NRK [Wed, 23 Mar 2022 18:37:55 +0000 (00:37 +0600)]
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:
NRK [Wed, 23 Mar 2022 18:37:55 +0000 (00:37 +0600)]
inputw: improve correctness and startup performance
a massive amount of time inside readstdin() is spent trying to get the
max input width and then put it into inputw, only for it to get clamped
down to mw/3 inside setup().
it makes more sense to calculate inputw inside setup() once we have mw
available. similar to the last patch, i see noticeable startup
performance improvement:
before -> after
160ms -> 60ms
additionally this will take fallback fonts into account compared to the
previous version, so it's not only more performant but also more correct.
NRK [Wed, 23 Mar 2022 20:04:04 +0000 (02:04 +0600)]
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.
NRK [Wed, 23 Mar 2022 20:00:00 +0000 (02:00 +0600)]
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().
NRK [Wed, 23 Mar 2022 18:37:55 +0000 (00:37 +0600)]
drw_text: improve both performance and correctness
this patch makes some non-trivial changes, which significantly improves
the performance of drawing large strings as well as fixes any issues
regarding the printing of the ellipsis when string gets truncated.
* performance:
before there were two O(n) loops, one which finds how long we can go
without changing font, and the second loop would (incorrectly) truncate
the string if it's too big.
this patch merges the overflow calculation into the first loop and exits
out when overflow is detected. when dumping lots of emojies into dmenu,
i see some noticeable startup time improvement:
before -> after
460ms -> 360ms
input latency when scrolling up/down is also noticeably better and can
be tested with the following:
for _ in $(seq 20); do
cat /dev/urandom | base64 | tr -d '\n' | head -c 1000000
echo
done | ./dmenu -l 10
* correctness:
the previous version would incorrectly assumed single byte chars and
would overwrite them with '.' , this caused a whole bunch of obvious
problems, including the ellipsis not getting rendered if then font
changed.
in addition to exiting out when we detect overflow, this patch also
keeps track of the last x-position where the ellipsis would fit. if we
detect overflow, we simply make a recursing call to drw_text() at the
ellipsis_x position and overwrite what was there.
so now the ellipsis will always be printed properly, regardless of
weather the font changes or if the string is single byte char or not.
the idea of rendering the ellipsis on top incase of overflow was
from Bakkeby <bakkeby@gmail.com>, thanks! however the original patch had
some issues incorrectly truncating the prompt (-p flag) and cutting off
emojies. those have been fixed in here.
Hiltjo Posthuma [Mon, 9 Aug 2021 16:39:25 +0000 (18:39 +0200)]
add support for more keypad keys
The keypad Enter key was already supported. On some keyboard layouts like my
laptop the page-up and page-down key is more comfortable to use.
This adds a few lines but no complexity.
Miles Alan [Sun, 8 Aug 2021 01:34:35 +0000 (21:34 -0400)]
Improve speed of drw_text when provided with large strings
Calculates len & ew in drw_font_getexts loop by incrementing instead of
decrementing; as such avoids proportional increase in time spent in loop
based on provided strings size.
Omar Sandoval [Fri, 3 Nov 2017 16:49:10 +0000 (09:49 -0700)]
Set class name on menu window
WM_CLASS is a standard ICCCM property which is used to identify windows.
Window managers and compositors use it to allow per-application
configurable behavior.
When the input text fully matches a single item, do not draw the item
and highlight the input text to show that it matches an item in
opposition to regular input text not matching anything.
Markus Teich [Sat, 21 May 2016 19:51:14 +0000 (21:51 +0200)]
import new drw from libsl and minor fixes.
- extract drawitem function (code deduplication)
- fix bug where inputw was not correctly calculated from the widest item, but
just from the one with the longest strlen() which is not the same. It's better
now, but does not account for fallback fonts, since it would be too slow to
calculate all the correct item widths on startup.
- minor code style fixes (indentation, useless line breaks)
Hiltjo Posthuma [Sun, 4 Oct 2015 10:32:07 +0000 (12:32 +0200)]
fix paste from clipboard (ctrl+shift+y)
from Joshua Lloret on the ML:
"attached is a small patch to enable pasting from clipboard, as well as primary.
It seems like there was already code in there to allow this, but since there was never any case to match the upper case 'Y', that inline if would always evaluate to false."
Adds clarity. Typedefs for structs are definitely a discussion matter,
but there's no reason to hide a simple data-structure behind a
meaningless typedef.
Hiltjo Posthuma [Mon, 4 May 2015 19:54:46 +0000 (21:54 +0200)]
Use libdraw: add Xft and fallback-fonts support to graphics lib
- libdraw, util: add drw.{c,h}, util.{c,h} and update code.
- libdraw: fix drw_rect(): use w and h parameter.
- libdraw: print errstr if last character in string was ":" (sbase).
- libdraw: drw_clr_free() allow valid free(NULL).
- config.def.h: set default font to monospace.
- cleanup() on exit.
- LICENSE: update license string for dmenu -v to 2015.
- LICENSE: add myself to LICENSE