reactos/subsys/win32k/dib/dib16bpp.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: dib16bpp.c,v 1.22 2004/04/05 21:26:24 navaraf Exp $ */
  20 #undef WIN32_LEAN_AND_MEAN
  21 #include <windows.h>
  22 #include <stdlib.h>
  23 #include <math.h>
  24 #include <debug.h>
  25 #include <ddk/winddi.h>
  26 #include <win32k/bitmaps.h>
  27 #include <win32k/brush.h>
  28 #include <win32k/debug.h>
  29 #include <include/object.h>
  30 #include "../eng/objects.h"
  31 #include "dib.h"
  32
  33 VOID
  34 DIB_16BPP_PutPixel(PSURFOBJ SurfObj, LONG x, LONG y, ULONG c)
  35 {
  36   PBYTE byteaddr = SurfObj->pvScan0 + y * SurfObj->lDelta;
  37   PWORD addr = (PWORD)byteaddr + x;
  38
  39   *addr = (WORD)c;
  40 }
  41
  42 ULONG
  43 DIB_16BPP_GetPixel(PSURFOBJ SurfObj, LONG x, LONG y)
  44 {
  45   PBYTE byteaddr = SurfObj->pvScan0 + y * SurfObj->lDelta;
  46   PWORD addr = (PWORD)byteaddr + x;
  47
  48   return (ULONG)(*addr);
  49 }
  50
  51 VOID
  52 DIB_16BPP_HLine(PSURFOBJ SurfObj, LONG x1, LONG x2, LONG y, ULONG c)
  53 {
  54   PBYTE byteaddr = SurfObj->pvScan0 + y * SurfObj->lDelta;
  55   PWORD addr = (PWORD)byteaddr + x1;
  56   LONG cx = x1;
  57
  58   while(cx < x2) {
  59     *addr = (WORD)c;
  60     ++addr;
  61     ++cx;
  62   }
  63 }
  64
  65 VOID
  66 DIB_16BPP_VLine(PSURFOBJ SurfObj, LONG x, LONG y1, LONG y2, ULONG c)
  67 {
  68   PBYTE byteaddr = SurfObj->pvScan0 + y1 * SurfObj->lDelta;
  69   PWORD addr = (PWORD)byteaddr + x;
  70   LONG lDelta = SurfObj->lDelta;
  71
  72   byteaddr = (PBYTE)addr;
  73   while(y1++ < y2) {
  74     *addr = (WORD)c;
  75
  76     byteaddr += lDelta;
  77     addr = (PWORD)byteaddr;
  78   }
  79 }
  80
  81 BOOLEAN STATIC
  82 DIB_16BPP_BitBltSrcCopy(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
  83                         SURFGDI *DestGDI,  SURFGDI *SourceGDI,
  84                         PRECTL  DestRect,  POINTL  *SourcePoint,
  85                         XLATEOBJ *ColorTranslation)
  86 {
  87   LONG     i, j, sx, sy, xColor, f1;
  88   PBYTE    SourceBits, DestBits, SourceLine, DestLine;
  89   PBYTE    SourceBits_4BPP, SourceLine_4BPP;
  90   DestBits = DestSurf->pvScan0 + (DestRect->top * DestSurf->lDelta) + 2 * DestRect->left;
  91
  92   switch(SourceGDI->BitsPerPixel)
  93   {
  94     case 1:
  95       sx = SourcePoint->x;
  96       sy = SourcePoint->y;
  97
  98       for (j=DestRect->top; j<DestRect->bottom; j++)
  99       {
 100         sx = SourcePoint->x;
 101         for (i=DestRect->left; i<DestRect->right; i++)
 102         {
 103           if(DIB_1BPP_GetPixel(SourceSurf, sx, sy) == 0)
 104           {
 105             DIB_16BPP_PutPixel(DestSurf, i, j, XLATEOBJ_iXlate(ColorTranslation, 0));
 106           } else {
 107             DIB_16BPP_PutPixel(DestSurf, i, j, XLATEOBJ_iXlate(ColorTranslation, 1));
 108           }
 109           sx++;
 110         }
 111         sy++;
 112       }
 113       break;
 114
 115     case 4:
 116       SourceBits_4BPP = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + (SourcePoint->x >> 1);
 117
 118       for (j=DestRect->top; j<DestRect->bottom; j++)
 119       {
 120         SourceLine_4BPP = SourceBits_4BPP;
 121         sx = SourcePoint->x;
 122         f1 = sx & 1;
 123
 124         for (i=DestRect->left; i<DestRect->right; i++)
 125         {
 126           xColor = XLATEOBJ_iXlate(ColorTranslation,
 127               (*SourceLine_4BPP & altnotmask[f1]) >> (4 * (1 - f1)));
 128           DIB_16BPP_PutPixel(DestSurf, i, j, xColor);
 129           if(f1 == 1) { SourceLine_4BPP++; f1 = 0; } else { f1 = 1; }
 130           sx++;
 131         }
 132
 133         SourceBits_4BPP += SourceSurf->lDelta;
 134       }
 135       break;
 136
 137     case 8:
 138       SourceLine = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + SourcePoint->x;
 139       DestLine = DestBits;
 140
 141       for (j = DestRect->top; j < DestRect->bottom; j++)
 142       {
 143         SourceBits = SourceLine;
 144         DestBits = DestLine;
 145
 146         for (i = DestRect->left; i < DestRect->right; i++)
 147         {
 148           *((WORD *)DestBits) = (WORD)XLATEOBJ_iXlate(ColorTranslation, *SourceBits);
 149           SourceBits += 1;
 150           DestBits += 2;
 151         }
 152
 153         SourceLine += SourceSurf->lDelta;
 154         DestLine += DestSurf->lDelta;
 155       }
 156       break;
 157
 158     case 16:
 159       if (NULL == ColorTranslation || 0 != (ColorTranslation->flXlate & XO_TRIVIAL))
 160       {
 161         if (DestRect->top < SourcePoint->y)
 162           {
 163             SourceBits = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + 2 * SourcePoint->x;
 164             for (j = DestRect->top; j < DestRect->bottom; j++)
 165               {
 166                 RtlMoveMemory(DestBits, SourceBits, 2 * (DestRect->right - DestRect->left));
 167                 SourceBits += SourceSurf->lDelta;
 168                 DestBits += DestSurf->lDelta;
 169               }
 170           }
 171         else
 172           {
 173             SourceBits = SourceSurf->pvScan0 + ((SourcePoint->y + DestRect->bottom - DestRect->top - 1) * SourceSurf->lDelta) + 2 * SourcePoint->x;
 174             DestBits = DestSurf->pvScan0 + ((DestRect->bottom - 1) * DestSurf->lDelta) + 2 * DestRect->left;
 175             for (j = DestRect->bottom - 1; DestRect->top <= j; j--)
 176               {
 177                 RtlMoveMemory(DestBits, SourceBits, 2 * (DestRect->right - DestRect->left));
 178                 SourceBits -= SourceSurf->lDelta;
 179                 DestBits -= DestSurf->lDelta;
 180               }
 181           }
 182       }
 183       else
 184       {
 185         if (DestRect->top < SourcePoint->y)
 186           {
 187             SourceLine = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + 2 * SourcePoint->x;
 188             DestLine = DestBits;
 189             for (j = DestRect->top; j < DestRect->bottom; j++)
 190               {
 191                 SourceBits = SourceLine;
 192                 DestBits = DestLine;
 193                 for (i = DestRect->left; i < DestRect->right; i++)
 194                   {
 195                     *((WORD *)DestBits) = (WORD)XLATEOBJ_iXlate(ColorTranslation, *((WORD *)SourceBits));
 196                     SourceBits += 2;
 197                     DestBits += 2;
 198                   }
 199                 SourceLine += SourceSurf->lDelta;
 200                 DestLine += DestSurf->lDelta;
 201               }
 202           }
 203         else
 204           {
 205             SourceLine = SourceSurf->pvScan0 + ((SourcePoint->y + DestRect->bottom - DestRect->top - 1) * SourceSurf->lDelta) + 2 * SourcePoint->x;
 206             DestLine = DestSurf->pvScan0 + ((DestRect->bottom - 1) * DestSurf->lDelta) + 2 * DestRect->left;
 207             for (j = DestRect->bottom - 1; DestRect->top <= j; j--)
 208               {
 209                 SourceBits = SourceLine;
 210                 DestBits = DestLine;
 211                 for (i = DestRect->left; i < DestRect->right; i++)
 212                   {
 213                     *((WORD *)DestBits) = (WORD)XLATEOBJ_iXlate(ColorTranslation, *((WORD *)SourceBits));
 214                     SourceBits += 2;
 215                     DestBits += 2;
 216                   }
 217                 SourceLine -= SourceSurf->lDelta;
 218                 DestLine -= DestSurf->lDelta;
 219               }
 220           }
 221       }
 222       break;
 223
 224     case 24:
 225       SourceLine = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + 3 * SourcePoint->x;
 226       DestLine = DestBits;
 227
 228       for (j = DestRect->top; j < DestRect->bottom; j++)
 229       {
 230         SourceBits = SourceLine;
 231         DestBits = DestLine;
 232
 233         for (i = DestRect->left; i < DestRect->right; i++)
 234         {
 235           xColor = (*(SourceBits + 2) << 0x10) +
 236              (*(SourceBits + 1) << 0x08) +
 237              (*(SourceBits));
 238           *((WORD *)DestBits) = (WORD)XLATEOBJ_iXlate(ColorTranslation, xColor);
 239           SourceBits += 3;
 240           DestBits += 2;
 241         }
 242
 243         SourceLine += SourceSurf->lDelta;
 244         DestLine += DestSurf->lDelta;
 245       }
 246       break;
 247
 248     case 32:
 249       SourceLine = SourceSurf->pvScan0 + (SourcePoint->y * SourceSurf->lDelta) + 4 * SourcePoint->x;
 250       DestLine = DestBits;
 251
 252       for (j = DestRect->top; j < DestRect->bottom; j++)
 253       {
 254         SourceBits = SourceLine;
 255         DestBits = DestLine;
 256
 257         for (i = DestRect->left; i < DestRect->right; i++)
 258         {
 259           *((WORD *)DestBits) = (WORD)XLATEOBJ_iXlate(ColorTranslation, *((PDWORD) SourceBits));
 260           SourceBits += 4;
 261           DestBits += 2;
 262         }
 263
 264         SourceLine += SourceSurf->lDelta;
 265         DestLine += DestSurf->lDelta;
 266       }
 267       break;
 268
 269     default:
 270       DbgPrint("DIB_16BPP_Bitblt: Unhandled Source BPP: %u\n", SourceGDI->BitsPerPixel);
 271       return FALSE;
 272   }
 273
 274   return TRUE;
 275 }
 276
 277 BOOLEAN
 278 DIB_16BPP_BitBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
 279                  SURFGDI *DestGDI,  SURFGDI *SourceGDI,
 280                  PRECTL  DestRect,  POINTL  *SourcePoint,
 281                  PBRUSHOBJ Brush, PPOINTL BrushOrigin,
 282                  XLATEOBJ *ColorTranslation, ULONG Rop4)
 283 {
 284    ULONG X, Y;
 285    ULONG SourceX, SourceY;
 286    ULONG Dest, Source, Pattern = 0;
 287    PULONG DestBits;
 288    BOOL UsesSource;
 289    BOOL UsesPattern;
 290    LONG RoundedRight;
 291    /* Pattern brushes */
 292    PGDIBRUSHOBJ GdiBrush;
 293    HBITMAP PatternSurface = NULL;
 294    PSURFOBJ PatternObj;
 295    ULONG PatternWidth, PatternHeight;
 296
 297    if (Rop4 == SRCCOPY)
 298    {
 299       return DIB_16BPP_BitBltSrcCopy(
 300          DestSurf,
 301          SourceSurf,
 302          DestGDI,
 303          SourceGDI,
 304          DestRect,
 305          SourcePoint,
 306          ColorTranslation);
 307    }
 308
 309    UsesSource = ((Rop4 & 0xCC0000) >> 2) != (Rop4 & 0x330000);
 310    UsesPattern = ((Rop4 & 0xF00000) >> 4) != (Rop4 & 0x0F0000);
 311
 312    if (UsesPattern)
 313    {
 314       if (Brush == NULL)
 315       {
 316          UsesPattern = FALSE;
 317       } else
 318       if (Brush->iSolidColor == 0xFFFFFFFF)
 319       {
 320          PBITMAPOBJ PatternBitmap;
 321
 322          GdiBrush = CONTAINING_RECORD(
 323             Brush,
 324             GDIBRUSHOBJ,
 325             BrushObject);
 326
 327          PatternBitmap = BITMAPOBJ_LockBitmap(GdiBrush->hbmPattern);
 328          PatternSurface = BitmapToSurf(PatternBitmap, NULL);
 329          BITMAPOBJ_UnlockBitmap(GdiBrush->hbmPattern);
 330
 331          PatternObj = (PSURFOBJ)AccessUserObject((ULONG)PatternSurface);
 332          PatternWidth = PatternObj->sizlBitmap.cx;
 333          PatternHeight = PatternObj->sizlBitmap.cy;
 334       }
 335    }
 336
 337    RoundedRight = DestRect->right - ((DestRect->right - DestRect->left) & 0x1);
 338    SourceY = SourcePoint->y;
 339    DestBits = (PULONG)(
 340       DestSurf->pvScan0 +
 341       (DestRect->left << 1) +
 342       DestRect->top * DestSurf->lDelta);
 343
 344    for (Y = DestRect->top; Y < DestRect->bottom; Y++)
 345    {
 346       SourceX = SourcePoint->x;
 347       for (X = DestRect->left; X < RoundedRight; X += 2, DestBits++, SourceX += 2)
 348       {
 349          Dest = *DestBits;
 350
 351          if (UsesSource)
 352          {
 353             Source = DIB_GetSource(SourceSurf, SourceGDI, SourceX, SourceY, ColorTranslation);
 354             Source |= DIB_GetSource(SourceSurf, SourceGDI, SourceX + 1, SourceY, ColorTranslation) << 16;
 355          }
 356
 357          if (UsesPattern)
 358          {
 359             if (Brush->iSolidColor == 0xFFFFFFFF)
 360             {
 361                Pattern = (DIB_1BPP_GetPixel(PatternObj, X % PatternWidth, Y % PatternHeight) ? GdiBrush->crFore : GdiBrush->crBack);
 362                Pattern |= (DIB_1BPP_GetPixel(PatternObj, (X + 1) % PatternWidth, Y % PatternHeight) ? GdiBrush->crFore : GdiBrush->crBack) << 16;
 363             }
 364             else
 365             {
 366                Pattern = (Brush->iSolidColor & 0xFFFF) |
 367                         ((Brush->iSolidColor & 0xFFFF) << 16);
 368             }
 369          }
 370
 371          *DestBits = DIB_DoRop(Rop4, Dest, Source, Pattern);
 372       }
 373
 374       if (X < DestRect->right)
 375       {
 376          Dest = *((PUSHORT)DestBits);
 377
 378          if (UsesSource)
 379          {
 380             Source = DIB_GetSource(SourceSurf, SourceGDI, SourceX, SourceY, ColorTranslation);
 381          }
 382
 383          if (UsesPattern)
 384          {
 385             if (Brush->iSolidColor == 0xFFFFFFFF)
 386                Pattern = DIB_1BPP_GetPixel(PatternObj, X % PatternWidth, Y % PatternHeight) ? GdiBrush->crFore : GdiBrush->crBack;
 387             else
 388                Pattern = Brush->iSolidColor & 0xFFFF;
 389          }
 390
 391          DIB_16BPP_PutPixel(DestSurf, X, Y, DIB_DoRop(Rop4, Dest, Source, Pattern) & 0xFFFF);
 392          DestBits = (PULONG)((ULONG_PTR)DestBits + 2);
 393       }
 394
 395       SourceY++;
 396       DestBits = (PULONG)(
 397          (ULONG_PTR)DestBits -
 398          ((DestRect->right - DestRect->left) << 1) +
 399          DestSurf->lDelta);
 400    }
 401
 402    if (PatternSurface != NULL)
 403       EngDeleteSurface(PatternSurface);
 404
 405    return TRUE;
 406 }
 407
 408
 409 /*
 410 =======================================
 411  Stretching functions goes below
 412  Some parts of code are based on an
 413  article "Bresenhame image scaling"
 414  Dr. Dobb Journal, May 2002
 415 =======================================
 416 */
 417
 418 typedef unsigned short PIXEL;
 419
 420 /* 16-bit HiColor (565 format) */
 421 inline PIXEL average16(PIXEL a, PIXEL b)
 422 {
 423 // This one doesn't work
 424 /*
 425   if (a == b) {
 426     return a;
 427   } else {
 428     unsigned short mask = ~ (((a | b) & 0x0410) << 1);
 429     return ((a & mask) + (b & mask)) >> 1;
 430   }*/ /* if */
 431
 432 // This one should be correct, but it's too long
 433 /*
 434   unsigned char r1, g1, b1, r2, g2, b2, rr, gr, br;
 435   unsigned short res;
 436
 437   r1 = (a & 0xF800) >> 11;
 438   g1 = (a & 0x7E0) >> 5;
 439   b1 = (a & 0x1F);
 440
 441   r2 = (b & 0xF800) >> 11;
 442   g2 = (b & 0x7E0) >> 5;
 443   b2 = (b & 0x1F);
 444
 445   rr = (r1+r2) / 2;
 446   gr = (g1+g2) / 2;
 447   br = (b1+b2) / 2;
 448
 449   res = (rr << 11) + (gr << 5) + br;
 450
 451   return res;
 452 */
 453   return a; // FIXME: Depend on SetStretchMode
 454 }
 455
 456 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 457 void ScaleLineAvg16(PIXEL *Target, PIXEL *Source, int SrcWidth, int TgtWidth)
 458 {
 459   int NumPixels = TgtWidth;
 460   int IntPart = SrcWidth / TgtWidth;
 461   int FractPart = SrcWidth % TgtWidth;
 462   int Mid = TgtWidth >> 1;
 463   int E = 0;
 464   int skip;
 465   PIXEL p;
 466
 467   skip = (TgtWidth < SrcWidth) ? 0 : (TgtWidth / (2*SrcWidth) + 1);
 468   NumPixels -= skip;
 469
 470   while (NumPixels-- > 0) {
 471     p = *Source;
 472     if (E >= Mid)
 473       p = average16(p, *(Source+1));
 474     *Target++ = p;
 475     Source += IntPart;
 476     E += FractPart;
 477     if (E >= TgtWidth) {
 478       E -= TgtWidth;
 479       Source++;
 480     } /* if */
 481   } /* while */
 482   while (skip-- > 0)
 483     *Target++ = *Source;
 484 }
 485
 486 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 487 void ScaleRectAvg16(PIXEL *Target, PIXEL *Source, int SrcWidth, int SrcHeight,
 488                   int TgtWidth, int TgtHeight, int srcPitch, int dstPitch)
 489 {
 490   int NumPixels = TgtHeight;
 491   int IntPart = ((SrcHeight / TgtHeight) * srcPitch) >> 1; //(SrcHeight / TgtHeight) * SrcWidth;
 492   int FractPart = SrcHeight % TgtHeight;
 493   int Mid = TgtHeight >> 1;
 494   int E = 0;
 495   int skip;
 496   PIXEL *ScanLine, *ScanLineAhead;
 497   PIXEL *PrevSource = NULL;
 498   PIXEL *PrevSourceAhead = NULL;
 499
 500   skip = (TgtHeight < SrcHeight) ? 0 : (TgtHeight / (2*SrcHeight) + 1);
 501   NumPixels -= skip;
 502
 503   ScanLine = (PIXEL*)ExAllocatePool(NonPagedPool, TgtWidth*sizeof(PIXEL)); // FIXME: Should we use PagedPool here?
 504   ScanLineAhead = (PIXEL *)ExAllocatePool(NonPagedPool, TgtWidth*sizeof(PIXEL));
 505
 506   while (NumPixels-- > 0) {
 507     if (Source != PrevSource) {
 508       if (Source == PrevSourceAhead) {
 509         /* the next scan line has already been scaled and stored in
 510          * ScanLineAhead; swap the buffers that ScanLine and ScanLineAhead
 511          * point to
 512          */
 513         PIXEL *tmp = ScanLine;
 514         ScanLine = ScanLineAhead;
 515         ScanLineAhead = tmp;
 516       } else {
 517         ScaleLineAvg16(ScanLine, Source, SrcWidth, TgtWidth);
 518       } /* if */
 519       PrevSource = Source;
 520     } /* if */
 521
 522     if (E >= Mid && PrevSourceAhead != (PIXEL *)((BYTE *)Source + srcPitch)) {
 523       int x;
 524       ScaleLineAvg16(ScanLineAhead, (PIXEL *)((BYTE *)Source + srcPitch), SrcWidth, TgtWidth);
 525       for (x = 0; x < TgtWidth; x++)
 526         ScanLine[x] = average16(ScanLine[x], ScanLineAhead[x]);
 527       PrevSourceAhead = (PIXEL *)((BYTE *)Source + srcPitch);
 528     } /* if */
 529
 530     memcpy(Target, ScanLine, TgtWidth*sizeof(PIXEL));
 531     Target = (PIXEL *)((BYTE *)Target + dstPitch);
 532     Source += IntPart;
 533     E += FractPart;
 534     if (E >= TgtHeight) {
 535       E -= TgtHeight;
 536       Source = (PIXEL *)((BYTE *)Source + srcPitch);
 537     } /* if */
 538   } /* while */
 539
 540   if (skip > 0 && Source != PrevSource)
 541     ScaleLineAvg16(ScanLine, Source, SrcWidth, TgtWidth);
 542   while (skip-- > 0) {
 543     memcpy(Target, ScanLine, TgtWidth*sizeof(PIXEL));
 544     Target = (PIXEL *)((BYTE *)Target + dstPitch);
 545   } /* while */
 546
 547   ExFreePool(ScanLine);
 548   ExFreePool(ScanLineAhead);
 549 }
 550
 551 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 552 BOOLEAN DIB_16BPP_StretchBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
 553                             SURFGDI *DestGDI, SURFGDI *SourceGDI,
 554                             RECTL* DestRect, RECTL *SourceRect,
 555                             POINTL* MaskOrigin, POINTL* BrushOrigin,
 556                                         XLATEOBJ *ColorTranslation, ULONG Mode)
 557 {
 558   BYTE *SourceLine, *DestLine;
 559
 560   DbgPrint("DIB_16BPP_StretchBlt: Source BPP: %u, srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
 561      SourceGDI->BitsPerPixel, SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom,
 562      DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
 563
 564     switch(SourceGDI->BitsPerPixel)
 565     {
 566       case 1:
 567          return FALSE;
 568       break;
 569
 570       case 4:
 571          return FALSE;
 572       break;
 573
 574       case 8:
 575          return FALSE;
 576       break;
 577
 578       case 16:
 579             SourceLine = SourceSurf->pvScan0 + (SourceRect->top * SourceSurf->lDelta) + 2 * SourceRect->left;
 580             DestLine = DestSurf->pvScan0 + (DestRect->top * DestSurf->lDelta) + 2 * DestRect->left;
 581
 582         ScaleRectAvg16((PIXEL *)DestLine, (PIXEL *)SourceLine,
 583            SourceRect->right-SourceRect->left, SourceRect->bottom-SourceRect->top,
 584            DestRect->right-DestRect->left, DestRect->bottom-DestRect->top, SourceSurf->lDelta, DestSurf->lDelta);
 585       break;
 586
 587       case 24:
 588          return FALSE;
 589       break;
 590
 591       case 32:
 592          return FALSE;
 593       break;
 594
 595       default:
 596          DbgPrint("DIB_16BPP_StretchBlt: Unhandled Source BPP: %u\n", SourceGDI->BitsPerPixel);
 597       return FALSE;
 598     }
 599
 600
 601
 602   return TRUE;
 603 }
 604
 605 /* EOF */