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