src/msw/metafile.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/metafile.cpp
   3 // Purpose:     wxMetafileDC etc.
   4 // Author:      Julian Smart
   5 // Modified by: VZ 07.01.00: implemented wxMetaFileDataObject
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   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 #ifndef WX_PRECOMP
  28     #include "wx/utils.h"
  29     #include "wx/app.h"
  30 #endif
  31
  32 #include "wx/metafile.h"
  33
  34 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)
  35
  36 #include "wx/clipbrd.h"
  37 #include "wx/msw/private.h"
  38
  39 #include <stdio.h>
  40 #include <string.h>
  41
  42 // ----------------------------------------------------------------------------
  43 // wxWin macros
  44 // ----------------------------------------------------------------------------
  45
  46 IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
  47 IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
  48
  49 // ============================================================================
  50 // implementation
  51 // ============================================================================
  52
  53 // ----------------------------------------------------------------------------
  54 // wxMetafileRefData
  55 // ----------------------------------------------------------------------------
  56
  57 /*
  58  * Metafiles
  59  * Currently, the only purpose for making a metafile is to put
  60  * it on the clipboard.
  61  */
  62
  63 wxMetafileRefData::wxMetafileRefData()
  64 {
  65     m_metafile = 0;
  66     m_windowsMappingMode = wxMM_ANISOTROPIC;
  67     m_width = m_height = 0;
  68 }
  69
  70 wxMetafileRefData::~wxMetafileRefData()
  71 {
  72     if (m_metafile)
  73     {
  74         DeleteMetaFile((HMETAFILE) m_metafile);
  75         m_metafile = 0;
  76     }
  77 }
  78
  79 // ----------------------------------------------------------------------------
  80 // wxMetafile
  81 // ----------------------------------------------------------------------------
  82
  83 wxMetafile::wxMetafile(const wxString& file)
  84 {
  85     m_refData = new wxMetafileRefData;
  86
  87     M_METAFILEDATA->m_windowsMappingMode = wxMM_ANISOTROPIC;
  88     M_METAFILEDATA->m_metafile = 0;
  89     if (!file.empty())
  90         M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
  91 }
  92
  93 wxMetafile::~wxMetafile()
  94 {
  95 }
  96
  97 bool wxMetafile::SetClipboard(int width, int height)
  98 {
  99 #if !wxUSE_CLIPBOARD
 100     return false;
 101 #else
 102     if (!m_refData)
 103         return false;
 104
 105     bool alreadyOpen = wxClipboardOpen();
 106     if (!alreadyOpen)
 107     {
 108         wxOpenClipboard();
 109         if (!wxEmptyClipboard())
 110             return false;
 111     }
 112     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
 113     if (!alreadyOpen)
 114         wxCloseClipboard();
 115
 116     return success;
 117 #endif
 118 }
 119
 120 bool wxMetafile::Play(wxDC *dc)
 121 {
 122     if (!m_refData)
 123         return false;
 124
 125     dc->BeginDrawing();
 126
 127     if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
 128     {
 129         if ( !::PlayMetaFile(GetHdcOf(*dc), (HMETAFILE)
 130                              M_METAFILEDATA->m_metafile) )
 131         {
 132             wxLogLastError(_T("PlayMetaFile"));
 133         }
 134     }
 135
 136     dc->EndDrawing();
 137
 138     return true;
 139 }
 140
 141 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 142 {
 143     if (!m_refData)
 144         m_refData = new wxMetafileRefData;
 145
 146     M_METAFILEDATA->m_metafile = mf;
 147 }
 148
 149 void wxMetafile::SetWindowsMappingMode(int mm)
 150 {
 151     if (!m_refData)
 152         m_refData = new wxMetafileRefData;
 153
 154     M_METAFILEDATA->m_windowsMappingMode = mm;
 155 }
 156
 157 // ----------------------------------------------------------------------------
 158 // Metafile device context
 159 // ----------------------------------------------------------------------------
 160
 161 // Original constructor that does not takes origin and extent. If you use this,
 162 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 163 wxMetafileDC::wxMetafileDC(const wxString& file)
 164 {
 165     m_metaFile = NULL;
 166     m_minX = 10000;
 167     m_minY = 10000;
 168     m_maxX = -10000;
 169     m_maxY = -10000;
 170     //  m_title = NULL;
 171
 172     if (!file.IsNull() && wxFileExists(file))
 173         wxRemoveFile(file);
 174
 175     if (!file.IsNull() && (file != wxEmptyString))
 176         m_hDC = (WXHDC) CreateMetaFile(file);
 177     else
 178         m_hDC = (WXHDC) CreateMetaFile(NULL);
 179
 180     m_ok = (m_hDC != (WXHDC) 0) ;
 181
 182     // Actual Windows mapping mode, for future reference.
 183     m_windowsMappingMode = wxMM_TEXT;
 184
 185     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 186 }
 187
 188 // New constructor that takes origin and extent. If you use this, don't
 189 // give origin/extent arguments to wxMakeMetafilePlaceable.
 190 wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 191 {
 192     m_minX = 10000;
 193     m_minY = 10000;
 194     m_maxX = -10000;
 195     m_maxY = -10000;
 196     if ( !file.empty() && wxFileExists(file))
 197         wxRemoveFile(file);
 198     m_hDC = (WXHDC) CreateMetaFile(file);
 199
 200     m_ok = true;
 201
 202     ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 203     ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 204
 205     // Actual Windows mapping mode, for future reference.
 206     m_windowsMappingMode = wxMM_ANISOTROPIC;
 207
 208     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 209 }
 210
 211 wxMetafileDC::~wxMetafileDC()
 212 {
 213     m_hDC = 0;
 214 }
 215
 216 void wxMetafileDC::GetTextExtent(const wxString& string, long *x, long *y,
 217                                  long *descent, long *externalLeading, wxFont *theFont, bool WXUNUSED(use16bit)) const
 218 {
 219     wxFont *fontToUse = theFont;
 220     if (!fontToUse)
 221         fontToUse = (wxFont*) &m_font;
 222
 223     HDC dc = GetDC(NULL);
 224
 225     SIZE sizeRect;
 226     TEXTMETRIC tm;
 227     ::GetTextExtentPoint32(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 228     GetTextMetrics(dc, &tm);
 229
 230     ReleaseDC(NULL, dc);
 231
 232     if ( x )
 233         *x = sizeRect.cx;
 234     if ( y )
 235         *y = sizeRect.cy;
 236     if ( descent )
 237         *descent = tm.tmDescent;
 238     if ( externalLeading )
 239         *externalLeading = tm.tmExternalLeading;
 240 }
 241
 242 void wxMetafileDC::DoGetSize(int *width, int *height) const
 243 {
 244     wxCHECK_RET( m_refData, _T("invalid wxMetafileDC") );
 245
 246     if ( width )
 247         *width = M_METAFILEDATA->m_width;
 248     if ( height )
 249         *height = M_METAFILEDATA->m_height;
 250 }
 251
 252 wxMetafile *wxMetafileDC::Close()
 253 {
 254     SelectOldObjects(m_hDC);
 255     HANDLE mf = CloseMetaFile((HDC) m_hDC);
 256     m_hDC = 0;
 257     if (mf)
 258     {
 259         wxMetafile *wx_mf = new wxMetafile;
 260         wx_mf->SetHMETAFILE((WXHANDLE) mf);
 261         wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 262         return wx_mf;
 263     }
 264     return NULL;
 265 }
 266
 267 void wxMetafileDC::SetMapMode(int mode)
 268 {
 269     m_mappingMode = mode;
 270
 271     //  int pixel_width = 0;
 272     //  int pixel_height = 0;
 273     //  int mm_width = 0;
 274     //  int mm_height = 0;
 275
 276     float mm2pixelsX = 10.0;
 277     float mm2pixelsY = 10.0;
 278
 279     switch (mode)
 280     {
 281         case wxMM_TWIPS:
 282             {
 283                 m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 284                 m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 285                 break;
 286             }
 287         case wxMM_POINTS:
 288             {
 289                 m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 290                 m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 291                 break;
 292             }
 293         case wxMM_METRIC:
 294             {
 295                 m_logicalScaleX = mm2pixelsX;
 296                 m_logicalScaleY = mm2pixelsY;
 297                 break;
 298             }
 299         case wxMM_LOMETRIC:
 300             {
 301                 m_logicalScaleX = (float)(mm2pixelsX/10.0);
 302                 m_logicalScaleY = (float)(mm2pixelsY/10.0);
 303                 break;
 304             }
 305         default:
 306         case wxMM_TEXT:
 307             {
 308                 m_logicalScaleX = 1.0;
 309                 m_logicalScaleY = 1.0;
 310                 break;
 311             }
 312     }
 313 }
 314
 315 // ----------------------------------------------------------------------------
 316 // wxMakeMetafilePlaceable
 317 // ----------------------------------------------------------------------------
 318
 319 #ifdef __WIN32__
 320 struct RECT32
 321 {
 322   short left;
 323   short top;
 324   short right;
 325   short bottom;
 326 };
 327
 328 struct mfPLACEABLEHEADER {
 329     DWORD    key;
 330     short    hmf;
 331     RECT32    bbox;
 332     WORD    inch;
 333     DWORD    reserved;
 334     WORD    checksum;
 335 };
 336 #else
 337 struct mfPLACEABLEHEADER {
 338     DWORD    key;
 339     HANDLE    hmf;
 340     RECT    bbox;
 341     WORD    inch;
 342     DWORD    reserved;
 343     WORD    checksum;
 344 };
 345 #endif
 346
 347 /*
 348  * Pass filename of existing non-placeable metafile, and bounding box.
 349  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 350  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 351  *
 352  */
 353
 354 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 355 {
 356     return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
 357 }
 358
 359 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 360 {
 361     // I'm not sure if this is the correct way of suggesting a scale
 362     // to the client application, but it's the only way I can find.
 363     int unitsPerInch = (int)(576/scale);
 364
 365     mfPLACEABLEHEADER header;
 366     header.key = 0x9AC6CDD7L;
 367     header.hmf = 0;
 368     header.bbox.left = (int)(x1);
 369     header.bbox.top = (int)(y1);
 370     header.bbox.right = (int)(x2);
 371     header.bbox.bottom = (int)(y2);
 372     header.inch = unitsPerInch;
 373     header.reserved = 0;
 374
 375     // Calculate checksum
 376     WORD *p;
 377     mfPLACEABLEHEADER *pMFHead = &header;
 378     for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 379             p < (WORD *)&pMFHead ->checksum; ++p)
 380         pMFHead ->checksum ^= *p;
 381
 382     FILE *fd = wxFopen(filename.fn_str(), _T("rb"));
 383     if (!fd) return false;
 384
 385     wxChar tempFileBuf[256];
 386     wxGetTempFileName(wxT("mf"), tempFileBuf);
 387     FILE *fHandle = wxFopen(wxFNCONV(tempFileBuf), _T("wb"));
 388     if (!fHandle)
 389         return false;
 390     fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 391
 392     // Calculate origin and extent
 393     int originX = x1;
 394     int originY = y1;
 395     int extentX = x2 - x1;
 396     int extentY = (y2 - y1);
 397
 398     // Read metafile header and write
 399     METAHEADER metaHeader;
 400     fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 401
 402     if (useOriginAndExtent)
 403         metaHeader.mtSize += 15;
 404     else
 405         metaHeader.mtSize += 5;
 406
 407     fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 408
 409     // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 410     char modeBuffer[8];
 411     char originBuffer[10];
 412     char extentBuffer[10];
 413     METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 414
 415     METARECORD *originRecord = (METARECORD *)&originBuffer;
 416     METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 417
 418     modeRecord->rdSize = 4;
 419     modeRecord->rdFunction = META_SETMAPMODE;
 420     modeRecord->rdParm[0] = MM_ANISOTROPIC;
 421
 422     originRecord->rdSize = 5;
 423     originRecord->rdFunction = META_SETWINDOWORG;
 424     originRecord->rdParm[0] = originY;
 425     originRecord->rdParm[1] = originX;
 426
 427     extentRecord->rdSize = 5;
 428     extentRecord->rdFunction = META_SETWINDOWEXT;
 429     extentRecord->rdParm[0] = extentY;
 430     extentRecord->rdParm[1] = extentX;
 431
 432     fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 433
 434     if (useOriginAndExtent)
 435     {
 436         fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 437         fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 438     }
 439
 440     int ch = -2;
 441     while (ch != EOF)
 442     {
 443         ch = getc(fd);
 444         if (ch != EOF)
 445         {
 446             putc(ch, fHandle);
 447         }
 448     }
 449     fclose(fHandle);
 450     fclose(fd);
 451     wxRemoveFile(filename);
 452     wxCopyFile(tempFileBuf, filename);
 453     wxRemoveFile(tempFileBuf);
 454     return true;
 455 }
 456
 457
 458 #if wxUSE_DRAG_AND_DROP
 459
 460 // ----------------------------------------------------------------------------
 461 // wxMetafileDataObject
 462 // ----------------------------------------------------------------------------
 463
 464 size_t wxMetafileDataObject::GetDataSize() const
 465 {
 466     return sizeof(METAFILEPICT);
 467 }
 468
 469 bool wxMetafileDataObject::GetDataHere(void *buf) const
 470 {
 471     METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 472     const wxMetafile& mf = GetMetafile();
 473
 474     wxCHECK_MSG( mf.GetHMETAFILE(), false, _T("copying invalid metafile") );
 475
 476     // doesn't seem to work with any other mapping mode...
 477     mfpict->mm   = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
 478     mfpict->xExt = mf.GetWidth();
 479     mfpict->yExt = mf.GetHeight();
 480
 481     // transform the picture size to HIMETRIC units (0.01mm) - as we don't know
 482     // what DC the picture will be rendered to, use the default display one
 483     PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 484
 485     mfpict->hMF  = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);
 486
 487     return true;
 488 }
 489
 490 bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 491 {
 492     const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 493
 494     wxMetafile mf;
 495     mf.SetWindowsMappingMode(mfpict->mm);
 496
 497     LONG w = mfpict->xExt,
 498          h = mfpict->yExt;
 499     if ( mfpict->mm == MM_ANISOTROPIC )
 500     {
 501         // in this case xExt and yExt contain suggested size in HIMETRIC units
 502         // (0.01 mm) - transform this to something more reasonable (pixels)
 503         HIMETRICToPixel(&w, &h);
 504     }
 505
 506     mf.SetWidth(w);
 507     mf.SetHeight(h);
 508     mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);
 509
 510     wxCHECK_MSG( mfpict->hMF, false, _T("pasting invalid metafile") );
 511
 512     SetMetafile(mf);
 513
 514     return true;
 515 }
 516
 517 #endif // wxUSE_DRAG_AND_DROP
 518
 519 #endif // wxUSE_METAFILE