c++ - Creating an bitmap atlas with direct2d, what does "current bitmap" refer to? -

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so trying bitmaps atlas direct2d. method have maybe want but... current bitmap refer to? if understand well, doesn't copy , area bitmap bitmap right?

virtual hresult copyfrombitmap(   [in, optional]  const d2d1_point_2u *destpoint,   [in]            id2d1bitmap *bitmap,   [in, optional]  const d2d1_rect_u *srcrect ) = 0;

destpoint [in, optional]

type: const d2d1_point_2u*

in current bitmap, upper-left corner of area region specified srcrect copied.

bitmap [in]

type: id2d1bitmap*

the bitmap copy from.

srcrect [in, optional]

type: const d2d1_rect_u*

the area of bitmap copy

copyfrombitmap() method on id2d1bitmap interface, implies have bitmap already, object calls copy function. ...

id2d1bitmap *psourcebitmap = 0; id2d1bitmap *pdestinationbitmap = 0;  // initialisation of above bitmaps goes here ...  // copy region source destination pdestinationbitmap->copyfrombitmap(/*point want copy to*/, psourcebitmap,      /*rect copy from*/);

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