src/msw/metafile.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        metafile.cpp
   3 // Purpose:     wxMetafileDC etc.
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "metafile.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/setup.h"
  25 #endif
  26
  27 #if wxUSE_METAFILE
  28
  29 #ifndef WX_PRECOMP
  30 #include "wx/utils.h"
  31 #include "wx/app.h"
  32 #endif
  33
  34 #include "wx/metafile.h"
  35 #include "wx/clipbrd.h"
  36 #include "wx/msw/private.h"
  37
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 extern bool wxClipboardIsOpen;
  42
  43 #if !USE_SHARED_LIBRARY
  44 IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
  45 IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
  46 #endif
  47
  48 /*
  49  * Metafiles
  50  * Currently, the only purpose for making a metafile is to put
  51  * it on the clipboard.
  52  */
  53
  54 wxMetafileRefData::wxMetafileRefData(void)
  55 {
  56     m_metafile = 0;
  57     m_windowsMappingMode = MM_ANISOTROPIC;
  58 }
  59
  60 wxMetafileRefData::~wxMetafileRefData(void)
  61 {
  62     if (m_metafile)
  63     {
  64         DeleteMetaFile((HMETAFILE) m_metafile);
  65         m_metafile = 0;
  66     }
  67 }
  68
  69 wxMetafile::wxMetafile(const wxString& file)
  70 {
  71     m_refData = new wxMetafileRefData;
  72
  73     M_METAFILEDATA->m_windowsMappingMode = MM_ANISOTROPIC;
  74     M_METAFILEDATA->m_metafile = 0;
  75     if (!file.IsNull() && (file.Cmp("") == 0))
  76         M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
  77 }
  78
  79 wxMetafile::~wxMetafile(void)
  80 {
  81 }
  82
  83 bool wxMetafile::SetClipboard(int width, int height)
  84 {
  85     if (!m_refData)
  86         return FALSE;
  87
  88     bool alreadyOpen=wxClipboardOpen();
  89     if (!alreadyOpen)
  90     {
  91         wxOpenClipboard();
  92         if (!wxEmptyClipboard()) return FALSE;
  93     }
  94     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
  95     if (!alreadyOpen) wxCloseClipboard();
  96     return (bool) success;
  97 }
  98
  99 bool wxMetafile::Play(wxDC *dc)
 100 {
 101     if (!m_refData)
 102         return FALSE;
 103
 104     dc->BeginDrawing();
 105
 106     if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
 107         PlayMetaFile((HDC) dc->GetHDC(), (HMETAFILE) M_METAFILEDATA->m_metafile);
 108
 109     dc->EndDrawing();
 110
 111     return TRUE;
 112 }
 113
 114 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 115 {
 116     if (m_refData)
 117         m_refData = new wxMetafileRefData;
 118
 119     M_METAFILEDATA->m_metafile = mf;
 120 }
 121
 122 void wxMetafile::SetWindowsMappingMode(int mm)
 123 {
 124     if (m_refData)
 125         m_refData = new wxMetafileRefData;
 126
 127     M_METAFILEDATA->m_windowsMappingMode = mm;
 128 }
 129
 130 /*
 131  * Metafile device context
 132  *
 133  */
 134
 135 // Original constructor that does not takes origin and extent. If you use this,
 136 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 137 wxMetafileDC::wxMetafileDC(const wxString& file)
 138 {
 139   m_metaFile = NULL;
 140   m_minX = 10000;
 141   m_minY = 10000;
 142   m_maxX = -10000;
 143   m_maxY = -10000;
 144 //  m_title = NULL;
 145
 146   if (!file.IsNull() && wxFileExists(file))
 147     wxRemoveFile(file);
 148
 149   if (!file.IsNull() && (file != ""))
 150     m_hDC = (WXHDC) CreateMetaFile(file);
 151   else
 152     m_hDC = (WXHDC) CreateMetaFile(NULL);
 153
 154   m_ok = (m_hDC != (WXHDC) 0) ;
 155
 156   // Actual Windows mapping mode, for future reference.
 157   m_windowsMappingMode = MM_TEXT;
 158
 159   SetMapMode(MM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 160 }
 161
 162 // New constructor that takes origin and extent. If you use this, don't
 163 // give origin/extent arguments to wxMakeMetafilePlaceable.
 164 wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 165 {
 166   m_minX = 10000;
 167   m_minY = 10000;
 168   m_maxX = -10000;
 169   m_maxY = -10000;
 170   if (file != "" && wxFileExists(file)) wxRemoveFile(file);
 171   m_hDC = (WXHDC) CreateMetaFile(file);
 172
 173   m_ok = TRUE;
 174
 175   ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 176   ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 177
 178   // Actual Windows mapping mode, for future reference.
 179   m_windowsMappingMode = MM_ANISOTROPIC;
 180
 181   SetMapMode(MM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 182 }
 183
 184 wxMetafileDC::~wxMetafileDC(void)
 185 {
 186   m_hDC = 0;
 187 }
 188
 189 void wxMetafileDC::GetTextExtent(const wxString& string, long *x, long *y,
 190                                  long *descent, long *externalLeading, wxFont *theFont, bool use16bit) const
 191 {
 192   wxFont *fontToUse = theFont;
 193   if (!fontToUse)
 194     fontToUse = (wxFont*) &m_font;
 195
 196   HDC dc = GetDC(NULL);
 197
 198   SIZE sizeRect;
 199   TEXTMETRIC tm;
 200   GetTextExtentPoint(dc, (char *)(const char *) string, strlen((char *)(const char *) string), &sizeRect);
 201   GetTextMetrics(dc, &tm);
 202
 203   ReleaseDC(NULL, dc);
 204
 205   *x = XDEV2LOGREL(sizeRect.cx);
 206   *y = YDEV2LOGREL(sizeRect.cy);
 207   if (descent) *descent = tm.tmDescent;
 208   if (externalLeading) *externalLeading = tm.tmExternalLeading;
 209 }
 210
 211 wxMetafile *wxMetafileDC::Close(void)
 212 {
 213   SelectOldObjects(m_hDC);
 214   HANDLE mf = CloseMetaFile((HDC) m_hDC);
 215   m_hDC = 0;
 216   if (mf)
 217   {
 218     wxMetafile *wx_mf = new wxMetafile;
 219     wx_mf->SetHMETAFILE((WXHANDLE) mf);
 220     wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 221     return wx_mf;
 222   }
 223   return NULL;
 224 }
 225
 226 void wxMetafileDC::SetMapMode(int mode)
 227 {
 228   m_mappingMode = mode;
 229
 230 //  int pixel_width = 0;
 231 //  int pixel_height = 0;
 232 //  int mm_width = 0;
 233 //  int mm_height = 0;
 234
 235   float mm2pixelsX = 10.0;
 236   float mm2pixelsY = 10.0;
 237
 238   switch (mode)
 239   {
 240     case MM_TWIPS:
 241     {
 242       m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 243       m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 244       break;
 245     }
 246     case MM_POINTS:
 247     {
 248       m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 249       m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 250       break;
 251     }
 252     case MM_METRIC:
 253     {
 254       m_logicalScaleX = mm2pixelsX;
 255       m_logicalScaleY = mm2pixelsY;
 256       break;
 257     }
 258     case MM_LOMETRIC:
 259     {
 260       m_logicalScaleX = (float)(mm2pixelsX/10.0);
 261       m_logicalScaleY = (float)(mm2pixelsY/10.0);
 262       break;
 263     }
 264     default:
 265     case MM_TEXT:
 266     {
 267       m_logicalScaleX = 1.0;
 268       m_logicalScaleY = 1.0;
 269       break;
 270     }
 271   }
 272   m_windowExtX = 100;
 273   m_windowExtY = 100;
 274 }
 275
 276 #ifdef __WIN32__
 277 struct RECT32
 278 {
 279   short left;
 280   short top;
 281   short right;
 282   short bottom;
 283 };
 284
 285 struct mfPLACEABLEHEADER {
 286         DWORD   key;
 287         short   hmf;
 288         RECT32  bbox;
 289         WORD    inch;
 290         DWORD   reserved;
 291         WORD    checksum;
 292 };
 293 #else
 294 struct mfPLACEABLEHEADER {
 295         DWORD   key;
 296         HANDLE  hmf;
 297         RECT    bbox;
 298         WORD    inch;
 299         DWORD   reserved;
 300         WORD    checksum;
 301 };
 302 #endif
 303
 304 /*
 305  * Pass filename of existing non-placeable metafile, and bounding box.
 306  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 307  * and sets the window origin and extent to mimic the MM_TEXT mapping mode.
 308  *
 309  */
 310
 311 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 312 {
 313   return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, FALSE);
 314 }
 315
 316 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 317 {
 318   // I'm not sure if this is the correct way of suggesting a scale
 319   // to the client application, but it's the only way I can find.
 320   int unitsPerInch = (int)(576/scale);
 321
 322   mfPLACEABLEHEADER header;
 323   header.key = 0x9AC6CDD7L;
 324   header.hmf = 0;
 325   header.bbox.left = (int)(x1);
 326   header.bbox.top = (int)(y1);
 327   header.bbox.right = (int)(x2);
 328   header.bbox.bottom = (int)(y2);
 329   header.inch = unitsPerInch;
 330   header.reserved = 0;
 331
 332   // Calculate checksum
 333   WORD *p;
 334   mfPLACEABLEHEADER *pMFHead = &header;
 335   for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 336         p < (WORD *)&pMFHead ->checksum; ++p)
 337        pMFHead ->checksum ^= *p;
 338
 339   FILE *fd = fopen((char *)(const char *)filename, "rb");
 340   if (!fd) return FALSE;
 341
 342   char tempFileBuf[256];
 343   wxGetTempFileName("mf", tempFileBuf);
 344   FILE *fHandle = fopen(tempFileBuf, "wb");
 345   if (!fHandle)
 346     return FALSE;
 347   fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 348
 349   // Calculate origin and extent
 350   int originX = x1;
 351   int originY = y1;
 352   int extentX = x2 - x1;
 353   int extentY = (y2 - y1);
 354
 355   // Read metafile header and write
 356   METAHEADER metaHeader;
 357   fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 358
 359   if (useOriginAndExtent)
 360     metaHeader.mtSize += 15;
 361   else
 362     metaHeader.mtSize += 5;
 363
 364   fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 365
 366   // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 367   char modeBuffer[8];
 368   char originBuffer[10];
 369   char extentBuffer[10];
 370   METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 371
 372   METARECORD *originRecord = (METARECORD *)&originBuffer;
 373   METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 374
 375   modeRecord->rdSize = 4;
 376   modeRecord->rdFunction = META_SETMAPMODE;
 377   modeRecord->rdParm[0] = MM_ANISOTROPIC;
 378
 379   originRecord->rdSize = 5;
 380   originRecord->rdFunction = META_SETWINDOWORG;
 381   originRecord->rdParm[0] = originY;
 382   originRecord->rdParm[1] = originX;
 383
 384   extentRecord->rdSize = 5;
 385   extentRecord->rdFunction = META_SETWINDOWEXT;
 386   extentRecord->rdParm[0] = extentY;
 387   extentRecord->rdParm[1] = extentX;
 388
 389   fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 390
 391   if (useOriginAndExtent)
 392   {
 393     fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 394     fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 395   }
 396
 397   int ch = -2;
 398   while (ch != EOF)
 399   {
 400     ch = getc(fd);
 401     if (ch != EOF)
 402     {
 403       putc(ch, fHandle);
 404     }
 405   }
 406   fclose(fHandle);
 407   fclose(fd);
 408   wxRemoveFile(filename);
 409   wxCopyFile(tempFileBuf, filename);
 410   wxRemoveFile(tempFileBuf);
 411   return TRUE;
 412 }
 413
 414 #endif // wxUSE_METAFILE
 415