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* font.c (copy_font_spec): Redesign to avoid Fcopy_alist

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and unnecessary initialization.  Adjust comments.
This commit is contained in:
Dmitry Antipov 2014-10-31 14:09:00 +03:00
parent b77b925455
commit b645a03e5c
2 changed files with 31 additions and 18 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2014-10-31 Dmitry Antipov <dmantipov@yandex.ru>
* font.c (copy_font_spec): Redesign to avoid Fcopy_alist
and unnecessary initialization. Adjust comments.
2014-10-30 Eli Zaretskii <eliz@gnu.org>
* bidi.c (bidi_cache_reset_to): Invalidate bidi_cache_last_idx by

44
src/font.c
View file

@ -3944,29 +3944,37 @@ usage: (font-spec ARGS...) */)
return spec;
}
/* Return a copy of FONT as a font-spec. */
/* Return a copy of FONT as a font-spec. For the sake of speed, this code
relies on an internal stuff exposed from alloc.c and should be handled
with care. */
Lisp_Object
copy_font_spec (Lisp_Object font)
{
Lisp_Object new_spec, tail, prev, extra;
int i;
enum { font_spec_size = VECSIZE (struct font_spec) };
Lisp_Object new_spec, tail, *pcdr;
struct font_spec *spec;
CHECK_FONT (font);
new_spec = font_make_spec ();
for (i = 1; i < FONT_EXTRA_INDEX; i++)
ASET (new_spec, i, AREF (font, i));
extra = Fcopy_alist (AREF (font, FONT_EXTRA_INDEX));
/* We must remove :font-entity property. */
for (prev = Qnil, tail = extra; CONSP (tail); prev = tail, tail = XCDR (tail))
if (EQ (XCAR (XCAR (tail)), QCfont_entity))
{
if (NILP (prev))
extra = XCDR (extra);
else
XSETCDR (prev, XCDR (tail));
break;
}
ASET (new_spec, FONT_EXTRA_INDEX, extra);
/* Make an uninitialized font-spec object. */
spec = (struct font_spec *) allocate_vector (font_spec_size);
XSETPVECTYPESIZE (spec, PVEC_FONT, FONT_SPEC_MAX,
font_spec_size - FONT_SPEC_MAX);
spec->props[FONT_TYPE_INDEX] = spec->props[FONT_EXTRA_INDEX] = Qnil;
/* Copy basic properties FONT_FOUNDRY_INDEX..FONT_AVGWIDTH_INDEX. */
memcpy (spec->props + 1, XVECTOR (font)->contents + 1,
(FONT_EXTRA_INDEX - 1) * word_size);
/* Copy an alist of extra information but discard :font-entity property. */
pcdr = spec->props + FONT_EXTRA_INDEX;
for (tail = AREF (font, FONT_EXTRA_INDEX); CONSP (tail); tail = XCDR (tail))
if (!EQ (XCAR (XCAR (tail)), QCfont_entity))
*pcdr = Fcons (XCAR (tail), Qnil), pcdr = xcdr_addr (*pcdr);
XSETFONT (new_spec, spec);
return new_spec;
}