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// Copyright 2019 the Piet Authors
// SPDX-License-Identifier: Apache-2.0 OR MIT
//! Basic example of rendering on Cairo.
use std::fmt::Write as _;
use std::path::Path;
use std::process::Command;
use piet::{samples, RenderContext};
use piet_common::Device;
const FILE_PREFIX: &str = "cairo-test";
fn main() {
let sys_info = additional_system_info();
samples::samples_main(run_sample, FILE_PREFIX, Some(&sys_info));
}
fn run_sample(
number: usize,
scale: f64,
save_path: &Path,
) -> Result<(), Box<dyn std::error::Error>> {
let sample = samples::get(number)?;
let size = sample.size() * scale;
let mut device = Device::new()?;
let mut target = device.bitmap_target(size.width as usize, size.height as usize, scale)?;
let mut piet_context = target.render_context();
sample.draw(&mut piet_context)?;
piet_context.finish()?;
std::mem::drop(piet_context);
target.save_to_file(save_path).map_err(Into::into)
}
fn additional_system_info() -> String {
let mut r = String::new();
append_lib_version("libpango1.0", &mut r);
append_lib_version("libcairo2", &mut r);
r
}
fn append_lib_version(package_name: &str, buf: &mut String) {
let version = get_version_from_apt(package_name);
write!(buf, "{package_name:16}").expect("Failed to write package name to string");
buf.push_str(version.as_deref().unwrap_or("not found"));
buf.push('\n')
}
fn get_version_from_apt(package: &str) -> Option<String> {
let output = match Command::new("aptitude")
.arg("show")
.arg(package)
.output()
.or_else(|_| Command::new("apt-cache").arg("show").arg(package).output())
{
Ok(output) => output,
Err(e) => {
eprintln!("failed to get package version: '{e}'");
return None;
}
};
let output = if output.status.success() {
String::from_utf8(output.stdout).expect("malformed utf8")
} else {
eprintln!("apt-cache failed {:?}", &output);
return None;
};
output
.lines()
.find(|s| s.trim().starts_with("Version"))
.and_then(|line| line.split(':').last().map(|s| s.trim().to_owned()))
}
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