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 IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
  44 IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
  45
  46 /*
  47  * Metafiles
  48  * Currently, the only purpose for making a metafile is to put
  49  * it on the clipboard.
  50  */
  51
  52 wxMetafileRefData::wxMetafileRefData(void)
  53 {
  54     m_metafile = 0;
  55     m_windowsMappingMode = wxMM_ANISOTROPIC;
  56 }
  57
  58 wxMetafileRefData::~wxMetafileRefData(void)
  59 {
  60     if (m_metafile)
  61     {
  62         DeleteMetaFile((HMETAFILE) m_metafile);
  63         m_metafile = 0;
  64     }
  65 }
  66
  67 wxMetafile::wxMetafile(const wxString& file)
  68 {
  69     m_refData = new wxMetafileRefData;
  70
  71     M_METAFILEDATA->m_windowsMappingMode = wxMM_ANISOTROPIC;
  72     M_METAFILEDATA->m_metafile = 0;
  73     if (!file.IsNull() && (file.Cmp(wxT("")) == 0))
  74         M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
  75 }
  76
  77 wxMetafile::~wxMetafile(void)
  78 {
  79 }
  80
  81 bool wxMetafile::SetClipboard(int width, int height)
  82 {
  83     if (!m_refData)
  84         return FALSE;
  85
  86     bool alreadyOpen=wxClipboardOpen();
  87     if (!alreadyOpen)
  88     {
  89         wxOpenClipboard();
  90         if (!wxEmptyClipboard()) return FALSE;
  91     }
  92     bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
  93     if (!alreadyOpen) wxCloseClipboard();
  94     return (bool) success;
  95 }
  96
  97 bool wxMetafile::Play(wxDC *dc)
  98 {
  99     if (!m_refData)
 100         return FALSE;
 101
 102     dc->BeginDrawing();
 103
 104     if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
 105         PlayMetaFile((HDC) dc->GetHDC(), (HMETAFILE) M_METAFILEDATA->m_metafile);
 106
 107     dc->EndDrawing();
 108
 109     return TRUE;
 110 }
 111
 112 void wxMetafile::SetHMETAFILE(WXHANDLE mf)
 113 {
 114     if (m_refData)
 115         m_refData = new wxMetafileRefData;
 116
 117     M_METAFILEDATA->m_metafile = mf;
 118 }
 119
 120 void wxMetafile::SetWindowsMappingMode(int mm)
 121 {
 122     if (m_refData)
 123         m_refData = new wxMetafileRefData;
 124
 125     M_METAFILEDATA->m_windowsMappingMode = mm;
 126 }
 127
 128 /*
 129  * Metafile device context
 130  *
 131  */
 132
 133 // Original constructor that does not takes origin and extent. If you use this,
 134 // *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
 135 wxMetafileDC::wxMetafileDC(const wxString& file)
 136 {
 137   m_metaFile = NULL;
 138   m_minX = 10000;
 139   m_minY = 10000;
 140   m_maxX = -10000;
 141   m_maxY = -10000;
 142 //  m_title = NULL;
 143
 144   if (!file.IsNull() && wxFileExists(file))
 145     wxRemoveFile(file);
 146
 147   if (!file.IsNull() && (file != wxT("")))
 148     m_hDC = (WXHDC) CreateMetaFile(file);
 149   else
 150     m_hDC = (WXHDC) CreateMetaFile(NULL);
 151
 152   m_ok = (m_hDC != (WXHDC) 0) ;
 153
 154   // Actual Windows mapping mode, for future reference.
 155   m_windowsMappingMode = wxMM_TEXT;
 156
 157   SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 158 }
 159
 160 // New constructor that takes origin and extent. If you use this, don't
 161 // give origin/extent arguments to wxMakeMetafilePlaceable.
 162 wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 163 {
 164   m_minX = 10000;
 165   m_minY = 10000;
 166   m_maxX = -10000;
 167   m_maxY = -10000;
 168   if (file != wxT("") && wxFileExists(file)) wxRemoveFile(file);
 169   m_hDC = (WXHDC) CreateMetaFile(file);
 170
 171   m_ok = TRUE;
 172
 173   ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 174   ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 175
 176   // Actual Windows mapping mode, for future reference.
 177   m_windowsMappingMode = wxMM_ANISOTROPIC;
 178
 179   SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 180 }
 181
 182 wxMetafileDC::~wxMetafileDC(void)
 183 {
 184   m_hDC = 0;
 185 }
 186
 187 void wxMetafileDC::GetTextExtent(const wxString& string, long *x, long *y,
 188                                  long *descent, long *externalLeading, wxFont *theFont, bool use16bit) const
 189 {
 190   wxFont *fontToUse = theFont;
 191   if (!fontToUse)
 192     fontToUse = (wxFont*) &m_font;
 193
 194   HDC dc = GetDC(NULL);
 195
 196   SIZE sizeRect;
 197   TEXTMETRIC tm;
 198   GetTextExtentPoint(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 199   GetTextMetrics(dc, &tm);
 200
 201   ReleaseDC(NULL, dc);
 202
 203   if ( x )
 204       *x = sizeRect.cx;
 205   if ( y )
 206     *y = sizeRect.cy;
 207   if ( descent )
 208       *descent = tm.tmDescent;
 209   if ( externalLeading )
 210       *externalLeading = tm.tmExternalLeading;
 211 }
 212
 213 wxMetafile *wxMetafileDC::Close(void)
 214 {
 215   SelectOldObjects(m_hDC);
 216   HANDLE mf = CloseMetaFile((HDC) m_hDC);
 217   m_hDC = 0;
 218   if (mf)
 219   {
 220     wxMetafile *wx_mf = new wxMetafile;
 221     wx_mf->SetHMETAFILE((WXHANDLE) mf);
 222     wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 223     return wx_mf;
 224   }
 225   return NULL;
 226 }
 227
 228 void wxMetafileDC::SetMapMode(int mode)
 229 {
 230   m_mappingMode = mode;
 231
 232 //  int pixel_width = 0;
 233 //  int pixel_height = 0;
 234 //  int mm_width = 0;
 235 //  int mm_height = 0;
 236
 237   float mm2pixelsX = 10.0;
 238   float mm2pixelsY = 10.0;
 239
 240   switch (mode)
 241   {
 242     case wxMM_TWIPS:
 243     {
 244       m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 245       m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 246       break;
 247     }
 248     case wxMM_POINTS:
 249     {
 250       m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 251       m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 252       break;
 253     }
 254     case wxMM_METRIC:
 255     {
 256       m_logicalScaleX = mm2pixelsX;
 257       m_logicalScaleY = mm2pixelsY;
 258       break;
 259     }
 260     case wxMM_LOMETRIC:
 261     {
 262       m_logicalScaleX = (float)(mm2pixelsX/10.0);
 263       m_logicalScaleY = (float)(mm2pixelsY/10.0);
 264       break;
 265     }
 266     default:
 267     case wxMM_TEXT:
 268     {
 269       m_logicalScaleX = 1.0;
 270       m_logicalScaleY = 1.0;
 271       break;
 272     }
 273   }
 274   m_windowExtX = 100;
 275   m_windowExtY = 100;
 276 }
 277
 278 #ifdef __WIN32__
 279 struct RECT32
 280 {
 281   short left;
 282   short top;
 283   short right;
 284   short bottom;
 285 };
 286
 287 struct mfPLACEABLEHEADER {
 288         DWORD   key;
 289         short   hmf;
 290         RECT32  bbox;
 291         WORD    inch;
 292         DWORD   reserved;
 293         WORD    checksum;
 294 };
 295 #else
 296 struct mfPLACEABLEHEADER {
 297         DWORD   key;
 298         HANDLE  hmf;
 299         RECT    bbox;
 300         WORD    inch;
 301         DWORD   reserved;
 302         WORD    checksum;
 303 };
 304 #endif
 305
 306 /*
 307  * Pass filename of existing non-placeable metafile, and bounding box.
 308  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 309  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 310  *
 311  */
 312
 313 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 314 {
 315   return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, FALSE);
 316 }
 317
 318 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 319 {
 320   // I'm not sure if this is the correct way of suggesting a scale
 321   // to the client application, but it's the only way I can find.
 322   int unitsPerInch = (int)(576/scale);
 323
 324   mfPLACEABLEHEADER header;
 325   header.key = 0x9AC6CDD7L;
 326   header.hmf = 0;
 327   header.bbox.left = (int)(x1);
 328   header.bbox.top = (int)(y1);
 329   header.bbox.right = (int)(x2);
 330   header.bbox.bottom = (int)(y2);
 331   header.inch = unitsPerInch;
 332   header.reserved = 0;
 333
 334   // Calculate checksum
 335   WORD *p;
 336   mfPLACEABLEHEADER *pMFHead = &header;
 337   for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 338         p < (WORD *)&pMFHead ->checksum; ++p)
 339        pMFHead ->checksum ^= *p;
 340
 341   FILE *fd = fopen(filename.fn_str(), "rb");
 342   if (!fd) return FALSE;
 343
 344   wxChar tempFileBuf[256];
 345   wxGetTempFileName(wxT("mf"), tempFileBuf);
 346   FILE *fHandle = fopen(wxConvFile.cWX2MB(tempFileBuf), "wb");
 347   if (!fHandle)
 348     return FALSE;
 349   fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 350
 351   // Calculate origin and extent
 352   int originX = x1;
 353   int originY = y1;
 354   int extentX = x2 - x1;
 355   int extentY = (y2 - y1);
 356
 357   // Read metafile header and write
 358   METAHEADER metaHeader;
 359   fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 360
 361   if (useOriginAndExtent)
 362     metaHeader.mtSize += 15;
 363   else
 364     metaHeader.mtSize += 5;
 365
 366   fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 367
 368   // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 369   char modeBuffer[8];
 370   char originBuffer[10];
 371   char extentBuffer[10];
 372   METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 373
 374   METARECORD *originRecord = (METARECORD *)&originBuffer;
 375   METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 376
 377   modeRecord->rdSize = 4;
 378   modeRecord->rdFunction = META_SETMAPMODE;
 379   modeRecord->rdParm[0] = MM_ANISOTROPIC;
 380
 381   originRecord->rdSize = 5;
 382   originRecord->rdFunction = META_SETWINDOWORG;
 383   originRecord->rdParm[0] = originY;
 384   originRecord->rdParm[1] = originX;
 385
 386   extentRecord->rdSize = 5;
 387   extentRecord->rdFunction = META_SETWINDOWEXT;
 388   extentRecord->rdParm[0] = extentY;
 389   extentRecord->rdParm[1] = extentX;
 390
 391   fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 392
 393   if (useOriginAndExtent)
 394   {
 395     fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 396     fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 397   }
 398
 399   int ch = -2;
 400   while (ch != EOF)
 401   {
 402     ch = getc(fd);
 403     if (ch != EOF)
 404     {
 405       putc(ch, fHandle);
 406     }
 407   }
 408   fclose(fHandle);
 409   fclose(fd);
 410   wxRemoveFile(filename);
 411   wxCopyFile(tempFileBuf, filename);
 412   wxRemoveFile(tempFileBuf);
 413   return TRUE;
 414 }
 415
 416 #endif // wxUSE_METAFILE
 417