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bug#39133: 28.0.50; Emacs slowdown on special char
From: |
Robert Pluim |
Subject: |
bug#39133: 28.0.50; Emacs slowdown on special char |
Date: |
Fri, 24 Jan 2020 16:41:40 +0100 |
>>>>> On Fri, 24 Jan 2020 14:50:10 +0100, Robert Pluim <rpluim@gmail.com> said:
Robert> Yes, I worked that out. A simple crash, for once :-)
>From 667f47abecc13e8a47181f338e727d95e57a6354 Mon Sep 17 00:00:00 2001
From: Robert Pluim <rpluim@gmail.com>
Date: Fri, 24 Jan 2020 14:11:44 +0100
Subject: [PATCH] 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.
---
src/composite.c | 18 ++++++++++++++----
src/font.c | 4 +---
src/font.h | 2 +-
3 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/src/composite.c b/src/composite.c
index 53e6930b5f..364d5c9316 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));
diff --git a/src/font.c b/src/font.c
index bb39aef92d..2a45630061 100644
--- a/src/font.c
+++ b/src/font.c
@@ -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);
diff --git a/src/font.h b/src/font.h
index 0561e3c83f..8614e7fa10 100644
--- a/src/font.h
+++ b/src/font.h
@@ -886,7 +886,7 @@ valid_font_driver (struct font_driver const *d)
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);
--
2.23.0
- bug#39133: 28.0.50; Emacs slowdown on special char, (continued)
- bug#39133: 28.0.50; Emacs slowdown on special char, Robert Pluim, 2020/01/14
- bug#39133: 28.0.50; Emacs slowdown on special char, Eli Zaretskii, 2020/01/15
- bug#39133: 28.0.50; Emacs slowdown on special char, Robert Pluim, 2020/01/24
- bug#39133: 28.0.50; Emacs slowdown on special char, Eli Zaretskii, 2020/01/24
- bug#39133: 28.0.50; Emacs slowdown on special char, Robert Pluim, 2020/01/24
- bug#39133: 28.0.50; Emacs slowdown on special char, Eli Zaretskii, 2020/01/24
- bug#39133: 28.0.50; Emacs slowdown on special char, Robert Pluim, 2020/01/24
- bug#39133: 28.0.50; Emacs slowdown on special char,
Robert Pluim <=
- bug#39133: 28.0.50; Emacs slowdown on special char, Eli Zaretskii, 2020/01/24