git.oblomov.eu Git - wine/blob - dlls/gdi32/dibdrv/dc.c

   1 /*
   2  * DIB driver initialization and DC functions.
   3  *
   4  * Copyright 2011 Huw Davies
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <assert.h>
  22
  23 #include "gdi_private.h"
  24 #include "dibdrv.h"
  25
  26 #include "wine/exception.h"
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(dib);
  30
  31 static const DWORD bit_fields_888[3] = {0xff0000, 0x00ff00, 0x0000ff};
  32 static const DWORD bit_fields_555[3] = {0x7c00, 0x03e0, 0x001f};
  33
  34 static void calc_shift_and_len(DWORD mask, int *shift, int *len)
  35 {
  36     int s, l;
  37
  38     if(!mask)
  39     {
  40         *shift = *len = 0;
  41         return;
  42     }
  43
  44     s = 0;
  45     while ((mask & 1) == 0)
  46     {
  47         mask >>= 1;
  48         s++;
  49     }
  50     l = 0;
  51     while ((mask & 1) == 1)
  52     {
  53         mask >>= 1;
  54         l++;
  55     }
  56     *shift = s;
  57     *len = l;
  58 }
  59
  60 static void init_bit_fields(dib_info *dib, const DWORD *bit_fields)
  61 {
  62     dib->red_mask    = bit_fields[0];
  63     dib->green_mask  = bit_fields[1];
  64     dib->blue_mask   = bit_fields[2];
  65     calc_shift_and_len(dib->red_mask,   &dib->red_shift,   &dib->red_len);
  66     calc_shift_and_len(dib->green_mask, &dib->green_shift, &dib->green_len);
  67     calc_shift_and_len(dib->blue_mask,  &dib->blue_shift,  &dib->blue_len);
  68 }
  69
  70 static void init_dib_info(dib_info *dib, const BITMAPINFOHEADER *bi, const DWORD *bit_fields,
  71                           const RGBQUAD *color_table, void *bits, enum dib_info_flags flags)
  72 {
  73     dib->bit_count    = bi->biBitCount;
  74     dib->width        = bi->biWidth;
  75     dib->height       = bi->biHeight;
  76     dib->rect.left    = 0;
  77     dib->rect.top     = 0;
  78     dib->rect.right   = bi->biWidth;
  79     dib->rect.bottom  = abs( bi->biHeight );
  80     dib->compression  = bi->biCompression;
  81     dib->stride       = get_dib_stride( dib->width, dib->bit_count );
  82     dib->bits.ptr     = bits;
  83     dib->bits.is_copy = FALSE;
  84     dib->bits.free    = NULL;
  85     dib->bits.param   = NULL;
  86
  87     if(dib->height < 0) /* top-down */
  88     {
  89         dib->height = -dib->height;
  90     }
  91     else /* bottom-up */
  92     {
  93         /* bits always points to the top-left corner and the stride is -ve */
  94         dib->bits.ptr = (BYTE*)dib->bits.ptr + (dib->height - 1) * dib->stride;
  95         dib->stride  = -dib->stride;
  96     }
  97
  98     dib->funcs = &funcs_null;
  99
 100     switch(dib->bit_count)
 101     {
 102     case 32:
 103         if(bi->biCompression == BI_RGB)
 104             bit_fields = bit_fields_888;
 105
 106         init_bit_fields(dib, bit_fields);
 107
 108         if(dib->red_mask == 0xff0000 && dib->green_mask == 0x00ff00 && dib->blue_mask == 0x0000ff)
 109             dib->funcs = &funcs_8888;
 110         else
 111             dib->funcs = &funcs_32;
 112         break;
 113
 114     case 24:
 115         dib->funcs = &funcs_24;
 116         break;
 117
 118     case 16:
 119         if(bi->biCompression == BI_RGB)
 120             bit_fields = bit_fields_555;
 121
 122         init_bit_fields(dib, bit_fields);
 123
 124         if(dib->red_mask == 0x7c00 && dib->green_mask == 0x03e0 && dib->blue_mask == 0x001f)
 125             dib->funcs = &funcs_555;
 126         else
 127             dib->funcs = &funcs_16;
 128         break;
 129
 130     case 8:
 131         dib->funcs = &funcs_8;
 132         break;
 133
 134     case 4:
 135         dib->funcs = &funcs_4;
 136         break;
 137
 138     case 1:
 139         dib->funcs = &funcs_1;
 140         break;
 141     }
 142
 143     if (color_table && bi->biClrUsed)
 144     {
 145         dib->color_table = color_table;
 146         dib->color_table_size = bi->biClrUsed;
 147     }
 148     else if (flags & default_color_table)
 149     {
 150         dib->color_table = get_default_color_table( dib->bit_count );
 151         dib->color_table_size = dib->color_table ? (1 << dib->bit_count) : 0;
 152     }
 153     else
 154     {
 155         dib->color_table = NULL;
 156         dib->color_table_size = 0;
 157     }
 158 }
 159
 160 void init_dib_info_from_bitmapinfo(dib_info *dib, const BITMAPINFO *info, void *bits, enum dib_info_flags flags)
 161 {
 162     init_dib_info( dib, &info->bmiHeader, (const DWORD *)info->bmiColors, info->bmiColors, bits, flags );
 163 }
 164
 165 BOOL init_dib_info_from_bitmapobj(dib_info *dib, BITMAPOBJ *bmp, enum dib_info_flags flags)
 166 {
 167     if (!is_bitmapobj_dib( bmp ))
 168     {
 169         BITMAPINFO info;
 170
 171         get_ddb_bitmapinfo( bmp, &info );
 172         if (!bmp->dib.dsBm.bmBits)
 173         {
 174             int width_bytes = get_dib_stride( bmp->dib.dsBm.bmWidth, bmp->dib.dsBm.bmBitsPixel );
 175             bmp->dib.dsBm.bmBits = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 176                                               bmp->dib.dsBm.bmHeight * width_bytes );
 177             if (!bmp->dib.dsBm.bmBits) return FALSE;
 178         }
 179         init_dib_info_from_bitmapinfo( dib, &info, bmp->dib.dsBm.bmBits, flags );
 180     }
 181     else init_dib_info( dib, &bmp->dib.dsBmih, bmp->dib.dsBitfields,
 182                         bmp->color_table, bmp->dib.dsBm.bmBits, flags );
 183     return TRUE;
 184 }
 185
 186 static void clear_dib_info(dib_info *dib)
 187 {
 188     dib->color_table = NULL;
 189     dib->bits.ptr    = NULL;
 190     dib->bits.free   = NULL;
 191     dib->bits.param  = NULL;
 192 }
 193
 194 /**********************************************************************
 195  *      free_dib_info
 196  *
 197  * Free the resources associated with a dib and optionally the bits
 198  */
 199 void free_dib_info(dib_info *dib)
 200 {
 201     if (dib->bits.free) dib->bits.free( &dib->bits );
 202     clear_dib_info( dib );
 203 }
 204
 205 void copy_dib_color_info(dib_info *dst, const dib_info *src)
 206 {
 207     dst->bit_count        = src->bit_count;
 208     dst->red_mask         = src->red_mask;
 209     dst->green_mask       = src->green_mask;
 210     dst->blue_mask        = src->blue_mask;
 211     dst->red_len          = src->red_len;
 212     dst->green_len        = src->green_len;
 213     dst->blue_len         = src->blue_len;
 214     dst->red_shift        = src->red_shift;
 215     dst->green_shift      = src->green_shift;
 216     dst->blue_shift       = src->blue_shift;
 217     dst->funcs            = src->funcs;
 218     dst->color_table_size = src->color_table_size;
 219     dst->color_table      = src->color_table;
 220 }
 221
 222 DWORD convert_bitmapinfo( const BITMAPINFO *src_info, void *src_bits, struct bitblt_coords *src,
 223                           const BITMAPINFO *dst_info, void *dst_bits, BOOL add_alpha )
 224 {
 225     dib_info src_dib, dst_dib;
 226     DWORD ret;
 227
 228     init_dib_info_from_bitmapinfo( &src_dib, src_info, src_bits, default_color_table );
 229     init_dib_info_from_bitmapinfo( &dst_dib, dst_info, dst_bits, default_color_table );
 230
 231     __TRY
 232     {
 233         dst_dib.funcs->convert_to( &dst_dib, &src_dib, &src->visrect );
 234         ret = TRUE;
 235     }
 236     __EXCEPT_PAGE_FAULT
 237     {
 238         WARN( "invalid bits pointer %p\n", src_bits );
 239         ret = FALSE;
 240     }
 241     __ENDTRY
 242
 243     /* We shared the color tables, so there's no need to free the dib_infos here */
 244     if(!ret) return ERROR_BAD_FORMAT;
 245
 246     /* update coordinates, the destination rectangle is always stored at 0,0 */
 247     src->x -= src->visrect.left;
 248     src->y -= src->visrect.top;
 249     offset_rect( &src->visrect, -src->visrect.left, -src->visrect.top );
 250
 251     if (add_alpha && dst_dib.funcs == &funcs_8888 && src_dib.funcs != &funcs_8888)
 252     {
 253         DWORD *pixel = dst_dib.bits.ptr;
 254         int x, y;
 255
 256         for (y = src->visrect.top; y < src->visrect.bottom; y++, pixel += dst_dib.stride / 4)
 257             for (x = src->visrect.left; x < src->visrect.right; x++)
 258                 pixel[x] |= 0xff000000;
 259     }
 260
 261     return ERROR_SUCCESS;
 262 }
 263
 264 int get_clipped_rects( const dib_info *dib, const RECT *rc, HRGN clip, struct clipped_rects *clip_rects )
 265 {
 266     const WINEREGION *region;
 267     RECT rect, *out = clip_rects->buffer;
 268     int i;
 269
 270     init_clipped_rects( clip_rects );
 271
 272     rect.left   = 0;
 273     rect.top    = 0;
 274     rect.right  = dib->rect.right - dib->rect.left;
 275     rect.bottom = dib->rect.bottom - dib->rect.top;
 276     if (rc && !intersect_rect( &rect, &rect, rc )) return 0;
 277
 278     if (!clip)
 279     {
 280         *out = rect;
 281         clip_rects->count = 1;
 282         return 1;
 283     }
 284
 285     if (!(region = get_wine_region( clip ))) return 0;
 286
 287     for (i = 0; i < region->numRects; i++)
 288     {
 289         if (region->rects[i].top >= rect.bottom) break;
 290         if (!intersect_rect( out, &rect, &region->rects[i] )) continue;
 291         out++;
 292         if (out == &clip_rects->buffer[sizeof(clip_rects->buffer) / sizeof(RECT)])
 293         {
 294             clip_rects->rects = HeapAlloc( GetProcessHeap(), 0, region->numRects * sizeof(RECT) );
 295             if (!clip_rects->rects) return 0;
 296             memcpy( clip_rects->rects, clip_rects->buffer, (out - clip_rects->buffer) * sizeof(RECT) );
 297             out = clip_rects->rects + (out - clip_rects->buffer);
 298         }
 299     }
 300     release_wine_region( clip );
 301     clip_rects->count = out - clip_rects->rects;
 302     return clip_rects->count;
 303 }
 304
 305 void add_clipped_bounds( dibdrv_physdev *dev, const RECT *rect, HRGN clip )
 306 {
 307     const WINEREGION *region;
 308     RECT rc;
 309
 310     if (!dev->bounds) return;
 311     if (clip)
 312     {
 313         if (!(region = get_wine_region( clip ))) return;
 314         if (!rect) rc = region->extents;
 315         else intersect_rect( &rc, rect, &region->extents );
 316         release_wine_region( clip );
 317     }
 318     else rc = *rect;
 319
 320     if (is_rect_empty( &rc )) return;
 321     offset_rect( &rc, dev->dib.rect.left, dev->dib.rect.top );
 322     add_bounds_rect( dev->bounds, &rc );
 323 }
 324
 325 /**********************************************************************
 326  *           dibdrv_CreateDC
 327  */
 328 static BOOL dibdrv_CreateDC( PHYSDEV *dev, LPCWSTR driver, LPCWSTR device,
 329                              LPCWSTR output, const DEVMODEW *data )
 330 {
 331     dibdrv_physdev *pdev = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*pdev) );
 332
 333     if (!pdev) return FALSE;
 334     clear_dib_info(&pdev->dib);
 335     clear_dib_info(&pdev->brush.dib);
 336     clear_dib_info(&pdev->pen_brush.dib);
 337     push_dc_driver( dev, &pdev->dev, &dib_driver );
 338     return TRUE;
 339 }
 340
 341 /***********************************************************************
 342  *           dibdrv_DeleteDC
 343  */
 344 static BOOL dibdrv_DeleteDC( PHYSDEV dev )
 345 {
 346     dibdrv_physdev *pdev = get_dibdrv_pdev(dev);
 347     TRACE("(%p)\n", dev);
 348     free_pattern_brush( &pdev->brush );
 349     free_pattern_brush( &pdev->pen_brush );
 350     HeapFree( GetProcessHeap(), 0, pdev );
 351     return TRUE;
 352 }
 353
 354 /***********************************************************************
 355  *           dibdrv_CopyBitmap
 356  */
 357 static BOOL dibdrv_CopyBitmap( HBITMAP src, HBITMAP dst )
 358 {
 359     return nulldrv_CopyBitmap( src, dst );
 360 }
 361
 362 /***********************************************************************
 363  *           dibdrv_DeleteBitmap
 364  */
 365 static BOOL dibdrv_DeleteBitmap( HBITMAP bitmap )
 366 {
 367     return TRUE;
 368 }
 369
 370 /***********************************************************************
 371  *           dibdrv_SelectBitmap
 372  */
 373 static HBITMAP dibdrv_SelectBitmap( PHYSDEV dev, HBITMAP bitmap )
 374 {
 375     dibdrv_physdev *pdev = get_dibdrv_pdev(dev);
 376     BITMAPOBJ *bmp = GDI_GetObjPtr( bitmap, OBJ_BITMAP );
 377     dib_info dib;
 378
 379     TRACE("(%p, %p)\n", dev, bitmap);
 380
 381     if (!bmp) return 0;
 382
 383     if(!init_dib_info_from_bitmapobj(&dib, bmp, default_color_table))
 384     {
 385         GDI_ReleaseObj( bitmap );
 386         return 0;
 387     }
 388     pdev->dib = dib;
 389     GDI_ReleaseObj( bitmap );
 390
 391     return bitmap;
 392 }
 393
 394 /***********************************************************************
 395  *           dibdrv_SetDeviceClipping
 396  */
 397 static void dibdrv_SetDeviceClipping( PHYSDEV dev, HRGN rgn )
 398 {
 399     dibdrv_physdev *pdev = get_dibdrv_pdev(dev);
 400     TRACE("(%p, %p)\n", dev, rgn);
 401
 402     pdev->clip = rgn;
 403 }
 404
 405 /***********************************************************************
 406  *           dibdrv_SetBoundsRect
 407  */
 408 static UINT dibdrv_SetBoundsRect( PHYSDEV dev, RECT *rect, UINT flags )
 409 {
 410     dibdrv_physdev *pdev = get_dibdrv_pdev( dev );
 411
 412     if (flags & DCB_DISABLE) pdev->bounds = NULL;
 413     else if (flags & DCB_ENABLE) pdev->bounds = rect;
 414     return DCB_RESET;  /* we don't have device-specific bounds */
 415 }
 416
 417 /***********************************************************************
 418  *           dibdrv_GetDeviceGammaRamp
 419  */
 420 static BOOL dibdrv_GetDeviceGammaRamp( PHYSDEV dev, void *ramp )
 421 {
 422     SetLastError( ERROR_INVALID_PARAMETER );
 423     return FALSE;
 424 }
 425
 426 /***********************************************************************
 427  *           dibdrv_SetDeviceGammaRamp
 428  */
 429 static BOOL dibdrv_SetDeviceGammaRamp( PHYSDEV dev, void *ramp )
 430 {
 431     SetLastError( ERROR_INVALID_PARAMETER );
 432     return FALSE;
 433 }
 434
 435 const struct gdi_dc_funcs dib_driver =
 436 {
 437     NULL,                               /* pAbortDoc */
 438     NULL,                               /* pAbortPath */
 439     dibdrv_AlphaBlend,                  /* pAlphaBlend */
 440     NULL,                               /* pAngleArc */
 441     dibdrv_Arc,                         /* pArc */
 442     dibdrv_ArcTo,                       /* pArcTo */
 443     NULL,                               /* pBeginPath */
 444     dibdrv_BlendImage,                  /* pBlendImage */
 445     NULL,                               /* pChoosePixelFormat */
 446     dibdrv_Chord,                       /* pChord */
 447     NULL,                               /* pCloseFigure */
 448     dibdrv_CopyBitmap,                  /* pCopyBitmap */
 449     NULL,                               /* pCreateBitmap */
 450     NULL,                               /* pCreateCompatibleDC */
 451     dibdrv_CreateDC,                    /* pCreateDC */
 452     dibdrv_DeleteBitmap,                /* pDeleteBitmap */
 453     dibdrv_DeleteDC,                    /* pDeleteDC */
 454     NULL,                               /* pDeleteObject */
 455     NULL,                               /* pDescribePixelFormat */
 456     NULL,                               /* pDeviceCapabilities */
 457     dibdrv_Ellipse,                     /* pEllipse */
 458     NULL,                               /* pEndDoc */
 459     NULL,                               /* pEndPage */
 460     NULL,                               /* pEndPath */
 461     NULL,                               /* pEnumFonts */
 462     NULL,                               /* pEnumICMProfiles */
 463     NULL,                               /* pExcludeClipRect */
 464     NULL,                               /* pExtDeviceMode */
 465     NULL,                               /* pExtEscape */
 466     dibdrv_ExtFloodFill,                /* pExtFloodFill */
 467     NULL,                               /* pExtSelectClipRgn */
 468     dibdrv_ExtTextOut,                  /* pExtTextOut */
 469     NULL,                               /* pFillPath */
 470     NULL,                               /* pFillRgn */
 471     NULL,                               /* pFlattenPath */
 472     NULL,                               /* pFontIsLinked */
 473     NULL,                               /* pFrameRgn */
 474     NULL,                               /* pGdiComment */
 475     NULL,                               /* pGdiRealizationInfo */
 476     NULL,                               /* pGetBoundsRect */
 477     NULL,                               /* pGetCharABCWidths */
 478     NULL,                               /* pGetCharABCWidthsI */
 479     NULL,                               /* pGetCharWidth */
 480     NULL,                               /* pGetDeviceCaps */
 481     dibdrv_GetDeviceGammaRamp,          /* pGetDeviceGammaRamp */
 482     NULL,                               /* pGetFontData */
 483     NULL,                               /* pGetFontUnicodeRanges */
 484     NULL,                               /* pGetGlyphIndices */
 485     NULL,                               /* pGetGlyphOutline */
 486     NULL,                               /* pGetICMProfile */
 487     dibdrv_GetImage,                    /* pGetImage */
 488     NULL,                               /* pGetKerningPairs */
 489     dibdrv_GetNearestColor,             /* pGetNearestColor */
 490     NULL,                               /* pGetOutlineTextMetrics */
 491     dibdrv_GetPixel,                    /* pGetPixel */
 492     NULL,                               /* pGetPixelFormat */
 493     NULL,                               /* pGetSystemPaletteEntries */
 494     NULL,                               /* pGetTextCharsetInfo */
 495     NULL,                               /* pGetTextExtentExPoint */
 496     NULL,                               /* pGetTextExtentExPointI */
 497     NULL,                               /* pGetTextFace */
 498     NULL,                               /* pGetTextMetrics */
 499     dibdrv_GradientFill,                /* pGradientFill */
 500     NULL,                               /* pIntersectClipRect */
 501     NULL,                               /* pInvertRgn */
 502     dibdrv_LineTo,                      /* pLineTo */
 503     NULL,                               /* pModifyWorldTransform */
 504     NULL,                               /* pMoveTo */
 505     NULL,                               /* pOffsetClipRgn */
 506     NULL,                               /* pOffsetViewportOrg */
 507     NULL,                               /* pOffsetWindowOrg */
 508     dibdrv_PaintRgn,                    /* pPaintRgn */
 509     dibdrv_PatBlt,                      /* pPatBlt */
 510     dibdrv_Pie,                         /* pPie */
 511     NULL,                               /* pPolyBezier */
 512     NULL,                               /* pPolyBezierTo */
 513     NULL,                               /* pPolyDraw */
 514     dibdrv_PolyPolygon,                 /* pPolyPolygon */
 515     dibdrv_PolyPolyline,                /* pPolyPolyline */
 516     dibdrv_Polygon,                     /* pPolygon */
 517     dibdrv_Polyline,                    /* pPolyline */
 518     NULL,                               /* pPolylineTo */
 519     dibdrv_PutImage,                    /* pPutImage */
 520     NULL,                               /* pRealizeDefaultPalette */
 521     NULL,                               /* pRealizePalette */
 522     dibdrv_Rectangle,                   /* pRectangle */
 523     NULL,                               /* pResetDC */
 524     NULL,                               /* pRestoreDC */
 525     dibdrv_RoundRect,                   /* pRoundRect */
 526     NULL,                               /* pSaveDC */
 527     NULL,                               /* pScaleViewportExt */
 528     NULL,                               /* pScaleWindowExt */
 529     dibdrv_SelectBitmap,                /* pSelectBitmap */
 530     dibdrv_SelectBrush,                 /* pSelectBrush */
 531     NULL,                               /* pSelectClipPath */
 532     NULL,                               /* pSelectFont */
 533     NULL,                               /* pSelectPalette */
 534     dibdrv_SelectPen,                   /* pSelectPen */
 535     NULL,                               /* pSetArcDirection */
 536     NULL,                               /* pSetBkColor */
 537     NULL,                               /* pSetBkMode */
 538     dibdrv_SetBoundsRect,               /* pSetBoundsRect */
 539     dibdrv_SetDCBrushColor,             /* pSetDCBrushColor */
 540     dibdrv_SetDCPenColor,               /* pSetDCPenColor */
 541     NULL,                               /* pSetDIBitsToDevice */
 542     dibdrv_SetDeviceClipping,           /* pSetDeviceClipping */
 543     dibdrv_SetDeviceGammaRamp,          /* pSetDeviceGammaRamp */
 544     NULL,                               /* pSetLayout */
 545     NULL,                               /* pSetMapMode */
 546     NULL,                               /* pSetMapperFlags */
 547     dibdrv_SetPixel,                    /* pSetPixel */
 548     NULL,                               /* pSetPixelFormat */
 549     NULL,                               /* pSetPolyFillMode */
 550     NULL,                               /* pSetROP2 */
 551     NULL,                               /* pSetRelAbs */
 552     NULL,                               /* pSetStretchBltMode */
 553     NULL,                               /* pSetTextAlign */
 554     NULL,                               /* pSetTextCharacterExtra */
 555     NULL,                               /* pSetTextColor */
 556     NULL,                               /* pSetTextJustification */
 557     NULL,                               /* pSetViewportExt */
 558     NULL,                               /* pSetViewportOrg */
 559     NULL,                               /* pSetWindowExt */
 560     NULL,                               /* pSetWindowOrg */
 561     NULL,                               /* pSetWorldTransform */
 562     NULL,                               /* pStartDoc */
 563     NULL,                               /* pStartPage */
 564     dibdrv_StretchBlt,                  /* pStretchBlt */
 565     NULL,                               /* pStretchDIBits */
 566     NULL,                               /* pStrokeAndFillPath */
 567     NULL,                               /* pStrokePath */
 568     NULL,                               /* pSwapBuffers */
 569     NULL,                               /* pUnrealizePalette */
 570     NULL,                               /* pWidenPath */
 571     NULL,                               /* pwglCopyContext */
 572     NULL,                               /* pwglCreateContext */
 573     NULL,                               /* pwglCreateContextAttribsARB */
 574     NULL,                               /* pwglDeleteContext */
 575     NULL,                               /* pwglGetProcAddress */
 576     NULL,                               /* pwglMakeContextCurrentARB */
 577     NULL,                               /* pwglMakeCurrent */
 578     NULL,                               /* pwglSetPixelFormatWINE */
 579     NULL,                               /* pwglShareLists */
 580     NULL,                               /* pwglUseFontBitmapsA */
 581     NULL,                               /* pwglUseFontBitmapsW */
 582     GDI_PRIORITY_DIB_DRV                /* priority */
 583 };