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 USE_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 - Windows 3.1 only
  50  * Currently, the only purpose for making a metafile is to put
  51  * it on the clipboard.
  52  */
  53
  54 wxMetaFile::wxMetaFile(const wxString& file)
  55 {
  56   m_windowsMappingMode = MM_ANISOTROPIC;
  57   m_metaFile = 0;
  58   if (!file.IsNull() && file == "")
  59     m_metaFile = (WXHANDLE) GetMetaFile(file);
  60 }
  61
  62 wxMetaFile::~wxMetaFile(void)
  63 {
  64   if (m_metaFile)
  65     { DeleteMetaFile((HMETAFILE) m_metaFile); m_metaFile = 0; }
  66 }
  67
  68 bool wxMetaFile::SetClipboard(int width, int height)
  69 {
  70   bool alreadyOpen=wxClipboardOpen();
  71   if (!alreadyOpen)
  72   {
  73     wxOpenClipboard();
  74     if (!wxEmptyClipboard()) return FALSE;
  75   }
  76   bool success = wxSetClipboardData(wxDF_METAFILE,this, width,height);
  77   if (!alreadyOpen) wxCloseClipboard();
  78   return (bool) success;
  79 }
  80
  81 bool wxMetaFile::Play(wxDC *dc)
  82 {
  83   dc->BeginDrawing();
  84
  85   if (dc->GetHDC() && m_metaFile)
  86     PlayMetaFile((HDC) dc->GetHDC(), (HMETAFILE) m_metaFile);
  87
  88   dc->EndDrawing();
  89
  90   return TRUE;
  91 }
  92
  93 /*
  94  * Metafile device context
  95  *
  96  */
  97
  98 // Original constructor that does not takes origin and extent. If you use this,
  99 // *DO* give origin/extent arguments to wxMakeMetaFilePlaceable.
 100 wxMetaFileDC::wxMetaFileDC(const wxString& file)
 101 {
 102   m_metaFile = NULL;
 103   m_minX = 10000;
 104   m_minY = 10000;
 105   m_maxX = -10000;
 106   m_maxY = -10000;
 107 //  m_title = NULL;
 108
 109   if (!file.IsNull() && wxFileExists(file))
 110     wxRemoveFile(file);
 111   m_hDC = (WXHDC) CreateMetaFile(file);
 112
 113   m_ok = TRUE;
 114
 115   // Actual Windows mapping mode, for future reference.
 116   m_windowsMappingMode = MM_TEXT;
 117
 118   SetMapMode(MM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 119 }
 120
 121 // New constructor that takes origin and extent. If you use this, don't
 122 // give origin/extent arguments to wxMakeMetaFilePlaceable.
 123 wxMetaFileDC::wxMetaFileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
 124 {
 125   m_minX = 10000;
 126   m_minY = 10000;
 127   m_maxX = -10000;
 128   m_maxY = -10000;
 129   if (file != "" && wxFileExists(file)) wxRemoveFile(file);
 130   m_hDC = (WXHDC) CreateMetaFile(file);
 131
 132   m_ok = TRUE;
 133
 134   ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
 135   ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
 136
 137   // Actual Windows mapping mode, for future reference.
 138   m_windowsMappingMode = MM_ANISOTROPIC;
 139
 140   SetMapMode(MM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
 141 }
 142
 143 wxMetaFileDC::~wxMetaFileDC(void)
 144 {
 145   m_hDC = 0;
 146 }
 147
 148 void wxMetaFileDC::GetTextExtent(const wxString& string, float *x, float *y,
 149                                  float *descent, float *externalLeading, wxFont *theFont, bool use16bit)
 150 {
 151   wxFont *fontToUse = theFont;
 152   if (!fontToUse)
 153     fontToUse = &m_font;
 154
 155   HDC dc = GetDC(NULL);
 156
 157   SIZE sizeRect;
 158   TEXTMETRIC tm;
 159   GetTextExtentPoint(dc, (char *)(const char *) string, strlen((char *)(const char *) string), &sizeRect);
 160   GetTextMetrics(dc, &tm);
 161
 162   ReleaseDC(NULL, dc);
 163
 164   *x = (float)XDEV2LOGREL(sizeRect.cx);
 165   *y = (float)YDEV2LOGREL(sizeRect.cy);
 166   if (descent) *descent = (float)tm.tmDescent;
 167   if (externalLeading) *externalLeading = (float)tm.tmExternalLeading;
 168 }
 169
 170 wxMetaFile *wxMetaFileDC::Close(void)
 171 {
 172   SelectOldObjects(m_hDC);
 173   HANDLE mf = CloseMetaFile((HDC) m_hDC);
 174   m_hDC = 0;
 175   if (mf)
 176   {
 177     wxMetaFile *wx_mf = new wxMetaFile;
 178     wx_mf->SetHMETAFILE((WXHANDLE) mf);
 179     wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 180     return wx_mf;
 181   }
 182   return NULL;
 183 }
 184
 185 void wxMetaFileDC::SetMapMode(int mode)
 186 {
 187   m_mappingMode = mode;
 188
 189 //  int pixel_width = 0;
 190 //  int pixel_height = 0;
 191 //  int mm_width = 0;
 192 //  int mm_height = 0;
 193
 194   float mm2pixelsX = 10.0;
 195   float mm2pixelsY = 10.0;
 196
 197   switch (mode)
 198   {
 199     case MM_TWIPS:
 200     {
 201       m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 202       m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 203       break;
 204     }
 205     case MM_POINTS:
 206     {
 207       m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 208       m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 209       break;
 210     }
 211     case MM_METRIC:
 212     {
 213       m_logicalScaleX = mm2pixelsX;
 214       m_logicalScaleY = mm2pixelsY;
 215       break;
 216     }
 217     case MM_LOMETRIC:
 218     {
 219       m_logicalScaleX = (float)(mm2pixelsX/10.0);
 220       m_logicalScaleY = (float)(mm2pixelsY/10.0);
 221       break;
 222     }
 223     default:
 224     case MM_TEXT:
 225     {
 226       m_logicalScaleX = 1.0;
 227       m_logicalScaleY = 1.0;
 228       break;
 229     }
 230   }
 231   m_windowExtX = 100;
 232   m_windowExtY = 100;
 233 }
 234
 235 #ifdef __WIN32__
 236 struct RECT32
 237 {
 238   short left;
 239   short top;
 240   short right;
 241   short bottom;
 242 };
 243
 244 struct mfPLACEABLEHEADER {
 245         DWORD   key;
 246         short   hmf;
 247         RECT32  bbox;
 248         WORD    inch;
 249         DWORD   reserved;
 250         WORD    checksum;
 251 };
 252 #else
 253 struct mfPLACEABLEHEADER {
 254         DWORD   key;
 255         HANDLE  hmf;
 256         RECT    bbox;
 257         WORD    inch;
 258         DWORD   reserved;
 259         WORD    checksum;
 260 };
 261 #endif
 262
 263 /*
 264  * Pass filename of existing non-placeable metafile, and bounding box.
 265  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 266  * and sets the window origin and extent to mimic the MM_TEXT mapping mode.
 267  *
 268  */
 269
 270 bool wxMakeMetaFilePlaceable(const wxString& filename, float scale)
 271 {
 272   return wxMakeMetaFilePlaceable(filename, 0, 0, 0, 0, scale, FALSE);
 273 }
 274
 275 bool wxMakeMetaFilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 276 {
 277   // I'm not sure if this is the correct way of suggesting a scale
 278   // to the client application, but it's the only way I can find.
 279   int unitsPerInch = (int)(576/scale);
 280
 281   mfPLACEABLEHEADER header;
 282   header.key = 0x9AC6CDD7L;
 283   header.hmf = 0;
 284   header.bbox.left = (int)(x1);
 285   header.bbox.top = (int)(y1);
 286   header.bbox.right = (int)(x2);
 287   header.bbox.bottom = (int)(y2);
 288   header.inch = unitsPerInch;
 289   header.reserved = 0;
 290
 291   // Calculate checksum
 292   WORD *p;
 293   mfPLACEABLEHEADER *pMFHead = &header;
 294   for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 295         p < (WORD *)&pMFHead ->checksum; ++p)
 296        pMFHead ->checksum ^= *p;
 297
 298   FILE *fd = fopen((char *)(const char *)filename, "rb");
 299   if (!fd) return FALSE;
 300
 301   char tempFileBuf[256];
 302   wxGetTempFileName("mf", tempFileBuf);
 303   FILE *fHandle = fopen(tempFileBuf, "wb");
 304   if (!fHandle)
 305     return FALSE;
 306   fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 307
 308   // Calculate origin and extent
 309   int originX = x1;
 310   int originY = y1;
 311   int extentX = x2 - x1;
 312   int extentY = (y2 - y1);
 313
 314   // Read metafile header and write
 315   METAHEADER metaHeader;
 316   fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 317
 318   if (useOriginAndExtent)
 319     metaHeader.mtSize += 15;
 320   else
 321     metaHeader.mtSize += 5;
 322
 323   fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 324
 325   // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 326   char modeBuffer[8];
 327   char originBuffer[10];
 328   char extentBuffer[10];
 329   METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 330
 331   METARECORD *originRecord = (METARECORD *)&originBuffer;
 332   METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 333
 334   modeRecord->rdSize = 4;
 335   modeRecord->rdFunction = META_SETMAPMODE;
 336   modeRecord->rdParm[0] = MM_ANISOTROPIC;
 337
 338   originRecord->rdSize = 5;
 339   originRecord->rdFunction = META_SETWINDOWORG;
 340   originRecord->rdParm[0] = originY;
 341   originRecord->rdParm[1] = originX;
 342
 343   extentRecord->rdSize = 5;
 344   extentRecord->rdFunction = META_SETWINDOWEXT;
 345   extentRecord->rdParm[0] = extentY;
 346   extentRecord->rdParm[1] = extentX;
 347
 348   fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 349
 350   if (useOriginAndExtent)
 351   {
 352     fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 353     fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 354   }
 355
 356   int ch = -2;
 357   while (ch != EOF)
 358   {
 359     ch = getc(fd);
 360     if (ch != EOF)
 361     {
 362       putc(ch, fHandle);
 363     }
 364   }
 365   fclose(fHandle);
 366   fclose(fd);
 367   wxRemoveFile(filename);
 368   wxCopyFile(tempFileBuf, filename);
 369   wxRemoveFile(tempFileBuf);
 370   return TRUE;
 371 }
 372
 373 #endif // USE_METAFILE