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Improve font selection for punctuation and other symbols

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* src/fontset.c (face_for_char): If the character's script is
'symbol', and the font used for ASCII face has a glyph for it, use
the font for the ASCII face instead of searching the fontsets.
This comes instead of NS-specific code that used the current
face's font instead, which is now disabled due to undesirable
consequences.  (Bug#20727)
This commit is contained in:
Eli Zaretskii 2015-06-09 17:56:39 +03:00
parent 68273707ec
commit e0707282d2
1 changed files with 37 additions and 9 deletions
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46
src/fontset.c
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@ -892,18 +892,46 @@ face_for_char (struct frame *f, struct face *face, int c,
if (ASCII_CHAR_P (c) || CHAR_BYTE8_P (c))
return face->ascii_face->id;
#ifdef HAVE_NS
if (face->font)
if (c > 0 && EQ (CHAR_TABLE_REF (Vchar_script_table, c), Qsymbol))
{
/* Fonts often have characters in other scripts, like symbol, even if they
don't match script: symbol. So check if the character is present
in the current face first. Only enable for NS for now, but should
perhaps be general? */
/* Fonts often have characters for punctuation and other
symbols, even if they don't match the 'symbol' script. So
check if the character is present in the current ASCII face
first, and if so, use the same font as used by that face.
This avoids unnecessarily switching to another font when the
frame's default font will do. We only do this for symbols so
that users could still setup fontsets to force Emacs to use
specific fonts for characters from other scripts, because
choice of fonts is frequently affected by cultural
preferences and font features, not by font coverage.
However, these considerations are unlikely to be relevant to
punctuation and other symbols, since the latter generally
aren't specific to any culture, and don't require
sophisticated OTF features. */
Lisp_Object font_object;
XSETFONT (font_object, face->font);
if (font_has_char (f, font_object, c)) return face->id;
}
if (face->ascii_face->font)
{
XSETFONT (font_object, face->ascii_face->font);
if (font_has_char (f, font_object, c))
return face->ascii_face->id;
}
#if 0
/* Try the current face. Disabled because it can cause
counter-intuitive results, whereby the font used for some
character depends on the characters that precede it on
display. See the discussion of bug #15138. Note that the
original bug reported in #15138 was in a situation where face
== face->ascii_face, so the above code solves that situation
without risking the undesirable consequences. */
if (face->font)
{
XSETFONT (font_object, face->font);
if (font_has_char (f, font_object, c)) return face->id;
}
#endif
}
fontset = FONTSET_FROM_ID (face->fontset);
eassert (!BASE_FONTSET_P (fontset));