significantly improve performance on large strings
this replaces inefficient pattern of `MIN(TEXTW(..), n)` with drw_fontset_getwidth_clamp() instead, which is far more efficient when we only want up to a certain width. dumping a decently sized (unicode) emoji file into dmenu, I see the startup time drop significantly with this patch. before -> after 360ms -> 160ms this should also noticeably improve input latency (responsiveness) given that calcoffsets() and drawmenu() are pretty hot functions.
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parent
6be057f060
commit
7269c5355d
13
dmenu.c
13
dmenu.c
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@ -58,6 +58,13 @@ static Clr *scheme[SchemeLast];
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static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
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static char *(*fstrstr)(const char *, const char *) = strstr;
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static unsigned int
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textw_clamp(const char *str, unsigned int n)
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{
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unsigned int w = drw_fontset_getwidth_clamp(drw, str, n) + lrpad;
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return MIN(w, n);
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}
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static void
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appenditem(struct item *item, struct item **list, struct item **last)
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{
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@ -82,10 +89,10 @@ calcoffsets(void)
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n = mw - (promptw + inputw + TEXTW("<") + TEXTW(">"));
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/* calculate which items will begin the next page and previous page */
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for (i = 0, next = curr; next; next = next->right)
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if ((i += (lines > 0) ? bh : MIN(TEXTW(next->text), n)) > n)
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if ((i += (lines > 0) ? bh : textw_clamp(next->text, n)) > n)
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break;
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for (i = 0, prev = curr; prev && prev->left; prev = prev->left)
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if ((i += (lines > 0) ? bh : MIN(TEXTW(prev->left->text), n)) > n)
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if ((i += (lines > 0) ? bh : textw_clamp(prev->left->text, n)) > n)
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break;
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}
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@ -172,7 +179,7 @@ drawmenu(void)
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}
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x += w;
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for (item = curr; item != next; item = item->right)
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x = drawitem(item, x, 0, MIN(TEXTW(item->text), mw - x - TEXTW(">")));
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x = drawitem(item, x, 0, textw_clamp(item->text, mw - x - TEXTW(">")));
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if (next) {
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w = TEXTW(">");
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drw_setscheme(drw, scheme[SchemeNorm]);
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