비트 블릿 (BitBlt)

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
HWND hWndMain;
LPSTR lpszClass="BitBlt";

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
     ,LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    
    WndClass.cbClsExtra=0;
    WndClass.cbWndExtra=0;
    WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
    WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    WndClass.hInstance=hInstance;
    WndClass.lpfnWndProc=(WNDPROC)WndProc;
    WndClass.lpszClassName=lpszClass;
    WndClass.lpszMenuName=NULL;
    WndClass.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&WndClass);

    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
        NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);
    hWndMain=hWnd;
    
    while(GetMessage(&Message,0,0,0)) {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    return Message.wParam;
}

void DrawBitmap(HDC hdc,int x,int y,HBITMAP hBit)
{
    HDC MemDC;
    HBITMAP OldBitmap;
    int bx,by;
    BITMAP bit;

    MemDC=CreateCompatibleDC(hdc);
    OldBitmap=(HBITMAP)SelectObject(MemDC, hBit);

    GetObject(hBit,sizeof(BITMAP),&bit);
    bx=bit.bmWidth;
    by=bit.bmHeight;

    BitBlt(hdc,0,0,bx,by,MemDC,0,0,SRCCOPY);

    SelectObject(MemDC,OldBitmap);
    DeleteDC(MemDC);
}

#include "resource.h"
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    HDC MemDC;
    HBITMAP MyBitmap, OldBitmap;
    int bx,by;
    BITMAP bit;

    switch(iMessage) {

    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        MemDC=CreateCompatibleDC(hdc);
        MyBitmap=LoadBitmap(g_hInst, MAKEINTRESOURCE(IDB_BITMAP1));
        OldBitmap=(HBITMAP)SelectObject(MemDC, MyBitmap);

        GetObject(MyBitmap,sizeof(BITMAP),&bit);
        bx=bit.bmWidth;
        by=bit.bmHeight;

        // 전체 출력
        //BitBlt(hdc,0,0,bx,by,MemDC,0,0,SRCCOPY);

        // 절반만 출력
        //BitBlt(hdc,0,0,bx/2,by/2,MemDC,0,by/2,SRCCOPY);

        // 같은 DC끼리 비트맵 전송
        BitBlt(hdc,0,0,bx,by,MemDC,0,0,SRCCOPY);
        BitBlt(hdc,0,by+10,bx,by/2,hdc,0,by/2,SRCCOPY);

        SelectObject(MemDC,OldBitmap);
        DeleteObject(MyBitmap);
        DeleteDC(MemDC);
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}