Showing same bitmap image nxt to eachother on single window

Question

I have a window, based on user input I have to show the same bitmap next to each other on the same window. Suppose say user gives 1 as input.So I have to display the image only once such tht it covers complete window If user gives 2 as input then I have to display same image nxt to each other on the same window.So half of window will be loaded with image and next half with same image again.

Here is what I tried

RECT rect;
HDC hDC = GetDC(hwnd);
hMemDC = CreateCompatibleDC(hDC);
::SelectObject(hMemDC, bmp);
GetClientRect(hwnd, &rect);
SetStretchBltMode(hDC,HALFTONE);
// when input is one
StretchBlt(hDC, rect.left, rect.top, rect.right, rect.bottom, hMemDC, 0,
    0,bmpdata.bmWidth, bmpdata.bmHeight,SRCCOPY);

// when input is 2 I use StretchBlt twice
StretchBlt(hDC, rect.left, rect.top, rect.right/2-1, rect.bottom/2-1, hMemDC, 0,
    0,bmpdata.bmWidth, bmpdata.bmHeight,SRCCOPY);
StretchBlt(hDC, rect.right/2,  rect.bottom/2, rect.right, rect.bottom, hMemDC, 0,
    0,bmpdata.bmWidth, bmpdata.bmHeight,SRCCOPY);

It displays only half the screen. Second Stretchblt doesn't have any affect