### Run KAS GUI Project Examples

Source: https://github.com/kas-gui/kas/wiki/Getting-started

Instructions to clone the KAS GUI repository and execute various examples, including the `gallery` and `mandlebrot` applications, using the `cargo run` command.

```sh
git clone https://github.com/kas-gui/kas.git
cd kas
cargo run --example gallery
cd examples/mandlebrot; cargo run
```

--------------------------------

### Install KAS GUI Linux Development Dependencies

Source: https://github.com/kas-gui/kas/wiki/Getting-started

Commands for installing required Linux libraries such as `libxcb`, `libharfbuzz`, and `glslc` on Ubuntu and Fedora, which are necessary for KAS GUI development, especially for GLSL shaders or HarfBuzz usage.

```sh
# For Ubuntu:
sudo apt-get install build-essential git libxcb-shape0-dev libxcb-xfixes0-dev libharfbuzz-dev

# For Fedora:
sudo dnf install libxcb-devel harfbuzz-devel glslc
```

--------------------------------

### Build KAS GUI Local API Documentation

Source: https://github.com/kas-gui/kas/wiki/Getting-started

Command to generate local API documentation for the KAS GUI project. This uses `rustdoc` with specific `RUSTDOCFLAGS` and requires the nightly Rust toolchain to enable `doc_cfg` features.

```sh
RUSTDOCFLAGS="--cfg doc_cfg" cargo +nightly doc --features=nightly --all --no-deps --open
```

--------------------------------

### Configure Cargo for Faster Rust Builds with LLD Linker

Source: https://github.com/kas-gui/kas/wiki/Getting-started

TOML configuration snippet to be placed in `$HOME/.cargo/config`. This configuration instructs Cargo to use the LLD linker, significantly speeding up Rust compilation times.

```toml
[build]
rustflags = ["-C", "link-arg=-fuse-ld=lld"]
```

--------------------------------

### Prefer Discrete GPU for KAS (Bash)

Source: https://github.com/kas-gui/kas/wiki/Troubleshooting

This snippet shows how to set the `KAS_POWER_PREFERENCE` environment variable to `HighPerformance`. This instructs KAS to prefer a discrete GPU over integrated graphics, which can improve rendering performance for demanding applications.

```bash
export KAS_POWER_PREFERENCE=HighPerformance
```

--------------------------------

### KAS Invalid Widget ID Panic (Log)

Source: https://github.com/kas-gui/kas/wiki/Troubleshooting

This code block displays an example of a panic message encountered in KAS when an `Id` is invalid, typically due to a widget field lacking the `#[widget]` attribute in Rust. The message includes the file and line number where the panic occurred and a hint for obtaining a backtrace.

```log
thread 'main' panicked at 'Id::eq: invalid id', crates/kas-core/src/core/widget_id.rs:544:62
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

--------------------------------

### Force KAS Graphics Backend (Bash)

Source: https://github.com/kas-gui/kas/wiki/Troubleshooting

This snippet demonstrates how to set the `KAS_BACKENDS` environment variable to explicitly force KAS to use a specific graphics backend, such as OpenGL (GL). This can be useful for compatibility or performance tuning.

```bash
export KAS_BACKENDS=GL
```

--------------------------------

### Configure KAS GUI with Environment Variables

Source: https://github.com/kas-gui/kas/wiki/Configuration

This snippet demonstrates how to set environment variables (`KAS_CONFIG`, `KAS_THEME_CONFIG`, `KAS_CONFIG_MODE`) to control KAS GUI configuration file paths and access modes. It also shows how to optionally force default file creation and run a KAS example.

```sh
export KAS_CONFIG=kas.yaml
export KAS_THEME_CONFIG=theme.yaml
export KAS_CONFIG_MODE=readwrite

# Optionally, force creation of default files:
KAS_CONFIG_MODE=WriteDefault cargo run --example gallery

# Now, just run:
cargo run --example gallery
```

--------------------------------

### Set Winit X11 Display Scale Factor

Source: https://github.com/kas-gui/kas/wiki/Configuration

This snippet provides an example of how to explicitly set the display scale factor for Winit applications on X11 using the `WINIT_X11_SCALE_FACTOR` environment variable. This is useful when automatic scale factor detection might not work correctly.

```sh
export WINIT_X11_SCALE_FACTOR=1.5
```

--------------------------------

### Optimize Rust Binary Size for Release Builds

Source: https://github.com/kas-gui/kas/blob/master/README.md

This TOML configuration snippet is added to the `Cargo.toml` file under the `[profile.release]` section. It enables stripping of debug symbols and sets the optimization level to 'z' (optimize for size), significantly reducing the final binary size of a Rust application.

```TOML
[profile.release]
strip = true
opt-level = "z"
```

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