dib24bpp.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

          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 */