Grcov report - geometries.rs

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//! Tests for the data files from https://github.com/horizon-eda/horizon/

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//!

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//! Horizon is an app Electronic Design Automation.  It has SVG templates with specially

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//! named elements; the app extracts their geometries and renders GUI widgets instead of

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//! those elements.  So, it is critical that the geometries get computed accurately.

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//!

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//! Horizon's build system pre-computes the geometries of the SVG templates' elements, and

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//! stores them in JSON files.  You can see the SVGs and the .subs JSON files in the

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//! tests/fixtures/horizon in the librsvg source tree.

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//!

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//! This test file has machinery to load the SVG templates, and the JSON files with the

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//! expected geometries.  The tests check that librsvg computes the same geometries every

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//! time.

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use anyhow::{Context, Result};

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use rsvg::tests_only::Rect;

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use rsvg::{CairoRenderer, LengthUnit, Loader};

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use serde::Deserialize;

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use std::collections::BTreeMap;

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use std::fs;

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use std::path::Path;

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// Copy of cairo::Rectangle

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//

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// Somehow I can't make serde's "remote" work here, in combination with the BTreeMap below...

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#[derive(Copy, Clone, Deserialize, Debug, PartialEq)]

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struct Rectangle {

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    x: f64,

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    y: f64,

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    width: f64,

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    height: f64,

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impl From<Rectangle> for Rect {

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    fn from(r: Rectangle) -> Rect {

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        Rect {

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            x0: r.x,

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            y0: r.y,

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            x1: r.x + r.width,

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            y1: r.y + r.height,

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#[derive(Deserialize)]

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struct Geometries(BTreeMap<String, Rectangle>);

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fn read_geometries(path: &Path) -> Result<Geometries> {

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    let contents = fs::read_to_string(path).context(format!("could not read {:?}", path))?;

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    serde_json::from_str(&contents).context(format!("could not parse JSON from {:?}", path))

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4

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// We create a struct with the id and geometry so that

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// assert_eq!() in the tests will print out the element name for failures.

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#[derive(Debug, PartialEq)]

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struct Element {

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    id: String,

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    geom: Rect,

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macro_rules! assert_rectangles_approx_eq {

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    ($id:expr, $expected:expr, $computed:expr) => {

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        if !$expected.approx_eq(&$computed) {

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            eprintln!(

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                "assertion failed: rectangles are not approximately equal for id={}",

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$id

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);

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            eprintln!("  expected: {:?}", $expected);

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            eprintln!("  computed: {:?}", $computed);

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            panic!();

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};

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fn test(svg_filename: &str) {

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    let mut geometries_filename = String::from(svg_filename);

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    geometries_filename.push_str(".subs");

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    let geometries =

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        read_geometries(Path::new(&geometries_filename)).expect("reading geometries JSON");

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    let handle = Loader::new()

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        .read_path(svg_filename)

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        .expect("reading geometries SVG");

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    let renderer = CairoRenderer::new(&handle);

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    let dimensions = renderer.intrinsic_dimensions();

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    let (svg_width, svg_height) = renderer

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        .intrinsic_size_in_pixels()

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        .expect("intrinsic size in pixels");

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    assert!(matches!(dimensions.width.unit, LengthUnit::Px));

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    assert!(matches!(dimensions.height.unit, LengthUnit::Px));

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    assert_eq!(dimensions.width.length, svg_width);

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    assert_eq!(dimensions.height.length, svg_height);

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    for (id, expected) in geometries.0.iter() {

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        println!("id: {}", id);

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        let expected = Element {

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            id: String::from(id),

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            geom: Rect::from(*expected),

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};

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        let viewport = cairo::Rectangle::new(0.0, 0.0, svg_width, svg_height);

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        let (geometry, _) = renderer

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            .geometry_for_layer(Some(id), &viewport)

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            .unwrap_or_else(|_| panic!("getting geometry for {}", id));

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        let computed = Element {

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            id: String::from(id),

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            geom: geometry.into(),

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};

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        assert_rectangles_approx_eq!(id, expected.geom, computed.geom);

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#[test]

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fn dual() {

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    test("tests/fixtures/geometries/dual.svg");

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#[test]

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fn grid() {

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    test("tests/fixtures/geometries/grid.svg");

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#[test]

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fn quad() {

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    test("tests/fixtures/geometries/quad.svg");

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#[test]

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fn single() {

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    test("tests/fixtures/geometries/single.svg");

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