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{
        if (mNoLock)
                return;

        // Special path that avoids generating cached native alpha data 
        
        LPDIRECTDRAWSURFACE aSurface = GetSurface();

        if (!LockSurface())
                return;
                                
        if (mLockedSurfaceDesc.ddpfPixelFormat.dwRGBBitCount == 16)
        {
                ushort* aDestPixelsRow = ((ushort*) mLockedSurfaceDesc.lpSurface) + (theY * mLockedSurfaceDesc.lPitch/2) + theX;                
                SRC_TYPE* aSrcPixelsRow = aSrcBits + 
                        (theSrcRect.mY * theImage->mWidth) + theSrcRect.mX;                             

                ulong aRMask = mLockedSurfaceDesc.ddpfPixelFormat.dwRBitMask;
                ulong aGMask = mLockedSurfaceDesc.ddpfPixelFormat.dwGBitMask;
                ulong aBMask = mLockedSurfaceDesc.ddpfPixelFormat.dwBBitMask;

                ulong aRRoundAdd = aRMask >> 1;
                ulong aGRoundAdd = aGMask >> 1;
                ulong aBRoundAdd = aBMask >> 1;

#ifdef OPTIMIZE_SOFTWARE_DRAWING
                bool performNormalBlit = true;
                if (gOptimizeSoftwareDrawing) // we know the ordering of the bit masks.
                {
                        if (aGMask == 0x7E0)
                        {
                                performNormalBlit = false;
                                for (int y = 0; y < theSrcRect.mHeight; y++)
                                {
                                        ushort* aDestPixels = aDestPixelsRow;
                                        SRC_TYPE* aSrcPixels = aSrcPixelsRow;                                   

                                        for (int x = 0; x < theSrcRect.mWidth; x++)
                                        {
                                                ulong src = NEXT_SRC_COLOR;
                                                ulong dest = *aDestPixels;

                                                int a = src >> 27;
                                                //int oma = 256 - a;

                                                src = ((src & 0xFC00) << 11) + ((src >> 8) & 0xF800) + ((src >> 3) & 0x1F);
                                                dest = (dest | (dest << 16)) & 0x7E0F81F;
                                                dest += ((src - dest) * a) >> 5;
                                                dest &= 0x7E0F81F;
                                                *(aDestPixels++) = dest | (dest >> 16);
                                                        //(((((dest & aBMask) * oma) + (((src & 0x000000FF) * a * aBMask) >> 8) + aBRoundAdd) >> 8) & aBMask) +
                                                        //(((((dest & aGMask) * oma) + ((((src & 0x0000FF00) >> 8) * a * aGMask) >> 8) + aGRoundAdd) >> 8) & aGMask) +
                                                        //(((((dest & aRMask) * oma) + ((((src & 0x00FF0000) >> 16) * a * aRMask) >> 8) + aRRoundAdd) >> 8) & aRMask);
                                        }                               
                                        
                                        aDestPixelsRow += mLockedSurfaceDesc.lPitch/2;
                                        aSrcPixelsRow += theImage->mWidth;                                      
                                }
                        }
                        else if (aGMask == 0x3E0)
                        {
                                performNormalBlit = false;
                                for (int y = 0; y < theSrcRect.mHeight; y++)
                                {
                                        ushort* aDestPixels = aDestPixelsRow;
                                        SRC_TYPE* aSrcPixels = aSrcPixelsRow;                                   

                                        for (int x = 0; x < theSrcRect.mWidth; x++)
                                        {
                                                ulong src = NEXT_SRC_COLOR;
                                                ulong dest = *aDestPixels;

                                                int a = src >> 27;
                                                //int oma = 256 - a;

                                                src = ((src & 0xF800) << 10) + ((src >> 9) & 0x7C00) + ((src >> 3) & 0x1F);
                                                dest = (dest | (dest << 16)) & 0x3E07C1F;
                                                dest += ((src - dest) * a) >> 5;                // 1*d - a*d = (1-a)*d = oma*d :)
                                                dest &= 0x3E07C1F;
                                                *(aDestPixels++) = dest | (dest >> 16);
                                                        //(((((dest & aBMask) * oma) + (((src & 0x000000FF) * a * aBMask) >> 8) + aBRoundAdd) >> 8) & aBMask) +
                                                        //(((((dest & aGMask) * oma) + ((((src & 0x0000FF00) >> 8) * a * aGMask) >> 8) + aGRoundAdd) >> 8) & aGMask) +
                                                        //(((((dest & aRMask) * oma) + ((((src & 0x00FF0000) >> 16) * a * aRMask) >> 8) + aRRoundAdd) >> 8) & aRMask);
                                        }                               
                                        
                                        
                                        aDestPixelsRow += mLockedSurfaceDesc.lPitch/2;
                                        aSrcPixelsRow += theImage->mWidth;                                      
                                }
                        }
                }
                if (performNormalBlit)
#endif
                {       
                        for (int y = 0; y < theSrcRect.mHeight; y++)
                        {
                                ushort* aDestPixels = aDestPixelsRow;
                                SRC_TYPE* aSrcPixels = aSrcPixelsRow;                                   

                                for (int x = 0; x < theSrcRect.mWidth; x++)
                                {
                                        ulong src = NEXT_SRC_COLOR;
                                        ulong dest = *aDestPixels;

                                        int a = src >> 24;
                                        int oma = 256 - a;
                                        
                                        *(aDestPixels++) = 
                                                (((((dest & aBMask) * oma) + (((src & 0x000000FF) * a * aBMask) >> 8) + aBRoundAdd) >> 8) & aBMask) +
                                                (((((dest & aGMask) * oma) + ((((src & 0x0000FF00) >> 8) * a * aGMask) >> 8) + aGRoundAdd) >> 8) & aGMask) +
                                                (((((dest & aRMask) * oma) + ((((src & 0x00FF0000) >> 16) * a * aRMask) >> 8) + aRRoundAdd) >> 8) & aRMask);
                                }                               
                                
                                aDestPixelsRow += mLockedSurfaceDesc.lPitch/2;
                                aSrcPixelsRow += theImage->mWidth;                                      
                        }
                }
        }
        else if (mLockedSurfaceDesc.ddpfPixelFormat.dwRGBBitCount == 32)
        {
                ulong* aDestPixelsRow = ((ulong*) mLockedSurfaceDesc.lpSurface) + (theY * mLockedSurfaceDesc.lPitch/4) + theX;          
                SRC_TYPE* aSrcPixelsRow = aSrcBits + 
                        (theSrcRect.mY * theImage->mWidth) + theSrcRect.mX;                             

                ulong aRMask = mLockedSurfaceDesc.ddpfPixelFormat.dwRBitMask;
                ulong aGMask = mLockedSurfaceDesc.ddpfPixelFormat.dwGBitMask;
                ulong aBMask = mLockedSurfaceDesc.ddpfPixelFormat.dwBBitMask;

                ulong aRRoundAdd = aRMask >> 1;
                ulong aGRoundAdd = aGMask >> 1;
                ulong aBRoundAdd = aBMask >> 1;

#ifdef OPTIMIZE_SOFTWARE_DRAWING
                if (gOptimizeSoftwareDrawing)
                {
                        for (int y = 0; y < theSrcRect.mHeight; y++)
                        {
                                ulong* aDestPixels = aDestPixelsRow;
                                SRC_TYPE* aSrcPixels = aSrcPixelsRow;                                   

                                for (int x = 0; x < theSrcRect.mWidth; x++)
                                {
                                        ulong src = NEXT_SRC_COLOR;
                                        ulong dest = *aDestPixels;

                                        int a = src >> 24;
                                        //int oma = 256 - a;
                                        ulong srctmp = src & 0xFF00FF;
                                        ulong desttmp = dest & 0xFF00FF;
                                        desttmp = (desttmp + (((srctmp - desttmp) * a) >> 8)) & 0xFF00FF;
                                        src &= 0x00FF00;
                                        dest &= 0x00FF00;
                                        dest = (dest + (((src - dest) * a) >> 8)) & 0x00FF00;
                                        
                                        *(aDestPixels++) = dest | desttmp;
                                                //(((((dest & aBMask) * oma) + ((((src & 0x000000FF) * a) >> 8) * aBMask) + aBRoundAdd) >> 8) & aBMask) +
                                                //(((((dest & aGMask) * oma) + (((((src & 0x0000FF00) >> 8) * a) >> 8) * aGMask) + aGRoundAdd) >> 8) & aGMask) +
                                                //(((((dest & aRMask) * oma) + (((((src & 0x00FF0000) >> 16) * a) >> 8) * aRMask) + aRRoundAdd) >> 8) & aRMask);
                                }                               
                                
                                aDestPixelsRow += mLockedSurfaceDesc.lPitch/4;
                                aSrcPixelsRow += theImage->mWidth;                                      
                        }
                }
                else
#endif
                {
                        for (int y = 0; y < theSrcRect.mHeight; y++)
                        {
                                ulong* aDestPixels = aDestPixelsRow;
                                SRC_TYPE* aSrcPixels = aSrcPixelsRow;                                   

                                for (int x = 0; x < theSrcRect.mWidth; x++)
                                {
                                        ulong src = NEXT_SRC_COLOR;
                                        ulong dest = *aDestPixels;

                                        int a = src >> 24;
                                        int oma = 256 - a;
                                        
                                        *(aDestPixels++) = 
                                                (((((dest & aBMask) * oma) + ((((src & 0x000000FF) * a) >> 8) * aBMask) + aBRoundAdd) >> 8) & aBMask) +
                                                (((((dest & aGMask) * oma) + (((((src & 0x0000FF00) >> 8) * a) >> 8) * aGMask) + aGRoundAdd) >> 8) & aGMask) +
                                                (((((dest & aRMask) * oma) + (((((src & 0x00FF0000) >> 16) * a) >> 8) * aRMask) + aRRoundAdd) >> 8) & aRMask);
                                }                               
                                
                                aDestPixelsRow += mLockedSurfaceDesc.lPitch/4;
                                aSrcPixelsRow += theImage->mWidth;                                      
                        }
                }
        }

        UnlockSurface();
}