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