dlls/gdi32/metafile16.c

   1 /*
   2  * Metafile functions
   3  *
   4  * Copyright  David W. Metcalfe, 1994
   5  * Copyright  Niels de Carpentier, 1996
   6  * Copyright  Albrecht Kleine, 1996
   7  * Copyright  Huw Davies, 1996
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 #include "config.h"
  25
  26 #include <string.h>
  27 #include <fcntl.h>
  28
  29 #include "wine/winbase16.h"
  30 #include "wine/wingdi16.h"
  31 #include "wownt32.h"
  32 #include "winreg.h"
  33 #include "winternl.h"
  34 #include "gdi_private.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(metafile);
  38
  39 /******************************************************************
  40  *         MF_GetMetaHeader16
  41  *
  42  * Returns ptr to METAHEADER associated with HMETAFILE16
  43  * Should be followed by call to MF_ReleaseMetaHeader16
  44  */
  45 static METAHEADER *MF_GetMetaHeader16( HMETAFILE16 hmf )
  46 {
  47     return GlobalLock16(hmf);
  48 }
  49
  50 /******************************************************************
  51  *         MF_ReleaseMetaHeader16
  52  *
  53  * Releases METAHEADER associated with HMETAFILE16
  54  */
  55 static BOOL16 MF_ReleaseMetaHeader16( HMETAFILE16 hmf )
  56 {
  57     return GlobalUnlock16( hmf );
  58 }
  59
  60 /******************************************************************
  61  *           DeleteMetaFile   (GDI.127)
  62  */
  63 BOOL16 WINAPI DeleteMetaFile16(  HMETAFILE16 hmf )
  64 {
  65     return !GlobalFree16( hmf );
  66 }
  67
  68 /******************************************************************
  69  *         GetMetaFile   (GDI.124)
  70  */
  71 HMETAFILE16 WINAPI GetMetaFile16( LPCSTR lpFilename )
  72 {
  73     METAHEADER *mh;
  74     HANDLE hFile;
  75
  76     TRACE("%s\n", lpFilename);
  77
  78     if(!lpFilename)
  79         return 0;
  80
  81     if((hFile = CreateFileA(lpFilename, GENERIC_READ, FILE_SHARE_READ, NULL,
  82                             OPEN_EXISTING, 0, 0)) == INVALID_HANDLE_VALUE)
  83         return 0;
  84
  85     mh = MF_ReadMetaFile(hFile);
  86     CloseHandle(hFile);
  87     if(!mh) return 0;
  88     return MF_Create_HMETAFILE16( mh );
  89 }
  90
  91 /******************************************************************
  92  *         CopyMetaFile   (GDI.151)
  93  */
  94 HMETAFILE16 WINAPI CopyMetaFile16( HMETAFILE16 hSrcMetaFile, LPCSTR lpFilename)
  95 {
  96     METAHEADER *mh = MF_GetMetaHeader16( hSrcMetaFile );
  97     METAHEADER *mh2 = NULL;
  98     HANDLE hFile;
  99
 100     TRACE("(%08x,%s)\n", hSrcMetaFile, lpFilename);
 101
 102     if(!mh) return 0;
 103
 104     if(mh->mtType == METAFILE_DISK)
 105         mh2 = MF_LoadDiskBasedMetaFile(mh);
 106     else {
 107         mh2 = HeapAlloc( GetProcessHeap(), 0, mh->mtSize * 2 );
 108         memcpy( mh2, mh, mh->mtSize * 2 );
 109     }
 110     MF_ReleaseMetaHeader16( hSrcMetaFile );
 111
 112     if(lpFilename) {         /* disk based metafile */
 113         DWORD w;
 114         if((hFile = CreateFileA(lpFilename, GENERIC_WRITE, 0, NULL,
 115                                 CREATE_ALWAYS, 0, 0)) == INVALID_HANDLE_VALUE) {
 116             HeapFree( GetProcessHeap(), 0, mh2 );
 117             return 0;
 118         }
 119         WriteFile(hFile, mh2, mh2->mtSize * 2, &w, NULL);
 120         CloseHandle(hFile);
 121         mh2 = MF_CreateMetaHeaderDisk(mh2, lpFilename, FALSE);
 122     }
 123
 124     return MF_Create_HMETAFILE16( mh2 );
 125 }
 126
 127 /******************************************************************
 128  *         IsValidMetaFile   (GDI.410)
 129  *
 130  *  Attempts to check if a given metafile is correctly formatted.
 131  *  Currently, the only things verified are several properties of the
 132  *  header.
 133  *
 134  * RETURNS
 135  *  TRUE if hmf passes some tests for being a valid metafile, FALSE otherwise.
 136  *
 137  * BUGS
 138  *  This is not exactly what windows does, see _Undocumented_Windows_
 139  *  for details.
 140  */
 141 BOOL16 WINAPI IsValidMetaFile16(HMETAFILE16 hmf)
 142 {
 143     BOOL16 res=FALSE;
 144     METAHEADER *mh = MF_GetMetaHeader16(hmf);
 145     if (mh) {
 146         if (mh->mtType == METAFILE_MEMORY || mh->mtType == METAFILE_DISK)
 147             if (mh->mtHeaderSize == MFHEADERSIZE/sizeof(INT16))
 148                 if (mh->mtVersion == MFVERSION)
 149                     res=TRUE;
 150         MF_ReleaseMetaHeader16(hmf);
 151     }
 152     TRACE("IsValidMetaFile %x => %d\n",hmf,res);
 153     return res;
 154 }
 155
 156 /******************************************************************
 157  *         PlayMetaFile   (GDI.123)
 158  *
 159  */
 160 BOOL16 WINAPI PlayMetaFile16( HDC16 hdc, HMETAFILE16 hmf )
 161 {
 162     BOOL16 ret;
 163     METAHEADER *mh = MF_GetMetaHeader16( hmf );
 164     ret = MF_PlayMetaFile( HDC_32(hdc), mh );
 165     MF_ReleaseMetaHeader16( hmf );
 166     return ret;
 167 }
 168
 169
 170 /******************************************************************
 171  *            EnumMetaFile   (GDI.175)
 172  *
 173  */
 174 BOOL16 WINAPI EnumMetaFile16( HDC16 hdc16, HMETAFILE16 hmf,
 175                               MFENUMPROC16 lpEnumFunc, LPARAM lpData )
 176 {
 177     METAHEADER *mh = MF_GetMetaHeader16(hmf);
 178     METARECORD *mr;
 179     HANDLETABLE16 *ht;
 180     HDC hdc = HDC_32(hdc16);
 181     HGLOBAL16 hHT;
 182     SEGPTR spht;
 183     unsigned int offset = 0;
 184     WORD i, seg;
 185     HPEN hPen;
 186     HBRUSH hBrush;
 187     HFONT hFont;
 188     WORD args[8];
 189     BOOL16 result = TRUE, loaded = FALSE;
 190
 191     TRACE("(%p, %04x, %p, %08lx)\n", hdc, hmf, lpEnumFunc, lpData);
 192
 193     if(!mh) return FALSE;
 194     if(mh->mtType == METAFILE_DISK) { /* Create a memory-based copy */
 195         mh = MF_LoadDiskBasedMetaFile(mh);
 196         if(!mh) return FALSE;
 197         loaded = TRUE;
 198     }
 199
 200     /* save the current pen, brush and font */
 201     hPen = GetCurrentObject(hdc, OBJ_PEN);
 202     hBrush = GetCurrentObject(hdc, OBJ_BRUSH);
 203     hFont = GetCurrentObject(hdc, OBJ_FONT);
 204
 205     /* create the handle table */
 206
 207     hHT = GlobalAlloc16(GMEM_MOVEABLE | GMEM_ZEROINIT,
 208                      sizeof(HANDLETABLE16) * mh->mtNoObjects);
 209     spht = WOWGlobalLock16(hHT);
 210
 211     seg = hmf | 7;
 212     offset = mh->mtHeaderSize * 2;
 213
 214     /* loop through metafile records */
 215
 216     args[7] = hdc16;
 217     args[6] = SELECTOROF(spht);
 218     args[5] = OFFSETOF(spht);
 219     args[4] = seg + (HIWORD(offset) << __AHSHIFT);
 220     args[3] = LOWORD(offset);
 221     args[2] = mh->mtNoObjects;
 222     args[1] = HIWORD(lpData);
 223     args[0] = LOWORD(lpData);
 224
 225     while (offset < (mh->mtSize * 2))
 226     {
 227         DWORD ret;
 228
 229         mr = (METARECORD *)((char *)mh + offset);
 230
 231         WOWCallback16Ex( (DWORD)lpEnumFunc, WCB16_PASCAL, sizeof(args), args, &ret );
 232         if (!LOWORD(ret))
 233         {
 234             result = FALSE;
 235             break;
 236         }
 237
 238         offset += (mr->rdSize * 2);
 239         args[4] = seg + (HIWORD(offset) << __AHSHIFT);
 240         args[3] = LOWORD(offset);
 241     }
 242
 243     SelectObject(hdc, hBrush);
 244     SelectObject(hdc, hPen);
 245     SelectObject(hdc, hFont);
 246
 247     ht = (HANDLETABLE16 *)GlobalLock16(hHT);
 248
 249     /* free objects in handle table */
 250     for(i = 0; i < mh->mtNoObjects; i++)
 251       if(*(ht->objectHandle + i) != 0)
 252         DeleteObject( (HGDIOBJ)(ULONG_PTR)(*(ht->objectHandle + i) ));
 253
 254     /* free handle table */
 255     GlobalFree16(hHT);
 256     if(loaded)
 257         HeapFree( GetProcessHeap(), 0, mh );
 258     MF_ReleaseMetaHeader16(hmf);
 259     return result;
 260 }
 261
 262 /******************************************************************
 263  *         GetMetaFileBits   (GDI.159)
 264  *
 265  * Trade in a metafile object handle for a handle to the metafile memory.
 266  *
 267  * PARAMS
 268  *  hmf [I] metafile handle
 269  */
 270
 271 HGLOBAL16 WINAPI GetMetaFileBits16( HMETAFILE16 hmf )
 272 {
 273     TRACE("hMem out: %04x\n", hmf);
 274     return hmf;
 275 }
 276
 277 /******************************************************************
 278  *         SetMetaFileBits   (GDI.160)
 279  *
 280  * Trade in a metafile memory handle for a handle to a metafile object.
 281  * The memory region should hold a proper metafile, otherwise
 282  * problems will occur when it is used. Validity of the memory is not
 283  * checked. The function is essentially just the identity function.
 284  *
 285  * PARAMS
 286  *  hMem [I] handle to a memory region holding a metafile
 287  *
 288  * RETURNS
 289  *  Handle to a metafile on success, NULL on failure..
 290  */
 291 HMETAFILE16 WINAPI SetMetaFileBits16( HGLOBAL16 hMem )
 292 {
 293     TRACE("hmf out: %04x\n", hMem);
 294
 295     return hMem;
 296 }
 297
 298 /******************************************************************
 299  *         SetMetaFileBitsBetter   (GDI.196)
 300  *
 301  * Trade in a metafile memory handle for a handle to a metafile object,
 302  * making a cursory check (using IsValidMetaFile()) that the memory
 303  * handle points to a valid metafile.
 304  *
 305  * RETURNS
 306  *  Handle to a metafile on success, NULL on failure..
 307  */
 308 HMETAFILE16 WINAPI SetMetaFileBitsBetter16( HMETAFILE16 hMeta )
 309 {
 310     if( IsValidMetaFile16( hMeta ) )
 311         return (HMETAFILE16)GlobalReAlloc16( hMeta, 0,
 312                            GMEM_SHARE | GMEM_NODISCARD | GMEM_MODIFY);
 313     return (HMETAFILE16)0;
 314 }
 315