import { expect, test, describe } from "vitest";
import { colorDiff, scan } from "./index.js";
import { JimpClass } from "@jimp/types";
// Convert [0..1] float to a percent value with only one decimal.
const pct = (n: number) => ((n * 1000) << 0) / 10;
describe("colorDiff", () => {
test("totally opaque (no alpha defined)", () => {
expect(colorDiff({ r: 255, g: 0, b: 0 }, { r: 255, g: 0, b: 0 })).toEqual(
0
);
expect(
pct(colorDiff({ r: 255, g: 0, b: 0 }, { r: 0, g: 0, b: 0 }))
).toEqual(33.3);
expect(
pct(colorDiff({ r: 255, g: 0, b: 0 }, { r: 0, g: 255, b: 0 }))
).toEqual(66.6);
expect(colorDiff({ r: 255, g: 0, b: 0 }, { r: 0, g: 255, b: 255 })).toEqual(
1
);
expect(colorDiff({ r: 0, g: 0, b: 0 }, { r: 255, g: 255, b: 255 })).toEqual(
1
);
});
test("totally transparent", () => {
expect(
colorDiff({ r: 255, g: 0, b: 0, a: 0 }, { r: 255, g: 0, b: 0, a: 0 })
).toEqual(0);
expect(
colorDiff({ r: 0, g: 0, b: 0, a: 0 }, { r: 255, g: 255, b: 255, a: 0 })
).toEqual(1);
});
test("different alpha", () => {
expect(
pct(
colorDiff(
{ r: 255, g: 0, b: 0, a: 100 },
{ r: 255, g: 0, b: 0, a: 150 }
)
)
).toEqual(3.8);
expect(
colorDiff({ r: 0, g: 0, b: 0, a: 0 }, { r: 255, g: 255, b: 255, a: 255 })
).toEqual(1);
});
});
describe("scan", () => {
class TestImage {
public bitmap = {
height: 3,
width: 3,
data: Buffer.from([
0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
]),
};
}
const img = new TestImage() as JimpClass;
test("scan", () => {
let count = 0;
scan(img, function (_, __, idx) {
count++;
expect(img.bitmap.data[idx]).toBe(this.bitmap.data[idx]);
});
expect(count).toBe(img.bitmap.width * img.bitmap.height);
});
});
