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wezterm/termwiz
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Wez Furlong 00ddfbf9b8 perf: cache quads by line 
Introduces a heap-based quad allocator that we cache on a per-line
basis, so if a line is unchanged we simply need to copy the previously
computed set of quads for it into the gpu quad buffer.

The results are encouraging wrt. constructing those quads; the
`quad_buffer_apply` is the cost of the copy operation, compare with
`render_screen_line_opengl` which is the cost of computing the quads;
it's 300x better at the p50 and >100x better at p95 for a full-screen
updating program:

full 2880x1800 screen top:

```
STAT                                             p50      p75      p95
Key(quad_buffer_apply)                           2.26µs   5.22µs   9.60µs
Key(render_screen_line_opengl)                   610.30µs 905.22µs 1.33ms
Key(gui.paint.opengl)                            35.39ms  37.75ms  45.88ms
```

However, the extra buffering does increase the latency of
`gui.paint.opengl` (the overall cost of painting a frame); contrast the
above with the latency in the same scenario with the current `main`
(rather than this branch):

```
Key(gui.paint.opengl)                            19.14ms  21.10ms  28.18ms
```

Note that for an idle screen this latency is ~1.5ms but that is also true
of `main`.

While the overall latency in the histogram isn't a slam dunk,
running `time cat bigfile` is ~10% faster on my mac.

I'm sure there's something that can be shaved off to get a more
convincing win.
2022-08-23 06:37:12 -07:00
..
benches termwiz: add bench for Cell creation/drop 2022-07-22 19:23:53 -07:00
codegen termwiz: add static WcLookupTable to codegen 2022-07-22 19:23:14 -07:00
data Respect emoji-variation-sequences.txt 2021-11-25 14:37:24 -07:00
examples really fix termwiz --all-features build 2022-07-26 22:35:49 -07:00
fuzz Add fuzzer for termwiz::escape::parser 2022-05-14 08:18:08 -07:00
src perf: cache quads by line 2022-08-23 06:37:12 -07:00
Cargo.toml termwiz: fix min version dep on winapi. publish 0.17.1 2022-08-02 18:21:49 -07:00
LICENSE.md restructure termwiz tree prior to merging into wezterm repo 2018-08-05 07:55:30 -07:00
README.md termwiz: cut 0.9.0 release 2020-05-17 12:05:46 -07:00

README.md

Terminal Wizardry

This is a rust crate that provides a number of support functions for applications interested in either displaying data to a terminal or in building a terminal emulator.

It is currently in active development and subject to fairly wild sweeping changes.

Included functionality:

  • Surface models a terminal display and its component Cells
  • Terminal attributes are aware of modern features such as True Color, Hyperlinks and will also support sixel and iterm style terminal graphics display.
  • Surfaces include a log of Changes and an API for consuming and applying deltas. This is a powerful building block for synchronizing screen instances.
  • Escape sequence parser decodes inscrutable escape sequences and gives them semantic meaning, making the code that uses them clearer. The decoded escapes can be re-encoded, allowing applications to start with the semantic meaning and emit the appropriate escape sequence without embedding obscure binary bytes.
  • Capabilities allows probing for terminal capabilities that may not be included in the system terminfo database, and overriding them in an embedding application.
  • Terminal trait provides an abstraction over unix style ttys and Windows style console APIs. Changes from Surface can be rendered to Terminals. Terminals allow decoding mouse and keyboard inputs in both blocking or non-blocking mode.
  • Widget trait allows composition of UI elements at a higher level.
  • LineEditor implements shell-like line editing functionality.

Windows Support

Termwiz understands how to work with both the legacy console APIs and the new PTY and virtual terminal features available in Windows 10, allowing for true color terminal applications on Windows 10.

Documentation

https://docs.rs/termwiz