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 wxGDIRefData *wxMetafile::CreateGDIRefData() const
  98 {
  99     return new wxMetafileRefData;
 100 }
 101
 102 wxGDIRefData *wxMetafile::CloneGDIRefData(const wxGDIRefData *data) const
 103 {
 104     return new wxMetafileRefData(wx_static_cast(wxMetafileRefData *, data));
 105 }
 106
 107 bool wxMetafile::SetClipboard(int width, int height)
 108 {
 109 #if !wxUSE_CLIPBOARD
 110     return false;
 111 #else
 112     if (!m_refData)
 113         return false;
 114
 115     bool alreadyOpen = wxClipboardOpen();
 116     if (!alreadyOpen)
 117     {
 118         wxOpenClipboard();
 119         if (!wxEmptyClipboard())
 120             return false;
 121     }
 122     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
 123     if (!alreadyOpen)
 124         wxCloseClipboard();
 125
 126     return success;
 127 #endif
 128 }
 129
 130 bool wxMetafile::Play(wxDC *dc)
 131 {
 132     if (!m_refData)
 133         return false;
 134
 135     if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
 136     {
 137         if ( !::PlayMetaFile(GetHdcOf(*dc), (HMETAFILE)
 138                              M_METAFILEDATA->m_metafile) )
 139         {
 140             wxLogLastError(_T("PlayMetaFile"));
 141         }
 142     }
 143
 144     return true;
 145 }
 146
 147 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 148 {
 149     if (!m_refData)
 150         m_refData = new wxMetafileRefData;
 151
 152     M_METAFILEDATA->m_metafile = mf;
 153 }
 154
 155 void wxMetafile::SetWindowsMappingMode(int mm)
 156 {
 157     if (!m_refData)
 158         m_refData = new wxMetafileRefData;
 159
 160     M_METAFILEDATA->m_windowsMappingMode = mm;
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // Metafile device context
 165 // ----------------------------------------------------------------------------
 166
 167 // Original constructor that does not takes origin and extent. If you use this,
 168 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 169 wxMetafileDC::wxMetafileDC(const wxString& file)
 170 {
 171     m_metaFile = NULL;
 172     m_minX = 10000;
 173     m_minY = 10000;
 174     m_maxX = -10000;
 175     m_maxY = -10000;
 176     //  m_title = NULL;
 177
 178     if (!file.IsNull() && wxFileExists(file))
 179         wxRemoveFile(file);
 180
 181     if (!file.IsNull() && (file != wxEmptyString))
 182         m_hDC = (WXHDC) CreateMetaFile(file);
 183     else
 184         m_hDC = (WXHDC) CreateMetaFile(NULL);
 185
 186     m_ok = (m_hDC != (WXHDC) 0) ;
 187
 188     // Actual Windows mapping mode, for future reference.
 189     m_windowsMappingMode = wxMM_TEXT;
 190
 191     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 192 }
 193
 194 // New constructor that takes origin and extent. If you use this, don't
 195 // give origin/extent arguments to wxMakeMetafilePlaceable.
 196 wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 197 {
 198     m_minX = 10000;
 199     m_minY = 10000;
 200     m_maxX = -10000;
 201     m_maxY = -10000;
 202     if ( !file.empty() && wxFileExists(file) )
 203         wxRemoveFile(file);
 204     m_hDC = (WXHDC) CreateMetaFile(file.empty() ? NULL : file.wx_str());
 205
 206     m_ok = true;
 207
 208     ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 209     ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 210
 211     // Actual Windows mapping mode, for future reference.
 212     m_windowsMappingMode = wxMM_ANISOTROPIC;
 213
 214     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 215 }
 216
 217 wxMetafileDC::~wxMetafileDC()
 218 {
 219     m_hDC = 0;
 220 }
 221
 222 void wxMetafileDC::DoGetTextExtent(const wxString& string,
 223                                    wxCoord *x, wxCoord *y,
 224                                    wxCoord *descent, wxCoord *externalLeading,
 225                                    const wxFont *theFont) const
 226 {
 227     const wxFont *fontToUse = theFont;
 228     if (!fontToUse)
 229         fontToUse = &m_font;
 230
 231     ScreenHDC dc;
 232     SelectInHDC selFont(dc, GetHfontOf(*fontToUse));
 233
 234     SIZE sizeRect;
 235     TEXTMETRIC tm;
 236     ::GetTextExtentPoint32(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 237     ::GetTextMetrics(dc, &tm);
 238
 239     if ( x )
 240         *x = sizeRect.cx;
 241     if ( y )
 242         *y = sizeRect.cy;
 243     if ( descent )
 244         *descent = tm.tmDescent;
 245     if ( externalLeading )
 246         *externalLeading = tm.tmExternalLeading;
 247 }
 248
 249 void wxMetafileDC::DoGetSize(int *width, int *height) const
 250 {
 251     wxCHECK_RET( m_refData, _T("invalid wxMetafileDC") );
 252
 253     if ( width )
 254         *width = M_METAFILEDATA->m_width;
 255     if ( height )
 256         *height = M_METAFILEDATA->m_height;
 257 }
 258
 259 wxMetafile *wxMetafileDC::Close()
 260 {
 261     SelectOldObjects(m_hDC);
 262     HANDLE mf = CloseMetaFile((HDC) m_hDC);
 263     m_hDC = 0;
 264     if (mf)
 265     {
 266         wxMetafile *wx_mf = new wxMetafile;
 267         wx_mf->SetHMETAFILE((WXHANDLE) mf);
 268         wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 269         return wx_mf;
 270     }
 271     return NULL;
 272 }
 273
 274 void wxMetafileDC::SetMapMode(int mode)
 275 {
 276     m_mappingMode = mode;
 277
 278     //  int pixel_width = 0;
 279     //  int pixel_height = 0;
 280     //  int mm_width = 0;
 281     //  int mm_height = 0;
 282
 283     float mm2pixelsX = 10.0;
 284     float mm2pixelsY = 10.0;
 285
 286     switch (mode)
 287     {
 288         case wxMM_TWIPS:
 289             {
 290                 m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 291                 m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 292                 break;
 293             }
 294         case wxMM_POINTS:
 295             {
 296                 m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 297                 m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 298                 break;
 299             }
 300         case wxMM_METRIC:
 301             {
 302                 m_logicalScaleX = mm2pixelsX;
 303                 m_logicalScaleY = mm2pixelsY;
 304                 break;
 305             }
 306         case wxMM_LOMETRIC:
 307             {
 308                 m_logicalScaleX = (float)(mm2pixelsX/10.0);
 309                 m_logicalScaleY = (float)(mm2pixelsY/10.0);
 310                 break;
 311             }
 312         default:
 313         case wxMM_TEXT:
 314             {
 315                 m_logicalScaleX = 1.0;
 316                 m_logicalScaleY = 1.0;
 317                 break;
 318             }
 319     }
 320 }
 321
 322 // ----------------------------------------------------------------------------
 323 // wxMakeMetafilePlaceable
 324 // ----------------------------------------------------------------------------
 325
 326 #ifdef __WIN32__
 327 struct RECT32
 328 {
 329   short left;
 330   short top;
 331   short right;
 332   short bottom;
 333 };
 334
 335 struct mfPLACEABLEHEADER {
 336     DWORD    key;
 337     short    hmf;
 338     RECT32    bbox;
 339     WORD    inch;
 340     DWORD    reserved;
 341     WORD    checksum;
 342 };
 343 #else
 344 struct mfPLACEABLEHEADER {
 345     DWORD    key;
 346     HANDLE    hmf;
 347     RECT    bbox;
 348     WORD    inch;
 349     DWORD    reserved;
 350     WORD    checksum;
 351 };
 352 #endif
 353
 354 /*
 355  * Pass filename of existing non-placeable metafile, and bounding box.
 356  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 357  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 358  *
 359  */
 360
 361 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 362 {
 363     return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
 364 }
 365
 366 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 367 {
 368     // I'm not sure if this is the correct way of suggesting a scale
 369     // to the client application, but it's the only way I can find.
 370     int unitsPerInch = (int)(576/scale);
 371
 372     mfPLACEABLEHEADER header;
 373     header.key = 0x9AC6CDD7L;
 374     header.hmf = 0;
 375     header.bbox.left = (int)(x1);
 376     header.bbox.top = (int)(y1);
 377     header.bbox.right = (int)(x2);
 378     header.bbox.bottom = (int)(y2);
 379     header.inch = unitsPerInch;
 380     header.reserved = 0;
 381
 382     // Calculate checksum
 383     WORD *p;
 384     mfPLACEABLEHEADER *pMFHead = &header;
 385     for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 386             p < (WORD *)&pMFHead ->checksum; ++p)
 387         pMFHead ->checksum ^= *p;
 388
 389     FILE *fd = wxFopen(filename.fn_str(), _T("rb"));
 390     if (!fd) return false;
 391
 392     wxChar tempFileBuf[256];
 393     wxGetTempFileName(wxT("mf"), tempFileBuf);
 394     FILE *fHandle = wxFopen(wxFNCONV(tempFileBuf), _T("wb"));
 395     if (!fHandle)
 396         return false;
 397     fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 398
 399     // Calculate origin and extent
 400     int originX = x1;
 401     int originY = y1;
 402     int extentX = x2 - x1;
 403     int extentY = (y2 - y1);
 404
 405     // Read metafile header and write
 406     METAHEADER metaHeader;
 407     fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 408
 409     if (useOriginAndExtent)
 410         metaHeader.mtSize += 15;
 411     else
 412         metaHeader.mtSize += 5;
 413
 414     fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 415
 416     // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 417     char modeBuffer[8];
 418     char originBuffer[10];
 419     char extentBuffer[10];
 420     METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 421
 422     METARECORD *originRecord = (METARECORD *)&originBuffer;
 423     METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 424
 425     modeRecord->rdSize = 4;
 426     modeRecord->rdFunction = META_SETMAPMODE;
 427     modeRecord->rdParm[0] = MM_ANISOTROPIC;
 428
 429     originRecord->rdSize = 5;
 430     originRecord->rdFunction = META_SETWINDOWORG;
 431     originRecord->rdParm[0] = originY;
 432     originRecord->rdParm[1] = originX;
 433
 434     extentRecord->rdSize = 5;
 435     extentRecord->rdFunction = META_SETWINDOWEXT;
 436     extentRecord->rdParm[0] = extentY;
 437     extentRecord->rdParm[1] = extentX;
 438
 439     fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 440
 441     if (useOriginAndExtent)
 442     {
 443         fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 444         fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 445     }
 446
 447     int ch = -2;
 448     while (ch != EOF)
 449     {
 450         ch = getc(fd);
 451         if (ch != EOF)
 452         {
 453             putc(ch, fHandle);
 454         }
 455     }
 456     fclose(fHandle);
 457     fclose(fd);
 458     wxRemoveFile(filename);
 459     wxCopyFile(tempFileBuf, filename);
 460     wxRemoveFile(tempFileBuf);
 461     return true;
 462 }
 463
 464
 465 #if wxUSE_DRAG_AND_DROP
 466
 467 // ----------------------------------------------------------------------------
 468 // wxMetafileDataObject
 469 // ----------------------------------------------------------------------------
 470
 471 size_t wxMetafileDataObject::GetDataSize() const
 472 {
 473     return sizeof(METAFILEPICT);
 474 }
 475
 476 bool wxMetafileDataObject::GetDataHere(void *buf) const
 477 {
 478     METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 479     const wxMetafile& mf = GetMetafile();
 480
 481     wxCHECK_MSG( mf.GetHMETAFILE(), false, _T("copying invalid metafile") );
 482
 483     // doesn't seem to work with any other mapping mode...
 484     mfpict->mm   = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
 485     mfpict->xExt = mf.GetWidth();
 486     mfpict->yExt = mf.GetHeight();
 487
 488     // transform the picture size to HIMETRIC units (0.01mm) - as we don't know
 489     // what DC the picture will be rendered to, use the default display one
 490     PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 491
 492     mfpict->hMF  = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);
 493
 494     return true;
 495 }
 496
 497 bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 498 {
 499     const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 500
 501     wxMetafile mf;
 502     mf.SetWindowsMappingMode(mfpict->mm);
 503
 504     LONG w = mfpict->xExt,
 505          h = mfpict->yExt;
 506     if ( mfpict->mm == MM_ANISOTROPIC )
 507     {
 508         // in this case xExt and yExt contain suggested size in HIMETRIC units
 509         // (0.01 mm) - transform this to something more reasonable (pixels)
 510         HIMETRICToPixel(&w, &h);
 511     }
 512
 513     mf.SetWidth(w);
 514     mf.SetHeight(h);
 515     mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);
 516
 517     wxCHECK_MSG( mfpict->hMF, false, _T("pasting invalid metafile") );
 518
 519     SetMetafile(mf);
 520
 521     return true;
 522 }
 523
 524 #endif // wxUSE_DRAG_AND_DROP
 525
 526 #endif // wxUSE_METAFILE