programs/view/view.c

   1 /*
   2  * Copyright 1998 Douglas Ridgway
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <windows.h>
  20 #include <commdlg.h>
  21 #include "resource.h"
  22
  23 #include <stdio.h>
  24
  25 static HINSTANCE hInst;
  26 static HWND hMainWnd;
  27 static WCHAR szAppName[5] = {'V','i','e','w',0};
  28 static WCHAR szTitle[MAX_PATH];
  29 static WCHAR szFileTitle[MAX_PATH];
  30
  31 static HMETAFILE hmf;
  32 static HENHMETAFILE enhmf;
  33 static int deltax = 0, deltay = 0;
  34 static int width = 0, height = 0;
  35 static BOOL isAldus, isEnhanced;
  36
  37 #include "pshpack1.h"
  38 typedef struct
  39 {
  40         DWORD           key;
  41         WORD            hmf;
  42         SMALL_RECT      bbox;
  43         WORD            inch;
  44         DWORD           reserved;
  45         WORD            checksum;
  46 } APMFILEHEADER;
  47 #include "poppack.h"
  48
  49 #define APMHEADER_KEY   0x9AC6CDD7l
  50
  51
  52 static BOOL FileOpen(HWND hWnd, WCHAR *fn, int fnsz)
  53 {
  54   static const WCHAR filter[] = {'M','e','t','a','f','i','l','e','s','\0','*','.','w','m','f',';','*','.','e','m','f','\0',0};
  55   OPENFILENAMEW ofn = { sizeof(OPENFILENAMEW),
  56                         0, 0, NULL, NULL, 0, 0, NULL,
  57                         fnsz, NULL, 0, NULL, NULL,
  58                         OFN_SHOWHELP, 0, 0, NULL, 0, NULL };
  59   ofn.lpstrFilter = filter;
  60   ofn.hwndOwner = hWnd;
  61   ofn.lpstrFile = fn;
  62   if( fnsz < 1 )
  63     return FALSE;
  64   *fn = 0;
  65   return GetOpenFileNameW(&ofn);
  66 }
  67
  68 static BOOL FileIsEnhanced( LPCWSTR szFileName )
  69 {
  70   ENHMETAHEADER enh;
  71   HANDLE handle;
  72   DWORD size;
  73
  74   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
  75                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
  76   if (handle == INVALID_HANDLE_VALUE)
  77     return FALSE;
  78
  79   if (!ReadFile( handle, &enh, sizeof(ENHMETAHEADER), &size, NULL ) || size != sizeof(ENHMETAHEADER) )
  80   {
  81       CloseHandle( handle );
  82       return FALSE;
  83   }
  84   CloseHandle( handle );
  85
  86   /* Is it enhanced? */
  87   return (enh.dSignature == ENHMETA_SIGNATURE);
  88 }
  89
  90 static BOOL FileIsPlaceable( LPCWSTR szFileName )
  91 {
  92   APMFILEHEADER apmh;
  93   HANDLE handle;
  94   DWORD size;
  95
  96   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
  97                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
  98   if (handle == INVALID_HANDLE_VALUE)
  99     return FALSE;
 100
 101   if (!ReadFile( handle, &apmh, sizeof(APMFILEHEADER), &size, NULL ) || size != sizeof(APMFILEHEADER))
 102   {
 103       CloseHandle( handle );
 104       return FALSE;
 105   }
 106   CloseHandle( handle );
 107
 108   /* Is it placeable? */
 109   return (apmh.key == APMHEADER_KEY);
 110 }
 111
 112 static HMETAFILE GetPlaceableMetaFile( LPCWSTR szFileName )
 113 {
 114   LPBYTE lpData;
 115   METAHEADER mfHeader;
 116   APMFILEHEADER APMHeader;
 117   HANDLE handle;
 118   DWORD size;
 119   HMETAFILE hmf;
 120   WORD checksum, *p;
 121   HDC hdc;
 122   int i;
 123
 124   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
 125                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
 126   if (handle == INVALID_HANDLE_VALUE)
 127     return 0;
 128
 129   if (!ReadFile( handle, &APMHeader, sizeof(APMFILEHEADER), &size, NULL ) || size != sizeof(APMFILEHEADER))
 130   {
 131       CloseHandle( handle );
 132       return 0;
 133   }
 134   checksum = 0;
 135   p = (WORD *) &APMHeader;
 136
 137   for(i=0; i<10; i++)
 138     checksum ^= *p++;
 139   if (checksum != APMHeader.checksum) {
 140     char msg[128];
 141     sprintf(msg, "Computed checksum %04x != stored checksum %04x\n",
 142            checksum, APMHeader.checksum);
 143     MessageBoxA(hMainWnd, msg, "Checksum failed", MB_OK);
 144     CloseHandle( handle );
 145     return 0;
 146   }
 147
 148   if (!ReadFile( handle, &mfHeader, sizeof(METAHEADER), &size, NULL) || size != sizeof(METAHEADER))
 149   {
 150       CloseHandle( handle );
 151       return 0;
 152   }
 153
 154   if (!(lpData = GlobalAlloc(GPTR, (mfHeader.mtSize * 2L))))
 155   {
 156       CloseHandle( handle );
 157       return 0;
 158   }
 159
 160   SetFilePointer( handle, sizeof(APMFILEHEADER), NULL, FILE_BEGIN );
 161   if (!ReadFile(handle, lpData, mfHeader.mtSize * 2, &size, NULL ) || size != mfHeader.mtSize * 2)
 162   {
 163     GlobalFree(lpData);
 164     CloseHandle( handle );
 165     return 0;
 166   }
 167   CloseHandle( handle );
 168
 169   if (!(hmf = SetMetaFileBitsEx(mfHeader.mtSize*2, lpData)))
 170     return 0;
 171
 172
 173   width = APMHeader.bbox.Right - APMHeader.bbox.Left;
 174   height = APMHeader.bbox.Bottom - APMHeader.bbox.Top;
 175
 176   /*      printf("Ok! width %d height %d inch %d\n", width, height, APMHeader.inch);  */
 177   hdc = GetDC(hMainWnd);
 178   width = width * GetDeviceCaps(hdc, LOGPIXELSX)/APMHeader.inch;
 179   height = height * GetDeviceCaps(hdc,LOGPIXELSY)/APMHeader.inch;
 180   ReleaseDC(hMainWnd, hdc);
 181
 182   deltax = 0;
 183   deltay = 0 ;
 184   return hmf;
 185 }
 186
 187 static void DoOpenFile(LPCWSTR filename)
 188 {
 189   if (!filename) return;
 190
 191   isAldus = FileIsPlaceable(filename);
 192   if (isAldus) {
 193     hmf = GetPlaceableMetaFile(filename);
 194   } else {
 195     RECT r;
 196     isEnhanced = FileIsEnhanced(filename);
 197     if (isEnhanced)
 198        enhmf = GetEnhMetaFileW(filename);
 199     else
 200        hmf = GetMetaFileW(filename);
 201     GetClientRect(hMainWnd, &r);
 202     width = r.right - r.left;
 203     height = r.bottom - r.top;
 204   }
 205   InvalidateRect( hMainWnd, NULL, TRUE );
 206 }
 207
 208 static void UpdateWindowCaption(void)
 209 {
 210   WCHAR szCaption[MAX_PATH];
 211   WCHAR szView[MAX_PATH];
 212   static const WCHAR hyphenW[] = { ' ','-',' ',0 };
 213
 214   LoadStringW(hInst, IDS_DESCRIPTION, szView, sizeof(szView)/sizeof(WCHAR));
 215
 216   if (szFileTitle[0] != '\0')
 217   {
 218     lstrcpyW(szCaption, szFileTitle);
 219     LoadStringW(hInst, IDS_DESCRIPTION, szView, sizeof(szView)/sizeof(WCHAR));
 220     lstrcatW(szCaption, hyphenW);
 221     lstrcatW(szCaption, szView);
 222   }
 223   else
 224     lstrcpyW(szCaption, szView);
 225
 226   SetWindowTextW(hMainWnd, szCaption);
 227 }
 228
 229 static LRESULT CALLBACK WndProc(HWND hwnd, UINT uMessage, WPARAM wparam, LPARAM lparam)
 230 {
 231   switch (uMessage)
 232     {
 233     case WM_PAINT:
 234       {
 235         PAINTSTRUCT ps;
 236         BeginPaint(hwnd, &ps);
 237         SetMapMode(ps.hdc, MM_ANISOTROPIC);
 238         /* Set the window extent to a sane value in case the metafile doesn't */
 239         SetWindowExtEx(ps.hdc, width, height, NULL);
 240         SetViewportExtEx(ps.hdc, width, height, NULL);
 241         SetViewportOrgEx(ps.hdc, deltax, deltay, NULL);
 242        if (isEnhanced && enhmf)
 243        {
 244            RECT r;
 245            GetClientRect(hwnd, &r);
 246            PlayEnhMetaFile(ps.hdc, enhmf, &r);
 247        }
 248        else if (hmf)
 249            PlayMetaFile(ps.hdc, hmf);
 250         EndPaint(hwnd, &ps);
 251       }
 252       break;
 253
 254     case WM_COMMAND: /* message: command from application menu */
 255         switch (LOWORD(wparam))
 256         {
 257         case IDM_OPEN:
 258           {
 259               WCHAR filename[MAX_PATH];
 260               if (FileOpen(hwnd, filename, sizeof(filename)/sizeof(WCHAR)))
 261               {
 262                   szFileTitle[0] = 0;
 263                   GetFileTitleW(filename, szFileTitle, sizeof(szFileTitle));
 264                   DoOpenFile(filename);
 265                   UpdateWindowCaption();
 266               }
 267           }
 268           break;
 269
 270         case IDM_SET_EXT_TO_WIN:
 271           {
 272             RECT r;
 273             GetClientRect(hwnd, &r);
 274             width = r.right - r.left;
 275             height = r.bottom - r.top;
 276             deltax = deltay = 0;
 277             InvalidateRect( hwnd, NULL, TRUE );
 278           }
 279           break;
 280
 281
 282         case IDM_LEFT:
 283           deltax += 100;
 284           InvalidateRect( hwnd, NULL, TRUE );
 285           break;
 286         case IDM_RIGHT:
 287           deltax -= 100;
 288           InvalidateRect( hwnd, NULL, TRUE );
 289           break;
 290         case IDM_UP:
 291           deltay += 100;
 292           InvalidateRect( hwnd, NULL, TRUE );
 293           break;
 294         case IDM_DOWN:
 295           deltay -= 100;
 296           InvalidateRect( hwnd, NULL, TRUE );
 297           break;
 298
 299         case IDM_EXIT:
 300           DestroyWindow(hwnd);
 301           break;
 302
 303         default:
 304           return DefWindowProcW(hwnd, uMessage, wparam, lparam);
 305         }
 306       break;
 307
 308     case WM_DESTROY:  /* message: window being destroyed */
 309       PostQuitMessage(0);
 310       break;
 311
 312     default:          /* Passes it on if unprocessed */
 313       return DefWindowProcW(hwnd, uMessage, wparam, lparam);
 314     }
 315     return 0;
 316 }
 317
 318 static BOOL InitApplication(HINSTANCE hInstance)
 319 {
 320   WNDCLASSEXW wc;
 321
 322   /* Load the application description strings */
 323   LoadStringW(hInstance, IDS_DESCRIPTION, szTitle, sizeof(szTitle)/sizeof(WCHAR));
 324
 325   /* Fill in window class structure with parameters that describe the
 326      main window */
 327
 328   wc.cbSize        = sizeof(WNDCLASSEXW);
 329   wc.style         = CS_HREDRAW | CS_VREDRAW;             /* Class style(s) */
 330   wc.lpfnWndProc   = WndProc;                             /* Window Procedure */
 331   wc.cbClsExtra    = 0;                          /* No per-class extra data */
 332   wc.cbWndExtra    = 0;                         /* No per-window extra data */
 333   wc.hInstance     = hInstance;                      /* Owner of this class */
 334   wc.hIcon         = NULL;
 335   wc.hIconSm       = NULL;
 336   wc.hCursor       = LoadCursorW(NULL, (LPWSTR)IDC_ARROW);
 337   wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);           /* Default color */
 338   wc.lpszMenuName  = szAppName;                       /* Menu name from .rc */
 339   wc.lpszClassName = szAppName;                      /* Name to register as */
 340
 341   if (!RegisterClassExW(&wc)) return FALSE;
 342
 343   /* Call module specific initialization functions here */
 344
 345   return TRUE;
 346 }
 347
 348 static BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
 349 {
 350     /* Save the instance handle in a global variable for later use */
 351     hInst = hInstance;
 352
 353     /* Create main window */
 354     hMainWnd = CreateWindowW(szAppName,          /* See RegisterClass() call */
 355                             szTitle,             /* window title */
 356                             WS_OVERLAPPEDWINDOW, /* Window style */
 357                             CW_USEDEFAULT, 0,    /* positioning */
 358                             CW_USEDEFAULT, 0,    /* size */
 359                             NULL,                /* Overlapped has no parent */
 360                             NULL,                /* Use the window class menu */
 361                             hInstance,
 362                             NULL);
 363
 364     if (!hMainWnd)
 365         return FALSE;
 366
 367     /* Call module specific instance initialization functions here */
 368
 369     /* show the window, and paint it for the first time */
 370     ShowWindow(hMainWnd, nCmdShow);
 371     UpdateWindow(hMainWnd);
 372
 373     return TRUE;
 374 }
 375
 376 static void HandleCommandLine(LPWSTR cmdline)
 377 {
 378     /* skip white space */
 379     while (*cmdline == ' ') cmdline++;
 380
 381     if (*cmdline)
 382     {
 383         /* file name is passed on the command line */
 384         if (cmdline[0] == '"')
 385         {
 386             cmdline++;
 387             cmdline[lstrlenW(cmdline) - 1] = 0;
 388         }
 389         szFileTitle[0] = 0;
 390         GetFileTitleW(cmdline, szFileTitle, sizeof(szFileTitle));
 391         DoOpenFile(cmdline);
 392         UpdateWindowCaption();
 393     }
 394 }
 395
 396 int APIENTRY wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
 397 {
 398     MSG msg;
 399
 400     /* Other instances of app running? */
 401     if (!hPrevInstance)
 402     {
 403       /* stuff to be done once */
 404       if (!InitApplication(hInstance))
 405       {
 406         return FALSE;      /* exit */
 407       }
 408     }
 409
 410     /* stuff to be done every time */
 411     if (!InitInstance(hInstance, nCmdShow))
 412     {
 413       return FALSE;
 414     }
 415
 416     HandleCommandLine(lpCmdLine);
 417
 418     /* Main loop */
 419     /* Acquire and dispatch messages until a WM_QUIT message is received */
 420     while (GetMessageW(&msg, NULL, 0, 0))
 421     {
 422         TranslateMessage(&msg);
 423         DispatchMessageW(&msg);
 424     }
 425
 426     return msg.wParam;
 427 }