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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "metafile.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/setup.h"
  33 #endif
  34
  35 #ifndef WX_PRECOMP
  36     #include "wx/utils.h"
  37     #include "wx/app.h"
  38 #endif
  39
  40 #include "wx/metafile.h"
  41
  42 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)
  43
  44 #include "wx/clipbrd.h"
  45 #include "wx/msw/private.h"
  46
  47 #include <stdio.h>
  48 #include <string.h>
  49
  50 // ----------------------------------------------------------------------------
  51 // wxWin macros
  52 // ----------------------------------------------------------------------------
  53
  54 IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
  55 IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
  56
  57 // ============================================================================
  58 // implementation
  59 // ============================================================================
  60
  61 // ----------------------------------------------------------------------------
  62 // wxMetafileRefData
  63 // ----------------------------------------------------------------------------
  64
  65 /*
  66  * Metafiles
  67  * Currently, the only purpose for making a metafile is to put
  68  * it on the clipboard.
  69  */
  70
  71 wxMetafileRefData::wxMetafileRefData()
  72 {
  73     m_metafile = 0;
  74     m_windowsMappingMode = wxMM_ANISOTROPIC;
  75     m_width = m_height = 0;
  76 }
  77
  78 wxMetafileRefData::~wxMetafileRefData()
  79 {
  80     if (m_metafile)
  81     {
  82         DeleteMetaFile((HMETAFILE) m_metafile);
  83         m_metafile = 0;
  84     }
  85 }
  86
  87 // ----------------------------------------------------------------------------
  88 // wxMetafile
  89 // ----------------------------------------------------------------------------
  90
  91 wxMetafile::wxMetafile(const wxString& file)
  92 {
  93     m_refData = new wxMetafileRefData;
  94
  95     M_METAFILEDATA->m_windowsMappingMode = wxMM_ANISOTROPIC;
  96     M_METAFILEDATA->m_metafile = 0;
  97     if (!file.empty())
  98         M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
  99 }
 100
 101 wxMetafile::~wxMetafile()
 102 {
 103 }
 104
 105 bool wxMetafile::SetClipboard(int width, int height)
 106 {
 107 #if !wxUSE_CLIPBOARD
 108     return false;
 109 #else
 110     if (!m_refData)
 111         return false;
 112
 113     bool alreadyOpen = wxClipboardOpen();
 114     if (!alreadyOpen)
 115     {
 116         wxOpenClipboard();
 117         if (!wxEmptyClipboard())
 118             return false;
 119     }
 120     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
 121     if (!alreadyOpen)
 122         wxCloseClipboard();
 123
 124     return success;
 125 #endif
 126 }
 127
 128 bool wxMetafile::Play(wxDC *dc)
 129 {
 130     if (!m_refData)
 131         return false;
 132
 133     dc->BeginDrawing();
 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     dc->EndDrawing();
 145
 146     return true;
 147 }
 148
 149 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 150 {
 151     if (!m_refData)
 152         m_refData = new wxMetafileRefData;
 153
 154     M_METAFILEDATA->m_metafile = mf;
 155 }
 156
 157 void wxMetafile::SetWindowsMappingMode(int mm)
 158 {
 159     if (!m_refData)
 160         m_refData = new wxMetafileRefData;
 161
 162     M_METAFILEDATA->m_windowsMappingMode = mm;
 163 }
 164
 165 // ----------------------------------------------------------------------------
 166 // Metafile device context
 167 // ----------------------------------------------------------------------------
 168
 169 // Original constructor that does not takes origin and extent. If you use this,
 170 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 171 wxMetafileDC::wxMetafileDC(const wxString& file)
 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 (!file.IsNull() && wxFileExists(file))
 181         wxRemoveFile(file);
 182
 183     if (!file.IsNull() && (file != wxEmptyString))
 184         m_hDC = (WXHDC) CreateMetaFile(file);
 185     else
 186         m_hDC = (WXHDC) CreateMetaFile(NULL);
 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 wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 199 {
 200     m_minX = 10000;
 201     m_minY = 10000;
 202     m_maxX = -10000;
 203     m_maxY = -10000;
 204     if ( !file.IsEmpty() && wxFileExists(file))
 205         wxRemoveFile(file);
 206     m_hDC = (WXHDC) CreateMetaFile(file);
 207
 208     m_ok = true;
 209
 210     ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 211     ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 212
 213     // Actual Windows mapping mode, for future reference.
 214     m_windowsMappingMode = wxMM_ANISOTROPIC;
 215
 216     SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 217 }
 218
 219 wxMetafileDC::~wxMetafileDC()
 220 {
 221     m_hDC = 0;
 222 }
 223
 224 void wxMetafileDC::GetTextExtent(const wxString& string, long *x, long *y,
 225                                  long *descent, long *externalLeading, wxFont *theFont, bool WXUNUSED(use16bit)) const
 226 {
 227     wxFont *fontToUse = theFont;
 228     if (!fontToUse)
 229         fontToUse = (wxFont*) &m_font;
 230
 231     HDC dc = GetDC(NULL);
 232
 233     SIZE sizeRect;
 234     TEXTMETRIC tm;
 235     GetTextExtentPoint(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 236     GetTextMetrics(dc, &tm);
 237
 238     ReleaseDC(NULL, dc);
 239
 240     if ( x )
 241         *x = sizeRect.cx;
 242     if ( y )
 243         *y = sizeRect.cy;
 244     if ( descent )
 245         *descent = tm.tmDescent;
 246     if ( externalLeading )
 247         *externalLeading = tm.tmExternalLeading;
 248 }
 249
 250 wxMetafile *wxMetafileDC::Close()
 251 {
 252     SelectOldObjects(m_hDC);
 253     HANDLE mf = CloseMetaFile((HDC) m_hDC);
 254     m_hDC = 0;
 255     if (mf)
 256     {
 257         wxMetafile *wx_mf = new wxMetafile;
 258         wx_mf->SetHMETAFILE((WXHANDLE) mf);
 259         wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 260         return wx_mf;
 261     }
 262     return NULL;
 263 }
 264
 265 void wxMetafileDC::SetMapMode(int mode)
 266 {
 267     m_mappingMode = mode;
 268
 269     //  int pixel_width = 0;
 270     //  int pixel_height = 0;
 271     //  int mm_width = 0;
 272     //  int mm_height = 0;
 273
 274     float mm2pixelsX = 10.0;
 275     float mm2pixelsY = 10.0;
 276
 277     switch (mode)
 278     {
 279         case wxMM_TWIPS:
 280             {
 281                 m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 282                 m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 283                 break;
 284             }
 285         case wxMM_POINTS:
 286             {
 287                 m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 288                 m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 289                 break;
 290             }
 291         case wxMM_METRIC:
 292             {
 293                 m_logicalScaleX = mm2pixelsX;
 294                 m_logicalScaleY = mm2pixelsY;
 295                 break;
 296             }
 297         case wxMM_LOMETRIC:
 298             {
 299                 m_logicalScaleX = (float)(mm2pixelsX/10.0);
 300                 m_logicalScaleY = (float)(mm2pixelsY/10.0);
 301                 break;
 302             }
 303         default:
 304         case wxMM_TEXT:
 305             {
 306                 m_logicalScaleX = 1.0;
 307                 m_logicalScaleY = 1.0;
 308                 break;
 309             }
 310     }
 311 }
 312
 313 // ----------------------------------------------------------------------------
 314 // wxMakeMetafilePlaceable
 315 // ----------------------------------------------------------------------------
 316
 317 #ifdef __WIN32__
 318 struct RECT32
 319 {
 320   short left;
 321   short top;
 322   short right;
 323   short bottom;
 324 };
 325
 326 struct mfPLACEABLEHEADER {
 327     DWORD    key;
 328     short    hmf;
 329     RECT32    bbox;
 330     WORD    inch;
 331     DWORD    reserved;
 332     WORD    checksum;
 333 };
 334 #else
 335 struct mfPLACEABLEHEADER {
 336     DWORD    key;
 337     HANDLE    hmf;
 338     RECT    bbox;
 339     WORD    inch;
 340     DWORD    reserved;
 341     WORD    checksum;
 342 };
 343 #endif
 344
 345 /*
 346  * Pass filename of existing non-placeable metafile, and bounding box.
 347  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 348  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 349  *
 350  */
 351
 352 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 353 {
 354     return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
 355 }
 356
 357 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 358 {
 359     // I'm not sure if this is the correct way of suggesting a scale
 360     // to the client application, but it's the only way I can find.
 361     int unitsPerInch = (int)(576/scale);
 362
 363     mfPLACEABLEHEADER header;
 364     header.key = 0x9AC6CDD7L;
 365     header.hmf = 0;
 366     header.bbox.left = (int)(x1);
 367     header.bbox.top = (int)(y1);
 368     header.bbox.right = (int)(x2);
 369     header.bbox.bottom = (int)(y2);
 370     header.inch = unitsPerInch;
 371     header.reserved = 0;
 372
 373     // Calculate checksum
 374     WORD *p;
 375     mfPLACEABLEHEADER *pMFHead = &header;
 376     for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 377             p < (WORD *)&pMFHead ->checksum; ++p)
 378         pMFHead ->checksum ^= *p;
 379
 380     FILE *fd = wxFopen(filename.fn_str(), _T("rb"));
 381     if (!fd) return false;
 382
 383     wxChar tempFileBuf[256];
 384     wxGetTempFileName(wxT("mf"), tempFileBuf);
 385     FILE *fHandle = wxFopen(wxFNCONV(tempFileBuf), _T("wb"));
 386     if (!fHandle)
 387         return false;
 388     fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 389
 390     // Calculate origin and extent
 391     int originX = x1;
 392     int originY = y1;
 393     int extentX = x2 - x1;
 394     int extentY = (y2 - y1);
 395
 396     // Read metafile header and write
 397     METAHEADER metaHeader;
 398     fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 399
 400     if (useOriginAndExtent)
 401         metaHeader.mtSize += 15;
 402     else
 403         metaHeader.mtSize += 5;
 404
 405     fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 406
 407     // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 408     char modeBuffer[8];
 409     char originBuffer[10];
 410     char extentBuffer[10];
 411     METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 412
 413     METARECORD *originRecord = (METARECORD *)&originBuffer;
 414     METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 415
 416     modeRecord->rdSize = 4;
 417     modeRecord->rdFunction = META_SETMAPMODE;
 418     modeRecord->rdParm[0] = MM_ANISOTROPIC;
 419
 420     originRecord->rdSize = 5;
 421     originRecord->rdFunction = META_SETWINDOWORG;
 422     originRecord->rdParm[0] = originY;
 423     originRecord->rdParm[1] = originX;
 424
 425     extentRecord->rdSize = 5;
 426     extentRecord->rdFunction = META_SETWINDOWEXT;
 427     extentRecord->rdParm[0] = extentY;
 428     extentRecord->rdParm[1] = extentX;
 429
 430     fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 431
 432     if (useOriginAndExtent)
 433     {
 434         fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 435         fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 436     }
 437
 438     int ch = -2;
 439     while (ch != EOF)
 440     {
 441         ch = getc(fd);
 442         if (ch != EOF)
 443         {
 444             putc(ch, fHandle);
 445         }
 446     }
 447     fclose(fHandle);
 448     fclose(fd);
 449     wxRemoveFile(filename);
 450     wxCopyFile(tempFileBuf, filename);
 451     wxRemoveFile(tempFileBuf);
 452     return true;
 453 }
 454
 455
 456 #if wxUSE_DRAG_AND_DROP
 457
 458 // ----------------------------------------------------------------------------
 459 // wxMetafileDataObject
 460 // ----------------------------------------------------------------------------
 461
 462 size_t wxMetafileDataObject::GetDataSize() const
 463 {
 464     return sizeof(METAFILEPICT);
 465 }
 466
 467 bool wxMetafileDataObject::GetDataHere(void *buf) const
 468 {
 469     METAFILEPICT *mfpict = (METAFILEPICT *)buf;
 470     const wxMetafile& mf = GetMetafile();
 471
 472     wxCHECK_MSG( mf.GetHMETAFILE(), false, _T("copying invalid metafile") );
 473
 474     // doesn't seem to work with any other mapping mode...
 475     mfpict->mm   = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
 476     mfpict->xExt = mf.GetWidth();
 477     mfpict->yExt = mf.GetHeight();
 478
 479     // transform the picture size to HIMETRIC units (0.01mm) - as we don't know
 480     // what DC the picture will be rendered to, use the default display one
 481     PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
 482
 483     mfpict->hMF  = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);
 484
 485     return true;
 486 }
 487
 488 bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 489 {
 490     const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;
 491
 492     wxMetafile mf;
 493     mf.SetWindowsMappingMode(mfpict->mm);
 494
 495     LONG w = mfpict->xExt,
 496          h = mfpict->yExt;
 497     if ( mfpict->mm == MM_ANISOTROPIC )
 498     {
 499         // in this case xExt and yExt contain suggested size in HIMETRIC units
 500         // (0.01 mm) - transform this to something more reasonable (pixels)
 501         HIMETRICToPixel(&w, &h);
 502     }
 503
 504     mf.SetWidth(w);
 505     mf.SetHeight(h);
 506     mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);
 507
 508     wxCHECK_MSG( mfpict->hMF, false, _T("pasting invalid metafile") );
 509
 510     SetMetafile(mf);
 511
 512     return true;
 513 }
 514
 515 #endif // wxUSE_DRAG_AND_DROP
 516
 517 #endif // wxUSE_METAFILE
 518