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