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