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 <commctrl.h>
  21 #include <commdlg.h>
  22 #include <stdio.h>
  23
  24 #include "resource.h"
  25
  26 static HINSTANCE hInst;
  27 static HWND hMainWnd;
  28 static const WCHAR szAppName[] = L"View";
  29 static WCHAR szTitle[MAX_PATH];
  30 static WCHAR szFileTitle[MAX_PATH];
  31
  32 static HMETAFILE hmf;
  33 static HENHMETAFILE enhmf;
  34 static int deltax = 0, deltay = 0;
  35 static int width = 0, height = 0;
  36 static BOOL isAldus, isEnhanced;
  37
  38 #include "pshpack1.h"
  39 typedef struct
  40 {
  41         DWORD           key;
  42         WORD            hmf;
  43         SMALL_RECT      bbox;
  44         WORD            inch;
  45         DWORD           reserved;
  46         WORD            checksum;
  47 } APMFILEHEADER;
  48 #include "poppack.h"
  49
  50 #define APMHEADER_KEY   0x9AC6CDD7l
  51
  52
  53 static BOOL FileOpen(HWND hWnd, WCHAR *fn, int fnsz)
  54 {
  55   WCHAR filter[120], metafileFilter[100];
  56   OPENFILENAMEW ofn = { sizeof(OPENFILENAMEW),
  57                         0, 0, NULL, NULL, 0, 0, NULL,
  58                         fnsz, NULL, 0, NULL, NULL,
  59                         OFN_SHOWHELP, 0, 0, NULL, 0, NULL };
  60
  61   LoadStringW( hInst, IDS_OPEN_META_STRING, metafileFilter, ARRAY_SIZE(metafileFilter) );
  62   swprintf( filter, ARRAY_SIZE(filter), L"%s%c*.wmf;*.emf%c", metafileFilter, 0, 0 );
  63
  64   ofn.lpstrFilter = filter;
  65   ofn.hwndOwner = hWnd;
  66   ofn.lpstrFile = fn;
  67   if( fnsz < 1 )
  68     return FALSE;
  69   *fn = 0;
  70   return GetOpenFileNameW(&ofn);
  71 }
  72
  73 static BOOL FileIsEnhanced( LPCWSTR szFileName )
  74 {
  75   ENHMETAHEADER enh;
  76   HANDLE handle;
  77   DWORD size;
  78
  79   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
  80                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
  81   if (handle == INVALID_HANDLE_VALUE)
  82     return FALSE;
  83
  84   if (!ReadFile( handle, &enh, sizeof(ENHMETAHEADER), &size, NULL ) || size != sizeof(ENHMETAHEADER) )
  85   {
  86       CloseHandle( handle );
  87       return FALSE;
  88   }
  89   CloseHandle( handle );
  90
  91   /* Is it enhanced? */
  92   return (enh.dSignature == ENHMETA_SIGNATURE);
  93 }
  94
  95 static BOOL FileIsPlaceable( LPCWSTR szFileName )
  96 {
  97   APMFILEHEADER apmh;
  98   HANDLE handle;
  99   DWORD size;
 100
 101   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
 102                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
 103   if (handle == INVALID_HANDLE_VALUE)
 104     return FALSE;
 105
 106   if (!ReadFile( handle, &apmh, sizeof(APMFILEHEADER), &size, NULL ) || size != sizeof(APMFILEHEADER))
 107   {
 108       CloseHandle( handle );
 109       return FALSE;
 110   }
 111   CloseHandle( handle );
 112
 113   /* Is it placeable? */
 114   return (apmh.key == APMHEADER_KEY);
 115 }
 116
 117 static HMETAFILE GetPlaceableMetaFile( LPCWSTR szFileName )
 118 {
 119   LPBYTE lpData;
 120   METAHEADER mfHeader;
 121   APMFILEHEADER APMHeader;
 122   HANDLE handle;
 123   DWORD size;
 124   HMETAFILE hmf;
 125   WORD checksum, *p;
 126   HDC hdc;
 127   int i;
 128
 129   handle = CreateFileW( szFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
 130                         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
 131   if (handle == INVALID_HANDLE_VALUE)
 132     return 0;
 133
 134   if (!ReadFile( handle, &APMHeader, sizeof(APMFILEHEADER), &size, NULL ) || size != sizeof(APMFILEHEADER))
 135   {
 136       CloseHandle( handle );
 137       return 0;
 138   }
 139   checksum = 0;
 140   p = (WORD *) &APMHeader;
 141
 142   for(i=0; i<10; i++)
 143     checksum ^= *p++;
 144   if (checksum != APMHeader.checksum) {
 145     char msg[128];
 146     sprintf(msg, "Computed checksum %04x != stored checksum %04x\n",
 147            checksum, APMHeader.checksum);
 148     MessageBoxA(hMainWnd, msg, "Checksum failed", MB_OK);
 149     CloseHandle( handle );
 150     return 0;
 151   }
 152
 153   if (!ReadFile( handle, &mfHeader, sizeof(METAHEADER), &size, NULL) || size != sizeof(METAHEADER))
 154   {
 155       CloseHandle( handle );
 156       return 0;
 157   }
 158
 159   if (!(lpData = GlobalAlloc(GPTR, (mfHeader.mtSize * 2L))))
 160   {
 161       CloseHandle( handle );
 162       return 0;
 163   }
 164
 165   SetFilePointer( handle, sizeof(APMFILEHEADER), NULL, FILE_BEGIN );
 166   if (!ReadFile(handle, lpData, mfHeader.mtSize * 2, &size, NULL ) || size != mfHeader.mtSize * 2)
 167   {
 168     GlobalFree(lpData);
 169     CloseHandle( handle );
 170     return 0;
 171   }
 172   CloseHandle( handle );
 173
 174   if (!(hmf = SetMetaFileBitsEx(mfHeader.mtSize*2, lpData))) {
 175     GlobalFree(lpData);
 176     return 0;
 177   }
 178
 179
 180   width = APMHeader.bbox.Right - APMHeader.bbox.Left;
 181   height = APMHeader.bbox.Bottom - APMHeader.bbox.Top;
 182
 183   /*      printf("Ok! width %d height %d inch %d\n", width, height, APMHeader.inch);  */
 184   hdc = GetDC(hMainWnd);
 185   width = width * GetDeviceCaps(hdc, LOGPIXELSX)/APMHeader.inch;
 186   height = height * GetDeviceCaps(hdc,LOGPIXELSY)/APMHeader.inch;
 187   ReleaseDC(hMainWnd, hdc);
 188
 189   deltax = 0;
 190   deltay = 0 ;
 191   GlobalFree(lpData);
 192   return hmf;
 193 }
 194
 195 static void DoOpenFile(LPCWSTR filename)
 196 {
 197   if (!filename) return;
 198
 199   isAldus = FileIsPlaceable(filename);
 200   if (isAldus) {
 201     hmf = GetPlaceableMetaFile(filename);
 202   } else {
 203     RECT r;
 204     isEnhanced = FileIsEnhanced(filename);
 205     if (isEnhanced)
 206        enhmf = GetEnhMetaFileW(filename);
 207     else
 208        hmf = GetMetaFileW(filename);
 209     GetClientRect(hMainWnd, &r);
 210     width = r.right - r.left;
 211     height = r.bottom - r.top;
 212   }
 213   InvalidateRect( hMainWnd, NULL, TRUE );
 214 }
 215
 216 static void UpdateWindowCaption(void)
 217 {
 218   WCHAR szCaption[MAX_PATH];
 219   WCHAR szView[MAX_PATH];
 220
 221   LoadStringW(hInst, IDS_DESCRIPTION, szView, ARRAY_SIZE(szView));
 222
 223   if (szFileTitle[0] != '\0')
 224   {
 225     lstrcpyW(szCaption, szFileTitle);
 226     LoadStringW(hInst, IDS_DESCRIPTION, szView, ARRAY_SIZE(szView));
 227     lstrcatW(szCaption, L" - ");
 228     lstrcatW(szCaption, szView);
 229   }
 230   else
 231     lstrcpyW(szCaption, szView);
 232
 233   SetWindowTextW(hMainWnd, szCaption);
 234 }
 235
 236 static LRESULT CALLBACK WndProc(HWND hwnd, UINT uMessage, WPARAM wparam, LPARAM lparam)
 237 {
 238   switch (uMessage)
 239     {
 240     case WM_PAINT:
 241       {
 242         PAINTSTRUCT ps;
 243         BeginPaint(hwnd, &ps);
 244         SetMapMode(ps.hdc, MM_ANISOTROPIC);
 245         /* Set the window extent to a sane value in case the metafile doesn't */
 246         SetWindowExtEx(ps.hdc, width, height, NULL);
 247         SetViewportExtEx(ps.hdc, width, height, NULL);
 248         SetViewportOrgEx(ps.hdc, deltax, deltay, NULL);
 249        if (isEnhanced && enhmf)
 250        {
 251            RECT r;
 252            GetClientRect(hwnd, &r);
 253            PlayEnhMetaFile(ps.hdc, enhmf, &r);
 254        }
 255        else if (hmf)
 256            PlayMetaFile(ps.hdc, hmf);
 257         EndPaint(hwnd, &ps);
 258       }
 259       break;
 260
 261     case WM_COMMAND: /* message: command from application menu */
 262         switch (LOWORD(wparam))
 263         {
 264         case IDM_OPEN:
 265           {
 266               WCHAR filename[MAX_PATH];
 267               if (FileOpen(hwnd, filename, ARRAY_SIZE(filename)))
 268               {
 269                   szFileTitle[0] = 0;
 270                   GetFileTitleW(filename, szFileTitle, ARRAY_SIZE(szFileTitle));
 271                   DoOpenFile(filename);
 272                   UpdateWindowCaption();
 273               }
 274           }
 275           break;
 276
 277         case IDM_SET_EXT_TO_WIN:
 278           {
 279             RECT r;
 280             GetClientRect(hwnd, &r);
 281             width = r.right - r.left;
 282             height = r.bottom - r.top;
 283             deltax = deltay = 0;
 284             InvalidateRect( hwnd, NULL, TRUE );
 285           }
 286           break;
 287
 288
 289         case IDM_LEFT:
 290           deltax += 100;
 291           InvalidateRect( hwnd, NULL, TRUE );
 292           break;
 293         case IDM_RIGHT:
 294           deltax -= 100;
 295           InvalidateRect( hwnd, NULL, TRUE );
 296           break;
 297         case IDM_UP:
 298           deltay += 100;
 299           InvalidateRect( hwnd, NULL, TRUE );
 300           break;
 301         case IDM_DOWN:
 302           deltay -= 100;
 303           InvalidateRect( hwnd, NULL, TRUE );
 304           break;
 305
 306         case IDM_EXIT:
 307           DestroyWindow(hwnd);
 308           break;
 309
 310         default:
 311           return DefWindowProcW(hwnd, uMessage, wparam, lparam);
 312         }
 313       break;
 314
 315     case WM_DESTROY:  /* message: window being destroyed */
 316       PostQuitMessage(0);
 317       break;
 318
 319     default:          /* Passes it on if unprocessed */
 320       return DefWindowProcW(hwnd, uMessage, wparam, lparam);
 321     }
 322     return 0;
 323 }
 324
 325 static BOOL InitApplication(HINSTANCE hInstance)
 326 {
 327   WNDCLASSEXW wc;
 328
 329   /* Load the application description strings */
 330   LoadStringW(hInstance, IDS_DESCRIPTION, szTitle, ARRAY_SIZE(szTitle));
 331
 332   /* Fill in window class structure with parameters that describe the
 333      main window */
 334
 335   wc.cbSize        = sizeof(WNDCLASSEXW);
 336   wc.style         = CS_HREDRAW | CS_VREDRAW;             /* Class style(s) */
 337   wc.lpfnWndProc   = WndProc;                             /* Window Procedure */
 338   wc.cbClsExtra    = 0;                          /* No per-class extra data */
 339   wc.cbWndExtra    = 0;                         /* No per-window extra data */
 340   wc.hInstance     = hInstance;                      /* Owner of this class */
 341   wc.hIcon         = NULL;
 342   wc.hIconSm       = NULL;
 343   wc.hCursor       = LoadCursorW(NULL, (LPWSTR)IDC_ARROW);
 344   wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);           /* Default color */
 345   wc.lpszMenuName  = szAppName;                       /* Menu name from .rc */
 346   wc.lpszClassName = szAppName;                      /* Name to register as */
 347
 348   if (!RegisterClassExW(&wc)) return FALSE;
 349
 350   /* Call module specific initialization functions here */
 351
 352   return TRUE;
 353 }
 354
 355 static BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
 356 {
 357     /* Save the instance handle in a global variable for later use */
 358     hInst = hInstance;
 359
 360     /* Create main window */
 361     hMainWnd = CreateWindowW(szAppName,          /* See RegisterClass() call */
 362                             szTitle,             /* window title */
 363                             WS_OVERLAPPEDWINDOW, /* Window style */
 364                             CW_USEDEFAULT, 0,    /* positioning */
 365                             CW_USEDEFAULT, 0,    /* size */
 366                             NULL,                /* Overlapped has no parent */
 367                             NULL,                /* Use the window class menu */
 368                             hInstance,
 369                             NULL);
 370
 371     if (!hMainWnd)
 372         return FALSE;
 373
 374     /* Call module specific instance initialization functions here */
 375
 376     /* show the window, and paint it for the first time */
 377     ShowWindow(hMainWnd, nCmdShow);
 378     UpdateWindow(hMainWnd);
 379
 380     return TRUE;
 381 }
 382
 383 static void HandleCommandLine(LPWSTR cmdline)
 384 {
 385     /* skip white space */
 386     while (*cmdline == ' ') cmdline++;
 387
 388     if (*cmdline)
 389     {
 390         /* file name is passed on the command line */
 391         if (cmdline[0] == '"')
 392         {
 393             cmdline++;
 394             cmdline[lstrlenW(cmdline) - 1] = 0;
 395         }
 396         szFileTitle[0] = 0;
 397         GetFileTitleW(cmdline, szFileTitle, ARRAY_SIZE(szFileTitle));
 398         DoOpenFile(cmdline);
 399         UpdateWindowCaption();
 400     }
 401 }
 402
 403 int APIENTRY wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
 404 {
 405     MSG msg;
 406
 407     InitCommonControls();
 408
 409     /* Other instances of app running? */
 410     if (!hPrevInstance)
 411     {
 412       /* stuff to be done once */
 413       if (!InitApplication(hInstance))
 414       {
 415         return FALSE;      /* exit */
 416       }
 417     }
 418
 419     /* stuff to be done every time */
 420     if (!InitInstance(hInstance, nCmdShow))
 421     {
 422       return FALSE;
 423     }
 424
 425     HandleCommandLine(lpCmdLine);
 426
 427     /* Main loop */
 428     /* Acquire and dispatch messages until a WM_QUIT message is received */
 429     while (GetMessageW(&msg, NULL, 0, 0))
 430     {
 431         TranslateMessage(&msg);
 432         DispatchMessageW(&msg);
 433     }
 434
 435     return msg.wParam;
 436 }