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use super::{Image, ImageMix, MixMode};
pub trait ImageCompare {
/// Find differences. The parameter order does not matter. Yields the same result.
///
/// Set `value=1` where the two images disagree.
///
/// Set `value=0` where the two images agree.
///
/// The two images must have the same size. Otherwise an `Err` is returned.
fn diff(&self, other: &Image) -> anyhow::Result<Image>;
/// Find differences, considers only pixels with `color` in the `self` image.
///
/// The parameter order matters.
/// Similar to doing a subtraction `self - other`, and return what remains.
///
/// Set `value=1` where the two images disagree. And the `self` pixel is `color`.
///
/// Set `value=0` where the two images agree. Or the `self` pixel is different than `color`.
///
/// The two images must have the same size. Otherwise an `Err` is returned.
fn diff_color(&self, other: &Image, color: u8) -> anyhow::Result<Image>;
}
impl ImageCompare for Image {
fn diff(&self, other: &Image) -> anyhow::Result<Image> {
self.mix(other, MixMode::IsDifferent)
}
fn diff_color(&self, other: &Image, color: u8) -> anyhow::Result<Image> {
self.mix(other, MixMode::IsDifferentOnlyConsideringColor0 { color })
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::arc::ImageTryCreate;
#[test]
fn test_10000_diff_is_same() {
// Arrange
let pixels: Vec<u8> = vec![
1, 2, 3,
4, 5, 6,
];
let input: Image = Image::try_create(3, 2, pixels).expect("image");
// Act
let actual: Image = input.diff(&input).expect("image");
// Assert
let expected: Image = Image::zero(3, 2);
assert_eq!(actual, expected);
}
#[test]
fn test_10001_diff_empty() {
// Arrange
let input: Image = Image::empty();
// Act
let actual: Image = input.diff(&input).expect("image");
// Assert
let expected: Image = Image::empty();
assert_eq!(actual, expected);
}
#[test]
fn test_10002_diff_is_different() {
// Arrange
let pixels0: Vec<u8> = vec![
1, 2, 3,
4, 5, 6,
];
let input0: Image = Image::try_create(3, 2, pixels0).expect("image");
let pixels1: Vec<u8> = vec![
1, 2, 9,
9, 5, 6,
];
let input1: Image = Image::try_create(3, 2, pixels1).expect("image");
// Act
let actual: Image = input0.diff(&input1).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
0, 0, 1,
1, 0, 0,
];
let expected: Image = Image::try_create(3, 2, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_10003_diff_error_must_be_same_size() {
// Arrange
let pixels0: Vec<u8> = vec![
1, 2, 3,
4, 5, 6,
];
let input0: Image = Image::try_create(3, 2, pixels0).expect("image");
let pixels1: Vec<u8> = vec![
1, 2,
4, 5,
];
let input1: Image = Image::try_create(2, 2, pixels1).expect("image");
// Act
let error = input0.diff(&input1).expect_err("is supposed to fail");
// Assert
let s = format!("{:?}", error);
assert_eq!(s.contains("must have same size"), true);
}
#[test]
fn test_20000_diff_color_identical() {
// Arrange
let pixels: Vec<u8> = vec![
5, 5, 3,
4, 5, 5,
];
let input: Image = Image::try_create(3, 2, pixels).expect("image");
// Act
let actual: Image = input.diff_color(&input, 5).expect("image");
// Assert
let expected: Image = Image::zero(3, 2);
assert_eq!(actual, expected);
}
#[test]
fn test_20001_diff_color_subset() {
// Arrange
let pixels0: Vec<u8> = vec![
5, 5, 3,
4, 5, 5,
];
let input0: Image = Image::try_create(3, 2, pixels0).expect("image");
let pixels1: Vec<u8> = vec![
5, 5, 5,
4, 5, 5,
];
let input1: Image = Image::try_create(3, 2, pixels1).expect("image");
// Act
let actual: Image = input0.diff_color(&input1, 5).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
0, 0, 0,
0, 0, 0,
];
let expected: Image = Image::try_create(3, 2, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_20002_diff_color_different() {
// Arrange
let pixels0: Vec<u8> = vec![
5, 5, 3,
4, 5, 5,
];
let input0: Image = Image::try_create(3, 2, pixels0).expect("image");
let pixels1: Vec<u8> = vec![
5, 5, 3,
4, 5, 3,
];
let input1: Image = Image::try_create(3, 2, pixels1).expect("image");
// Act
let actual: Image = input0.diff_color(&input1, 5).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
0, 0, 0,
0, 0, 1,
];
let expected: Image = Image::try_create(3, 2, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
}
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