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- /*-------------------------------------------
- BITMASK.C -- Bitmap Masking Demonstration
- (c) Charles Petzold, 1998
- -------------------------------------------*/
-
- #include <windows.h>
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName [] = TEXT ("BitMask") ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (LTGRAY_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("Bitmap Masking Demo"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static HBITMAP hBitmapImag, hBitmapMask ;
- static HINSTANCE hInstance ;
- static int cxClient, cyClient, cxBitmap, cyBitmap ;
- BITMAP bitmap ;
- HDC hdc, hdcMemImag, hdcMemMask ;
- int x, y ;
- PAINTSTRUCT ps ;
-
- switch (message)
- {
- case WM_CREATE:
- hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
-
- // Load the original image and get its size
-
- hBitmapImag = LoadBitmap (hInstance, TEXT ("Matthew")) ;
- GetObject (hBitmapImag, sizeof (BITMAP), &bitmap) ;
- cxBitmap = bitmap.bmWidth ;
- cyBitmap = bitmap.bmHeight ;
-
- // Select the original image into a memory DC
-
- hdcMemImag = CreateCompatibleDC (NULL) ;
- SelectObject (hdcMemImag, hBitmapImag) ;
-
- // Create the monochrome mask bitmap and memory DC
-
- hBitmapMask = CreateBitmap (cxBitmap, cyBitmap, 1, 1, NULL) ;
- hdcMemMask = CreateCompatibleDC (NULL) ;
- SelectObject (hdcMemMask, hBitmapMask) ;
-
- // Color the mask bitmap black with a white ellipse
-
- SelectObject (hdcMemMask, GetStockObject (BLACK_BRUSH)) ;
- Rectangle (hdcMemMask, 0, 0, cxBitmap, cyBitmap) ;
- SelectObject (hdcMemMask, GetStockObject (WHITE_BRUSH)) ;
- Ellipse (hdcMemMask, 0, 0, cxBitmap, cyBitmap) ;
-
- // Mask the original image
-
- BitBlt (hdcMemImag, 0, 0, cxBitmap, cyBitmap,
- hdcMemMask, 0, 0, SRCAND) ;
-
- DeleteDC (hdcMemImag) ;
- DeleteDC (hdcMemMask) ;
- return 0 ;
-
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- // Select bitmaps into memory DCs
-
- hdcMemImag = CreateCompatibleDC (hdc) ;
- SelectObject (hdcMemImag, hBitmapImag) ;
-
- hdcMemMask = CreateCompatibleDC (hdc) ;
- SelectObject (hdcMemMask, hBitmapMask) ;
-
- // Center image
-
- x = (cxClient - cxBitmap) / 2 ;
- y = (cyClient - cyBitmap) / 2 ;
-
- // Do the bitblts
-
- BitBlt (hdc, x, y, cxBitmap, cyBitmap, hdcMemMask, 0, 0, 0x220326) ;
- BitBlt (hdc, x, y, cxBitmap, cyBitmap, hdcMemImag, 0, 0, SRCPAINT) ;
-
- DeleteDC (hdcMemImag) ;
- DeleteDC (hdcMemMask) ;
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- DeleteObject (hBitmapImag) ;
- DeleteObject (hBitmapMask) ;
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-