src/msw/enhmeta.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 ? (wxChar *)NULL : 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 = 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     ScreenHDC hdcRef;
 198     RECT rect;
 199     RECT *pRect;
 200     if ( width && height )
 201     {
 202         rect.top =
 203         rect.left = 0;
 204         rect.right = width;
 205         rect.bottom = height;
 206
 207         // CreateEnhMetaFile() wants them in HIMETRIC
 208         PixelToHIMETRIC(&rect.right, &rect.bottom);
 209
 210         pRect = &rect;
 211     }
 212     else
 213     {
 214         // GDI will try to find out the size for us (not recommended)
 215         pRect = (LPRECT)NULL;
 216     }
 217
 218     m_hDC = (WXHDC)::CreateEnhMetaFile(hdcRef, GetMetaFileName(filename),
 219                                        pRect, description);
 220     if ( !m_hDC )
 221     {
 222         wxLogLastError(_T("CreateEnhMetaFile"));
 223     }
 224 }
 225
 226 wxEnhMetaFile *wxEnhMetaFileDC::Close()
 227 {
 228     wxCHECK_MSG( Ok(), NULL, _T("invalid wxEnhMetaFileDC") );
 229
 230     HENHMETAFILE hMF = ::CloseEnhMetaFile(GetHdc());
 231     if ( !hMF )
 232     {
 233         wxLogLastError(_T("CloseEnhMetaFile"));
 234
 235         return NULL;
 236     }
 237
 238     wxEnhMetaFile *mf = new wxEnhMetaFile;
 239     mf->SetHENHMETAFILE((WXHANDLE)hMF);
 240     return mf;
 241 }
 242
 243 wxEnhMetaFileDC::~wxEnhMetaFileDC()
 244 {
 245     // avoid freeing it in the base class dtor
 246     m_hDC = 0;
 247 }
 248
 249 #if wxUSE_DRAG_AND_DROP
 250
 251 // ----------------------------------------------------------------------------
 252 // wxEnhMetaFileDataObject
 253 // ----------------------------------------------------------------------------
 254
 255 wxDataFormat
 256 wxEnhMetaFileDataObject::GetPreferredFormat(Direction WXUNUSED(dir)) const
 257 {
 258     return wxDF_ENHMETAFILE;
 259 }
 260
 261 size_t wxEnhMetaFileDataObject::GetFormatCount(Direction WXUNUSED(dir)) const
 262 {
 263     // wxDF_ENHMETAFILE and wxDF_METAFILE
 264     return 2;
 265 }
 266
 267 void wxEnhMetaFileDataObject::GetAllFormats(wxDataFormat *formats,
 268                                             Direction WXUNUSED(dir)) const
 269 {
 270     formats[0] = wxDF_ENHMETAFILE;
 271     formats[1] = wxDF_METAFILE;
 272 }
 273
 274 size_t wxEnhMetaFileDataObject::GetDataSize(const wxDataFormat& format) const
 275 {
 276     if ( format == wxDF_ENHMETAFILE )
 277     {
 278         // we pass data by handle and not HGLOBAL
 279         return 0u;
 280     }
 281     else
 282     {
 283         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 284
 285         return sizeof(METAFILEPICT);
 286     }
 287 }
 288
 289 bool wxEnhMetaFileDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 290 {
 291     wxCHECK_MSG( m_metafile.Ok(), false, _T("copying invalid enh metafile") );
 292
 293     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 294
 295     if ( format == wxDF_ENHMETAFILE )
 296     {
 297         HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 298         if ( !hEMFCopy )
 299         {
 300             wxLogLastError(_T("CopyEnhMetaFile"));
 301
 302             return false;
 303         }
 304
 305         *(HENHMETAFILE *)buf = hEMFCopy;
 306     }
 307     else
 308     {
 309         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 310
 311         // convert to WMF
 312
 313         ScreenHDC hdc;
 314
 315         // first get the buffer size and alloc memory
 316         size_t size = ::GetWinMetaFileBits(hEMF, 0, NULL, MM_ANISOTROPIC, hdc);
 317         wxCHECK_MSG( size, false, _T("GetWinMetaFileBits() failed") );
 318
 319         BYTE *bits = (BYTE *)malloc(size);
 320
 321         // then get the enh metafile bits
 322         if ( !::GetWinMetaFileBits(hEMF, size, bits, MM_ANISOTROPIC, hdc) )
 323         {
 324             wxLogLastError(_T("GetWinMetaFileBits"));
 325
 326             free(bits);
 327
 328             return false;
 329         }
 330
 331         // and finally convert them to the WMF
 332         HMETAFILE hMF = ::SetMetaFileBitsEx(size, bits);
 333         free(bits);
 334         if ( !hMF )
 335         {
 336             wxLogLastError(_T("SetMetaFileBitsEx"));
 337
 338             return false;
 339         }
 340
 341         METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 342
 343         wxSize sizeMF = m_metafile.GetSize();
 344         mfpict->hMF  = hMF;
 345         mfpict->mm   = MM_ANISOTROPIC;
 346         mfpict->xExt = sizeMF.x;
 347         mfpict->yExt = sizeMF.y;
 348
 349         PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 350     }
 351
 352     return true;
 353 }
 354
 355 bool wxEnhMetaFileDataObject::SetData(const wxDataFormat& format,
 356                                       size_t WXUNUSED(len),
 357                                       const void *buf)
 358 {
 359     HENHMETAFILE hEMF;
 360
 361     if ( format == wxDF_ENHMETAFILE )
 362     {
 363         hEMF = *(HENHMETAFILE *)buf;
 364
 365         wxCHECK_MSG( hEMF, false, _T("pasting invalid enh metafile") );
 366     }
 367     else
 368     {
 369         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 370
 371         // convert from WMF
 372         const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 373
 374         // first get the buffer size
 375         size_t size = ::GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 376         wxCHECK_MSG( size, false, _T("GetMetaFileBitsEx() failed") );
 377
 378         // then get metafile bits
 379         BYTE *bits = (BYTE *)malloc(size);
 380         if ( !::GetMetaFileBitsEx(mfpict->hMF, size, bits) )
 381         {
 382             wxLogLastError(_T("GetMetaFileBitsEx"));
 383
 384             free(bits);
 385
 386             return false;
 387         }
 388
 389         ScreenHDC hdcRef;
 390
 391         // and finally create an enhanced metafile from them
 392         hEMF = ::SetWinMetaFileBits(size, bits, hdcRef, mfpict);
 393         free(bits);
 394         if ( !hEMF )
 395         {
 396             wxLogLastError(_T("SetWinMetaFileBits"));
 397
 398             return false;
 399         }
 400     }
 401
 402     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 403
 404     return true;
 405 }
 406
 407 // ----------------------------------------------------------------------------
 408 // wxEnhMetaFileSimpleDataObject
 409 // ----------------------------------------------------------------------------
 410
 411 size_t wxEnhMetaFileSimpleDataObject::GetDataSize() const
 412 {
 413     // we pass data by handle and not HGLOBAL
 414     return 0u;
 415 }
 416
 417 bool wxEnhMetaFileSimpleDataObject::GetDataHere(void *buf) const
 418 {
 419     wxCHECK_MSG( m_metafile.Ok(), false, _T("copying invalid enh metafile") );
 420
 421     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 422
 423     HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 424     if ( !hEMFCopy )
 425     {
 426         wxLogLastError(_T("CopyEnhMetaFile"));
 427
 428         return false;
 429     }
 430
 431     *(HENHMETAFILE *)buf = hEMFCopy;
 432     return true;
 433 }
 434
 435 bool wxEnhMetaFileSimpleDataObject::SetData(size_t WXUNUSED(len),
 436                                             const void *buf)
 437 {
 438     HENHMETAFILE hEMF = *(HENHMETAFILE *)buf;
 439
 440     wxCHECK_MSG( hEMF, false, _T("pasting invalid enh metafile") );
 441     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 442
 443     return true;
 444 }
 445
 446
 447 #endif // wxUSE_DRAG_AND_DROP
 448
 449 #endif // wxUSE_ENH_METAFILE