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authorNRK2022-03-24 00:37:55 +0600
committerHiltjo Posthuma2022-03-25 22:49:07 +0100
commit22511c41d55a38a770541ae617a09383d5e6ad1c (patch)
tree2239b8590d3bff0212ccf56e6f3c9fdcefcce5fe
parent77526f756e23e362081ac807521f901f2e5cd5e6 (diff)
drw_text: improve performance when there's no match
this was the last piece of the puzzle, the case where we can't find any font to draw the codepoint. in such cases, we use XftFontMatch() which is INSANELY slow. but that's not the real problem. the real problem was we were continuously trying to match the same thing over and over again. this patch introduces a small cache, which keeps track a couple codepoints for which we know we won't find any matches. with this, i can dump lots of emojies into dmenu where some of them don't have any matching font, and still not have dmenu lag insanely or FREEZE completely when scrolling up and down. this also improves startup time, which will of course depend on the system and all installed fonts; but on my system and test case i see the following startup time drop: before -> after 60ms -> 34ms
-rw-r--r--drw.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drw.c b/drw.c
index 7d985b1..a50c9ee 100644
--- a/drw.c
+++ b/drw.c
@@ -251,7 +251,7 @@ drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int
int
drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
{
- int ty, ellipsis_x = 0;
+ int i, ty, ellipsis_x = 0;
unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, ellipsis_width;
XftDraw *d = NULL;
Fnt *usedfont, *curfont, *nextfont;
@@ -263,6 +263,9 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
FcPattern *match;
XftResult result;
int charexists = 0, overflow = 0;
+ /* keep track of a couple codepoints for which we have no match. */
+ enum { nomatches_len = 64 };
+ static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
return 0;
@@ -346,6 +349,12 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
* character must be drawn. */
charexists = 1;
+ for (i = 0; i < nomatches_len; ++i) {
+ /* avoid calling XftFontMatch if we know we won't find a match */
+ if (utf8codepoint == nomatches.codepoint[i])
+ goto no_match;
+ }
+
fccharset = FcCharSetCreate();
FcCharSetAddChar(fccharset, utf8codepoint);
@@ -374,6 +383,8 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
curfont->next = usedfont;
} else {
xfont_free(usedfont);
+ nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
+no_match:
usedfont = drw->fonts;
}
}