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Code Issues Releases Activity

Don't attempt to cache glyph metrics for FONT_INVALID_CODE

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This was causing massive slowdown in redisplay when eg #xfe0f
(VARIATION SELECTOR-16) was present, as the cache ended up very large,
unused, and being recreated on every call to font_fill_lglyph_metrics
(Bug#39133).

* src/composite.c (fill_gstring_body): Hoist FONT_OBJECT_P check out
of loop.  Calculate glyph code and check for FONT_INVALID_CODE before
calling font_fill_lglyph_metrics.  Pass glyph code to it.

* src/font.c (font_fill_lglyph_metrics): Add code parameter, move
glyph code calculation up the call stack into fill_gstring_body.

* src/font.h: Adjust font_fill_lglyph_metrics prototype.
This commit is contained in:
Robert Pluim 2020-01-24 14:11:44 +01:00
parent b42b894d1d
commit fe1a447d52
3 changed files with 16 additions and 8 deletions
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18
src/composite.c
View File

@ -818,6 +818,11 @@ fill_gstring_body (Lisp_Object gstring)
Lisp_Object header = AREF (gstring, 0);
ptrdiff_t len = LGSTRING_CHAR_LEN (gstring);
ptrdiff_t i;
struct font *font = NULL;
unsigned int code;
if (FONT_OBJECT_P (font_object))
font = XFONT_OBJECT (font_object);
for (i = 0; i < len; i++)
{
@ -832,10 +837,15 @@ fill_gstring_body (Lisp_Object gstring)
LGLYPH_SET_FROM (g, i);
LGLYPH_SET_TO (g, i);
LGLYPH_SET_CHAR (g, c);
if (FONT_OBJECT_P (font_object))
{
font_fill_lglyph_metrics (g, font_object);
}
if (font != NULL)
code = font->driver->encode_char (font, LGLYPH_CHAR (g));
else
code = FONT_INVALID_CODE;
if (code != FONT_INVALID_CODE)
{
font_fill_lglyph_metrics (g, font, code);
}
else
{
int width = XFIXNAT (CHAR_TABLE_REF (Vchar_width_table, c));

4
src/font.c
View File

@ -4416,10 +4416,8 @@ DEFUN ("clear-font-cache", Fclear_font_cache, Sclear_font_cache, 0, 0, 0,
void
font_fill_lglyph_metrics (Lisp_Object glyph, Lisp_Object font_object)
font_fill_lglyph_metrics (Lisp_Object glyph, struct font *font, unsigned int code)
{
struct font *font = XFONT_OBJECT (font_object);
unsigned code = font->driver->encode_char (font, LGLYPH_CHAR (glyph));
struct font_metrics metrics;
LGLYPH_SET_CODE (glyph, code);

2
src/font.h
View File

@ -886,7 +886,7 @@ extern Lisp_Object font_update_drivers (struct frame *f, Lisp_Object list);
extern Lisp_Object font_range (ptrdiff_t, ptrdiff_t, ptrdiff_t *,
struct window *, struct face *,
Lisp_Object);
extern void font_fill_lglyph_metrics (Lisp_Object, Lisp_Object);
extern void font_fill_lglyph_metrics (Lisp_Object, struct font *, unsigned int);
extern Lisp_Object font_put_extra (Lisp_Object font, Lisp_Object prop,
Lisp_Object val);