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 1.27 2004/04/07 15:37:49 weiden 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 wd, Dest, Source, Pattern = 0, PatternY;
 287    PULONG DestBits;
 288    BOOL UsesSource;
 289    BOOL UsesPattern;
 290    ULONG 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)) && Brush;
 311
 312    if (UsesPattern)
 313    {
 314       if (Brush->iSolidColor == 0xFFFFFFFF)
 315       {
 316          PBITMAPOBJ PatternBitmap;
 317
 318          GdiBrush = CONTAINING_RECORD(
 319             Brush,
 320             GDIBRUSHOBJ,
 321             BrushObject);
 322
 323          PatternBitmap = BITMAPOBJ_LockBitmap(GdiBrush->hbmPattern);
 324          PatternSurface = BitmapToSurf(PatternBitmap, NULL);
 325          BITMAPOBJ_UnlockBitmap(GdiBrush->hbmPattern);
 326
 327          PatternObj = (PSURFOBJ)AccessUserObject((ULONG)PatternSurface);
 328          PatternWidth = PatternObj->sizlBitmap.cx;
 329          PatternHeight = PatternObj->sizlBitmap.cy;
 330
 331          UsesPattern = TRUE;
 332       }
 333       else
 334       {
 335          UsesPattern = FALSE;
 336          Pattern = (Brush->iSolidColor & 0xFFFF) |
 337                     ((Brush->iSolidColor & 0xFFFF) << 16);
 338       }
 339    }
 340
 341    wd = ((DestRect->right - DestRect->left) << 1) - DestSurf->lDelta;
 342    RoundedRight = DestRect->right - ((DestRect->right - DestRect->left) & 0x1);
 343    SourceY = SourcePoint->y;
 344    DestBits = (PULONG)(
 345       DestSurf->pvScan0 +
 346       (DestRect->left << 1) +
 347       DestRect->top * DestSurf->lDelta);
 348
 349    for (Y = DestRect->top; Y < DestRect->bottom; Y++)
 350    {
 351       SourceX = SourcePoint->x;
 352
 353       if(UsesPattern)
 354         PatternY = Y % PatternHeight;
 355
 356       for (X = DestRect->left; X < RoundedRight; X += 2, DestBits++, SourceX += 2)
 357       {
 358          Dest = *DestBits;
 359
 360          if (UsesSource)
 361          {
 362             Source = DIB_GetSource(SourceSurf, SourceGDI, SourceX, SourceY, ColorTranslation);
 363             Source |= DIB_GetSource(SourceSurf, SourceGDI, SourceX + 1, SourceY, ColorTranslation) << 16;
 364          }
 365
 366          if (UsesPattern)
 367          {
 368             Pattern = (DIB_1BPP_GetPixel(PatternObj, X % PatternWidth, PatternY) ? GdiBrush->crFore : GdiBrush->crBack);
 369             Pattern |= (DIB_1BPP_GetPixel(PatternObj, (X + 1) % PatternWidth, PatternY) ? GdiBrush->crFore : GdiBrush->crBack) << 16;
 370          }
 371
 372          *DestBits = DIB_DoRop(Rop4, Dest, Source, Pattern);
 373       }
 374
 375       if (X < DestRect->right)
 376       {
 377          Dest = *((PUSHORT)DestBits);
 378
 379          if (UsesSource)
 380          {
 381             Source = DIB_GetSource(SourceSurf, SourceGDI, SourceX, SourceY, ColorTranslation);
 382          }
 383
 384          if (UsesPattern)
 385          {
 386             Pattern = DIB_1BPP_GetPixel(PatternObj, X % PatternWidth, PatternY) ? GdiBrush->crFore : GdiBrush->crBack;
 387          }
 388
 389          DIB_16BPP_PutPixel(DestSurf, X, Y, DIB_DoRop(Rop4, Dest, Source, Pattern) & 0xFFFF);
 390          DestBits = (PULONG)((ULONG_PTR)DestBits + 2);
 391       }
 392
 393       SourceY++;
 394       DestBits = (PULONG)(
 395          (ULONG_PTR)DestBits - wd);
 396    }
 397
 398    if (PatternSurface != NULL)
 399       EngDeleteSurface(PatternSurface);
 400
 401    return TRUE;
 402 }
 403
 404
 405 /*
 406 =======================================
 407  Stretching functions goes below
 408  Some parts of code are based on an
 409  article "Bresenhame image scaling"
 410  Dr. Dobb Journal, May 2002
 411 =======================================
 412 */
 413
 414 typedef unsigned short PIXEL;
 415
 416 /* 16-bit HiColor (565 format) */
 417 inline PIXEL average16(PIXEL a, PIXEL b)
 418 {
 419 // This one doesn't work
 420 /*
 421   if (a == b) {
 422     return a;
 423   } else {
 424     unsigned short mask = ~ (((a | b) & 0x0410) << 1);
 425     return ((a & mask) + (b & mask)) >> 1;
 426   }*/ /* if */
 427
 428 // This one should be correct, but it's too long
 429 /*
 430   unsigned char r1, g1, b1, r2, g2, b2, rr, gr, br;
 431   unsigned short res;
 432
 433   r1 = (a & 0xF800) >> 11;
 434   g1 = (a & 0x7E0) >> 5;
 435   b1 = (a & 0x1F);
 436
 437   r2 = (b & 0xF800) >> 11;
 438   g2 = (b & 0x7E0) >> 5;
 439   b2 = (b & 0x1F);
 440
 441   rr = (r1+r2) / 2;
 442   gr = (g1+g2) / 2;
 443   br = (b1+b2) / 2;
 444
 445   res = (rr << 11) + (gr << 5) + br;
 446
 447   return res;
 448 */
 449   return a; // FIXME: Depend on SetStretchMode
 450 }
 451
 452 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 453 void ScaleLineAvg16(PIXEL *Target, PIXEL *Source, int SrcWidth, int TgtWidth)
 454 {
 455   int NumPixels = TgtWidth;
 456   int IntPart = SrcWidth / TgtWidth;
 457   int FractPart = SrcWidth % TgtWidth;
 458   int Mid = TgtWidth >> 1;
 459   int E = 0;
 460   int skip;
 461   PIXEL p;
 462
 463   skip = (TgtWidth < SrcWidth) ? 0 : (TgtWidth / (2*SrcWidth) + 1);
 464   NumPixels -= skip;
 465
 466   while (NumPixels-- > 0) {
 467     p = *Source;
 468     if (E >= Mid)
 469       p = average16(p, *(Source+1));
 470     *Target++ = p;
 471     Source += IntPart;
 472     E += FractPart;
 473     if (E >= TgtWidth) {
 474       E -= TgtWidth;
 475       Source++;
 476     } /* if */
 477   } /* while */
 478   while (skip-- > 0)
 479     *Target++ = *Source;
 480 }
 481
 482 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 483 void ScaleRectAvg16(PIXEL *Target, PIXEL *Source, int SrcWidth, int SrcHeight,
 484                   int TgtWidth, int TgtHeight, int srcPitch, int dstPitch)
 485 {
 486   int NumPixels = TgtHeight;
 487   int IntPart = ((SrcHeight / TgtHeight) * srcPitch) >> 1; //(SrcHeight / TgtHeight) * SrcWidth;
 488   int FractPart = SrcHeight % TgtHeight;
 489   int Mid = TgtHeight >> 1;
 490   int E = 0;
 491   int skip;
 492   PIXEL *ScanLine, *ScanLineAhead;
 493   PIXEL *PrevSource = NULL;
 494   PIXEL *PrevSourceAhead = NULL;
 495
 496   skip = (TgtHeight < SrcHeight) ? 0 : (TgtHeight / (2*SrcHeight) + 1);
 497   NumPixels -= skip;
 498
 499   ScanLine = (PIXEL*)ExAllocatePool(NonPagedPool, TgtWidth*sizeof(PIXEL)); // FIXME: Should we use PagedPool here?
 500   ScanLineAhead = (PIXEL *)ExAllocatePool(NonPagedPool, TgtWidth*sizeof(PIXEL));
 501
 502   while (NumPixels-- > 0) {
 503     if (Source != PrevSource) {
 504       if (Source == PrevSourceAhead) {
 505         /* the next scan line has already been scaled and stored in
 506          * ScanLineAhead; swap the buffers that ScanLine and ScanLineAhead
 507          * point to
 508          */
 509         PIXEL *tmp = ScanLine;
 510         ScanLine = ScanLineAhead;
 511         ScanLineAhead = tmp;
 512       } else {
 513         ScaleLineAvg16(ScanLine, Source, SrcWidth, TgtWidth);
 514       } /* if */
 515       PrevSource = Source;
 516     } /* if */
 517
 518     if (E >= Mid && PrevSourceAhead != (PIXEL *)((BYTE *)Source + srcPitch)) {
 519       int x;
 520       ScaleLineAvg16(ScanLineAhead, (PIXEL *)((BYTE *)Source + srcPitch), SrcWidth, TgtWidth);
 521       for (x = 0; x < TgtWidth; x++)
 522         ScanLine[x] = average16(ScanLine[x], ScanLineAhead[x]);
 523       PrevSourceAhead = (PIXEL *)((BYTE *)Source + srcPitch);
 524     } /* if */
 525
 526     memcpy(Target, ScanLine, TgtWidth*sizeof(PIXEL));
 527     Target = (PIXEL *)((BYTE *)Target + dstPitch);
 528     Source += IntPart;
 529     E += FractPart;
 530     if (E >= TgtHeight) {
 531       E -= TgtHeight;
 532       Source = (PIXEL *)((BYTE *)Source + srcPitch);
 533     } /* if */
 534   } /* while */
 535
 536   if (skip > 0 && Source != PrevSource)
 537     ScaleLineAvg16(ScanLine, Source, SrcWidth, TgtWidth);
 538   while (skip-- > 0) {
 539     memcpy(Target, ScanLine, TgtWidth*sizeof(PIXEL));
 540     Target = (PIXEL *)((BYTE *)Target + dstPitch);
 541   } /* while */
 542
 543   ExFreePool(ScanLine);
 544   ExFreePool(ScanLineAhead);
 545 }
 546
 547 //NOTE: If you change something here, please do the same in other dibXXbpp.c files!
 548 BOOLEAN DIB_16BPP_StretchBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
 549                             SURFGDI *DestGDI, SURFGDI *SourceGDI,
 550                             RECTL* DestRect, RECTL *SourceRect,
 551                             POINTL* MaskOrigin, POINTL* BrushOrigin,
 552                                         XLATEOBJ *ColorTranslation, ULONG Mode)
 553 {
 554   BYTE *SourceLine, *DestLine;
 555
 556   DbgPrint("DIB_16BPP_StretchBlt: Source BPP: %u, srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
 557      SourceGDI->BitsPerPixel, SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom,
 558      DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
 559
 560     switch(SourceGDI->BitsPerPixel)
 561     {
 562       case 1:
 563          return FALSE;
 564       break;
 565
 566       case 4:
 567          return FALSE;
 568       break;
 569
 570       case 8:
 571          return FALSE;
 572       break;
 573
 574       case 16:
 575             SourceLine = SourceSurf->pvScan0 + (SourceRect->top * SourceSurf->lDelta) + 2 * SourceRect->left;
 576             DestLine = DestSurf->pvScan0 + (DestRect->top * DestSurf->lDelta) + 2 * DestRect->left;
 577
 578         ScaleRectAvg16((PIXEL *)DestLine, (PIXEL *)SourceLine,
 579            SourceRect->right-SourceRect->left, SourceRect->bottom-SourceRect->top,
 580            DestRect->right-DestRect->left, DestRect->bottom-DestRect->top, SourceSurf->lDelta, DestSurf->lDelta);
 581       break;
 582
 583       case 24:
 584          return FALSE;
 585       break;
 586
 587       case 32:
 588          return FALSE;
 589       break;
 590
 591       default:
 592          DbgPrint("DIB_16BPP_StretchBlt: Unhandled Source BPP: %u\n", SourceGDI->BitsPerPixel);
 593       return FALSE;
 594     }
 595
 596
 597
 598   return TRUE;
 599 }
 600
 601 BOOLEAN
 602 DIB_16BPP_TransparentBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
 603                          PSURFGDI DestGDI,  PSURFGDI SourceGDI,
 604                          RECTL*  DestRect,  POINTL  *SourcePoint,
 605                          XLATEOBJ *ColorTranslation, ULONG iTransColor)
 606 {
 607   ULONG RoundedRight, X, Y, SourceX, SourceY, Source, wd, Dest;
 608   ULONG *DestBits;
 609
 610   RoundedRight = DestRect->right - ((DestRect->right - DestRect->left) & 0x1);
 611   SourceY = SourcePoint->y;
 612   DestBits = (ULONG*)(DestSurf->pvScan0 +
 613                       (DestRect->left << 1) +
 614                       DestRect->top * DestSurf->lDelta);
 615   wd = DestSurf->lDelta - ((DestRect->right - DestRect->left) << 1);
 616
 617   for(Y = DestRect->top; Y < DestRect->bottom; Y++)
 618   {
 619     SourceX = SourcePoint->x;
 620     for(X = DestRect->left; X < RoundedRight; X += 2, DestBits++, SourceX += 2)
 621     {
 622       Dest = *DestBits;
 623
 624       Source = DIB_GetSourceIndex(SourceSurf, SourceGDI, SourceX, SourceY);
 625       if(Source != iTransColor)
 626       {
 627         Dest &= 0xFFFF0000;
 628         Dest |= (XLATEOBJ_iXlate(ColorTranslation, Source) & 0xFFFF);
 629       }
 630
 631       Source = DIB_GetSourceIndex(SourceSurf, SourceGDI, SourceX + 1, SourceY);
 632       if(Source != iTransColor)
 633       {
 634         Dest &= 0xFFFF;
 635         Dest |= (XLATEOBJ_iXlate(ColorTranslation, Source) << 16);
 636       }
 637
 638       *DestBits = Dest;
 639     }
 640
 641     if(X < DestRect->right)
 642     {
 643       Source = DIB_GetSourceIndex(SourceSurf, SourceGDI, SourceX, SourceY);
 644       if(Source != iTransColor)
 645       {
 646         *((USHORT*)DestBits) = (USHORT)(XLATEOBJ_iXlate(ColorTranslation, Source) << 16);
 647       }
 648
 649       DestBits = (PULONG)((ULONG_PTR)DestBits + 2);
 650     }
 651     SourceY++;
 652     DestBits = (ULONG*)((ULONG_PTR)DestBits + wd);
 653   }
 654
 655   return TRUE;
 656 }
 657
 658 /* EOF */