0.0与0 有区别呢???
graphics.DrawImage(m_pImage, 0.0, 0.0, BKRect.Width(), BKRect.Height());

[解决办法]
浮点数更精确！
[解决办法]
你给的 是 int version
还有：
typedef float REAL;

// float version
Status DrawImage(IN Image* image,
IN REAL x,
IN REAL y,
IN REAL srcx,
IN REAL srcy,
IN REAL srcwidth,
IN REAL srcheight,
IN Unit srcUnit)