bitblt.c File Reference

#include <windows.h>
#include <string.h>

Include dependency graph for bitblt.c:

Go to the source code of this file.

Functions
LRESULT CALLBACK	MainWndProc (HWND HWnd, UINT Msg, WPARAM WParam, LPARAM LParam)
int APIENTRY	WinMain (HINSTANCE HInstance, HINSTANCE HPrevInstance, LPTSTR lpCmdLine, int nCmdShow)

Variables
HINSTANCE	HInst
const char *	WndClassName = "GMainWnd"
BITMAP	bmp
LPCSTR	filename = TEXT("lena.bmp")
HDC	HMemDC = NULL
HBITMAP	HOldBmp = NULL

Function Documentation

MainWndProc()

LRESULT CALLBACK MainWndProc	(	HWND	HWnd,
		UINT	Msg,
		WPARAM	WParam,
		LPARAM	LParam
	)

Definition at line 73 of file bitblt.c.

{
   switch (Msg)
   {
      case WM_CREATE:
      {
         /* create a memory DC */
         HMemDC = CreateCompatibleDC(NULL);
         if (HMemDC)
         {
            /* load a bitmap from file */
            HBITMAP HBmp =
               /* static_cast<HBITMAP> */(
                  LoadImage(HInst, MAKEINTRESOURCE(1000), IMAGE_BITMAP,
                            0, 0, 0)
                            );
            if (HBmp)
            {
               /* extract dimensions of the bitmap */
               GetObject(HBmp, sizeof(BITMAP), &bmp);
 
               /* associate the bitmap with the memory DC */
               /* HOldBmp = static_cast<HBITMAP> */
        (SelectObject(HMemDC, HBmp)
                  );
            }
         }
      }
      case WM_PAINT:
      {
         PAINTSTRUCT ps;
         const HDC Hdc = BeginPaint(HWnd, &ps);
#if 0
         try
#endif
         {
 
            /* TODO: add palette support (see Chapter 9)... */
 
 
            BitBlt(Hdc, 20, 15,
                   bmp.bmWidth, bmp.bmHeight,
                   HMemDC, 0, 0,
                   SRCCOPY);
         }
#if 0
         catch (...)
#endif
         {
            EndPaint(HWnd, &ps);
         }
         EndPaint(HWnd, &ps);
         break;
      }
      case WM_DESTROY:
      {
         /* clean up */
         DeleteObject(SelectObject(HMemDC, HOldBmp));
         DeleteDC(HMemDC);
 
         PostQuitMessage(0);
         return 0;
      }
   }
   return DefWindowProc(HWnd, Msg, WParam, LParam);
}

Referenced by WinMain().

WinMain()

int APIENTRY WinMain	(	HINSTANCE	HInstance,
		HINSTANCE	HPrevInstance,
		LPTSTR	lpCmdLine,
		int	nCmdShow
	)

Definition at line 23 of file bitblt.c.

{
   WNDCLASS wc;
   MSG msg;
 
   HInst = HInstance;
 
   memset(&wc, 0, sizeof(WNDCLASS));
 
   wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
   wc.lpfnWndProc = MainWndProc;
   wc.hInstance = HInstance;
   wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
  /* wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1); */
   wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
   wc.lpszClassName = WndClassName;
 
   if (RegisterClass(&wc))
   {
      HWND HWnd =
         CreateWindow(
            WndClassName, TEXT("BitBlt Bitmap Rendering Demo"),
            WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION |
            WS_VISIBLE | WS_CLIPSIBLINGS,
            0, 0, 220, 230,
            NULL, NULL, HInst, NULL
            );
 
      if (HWnd)
      {
         ShowWindow(HWnd, nCmdShow);
         UpdateWindow(HWnd);
 
         while (GetMessage(&msg, NULL, 0, 0))
         {
             TranslateMessage(&msg);
             DispatchMessage(&msg);
         }
      }
    }
    return 0;
}

Variable Documentation

bmp

BITMAP bmp

Definition at line 68 of file bitblt.c.

Referenced by MainWndProc().

filename

LPCSTR filename = TEXT("lena.bmp")

Definition at line 69 of file bitblt.c.

HInst

HINSTANCE HInst

Definition at line 17 of file bitblt.c.

Referenced by MainWndProc(), and WinMain().

HMemDC

HDC HMemDC = NULL

Definition at line 70 of file bitblt.c.

Referenced by MainWndProc().

HOldBmp

HBITMAP HOldBmp = NULL

Definition at line 71 of file bitblt.c.

Referenced by MainWndProc().

WndClassName

const char* WndClassName = "GMainWnd"

Definition at line 18 of file bitblt.c.

Referenced by WinMain().