src/msw/enhmeta.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/enhmeta.cpp
   3 // Purpose:     implementation of wxEnhMetaFileXXX classes
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     13.01.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_ENH_METAFILE
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/string.h"
  31     #include "wx/log.h"
  32     #include "wx/intl.h"
  33 #endif //WX_PRECOMP
  34
  35 #include "wx/metafile.h"
  36 #include "wx/clipbrd.h"
  37
  38 #include "wx/msw/private.h"
  39
  40 // ----------------------------------------------------------------------------
  41 // wxWin macros
  42 // ----------------------------------------------------------------------------
  43
  44 IMPLEMENT_DYNAMIC_CLASS(wxEnhMetaFile, wxObject)
  45 IMPLEMENT_ABSTRACT_CLASS(wxEnhMetaFileDC, wxDC)
  46
  47 // ----------------------------------------------------------------------------
  48 // macros
  49 // ----------------------------------------------------------------------------
  50
  51 #define GetEMF()            ((HENHMETAFILE)m_hMF)
  52 #define GetEMFOf(mf)        ((HENHMETAFILE)((mf).m_hMF))
  53
  54 // ----------------------------------------------------------------------------
  55 // private functions
  56 // ----------------------------------------------------------------------------
  57
  58 // we must pass NULL if the string is empty to metafile functions
  59 static inline const wxChar *GetMetaFileName(const wxString& fn)
  60     { return !fn ? (const wxChar *)NULL : (const wxChar*)fn.c_str(); }
  61
  62 // ============================================================================
  63 // implementation
  64 // ============================================================================
  65
  66 // ----------------------------------------------------------------------------
  67 // wxEnhMetaFile
  68 // ----------------------------------------------------------------------------
  69
  70 void wxEnhMetaFile::Init()
  71 {
  72     if ( m_filename.empty() )
  73     {
  74         m_hMF = 0;
  75     }
  76     else // have valid file name, load metafile from it
  77     {
  78         m_hMF = (WXHANDLE)::GetEnhMetaFile(m_filename);
  79         if ( !m_hMF )
  80             wxLogSysError(_("Failed to load metafile from file \"%s\"."),
  81                           m_filename.c_str());
  82     }
  83 }
  84
  85 void wxEnhMetaFile::Assign(const wxEnhMetaFile& mf)
  86 {
  87     if ( &mf == this )
  88         return;
  89
  90     if ( mf.m_hMF )
  91     {
  92         m_hMF = (WXHANDLE)::CopyEnhMetaFile(GetEMFOf(mf),
  93                                             GetMetaFileName(m_filename));
  94         if ( !m_hMF )
  95         {
  96             wxLogLastError(_T("CopyEnhMetaFile"));
  97         }
  98     }
  99     else
 100     {
 101         m_hMF = 0;
 102     }
 103 }
 104
 105 void wxEnhMetaFile::Free()
 106 {
 107     if ( m_hMF )
 108     {
 109         if ( !::DeleteEnhMetaFile(GetEMF()) )
 110         {
 111             wxLogLastError(_T("DeleteEnhMetaFile"));
 112         }
 113     }
 114 }
 115
 116 bool wxEnhMetaFile::Play(wxDC *dc, wxRect *rectBound)
 117 {
 118     wxCHECK_MSG( Ok(), false, _T("can't play invalid enhanced metafile") );
 119     wxCHECK_MSG( dc, false, _T("invalid wxDC in wxEnhMetaFile::Play") );
 120
 121     RECT rect;
 122     if ( rectBound )
 123     {
 124         rect.top = rectBound->y;
 125         rect.left = rectBound->x;
 126         rect.right = rectBound->x + rectBound->width;
 127         rect.bottom = rectBound->y + rectBound->height;
 128     }
 129     else
 130     {
 131         wxSize size = GetSize();
 132
 133         rect.top =
 134         rect.left = 0;
 135         rect.right = size.x;
 136         rect.bottom = size.y;
 137     }
 138
 139     if ( !::PlayEnhMetaFile(GetHdcOf(*dc), GetEMF(), &rect) )
 140     {
 141         wxLogLastError(_T("PlayEnhMetaFile"));
 142
 143         return false;
 144     }
 145
 146     return true;
 147 }
 148
 149 wxSize wxEnhMetaFile::GetSize() const
 150 {
 151     wxSize size = wxDefaultSize;
 152
 153     if ( Ok() )
 154     {
 155         ENHMETAHEADER hdr;
 156         if ( !::GetEnhMetaFileHeader(GetEMF(), sizeof(hdr), &hdr) )
 157         {
 158             wxLogLastError(_T("GetEnhMetaFileHeader"));
 159         }
 160         else
 161         {
 162             // the width and height are in HIMETRIC (0.01mm) units, transform
 163             // them to pixels
 164             LONG w = hdr.rclFrame.right,
 165                  h = hdr.rclFrame.bottom;
 166
 167             HIMETRICToPixel(&w, &h);
 168
 169             size.x = w;
 170             size.y = h;
 171         }
 172     }
 173
 174     return size;
 175 }
 176
 177 bool wxEnhMetaFile::SetClipboard(int WXUNUSED(width), int WXUNUSED(height))
 178 {
 179 #if wxUSE_DRAG_AND_DROP && wxUSE_CLIPBOARD
 180     wxCHECK_MSG( m_hMF, false, _T("can't copy invalid metafile to clipboard") );
 181
 182     return wxTheClipboard->AddData(new wxEnhMetaFileDataObject(*this));
 183 #else // !wxUSE_DRAG_AND_DROP
 184     wxFAIL_MSG(_T("not implemented"));
 185     return false;
 186 #endif // wxUSE_DRAG_AND_DROP/!wxUSE_DRAG_AND_DROP
 187 }
 188
 189 // ----------------------------------------------------------------------------
 190 // wxEnhMetaFileDC
 191 // ----------------------------------------------------------------------------
 192
 193 wxEnhMetaFileDC::wxEnhMetaFileDC(const wxString& filename,
 194                                  int width, int height,
 195                                  const wxString& description)
 196 {
 197     m_width = width;
 198     m_height = height;
 199
 200     RECT rect;
 201     RECT *pRect;
 202     if ( width && height )
 203     {
 204         rect.top =
 205         rect.left = 0;
 206         rect.right = width;
 207         rect.bottom = height;
 208
 209         // CreateEnhMetaFile() wants them in HIMETRIC
 210         PixelToHIMETRIC(&rect.right, &rect.bottom);
 211
 212         pRect = &rect;
 213     }
 214     else
 215     {
 216         // GDI will try to find out the size for us (not recommended)
 217         pRect = (LPRECT)NULL;
 218     }
 219
 220     ScreenHDC hdcRef;
 221     m_hDC = (WXHDC)::CreateEnhMetaFile(hdcRef, GetMetaFileName(filename),
 222                                        pRect, description);
 223     if ( !m_hDC )
 224     {
 225         wxLogLastError(_T("CreateEnhMetaFile"));
 226     }
 227 }
 228
 229 void wxEnhMetaFileDC::DoGetSize(int *width, int *height) const
 230 {
 231     if ( width )
 232         *width = m_width;
 233     if ( height )
 234         *height = m_height;
 235 }
 236
 237 wxEnhMetaFile *wxEnhMetaFileDC::Close()
 238 {
 239     wxCHECK_MSG( Ok(), NULL, _T("invalid wxEnhMetaFileDC") );
 240
 241     HENHMETAFILE hMF = ::CloseEnhMetaFile(GetHdc());
 242     if ( !hMF )
 243     {
 244         wxLogLastError(_T("CloseEnhMetaFile"));
 245
 246         return NULL;
 247     }
 248
 249     wxEnhMetaFile *mf = new wxEnhMetaFile;
 250     mf->SetHENHMETAFILE((WXHANDLE)hMF);
 251     return mf;
 252 }
 253
 254 wxEnhMetaFileDC::~wxEnhMetaFileDC()
 255 {
 256     // avoid freeing it in the base class dtor
 257     m_hDC = 0;
 258 }
 259
 260 #if wxUSE_DRAG_AND_DROP
 261
 262 // ----------------------------------------------------------------------------
 263 // wxEnhMetaFileDataObject
 264 // ----------------------------------------------------------------------------
 265
 266 wxDataFormat
 267 wxEnhMetaFileDataObject::GetPreferredFormat(Direction WXUNUSED(dir)) const
 268 {
 269     return wxDF_ENHMETAFILE;
 270 }
 271
 272 size_t wxEnhMetaFileDataObject::GetFormatCount(Direction WXUNUSED(dir)) const
 273 {
 274     // wxDF_ENHMETAFILE and wxDF_METAFILE
 275     return 2;
 276 }
 277
 278 void wxEnhMetaFileDataObject::GetAllFormats(wxDataFormat *formats,
 279                                             Direction WXUNUSED(dir)) const
 280 {
 281     formats[0] = wxDF_ENHMETAFILE;
 282     formats[1] = wxDF_METAFILE;
 283 }
 284
 285 size_t wxEnhMetaFileDataObject::GetDataSize(const wxDataFormat& format) const
 286 {
 287     if ( format == wxDF_ENHMETAFILE )
 288     {
 289         // we pass data by handle and not HGLOBAL
 290         return 0u;
 291     }
 292     else
 293     {
 294         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 295
 296         return sizeof(METAFILEPICT);
 297     }
 298 }
 299
 300 bool wxEnhMetaFileDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 301 {
 302     wxCHECK_MSG( m_metafile.Ok(), false, _T("copying invalid enh metafile") );
 303
 304     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 305
 306     if ( format == wxDF_ENHMETAFILE )
 307     {
 308         HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 309         if ( !hEMFCopy )
 310         {
 311             wxLogLastError(_T("CopyEnhMetaFile"));
 312
 313             return false;
 314         }
 315
 316         *(HENHMETAFILE *)buf = hEMFCopy;
 317     }
 318     else
 319     {
 320         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 321
 322         // convert to WMF
 323
 324         ScreenHDC hdc;
 325
 326         // first get the buffer size and alloc memory
 327         size_t size = ::GetWinMetaFileBits(hEMF, 0, NULL, MM_ANISOTROPIC, hdc);
 328         wxCHECK_MSG( size, false, _T("GetWinMetaFileBits() failed") );
 329
 330         BYTE *bits = (BYTE *)malloc(size);
 331
 332         // then get the enh metafile bits
 333         if ( !::GetWinMetaFileBits(hEMF, size, bits, MM_ANISOTROPIC, hdc) )
 334         {
 335             wxLogLastError(_T("GetWinMetaFileBits"));
 336
 337             free(bits);
 338
 339             return false;
 340         }
 341
 342         // and finally convert them to the WMF
 343         HMETAFILE hMF = ::SetMetaFileBitsEx(size, bits);
 344         free(bits);
 345         if ( !hMF )
 346         {
 347             wxLogLastError(_T("SetMetaFileBitsEx"));
 348
 349             return false;
 350         }
 351
 352         METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 353
 354         wxSize sizeMF = m_metafile.GetSize();
 355         mfpict->hMF  = hMF;
 356         mfpict->mm   = MM_ANISOTROPIC;
 357         mfpict->xExt = sizeMF.x;
 358         mfpict->yExt = sizeMF.y;
 359
 360         PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 361     }
 362
 363     return true;
 364 }
 365
 366 bool wxEnhMetaFileDataObject::SetData(const wxDataFormat& format,
 367                                       size_t WXUNUSED(len),
 368                                       const void *buf)
 369 {
 370     HENHMETAFILE hEMF;
 371
 372     if ( format == wxDF_ENHMETAFILE )
 373     {
 374         hEMF = *(HENHMETAFILE *)buf;
 375
 376         wxCHECK_MSG( hEMF, false, _T("pasting invalid enh metafile") );
 377     }
 378     else
 379     {
 380         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 381
 382         // convert from WMF
 383         const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 384
 385         // first get the buffer size
 386         size_t size = ::GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 387         wxCHECK_MSG( size, false, _T("GetMetaFileBitsEx() failed") );
 388
 389         // then get metafile bits
 390         BYTE *bits = (BYTE *)malloc(size);
 391         if ( !::GetMetaFileBitsEx(mfpict->hMF, size, bits) )
 392         {
 393             wxLogLastError(_T("GetMetaFileBitsEx"));
 394
 395             free(bits);
 396
 397             return false;
 398         }
 399
 400         ScreenHDC hdcRef;
 401
 402         // and finally create an enhanced metafile from them
 403         hEMF = ::SetWinMetaFileBits(size, bits, hdcRef, mfpict);
 404         free(bits);
 405         if ( !hEMF )
 406         {
 407             wxLogLastError(_T("SetWinMetaFileBits"));
 408
 409             return false;
 410         }
 411     }
 412
 413     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 414
 415     return true;
 416 }
 417
 418 // ----------------------------------------------------------------------------
 419 // wxEnhMetaFileSimpleDataObject
 420 // ----------------------------------------------------------------------------
 421
 422 size_t wxEnhMetaFileSimpleDataObject::GetDataSize() const
 423 {
 424     // we pass data by handle and not HGLOBAL
 425     return 0u;
 426 }
 427
 428 bool wxEnhMetaFileSimpleDataObject::GetDataHere(void *buf) const
 429 {
 430     wxCHECK_MSG( m_metafile.Ok(), false, _T("copying invalid enh metafile") );
 431
 432     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 433
 434     HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 435     if ( !hEMFCopy )
 436     {
 437         wxLogLastError(_T("CopyEnhMetaFile"));
 438
 439         return false;
 440     }
 441
 442     *(HENHMETAFILE *)buf = hEMFCopy;
 443     return true;
 444 }
 445
 446 bool wxEnhMetaFileSimpleDataObject::SetData(size_t WXUNUSED(len),
 447                                             const void *buf)
 448 {
 449     HENHMETAFILE hEMF = *(HENHMETAFILE *)buf;
 450
 451     wxCHECK_MSG( hEMF, false, _T("pasting invalid enh metafile") );
 452     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 453
 454     return true;
 455 }
 456
 457
 458 #endif // wxUSE_DRAG_AND_DROP
 459
 460 #endif // wxUSE_ENH_METAFILE