/*
 *  ReactOS W32 Subsystem
 *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/* $Id$ */

#include <w32k.h>

#define NDEBUG
#include <debug.h>

VOID
DIB_24BPP_PutPixel(SURFOBJ *SurfObj, LONG x, LONG y, ULONG c)
{
  PBYTE addr = (PBYTE)SurfObj->pvScan0 + (y * SurfObj->lDelta) + (x << 1) + x;
  *(PUSHORT)(addr) = c & 0xFFFF;
  *(addr + 2) = (c >> 16) & 0xFF;
}

ULONG
DIB_24BPP_GetPixel(SURFOBJ *SurfObj, LONG x, LONG y)
{
  PBYTE addr = (PBYTE)SurfObj->pvScan0 + y * SurfObj->lDelta + (x << 1) + x;
  return *(PUSHORT)(addr) + (*(addr + 2) << 16);
}



VOID
DIB_24BPP_VLine(SURFOBJ *SurfObj, LONG x, LONG y1, LONG y2, ULONG c)
{
  PBYTE addr = (PBYTE)SurfObj->pvScan0 + y1 * SurfObj->lDelta + (x << 1) + x;
  LONG lDelta = SurfObj->lDelta;

  c &= 0xFFFFFF;
  while(y1++ < y2) {
    *(PUSHORT)(addr) = c & 0xFFFF;
    *(addr + 2) = c >> 16;

    addr += lDelta;
  }
}

BOOLEAN
DIB_24BPP_BitBltSrcCopy(PBLTINFO BltInfo)
{
  LONG     i, j, sx, sy, xColor, f1;
  PBYTE    SourceBits, DestBits, SourceLine, DestLine;
  PBYTE    SourceBits_4BPP, SourceLine_4BPP;
  PWORD    SourceBits_16BPP, SourceLine_16BPP;

  DestBits = (PBYTE)BltInfo->DestSurface->pvScan0 + (BltInfo->DestRect.top * BltInfo->DestSurface->lDelta) + BltInfo->DestRect.left * 3;

  switch(BltInfo->SourceSurface->iBitmapFormat)
  {
    case BMF_1BPP:
      sx = BltInfo->SourcePoint.x;
      sy = BltInfo->SourcePoint.y;

      for (j=BltInfo->DestRect.top; j<BltInfo->DestRect.bottom; j++)
      {
        sx = BltInfo->SourcePoint.x;
        for (i=BltInfo->DestRect.left; i<BltInfo->DestRect.right; i++)
        {
          if(DIB_1BPP_GetPixel(BltInfo->SourceSurface, sx, sy) == 0)
          {
            DIB_24BPP_PutPixel(BltInfo->DestSurface, i, j, XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, 0));
          } else {
            DIB_24BPP_PutPixel(BltInfo->DestSurface, i, j, XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, 1));
          }
          sx++;
        }
        sy++;
      }
      break;

    case BMF_4BPP:
      SourceBits_4BPP = (PBYTE)BltInfo->SourceSurface->pvScan0 + (BltInfo->SourcePoint.y * BltInfo->SourceSurface->lDelta) + (BltInfo->SourcePoint.x >> 1);

      for (j=BltInfo->DestRect.top; j<BltInfo->DestRect.bottom; j++)
      {
        SourceLine_4BPP = SourceBits_4BPP;
        DestLine = DestBits;
        sx = BltInfo->SourcePoint.x;
        f1 = sx & 1;

        for (i=BltInfo->DestRect.left; i<BltInfo->DestRect.right; i++)
        {
          xColor = XLATEOBJ_iXlate(BltInfo->XlateSourceToDest,
              (*SourceLine_4BPP & altnotmask[f1]) >> (4 * (1 - f1)));
          *DestLine++ = xColor & 0xff;
          *(PWORD)DestLine = xColor >> 8;
          DestLine += 2;
          if(f1 == 1) { SourceLine_4BPP++; f1 = 0; } else { f1 = 1; }
          sx++;
        }

        SourceBits_4BPP += BltInfo->SourceSurface->lDelta;
        DestBits += BltInfo->DestSurface->lDelta;
      }
      break;

    case BMF_8BPP:
      SourceLine = (PBYTE)BltInfo->SourceSurface->pvScan0 + (BltInfo->SourcePoint.y * BltInfo->SourceSurface->lDelta) + BltInfo->SourcePoint.x;
      DestLine = DestBits;

      for (j = BltInfo->DestRect.top; j < BltInfo->DestRect.bottom; j++)
      {
        SourceBits = SourceLine;
        DestBits = DestLine;

        for (i = BltInfo->DestRect.left; i < BltInfo->DestRect.right; i++)
        {
          xColor = XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, *SourceBits);
          *DestBits = xColor & 0xff;
          *(PWORD)(DestBits + 1) = xColor >> 8;
          SourceBits += 1;
	  DestBits += 3;
        }

        SourceLine += BltInfo->SourceSurface->lDelta;
        DestLine += BltInfo->DestSurface->lDelta;
      }
      break;

    case BMF_16BPP:
      SourceBits_16BPP = (PWORD)((PBYTE)BltInfo->SourceSurface->pvScan0 + (BltInfo->SourcePoint.y * BltInfo->SourceSurface->lDelta) + 2 * BltInfo->SourcePoint.x);

      for (j=BltInfo->DestRect.top; j<BltInfo->DestRect.bottom; j++)
      {
        SourceLine_16BPP = SourceBits_16BPP;
        DestLine = DestBits;

        for (i=BltInfo->DestRect.left; i<BltInfo->DestRect.right; i++)
        {
          xColor = XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, *SourceLine_16BPP);
          *DestLine++ = xColor & 0xff;
          *(PWORD)DestLine = xColor >> 8;
          DestLine += 2;
          SourceLine_16BPP++;
        }

        SourceBits_16BPP = (PWORD)((PBYTE)SourceBits_16BPP + BltInfo->SourceSurface->lDelta);
        DestBits += BltInfo->DestSurface->lDelta;
      }
      break;

    case BMF_24BPP:
      if (NULL == BltInfo->XlateSourceToDest || 0 != (BltInfo->XlateSourceToDest->flXlate & XO_TRIVIAL))
      {
	if (BltInfo->DestRect.top < BltInfo->SourcePoint.y)
	  {
	    SourceBits = (PBYTE)BltInfo->SourceSurface->pvScan0 + (BltInfo->SourcePoint.y * BltInfo->SourceSurface->lDelta) + 3 * BltInfo->SourcePoint.x;
	    for (j = BltInfo->DestRect.top; j < BltInfo->DestRect.bottom; j++)
	      {
		RtlMoveMemory(DestBits, SourceBits, 3 * (BltInfo->DestRect.right - BltInfo->DestRect.left));
		SourceBits += BltInfo->SourceSurface->lDelta;
		DestBits += BltInfo->DestSurface->lDelta;
	      }
	  }
	else
	  {
	    SourceBits = (PBYTE)BltInfo->SourceSurface->pvScan0 + ((BltInfo->SourcePoint.y + BltInfo->DestRect.bottom - BltInfo->DestRect.top - 1) * BltInfo->SourceSurface->lDelta) + 3 * BltInfo->SourcePoint.x;
	    DestBits = (PBYTE)BltInfo->DestSurface->pvScan0 + ((BltInfo->DestRect.bottom - 1) * BltInfo->DestSurface->lDelta) + 3 * BltInfo->DestRect.left;
	    for (j = BltInfo->DestRect.bottom - 1; BltInfo->DestRect.top <= j; j--)
	      {
		RtlMoveMemory(DestBits, SourceBits, 3 * (BltInfo->DestRect.right - BltInfo->DestRect.left));
		SourceBits -= BltInfo->SourceSurface->lDelta;
		DestBits -= BltInfo->DestSurface->lDelta;
	      }
	  }
      }
      else
      {
        sx = BltInfo->SourcePoint.x;
        sy = BltInfo->SourcePoint.y;

      for (j=BltInfo->DestRect.top; j<BltInfo->DestRect.bottom; j++)
      {
        sx = BltInfo->SourcePoint.x;
        for (i=BltInfo->DestRect.left; i<BltInfo->DestRect.right; i++)
        {
           DWORD pixel = DIB_24BPP_GetPixel(BltInfo->SourceSurface, sx, sy);
           DIB_24BPP_PutPixel(BltInfo->DestSurface, i, j, XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, pixel));
          sx++;
        }
        sy++;
      }
      }
      break;

    case BMF_32BPP:
      SourceLine = (PBYTE)BltInfo->SourceSurface->pvScan0 + (BltInfo->SourcePoint.y * BltInfo->SourceSurface->lDelta) + 4 * BltInfo->SourcePoint.x;
      DestLine = DestBits;

      for (j = BltInfo->DestRect.top; j < BltInfo->DestRect.bottom; j++)
      {
        SourceBits = SourceLine;
        DestBits = DestLine;

        for (i = BltInfo->DestRect.left; i < BltInfo->DestRect.right; i++)
        {
          xColor = XLATEOBJ_iXlate(BltInfo->XlateSourceToDest, *((PDWORD) SourceBits));
          *DestBits = xColor & 0xff;
          *(PWORD)(DestBits + 1) = xColor >> 8;
          SourceBits += 4;
	  DestBits += 3;
        }

        SourceLine += BltInfo->SourceSurface->lDelta;
        DestLine += BltInfo->DestSurface->lDelta;
      }
      break;

    default:
      DbgPrint("DIB_24BPP_Bitblt: Unhandled Source BPP: %u\n", BitsPerFormat(BltInfo->SourceSurface->iBitmapFormat));
      return FALSE;
  }

  return TRUE;
}

BOOLEAN
DIB_24BPP_BitBlt(PBLTINFO BltInfo)
{
   ULONG DestX, DestY;
   ULONG SourceX, SourceY;
   ULONG PatternY = 0;
   ULONG Dest, Source = 0, Pattern = 0;
   BOOL UsesSource;
   BOOL UsesPattern;
   PBYTE DestBits;

   UsesSource = ROP4_USES_SOURCE(BltInfo->Rop4);
   UsesPattern = ROP4_USES_PATTERN(BltInfo->Rop4);

   SourceY = BltInfo->SourcePoint.y;
   DestBits = (PBYTE)(
      (PBYTE)BltInfo->DestSurface->pvScan0 +
      (BltInfo->DestRect.left << 1) + BltInfo->DestRect.left +
      BltInfo->DestRect.top * BltInfo->DestSurface->lDelta);

   if (UsesPattern)
   {
      if (BltInfo->PatternSurface)
      {
         PatternY = (BltInfo->DestRect.top + BltInfo->BrushOrigin.y) %
                    BltInfo->PatternSurface->sizlBitmap.cy;
      }
      else
      {
         Pattern = BltInfo->Brush->iSolidColor;
      }
   }

   for (DestY = BltInfo->DestRect.top; DestY < BltInfo->DestRect.bottom; DestY++)
   {
      SourceX = BltInfo->SourcePoint.x;

      for (DestX = BltInfo->DestRect.left; DestX < BltInfo->DestRect.right; DestX++, DestBits += 3, SourceX++)
      {
         Dest = *((PUSHORT)DestBits) + (*(DestBits + 2) << 16);

         if (UsesSource)
         {
            Source = DIB_GetSource(BltInfo->SourceSurface, SourceX, SourceY, BltInfo->XlateSourceToDest);
         }

         if (BltInfo->PatternSurface)
	 {
            Pattern = DIB_GetSource(BltInfo->PatternSurface, (DestX + BltInfo->BrushOrigin.x) % BltInfo->PatternSurface->sizlBitmap.cx, PatternY, BltInfo->XlatePatternToDest);
         }

         Dest = DIB_DoRop(BltInfo->Rop4, Dest, Source, Pattern) & 0xFFFFFF;
         *(PUSHORT)(DestBits) = Dest & 0xFFFF;
         *(DestBits + 2) = Dest >> 16;
      }

      SourceY++;
      if (BltInfo->PatternSurface)
      {
         PatternY++;
         PatternY %= BltInfo->PatternSurface->sizlBitmap.cy;
      }
      DestBits -= (BltInfo->DestRect.right - BltInfo->DestRect.left) * 3;
      DestBits += BltInfo->DestSurface->lDelta;
   }

   return TRUE;
}

/* BitBlt Optimize */
BOOLEAN
DIB_24BPP_ColorFill(SURFOBJ* DestSurface, RECTL* DestRect, ULONG color)
{
  ULONG DestY;

#if defined(_M_IX86) && !defined(_MSC_VER)
  PBYTE xaddr = (PBYTE)DestSurface->pvScan0 + DestRect->top * DestSurface->lDelta + (DestRect->left << 1) + DestRect->left;
  PBYTE addr;
  ULONG Count;
  ULONG xCount=DestRect->right - DestRect->left;

  for (DestY = DestRect->top; DestY< DestRect->bottom; DestY++)
  {
    Count = xCount;
    addr = xaddr;
    xaddr = (PBYTE)((ULONG_PTR)addr + DestSurface->lDelta);

    if (Count < 8)
    {
      /* For small fills, don't bother doing anything fancy */
      while (Count--)
        {
          *(PUSHORT)(addr) = color;
          addr += 2;
          *(addr) = color >> 16;
          addr += 1;
        }
    }
  else
    {
      /* Align to 4-byte address */
      while (0 != ((ULONG_PTR) addr & 0x3))
        {
          *(PUSHORT)(addr) = color;
          addr += 2;
          *(addr) = color >> 16;
          addr += 1;
          Count--;
        }
      /* If the color we need to fill with is 0ABC, then the final mem pattern
       * (note little-endianness) would be:
       *
       * |C.B.A|C.B.A|C.B.A|C.B.A|   <- pixel borders
       * |C.B.A.C|B.A.C.B|A.C.B.A|   <- ULONG borders
       *
       * So, taking endianness into account again, we need to fill with these
       * ULONGs: CABC BCAB ABCA */

       /* This is about 30% faster than the generic C code below */
       __asm__ __volatile__ (
"      movl %1, %%ecx\n"
"      andl $0xffffff, %%ecx\n"         /* 0ABC */
"      movl %%ecx, %%ebx\n"             /* Construct BCAB in ebx */
"      shrl $8, %%ebx\n"
"      movl %%ecx, %%eax\n"
"      shll $16, %%eax\n"
"      orl  %%eax, %%ebx\n"
"      movl %%ecx, %%edx\n"             /* Construct ABCA in edx */
"      shll $8, %%edx\n"
"      movl %%ecx, %%eax\n"
"      shrl $16, %%eax\n"
"      orl  %%eax, %%edx\n"
"      movl %%ecx, %%eax\n"             /* Construct CABC in eax */
"      shll $24, %%eax\n"
"      orl  %%ecx, %%eax\n"
"      movl %2, %%ecx\n"                /* Load count */
"      shr  $2, %%ecx\n"
"      movl %3, %%edi\n"                /* Load dest */
".FL1:\n"
"      movl %%eax, (%%edi)\n"           /* Store 4 pixels, 12 bytes */
"      movl %%ebx, 4(%%edi)\n"
"      movl %%edx, 8(%%edi)\n"
"      addl $12, %%edi\n"
"      dec  %%ecx\n"
"      jnz  .FL1\n"
"      movl %%edi, %0\n"
  : "=m"(addr)
  : "m"(color), "m"(Count), "m"(addr)
  : "%eax", "%ebx", "%ecx", "%edx", "%edi");
   Count = Count & 0x03;
      while (0 != Count--)
        {
          *(PUSHORT)(addr) = color;
          addr += 2;
          *(addr) = color >> 16;
          addr += 1;
        }
    }
  }
#else

  for (DestY = DestRect->top; DestY< DestRect->bottom; DestY++)
    {
      DIB_24BPP_HLine(DestSurface, DestRect->left, DestRect->right, DestY, color);
    }
#endif
  return TRUE;
}

//NOTE: If you change something here, please do the same in other dibXXbpp.c files!
BOOLEAN DIB_24BPP_StretchBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
                            RECTL* DestRect, RECTL *SourceRect,
                            POINTL* MaskOrigin, POINTL BrushOrigin,
                            CLIPOBJ *ClipRegion, XLATEOBJ *ColorTranslation,
                            ULONG Mode)
{
   LONG SrcSizeY;
   LONG SrcSizeX;
   LONG DesSizeY;
   LONG DesSizeX;
   LONG sx;
   LONG sy;
   LONG DesX;
   LONG DesY;
   LONG color;

   SrcSizeY = SourceRect->bottom - SourceRect->top;
   SrcSizeX = SourceRect->right - SourceRect->left;

   DesSizeY = DestRect->bottom - DestRect->top;
   DesSizeX = DestRect->right - DestRect->left;

   switch(SourceSurf->iBitmapFormat)
   {
      case BMF_1BPP:
	  /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                  sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;

                  if(DIB_1BPP_GetPixel(SourceSurf, sx, sy) == 0)
				  {
					DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, 0));
                  }
				  else
				  {
                    DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, 1));
                  }
            }
       }

	  break;

      case BMF_4BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                 sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;
                 color = DIB_4BPP_GetPixel(SourceSurf, sx, sy);
                 DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, color));
            }
       }
      break;

      case BMF_8BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                 sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;
                 color = DIB_8BPP_GetPixel(SourceSurf, sx, sy);
                 DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, color));
            }
       }
      break;

      case BMF_16BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                 sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;
                 color = DIB_16BPP_GetPixel(SourceSurf, sx, sy);
                 DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, color));
            }
       }
      break;

      case BMF_24BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                 sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;
                 color = DIB_24BPP_GetPixel(SourceSurf, sx, sy);
                 DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, color));
            }
       }
      break;

      case BMF_32BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */

       for (DesY=DestRect->top; DesY<DestRect->bottom; DesY++)
       {
           sy = (((DesY - DestRect->top) * SrcSizeY) / DesSizeY) + SourceRect->top;

            for (DesX=DestRect->left; DesX<DestRect->right; DesX++)
            {
                 sx = (((DesX - DestRect->left) * SrcSizeX) / DesSizeX) + SourceRect->left;
                 color = DIB_32BPP_GetPixel(SourceSurf, sx, sy);
                 DIB_24BPP_PutPixel(DestSurf, DesX, DesY, XLATEOBJ_iXlate(ColorTranslation, color));
            }
       }
      break;

      default:
      //DPRINT1("DIB_24BPP_StretchBlt: Unhandled Source BPP: %u\n", BitsPerFormat(SourceSurf->iBitmapFormat));
      return FALSE;
    }

  return TRUE;
}

BOOLEAN
DIB_24BPP_TransparentBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
                         RECTL*  DestRect,  POINTL  *SourcePoint,
                         XLATEOBJ *ColorTranslation, ULONG iTransColor)
{
  ULONG X, Y, SourceX, SourceY, Source, wd, Dest;
  BYTE *DestBits;

  SourceY = SourcePoint->y;
  DestBits = (BYTE*)((PBYTE)DestSurf->pvScan0 +
                      (DestRect->left << 2) +
                      DestRect->top * DestSurf->lDelta);
  wd = DestSurf->lDelta - ((DestRect->right - DestRect->left) << 2);

  for(Y = DestRect->top; Y < DestRect->bottom; Y++)
  {
    SourceX = SourcePoint->x;
    for(X = DestRect->left; X < DestRect->right; X++, DestBits += 3, SourceX++)
    {
      Source = DIB_GetSourceIndex(SourceSurf, SourceX, SourceY);
      if(Source != iTransColor)
      {
        Dest = XLATEOBJ_iXlate(ColorTranslation, Source) & 0xFFFFFF;
         *(PUSHORT)(DestBits) = Dest & 0xFFFF;
         *(DestBits + 2) = Dest >> 16;
      }
    }

    SourceY++;
    DestBits = (BYTE*)((ULONG_PTR)DestBits + wd);
  }

  return TRUE;
}

typedef union {
   ULONG ul;
   struct {
      UCHAR red;
      UCHAR green;
      UCHAR blue;
      UCHAR alpha;
   } col;
} NICEPIXEL32;

static __inline UCHAR
Clamp8(ULONG val)
{
   return (val > 255) ? 255 : val;
}

BOOLEAN
DIB_24BPP_AlphaBlend(SURFOBJ* Dest, SURFOBJ* Source, RECTL* DestRect,
                     RECTL* SourceRect, CLIPOBJ* ClipRegion,
                     XLATEOBJ* ColorTranslation, BLENDOBJ* BlendObj)
{
   INT Rows, Cols, SrcX, SrcY;
   register PUCHAR Dst;
   ULONG DstDelta;
   BLENDFUNCTION BlendFunc;
   register NICEPIXEL32 DstPixel, SrcPixel;
   UCHAR Alpha, SrcBpp;

   DPRINT("DIB_24BPP_AlphaBlend: srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
          SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom,
          DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);

   ASSERT(DestRect->bottom - DestRect->top == SourceRect->bottom - SourceRect->top &&
          DestRect->right - DestRect->left == SourceRect->right - SourceRect->left);

   BlendFunc = BlendObj->BlendFunction;
   if (BlendFunc.BlendOp != AC_SRC_OVER)
   {
      DPRINT1("BlendOp != AC_SRC_OVER\n");
      return FALSE;
   }
   if (BlendFunc.BlendFlags != 0)
   {
      DPRINT1("BlendFlags != 0\n");
      return FALSE;
   }
   if ((BlendFunc.AlphaFormat & ~AC_SRC_ALPHA) != 0)
   {
      DPRINT1("Unsupported AlphaFormat (0x%x)\n", BlendFunc.AlphaFormat);
      return FALSE;
   }
   if ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0 &&
       BitsPerFormat(Source->iBitmapFormat) != 32)
   {
      DPRINT1("Source bitmap must be 32bpp when AC_SRC_ALPHA is set\n");
      return FALSE;
   }

   Dst = (PUCHAR)((ULONG_PTR)Dest->pvScan0 + (DestRect->top * Dest->lDelta) +
                             (DestRect->left * 3));
   DstDelta = Dest->lDelta - ((DestRect->right - DestRect->left) * 3);
   SrcBpp = BitsPerFormat(Source->iBitmapFormat);

   Rows = DestRect->bottom - DestRect->top;
   SrcY = SourceRect->top;
   while (--Rows >= 0)
   {
      Cols = DestRect->right - DestRect->left;
      SrcX = SourceRect->left;
      while (--Cols >= 0)
      {
         SrcPixel.ul = DIB_GetSource(Source, SrcX++, SrcY, ColorTranslation);
         SrcPixel.col.red = SrcPixel.col.red * BlendFunc.SourceConstantAlpha / 255;
         SrcPixel.col.green = SrcPixel.col.green * BlendFunc.SourceConstantAlpha / 255;
         SrcPixel.col.blue = SrcPixel.col.blue * BlendFunc.SourceConstantAlpha / 255;
         SrcPixel.col.alpha = (SrcBpp == 32) ? (SrcPixel.col.alpha * BlendFunc.SourceConstantAlpha / 255) : BlendFunc.SourceConstantAlpha;

         Alpha = ((BlendFunc.AlphaFormat & AC_SRC_ALPHA) != 0) ?
                 SrcPixel.col.alpha : BlendFunc.SourceConstantAlpha;

         DstPixel.ul = *Dst;
         DstPixel.col.red = Clamp8(DstPixel.col.red * (255 - Alpha) / 255 + SrcPixel.col.red);
         DstPixel.col.green = Clamp8(DstPixel.col.green * (255 - Alpha) / 255 + SrcPixel.col.green);
         DstPixel.col.blue = Clamp8(DstPixel.col.blue * (255 - Alpha) / 255 + SrcPixel.col.blue);
         *Dst = DstPixel.ul;
         Dst = (PUCHAR)((ULONG_PTR)Dst + 3);
      }
      Dst = (PUCHAR)((ULONG_PTR)Dst + DstDelta);
      SrcY++;
   }

   return TRUE;
}

/* EOF */
