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| author | Robert Pluim <rpluim@gmail.com> | 2020-01-24 14:11:44 +0100 |
|---|---|---|
| committer | Robert Pluim <rpluim@gmail.com> | 2020-03-02 09:59:34 +0100 |
| commit | fe1a447d52f548441d19af580ed11ef56d4459d2 (patch) | |
| tree | baa0419db5d8a8b7605c80b55cefe6fbefc0d7f6 /src/composite.c | |
| parent | b42b894d1def7180ab715615116fe6af65b76bd8 (diff) | |
| download | emacs-fe1a447d52f548441d19af580ed11ef56d4459d2.tar.gz emacs-fe1a447d52f548441d19af580ed11ef56d4459d2.tar.bz2 emacs-fe1a447d52f548441d19af580ed11ef56d4459d2.zip | |
Don't attempt to cache glyph metrics for FONT_INVALID_CODE
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.
Diffstat (limited to 'src/composite.c')
| -rw-r--r-- | src/composite.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/composite.c b/src/composite.c index 53e6930b5f2..364d5c9316e 100644 --- a/src/composite.c +++ b/src/composite.c @@ -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)); |