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 #include "wx/filename.h"
  34
  35 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)
  36
  37 #include "wx/clipbrd.h"
  38 #include "wx/msw/private.h"
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42
  43 // ----------------------------------------------------------------------------
  44 // wxWin macros
  45 // ----------------------------------------------------------------------------
  46
  47 IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
  48 IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
  49
  50 // ============================================================================
  51 // implementation
  52 // ============================================================================
  53
  54 // ----------------------------------------------------------------------------
  55 // wxMetafileRefData
  56 // ----------------------------------------------------------------------------
  57
  58 /*
  59  * Metafiles
  60  * Currently, the only purpose for making a metafile is to put
  61  * it on the clipboard.
  62  */
  63
  64 wxMetafileRefData::wxMetafileRefData()
  65 {
  66     m_metafile = 0;
  67     m_windowsMappingMode = MM_ANISOTROPIC;
  68     m_width = m_height = 0;
  69 }
  70
  71 wxMetafileRefData::~wxMetafileRefData()
  72 {
  73     if (m_metafile)
  74     {
  75         DeleteMetaFile((HMETAFILE) m_metafile);
  76         m_metafile = 0;
  77     }
  78 }
  79
  80 // ----------------------------------------------------------------------------
  81 // wxMetafile
  82 // ----------------------------------------------------------------------------
  83
  84 wxMetafile::wxMetafile(const wxString& file)
  85 {
  86     m_refData = new wxMetafileRefData;
  87
  88     M_METAFILEDATA->m_windowsMappingMode = MM_ANISOTROPIC;
  89     M_METAFILEDATA->m_metafile = 0;
  90     if (!file.empty())
  91         M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
  92 }
  93
  94 wxMetafile::~wxMetafile()
  95 {
  96 }
  97
  98 wxGDIRefData *wxMetafile::CreateGDIRefData() const
  99 {
 100     return new wxMetafileRefData;
 101 }
 102
 103 wxGDIRefData *wxMetafile::CloneGDIRefData(const wxGDIRefData *data) const
 104 {
 105     return new wxMetafileRefData(*static_cast<const wxMetafileRefData *>(data));
 106 }
 107
 108 bool wxMetafile::SetClipboard(int width, int height)
 109 {
 110 #if !wxUSE_CLIPBOARD
 111     return false;
 112 #else
 113     if (!m_refData)
 114         return false;
 115
 116     bool alreadyOpen = wxClipboardOpen();
 117     if (!alreadyOpen)
 118     {
 119         wxOpenClipboard();
 120         if (!wxEmptyClipboard())
 121             return false;
 122     }
 123     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
 124     if (!alreadyOpen)
 125         wxCloseClipboard();
 126
 127     return success;
 128 #endif
 129 }
 130
 131 bool wxMetafile::Play(wxDC *dc)
 132 {
 133     if (!m_refData)
 134         return false;
 135
 136     if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
 137     {
 138         if ( !::PlayMetaFile(GetHdcOf(*dc), (HMETAFILE)
 139                              M_METAFILEDATA->m_metafile) )
 140         {
 141             wxLogLastError(wxT("PlayMetaFile"));
 142         }
 143     }
 144
 145     return true;
 146 }
 147
 148 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 149 {
 150     if (!m_refData)
 151         m_refData = new wxMetafileRefData;
 152
 153     M_METAFILEDATA->m_metafile = mf;
 154 }
 155
 156 void wxMetafile::SetWindowsMappingMode(int mm)
 157 {
 158     if (!m_refData)
 159         m_refData = new wxMetafileRefData;
 160
 161     M_METAFILEDATA->m_windowsMappingMode = mm;
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // Metafile device context
 166 // ----------------------------------------------------------------------------
 167
 168 // Original constructor that does not takes origin and extent. If you use this,
 169 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 170 wxMetafileDCImpl::wxMetafileDCImpl(wxDC *owner, const wxString& file)
 171     : wxMSWDCImpl(owner)
 172 {
 173     m_metaFile = NULL;
 174     m_minX = 10000;
 175     m_minY = 10000;
 176     m_maxX = -10000;
 177     m_maxY = -10000;
 178     //  m_title = NULL;
 179
 180     if ( wxFileExists(file) )
 181         wxRemoveFile(file);
 182
 183     if ( file.empty() )
 184         m_hDC = (WXHDC) CreateMetaFile(NULL);
 185     else
 186         m_hDC = (WXHDC) CreateMetaFile(file);
 187
 188     m_ok = (m_hDC != (WXHDC) 0) ;
 189
 190     // Actual Windows mapping mode, for future reference.
 191     m_windowsMappingMode = wxMM_TEXT;
 192
 193     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 194 }
 195
 196 // New constructor that takes origin and extent. If you use this, don't
 197 // give origin/extent arguments to wxMakeMetafilePlaceable.
 198 wxMetafileDCImpl::wxMetafileDCImpl(wxDC *owner, const wxString& file,
 199                                    int xext, int yext, int xorg, int yorg)
 200     : wxMSWDCImpl(owner)
 201 {
 202     m_minX = 10000;
 203     m_minY = 10000;
 204     m_maxX = -10000;
 205     m_maxY = -10000;
 206     if ( !file.empty() && wxFileExists(file) )
 207         wxRemoveFile(file);
 208     m_hDC = (WXHDC) CreateMetaFile(file.empty() ? NULL : file.wx_str());
 209
 210     m_ok = true;
 211
 212     ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 213     ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 214
 215     // Actual Windows mapping mode, for future reference.
 216     m_windowsMappingMode = MM_ANISOTROPIC;
 217
 218     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 219 }
 220
 221 wxMetafileDCImpl::~wxMetafileDCImpl()
 222 {
 223     m_hDC = 0;
 224 }
 225
 226 void wxMetafileDCImpl::DoGetTextExtent(const wxString& string,
 227                                        wxCoord *x, wxCoord *y,
 228                                        wxCoord *descent, wxCoord *externalLeading,
 229                                        const wxFont *theFont) const
 230 {
 231     const wxFont *fontToUse = theFont;
 232     if (!fontToUse)
 233         fontToUse = &m_font;
 234
 235     ScreenHDC dc;
 236     SelectInHDC selFont(dc, GetHfontOf(*fontToUse));
 237
 238     SIZE sizeRect;
 239     TEXTMETRIC tm;
 240     ::GetTextExtentPoint32(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 241     ::GetTextMetrics(dc, &tm);
 242
 243     if ( x )
 244         *x = sizeRect.cx;
 245     if ( y )
 246         *y = sizeRect.cy;
 247     if ( descent )
 248         *descent = tm.tmDescent;
 249     if ( externalLeading )
 250         *externalLeading = tm.tmExternalLeading;
 251 }
 252
 253 void wxMetafileDCImpl::DoGetSize(int *width, int *height) const
 254 {
 255     wxCHECK_RET( m_refData, wxT("invalid wxMetafileDC") );
 256
 257     if ( width )
 258         *width = M_METAFILEDATA->m_width;
 259     if ( height )
 260         *height = M_METAFILEDATA->m_height;
 261 }
 262
 263 wxMetafile *wxMetafileDCImpl::Close()
 264 {
 265     SelectOldObjects(m_hDC);
 266     HANDLE mf = CloseMetaFile((HDC) m_hDC);
 267     m_hDC = 0;
 268     if (mf)
 269     {
 270         wxMetafile *wx_mf = new wxMetafile;
 271         wx_mf->SetHMETAFILE((WXHANDLE) mf);
 272         wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 273         return wx_mf;
 274     }
 275     return NULL;
 276 }
 277
 278 void wxMetafileDCImpl::SetMapMode(wxMappingMode mode)
 279 {
 280     m_mappingMode = mode;
 281
 282     //  int pixel_width = 0;
 283     //  int pixel_height = 0;
 284     //  int mm_width = 0;
 285     //  int mm_height = 0;
 286
 287     float mm2pixelsX = 10.0;
 288     float mm2pixelsY = 10.0;
 289
 290     switch (mode)
 291     {
 292         case wxMM_TWIPS:
 293             {
 294                 m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 295                 m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 296                 break;
 297             }
 298         case wxMM_POINTS:
 299             {
 300                 m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 301                 m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 302                 break;
 303             }
 304         case wxMM_METRIC:
 305             {
 306                 m_logicalScaleX = mm2pixelsX;
 307                 m_logicalScaleY = mm2pixelsY;
 308                 break;
 309             }
 310         case wxMM_LOMETRIC:
 311             {
 312                 m_logicalScaleX = (float)(mm2pixelsX/10.0);
 313                 m_logicalScaleY = (float)(mm2pixelsY/10.0);
 314                 break;
 315             }
 316         default:
 317         case wxMM_TEXT:
 318             {
 319                 m_logicalScaleX = 1.0;
 320                 m_logicalScaleY = 1.0;
 321                 break;
 322             }
 323     }
 324 }
 325
 326 // ----------------------------------------------------------------------------
 327 // wxMakeMetafilePlaceable
 328 // ----------------------------------------------------------------------------
 329
 330 #ifdef __WIN32__
 331 struct RECT32
 332 {
 333   short left;
 334   short top;
 335   short right;
 336   short bottom;
 337 };
 338
 339 struct mfPLACEABLEHEADER {
 340     DWORD    key;
 341     short    hmf;
 342     RECT32    bbox;
 343     WORD    inch;
 344     DWORD    reserved;
 345     WORD    checksum;
 346 };
 347 #else
 348 struct mfPLACEABLEHEADER {
 349     DWORD    key;
 350     HANDLE    hmf;
 351     RECT    bbox;
 352     WORD    inch;
 353     DWORD    reserved;
 354     WORD    checksum;
 355 };
 356 #endif
 357
 358 /*
 359  * Pass filename of existing non-placeable metafile, and bounding box.
 360  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 361  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 362  *
 363  */
 364
 365 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 366 {
 367     return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
 368 }
 369
 370 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 371 {
 372     // I'm not sure if this is the correct way of suggesting a scale
 373     // to the client application, but it's the only way I can find.
 374     int unitsPerInch = (int)(576/scale);
 375
 376     mfPLACEABLEHEADER header;
 377     header.key = 0x9AC6CDD7L;
 378     header.hmf = 0;
 379     header.bbox.left = (int)(x1);
 380     header.bbox.top = (int)(y1);
 381     header.bbox.right = (int)(x2);
 382     header.bbox.bottom = (int)(y2);
 383     header.inch = unitsPerInch;
 384     header.reserved = 0;
 385
 386     // Calculate checksum
 387     WORD *p;
 388     mfPLACEABLEHEADER *pMFHead = &header;
 389     for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 390             p < (WORD *)&pMFHead ->checksum; ++p)
 391         pMFHead ->checksum ^= *p;
 392
 393     FILE *fd = wxFopen(filename.fn_str(), wxT("rb"));
 394     if (!fd) return false;
 395
 396     wxString tempFileBuf = wxFileName::CreateTempFileName(wxT("mf"));
 397     if (tempFileBuf.empty())
 398         return false;
 399
 400     FILE *fHandle = wxFopen(tempFileBuf.fn_str(), wxT("wb"));
 401     if (!fHandle)
 402         return false;
 403     fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 404
 405     // Calculate origin and extent
 406     int originX = x1;
 407     int originY = y1;
 408     int extentX = x2 - x1;
 409     int extentY = (y2 - y1);
 410
 411     // Read metafile header and write
 412     METAHEADER metaHeader;
 413     fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 414
 415     if (useOriginAndExtent)
 416         metaHeader.mtSize += 15;
 417     else
 418         metaHeader.mtSize += 5;
 419
 420     fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 421
 422     // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 423     char modeBuffer[8];
 424     char originBuffer[10];
 425     char extentBuffer[10];
 426     METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 427
 428     METARECORD *originRecord = (METARECORD *)&originBuffer;
 429     METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 430
 431     modeRecord->rdSize = 4;
 432     modeRecord->rdFunction = META_SETMAPMODE;
 433     modeRecord->rdParm[0] = MM_ANISOTROPIC;
 434
 435     originRecord->rdSize = 5;
 436     originRecord->rdFunction = META_SETWINDOWORG;
 437     originRecord->rdParm[0] = originY;
 438     originRecord->rdParm[1] = originX;
 439
 440     extentRecord->rdSize = 5;
 441     extentRecord->rdFunction = META_SETWINDOWEXT;
 442     extentRecord->rdParm[0] = extentY;
 443     extentRecord->rdParm[1] = extentX;
 444
 445     fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 446
 447     if (useOriginAndExtent)
 448     {
 449         fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 450         fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 451     }
 452
 453     int ch = -2;
 454     while (ch != EOF)
 455     {
 456         ch = getc(fd);
 457         if (ch != EOF)
 458         {
 459             putc(ch, fHandle);
 460         }
 461     }
 462     fclose(fHandle);
 463     fclose(fd);
 464     wxRemoveFile(filename);
 465     wxCopyFile(tempFileBuf, filename);
 466     wxRemoveFile(tempFileBuf);
 467     return true;
 468 }
 469
 470
 471 #if wxUSE_DRAG_AND_DROP
 472
 473 // ----------------------------------------------------------------------------
 474 // wxMetafileDataObject
 475 // ----------------------------------------------------------------------------
 476
 477 size_t wxMetafileDataObject::GetDataSize() const
 478 {
 479     return sizeof(METAFILEPICT);
 480 }
 481
 482 bool wxMetafileDataObject::GetDataHere(void *buf) const
 483 {
 484     METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 485     const wxMetafile& mf = GetMetafile();
 486
 487     wxCHECK_MSG( mf.GetHMETAFILE(), false, wxT("copying invalid metafile") );
 488
 489     // doesn't seem to work with any other mapping mode...
 490     mfpict->mm   = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
 491     mfpict->xExt = mf.GetWidth();
 492     mfpict->yExt = mf.GetHeight();
 493
 494     // transform the picture size to HIMETRIC units (0.01mm) - as we don't know
 495     // what DC the picture will be rendered to, use the default display one
 496     PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 497
 498     mfpict->hMF  = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);
 499
 500     return true;
 501 }
 502
 503 bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 504 {
 505     const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 506
 507     wxMetafile mf;
 508     mf.SetWindowsMappingMode(mfpict->mm);
 509
 510     LONG w = mfpict->xExt,
 511          h = mfpict->yExt;
 512     if ( mfpict->mm == MM_ANISOTROPIC )
 513     {
 514         // in this case xExt and yExt contain suggested size in HIMETRIC units
 515         // (0.01 mm) - transform this to something more reasonable (pixels)
 516         HIMETRICToPixel(&w, &h);
 517     }
 518
 519     mf.SetWidth(w);
 520     mf.SetHeight(h);
 521     mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);
 522
 523     wxCHECK_MSG( mfpict->hMF, false, wxT("pasting invalid metafile") );
 524
 525     SetMetafile(mf);
 526
 527     return true;
 528 }
 529
 530 #endif // wxUSE_DRAG_AND_DROP
 531
 532 #endif // wxUSE_METAFILE