Thread: Copy region of bitmap to region of rectangle

I want to take part of a bitmap and copy it onto part of a rectangle. For example, take the region from (10,10) to (20,20) of the bitmap and copy it to the region from (35,35) to (45,45) of a rectangle. So far all of the functions I've seen only allow you to specify where on the destination rectangle to copy to, but not from the source bitmap.

BitBlt will do that for you - there are several different variations of Blt, but this is the specification for the standard variant:

Code:

BOOL BitBlt(
  HDC hdcDest, // handle to destination DC
  int nXDest,  // x-coord of destination upper-left corner
  int nYDest,  // y-coord of destination upper-left corner
  int nWidth,  // width of destination rectangle
  int nHeight, // height of destination rectangle
  HDC hdcSrc,  // handle to source DC
  int nXSrc,   // x-coordinate of source upper-left corner
  int nYSrc,   // y-coordinate of source upper-left corner
  DWORD dwRop  // raster operation code
);

As you can see, it has the source and destination coordinates (since it's a fixed size Blt, you only need to specify height and width once of course).

--
Mats

That did it; thanks.