From 6be057f060543bb0f3ed9423904263617cdffffe Mon Sep 17 00:00:00 2001
From: NRK <nrk@disroot.org>
Date: Thu, 24 Mar 2022 02:00:00 +0600
Subject: introduce drw_fontset_getwidth_clamp()
getting the width of a string is an O(n) operation, and in many cases
users only care about getting the width upto a certain number.
instead of calling drw_fontset_getwidth() and *then* clamping the
result, this patch introduces drw_fontset_getwidth_clamp() function,
similar to strnlen(), which will stop once we reach n.
the `invert` parameter was overloaded internally to preserve the API,
however library users should be calling drw_fontset_getwidth_clamp() and
not depend upon internal behavior of drw_text().
---
drw.c | 19 +++++++++++++++++--
drw.h | 1 +
2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drw.c b/drw.c
index e65d069..7d985b1 100644
--- a/drw.c
+++ b/drw.c
@@ -268,7 +268,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
return 0;
if (!render) {
- w = ~w;
+ w = invert ? invert : ~invert;
} else {
XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
@@ -300,7 +300,13 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
if (ew + tmpw > w) {
overflow = 1;
- utf8strlen = ellipsis_len;
+ /* called from drw_fontset_getwidth_clamp():
+ * it wants the width AFTER the overflow
+ */
+ if (!render)
+ x += tmpw;
+ else
+ utf8strlen = ellipsis_len;
} else if (curfont == usedfont) {
utf8strlen += utf8charlen;
text += utf8charlen;
@@ -397,6 +403,15 @@ drw_fontset_getwidth(Drw *drw, const char *text)
return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
}
+unsigned int
+drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
+{
+ unsigned int tmp = 0;
+ if (drw && drw->fonts && text && n)
+ tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
+ return MIN(n, tmp);
+}
+
void
drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
{
diff --git a/drw.h b/drw.h
index 4c67419..fd7631b 100644
--- a/drw.h
+++ b/drw.h
@@ -35,6 +35,7 @@ void drw_free(Drw *drw);
Fnt *drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount);
void drw_fontset_free(Fnt* set);
unsigned int drw_fontset_getwidth(Drw *drw, const char *text);
+unsigned int drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n);
void drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h);
/* Colorscheme abstraction */
--
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