Commit Graph

19 Commits (main)

Author SHA1 Message Date
Hiltjo Posthuma fce06f437d remove workaround for a crash with color emojis on some systems, now fixed in libXft 2.3.5
2022-09-17 15:32:26 +02:00
NRK 33685b06e9 drw_text: account for fallback fonts in ellipsis_width
additionally, ellipsis_width (which shouldn't change) is made static to
avoid re-calculating it on each drw_text() call.
2022-04-16 16:21:01 +02:00
NRK e4827b0c40 drw_text: don't segfault when called with 0 width
this patch just rejects *any* 0 width draws, which is surely an error by
the caller.

this also guards against cases where the width is too small for the
ellipsis to fit, so ellipsis_w will remain 0.
reported by Bakkeby <>
2022-04-16 16:21:01 +02:00
NRK 22511c41d5 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
2022-03-25 22:49:07 +01:00
NRK 6be057f060 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().
2022-03-25 22:49:07 +01:00
NRK 41fdabbf7c 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
	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

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 <>, thanks! however the original patch had
some issues incorrectly truncating the prompt (-p flag) and cutting off
emojies. those have been fixed in here.
2022-03-25 22:49:07 +01:00
Hiltjo Posthuma d78ff08d99 Revert "Improve speed of drw_text when provided with large strings"
This reverts commit c585e8e498.

It causes issues with truncation of characters when the text does not fit and
so on.  The patch should be reworked and properly tested.
2021-08-20 23:05:53 +02:00
Miles Alan c585e8e498 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.
2021-08-09 18:20:51 +02:00
Hiltjo Posthuma 9b38fda6fe Fix memory leaks in drw
Synced from dwm.
Patch by Alex Flierl <>, thanks.
2020-06-11 18:45:33 +02:00
Anselm R Garbe 65be875f5a Prepared 4.9 release. 2019-02-02 04:54:15 -08:00
Hiltjo Posthuma f0a5b75d6a drw: drw_scm_create: use Clr type
in this context XftColor is a too low-level type.
2017-11-03 21:10:38 +01:00
Hiltjo Posthuma 026827fd65 die() consistency: always add newline 2016-08-12 14:39:30 +02:00
Markus Teich 44c7de3dcf 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)
2016-06-03 19:13:15 +02:00
Hiltjo Posthuma 44b242c763 drw: cleanup drw_text, prevent gcc warning false-positive of unused var
... we don't allow passing text is NULL anymore either, for that behaviour
just use drw_rect() (it is used in dwm).
2015-10-20 22:56:57 +02:00
Hiltjo Posthuma e2e7fcb219 drw: simplify drw_font_xcreate and prevent a potential unneeded allocation 2015-10-20 22:55:39 +02:00
Hiltjo Posthuma 1f2226df13 drw: a valid (non-NULL) Drw and Fnt context must be passed
don't do these checks on this level. However for resource drw_*_free
we will allow it.
2015-10-20 22:53:55 +02:00
Hiltjo Posthuma 5a20b409c6 add sbase-style ecalloc(), calloc: or die
... remove intermediary variables
2015-10-20 22:51:57 +02:00
Hiltjo Posthuma 03cb1ec55a drw style improvements
this makes the code-style more consistent aswell.
2015-09-27 23:56:02 +02:00
Hiltjo Posthuma 4b1fecd44e 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
2015-06-27 21:47:10 +02:00