62 lines
1.9 KiB
JavaScript
62 lines
1.9 KiB
JavaScript
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import assert from "node:assert/strict";
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import test from "node:test";
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import { findColorBoundaryCrop, mapColorBoundaryCropToLimit } from "../src/ui/pages/CanvasWorkspace/canvas/colorBoundaryCrop.ts";
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function imageFixture(width, height, background, region) {
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const data = new Uint8ClampedArray(width * height * 4);
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for (let y = 0; y < height; y += 1) {
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for (let x = 0; x < width; x += 1) {
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const offset = (y * width + x) * 4;
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const inside = x >= region.left && x < region.right && y >= region.top && y < region.bottom;
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const color = inside ? region.color(x, y) : background;
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data[offset] = color[0];
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data[offset + 1] = color[1];
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data[offset + 2] = color[2];
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data[offset + 3] = color[3] ?? 255;
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}
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}
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return { width, height, data };
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}
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test("finds the connected color-bounded region around a crop click", () => {
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const image = imageFixture(12, 10, [235, 235, 235, 255], {
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left: 3,
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top: 2,
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right: 9,
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bottom: 7,
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color: (x, y) => [64 + x, 72 + y, 80, 255]
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});
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assert.deepEqual(findColorBoundaryCrop(image, { x: 0.5, y: 0.4 }), {
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x: 0.25,
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y: 0.2,
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width: 0.5,
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height: 0.5
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});
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});
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test("uses the full analyzable area when no color boundary encloses the click", () => {
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const image = imageFixture(8, 6, [250, 250, 250, 255], {
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left: 0,
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top: 0,
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right: 0,
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bottom: 0,
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color: () => [0, 0, 0, 255]
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});
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assert.deepEqual(findColorBoundaryCrop(image, { x: 0.5, y: 0.5 }), { x: 0, y: 0, width: 1, height: 1 });
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});
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test("never expands automatic selection beyond the currently visible crop limit", () => {
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const visibleLimit = { x: 0.18, y: 0.12, width: 0.64, height: 0.7 };
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assert.deepEqual(mapColorBoundaryCropToLimit({ x: 0, y: 0, width: 1, height: 1 }, visibleLimit), visibleLimit);
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assert.deepEqual(mapColorBoundaryCropToLimit({ x: 0.25, y: 0.2, width: 0.5, height: 0.4 }, visibleLimit), {
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x: 0.34,
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y: 0.26,
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width: 0.32,
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height: 0.28
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});
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});
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