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 <windowsx.h>
  21 #include "resource.h"
  22
  23 #include "globals.h"
  24 #include <stdio.h>
  25
  26 BOOL FileIsPlaceable( LPCSTR szFileName );
  27 HMETAFILE GetPlaceableMetaFile( HWND hwnd, LPCSTR szFileName );
  28
  29 HMETAFILE hmf;
  30 int deltax = 0, deltay = 0;
  31 int width = 0, height = 0;
  32 BOOL isAldus;
  33
  34 static BOOL FileOpen(HWND hWnd, char *fn, int fnsz)
  35 {
  36   OPENFILENAME ofn = { sizeof(OPENFILENAME),
  37                        0, 0, NULL, NULL, 0, 0, NULL,
  38                        fnsz, NULL, 0, NULL, NULL,
  39                        OFN_SHOWHELP, 0, 0, NULL, 0, NULL };
  40   ofn.lpstrFilter = "Metafiles\0*.wmf\0";
  41   ofn.hwndOwner = hWnd;
  42   ofn.lpstrFile = fn;
  43   if( fnsz < 1 )
  44     return FALSE;
  45   *fn = 0;
  46   return GetOpenFileName(&ofn);
  47 }
  48
  49
  50 LRESULT CALLBACK WndProc(HWND hwnd,
  51                          UINT uMessage,
  52                          WPARAM wparam,
  53                          LPARAM lparam)
  54 {
  55   switch (uMessage)
  56     {
  57     case WM_PAINT:
  58       {
  59         PAINTSTRUCT ps;
  60         BeginPaint(hwnd, &ps);
  61         SetMapMode(ps.hdc, MM_ANISOTROPIC);
  62         /* Set the window extent to a sane value in case the metafile doesn't */
  63         SetWindowExtEx(ps.hdc, width, height, NULL);
  64         SetViewportExtEx(ps.hdc, width, height, NULL);
  65         SetViewportOrgEx(ps.hdc, deltax, deltay, NULL);
  66         if(hmf) PlayMetaFile(ps.hdc, hmf);
  67         EndPaint(hwnd, &ps);
  68       }
  69       break;
  70
  71     case WM_COMMAND: /* message: command from application menu */
  72       switch (GET_WM_COMMAND_ID(wparam,lparam))
  73         {
  74         case IDM_OPEN:
  75           {
  76             char filename[MAX_PATH];
  77             if (FileOpen(hwnd, filename, sizeof(filename))) {
  78               isAldus = FileIsPlaceable(filename);
  79               if (isAldus) {
  80                 hmf = GetPlaceableMetaFile(hwnd, filename);
  81               } else {
  82                 RECT r;
  83                 hmf = GetMetaFile(filename);
  84                 GetClientRect(hwnd, &r);
  85                 width = r.right - r.left;
  86                 height = r.bottom - r.top;
  87               }
  88               InvalidateRect( hwnd, NULL, TRUE );
  89             }
  90           }
  91           break;
  92
  93         case IDM_SET_EXT_TO_WIN:
  94           {
  95             RECT r;
  96             GetClientRect(hwnd, &r);
  97             width = r.right - r.left;
  98             height = r.bottom - r.top;
  99             deltax = deltay = 0;
 100             InvalidateRect( hwnd, NULL, TRUE );
 101           }
 102           break;
 103
 104
 105         case IDM_LEFT:
 106           deltax += 100;
 107           InvalidateRect( hwnd, NULL, TRUE );
 108           break;
 109         case IDM_RIGHT:
 110           deltax -= 100;
 111           InvalidateRect( hwnd, NULL, TRUE );
 112           break;
 113         case IDM_UP:
 114           deltay += 100;
 115           InvalidateRect( hwnd, NULL, TRUE );
 116           break;
 117         case IDM_DOWN:
 118           deltay -= 100;
 119           InvalidateRect( hwnd, NULL, TRUE );
 120           break;
 121
 122         case IDM_EXIT:
 123           DestroyWindow(hwnd);
 124           break;
 125
 126         default:
 127           return DefWindowProc(hwnd, uMessage, wparam, lparam);
 128         }
 129       break;
 130
 131     case WM_DESTROY:  /* message: window being destroyed */
 132       PostQuitMessage(0);
 133       break;
 134
 135     default:          /* Passes it on if unprocessed */
 136       return DefWindowProc(hwnd, uMessage, wparam, lparam);
 137     }
 138     return 0;
 139 }
 140
 141 BOOL FileIsPlaceable( LPCSTR szFileName )
 142 {
 143   HFILE         hInFile;
 144   APMFILEHEADER apmh;
 145
 146   if( (hInFile = _lopen( szFileName, OF_READ ) ) == HFILE_ERROR )
 147     return FALSE;
 148
 149   if( _lread( hInFile, &apmh, sizeof(APMFILEHEADER) )
 150       != sizeof(APMFILEHEADER) )
 151     {
 152       _lclose( hInFile );
 153       return FALSE;
 154     }
 155   _lclose( hInFile );
 156
 157   /* Is it placeable? */
 158   return (apmh.key == APMHEADER_KEY);
 159 }
 160
 161 HMETAFILE GetPlaceableMetaFile( HWND hwnd, LPCSTR szFileName )
 162 {
 163   LPBYTE lpData;
 164   METAHEADER mfHeader;
 165   APMFILEHEADER APMHeader;
 166   HFILE fh;
 167   HMETAFILE hmf;
 168   WORD checksum, *p;
 169   HDC hdc;
 170   int i;
 171
 172   if( (fh = _lopen( szFileName, OF_READ ) ) == HFILE_ERROR ) return 0;
 173   _llseek(fh, 0, 0);
 174   if (!_lread(fh, (LPSTR)&APMHeader, sizeof(APMFILEHEADER))) return 0;
 175   _llseek(fh, sizeof(APMFILEHEADER), 0);
 176   checksum = 0;
 177   p = (WORD *) &APMHeader;
 178
 179   for(i=0; i<10; i++)
 180     checksum ^= *p++;
 181   if (checksum != APMHeader.checksum) {
 182     char msg[128];
 183     sprintf(msg, "Computed checksum %04x != stored checksum %04x\n",
 184            checksum, APMHeader.checksum);
 185         MessageBox(hwnd, msg, "Checksum failed", MB_OK);
 186     return 0;
 187   }
 188
 189   if (!_lread(fh, (LPSTR)&mfHeader, sizeof(METAHEADER))) return 0;
 190
 191   if (!(lpData = GlobalAlloc(GPTR, (mfHeader.mtSize * 2L)))) return 0;
 192
 193   _llseek(fh, sizeof(APMFILEHEADER), 0);
 194   if (!_lread(fh, lpData, (UINT)(mfHeader.mtSize * 2L)))
 195   {
 196     GlobalFree((HGLOBAL)lpData);
 197     _lclose(fh);
 198     return 0;
 199   }
 200   _lclose(fh);
 201
 202   if (!(hmf = SetMetaFileBitsEx(mfHeader.mtSize*2, lpData)))
 203     return 0;
 204
 205
 206   width = APMHeader.bbox.Right - APMHeader.bbox.Left;
 207   height = APMHeader.bbox.Bottom - APMHeader.bbox.Top;
 208
 209   /*      printf("Ok! width %d height %d inch %d\n", width, height, APMHeader.inch);  */
 210   hdc = GetDC(hwnd);
 211   width = width * GetDeviceCaps(hdc, LOGPIXELSX)/APMHeader.inch;
 212   height = height * GetDeviceCaps(hdc,LOGPIXELSY)/APMHeader.inch;
 213   ReleaseDC(hwnd, hdc);
 214
 215   deltax = 0;
 216   deltay = 0 ;
 217   return hmf;
 218 }