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 #if wxUSE_DRAG_AND_DROP
 168     wxCHECK_MSG( m_hMF, FALSE, _T("can't copy invalid metafile to clipboard") );
 169
 170     return wxTheClipboard->AddData(new wxEnhMetaFileDataObject(*this));
 171 #else // !wxUSE_DRAG_AND_DROP
 172     wxFAIL_MSG(_T("not implemented"));
 173     return FALSE;
 174 #endif // wxUSE_DRAG_AND_DROP/!wxUSE_DRAG_AND_DROP
 175 }
 176
 177 // ----------------------------------------------------------------------------
 178 // wxEnhMetaFileDC
 179 // ----------------------------------------------------------------------------
 180
 181 wxEnhMetaFileDC::wxEnhMetaFileDC(const wxString& filename,
 182                                  int width, int height,
 183                                  const wxString& description)
 184 {
 185     ScreenHDC hdcRef;
 186
 187     RECT rect, *pRect;
 188     if ( width && height )
 189     {
 190         rect.top =
 191         rect.left = 0;
 192         rect.right = width;
 193         rect.bottom = height;
 194
 195         // CreateEnhMetaFile() wants them in HIMETRIC
 196         PixelToHIMETRIC(&rect.right, &rect.bottom);
 197
 198         pRect = &rect;
 199     }
 200     else
 201     {
 202         // GDI will try to find out the size for us (not recommended)
 203         pRect = (LPRECT)NULL;
 204     }
 205
 206     m_hDC = (WXHDC)::CreateEnhMetaFile(hdcRef, GetMetaFileName(filename),
 207                                        pRect, description);
 208     if ( !m_hDC )
 209     {
 210         wxLogLastError(_T("CreateEnhMetaFile"));
 211     }
 212 }
 213
 214 wxEnhMetaFile *wxEnhMetaFileDC::Close()
 215 {
 216     wxCHECK_MSG( Ok(), NULL, _T("invalid wxEnhMetaFileDC") );
 217
 218     HENHMETAFILE hMF = ::CloseEnhMetaFile(GetHdc());
 219     if ( !hMF )
 220     {
 221         wxLogLastError(_T("CloseEnhMetaFile"));
 222
 223         return NULL;
 224     }
 225
 226     wxEnhMetaFile *mf = new wxEnhMetaFile;
 227     mf->SetHENHMETAFILE((WXHANDLE)hMF);
 228     return mf;
 229 }
 230
 231 wxEnhMetaFileDC::~wxEnhMetaFileDC()
 232 {
 233     // avoid freeing it in the base class dtor
 234     m_hDC = 0;
 235 }
 236
 237 // ----------------------------------------------------------------------------
 238 // wxEnhMetaFileDataObject
 239 // ----------------------------------------------------------------------------
 240
 241 #if wxUSE_DRAG_AND_DROP
 242
 243 wxDataFormat
 244 wxEnhMetaFileDataObject::GetPreferredFormat(Direction WXUNUSED(dir)) const
 245 {
 246     return wxDF_ENHMETAFILE;
 247 }
 248
 249 size_t wxEnhMetaFileDataObject::GetFormatCount(Direction WXUNUSED(dir)) const
 250 {
 251     // wxDF_ENHMETAFILE and wxDF_METAFILE
 252     return 2;
 253 }
 254
 255 void wxEnhMetaFileDataObject::GetAllFormats(wxDataFormat *formats,
 256                                             Direction WXUNUSED(dir)) const
 257 {
 258     formats[0] = wxDF_ENHMETAFILE;
 259     formats[1] = wxDF_METAFILE;
 260 }
 261
 262 size_t wxEnhMetaFileDataObject::GetDataSize(const wxDataFormat& format) const
 263 {
 264     if ( format == wxDF_ENHMETAFILE )
 265     {
 266         // we pass data by handle and not HGLOBAL
 267         return 0u;
 268     }
 269     else
 270     {
 271         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 272
 273         return sizeof(METAFILEPICT);
 274     }
 275 }
 276
 277 bool wxEnhMetaFileDataObject::GetDataHere(const wxDataFormat& format, void *buf) const
 278 {
 279     wxCHECK_MSG( m_metafile.Ok(), FALSE, _T("copying invalid enh metafile") );
 280
 281     HENHMETAFILE hEMF = (HENHMETAFILE)m_metafile.GetHENHMETAFILE();
 282
 283     if ( format == wxDF_ENHMETAFILE )
 284     {
 285         HENHMETAFILE hEMFCopy = ::CopyEnhMetaFile(hEMF, NULL);
 286         if ( !hEMFCopy )
 287         {
 288             wxLogLastError(_T("CopyEnhMetaFile"));
 289
 290             return FALSE;
 291         }
 292
 293         *(HENHMETAFILE *)buf = hEMFCopy;
 294     }
 295     else
 296     {
 297         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 298
 299         // convert to WMF
 300
 301         ScreenHDC hdc;
 302
 303         // first get the buffer size and alloc memory
 304         size_t size = ::GetWinMetaFileBits(hEMF, 0, NULL, MM_ANISOTROPIC, hdc);
 305         wxCHECK_MSG( size, FALSE, _T("GetWinMetaFileBits() failed") );
 306
 307         BYTE *bits = (BYTE *)malloc(size);
 308
 309         // then get the enh metafile bits
 310         if ( !::GetWinMetaFileBits(hEMF, size, bits, MM_ANISOTROPIC, hdc) )
 311         {
 312             wxLogLastError(_T("GetWinMetaFileBits"));
 313
 314             free(bits);
 315
 316             return FALSE;
 317         }
 318
 319         // and finally convert them to the WMF
 320         HMETAFILE hMF = ::SetMetaFileBitsEx(size, bits);
 321         free(bits);
 322         if ( !hMF )
 323         {
 324             wxLogLastError(_T("SetMetaFileBitsEx"));
 325
 326             return FALSE;
 327         }
 328
 329         METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 330
 331         wxSize sizeMF = m_metafile.GetSize();
 332         mfpict->hMF  = hMF;
 333         mfpict->mm   = MM_ANISOTROPIC;
 334         mfpict->xExt = sizeMF.x;
 335         mfpict->yExt = sizeMF.y;
 336
 337         PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 338     }
 339
 340     return TRUE;
 341 }
 342
 343 bool wxEnhMetaFileDataObject::SetData(const wxDataFormat& format,
 344                                       size_t WXUNUSED(len),
 345                                       const void *buf)
 346 {
 347     HENHMETAFILE hEMF;
 348
 349     if ( format == wxDF_ENHMETAFILE )
 350     {
 351         hEMF = *(HENHMETAFILE *)buf;
 352
 353         wxCHECK_MSG( hEMF, FALSE, _T("pasting invalid enh metafile") );
 354     }
 355     else
 356     {
 357         wxASSERT_MSG( format == wxDF_METAFILE, _T("unsupported format") );
 358
 359         // convert from WMF
 360         const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 361
 362         // first get the buffer size
 363         size_t size = ::GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 364         wxCHECK_MSG( size, FALSE, _T("GetMetaFileBitsEx() failed") );
 365
 366         // then get metafile bits
 367         BYTE *bits = (BYTE *)malloc(size);
 368         if ( !::GetMetaFileBitsEx(mfpict->hMF, size, bits) )
 369         {
 370             wxLogLastError(_T("GetMetaFileBitsEx"));
 371
 372             free(bits);
 373
 374             return FALSE;
 375         }
 376
 377         ScreenHDC hdcRef;
 378
 379         // and finally create an enhanced metafile from them
 380         hEMF = ::SetWinMetaFileBits(size, bits, hdcRef, mfpict);
 381         free(bits);
 382         if ( !hEMF )
 383         {
 384             wxLogLastError(_T("SetWinMetaFileBits"));
 385
 386             return FALSE;
 387         }
 388     }
 389
 390     m_metafile.SetHENHMETAFILE((WXHANDLE)hEMF);
 391
 392     return TRUE;
 393 }
 394 #endif // wxUSE_DRAG_AND_DROP
 395
 396 #endif // wxUSE_ENH_METAFILE