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