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   TRACE_(richedit_style)("ME_MakeStyle %p, total refs=%d\n", s, all_refs);
 160   return s;
 161 }
 162
 163 #define COPY_STYLE_ITEM(mask, member) \
 164   if (style->dwMask & mask) { \
 165     s->fmt.dwMask |= mask;\
 166     s->fmt.member = style->member;\
 167   }
 168
 169 #define COPY_STYLE_ITEM_MEMCPY(mask, member) \
 170   if (style->dwMask & mask) { \
 171     s->fmt.dwMask |= mask;\
 172     CopyMemory(s->fmt.member, style->member, sizeof(style->member));\
 173   }
 174
 175 void ME_InitCharFormat2W(CHARFORMAT2W *pFmt)
 176 {
 177   ZeroMemory(pFmt, sizeof(CHARFORMAT2W));
 178   pFmt->cbSize = sizeof(CHARFORMAT2W);
 179 }
 180
 181 ME_Style *ME_ApplyStyle(ME_Style *sSrc, CHARFORMAT2W *style)
 182 {
 183   CHARFORMAT2W styledata;
 184   ME_Style *s = ME_MakeStyle(&sSrc->fmt);
 185   style = ME_ToCF2W(&styledata, style);
 186   COPY_STYLE_ITEM(CFM_ANIMATION, bAnimation);
 187   COPY_STYLE_ITEM(CFM_BACKCOLOR, crBackColor);
 188   COPY_STYLE_ITEM(CFM_CHARSET, bCharSet);
 189   COPY_STYLE_ITEM(CFM_COLOR, crTextColor);
 190   COPY_STYLE_ITEM_MEMCPY(CFM_FACE, szFaceName);
 191   COPY_STYLE_ITEM(CFM_KERNING, wKerning);
 192   COPY_STYLE_ITEM(CFM_LCID, lcid);
 193   COPY_STYLE_ITEM(CFM_OFFSET, yOffset);
 194   COPY_STYLE_ITEM(CFM_REVAUTHOR, bRevAuthor);
 195   if (style->dwMask & CFM_SIZE) {
 196     s->fmt.dwMask |= CFM_SIZE;
 197     s->fmt.yHeight = min(style->yHeight, yHeightCharPtsMost * 20);
 198   }
 199   COPY_STYLE_ITEM(CFM_SPACING, sSpacing);
 200   COPY_STYLE_ITEM(CFM_STYLE, sStyle);
 201   COPY_STYLE_ITEM(CFM_UNDERLINETYPE, bUnderlineType);
 202   COPY_STYLE_ITEM(CFM_WEIGHT, wWeight);
 203   /* FIXME: this is not documented this way, but that's the more logical */
 204   COPY_STYLE_ITEM(CFM_FACE, bPitchAndFamily);
 205
 206   s->fmt.dwEffects &= ~(style->dwMask);
 207   s->fmt.dwEffects |= style->dwEffects & style->dwMask;
 208   s->fmt.dwMask |= style->dwMask;
 209   if (style->dwMask & CFM_COLOR)
 210   {
 211     if (style->dwEffects & CFE_AUTOCOLOR)
 212       s->fmt.dwEffects |= CFE_AUTOCOLOR;
 213     else
 214       s->fmt.dwEffects &= ~CFE_AUTOCOLOR;
 215   }
 216   if (style->dwMask & CFM_UNDERLINE)
 217   {
 218       s->fmt.dwMask |= CFM_UNDERLINETYPE;
 219       s->fmt.bUnderlineType = (style->dwEffects & CFM_UNDERLINE) ?
 220           CFU_CF1UNDERLINE : CFU_UNDERLINENONE;
 221   }
 222   if (style->dwMask & CFM_BOLD && !(style->dwMask & CFM_WEIGHT))
 223   {
 224       s->fmt.wWeight = (style->dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
 225   } else if (style->dwMask & CFM_WEIGHT && !(style->dwMask & CFM_BOLD)) {
 226       if (style->wWeight > FW_NORMAL)
 227           s->fmt.dwEffects |= CFE_BOLD;
 228       else
 229           s->fmt.dwEffects &= ~CFE_BOLD;
 230   }
 231   return s;
 232 }
 233
 234 void ME_CopyCharFormat(CHARFORMAT2W *pDest, const CHARFORMAT2W *pSrc)
 235 {
 236   /* using this with non-2W structs is forbidden */
 237   assert(pSrc->cbSize == sizeof(CHARFORMAT2W));
 238   assert(pDest->cbSize == sizeof(CHARFORMAT2W));
 239   *pDest = *pSrc;
 240 }
 241
 242 static void ME_DumpStyleEffect(char **p, const char *name, const CHARFORMAT2W *fmt, int mask)
 243 {
 244   *p += sprintf(*p, "%-22s%s\n", name, (fmt->dwMask & mask) ? ((fmt->dwEffects & mask) ? "YES" : "no") : "N/A");
 245 }
 246
 247 void ME_DumpStyle(ME_Style *s)
 248 {
 249   char buf[2048];
 250   ME_DumpStyleToBuf(&s->fmt, buf);
 251   TRACE_(richedit_style)("%s\n", buf);
 252 }
 253
 254 void ME_DumpStyleToBuf(CHARFORMAT2W *pFmt, char buf[2048])
 255 {
 256   /* FIXME only CHARFORMAT styles implemented */
 257   /* this function sucks, doesn't check for buffer overruns but it's "good enough" as for debug code */
 258   char *p;
 259   p = buf;
 260   p += sprintf(p, "Font face:            ");
 261   if (pFmt->dwMask & CFM_FACE) {
 262     WCHAR *q = pFmt->szFaceName;
 263     while(*q) {
 264       *p++ = (*q > 255) ? '?' : *q;
 265       q++;
 266     }
 267   } else
 268     p += sprintf(p, "N/A");
 269
 270   if (pFmt->dwMask & CFM_SIZE)
 271     p += sprintf(p, "\nFont size:            %d\n", pFmt->yHeight);
 272   else
 273     p += sprintf(p, "\nFont size:            N/A\n");
 274
 275   if (pFmt->dwMask & CFM_OFFSET)
 276     p += sprintf(p, "Char offset:          %d\n", pFmt->yOffset);
 277   else
 278     p += sprintf(p, "Char offset:          N/A\n");
 279
 280   if (pFmt->dwMask & CFM_CHARSET)
 281     p += sprintf(p, "Font charset:         %d\n", (int)pFmt->bCharSet);
 282   else
 283     p += sprintf(p, "Font charset:         N/A\n");
 284
 285   /* I'm assuming CFM_xxx and CFE_xxx are the same values, fortunately it IS true wrt used flags*/
 286   ME_DumpStyleEffect(&p, "Font bold:", pFmt, CFM_BOLD);
 287   ME_DumpStyleEffect(&p, "Font italic:", pFmt, CFM_ITALIC);
 288   ME_DumpStyleEffect(&p, "Font underline:", pFmt, CFM_UNDERLINE);
 289   ME_DumpStyleEffect(&p, "Font strikeout:", pFmt, CFM_STRIKEOUT);
 290   ME_DumpStyleEffect(&p, "Hidden text:", pFmt, CFM_HIDDEN);
 291   p += sprintf(p, "Text color:           ");
 292   if (pFmt->dwMask & CFM_COLOR)
 293   {
 294     if (pFmt->dwEffects & CFE_AUTOCOLOR)
 295       p += sprintf(p, "auto\n");
 296     else
 297       p += sprintf(p, "%06x\n", (int)pFmt->crTextColor);
 298   }
 299   else
 300     p += sprintf(p, "N/A\n");
 301   ME_DumpStyleEffect(&p, "Text protected:", pFmt, CFM_PROTECTED);
 302 }
 303
 304
 305 static void
 306 ME_LogFontFromStyle(ME_Context* c, LOGFONTW *lf, const ME_Style *s)
 307 {
 308   ZeroMemory(lf, sizeof(LOGFONTW));
 309   lstrcpyW(lf->lfFaceName, s->fmt.szFaceName);
 310
 311   lf->lfHeight = ME_twips2pointsY(c, -s->fmt.yHeight);
 312
 313   lf->lfWeight = FW_NORMAL;
 314   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_BOLD)
 315     lf->lfWeight = FW_BOLD;
 316   if (s->fmt.dwMask & CFM_WEIGHT)
 317     lf->lfWeight = s->fmt.wWeight;
 318   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_ITALIC)
 319     lf->lfItalic = 1;
 320   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_UNDERLINE | CFE_LINK))
 321     lf->lfUnderline = 1;
 322   if (s->fmt.dwMask & CFM_UNDERLINETYPE && s->fmt.bUnderlineType == CFU_CF1UNDERLINE)
 323     lf->lfUnderline = 1;
 324   if (s->fmt.dwEffects & s->fmt.dwMask & CFM_STRIKEOUT)
 325     lf->lfStrikeOut = 1;
 326   if (s->fmt.dwEffects & s->fmt.dwMask & (CFM_SUBSCRIPT|CFM_SUPERSCRIPT))
 327     lf->lfHeight = (lf->lfHeight*2)/3;
 328 /*lf.lfQuality = PROOF_QUALITY; */
 329   if (s->fmt.dwMask & CFM_FACE)
 330     lf->lfPitchAndFamily = s->fmt.bPitchAndFamily;
 331   if (s->fmt.dwMask & CFM_CHARSET)
 332     lf->lfCharSet = s->fmt.bCharSet;
 333 }
 334
 335 void ME_CharFormatFromLogFont(HDC hDC, const LOGFONTW *lf, CHARFORMAT2W *fmt)
 336 {
 337   int ry;
 338
 339   ME_InitCharFormat2W(fmt);
 340   ry = GetDeviceCaps(hDC, LOGPIXELSY);
 341   lstrcpyW(fmt->szFaceName, lf->lfFaceName);
 342   fmt->dwEffects = 0;
 343   fmt->dwMask = CFM_WEIGHT|CFM_BOLD|CFM_ITALIC|CFM_UNDERLINE|CFM_STRIKEOUT|CFM_SIZE|CFM_FACE|CFM_CHARSET;
 344   fmt->wWeight = lf->lfWeight;
 345   fmt->yHeight = -lf->lfHeight*1440/ry;
 346   if (lf->lfWeight > FW_NORMAL) fmt->dwEffects |= CFM_BOLD;
 347   if (lf->lfItalic) fmt->dwEffects |= CFM_ITALIC;
 348   if (lf->lfUnderline) fmt->dwEffects |= CFM_UNDERLINE;
 349   /* notice that if a logfont was created with underline due to CFM_LINK, this
 350       would add an erroneous CFM_UNDERLINE. This isn't currently ever a problem. */
 351   if (lf->lfStrikeOut) fmt->dwEffects |= CFM_STRIKEOUT;
 352   fmt->bPitchAndFamily = lf->lfPitchAndFamily;
 353   fmt->bCharSet = lf->lfCharSet;
 354 }
 355
 356 static BOOL ME_IsFontEqual(const LOGFONTW *p1, const LOGFONTW *p2)
 357 {
 358   if (memcmp(p1, p2, sizeof(LOGFONTW)-sizeof(p1->lfFaceName)))
 359     return FALSE;
 360   if (lstrcmpW(p1->lfFaceName, p2->lfFaceName))
 361     return FALSE;
 362   return TRUE;
 363 }
 364
 365 HFONT ME_SelectStyleFont(ME_Context *c, ME_Style *s)
 366 {
 367   HFONT hOldFont;
 368   LOGFONTW lf;
 369   int i, nEmpty, nAge = 0x7FFFFFFF;
 370   ME_FontCacheItem *item;
 371   assert(s);
 372
 373   ME_LogFontFromStyle(c, &lf, s);
 374
 375   for (i=0; i<HFONT_CACHE_SIZE; i++)
 376     c->editor->pFontCache[i].nAge++;
 377   for (i=0, nEmpty=-1, nAge=0; i<HFONT_CACHE_SIZE; i++)
 378   {
 379     item = &c->editor->pFontCache[i];
 380     if (!item->nRefs)
 381     {
 382       if (item->nAge > nAge)
 383         nEmpty = i, nAge = item->nAge;
 384     }
 385     if (item->hFont && ME_IsFontEqual(&item->lfSpecs, &lf))
 386       break;
 387   }
 388   if (i < HFONT_CACHE_SIZE) /* found */
 389   {
 390     item = &c->editor->pFontCache[i];
 391     TRACE_(richedit_style)("font reused %d\n", i);
 392
 393     s->hFont = item->hFont;
 394     item->nRefs++;
 395   }
 396   else
 397   {
 398     item = &c->editor->pFontCache[nEmpty]; /* this legal even when nEmpty == -1, as we don't dereference it */
 399
 400     assert(nEmpty != -1); /* otherwise we leak cache entries or get too many fonts at once*/
 401     if (item->hFont) {
 402       TRACE_(richedit_style)("font deleted %d\n", nEmpty);
 403       DeleteObject(item->hFont);
 404       item->hFont = NULL;
 405     }
 406     s->hFont = CreateFontIndirectW(&lf);
 407     assert(s->hFont);
 408     TRACE_(richedit_style)("font created %d\n", nEmpty);
 409     item->hFont = s->hFont;
 410     item->nRefs = 1;
 411     item->lfSpecs = lf;
 412   }
 413   hOldFont = SelectObject(c->hDC, s->hFont);
 414   /* should be cached too, maybe ? */
 415   GetTextMetricsW(c->hDC, &s->tm);
 416   return hOldFont;
 417 }
 418
 419 void ME_UnselectStyleFont(ME_Context *c, ME_Style *s, HFONT hOldFont)
 420 {
 421   int i;
 422
 423   assert(s);
 424   SelectObject(c->hDC, hOldFont);
 425   for (i=0; i<HFONT_CACHE_SIZE; i++)
 426   {
 427     ME_FontCacheItem *pItem = &c->editor->pFontCache[i];
 428     if (pItem->hFont == s->hFont && pItem->nRefs > 0)
 429     {
 430       pItem->nRefs--;
 431       pItem->nAge = 0;
 432       s->hFont = NULL;
 433       return;
 434     }
 435   }
 436   assert(0 == "UnselectStyleFont without SelectStyleFont");
 437 }
 438
 439 static void ME_DestroyStyle(ME_Style *s) {
 440   if (s->hFont)
 441   {
 442     DeleteObject(s->hFont);
 443     s->hFont = NULL;
 444   }
 445   FREE_OBJ(s);
 446 }
 447
 448 void ME_AddRefStyle(ME_Style *s)
 449 {
 450   assert(s->nRefs>0); /* style with 0 references isn't supposed to exist */
 451   s->nRefs++;
 452   all_refs++;
 453   TRACE_(richedit_style)("ME_AddRefStyle %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 454 }
 455
 456 void ME_ReleaseStyle(ME_Style *s)
 457 {
 458   s->nRefs--;
 459   all_refs--;
 460   if (s->nRefs==0)
 461     TRACE_(richedit_style)("destroy style %p, total refs=%d\n", s, all_refs);
 462   else
 463     TRACE_(richedit_style)("release style %p, new refs=%d, total refs=%d\n", s, s->nRefs, all_refs);
 464   if (!all_refs) TRACE("all style references freed (good!)\n");
 465   assert(s->nRefs>=0);
 466   if (!s->nRefs)
 467     ME_DestroyStyle(s);
 468 }
 469
 470 ME_Style *ME_GetInsertStyle(ME_TextEditor *editor, int nCursor)
 471 {
 472   if (ME_IsSelection(editor))
 473   {
 474     ME_Cursor *from, *to;
 475
 476     ME_GetSelection(editor, &from, &to);
 477     ME_AddRefStyle(from->pRun->member.run.style);
 478     return from->pRun->member.run.style;
 479   }
 480   if (editor->pBuffer->pCharStyle) {
 481     ME_AddRefStyle(editor->pBuffer->pCharStyle);
 482     return editor->pBuffer->pCharStyle;
 483   }
 484   else
 485   {
 486     ME_Cursor *pCursor = &editor->pCursors[nCursor];
 487     ME_DisplayItem *pRunItem = pCursor->pRun;
 488     ME_DisplayItem *pPrevItem = NULL;
 489     if (pCursor->nOffset) {
 490       ME_Run *pRun = &pRunItem->member.run;
 491       ME_AddRefStyle(pRun->style);
 492       return pRun->style;
 493     }
 494     pPrevItem = ME_FindItemBack(pRunItem, diRunOrParagraph);
 495     if (pPrevItem->type == diRun)
 496     {
 497       ME_AddRefStyle(pPrevItem->member.run.style);
 498       return pPrevItem->member.run.style;
 499     }
 500     else
 501     {
 502       ME_AddRefStyle(pRunItem->member.run.style);
 503       return pRunItem->member.run.style;
 504     }
 505   }
 506 }
 507
 508 void ME_SaveTempStyle(ME_TextEditor *editor)
 509 {
 510   ME_Style *old_style = editor->pBuffer->pCharStyle;
 511   editor->pBuffer->pCharStyle = ME_GetInsertStyle(editor, 0);
 512   if (old_style)
 513     ME_ReleaseStyle(old_style);
 514 }
 515
 516 void ME_ClearTempStyle(ME_TextEditor *editor)
 517 {
 518   if (!editor->pBuffer->pCharStyle) return;
 519   ME_ReleaseStyle(editor->pBuffer->pCharStyle);
 520   editor->pBuffer->pCharStyle = NULL;
 521 }