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- /*-------------------------------------------------------
- SHOWDIB4.C -- Displays DIB with "all-purpose" palette
- (c) Charles Petzold, 1998
- -------------------------------------------------------*/
-
- #include <windows.h>
- #include "..\\ShowDib3\\PackeDib.h"
- #include "resource.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- TCHAR szAppName[] = TEXT ("ShowDib4") ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- 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 (WHITE_BRUSH) ;
- wndclass.lpszMenuName = szAppName ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("Show DIB #4: All-Purpose Palette"),
- 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 ;
- }
-
- /*------------------------------------------------------------------------
- CreateAllPurposePalette: Creates a palette suitable for a wide variety
- of images; the palette has 247 entries, but 15 of them are
- duplicates or match the standard 20 colors.
- ------------------------------------------------------------------------*/
-
- HPALETTE CreateAllPurposePalette (void)
- {
- HPALETTE hPalette ;
- int i, incr, R, G, B ;
- LOGPALETTE * plp ;
-
- plp = malloc (sizeof (LOGPALETTE) + 246 * sizeof (PALETTEENTRY)) ;
-
- plp->palVersion = 0x0300 ;
- plp->palNumEntries = 247 ;
-
- // The following loop calculates 31 gray shades, but 3 of them
- // will match the standard 20 colors
-
- for (i = 0, G = 0, incr = 8 ; G <= 0xFF ; i++, G += incr)
- {
- plp->palPalEntry[i].peRed = (BYTE) G ;
- plp->palPalEntry[i].peGreen = (BYTE) G ;
- plp->palPalEntry[i].peBlue = (BYTE) G ;
- plp->palPalEntry[i].peFlags = 0 ;
-
- incr = (incr == 9 ? 8 : 9) ;
- }
-
- // The following loop is responsible for 216 entries, but 8 of
- // them will match the standard 20 colors, and another
- // 4 of them will match the gray shades above.
-
- for (R = 0 ; R <= 0xFF ; R += 0x33)
- for (G = 0 ; G <= 0xFF ; G += 0x33)
- for (B = 0 ; B <= 0xFF ; B += 0x33)
- {
- plp->palPalEntry[i].peRed = (BYTE) R ;
- plp->palPalEntry[i].peGreen = (BYTE) G ;
- plp->palPalEntry[i].peBlue = (BYTE) B ;
- plp->palPalEntry[i].peFlags = 0 ;
-
- i++ ;
- }
- hPalette = CreatePalette (plp) ;
-
- free (plp) ;
- return hPalette ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static BITMAPINFO * pPackedDib ;
- static HPALETTE hPalette ;
- static int cxClient, cyClient ;
- static OPENFILENAME ofn ;
- static TCHAR szFileName [MAX_PATH], szTitleName [MAX_PATH] ;
- static TCHAR szFilter[] = TEXT ("Bitmap Files (*.BMP)\0*.bmp\0")
- TEXT ("All Files (*.*)\0*.*\0\0") ;
- HDC hdc ;
- PAINTSTRUCT ps ;
-
- switch (message)
- {
- case WM_CREATE:
- ofn.lStructSize = sizeof (OPENFILENAME) ;
- ofn.hwndOwner = hwnd ;
- ofn.hInstance = NULL ;
- ofn.lpstrFilter = szFilter ;
- ofn.lpstrCustomFilter = NULL ;
- ofn.nMaxCustFilter = 0 ;
- ofn.nFilterIndex = 0 ;
- ofn.lpstrFile = szFileName ;
- ofn.nMaxFile = MAX_PATH ;
- ofn.lpstrFileTitle = szTitleName ;
- ofn.nMaxFileTitle = MAX_PATH ;
- ofn.lpstrInitialDir = NULL ;
- ofn.lpstrTitle = NULL ;
- ofn.Flags = 0 ;
- ofn.nFileOffset = 0 ;
- ofn.nFileExtension = 0 ;
- ofn.lpstrDefExt = TEXT ("bmp") ;
- ofn.lCustData = 0 ;
- ofn.lpfnHook = NULL ;
- ofn.lpTemplateName = NULL ;
-
- // Create the All-Purpose Palette
-
- hPalette = CreateAllPurposePalette () ;
- return 0 ;
-
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_COMMAND:
- switch (LOWORD (wParam))
- {
- case IDM_FILE_OPEN:
-
- // Show the File Open dialog box
-
- if (!GetOpenFileName (&ofn))
- return 0 ;
-
- // If there's an existing packed DIB, free the memory
-
- if (pPackedDib)
- {
- free (pPackedDib) ;
- pPackedDib = NULL ;
- }
-
- // Load the packed DIB into memory
-
- SetCursor (LoadCursor (NULL, IDC_WAIT)) ;
- ShowCursor (TRUE) ;
-
- pPackedDib = PackedDibLoad (szFileName) ;
-
- ShowCursor (FALSE) ;
- SetCursor (LoadCursor (NULL, IDC_ARROW)) ;
-
- if (!pPackedDib)
- {
- MessageBox (hwnd, TEXT ("Cannot load DIB file"),
- szAppName, 0) ;
- }
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- if (pPackedDib)
- {
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
-
- SetDIBitsToDevice (hdc,
- 0,
- 0,
- PackedDibGetWidth (pPackedDib),
- PackedDibGetHeight (pPackedDib),
- 0,
- 0,
- 0,
- PackedDibGetHeight (pPackedDib),
- PackedDibGetBitsPtr (pPackedDib),
- pPackedDib,
- DIB_RGB_COLORS) ;
- }
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_QUERYNEWPALETTE:
- hdc = GetDC (hwnd) ;
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
- InvalidateRect (hwnd, NULL, TRUE) ;
-
- ReleaseDC (hwnd, hdc) ;
- return TRUE ;
-
- case WM_PALETTECHANGED:
- if ((HWND) wParam != hwnd)
-
- hdc = GetDC (hwnd) ;
- SelectPalette (hdc, hPalette, FALSE) ;
- RealizePalette (hdc) ;
- UpdateColors (hdc) ;
-
- ReleaseDC (hwnd, hdc) ;
- break ;
-
- case WM_DESTROY:
- if (pPackedDib)
- free (pPackedDib) ;
-
- DeleteObject (hPalette) ;
-
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
-