About GDI
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q126575&
中:
if (!StretchDIBits(hdc,
XDest, YDest + (int)floor(fDestYDelta * (nSrcHeight - (i+1))),
nDestWidth, (int)ceil(fDestYDelta),
XSrc, 0,
nSrcWidth, 1,
lpNewBits, lpBitsInfo,
iUsage, SRCCOPY))
break; // Error!
floor & ceil 是TMD 什么东西 ??