Demo for the swash font library

Chad Brokaw

Last update: Nov 29, 2022

Related tags

Miscellaneous swash_demo

Overview

Demo for the swash crate

See the swash repo or crate for the actual project.

This is a chunk of very rough code. It's essentially a packed up version of my own personal playground I've been using for testing swash throughout development. You will break it. It will crash. You are likely to be eaten by a grue.

It was tested most recently (as in, just before release) on a Mac. So you'll have the best luck there. It will probably work on Windows. I have no idea if it still works on Linux, but if not, feel free to file issues and I'll take a look. Linux hasn't received much focus as of yet, but I do consider it a priority platform for the project. (Note that swash itself has zero platform specific dependencies and works perfectly well on Linux or any other OS)

If you don't feel up to running it, or (more likely) it won't run, check out the swash_and_textedit.png screenshot in the repo root.

This currently requires OpenGL 4.1.

Usage

cargo run --release

Keys:

F1: toggle dark and light modes
F2: left align
F3: center align
F4: right align

If you're brave and really want to break it, basic editing does "work". Arrow keys, selection, cut, copy, paste, etc.

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Comments

The scope of the unsafe block can be appropriately reduced

In this function you use the unsafe keyword for almost the entrie function body.

We need to mark unsafe operations more precisely using unsafe keyword. Keeping unsafe blocks small can bring many benefits. For example, when mistakes happen, we can locate any errors related to memory safety within an unsafe block. This is the balance between Safe and Unsafe Rust. The separation is designed to make using Safe Rust as ergonomic as possible, but requires extra effort and care when writing Unsafe Rust.

Hope this PR can help you. Best regards. References https://doc.rust-lang.org/nomicon/safe-unsafe-meaning.html https://doc.rust-lang.org/book/ch19-01-unsafe-rust.html

opened by cactter 0

Crashes on Linux (Wayland)

Could be a missing dependency somewhere:

Pixel format of the window's GL context: PixelFormat { hardware_accelerated: true, color_bits: 24, alpha_bits: 8, depth_bits: 24, stencil_bits: 8, stereoscopy: false, double_buffer: true, multisampling: None, srgb: false }
OpenGL version 4.6 (Core Profile) Mesa 21.3.7
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', swash_demo/src/layout/layout.rs:253:37
stack backtrace:
   0: rust_begin_unwind
             at /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/panicking.rs:116:14
   2: core::panicking::panic
             at /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/panicking.rs:48:5
   3: core::option::Option<T>::unwrap
             at /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/option.rs:729:21
   4: swash_demo::layout::layout::<impl swash_demo::layout::Paragraph>::finish
             at ./src/layout/layout.rs:253:9
   5: swash_demo::layout::builder::ParagraphBuilder::build_into
             at ./src/layout/builder.rs:271:9
   6: swash_demo::main::{{closure}}
             at ./src/main.rs:404:21
   7: winit::platform_impl::platform::sticky_exit_callback
             at /home/speed/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/linux/mod.rs:736:5
   8: winit::platform_impl::platform::wayland::event_loop::EventLoop<T>::run_return
             at /home/speed/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/linux/wayland/event_loop/mod.rs:376:21
   9: winit::platform_impl::platform::wayland::event_loop::EventLoop<T>::run
             at /home/speed/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/linux/wayland/event_loop/mod.rs:191:9
  10: winit::platform_impl::platform::EventLoop<T>::run
             at /home/speed/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/linux/mod.rs:652:56
  11: winit::event_loop::EventLoop<T>::run
             at /home/speed/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/event_loop.rs:154:9
  12: swash_demo::main
             at ./src/main.rs:77:5
  13: core::ops::function::FnOnce::call_once
             at /rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/ops/function.rs:227:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

opened by archseer 0