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     if (from->dwMask & CFM_UNDERLINETYPE)
  83     {
  84         switch (from->bUnderlineType)
  85         {
  86         case CFU_CF1UNDERLINE:
  87             to->dwMask |= CFM_UNDERLINE;
  88             to->dwEffects |= CFE_UNDERLINE;
  89             break;
  90         case CFU_UNDERLINENONE:
  91             to->dwMask |= CFM_UNDERLINE;
  92             to->dwEffects &= ~CFE_UNDERLINE;
  93             break;
  94         }
  95     }
  96     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
  97     return to;
  98   }
  99   if (to->cbSize == sizeof(CHARFORMATW))
 100   {
 101     CHARFORMATW *t = (CHARFORMATW *)to;
 102     CopyMemory(t, from, sizeof(*t));
 103     if (from->dwMask & CFM_UNDERLINETYPE)
 104     {
 105         switch (from->bUnderlineType)
 106         {
 107         case CFU_CF1UNDERLINE:
 108             to->dwMask |= CFM_UNDERLINE;
 109             to->dwEffects |= CFE_UNDERLINE;
 110             break;
 111         case CFU_UNDERLINENONE:
 112             to->dwMask |= CFM_UNDERLINE;
 113             to->dwEffects &= ~CFE_UNDERLINE;
 114             break;
 115         }
 116     }
 117     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 118     return to;
 119   }
 120   if (to->cbSize == sizeof(CHARFORMAT2A))
 121   {
 122     CHARFORMAT2A *t = (CHARFORMAT2A *)to;
 123     /* copy the A structure without face name */
 124     CopyMemory(t, from, FIELD_OFFSET(CHARFORMATA, szFaceName));
 125     /* convert face name */
 126     WideCharToMultiByte(CP_ACP, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), NULL, NULL);
 127     /* copy the rest of the 2A structure to 2W */
 128     CopyMemory(&t->wWeight, &from->wWeight, sizeof(CHARFORMAT2W)-FIELD_OFFSET(CHARFORMAT2W,wWeight));
 129     t->cbSize = sizeof(*t); /* it was overwritten by CopyMemory */
 130     return to;
 131   }
 132   assert(to->cbSize >= sizeof(CHARFORMAT2W));
 133   return from;
 134 }
 135
 136 void ME_CopyToCFAny(CHARFORMAT2W *to, CHARFORMAT2W *from)
 137 {
 138   if (ME_ToCFAny(to, from) == from)
 139     CopyMemory(to, from, to->cbSize);
 140 }
 141
 142 ME_Style *ME_MakeStyle(CHARFORMAT2W *style)
 143 {
 144   ME_Style *s = ALLOC_OBJ(ME_Style);
 145
 146   assert(style->cbSize == sizeof(CHARFORMAT2W));
 147   s->fmt = *style;
 148   s->nRefs = 1;
 149   s->hFont = NULL;
 150   memset(&s->tm, 0, sizeof(s->tm));
 151   s->tm.tmAscent = -1;
 152   s->script_cache = NULL;
 153   all_refs++;
 154   TRACE_(richedit_style)("ME_MakeStyle %p, total refs=%d\n", s, all_refs);
 155   return s;
 156 }
 157
 158 #define COPY_STYLE_ITEM(mask, member) \
 159   if (style->dwMask & mask) { \
 160     s->fmt.dwMask |= mask;\
 161     s->fmt.member = style->member;\
 162   }
 163
 164 #define COPY_STYLE_ITEM_MEMCPY(mask, member) \
 165   if (style->dwMask & mask) { \
 166     s->fmt.dwMask |= mask;\
 167     CopyMemory(s->fmt.member, style->member, sizeof(style->member));\
 168   }
 169
 170 void ME_InitCharFormat2W(CHARFORMAT2W *pFmt)
 171 {
 172   ZeroMemory(pFmt, sizeof(CHARFORMAT2W));
 173   pFmt->cbSize = sizeof(CHARFORMAT2W);
 174 }
 175
 176 ME_Style *ME_ApplyStyle(ME_Style *sSrc, CHARFORMAT2W *style)
 177 {
 178   ME_Style *s = ME_MakeStyle(&sSrc->fmt);
 179   assert(style->cbSize == sizeof(CHARFORMAT2W));
 180   COPY_STYLE_ITEM(CFM_ANIMATION, bAnimation);
 181   COPY_STYLE_ITEM(CFM_BACKCOLOR, crBackColor);
 182   COPY_STYLE_ITEM(CFM_CHARSET, bCharSet);
 183   COPY_STYLE_ITEM(CFM_COLOR, crTextColor);
 184   COPY_STYLE_ITEM_MEMCPY(CFM_FACE, szFaceName);
 185   COPY_STYLE_ITEM(CFM_KERNING, wKerning);
 186   COPY_STYLE_ITEM(CFM_LCID, lcid);
 187   COPY_STYLE_ITEM(CFM_OFFSET, yOffset);
 188   COPY_STYLE_ITEM(CFM_REVAUTHOR, bRevAuthor);
 189   if (style->dwMask & CFM_SIZE) {
 190     s->fmt.dwMask |= CFM_SIZE;
 191     s->fmt.yHeight = min(style->yHeight, yHeightCharPtsMost * 20);
 192   }
 193   COPY_STYLE_ITEM(CFM_SPACING, sSpacing);
 194   COPY_STYLE_ITEM(CFM_STYLE, sStyle);
 195   COPY_STYLE_ITEM(CFM_UNDERLINETYPE, bUnderlineType);
 196   COPY_STYLE_ITEM(CFM_WEIGHT, wWeight);
 197   /* FIXME: this is not documented this way, but that's the more logical */
 198   COPY_STYLE_ITEM(CFM_FACE, bPitchAndFamily);
 199
 200   s->fmt.dwEffects &= ~(style->dwMask);
 201   s->fmt.dwEffects |= style->dwEffects & style->dwMask;
 202   s->fmt.dwMask |= style->dwMask;
 203   if (style->dwMask & CFM_COLOR)
 204   {
 205     if (style->dwEffects & CFE_AUTOCOLOR)
 206       s->fmt.dwEffects |= CFE_AUTOCOLOR;
 207     else
 208       s->fmt.dwEffects &= ~CFE_AUTOCOLOR;
 209   }
 210   if (style->dwMask & CFM_UNDERLINE)
 211   {
 212       s->fmt.dwMask |= CFM_UNDERLINETYPE;
 213       s->fmt.bUnderlineType = (style->dwEffects & CFM_UNDERLINE) ?
 214           CFU_CF1UNDERLINE : CFU_UNDERLINENONE;
 215   }
 216   if (style->dwMask & CFM_BOLD && !(style->dwMask & CFM_WEIGHT))
 217   {
 218       s->fmt.wWeight = (style->dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
 219   } else if (style->dwMask & CFM_WEIGHT && !(style->dwMask & CFM_BOLD)) {
 220       if (style->wWeight > FW_NORMAL)
 221           s->fmt.dwEffects |= CFE_BOLD;
 222       else
 223           s->fmt.dwEffects &= ~CFE_BOLD;
 224   }
 225   return s;
 226 }
 227
 228 void ME_CopyCharFormat(CHARFORMAT2W *pDest, const CHARFORMAT2W *pSrc)
 229 {
 230   /* using this with non-2W structs is forbidden */
 231   assert(pSrc->cbSize == sizeof(CHARFORMAT2W));
 232   assert(pDest->cbSize == sizeof(CHARFORMAT2W));
 233   *pDest = *pSrc;
 234 }
 235
 236 static void ME_DumpStyleEffect(char **p, const char *name, const CHARFORMAT2W *fmt, int mask)
 237 {
 238   *p += sprintf(*p, "%-22s%s\n", name, (fmt->dwMask & mask) ? ((fmt->dwEffects & mask) ? "YES" : "no") : "N/A");
 239 }
 240
 241 void ME_DumpStyle(ME_Style *s)
 242 {
 243   char buf[2048];
 244   ME_DumpStyleToBuf(&s->fmt, buf);
 245   TRACE_(richedit_style)("%s\n", buf);
 246 }
 247
 248 void ME_DumpStyleToBuf(CHARFORMAT2W *pFmt, char buf[2048])
 249 {
 250   /* FIXME only CHARFORMAT styles implemented */
 251   /* this function sucks, doesn't check for buffer overruns but it's "good enough" as for debug code */
 252   char *p;
 253   p = buf;
 254   p += sprintf(p, "Font face:            ");
 255   if (pFmt->dwMask & CFM_FACE) {
 256     WCHAR *q = pFmt->szFaceName;
 257     while(*q) {
 258       *p++ = (*q > 255) ? '?' : *q;
 259       q++;
 260     }
 261   } else
 262     p += sprintf(p, "N/A");
 263
 264   if (pFmt->dwMask & CFM_SIZE)
 265     p += sprintf(p, "\nFont size:            %d\n", pFmt->yHeight);
 266   else
 267     p += sprintf(p, "\nFont size:            N/A\n");
 268
 269   if (pFmt->dwMask & CFM_OFFSET)
 270     p += sprintf(p, "Char offset:          %d\n", pFmt->yOffset);
 271   else
 272     p += sprintf(p, "Char offset:          N/A\n");
 273
 274   if (pFmt->dwMask & CFM_CHARSET)
 275     p += sprintf(p, "Font charset:         %d\n", (int)pFmt->bCharSet);
 276   else
 277     p += sprintf(p, "Font charset:         N/A\n");
 278
 279   /* I'm assuming CFM_xxx and CFE_xxx are the same values, fortunately it IS true wrt used flags*/
 280   ME_DumpStyleEffect(&p, "Font bold:", pFmt, CFM_BOLD);
 281   ME_DumpStyleEffect(&p, "Font italic:", pFmt, CFM_ITALIC);
 282   ME_DumpStyleEffect(&p, "Font underline:", pFmt, CFM_UNDERLINE);
 283   ME_DumpStyleEffect(&p, "Font strikeout:", pFmt, CFM_STRIKEOUT);
 284   ME_DumpStyleEffect(&p, "Hidden text:", pFmt, CFM_HIDDEN);
 285   p += sprintf(p, "Text color:           ");
 286   if (pFmt->dwMask & CFM_COLOR)
 287   {
 288     if (pFmt->dwEffects & CFE_AUTOCOLOR)
 289       p += sprintf(p, "auto\n");
 290     else
 291       p += sprintf(p, "%06x\n", (int)pFmt->crTextColor);
 292   }
 293   else
 294     p += sprintf(p, "N/A\n");
 295   ME_DumpStyleEffect(&p, "Text protected:", pFmt, CFM_PROTECTED);
 296 }
 297
 298
 299 static void
 300 ME_LogFontFromStyle(ME_Context* c, LOGFONTW *lf, const ME_Style *s)
 301 {
 302   ZeroMemory(lf, sizeof(LOGFONTW));
 303   lstrcpyW(lf->lfFaceName, s->fmt.szFaceName);
 304
 305   lf->lfHeight = ME_twips2pointsY(c, -s->fmt.yHeight);
 306
 307   lf->lfWeight = FW_NORMAL;
 308   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_BOLD)
 309     lf->lfWeight = FW_BOLD;
 310   if (s->fmt.dwMask & CFM_WEIGHT)
 311     lf->lfWeight = s->fmt.wWeight;
 312   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_ITALIC)
 313     lf->lfItalic = 1;
 314   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_UNDERLINE | CFE_LINK))
 315     lf->lfUnderline = 1;
 316   if (s->fmt.dwMask & CFM_UNDERLINETYPE && s->fmt.bUnderlineType == CFU_CF1UNDERLINE)
 317     lf->lfUnderline = 1;
 318   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_STRIKEOUT)
 319     lf->lfStrikeOut = 1;
 320   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_SUBSCRIPT|CFM_SUPERSCRIPT))
 321     lf->lfHeight = (lf->lfHeight*2)/3;
 322 /*lf.lfQuality = PROOF_QUALITY; */
 323   if (s->fmt.dwMask & CFM_FACE)
 324     lf->lfPitchAndFamily = s->fmt.bPitchAndFamily;
 325   if (s->fmt.dwMask & CFM_CHARSET)
 326     lf->lfCharSet = s->fmt.bCharSet;
 327 }
 328
 329 void ME_CharFormatFromLogFont(HDC hDC, const LOGFONTW *lf, CHARFORMAT2W *fmt)
 330 {
 331   int ry;
 332
 333   ME_InitCharFormat2W(fmt);
 334   ry = GetDeviceCaps(hDC, LOGPIXELSY);
 335   lstrcpyW(fmt->szFaceName, lf->lfFaceName);
 336   fmt->dwEffects = 0;
 337   fmt->dwMask = CFM_WEIGHT|CFM_BOLD|CFM_ITALIC|CFM_UNDERLINE|CFM_STRIKEOUT|CFM_SIZE|CFM_FACE|CFM_CHARSET;
 338   fmt->wWeight = lf->lfWeight;
 339   fmt->yHeight = -lf->lfHeight*1440/ry;
 340   if (lf->lfWeight > FW_NORMAL) fmt->dwEffects |= CFM_BOLD;
 341   if (lf->lfItalic) fmt->dwEffects |= CFM_ITALIC;
 342   if (lf->lfUnderline) fmt->dwEffects |= CFM_UNDERLINE;
 343   /* notice that if a logfont was created with underline due to CFM_LINK, this
 344       would add an erroneous CFM_UNDERLINE. This isn't currently ever a problem. */
 345   if (lf->lfStrikeOut) fmt->dwEffects |= CFM_STRIKEOUT;
 346   fmt->bPitchAndFamily = lf->lfPitchAndFamily;
 347   fmt->bCharSet = lf->lfCharSet;
 348 }
 349
 350 static BOOL ME_IsFontEqual(const LOGFONTW *p1, const LOGFONTW *p2)
 351 {
 352   if (memcmp(p1, p2, sizeof(LOGFONTW)-sizeof(p1->lfFaceName)))
 353     return FALSE;
 354   if (lstrcmpW(p1->lfFaceName, p2->lfFaceName))
 355     return FALSE;
 356   return TRUE;
 357 }
 358
 359 HFONT ME_SelectStyleFont(ME_Context *c, ME_Style *s)
 360 {
 361   HFONT hOldFont;
 362   LOGFONTW lf;
 363   int i, nEmpty, nAge = 0x7FFFFFFF;
 364   ME_FontCacheItem *item;
 365   assert(s);
 366
 367   ME_LogFontFromStyle(c, &lf, s);
 368
 369   for (i=0; i<HFONT_CACHE_SIZE; i++)
 370     c->editor->pFontCache[i].nAge++;
 371   for (i=0, nEmpty=-1, nAge=0; i<HFONT_CACHE_SIZE; i++)
 372   {
 373     item = &c->editor->pFontCache[i];
 374     if (!item->nRefs)
 375     {
 376       if (item->nAge > nAge)
 377         nEmpty = i, nAge = item->nAge;
 378     }
 379     if (item->hFont && ME_IsFontEqual(&item->lfSpecs, &lf))
 380       break;
 381   }
 382   if (i < HFONT_CACHE_SIZE) /* found */
 383   {
 384     item = &c->editor->pFontCache[i];
 385     TRACE_(richedit_style)("font reused %d\n", i);
 386
 387     s->hFont = item->hFont;
 388     item->nRefs++;
 389   }
 390   else
 391   {
 392     item = &c->editor->pFontCache[nEmpty]; /* this legal even when nEmpty == -1, as we don't dereference it */
 393
 394     assert(nEmpty != -1); /* otherwise we leak cache entries or get too many fonts at once*/
 395     if (item->hFont) {
 396       TRACE_(richedit_style)("font deleted %d\n", nEmpty);
 397       DeleteObject(item->hFont);
 398       item->hFont = NULL;
 399     }
 400     s->hFont = CreateFontIndirectW(&lf);
 401     assert(s->hFont);
 402     TRACE_(richedit_style)("font created %d\n", nEmpty);
 403     item->hFont = s->hFont;
 404     item->nRefs = 1;
 405     item->lfSpecs = lf;
 406   }
 407   hOldFont = SelectObject(c->hDC, s->hFont);
 408   /* should be cached too, maybe ? */
 409   GetTextMetricsW(c->hDC, &s->tm);
 410   return hOldFont;
 411 }
 412
 413 void ME_UnselectStyleFont(ME_Context *c, ME_Style *s, HFONT hOldFont)
 414 {
 415   int i;
 416
 417   assert(s);
 418   SelectObject(c->hDC, hOldFont);
 419   for (i=0; i<HFONT_CACHE_SIZE; i++)
 420   {
 421     ME_FontCacheItem *pItem = &c->editor->pFontCache[i];
 422     if (pItem->hFont == s->hFont && pItem->nRefs > 0)
 423     {
 424       pItem->nRefs--;
 425       pItem->nAge = 0;
 426       s->hFont = NULL;
 427       return;
 428     }
 429   }
 430   assert(0 == "UnselectStyleFont without SelectStyleFont");
 431 }
 432
 433 static void ME_DestroyStyle(ME_Style *s) {
 434   if (s->hFont)
 435   {
 436     DeleteObject(s->hFont);
 437     s->hFont = NULL;
 438   }
 439   ScriptFreeCache( &s->script_cache );
 440   FREE_OBJ(s);
 441 }
 442
 443 void ME_AddRefStyle(ME_Style *s)
 444 {
 445   assert(s->nRefs>0); /* style with 0 references isn't supposed to exist */
 446   s->nRefs++;
 447   all_refs++;
 448   TRACE_(richedit_style)("ME_AddRefStyle %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 449 }
 450
 451 void ME_ReleaseStyle(ME_Style *s)
 452 {
 453   s->nRefs--;
 454   all_refs--;
 455   if (s->nRefs==0)
 456     TRACE_(richedit_style)("destroy style %p, total refs=%d\n", s, all_refs);
 457   else
 458     TRACE_(richedit_style)("release style %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 459   if (!all_refs) TRACE("all style references freed (good!)\n");
 460   assert(s->nRefs>=0);
 461   if (!s->nRefs)
 462     ME_DestroyStyle(s);
 463 }
 464
 465 ME_Style *ME_GetInsertStyle(ME_TextEditor *editor, int nCursor)
 466 {
 467   if (ME_IsSelection(editor))
 468   {
 469     ME_Cursor *from, *to;
 470
 471     ME_GetSelection(editor, &from, &to);
 472     ME_AddRefStyle(from->pRun->member.run.style);
 473     return from->pRun->member.run.style;
 474   }
 475   if (editor->pBuffer->pCharStyle) {
 476     ME_AddRefStyle(editor->pBuffer->pCharStyle);
 477     return editor->pBuffer->pCharStyle;
 478   }
 479   else
 480   {
 481     ME_Cursor *pCursor = &editor->pCursors[nCursor];
 482     ME_DisplayItem *pRunItem = pCursor->pRun;
 483     ME_DisplayItem *pPrevItem = NULL;
 484     if (pCursor->nOffset) {
 485       ME_Run *pRun = &pRunItem->member.run;
 486       ME_AddRefStyle(pRun->style);
 487       return pRun->style;
 488     }
 489     pPrevItem = ME_FindItemBack(pRunItem, diRunOrParagraph);
 490     if (pPrevItem->type == diRun)
 491     {
 492       ME_AddRefStyle(pPrevItem->member.run.style);
 493       return pPrevItem->member.run.style;
 494     }
 495     else
 496     {
 497       ME_AddRefStyle(pRunItem->member.run.style);
 498       return pRunItem->member.run.style;
 499     }
 500   }
 501 }
 502
 503 void ME_SaveTempStyle(ME_TextEditor *editor)
 504 {
 505   ME_Style *old_style = editor->pBuffer->pCharStyle;
 506   editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 507   if (old_style)
 508     ME_ReleaseStyle(old_style);
 509 }
 510
 511 void ME_ClearTempStyle(ME_TextEditor *editor)
 512 {
 513   if (!editor->pBuffer->pCharStyle) return;
 514   ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 515   editor->pBuffer->pCharStyle = NULL;
 516 }