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 license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  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 #endif //WX_PRECOMP
  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 IMPLEMENT_ABSTRACT_CLASS(wxEnhMetaFileDC, wxDC)
  49
  50 // ----------------------------------------------------------------------------
  51 // macros
  52 // ----------------------------------------------------------------------------
  53
  54 #define GetEMF()            ((HENHMETAFILE)m_hMF)
  55 #define GetEMFOf(mf)        ((HENHMETAFILE)((mf).m_hMF))
  56
  57 // ----------------------------------------------------------------------------
  58 // private functions
  59 // ----------------------------------------------------------------------------
  60
  61 // we must pass NULL if the string is empty to metafile functions
  62 static inline const wxChar *GetMetaFileName(const wxString& fn)
  63     { return !fn ? (wxChar *)NULL : fn.c_str(); }
  64
  65 // ============================================================================
  66 // implementation
  67 // ============================================================================
  68
  69 // ----------------------------------------------------------------------------
  70 // wxEnhMetaFile
  71 // ----------------------------------------------------------------------------
  72
  73 void wxEnhMetaFile::Assign(const wxEnhMetaFile& mf)
  74 {
  75     if ( &mf == this )
  76         return;
  77
  78     if ( mf.m_hMF )
  79     {
  80         m_hMF = (WXHANDLE)::CopyEnhMetaFile(GetEMFOf(mf),
  81                                             GetMetaFileName(m_filename));
  82         if ( !m_hMF )
  83         {
  84             wxLogLastError(_T("CopyEnhMetaFile"));
  85         }
  86     }
  87     else
  88     {
  89         m_hMF = 0;
  90     }
  91 }
  92
  93 void wxEnhMetaFile::Free()
  94 {
  95     if ( m_hMF )
  96     {
  97         if ( !::DeleteEnhMetaFile(GetEMF()) )
  98         {
  99             wxLogLastError(_T("DeleteEnhMetaFile"));
 100         }
 101     }
 102 }
 103
 104 bool wxEnhMetaFile::Play(wxDC *dc, wxRect *rectBound)
 105 {
 106     wxCHECK_MSG( Ok(), FALSE, _T("can't play invalid enhanced metafile") );
 107     wxCHECK_MSG( dc, FALSE, _T("invalid wxDC in wxEnhMetaFile::Play") );
 108
 109     RECT rect;
 110     if ( rectBound )
 111     {
 112         rect.top = rectBound->y;
 113         rect.left = rectBound->x;
 114         rect.right = rectBound->x + rectBound->width;
 115         rect.bottom = rectBound->y + rectBound->height;
 116     }
 117     else
 118     {
 119         wxSize size = GetSize();
 120
 121         rect.top =
 122         rect.left = 0;
 123         rect.right = size.x;
 124         rect.bottom = size.y;
 125     }
 126
 127     if ( !::PlayEnhMetaFile(GetHdcOf(*dc), GetEMF(), &rect) )
 128     {
 129         wxLogLastError(_T("PlayEnhMetaFile"));
 130
 131         return FALSE;
 132     }
 133
 134     return TRUE;
 135 }
 136
 137 wxSize wxEnhMetaFile::GetSize() const
 138 {
 139     wxSize size = wxDefaultSize;
 140
 141     if ( Ok() )
 142     {
 143         ENHMETAHEADER hdr;
 144         if ( !::GetEnhMetaFileHeader(GetEMF(), sizeof(hdr), &hdr) )
 145         {
 146             wxLogLastError(_T("GetEnhMetaFileHeader"));
 147         }
 148         else
 149         {
 150             // the width and height are in HIMETRIC (0.01mm) units, transform
 151             // them to pixels
 152             LONG w = hdr.rclFrame.right,
 153                  h = hdr.rclFrame.bottom;
 154
 155             HIMETRICToPixel(&w, &h);
 156
 157             size.x = w;
 158             size.y = h;
 159         }
 160     }
 161
 162     return size;
 163 }
 164
 165 bool wxEnhMetaFile::SetClipboard(int WXUNUSED(width), int WXUNUSED(height))
 166 {
 167     wxCHECK_MSG( m_hMF, FALSE, _T("can't copy invalid metafile to clipboard") );
 168
 169     return wxTheClipboard->AddData(new wxEnhMetaFileDataObject(*this));
 170 }
 171
 172 // ----------------------------------------------------------------------------
 173 // wxEnhMetaFileDC
 174 // ----------------------------------------------------------------------------
 175
 176 wxEnhMetaFileDC::wxEnhMetaFileDC(const wxString& filename,
 177                                  int width, int height,
 178                                  const wxString& description)
 179 {
 180     ScreenHDC hdcRef;
 181
 182     RECT rect, *pRect;
 183     if ( width && height )
 184     {
 185         rect.top =
 186         rect.left = 0;
 187         rect.right = width;
 188         rect.bottom = height;
 189
 190         // CreateEnhMetaFile() wants them in HIMETRIC
 191         PixelToHIMETRIC(&rect.right, &rect.bottom);
 192
 193         pRect = &rect;
 194     }
 195     else
 196     {
 197         // GDI will try to find out the size for us (not recommended)
 198         pRect = (LPRECT)NULL;
 199     }
 200
 201     m_hDC = (WXHDC)::CreateEnhMetaFile(hdcRef, GetMetaFileName(filename),
 202                                        pRect, description);
 203     if ( !m_hDC )
 204     {
 205         wxLogLastError(_T("CreateEnhMetaFile"));
 206     }
 207 }
 208
 209 wxEnhMetaFile *wxEnhMetaFileDC::Close()
 210 {
 211     wxCHECK_MSG( Ok(), NULL, _T("invalid wxEnhMetaFileDC") );
 212
 213     HENHMETAFILE hMF = ::CloseEnhMetaFile(GetHdc());
 214     if ( !hMF )
 215     {
 216         wxLogLastError(_T("CloseEnhMetaFile"));
 217
 218         return NULL;
 219     }
 220
 221     wxEnhMetaFile *mf = new wxEnhMetaFile;
 222     mf->SetHENHMETAFILE((WXHANDLE)hMF);
 223     return mf;
 224 }
 225
 226 wxEnhMetaFileDC::~wxEnhMetaFileDC()
 227 {
 228     // avoid freeing it in the base class dtor
 229     m_hDC = 0;
 230 }
 231
 232 // ----------------------------------------------------------------------------
 233 // wxEnhMetaFileDataObject
 234 // ----------------------------------------------------------------------------
 235
 236 #if wxUSE_DRAG_AND_DROP
 237
 238 wxDataFormat
 239 wxEnhMetaFileDataObject::GetPreferredFormat(Direction WXUNUSED(dir)) const
 240 {
 241     return wxDF_ENHMETAFILE;
 242 }
 243
 244 size_t wxEnhMetaFileDataObject::GetFormatCount(Direction WXUNUSED(dir)) const
 245 {
 246     // wxDF_ENHMETAFILE and wxDF_METAFILE
 247     return 2;
 248 }
 249
 250 void wxEnhMetaFileDataObject::GetAllFormats(wxDataFormat *formats,
 251                                             Direction WXUNUSED(dir)) const
 252 {
 253     formats[0] = wxDF_ENHMETAFILE;
 254     formats[1] = wxDF_METAFILE;
 255 }
 256
 257 size_t wxEnhMetaFileDataObject::GetDataSize(const wxDataFormat& format) const
 258 {
 259     if ( format == wxDF_ENHMETAFILE )
 260     {
 261         // we pass data by handle and not HGLOBAL
 262         return 0u;
 263     }
 264     else
 265     {
 266         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 267
 268         return sizeof(METAFILEPICT);
 269     }
 270 }
 271
 272 bool wxEnhMetaFileDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 273 {
 274     wxCHECK_MSG( m_metafile.Ok(), FALSE, _T("copying invalid enh metafile") );
 275
 276     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 277
 278     if ( format == wxDF_ENHMETAFILE )
 279     {
 280         HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 281         if ( !hEMFCopy )
 282         {
 283             wxLogLastError(_T("CopyEnhMetaFile"));
 284
 285             return FALSE;
 286         }
 287
 288         *(HENHMETAFILE *)buf = hEMFCopy;
 289     }
 290     else
 291     {
 292         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 293
 294         // convert to WMF
 295
 296         ScreenHDC hdc;
 297
 298         // first get the buffer size and alloc memory
 299         size_t size = ::GetWinMetaFileBits(hEMF, 0, NULL, MM_ANISOTROPIC, hdc);
 300         wxCHECK_MSG( size, FALSE, _T("GetWinMetaFileBits() failed") );
 301
 302         BYTE *bits = (BYTE *)malloc(size);
 303
 304         // then get the enh metafile bits
 305         if ( !::GetWinMetaFileBits(hEMF, size, bits, MM_ANISOTROPIC, hdc) )
 306         {
 307             wxLogLastError(_T("GetWinMetaFileBits"));
 308
 309             free(bits);
 310
 311             return FALSE;
 312         }
 313
 314         // and finally convert them to the WMF
 315         HMETAFILE hMF = ::SetMetaFileBitsEx(size, bits);
 316         free(bits);
 317         if ( !hMF )
 318         {
 319             wxLogLastError(_T("SetMetaFileBitsEx"));
 320
 321             return FALSE;
 322         }
 323
 324         METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 325
 326         wxSize sizeMF = m_metafile.GetSize();
 327         mfpict->hMF  = hMF;
 328         mfpict->mm   = MM_ANISOTROPIC;
 329         mfpict->xExt = sizeMF.x;
 330         mfpict->yExt = sizeMF.y;
 331
 332         PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 333     }
 334
 335     return TRUE;
 336 }
 337
 338 bool wxEnhMetaFileDataObject::SetData(const wxDataFormat& format,
 339                                       size_t WXUNUSED(len),
 340                                       const void *buf)
 341 {
 342     HENHMETAFILE hEMF;
 343
 344     if ( format == wxDF_ENHMETAFILE )
 345     {
 346         hEMF = *(HENHMETAFILE *)buf;
 347
 348         wxCHECK_MSG( hEMF, FALSE, _T("pasting invalid enh metafile") );
 349     }
 350     else
 351     {
 352         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 353
 354         // convert from WMF
 355         const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 356
 357         // first get the buffer size
 358         size_t size = ::GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 359         wxCHECK_MSG( size, FALSE, _T("GetMetaFileBitsEx() failed") );
 360
 361         // then get metafile bits
 362         BYTE *bits = (BYTE *)malloc(size);
 363         if ( !::GetMetaFileBitsEx(mfpict->hMF, size, bits) )
 364         {
 365             wxLogLastError(_T("GetMetaFileBitsEx"));
 366
 367             free(bits);
 368
 369             return FALSE;
 370         }
 371
 372         ScreenHDC hdcRef;
 373
 374         // and finally create an enhanced metafile from them
 375         hEMF = ::SetWinMetaFileBits(size, bits, hdcRef, mfpict);
 376         free(bits);
 377         if ( !hEMF )
 378         {
 379             wxLogLastError(_T("SetWinMetaFileBits"));
 380
 381             return FALSE;
 382         }
 383     }
 384
 385     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 386
 387     return TRUE;
 388 }
 389 #endif // wxUSE_DRAG_AND_DROP
 390
 391 #endif // wxUSE_ENH_METAFILE