src/msw/metafile.cpp

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