cranpose-render-common 0.1.164

Common rendering contracts for Cranpose
Documentation 
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use super::*;

#[test]
fn union_rect_ignores_empty_rhs() {
    let lhs = Some(Rect {
        x: 1.0,
        y: 2.0,
        width: 3.0,
        height: 4.0,
    });
    let rhs = Rect {
        x: 5.0,
        y: 6.0,
        width: 0.0,
        height: 7.0,
    };

    assert_eq!(union_rect(lhs, rhs), lhs);
}

#[test]
fn union_rect_merges_extents() {
    let lhs = Some(Rect {
        x: 8.0,
        y: 4.0,
        width: 3.0,
        height: 5.0,
    });
    let rhs = Rect {
        x: 2.0,
        y: 7.0,
        width: 12.0,
        height: 4.0,
    };

    assert_eq!(
        union_rect(lhs, rhs),
        Some(Rect {
            x: 2.0,
            y: 4.0,
            width: 12.0,
            height: 7.0,
        })
    );
}

#[test]
fn a_blur_reaches_its_kernel_and_its_scratch_blocks_past_the_source() {
    assert_eq!(blur_reach_px(0.0), 1.0);
    assert_eq!(blur_reach_px(-5.0), 1.0);
    assert_eq!(blur_reach_px(2.0), 6.0);
    assert_eq!(blur_reach_px(10.0), 18.0);
    assert_eq!(blur_reach_px(44.0), 60.0);
    assert_eq!(blur_reach_px(200.0), 144.0);
}

#[test]
fn the_logical_reach_follows_the_device_scale() {
    assert_eq!(blur_reach(2.0, 1.0), 6.0);
    assert!((blur_reach(20.0, 2.25) - 60.0 / 2.25).abs() < 1e-5);
    assert_eq!(blur_reach(2.0, 0.0), 6.0);
    assert_eq!(blur_reach(2.0, f32::NAN), 6.0);
}

#[test]
fn expand_blurred_rect_applies_margin_and_clip() {
    let expanded = expand_blurred_rect(
        Rect {
            x: 10.0,
            y: 20.0,
            width: 30.0,
            height: 40.0,
        },
        2.0,
        1.0,
        Some(Rect {
            x: 8.0,
            y: 18.0,
            width: 20.0,
            height: 20.0,
        }),
    );

    assert_eq!(
        expanded,
        Some(Rect {
            x: 8.0,
            y: 18.0,
            width: 20.0,
            height: 20.0,
        })
    );
}