dib32bpp.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

    if (! FinalCopy32(Target, ScanLine, ClipSpans, ClipSpansCount, &SpanIndex, DestY, DestRect))
      {
        /* No more spans, everything else is clipped away, we're done */
        ExFreePool(ClipSpans);
        ExFreePool(ScanLine);
        ExFreePool(ScanLineAhead);
        return TRUE;
      }
    DestY++;
    Target = (PIXEL *)((BYTE *)Target + DestSurf->lDelta);
    Source += IntPart;
    E += FractPart;
    if (E >= DestRect->bottom - DestRect->top) {
      E -= DestRect->bottom - DestRect->top;
      Source = (PIXEL *)((BYTE *)Source + SourceSurf->lDelta);
    } /* if */
  } /* while */

  if (skip > 0 && Source != PrevSource)
    ScaleLineAvg32(ScanLine, Source, SourceRect->right - SourceRect->left, DestRect->right - DestRect->left);
  while (skip-- > 0) {
    if (! FinalCopy32(Target, ScanLine, ClipSpans, ClipSpansCount, &SpanIndex, DestY, DestRect))
      {
        /* No more spans, everything else is clipped away, we're done */
        ExFreePool(ClipSpans);
        ExFreePool(ScanLine);
        ExFreePool(ScanLineAhead);
        return TRUE;
      }
    DestY++;
    Target = (PIXEL *)((BYTE *)Target + DestSurf->lDelta);
  } /* while */

  ExFreePool(ClipSpans);
  ExFreePool(ScanLine);
  ExFreePool(ScanLineAhead);

  return TRUE;
}

//NOTE: If you change something here, please do the same in other dibXXbpp.c files!
BOOLEAN DIB_32BPP_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 = 0;
   LONG sy = 0;
   LONG DesX;
   LONG DesY;
   PULONG DestBits;
   LONG DifflDelta;

   LONG SrcZoomXHight;
   LONG SrcZoomXLow;
   LONG SrcZoomYHight;
   LONG SrcZoomYLow;

   LONG sy_dec = 0;
   LONG sy_max;

   LONG sx_dec = 0;
   LONG sx_max;

      
   DPRINT("DIB_32BPP_StretchBlt: Source BPP: %u, srcRect: (%d,%d)-(%d,%d), dstRect: (%d,%d)-(%d,%d)\n",
            BitsPerFormat(SourceSurf->iBitmapFormat), SourceRect->left, SourceRect->top, SourceRect->right, 
            SourceRect->bottom, DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);

    /* Calc the Zoom height of Source */
    SrcSizeY = SourceRect->bottom - SourceRect->top;

    /* Calc the Zoom Width of Source */
    SrcSizeX = SourceRect->right - SourceRect->left;
  
    /* Calc the Zoom height of Destions */
    DesSizeY = DestRect->bottom - DestRect->top;

    /* Calc the Zoom width of Destions */
    DesSizeX = DestRect->right - DestRect->left;

    /* Calc the zoom factor of soruce height */
    SrcZoomYHight = SrcSizeY / DesSizeY;
    SrcZoomYLow = SrcSizeY - (SrcZoomYHight * DesSizeY);

    /* Calc the zoom factor of soruce width */
    SrcZoomXHight = SrcSizeX / DesSizeX;
    SrcZoomXLow = SrcSizeX - (SrcZoomXHight * DesSizeX);

    sx_max = DesSizeX;
    sy_max = DesSizeY;
    sy = SourceRect->top;

    DestBits = (PULONG)((PBYTE)DestSurf->pvScan0 + (DestRect->left << 2) +
                               DestRect->top * DestSurf->lDelta);

    DifflDelta = DestSurf->lDelta -  (DesSizeX << 2); 

    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=0; DesY<DesSizeY; DesY++)
       {
            sx = SourceRect->left;
            sx_dec = 0;
            for (DesX=0; DesX<DesSizeX; DesX++)
            {
                *DestBits = XLATEOBJ_iXlate(ColorTranslation, 
                                            DIB_1BPP_GetPixel(SourceSurf, sx, sy));

                DestBits = (PULONG)((ULONG_PTR)DestBits + 4);

                sx += SrcZoomXHight;
                sx_dec += SrcZoomXLow;
                if (sx_dec >= sx_max)
                {
                    sx++;
                    sx_dec -= sx_max;
                }
            }

            DestBits = (PULONG)((ULONG_PTR)DestBits + DifflDelta);

            sy += SrcZoomYHight;
            sy_dec += SrcZoomYLow;
            if (sy_dec >= sy_max)
            {
                sy++;
                sy_dec -= sy_max;
            }
       }
       break;

      case BMF_4BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */
                      
       for (DesY=0; DesY<DesSizeY; DesY++)
       {
            sx = SourceRect->left;
            sx_dec = 0;
            for (DesX=0; DesX<DesSizeX; DesX++)
            {
                *DestBits = XLATEOBJ_iXlate(ColorTranslation, 
                                            DIB_4BPP_GetPixel(SourceSurf, sx, sy));

                DestBits = (PULONG)((ULONG_PTR)DestBits + 4);

                sx += SrcZoomXHight;
                sx_dec += SrcZoomXLow;
                if (sx_dec >= sx_max)
                {
                    sx++;
                    sx_dec -= sx_max;
                }
            }

            DestBits = (PULONG)((ULONG_PTR)DestBits + DifflDelta);

            sy += SrcZoomYHight;
            sy_dec += SrcZoomYLow;
            if (sy_dec >= sy_max)
            {
                sy++;
                sy_dec -= sy_max;
            }
       }
      break;

      case BMF_8BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */
      
       for (DesY=0; DesY<DesSizeY; DesY++)
       {
            sx = SourceRect->left;
            sx_dec = 0;
            for (DesX=0; DesX<DesSizeX; DesX++)
            {
                *DestBits = XLATEOBJ_iXlate(ColorTranslation, 
                                            DIB_8BPP_GetPixel(SourceSurf, sx, sy));

                DestBits = (PULONG)((ULONG_PTR)DestBits + 4);

                sx += SrcZoomXHight;
                sx_dec += SrcZoomXLow;
                if (sx_dec >= sx_max)
                {
                    sx++;
                    sx_dec -= sx_max;
                }
            }

            DestBits = (PULONG)((ULONG_PTR)DestBits + DifflDelta);

            sy += SrcZoomYHight;
            sy_dec += SrcZoomYLow;
            if (sy_dec >= sy_max)
            {
                sy++;
                sy_dec -= sy_max;
            }
       }
      break;

      case BMF_16BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */
                      
       for (DesY=0; DesY<DesSizeY; DesY++)
       {
            sx = SourceRect->left;
            sx_dec = 0;
            for (DesX=0; DesX<DesSizeX; DesX++)
            {
                *DestBits = XLATEOBJ_iXlate(ColorTranslation, 
                                            DIB_16BPP_GetPixel(SourceSurf, sx, sy));

                DestBits = (PULONG)((ULONG_PTR)DestBits + 4);

                sx += SrcZoomXHight;
                sx_dec += SrcZoomXLow;
                if (sx_dec >= sx_max)
                {
                    sx++;
                    sx_dec -= sx_max;
                }
            }

            DestBits = (PULONG)((ULONG_PTR)DestBits + DifflDelta);

            sy += SrcZoomYHight;
            sy_dec += SrcZoomYLow;
            if (sy_dec >= sy_max)
            {
                sy++;
                sy_dec -= sy_max;
            }
       }
       break;

      case BMF_24BPP:
      /* FIXME :  MaskOrigin, BrushOrigin, ClipRegion, Mode ? */
      /* This is a reference implementation, it hasn't been optimized for speed */
                      
       for (DesY=0; DesY<DesSizeY; DesY++)
       {
            sx = SourceRect->left;
            sx_dec = 0;
            for (DesX=0; DesX<DesSizeX; DesX++)
            {
                *DestBits = XLATEOBJ_iXlate(ColorTranslation, 
                                            DIB_24BPP_GetPixel(SourceSurf, sx, sy));

                DestBits = (PULONG)((ULONG_PTR)DestBits + 4);

                sx += SrcZoomXHight;
                sx_dec += SrcZoomXLow;
                if (sx_dec >= sx_max)
                {
                    sx++;
                    sx_dec -= sx_max;
                }
            }

            DestBits = (PULONG)((ULONG_PTR)DestBits + DifflDelta);

            sy += SrcZoomYHight;
            sy_dec += SrcZoomYLow;
            if (sy_dec >= sy_max)
            {
                sy++;
                sy_dec -= sy_max;
            }
       }
       break;

      case BMF_32BPP:
        return ScaleRectAvg32(DestSurf, SourceSurf, DestRect, SourceRect, MaskOrigin, BrushOrigin,
                              ClipRegion, ColorTranslation, Mode);
      break;

      default:
      //DPRINT1("DIB_32BPP_StretchBlt: Unhandled Source BPP: %u\n", BitsPerFormat(SourceSurf->iBitmapFormat));
      return FALSE;
    }



  return TRUE;
}

BOOLEAN
DIB_32BPP_TransparentBlt(SURFOBJ *DestSurf, SURFOBJ *SourceSurf,
                         RECTL*  DestRect,  POINTL  *SourcePoint,
                         XLATEOBJ *ColorTranslation, ULONG iTransColor)
{
  ULONG X, Y, SourceX, SourceY, Source, wd;
  ULONG *DestBits;

  SourceY = SourcePoint->y;
  DestBits = (ULONG*)((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++, SourceX++)
    {
      Source = DIB_GetSourceIndex(SourceSurf, SourceX, SourceY);
      if(Source != iTransColor)
      {
        *DestBits = XLATEOBJ_iXlate(ColorTranslation, Source);
      }
    }

    SourceY++;
    DestBits = (ULONG*)((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_32BPP_AlphaBlend(SURFOBJ* Dest, SURFOBJ* Source, RECTL* DestRect,
                     RECTL* SourceRect, CLIPOBJ* ClipRegion,
                     XLATEOBJ* ColorTranslation, BLENDOBJ* BlendObj)
{
   INT Rows, Cols, SrcX, SrcY;
   register PULONG Dst;
   ULONG DstDelta;
   BLENDFUNCTION BlendFunc;
   register NICEPIXEL32 DstPixel, SrcPixel;
   UCHAR Alpha, SrcBpp;

   DPRINT("DIB_32BPP_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 = (PULONG)((ULONG_PTR)Dest->pvScan0 + (DestRect->top * Dest->lDelta) +
                             (DestRect->left << 2));
   DstDelta = Dest->lDelta - ((DestRect->right - DestRect->left) << 2);
   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);
         DstPixel.col.alpha = Clamp8(DstPixel.col.alpha * (255 - Alpha) / 255 + SrcPixel.col.alpha);
         *Dst++ = DstPixel.ul;
      }
      Dst = (PULONG)((ULONG_PTR)Dst + DstDelta);
      SrcY++;
   }

   return TRUE;
}

/* EOF */