ret = 0;
 731     }
 732     else
 733     {
 734         dc->hBitmap = handle;
 735         GDI_inc_ref_count( handle );
 736         dc->dirty = 0;
 737         dc->vis_rect.left   = 0;
 738         dc->vis_rect.top    = 0;
 739         dc->vis_rect.right  = bitmap->bitmap.bmWidth;
 740         dc->vis_rect.bottom = bitmap->bitmap.bmHeight;
 741         SetRectRgn( dc->hVisRgn, 0, 0, bitmap->bitmap.bmWidth, bitmap->bitmap.bmHeight);
 742         GDI_ReleaseObj( handle );
 743         DC_InitDC( dc );
 744         GDI_dec_ref_count( ret );
 745     }
 746
 747  done:
 748     if(!ret)
 749     {
 750         if (physdev && physdev == dc->dibdrv)
 751             pop_dc_driver( &dc->physDev );
 752         if (old_physdev && old_physdev == dc->dibdrv)
 753             push_dc_driver( &dc->physDev, old_physdev, old_physdev->funcs );
 754     }
 755     release_dc_ptr( dc );
 756     return ret;
 757 }
 758
 759
 760 /***********************************************************************
 761  *           BITMAP_DeleteObject
 762  */
 763 static BOOL BITMAP_DeleteObject( HGDIOBJ handle )
 764 {
 765     const DC_FUNCTIONS *funcs;
 766     BITMAPOBJ *bmp = GDI_GetObjPtr( handle, OBJ_BITMAP );
 767
 768     if (!bmp) return FALSE;
 769     funcs = bmp->funcs;
 770     GDI_ReleaseObj( handle );
 771
 772     funcs->pDeleteBitmap( handle );
 773
 774     if (!(bmp = free_gdi_handle( handle ))) return FALSE;
 775
 776     HeapFree( GetProcessHeap(), 0, bmp->bitmap.bmBits );
 777
 778     if (bmp->dib)
 779     {
 780         DIBSECTION *dib = bmp->dib;
 781
 782         if (dib->dsBm.bmBits)
 783         {
 784             if (dib->dshSection)
 785             {
 786                 SYSTEM_INFO SystemInfo;
 787                 GetSystemInfo( &SystemInfo );
 788                 UnmapViewOfFile( (char *)dib->dsBm.bmBits -
 789                                  (dib->dsOffset % SystemInfo.dwAllocationGranularity) );
 790             }
 791             else if (!dib->dsOffset)
 792                 VirtualFree(dib->dsBm.bmBits, 0L, MEM_RELEASE );
 793         }
 794         HeapFree(GetProcessHeap(), 0, dib);
 795         HeapFree(GetProcessHeap(), 0, bmp->color_table);
 796     }
 797     return HeapFree( GetProcessHeap(), 0, bmp );
 798 }
 799
 800
 801 /***********************************************************************
 802  *           BITMAP_GetObject
 803  */
 804 static INT BITMAP_GetObject( HGDIOBJ handle, INT count, LPVOID buffer )
 805 {
 806     INT ret;
 807     BITMAPOBJ *bmp = GDI_GetObjPtr( handle, OBJ_BITMAP );
 808
 809     if (!bmp) return 0;
 810
 811     if (!buffer) ret = sizeof(BITMAP);
 812     else if (count < sizeof(BITMAP)) ret = 0;
 813     else if (bmp->dib)
 814     {
 815         if (count >= sizeof(DIBSECTION))
 816         {
 817             DIBSECTION *dib = buffer;
 818             *dib = *bmp->dib;
 819             dib->dsBmih.biHeight = abs( dib->dsBmih.biHeight );
 820             ret = sizeof(DIBSECTION);
 821         }
 822         else /* if (count >= sizeof(BITMAP)) */
 823         {
 824             DIBSECTION *dib = bmp->dib;
 825             memcpy( buffer, &dib->dsBm, sizeof(BITMAP) );
 826             ret = sizeof(BITMAP);
 827         }
 828     }
 829     else
 830     {
 831         memcpy( buffer, &bmp->bitmap, sizeof(BITMAP) );
 832         ((BITMAP *) buffer)->bmBits = NULL;
 833         ret = sizeof(BITMAP);
 834     }
 835     GDI_ReleaseObj( handle );
 836     return ret;
 837 }
 838
 839
 840 /******************************************************************************
 841  * CreateDiscardableBitmap [GDI32.@]
 842  *
 843  * Creates a discardable bitmap.
 844  *
 845  * RETURNS
 846  *    Success: Handle to bitmap
 847  *    Failure: NULL
 848  */
 849 HBITMAP WINAPI CreateDiscardableBitmap(
 850     HDC hdc,    /* [in] Handle to device context */
 851     INT width,  /* [in] Bitmap width */
 852     INT height) /* [in] Bitmap height */
 853 {
 854     return CreateCompatibleBitmap( hdc, width, height );
 855 }
 856
 857
 858 /******************************************************************************
 859  * GetBitmapDimensionEx [GDI32.@]
 860  *
 861  * Retrieves dimensions of a bitmap.
 862  *
 863  * RETURNS
 864  *    Success: TRUE
 865  *    Failure: FALSE
 866  */
 867 BOOL WINAPI GetBitmapDimensionEx(
 868     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 869     LPSIZE size)     /* [out] Address of struct receiving dimensions */
 870 {
 871     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 872     if (!bmp) return FALSE;
 873     *size = bmp->size;
 874     GDI_ReleaseObj( hbitmap );
 875     return TRUE;
 876 }
 877
 878
 879 /******************************************************************************
 880  * SetBitmapDimensionEx [GDI32.@]
 881  *
 882  * Assigns dimensions to a bitmap.
 883  * MSDN says that this function will fail if hbitmap is a handle created by
 884  * CreateDIBSection, but that's not true on Windows 2000.
 885  *
 886  * RETURNS
 887  *    Success: TRUE
 888  *    Failure: FALSE
 889  */
 890 BOOL WINAPI SetBitmapDimensionEx(
 891     HBITMAP hbitmap, /* [in]  Handle to bitmap */
 892     INT x,           /* [in]  Bitmap width */
 893     INT y,           /* [in]  Bitmap height */
 894     LPSIZE prevSize) /* [out] Address of structure for orig dims */
 895 {
 896     BITMAPOBJ * bmp = GDI_GetObjPtr( hbitmap, OBJ_BITMAP );
 897     if (!bmp) return FALSE;
 898     if (prevSize) *prevSize = bmp->size;
 899     bmp->size.cx = x;
 900     bmp->size.cy = y;
 901     GDI_ReleaseObj( hbitmap );
 902     return TRUE;
 903 }