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 = wxMM_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 = wxMM_ANISOTROPIC;
  74     M_METAFILEDATA->m_metafile = 0;
  75     if (!file.IsNull() && (file.Cmp(T("")) == 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 != T("")))
 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 = wxMM_TEXT;
 158
 159   SetMapMode(wxMM_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 != T("") && 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 = wxMM_ANISOTROPIC;
 180
 181   SetMapMode(wxMM_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, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
 201   GetTextMetrics(dc, &tm);
 202
 203   ReleaseDC(NULL, dc);
 204
 205   if ( x )
 206       *x = sizeRect.cx;
 207   if ( y )
 208     *y = sizeRect.cy;
 209   if ( descent )
 210       *descent = tm.tmDescent;
 211   if ( externalLeading )
 212       *externalLeading = tm.tmExternalLeading;
 213 }
 214
 215 wxMetafile *wxMetafileDC::Close(void)
 216 {
 217   SelectOldObjects(m_hDC);
 218   HANDLE mf = CloseMetaFile((HDC) m_hDC);
 219   m_hDC = 0;
 220   if (mf)
 221   {
 222     wxMetafile *wx_mf = new wxMetafile;
 223     wx_mf->SetHMETAFILE((WXHANDLE) mf);
 224     wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
 225     return wx_mf;
 226   }
 227   return NULL;
 228 }
 229
 230 void wxMetafileDC::SetMapMode(int mode)
 231 {
 232   m_mappingMode = mode;
 233
 234 //  int pixel_width = 0;
 235 //  int pixel_height = 0;
 236 //  int mm_width = 0;
 237 //  int mm_height = 0;
 238
 239   float mm2pixelsX = 10.0;
 240   float mm2pixelsY = 10.0;
 241
 242   switch (mode)
 243   {
 244     case wxMM_TWIPS:
 245     {
 246       m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
 247       m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
 248       break;
 249     }
 250     case wxMM_POINTS:
 251     {
 252       m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
 253       m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
 254       break;
 255     }
 256     case wxMM_METRIC:
 257     {
 258       m_logicalScaleX = mm2pixelsX;
 259       m_logicalScaleY = mm2pixelsY;
 260       break;
 261     }
 262     case wxMM_LOMETRIC:
 263     {
 264       m_logicalScaleX = (float)(mm2pixelsX/10.0);
 265       m_logicalScaleY = (float)(mm2pixelsY/10.0);
 266       break;
 267     }
 268     default:
 269     case wxMM_TEXT:
 270     {
 271       m_logicalScaleX = 1.0;
 272       m_logicalScaleY = 1.0;
 273       break;
 274     }
 275   }
 276   m_windowExtX = 100;
 277   m_windowExtY = 100;
 278 }
 279
 280 #ifdef __WIN32__
 281 struct RECT32
 282 {
 283   short left;
 284   short top;
 285   short right;
 286   short bottom;
 287 };
 288
 289 struct mfPLACEABLEHEADER {
 290         DWORD   key;
 291         short   hmf;
 292         RECT32  bbox;
 293         WORD    inch;
 294         DWORD   reserved;
 295         WORD    checksum;
 296 };
 297 #else
 298 struct mfPLACEABLEHEADER {
 299         DWORD   key;
 300         HANDLE  hmf;
 301         RECT    bbox;
 302         WORD    inch;
 303         DWORD   reserved;
 304         WORD    checksum;
 305 };
 306 #endif
 307
 308 /*
 309  * Pass filename of existing non-placeable metafile, and bounding box.
 310  * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 311  * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 312  *
 313  */
 314
 315 bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
 316 {
 317   return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, FALSE);
 318 }
 319
 320 bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
 321 {
 322   // I'm not sure if this is the correct way of suggesting a scale
 323   // to the client application, but it's the only way I can find.
 324   int unitsPerInch = (int)(576/scale);
 325
 326   mfPLACEABLEHEADER header;
 327   header.key = 0x9AC6CDD7L;
 328   header.hmf = 0;
 329   header.bbox.left = (int)(x1);
 330   header.bbox.top = (int)(y1);
 331   header.bbox.right = (int)(x2);
 332   header.bbox.bottom = (int)(y2);
 333   header.inch = unitsPerInch;
 334   header.reserved = 0;
 335
 336   // Calculate checksum
 337   WORD *p;
 338   mfPLACEABLEHEADER *pMFHead = &header;
 339   for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
 340         p < (WORD *)&pMFHead ->checksum; ++p)
 341        pMFHead ->checksum ^= *p;
 342
 343   FILE *fd = fopen(filename.fn_str(), "rb");
 344   if (!fd) return FALSE;
 345
 346   wxChar tempFileBuf[256];
 347   wxGetTempFileName(T("mf"), tempFileBuf);
 348   FILE *fHandle = fopen(wxConvFile.cWX2MB(tempFileBuf), "wb");
 349   if (!fHandle)
 350     return FALSE;
 351   fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
 352
 353   // Calculate origin and extent
 354   int originX = x1;
 355   int originY = y1;
 356   int extentX = x2 - x1;
 357   int extentY = (y2 - y1);
 358
 359   // Read metafile header and write
 360   METAHEADER metaHeader;
 361   fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
 362
 363   if (useOriginAndExtent)
 364     metaHeader.mtSize += 15;
 365   else
 366     metaHeader.mtSize += 5;
 367
 368   fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
 369
 370   // Write SetMapMode, SetWindowOrigin and SetWindowExt records
 371   char modeBuffer[8];
 372   char originBuffer[10];
 373   char extentBuffer[10];
 374   METARECORD *modeRecord = (METARECORD *)&modeBuffer;
 375
 376   METARECORD *originRecord = (METARECORD *)&originBuffer;
 377   METARECORD *extentRecord = (METARECORD *)&extentBuffer;
 378
 379   modeRecord->rdSize = 4;
 380   modeRecord->rdFunction = META_SETMAPMODE;
 381   modeRecord->rdParm[0] = MM_ANISOTROPIC;
 382
 383   originRecord->rdSize = 5;
 384   originRecord->rdFunction = META_SETWINDOWORG;
 385   originRecord->rdParm[0] = originY;
 386   originRecord->rdParm[1] = originX;
 387
 388   extentRecord->rdSize = 5;
 389   extentRecord->rdFunction = META_SETWINDOWEXT;
 390   extentRecord->rdParm[0] = extentY;
 391   extentRecord->rdParm[1] = extentX;
 392
 393   fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
 394
 395   if (useOriginAndExtent)
 396   {
 397     fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
 398     fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
 399   }
 400
 401   int ch = -2;
 402   while (ch != EOF)
 403   {
 404     ch = getc(fd);
 405     if (ch != EOF)
 406     {
 407       putc(ch, fHandle);
 408     }
 409   }
 410   fclose(fHandle);
 411   fclose(fd);
 412   wxRemoveFile(filename);
 413   wxCopyFile(tempFileBuf, filename);
 414   wxRemoveFile(tempFileBuf);
 415   return TRUE;
 416 }
 417
 418 #endif // wxUSE_METAFILE
 419