apps/tests/bitblt/bitblt.cpp

   1
   2 // ------------------------------------------------------------------
   3 // Windows 2000 Graphics API Black Book
   4 // Chapter 1 - Listing 1.3 (BitBlt Bitmap Rendering Demo)
   5 //
   6 // Created by Damon Chandler <dmc27@ee.cornell.edu>
   7 // Updates can be downloaded at: <www.coriolis.com>
   8 //
   9 // Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
  10 // if you have any questions about this code.
  11 // ------------------------------------------------------------------
  12
  13
  14 //>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
  15 #include <windows.h>
  16 //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
  17
  18
  19 HINSTANCE HInst;
  20 const char* WndClassName = "GMainWnd";
  21 LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
  22    LPARAM LParam);
  23
  24
  25 int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
  26     LPTSTR lpCmdLine, int nCmdShow)
  27 {
  28    HInst = HInstance;
  29
  30    WNDCLASS wc;
  31    memset(&wc, 0, sizeof(WNDCLASS));
  32
  33    wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
  34    wc.lpfnWndProc = MainWndProc;
  35    wc.hInstance = HInstance;
  36    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
  37    wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1);
  38    wc.lpszClassName = WndClassName;
  39
  40    if (RegisterClass(&wc))
  41    {
  42       HWND HWnd =
  43          CreateWindow(
  44             WndClassName, TEXT("BitBlt Bitmap Rendering Demo"),
  45             WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION |
  46             WS_VISIBLE | WS_CLIPSIBLINGS,
  47             0, 0, 220, 230,
  48             NULL, NULL, HInst, NULL
  49             );
  50
  51       if (HWnd)
  52       {
  53          ShowWindow(HWnd, nCmdShow);
  54          UpdateWindow(HWnd);
  55
  56          MSG msg;
  57          while (GetMessage(&msg, NULL, 0, 0))
  58          {
  59              TranslateMessage(&msg);
  60              DispatchMessage(&msg);
  61          }
  62       }
  63     }
  64     return 0;
  65 }
  66 //------------------------------------------------------------------
  67
  68
  69 // image related
  70 BITMAP bmp;
  71 LPCSTR filename = TEXT("lena.bmp");
  72 HDC HMemDC = NULL;
  73 HBITMAP HOldBmp = NULL;
  74
  75 LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
  76    LPARAM LParam)
  77 {
  78    switch (Msg)
  79    {
  80       case WM_CREATE:
  81       {
  82          // create a memory DC
  83          HMemDC = CreateCompatibleDC(NULL);
  84          if (HMemDC)
  85          {
  86             // load a bitmap from file
  87             HBITMAP HBmp =
  88                static_cast<HBITMAP>(
  89                   LoadImage(HInst, filename, IMAGE_BITMAP,
  90                             0, 0, LR_LOADFROMFILE)
  91                             );
  92             if (HBmp)
  93             {
  94                // extract dimensions of the bitmap
  95                GetObject(HBmp, sizeof(BITMAP), &bmp);
  96
  97                // associate the bitmap with the memory DC
  98                HOldBmp = static_cast<HBITMAP>(
  99                   SelectObject(HMemDC, HBmp)
 100                   );
 101             }
 102          }
 103       }
 104       case WM_PAINT:
 105       {
 106          PAINTSTRUCT ps;
 107          const HDC Hdc = BeginPaint(HWnd, &ps);
 108          try
 109          {
 110             //
 111             // TODO: add palette support (see Chapter 9)...
 112             //
 113
 114             BitBlt(Hdc, 20, 15,
 115                    bmp.bmWidth, bmp.bmHeight,
 116                    HMemDC, 0, 0,
 117                    SRCCOPY);
 118          }
 119          catch (...)
 120          {
 121             EndPaint(HWnd, &ps);
 122          }
 123          EndPaint(HWnd, &ps);
 124          break;
 125       }
 126       case WM_DESTROY:
 127       {
 128          // clean up
 129          DeleteObject(SelectObject(HMemDC, HOldBmp));
 130          DeleteDC(HMemDC);
 131
 132          PostQuitMessage(0);
 133          return 0;
 134       }
 135    }
 136    return DefWindowProc(HWnd, Msg, WParam, LParam);
 137 }
 138 //------------------------------------------------------------------