StretchDiBits function acting weird

I'm trying to use the StretchDIBits function to display a bitmap, but it doesn't work very well. The image is 256x256 big and everything thing is fine if I display the whole bitmap. But when I try to display only part of the image then the function displays a part of the image I didn't want to display.

The following code for example should display the Upper-left part of the image but instead I get the Bottom-left part.

Code:

---

    SetStretchBltMode(hdc, HALFTONE);

    RECT result = CreateRect(0,0, 128, 128);

    if (StretchDIBits(hdc,
      result.left, result.top,
      result.right - result.left, result.bottom - result.top,
      result.left, result.top,
      result.right - result.left, result.bottom - result.top,
      cData, &bitmapinfo,
      DIB_RGB_COLORS, SRCCOPY
    )) return true;
    else return false;

---

And if I try to get the Bottom-Right part I get the Upper-right part. I can't figure out why this happens. Any ideas?