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(0, 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(0, 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(0, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), 0, 0);
  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(0, 0, from->szFaceName, -1, t->szFaceName, sizeof(t->szFaceName), 0, 0);
 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   CHARFORMAT2W styledata;
 144   ME_Style *s = ALLOC_OBJ(ME_Style);
 145
 146   style = ME_ToCF2W(&styledata, style);
 147   memset(s, 0, sizeof(ME_Style));
 148   if (style->cbSize <= sizeof(CHARFORMAT2W))
 149     CopyMemory(&s->fmt, style, style->cbSize);
 150   else
 151     s->fmt = *style;
 152   s->fmt.cbSize = sizeof(CHARFORMAT2W);
 153
 154   s->nSequence = -2;
 155   s->nRefs = 1;
 156   s->hFont = NULL;
 157   s->tm.tmAscent = -1;
 158   all_refs++;
 159   return s;
 160 }
 161
 162 #define COPY_STYLE_ITEM(mask, member) \
 163   if (style->dwMask & mask) { \
 164     s->fmt.dwMask |= mask;\
 165     s->fmt.member = style->member;\
 166   }
 167
 168 #define COPY_STYLE_ITEM_MEMCPY(mask, member) \
 169   if (style->dwMask & mask) { \
 170     s->fmt.dwMask |= mask;\
 171     CopyMemory(s->fmt.member, style->member, sizeof(style->member));\
 172   }
 173
 174 void ME_InitCharFormat2W(CHARFORMAT2W *pFmt)
 175 {
 176   ZeroMemory(pFmt, sizeof(CHARFORMAT2W));
 177   pFmt->cbSize = sizeof(CHARFORMAT2W);
 178 }
 179
 180 ME_Style *ME_ApplyStyle(ME_Style *sSrc, CHARFORMAT2W *style)
 181 {
 182   CHARFORMAT2W styledata;
 183   ME_Style *s = ME_MakeStyle(&sSrc->fmt);
 184   style = ME_ToCF2W(&styledata, style);
 185   COPY_STYLE_ITEM(CFM_ANIMATION, bAnimation);
 186   COPY_STYLE_ITEM(CFM_BACKCOLOR, crBackColor);
 187   COPY_STYLE_ITEM(CFM_CHARSET, bCharSet);
 188   COPY_STYLE_ITEM(CFM_COLOR, crTextColor);
 189   COPY_STYLE_ITEM_MEMCPY(CFM_FACE, szFaceName);
 190   COPY_STYLE_ITEM(CFM_KERNING, wKerning);
 191   COPY_STYLE_ITEM(CFM_LCID, lcid);
 192   COPY_STYLE_ITEM(CFM_OFFSET, yOffset);
 193   COPY_STYLE_ITEM(CFM_REVAUTHOR, bRevAuthor);
 194   if (style->dwMask & CFM_SIZE) {
 195     s->fmt.dwMask |= CFM_SIZE;
 196     s->fmt.yHeight = min(style->yHeight, yHeightCharPtsMost * 20);
 197   }
 198   COPY_STYLE_ITEM(CFM_SPACING, sSpacing);
 199   COPY_STYLE_ITEM(CFM_STYLE, sStyle);
 200   COPY_STYLE_ITEM(CFM_UNDERLINETYPE, bUnderlineType);
 201   COPY_STYLE_ITEM(CFM_WEIGHT, wWeight);
 202   /* FIXME: this is not documented this way, but that's the more logical */
 203   COPY_STYLE_ITEM(CFM_FACE, bPitchAndFamily);
 204
 205   s->fmt.dwEffects &= ~(style->dwMask);
 206   s->fmt.dwEffects |= style->dwEffects & style->dwMask;
 207   s->fmt.dwMask |= style->dwMask;
 208   if (style->dwMask & CFM_COLOR)
 209   {
 210     if (style->dwEffects & CFE_AUTOCOLOR)
 211       s->fmt.dwEffects |= CFE_AUTOCOLOR;
 212     else
 213       s->fmt.dwEffects &= ~CFE_AUTOCOLOR;
 214   }
 215   if (style->dwMask & CFM_UNDERLINE)
 216   {
 217       s->fmt.dwMask |= CFM_UNDERLINETYPE;
 218       s->fmt.bUnderlineType = (style->dwEffects & CFM_UNDERLINE) ?
 219           CFU_CF1UNDERLINE : CFU_UNDERLINENONE;
 220   }
 221   if (style->dwMask & CFM_BOLD && !(style->dwMask & CFM_WEIGHT))
 222   {
 223       s->fmt.wWeight = (style->dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
 224   } else if (style->dwMask & CFM_WEIGHT && !(style->dwMask & CFM_BOLD)) {
 225       if (style->wWeight > FW_NORMAL)
 226           s->fmt.dwEffects |= CFE_BOLD;
 227       else
 228           s->fmt.dwEffects &= ~CFE_BOLD;
 229   }
 230   return s;
 231 }
 232
 233 void ME_CopyCharFormat(CHARFORMAT2W *pDest, const CHARFORMAT2W *pSrc)
 234 {
 235   /* using this with non-2W structs is forbidden */
 236   assert(pSrc->cbSize == sizeof(CHARFORMAT2W));
 237   assert(pDest->cbSize == sizeof(CHARFORMAT2W));
 238   *pDest = *pSrc;
 239 }
 240
 241 static void ME_DumpStyleEffect(char **p, const char *name, const CHARFORMAT2W *fmt, int mask)
 242 {
 243   *p += sprintf(*p, "%-22s%s\n", name, (fmt->dwMask & mask) ? ((fmt->dwEffects & mask) ? "YES" : "no") : "N/A");
 244 }
 245
 246 void ME_DumpStyle(ME_Style *s)
 247 {
 248   char buf[2048];
 249   ME_DumpStyleToBuf(&s->fmt, buf);
 250   TRACE_(richedit_style)("%s\n", buf);
 251 }
 252
 253 void ME_DumpStyleToBuf(CHARFORMAT2W *pFmt, char buf[2048])
 254 {
 255   /* FIXME only CHARFORMAT styles implemented */
 256   /* this function sucks, doesn't check for buffer overruns but it's "good enough" as for debug code */
 257   char *p;
 258   p = buf;
 259   p += sprintf(p, "Font face:            ");
 260   if (pFmt->dwMask & CFM_FACE) {
 261     WCHAR *q = pFmt->szFaceName;
 262     while(*q) {
 263       *p++ = (*q > 255) ? '?' : *q;
 264       q++;
 265     }
 266   } else
 267     p += sprintf(p, "N/A");
 268
 269   if (pFmt->dwMask & CFM_SIZE)
 270     p += sprintf(p, "\nFont size:            %d\n", pFmt->yHeight);
 271   else
 272     p += sprintf(p, "\nFont size:            N/A\n");
 273
 274   if (pFmt->dwMask & CFM_OFFSET)
 275     p += sprintf(p, "Char offset:          %d\n", pFmt->yOffset);
 276   else
 277     p += sprintf(p, "Char offset:          N/A\n");
 278
 279   if (pFmt->dwMask & CFM_CHARSET)
 280     p += sprintf(p, "Font charset:         %d\n", (int)pFmt->bCharSet);
 281   else
 282     p += sprintf(p, "Font charset:         N/A\n");
 283
 284   /* I'm assuming CFM_xxx and CFE_xxx are the same values, fortunately it IS true wrt used flags*/
 285   ME_DumpStyleEffect(&p, "Font bold:", pFmt, CFM_BOLD);
 286   ME_DumpStyleEffect(&p, "Font italic:", pFmt, CFM_ITALIC);
 287   ME_DumpStyleEffect(&p, "Font underline:", pFmt, CFM_UNDERLINE);
 288   ME_DumpStyleEffect(&p, "Font strikeout:", pFmt, CFM_STRIKEOUT);
 289   ME_DumpStyleEffect(&p, "Hidden text:", pFmt, CFM_HIDDEN);
 290   p += sprintf(p, "Text color:           ");
 291   if (pFmt->dwMask & CFM_COLOR)
 292   {
 293     if (pFmt->dwEffects & CFE_AUTOCOLOR)
 294       p += sprintf(p, "auto\n");
 295     else
 296       p += sprintf(p, "%06x\n", (int)pFmt->crTextColor);
 297   }
 298   else
 299     p += sprintf(p, "N/A\n");
 300   ME_DumpStyleEffect(&p, "Text protected:", pFmt, CFM_PROTECTED);
 301 }
 302
 303
 304 static void
 305 ME_LogFontFromStyle(ME_Context* c, LOGFONTW *lf, const ME_Style *s)
 306 {
 307   ZeroMemory(lf, sizeof(LOGFONTW));
 308   lstrcpyW(lf->lfFaceName, s->fmt.szFaceName);
 309
 310   lf->lfHeight = ME_twips2pointsY(c, -s->fmt.yHeight);
 311
 312   lf->lfWeight = FW_NORMAL;
 313   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_BOLD)
 314     lf->lfWeight = FW_BOLD;
 315   if (s->fmt.dwMask & CFM_WEIGHT)
 316     lf->lfWeight = s->fmt.wWeight;
 317   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_ITALIC)
 318     lf->lfItalic = 1;
 319   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_UNDERLINE | CFE_LINK))
 320     lf->lfUnderline = 1;
 321   if (s->fmt.dwMask & CFM_UNDERLINETYPE && s->fmt.bUnderlineType == CFU_CF1UNDERLINE)
 322     lf->lfUnderline = 1;
 323   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_STRIKEOUT)
 324     lf->lfStrikeOut = 1;
 325   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_SUBSCRIPT|CFM_SUPERSCRIPT))
 326     lf->lfHeight = (lf->lfHeight*2)/3;
 327 /*lf.lfQuality = PROOF_QUALITY; */
 328   if (s->fmt.dwMask & CFM_FACE)
 329     lf->lfPitchAndFamily = s->fmt.bPitchAndFamily;
 330   if (s->fmt.dwMask & CFM_CHARSET)
 331     lf->lfCharSet = s->fmt.bCharSet;
 332 }
 333
 334 void ME_CharFormatFromLogFont(HDC hDC, const LOGFONTW *lf, CHARFORMAT2W *fmt)
 335 {
 336   int ry;
 337
 338   ME_InitCharFormat2W(fmt);
 339   ry = GetDeviceCaps(hDC, LOGPIXELSY);
 340   lstrcpyW(fmt->szFaceName, lf->lfFaceName);
 341   fmt->dwEffects = 0;
 342   fmt->dwMask = CFM_WEIGHT|CFM_BOLD|CFM_ITALIC|CFM_UNDERLINE|CFM_STRIKEOUT|CFM_SIZE|CFM_FACE|CFM_CHARSET;
 343   fmt->wWeight = lf->lfWeight;
 344   fmt->yHeight = -lf->lfHeight*1440/ry;
 345   if (lf->lfWeight > FW_NORMAL) fmt->dwEffects |= CFM_BOLD;
 346   if (lf->lfItalic) fmt->dwEffects |= CFM_ITALIC;
 347   if (lf->lfUnderline) fmt->dwEffects |= CFM_UNDERLINE;
 348   /* notice that if a logfont was created with underline due to CFM_LINK, this
 349       would add an erroneous CFM_UNDERLINE. This isn't currently ever a problem. */
 350   if (lf->lfStrikeOut) fmt->dwEffects |= CFM_STRIKEOUT;
 351   fmt->bPitchAndFamily = lf->lfPitchAndFamily;
 352   fmt->bCharSet = lf->lfCharSet;
 353 }
 354
 355 static BOOL ME_IsFontEqual(const LOGFONTW *p1, const LOGFONTW *p2)
 356 {
 357   if (memcmp(p1, p2, sizeof(LOGFONTW)-sizeof(p1->lfFaceName)))
 358     return FALSE;
 359   if (lstrcmpW(p1->lfFaceName, p2->lfFaceName))
 360     return FALSE;
 361   return TRUE;
 362 }
 363
 364 HFONT ME_SelectStyleFont(ME_Context *c, ME_Style *s)
 365 {
 366   HFONT hOldFont;
 367   LOGFONTW lf;
 368   int i, nEmpty, nAge = 0x7FFFFFFF;
 369   ME_FontCacheItem *item;
 370   assert(s);
 371
 372   ME_LogFontFromStyle(c, &lf, s);
 373
 374   for (i=0; i<HFONT_CACHE_SIZE; i++)
 375     c->editor->pFontCache[i].nAge++;
 376   for (i=0, nEmpty=-1, nAge=0; i<HFONT_CACHE_SIZE; i++)
 377   {
 378     item = &c->editor->pFontCache[i];
 379     if (!item->nRefs)
 380     {
 381       if (item->nAge > nAge)
 382         nEmpty = i, nAge = item->nAge;
 383     }
 384     if (item->hFont && ME_IsFontEqual(&item->lfSpecs, &lf))
 385       break;
 386   }
 387   if (i < HFONT_CACHE_SIZE) /* found */
 388   {
 389     item = &c->editor->pFontCache[i];
 390     TRACE_(richedit_style)("font reused %d\n", i);
 391
 392     s->hFont = item->hFont;
 393     item->nRefs++;
 394   }
 395   else
 396   {
 397     item = &c->editor->pFontCache[nEmpty]; /* this legal even when nEmpty == -1, as we don't dereference it */
 398
 399     assert(nEmpty != -1); /* otherwise we leak cache entries or get too many fonts at once*/
 400     if (item->hFont) {
 401       TRACE_(richedit_style)("font deleted %d\n", nEmpty);
 402       DeleteObject(item->hFont);
 403       item->hFont = NULL;
 404     }
 405     s->hFont = CreateFontIndirectW(&lf);
 406     assert(s->hFont);
 407     TRACE_(richedit_style)("font created %d\n", nEmpty);
 408     item->hFont = s->hFont;
 409     item->nRefs = 1;
 410     item->lfSpecs = lf;
 411   }
 412   hOldFont = SelectObject(c->hDC, s->hFont);
 413   /* should be cached too, maybe ? */
 414   GetTextMetricsW(c->hDC, &s->tm);
 415   return hOldFont;
 416 }
 417
 418 void ME_UnselectStyleFont(ME_Context *c, ME_Style *s, HFONT hOldFont)
 419 {
 420   int i;
 421
 422   assert(s);
 423   SelectObject(c->hDC, hOldFont);
 424   for (i=0; i<HFONT_CACHE_SIZE; i++)
 425   {
 426     ME_FontCacheItem *pItem = &c->editor->pFontCache[i];
 427     if (pItem->hFont == s->hFont && pItem->nRefs > 0)
 428     {
 429       pItem->nRefs--;
 430       pItem->nAge = 0;
 431       s->hFont = NULL;
 432       return;
 433     }
 434   }
 435   assert(0 == "UnselectStyleFont without SelectStyleFont");
 436 }
 437
 438 static void ME_DestroyStyle(ME_Style *s) {
 439   if (s->hFont)
 440   {
 441     DeleteObject(s->hFont);
 442     s->hFont = NULL;
 443   }
 444   FREE_OBJ(s);
 445 }
 446
 447 void ME_AddRefStyle(ME_Style *s)
 448 {
 449   assert(s->nRefs>0); /* style with 0 references isn't supposed to exist */
 450   s->nRefs++;
 451   all_refs++;
 452 }
 453
 454 void ME_ReleaseStyle(ME_Style *s)
 455 {
 456   s->nRefs--;
 457   all_refs--;
 458   if (s->nRefs==0)
 459     TRACE_(richedit_style)("destroy style %p, total refs=%d\n", s, all_refs);
 460   else
 461     TRACE_(richedit_style)("release style %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 462   if (!all_refs) TRACE("all style references freed (good!)\n");
 463   assert(s->nRefs>=0);
 464   if (!s->nRefs)
 465     ME_DestroyStyle(s);
 466 }
 467
 468 ME_Style *ME_GetInsertStyle(ME_TextEditor *editor, int nCursor) {
 469   if (ME_IsSelection(editor))
 470   {
 471     ME_Cursor c;
 472     int from, to;
 473
 474     ME_GetSelection(editor, &from, &to);
 475     ME_CursorFromCharOfs(editor, from, &c);
 476     ME_AddRefStyle(c.pRun->member.run.style);
 477     return c.pRun->member.run.style;
 478   }
 479   if (editor->pBuffer->pCharStyle) {
 480     ME_AddRefStyle(editor->pBuffer->pCharStyle);
 481     return editor->pBuffer->pCharStyle;
 482   }
 483   else
 484   {
 485     ME_Cursor *pCursor = &editor->pCursors[nCursor];
 486     ME_DisplayItem *pRunItem = pCursor->pRun;
 487     ME_DisplayItem *pPrevItem = NULL;
 488     if (pCursor->nOffset) {
 489       ME_Run *pRun = &pRunItem->member.run;
 490       ME_AddRefStyle(pRun->style);
 491       return pRun->style;
 492     }
 493     pPrevItem = ME_FindItemBack(pRunItem, diRunOrParagraph);
 494     if (pPrevItem->type == diRun)
 495     {
 496       ME_AddRefStyle(pPrevItem->member.run.style);
 497       return pPrevItem->member.run.style;
 498     }
 499     else
 500     {
 501       ME_AddRefStyle(pRunItem->member.run.style);
 502       return pRunItem->member.run.style;
 503     }
 504   }
 505 }
 506
 507 void ME_SaveTempStyle(ME_TextEditor *editor)
 508 {
 509   ME_Style *old_style = editor->pBuffer->pCharStyle;
 510   editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 511   if (old_style)
 512     ME_ReleaseStyle(old_style);
 513 }
 514
 515 void ME_ClearTempStyle(ME_TextEditor *editor)
 516 {
 517   if (!editor->pBuffer->pCharStyle) return;
 518   ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 519   editor->pBuffer->pCharStyle = NULL;
 520 }