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/dc.h"
  36 #include "wx/msw/dc.h"
  37
  38 #include "wx/metafile.h"
  39 #include "wx/clipbrd.h"
  40
  41 #include "wx/msw/private.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // wxWin macros
  45 // ----------------------------------------------------------------------------
  46
  47 IMPLEMENT_DYNAMIC_CLASS(wxEnhMetaFile, wxObject)
  48
  49 // ----------------------------------------------------------------------------
  50 // macros
  51 // ----------------------------------------------------------------------------
  52
  53 #define GetEMF()            ((HENHMETAFILE)m_hMF)
  54 #define GetEMFOf(mf)        ((HENHMETAFILE)((mf).m_hMF))
  55
  56 // ----------------------------------------------------------------------------
  57 // private functions
  58 // ----------------------------------------------------------------------------
  59
  60 // we must pass NULL if the string is empty to metafile functions
  61 static inline const wxChar *GetMetaFileName(const wxString& fn)
  62     { return !fn ? (const wxChar *)NULL : (const wxChar*)fn.wx_str(); }
  63
  64 // ============================================================================
  65 // implementation
  66 // ============================================================================
  67
  68 // ----------------------------------------------------------------------------
  69 // wxEnhMetaFile
  70 // ----------------------------------------------------------------------------
  71
  72 wxGDIRefData *wxEnhMetaFile::CreateGDIRefData() const
  73 {
  74     wxFAIL_MSG( wxT("must be implemented if used") );
  75
  76     return NULL;
  77 }
  78
  79 wxGDIRefData *
  80 wxEnhMetaFile::CloneGDIRefData(const wxGDIRefData *WXUNUSED(data)) const
  81 {
  82     wxFAIL_MSG( wxT("must be implemented if used") );
  83
  84     return NULL;
  85 }
  86
  87 void wxEnhMetaFile::Init()
  88 {
  89     if ( m_filename.empty() )
  90     {
  91         m_hMF = 0;
  92     }
  93     else // have valid file name, load metafile from it
  94     {
  95         m_hMF = (WXHANDLE)::GetEnhMetaFile(m_filename.t_str());
  96         if ( !m_hMF )
  97         {
  98             wxLogSysError(_("Failed to load metafile from file \"%s\"."),
  99                           m_filename.c_str());
 100         }
 101     }
 102 }
 103
 104 void wxEnhMetaFile::Assign(const wxEnhMetaFile& mf)
 105 {
 106     if ( &mf == this )
 107         return;
 108
 109     if ( mf.m_hMF )
 110     {
 111         m_hMF = (WXHANDLE)::CopyEnhMetaFile(GetEMFOf(mf),
 112                                             GetMetaFileName(m_filename));
 113         if ( !m_hMF )
 114         {
 115             wxLogLastError(wxT("CopyEnhMetaFile"));
 116         }
 117     }
 118     else
 119     {
 120         m_hMF = 0;
 121     }
 122 }
 123
 124 void wxEnhMetaFile::Free()
 125 {
 126     if ( m_hMF )
 127     {
 128         if ( !::DeleteEnhMetaFile(GetEMF()) )
 129         {
 130             wxLogLastError(wxT("DeleteEnhMetaFile"));
 131         }
 132     }
 133 }
 134
 135 bool wxEnhMetaFile::Play(wxDC *dc, wxRect *rectBound)
 136 {
 137     wxCHECK_MSG( IsOk(), false, wxT("can't play invalid enhanced metafile") );
 138     wxCHECK_MSG( dc, false, wxT("invalid wxDC in wxEnhMetaFile::Play") );
 139
 140     RECT rect;
 141     if ( rectBound )
 142     {
 143         rect.top = rectBound->y;
 144         rect.left = rectBound->x;
 145         rect.right = rectBound->x + rectBound->width;
 146         rect.bottom = rectBound->y + rectBound->height;
 147     }
 148     else
 149     {
 150         wxSize size = GetSize();
 151
 152         rect.top =
 153         rect.left = 0;
 154         rect.right = size.x;
 155         rect.bottom = size.y;
 156     }
 157
 158     wxDCImpl *impl = dc->GetImpl();
 159     wxMSWDCImpl *msw_impl = wxDynamicCast( impl, wxMSWDCImpl );
 160     if (!msw_impl)
 161         return false;
 162
 163     if ( !::PlayEnhMetaFile(GetHdcOf(*msw_impl), GetEMF(), &rect) )
 164     {
 165         wxLogLastError(wxT("PlayEnhMetaFile"));
 166
 167         return false;
 168     }
 169
 170     return true;
 171 }
 172
 173 wxSize wxEnhMetaFile::GetSize() const
 174 {
 175     wxSize size = wxDefaultSize;
 176
 177     if ( IsOk() )
 178     {
 179         ENHMETAHEADER hdr;
 180         if ( !::GetEnhMetaFileHeader(GetEMF(), sizeof(hdr), &hdr) )
 181         {
 182             wxLogLastError(wxT("GetEnhMetaFileHeader"));
 183         }
 184         else
 185         {
 186             // the width and height are in HIMETRIC (0.01mm) units, transform
 187             // them to pixels
 188             LONG w = hdr.rclFrame.right,
 189                  h = hdr.rclFrame.bottom;
 190
 191             HIMETRICToPixel(&w, &h);
 192
 193             size.x = w;
 194             size.y = h;
 195         }
 196     }
 197
 198     return size;
 199 }
 200
 201 bool wxEnhMetaFile::SetClipboard(int WXUNUSED(width), int WXUNUSED(height))
 202 {
 203 #if wxUSE_DRAG_AND_DROP && wxUSE_CLIPBOARD
 204     wxCHECK_MSG( m_hMF, false, wxT("can't copy invalid metafile to clipboard") );
 205
 206     return wxTheClipboard->AddData(new wxEnhMetaFileDataObject(*this));
 207 #else // !wxUSE_DRAG_AND_DROP
 208     wxFAIL_MSG(wxT("not implemented"));
 209     return false;
 210 #endif // wxUSE_DRAG_AND_DROP/!wxUSE_DRAG_AND_DROP
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // wxEnhMetaFileDCImpl
 215 // ----------------------------------------------------------------------------
 216
 217 class wxEnhMetaFileDCImpl : public wxMSWDCImpl
 218 {
 219 public:
 220     wxEnhMetaFileDCImpl( wxEnhMetaFileDC *owner,
 221                          const wxString& filename, int width, int height,
 222                          const wxString& description );
 223     wxEnhMetaFileDCImpl( wxEnhMetaFileDC *owner,
 224                          const wxDC& referenceDC,
 225                          const wxString& filename, int width, int height,
 226                          const wxString& description );
 227     virtual ~wxEnhMetaFileDCImpl();
 228
 229     // obtain a pointer to the new metafile (caller should delete it)
 230     wxEnhMetaFile *Close();
 231
 232 protected:
 233     virtual void DoGetSize(int *width, int *height) const;
 234
 235 private:
 236     void Create(HDC hdcRef,
 237                 const wxString& filename, int width, int height,
 238                 const wxString& description);
 239
 240     // size passed to ctor and returned by DoGetSize()
 241     int m_width,
 242         m_height;
 243 };
 244
 245
 246 wxEnhMetaFileDCImpl::wxEnhMetaFileDCImpl( wxEnhMetaFileDC* owner,
 247                                  const wxString& filename,
 248                                  int width, int height,
 249                                  const wxString& description )
 250                    : wxMSWDCImpl( owner )
 251 {
 252     Create(ScreenHDC(), filename, width, height, description);
 253 }
 254
 255 wxEnhMetaFileDCImpl::wxEnhMetaFileDCImpl( wxEnhMetaFileDC* owner,
 256                                  const wxDC& referenceDC,
 257                                  const wxString& filename,
 258                                  int width, int height,
 259                                  const wxString& description )
 260                    : wxMSWDCImpl( owner )
 261 {
 262     Create(GetHdcOf(referenceDC), filename, width, height, description);
 263 }
 264
 265 void wxEnhMetaFileDCImpl::Create(HDC hdcRef,
 266                                  const wxString& filename,
 267                                  int width, int height,
 268                                  const wxString& description)
 269 {
 270     m_width = width;
 271     m_height = height;
 272
 273     RECT rect;
 274     RECT *pRect;
 275     if ( width && height )
 276     {
 277         rect.top =
 278         rect.left = 0;
 279         rect.right = width;
 280         rect.bottom = height;
 281
 282         // CreateEnhMetaFile() wants them in HIMETRIC
 283         PixelToHIMETRIC(&rect.right, &rect.bottom, hdcRef);
 284
 285         pRect = &rect;
 286     }
 287     else
 288     {
 289         // GDI will try to find out the size for us (not recommended)
 290         pRect = (LPRECT)NULL;
 291     }
 292
 293     m_hDC = (WXHDC)::CreateEnhMetaFile(hdcRef, GetMetaFileName(filename),
 294                                        pRect, description.wx_str());
 295     if ( !m_hDC )
 296     {
 297         wxLogLastError(wxT("CreateEnhMetaFile"));
 298     }
 299 }
 300
 301 void wxEnhMetaFileDCImpl::DoGetSize(int *width, int *height) const
 302 {
 303     if ( width )
 304         *width = m_width;
 305     if ( height )
 306         *height = m_height;
 307 }
 308
 309 wxEnhMetaFile *wxEnhMetaFileDCImpl::Close()
 310 {
 311     wxCHECK_MSG( IsOk(), NULL, wxT("invalid wxEnhMetaFileDC") );
 312
 313     HENHMETAFILE hMF = ::CloseEnhMetaFile(GetHdc());
 314     if ( !hMF )
 315     {
 316         wxLogLastError(wxT("CloseEnhMetaFile"));
 317
 318         return NULL;
 319     }
 320
 321     wxEnhMetaFile *mf = new wxEnhMetaFile;
 322     mf->SetHENHMETAFILE((WXHANDLE)hMF);
 323     return mf;
 324 }
 325
 326 wxEnhMetaFileDCImpl::~wxEnhMetaFileDCImpl()
 327 {
 328     // avoid freeing it in the base class dtor
 329     m_hDC = 0;
 330 }
 331
 332 // ----------------------------------------------------------------------------
 333 // wxEnhMetaFileDC
 334 // ----------------------------------------------------------------------------
 335
 336 IMPLEMENT_ABSTRACT_CLASS(wxEnhMetaFileDC, wxDC)
 337
 338 wxEnhMetaFileDC::wxEnhMetaFileDC(const wxString& filename,
 339                                  int width, int height,
 340                                  const wxString& description)
 341                : wxDC(new wxEnhMetaFileDCImpl(this,
 342                                               filename,
 343                                               width, height,
 344                                               description))
 345 {
 346 }
 347
 348 wxEnhMetaFileDC::wxEnhMetaFileDC(const wxDC& referenceDC,
 349                                  const wxString& filename,
 350                                  int width, int height,
 351                                  const wxString& description)
 352                : wxDC(new wxEnhMetaFileDCImpl(this,
 353                                               referenceDC,
 354                                               filename,
 355                                               width, height,
 356                                               description))
 357 {
 358 }
 359
 360 wxEnhMetaFile *wxEnhMetaFileDC::Close()
 361 {
 362     wxEnhMetaFileDCImpl * const
 363         impl = static_cast<wxEnhMetaFileDCImpl *>(GetImpl());
 364     wxCHECK_MSG( impl, NULL, wxT("no wxEnhMetaFileDC implementation") );
 365
 366     return impl->Close();
 367 }
 368
 369 #if wxUSE_DRAG_AND_DROP
 370
 371 // ----------------------------------------------------------------------------
 372 // wxEnhMetaFileDataObject
 373 // ----------------------------------------------------------------------------
 374
 375 wxDataFormat
 376 wxEnhMetaFileDataObject::GetPreferredFormat(Direction WXUNUSED(dir)) const
 377 {
 378     return wxDF_ENHMETAFILE;
 379 }
 380
 381 size_t wxEnhMetaFileDataObject::GetFormatCount(Direction WXUNUSED(dir)) const
 382 {
 383     // wxDF_ENHMETAFILE and wxDF_METAFILE
 384     return 2;
 385 }
 386
 387 void wxEnhMetaFileDataObject::GetAllFormats(wxDataFormat *formats,
 388                                             Direction WXUNUSED(dir)) const
 389 {
 390     formats[0] = wxDF_ENHMETAFILE;
 391     formats[1] = wxDF_METAFILE;
 392 }
 393
 394 size_t wxEnhMetaFileDataObject::GetDataSize(const wxDataFormat& format) const
 395 {
 396     if ( format == wxDF_ENHMETAFILE )
 397     {
 398         // we pass data by handle and not HGLOBAL
 399         return 0u;
 400     }
 401     else
 402     {
 403         wxASSERT_MSG( format == wxDF_METAFILE, wxT("unsupported format") );
 404
 405         return sizeof(METAFILEPICT);
 406     }
 407 }
 408
 409 bool wxEnhMetaFileDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 410 {
 411     wxCHECK_MSG( m_metafile.IsOk(), false, wxT("copying invalid enh metafile") );
 412
 413     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 414
 415     if ( format == wxDF_ENHMETAFILE )
 416     {
 417         HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 418         if ( !hEMFCopy )
 419         {
 420             wxLogLastError(wxT("CopyEnhMetaFile"));
 421
 422             return false;
 423         }
 424
 425         *(HENHMETAFILE *)buf = hEMFCopy;
 426     }
 427     else
 428     {
 429         wxASSERT_MSG( format == wxDF_METAFILE, wxT("unsupported format") );
 430
 431         // convert to WMF
 432
 433         ScreenHDC hdc;
 434
 435         // first get the buffer size and alloc memory
 436         size_t size = ::GetWinMetaFileBits(hEMF, 0, NULL, MM_ANISOTROPIC, hdc);
 437         wxCHECK_MSG( size, false, wxT("GetWinMetaFileBits() failed") );
 438
 439         BYTE *bits = (BYTE *)malloc(size);
 440
 441         // then get the enh metafile bits
 442         if ( !::GetWinMetaFileBits(hEMF, size, bits, MM_ANISOTROPIC, hdc) )
 443         {
 444             wxLogLastError(wxT("GetWinMetaFileBits"));
 445
 446             free(bits);
 447
 448             return false;
 449         }
 450
 451         // and finally convert them to the WMF
 452         HMETAFILE hMF = ::SetMetaFileBitsEx(size, bits);
 453         free(bits);
 454         if ( !hMF )
 455         {
 456             wxLogLastError(wxT("SetMetaFileBitsEx"));
 457
 458             return false;
 459         }
 460
 461         METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 462
 463         wxSize sizeMF = m_metafile.GetSize();
 464         mfpict->hMF  = hMF;
 465         mfpict->mm   = MM_ANISOTROPIC;
 466         mfpict->xExt = sizeMF.x;
 467         mfpict->yExt = sizeMF.y;
 468
 469         PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 470     }
 471
 472     return true;
 473 }
 474
 475 bool wxEnhMetaFileDataObject::SetData(const wxDataFormat& format,
 476                                       size_t WXUNUSED(len),
 477                                       const void *buf)
 478 {
 479     HENHMETAFILE hEMF;
 480
 481     if ( format == wxDF_ENHMETAFILE )
 482     {
 483         hEMF = *(HENHMETAFILE *)buf;
 484
 485         wxCHECK_MSG( hEMF, false, wxT("pasting invalid enh metafile") );
 486     }
 487     else
 488     {
 489         wxASSERT_MSG( format == wxDF_METAFILE, wxT("unsupported format") );
 490
 491         // convert from WMF
 492         const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 493
 494         // first get the buffer size
 495         size_t size = ::GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 496         wxCHECK_MSG( size, false, wxT("GetMetaFileBitsEx() failed") );
 497
 498         // then get metafile bits
 499         BYTE *bits = (BYTE *)malloc(size);
 500         if ( !::GetMetaFileBitsEx(mfpict->hMF, size, bits) )
 501         {
 502             wxLogLastError(wxT("GetMetaFileBitsEx"));
 503
 504             free(bits);
 505
 506             return false;
 507         }
 508
 509         ScreenHDC hdcRef;
 510
 511         // and finally create an enhanced metafile from them
 512         hEMF = ::SetWinMetaFileBits(size, bits, hdcRef, mfpict);
 513         free(bits);
 514         if ( !hEMF )
 515         {
 516             wxLogLastError(wxT("SetWinMetaFileBits"));
 517
 518             return false;
 519         }
 520     }
 521
 522     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 523
 524     return true;
 525 }
 526
 527 // ----------------------------------------------------------------------------
 528 // wxEnhMetaFileSimpleDataObject
 529 // ----------------------------------------------------------------------------
 530
 531 size_t wxEnhMetaFileSimpleDataObject::GetDataSize() const
 532 {
 533     // we pass data by handle and not HGLOBAL
 534     return 0u;
 535 }
 536
 537 bool wxEnhMetaFileSimpleDataObject::GetDataHere(void *buf) const
 538 {
 539     wxCHECK_MSG( m_metafile.IsOk(), false, wxT("copying invalid enh metafile") );
 540
 541     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 542
 543     HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 544     if ( !hEMFCopy )
 545     {
 546         wxLogLastError(wxT("CopyEnhMetaFile"));
 547
 548         return false;
 549     }
 550
 551     *(HENHMETAFILE *)buf = hEMFCopy;
 552     return true;
 553 }
 554
 555 bool wxEnhMetaFileSimpleDataObject::SetData(size_t WXUNUSED(len),
 556                                             const void *buf)
 557 {
 558     HENHMETAFILE hEMF = *(HENHMETAFILE *)buf;
 559
 560     wxCHECK_MSG( hEMF, false, wxT("pasting invalid enh metafile") );
 561     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 562
 563     return true;
 564 }
 565
 566
 567 #endif // wxUSE_DRAG_AND_DROP
 568
 569 #endif // wxUSE_ENH_METAFILE