dlls/riched20/style.c

   1 /*
   2  * RichEdit style management functions
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "editor.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  24 WINE_DECLARE_DEBUG_CHANNEL(richedit_style);
  25
  26 static int all_refs = 0;
  27
  28 /* the following routines assume that:
  29  * - char2[AW] extends char[AW] by adding fields at the end of the charA form)
  30  * - szFaceName is the last field of char[AW] form, and wWeight the first of 2[AW]
  31  * - the difference between A and W form is the szFaceName as Ansi vs Unicode string
  32  * - because of alignment, offset of wWeight field in 2[AW] structure *IS NOT*
  33  *   sizeof(char[AW])
  34  */
  35
  36 CHARFORMAT2W *ME_ToCF2W(CHARFORMAT2W *to, CHARFORMAT2W *from)
  37 {
  38   if (from->cbSize == sizeof(CHARFORMATA))
  39   {
  40     CHARFORMATA *f = (CHARFORMATA *)from;
  41     CopyMemory(to, f, FIELD_OFFSET(CHARFORMATA, szFaceName));
  42     to->cbSize = sizeof(CHARFORMAT2W);
  43     if (f->dwMask & CFM_FACE) {
  44       MultiByteToWideChar(CP_ACP, 0, f->szFaceName, -1, to->szFaceName, sizeof(to->szFaceName)/sizeof(WCHAR));
  45     }
  46     return to;
  47   }
  48   if (from->cbSize == sizeof(CHARFORMATW))
  49   {
  50     CHARFORMATW *f = (CHARFORMATW *)from;
  51     CopyMemory(to, f, sizeof(*f));
  52     /* theoretically, we don't need to zero the remaining memory */
  53     ZeroMemory(&to->wWeight, sizeof(CHARFORMAT2W)-FIELD_OFFSET(CHARFORMAT2W, wWeight));
  54     to->cbSize = sizeof(CHARFORMAT2W);
  55     return to;
  56   }
  57   if (from->cbSize == sizeof(CHARFORMAT2A))
  58   {
  59     CHARFORMAT2A *f = (CHARFORMAT2A *)from;
  60     /* copy the A structure without face name */
  61     CopyMemory(to, f, FIELD_OFFSET(CHARFORMATA, szFaceName));
  62     /* convert face name */
  63     if (f->dwMask & CFM_FACE)
  64       MultiByteToWideChar(CP_ACP, 0, f->szFaceName, -1, to->szFaceName, sizeof(to->szFaceName)/sizeof(WCHAR));
  65     /* copy the rest of the 2A structure to 2W */
  66     CopyMemory(&to->wWeight, &f->wWeight, sizeof(CHARFORMAT2A)-FIELD_OFFSET(CHARFORMAT2A, wWeight));
  67     to->cbSize = sizeof(CHARFORMAT2W);
  68     return to;
  69   }
  70
  71   return (from->cbSize >= sizeof(CHARFORMAT2W)) ? from : NULL;
  72 }
  73
  74 static CHARFORMAT2W *ME_ToCFAny(CHARFORMAT2W *to, CHARFORMAT2W *from)
  75 {
  76   assert(from->cbSize == sizeof(CHARFORMAT2W));
  77   if (to->cbSize == sizeof(CHARFORMATA))
  78   {
  79     CHARFORMATA *t = (CHARFORMATA *)to;
  80     CopyMemory(t, from, FIELD_OFFSET(CHARFORMATA, szFaceName));
  81     WideCharToMultiByte(CP_ACP, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), NULL, NULL);
  82     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
  83     return to;
  84   }
  85   if (to->cbSize == sizeof(CHARFORMATW))
  86   {
  87     CHARFORMATW *t = (CHARFORMATW *)to;
  88     CopyMemory(t, from, sizeof(*t));
  89     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
  90     return to;
  91   }
  92   if (to->cbSize == sizeof(CHARFORMAT2A))
  93   {
  94     CHARFORMAT2A *t = (CHARFORMAT2A *)to;
  95     /* copy the A structure without face name */
  96     CopyMemory(t, from, FIELD_OFFSET(CHARFORMATA, szFaceName));
  97     /* convert face name */
  98     WideCharToMultiByte(CP_ACP, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), NULL, NULL);
  99     /* copy the rest of the 2A structure to 2W */
 100     CopyMemory(&t->wWeight, &from->wWeight, sizeof(CHARFORMAT2W)-FIELD_OFFSET(CHARFORMAT2W,wWeight));
 101     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 102     return to;
 103   }
 104   assert(to->cbSize >= sizeof(CHARFORMAT2W));
 105   return from;
 106 }
 107
 108 void ME_CopyToCFAny(CHARFORMAT2W *to, CHARFORMAT2W *from)
 109 {
 110   if (ME_ToCFAny(to, from) == from)
 111     CopyMemory(to, from, to->cbSize);
 112 }
 113
 114 ME_Style *ME_MakeStyle(CHARFORMAT2W *style)
 115 {
 116   ME_Style *s = heap_alloc(sizeof(*s));
 117
 118   assert(style->cbSize == sizeof(CHARFORMAT2W));
 119   s->fmt = *style;
 120   s->nRefs = 1;
 121   s->font_cache = NULL;
 122   memset(&s->tm, 0, sizeof(s->tm));
 123   s->tm.tmAscent = -1;
 124   s->script_cache = NULL;
 125   list_init(&s->entry);
 126   all_refs++;
 127   TRACE_(richedit_style)("ME_MakeStyle %p, total refs=%d\n", s, all_refs);
 128   return s;
 129 }
 130
 131 #define COPY_STYLE_ITEM(mask, member) \
 132   if (mod->dwMask & mask) { \
 133     fmt.dwMask |= mask;\
 134     fmt.member = mod->member;\
 135   }
 136
 137 #define COPY_STYLE_ITEM_MEMCPY(mask, member) \
 138   if (mod->dwMask & mask) { \
 139     fmt.dwMask |= mask;\
 140     CopyMemory(fmt.member, mod->member, sizeof(mod->member));\
 141   }
 142
 143 void ME_InitCharFormat2W(CHARFORMAT2W *pFmt)
 144 {
 145   ZeroMemory(pFmt, sizeof(CHARFORMAT2W));
 146   pFmt->cbSize = sizeof(CHARFORMAT2W);
 147 }
 148
 149 ME_Style *ME_ApplyStyle(ME_TextEditor *editor, ME_Style *sSrc, CHARFORMAT2W *mod)
 150 {
 151   CHARFORMAT2W fmt = sSrc->fmt;
 152   ME_Style *s;
 153
 154   assert(mod->cbSize == sizeof(CHARFORMAT2W));
 155   COPY_STYLE_ITEM(CFM_ANIMATION, bAnimation);
 156   COPY_STYLE_ITEM(CFM_BACKCOLOR, crBackColor);
 157   COPY_STYLE_ITEM(CFM_CHARSET, bCharSet);
 158   COPY_STYLE_ITEM(CFM_COLOR, crTextColor);
 159   COPY_STYLE_ITEM_MEMCPY(CFM_FACE, szFaceName);
 160   COPY_STYLE_ITEM(CFM_KERNING, wKerning);
 161   COPY_STYLE_ITEM(CFM_LCID, lcid);
 162   COPY_STYLE_ITEM(CFM_OFFSET, yOffset);
 163   COPY_STYLE_ITEM(CFM_REVAUTHOR, bRevAuthor);
 164   if (mod->dwMask & CFM_SIZE) {
 165     fmt.dwMask |= CFM_SIZE;
 166     fmt.yHeight = min(mod->yHeight, yHeightCharPtsMost * 20);
 167   }
 168   COPY_STYLE_ITEM(CFM_SPACING, sSpacing);
 169   COPY_STYLE_ITEM(CFM_STYLE, sStyle);
 170   COPY_STYLE_ITEM(CFM_WEIGHT, wWeight);
 171   /* FIXME: this is not documented this way, but that's the more logical */
 172   COPY_STYLE_ITEM(CFM_FACE, bPitchAndFamily);
 173
 174   fmt.dwEffects &= ~(mod->dwMask);
 175   fmt.dwEffects |= mod->dwEffects & mod->dwMask;
 176   fmt.dwMask |= mod->dwMask;
 177   if (mod->dwMask & CFM_COLOR)
 178   {
 179     if (mod->dwEffects & CFE_AUTOCOLOR)
 180       fmt.dwEffects |= CFE_AUTOCOLOR;
 181     else
 182       fmt.dwEffects &= ~CFE_AUTOCOLOR;
 183   }
 184
 185   COPY_STYLE_ITEM(CFM_UNDERLINETYPE, bUnderlineType);
 186   /* If the CFM_UNDERLINE effect is not specified, set it appropriately */
 187   if ((mod->dwMask & CFM_UNDERLINETYPE) && !(mod->dwMask & CFM_UNDERLINE))
 188   {
 189       fmt.dwMask |= CFM_UNDERLINE;
 190       if (mod->bUnderlineType == CFU_UNDERLINENONE)
 191           fmt.dwEffects &= ~CFE_UNDERLINE;
 192       else
 193           fmt.dwEffects |= CFE_UNDERLINE;
 194   }
 195
 196   if (mod->dwMask & CFM_BOLD && !(mod->dwMask & CFM_WEIGHT))
 197   {
 198       fmt.wWeight = (mod->dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
 199   } else if (mod->dwMask & CFM_WEIGHT && !(mod->dwMask & CFM_BOLD)) {
 200       if (mod->wWeight > FW_NORMAL)
 201           fmt.dwEffects |= CFE_BOLD;
 202       else
 203           fmt.dwEffects &= ~CFE_BOLD;
 204   }
 205
 206   LIST_FOR_EACH_ENTRY(s, &editor->style_list, ME_Style, entry)
 207   {
 208       if (!memcmp( &s->fmt, &fmt, sizeof(fmt) ))
 209       {
 210           TRACE_(richedit_style)("found existing style %p\n", s);
 211           ME_AddRefStyle( s );
 212           return s;
 213       }
 214   }
 215
 216   s = ME_MakeStyle( &fmt );
 217   if (s)
 218       list_add_head( &editor->style_list, &s->entry );
 219   TRACE_(richedit_style)("created new style %p\n", s);
 220   return s;
 221 }
 222
 223 void ME_CopyCharFormat(CHARFORMAT2W *pDest, const CHARFORMAT2W *pSrc)
 224 {
 225   /* using this with non-2W structs is forbidden */
 226   assert(pSrc->cbSize == sizeof(CHARFORMAT2W));
 227   assert(pDest->cbSize == sizeof(CHARFORMAT2W));
 228   *pDest = *pSrc;
 229 }
 230
 231 static void ME_DumpStyleEffect(char **p, const char *name, const CHARFORMAT2W *fmt, int mask)
 232 {
 233   *p += sprintf(*p, "%-22s%s\n", name, (fmt->dwMask & mask) ? ((fmt->dwEffects & mask) ? "YES" : "no") : "N/A");
 234 }
 235
 236 void ME_DumpStyle(ME_Style *s)
 237 {
 238   char buf[2048];
 239   ME_DumpStyleToBuf(&s->fmt, buf);
 240   TRACE_(richedit_style)("%s\n", buf);
 241 }
 242
 243 void ME_DumpStyleToBuf(CHARFORMAT2W *pFmt, char buf[2048])
 244 {
 245   /* FIXME only CHARFORMAT styles implemented */
 246   /* this function sucks, doesn't check for buffer overruns but it's "good enough" as for debug code */
 247   char *p;
 248   p = buf;
 249   p += sprintf(p, "Font face:            ");
 250   if (pFmt->dwMask & CFM_FACE) {
 251     WCHAR *q = pFmt->szFaceName;
 252     while(*q) {
 253       *p++ = (*q > 255) ? '?' : *q;
 254       q++;
 255     }
 256   } else
 257     p += sprintf(p, "N/A");
 258
 259   if (pFmt->dwMask & CFM_SIZE)
 260     p += sprintf(p, "\nFont size:            %d\n", pFmt->yHeight);
 261   else
 262     p += sprintf(p, "\nFont size:            N/A\n");
 263
 264   if (pFmt->dwMask & CFM_OFFSET)
 265     p += sprintf(p, "Char offset:          %d\n", pFmt->yOffset);
 266   else
 267     p += sprintf(p, "Char offset:          N/A\n");
 268
 269   if (pFmt->dwMask & CFM_CHARSET)
 270     p += sprintf(p, "Font charset:         %d\n", (int)pFmt->bCharSet);
 271   else
 272     p += sprintf(p, "Font charset:         N/A\n");
 273
 274   /* I'm assuming CFM_xxx and CFE_xxx are the same values, fortunately it IS true wrt used flags*/
 275   ME_DumpStyleEffect(&p, "Font bold:", pFmt, CFM_BOLD);
 276   ME_DumpStyleEffect(&p, "Font italic:", pFmt, CFM_ITALIC);
 277   ME_DumpStyleEffect(&p, "Font underline:", pFmt, CFM_UNDERLINE);
 278   ME_DumpStyleEffect(&p, "Font strikeout:", pFmt, CFM_STRIKEOUT);
 279   ME_DumpStyleEffect(&p, "Hidden text:", pFmt, CFM_HIDDEN);
 280   p += sprintf(p, "Text color:           ");
 281   if (pFmt->dwMask & CFM_COLOR)
 282   {
 283     if (pFmt->dwEffects & CFE_AUTOCOLOR)
 284       p += sprintf(p, "auto\n");
 285     else
 286       p += sprintf(p, "%06x\n", (int)pFmt->crTextColor);
 287   }
 288   else
 289     p += sprintf(p, "N/A\n");
 290   ME_DumpStyleEffect(&p, "Text protected:", pFmt, CFM_PROTECTED);
 291 }
 292
 293
 294 static void
 295 ME_LogFontFromStyle(ME_Context* c, LOGFONTW *lf, const ME_Style *s)
 296 {
 297   ZeroMemory(lf, sizeof(LOGFONTW));
 298   lstrcpyW(lf->lfFaceName, s->fmt.szFaceName);
 299
 300   lf->lfHeight = ME_twips2pointsY(c, -s->fmt.yHeight);
 301
 302   lf->lfWeight = FW_NORMAL;
 303   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_BOLD)
 304     lf->lfWeight = FW_BOLD;
 305   if (s->fmt.dwMask & CFM_WEIGHT)
 306     lf->lfWeight = s->fmt.wWeight;
 307   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_ITALIC)
 308     lf->lfItalic = 1;
 309   if ((s->fmt.dwEffects & s->fmt.dwMask & CFM_UNDERLINE) &&
 310       !(s->fmt.dwEffects & CFE_LINK) &&
 311       s->fmt.bUnderlineType == CFU_CF1UNDERLINE)
 312     lf->lfUnderline = 1;
 313   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_STRIKEOUT)
 314     lf->lfStrikeOut = 1;
 315   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_SUBSCRIPT|CFM_SUPERSCRIPT))
 316     lf->lfHeight = (lf->lfHeight*2)/3;
 317 /*lf.lfQuality = PROOF_QUALITY; */
 318   if (s->fmt.dwMask & CFM_FACE)
 319     lf->lfPitchAndFamily = s->fmt.bPitchAndFamily;
 320   if (s->fmt.dwMask & CFM_CHARSET)
 321     lf->lfCharSet = s->fmt.bCharSet;
 322 }
 323
 324 void ME_CharFormatFromLogFont(HDC hDC, const LOGFONTW *lf, CHARFORMAT2W *fmt)
 325 {
 326   int ry;
 327
 328   ME_InitCharFormat2W(fmt);
 329   ry = GetDeviceCaps(hDC, LOGPIXELSY);
 330   lstrcpyW(fmt->szFaceName, lf->lfFaceName);
 331   fmt->dwEffects = 0;
 332   fmt->dwMask = CFM_WEIGHT|CFM_BOLD|CFM_ITALIC|CFM_UNDERLINE|CFM_UNDERLINETYPE|CFM_STRIKEOUT|CFM_SIZE|CFM_FACE|CFM_CHARSET;
 333   fmt->wWeight = lf->lfWeight;
 334   fmt->yHeight = -lf->lfHeight*1440/ry;
 335   if (lf->lfWeight > FW_NORMAL) fmt->dwEffects |= CFM_BOLD;
 336   if (lf->lfItalic) fmt->dwEffects |= CFM_ITALIC;
 337   if (lf->lfUnderline) fmt->dwEffects |= CFM_UNDERLINE;
 338   fmt->bUnderlineType = CFU_UNDERLINE;
 339   if (lf->lfStrikeOut) fmt->dwEffects |= CFM_STRIKEOUT;
 340   fmt->bPitchAndFamily = lf->lfPitchAndFamily;
 341   fmt->bCharSet = lf->lfCharSet;
 342 }
 343
 344 static BOOL ME_IsFontEqual(const LOGFONTW *p1, const LOGFONTW *p2)
 345 {
 346   if (memcmp(p1, p2, sizeof(LOGFONTW)-sizeof(p1->lfFaceName)))
 347     return FALSE;
 348   if (lstrcmpW(p1->lfFaceName, p2->lfFaceName))
 349     return FALSE;
 350   return TRUE;
 351 }
 352
 353 HFONT ME_SelectStyleFont(ME_Context *c, ME_Style *s)
 354 {
 355   HFONT hOldFont;
 356   LOGFONTW lf;
 357   int i, nEmpty, nAge = 0x7FFFFFFF;
 358   ME_FontCacheItem *item;
 359   assert(s);
 360
 361   ME_LogFontFromStyle(c, &lf, s);
 362
 363   for (i=0; i<HFONT_CACHE_SIZE; i++)
 364     c->editor->pFontCache[i].nAge++;
 365   for (i=0, nEmpty=-1, nAge=0; i<HFONT_CACHE_SIZE; i++)
 366   {
 367     item = &c->editor->pFontCache[i];
 368     if (!item->nRefs)
 369     {
 370       if (item->nAge > nAge)
 371         nEmpty = i, nAge = item->nAge;
 372     }
 373     if (item->hFont && ME_IsFontEqual(&item->lfSpecs, &lf))
 374       break;
 375   }
 376   if (i < HFONT_CACHE_SIZE) /* found */
 377   {
 378     item = &c->editor->pFontCache[i];
 379     TRACE_(richedit_style)("font reused %d\n", i);
 380     item->nRefs++;
 381   }
 382   else
 383   {
 384     item = &c->editor->pFontCache[nEmpty]; /* this legal even when nEmpty == -1, as we don't dereference it */
 385
 386     assert(nEmpty != -1); /* otherwise we leak cache entries or get too many fonts at once*/
 387     if (item->hFont) {
 388       TRACE_(richedit_style)("font deleted %d\n", nEmpty);
 389       DeleteObject(item->hFont);
 390       item->hFont = NULL;
 391     }
 392     item->hFont = CreateFontIndirectW(&lf);
 393     TRACE_(richedit_style)("font created %d\n", nEmpty);
 394     item->nRefs = 1;
 395     item->lfSpecs = lf;
 396   }
 397   s->font_cache = item;
 398   hOldFont = SelectObject(c->hDC, item->hFont);
 399   /* should be cached too, maybe ? */
 400   GetTextMetricsW(c->hDC, &s->tm);
 401   return hOldFont;
 402 }
 403
 404 static void release_font_cache(ME_FontCacheItem *item)
 405 {
 406     if (item->nRefs > 0)
 407     {
 408         item->nRefs--;
 409         item->nAge = 0;
 410     }
 411 }
 412
 413 void ME_UnselectStyleFont(ME_Context *c, ME_Style *s, HFONT hOldFont)
 414 {
 415   SelectObject(c->hDC, hOldFont);
 416   release_font_cache(s->font_cache);
 417   s->font_cache = NULL;
 418 }
 419
 420 void ME_DestroyStyle(ME_Style *s)
 421 {
 422   list_remove( &s->entry );
 423   if (s->font_cache)
 424   {
 425     release_font_cache( s->font_cache );
 426     s->font_cache = NULL;
 427   }
 428   ScriptFreeCache( &s->script_cache );
 429   heap_free(s);
 430 }
 431
 432 void ME_AddRefStyle(ME_Style *s)
 433 {
 434   assert(s->nRefs>0); /* style with 0 references isn't supposed to exist */
 435   s->nRefs++;
 436   all_refs++;
 437   TRACE_(richedit_style)("ME_AddRefStyle %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 438 }
 439
 440 void ME_ReleaseStyle(ME_Style *s)
 441 {
 442   s->nRefs--;
 443   all_refs--;
 444   if (s->nRefs==0)
 445     TRACE_(richedit_style)("destroy style %p, total refs=%d\n", s, all_refs);
 446   else
 447     TRACE_(richedit_style)("release style %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 448   if (!all_refs) TRACE("all style references freed (good!)\n");
 449   assert(s->nRefs>=0);
 450   if (!s->nRefs)
 451     ME_DestroyStyle(s);
 452 }
 453
 454 ME_Style *ME_GetInsertStyle(ME_TextEditor *editor, int nCursor)
 455 {
 456   if (ME_IsSelection(editor))
 457   {
 458     ME_Cursor *from, *to;
 459
 460     ME_GetSelection(editor, &from, &to);
 461     ME_AddRefStyle(from->pRun->member.run.style);
 462     return from->pRun->member.run.style;
 463   }
 464   if (editor->pBuffer->pCharStyle) {
 465     ME_AddRefStyle(editor->pBuffer->pCharStyle);
 466     return editor->pBuffer->pCharStyle;
 467   }
 468   else
 469   {
 470     ME_Cursor *pCursor = &editor->pCursors[nCursor];
 471     ME_DisplayItem *pRunItem = pCursor->pRun;
 472     ME_DisplayItem *pPrevItem = NULL;
 473     if (pCursor->nOffset) {
 474       ME_Run *pRun = &pRunItem->member.run;
 475       ME_AddRefStyle(pRun->style);
 476       return pRun->style;
 477     }
 478     pPrevItem = ME_FindItemBack(pRunItem, diRunOrParagraph);
 479     if (pPrevItem->type == diRun)
 480     {
 481       ME_AddRefStyle(pPrevItem->member.run.style);
 482       return pPrevItem->member.run.style;
 483     }
 484     else
 485     {
 486       ME_AddRefStyle(pRunItem->member.run.style);
 487       return pRunItem->member.run.style;
 488     }
 489   }
 490 }
 491
 492 void ME_SaveTempStyle(ME_TextEditor *editor, ME_Style *style)
 493 {
 494   ME_Style *old_style = editor->pBuffer->pCharStyle;
 495
 496   if (style) ME_AddRefStyle( style );
 497   editor->pBuffer->pCharStyle = style;
 498   if (old_style) ME_ReleaseStyle( old_style );
 499 }
 500
 501 void ME_ClearTempStyle(ME_TextEditor *editor)
 502 {
 503   if (!editor->pBuffer->pCharStyle) return;
 504   ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 505   editor->pBuffer->pCharStyle = NULL;
 506 }
 507
 508 /******************************************************************************
 509  * ME_SetDefaultCharFormat
 510  *
 511  * Applies a style change to the default character style.
 512  *
 513  * The default style is special in that it is mutable - runs
 514  * in the document that have this style should change if the
 515  * default style changes.  That means we need to fix up this
 516  * style manually.
 517  */
 518 void ME_SetDefaultCharFormat(ME_TextEditor *editor, CHARFORMAT2W *mod)
 519 {
 520     ME_Style *style, *def = editor->pBuffer->pDefaultStyle;
 521
 522     assert(mod->cbSize == sizeof(CHARFORMAT2W));
 523     style = ME_ApplyStyle(editor, def, mod);
 524     def->fmt = style->fmt;
 525     def->tm = style->tm;
 526     if (def->font_cache)
 527     {
 528         release_font_cache( def->font_cache );
 529         def->font_cache = NULL;
 530     }
 531     ScriptFreeCache( &def->script_cache );
 532     ME_ReleaseStyle( style );
 533     ME_MarkAllForWrapping( editor );
 534 }