feat: 完成 DOCX 视觉门禁与字体兼容映射

2026-07-31 20:13:19 +08:00
parent 10bc62cee4
commit e5da699ea3
32 changed files with 3015 additions and 17 deletions
@@ -0,0 +1,53 @@
+import { createHash } from "node:crypto";
+
+import { createCanvas } from "@napi-rs/canvas";
+import { describe, expect, it } from "vitest";
+
+import {
+  comparePageRasters,
+  type PdfPageRaster,
+} from "../src/index.js";
+
+function raster(rectangleX: number): PdfPageRaster {
+  const canvas = createCanvas(80, 100);
+  const context = canvas.getContext("2d");
+  context.fillStyle = "#ffffff";
+  context.fillRect(0, 0, 80, 100);
+  context.fillStyle = "#111111";
+  context.fillRect(rectangleX, 20, 20, 40);
+  const png = Uint8Array.from(canvas.toBuffer("image/png"));
+  return {
+    widthPx: 80,
+    heightPx: 100,
+    dpi: 144,
+    sha256: createHash("sha256").update(png).digest("hex"),
+    png,
+  };
+}
+
+describe("PDF 栅格差异", () => {
+  it("相同页面的全部指标为无差异", async () => {
+    const page = raster(10);
+    const result = await comparePageRasters(page, page);
+    expect(result.metrics).toMatchObject({
+      dimensionsMatch: true,
+      meanAbsoluteError: 0,
+      changedPixelRatio: 0,
+      inkIou: 1,
+      edgeIou: 1,
+    });
+    expect(result.artifacts.overlayPng.subarray(0, 8)).toEqual(
+      new Uint8Array([137, 80, 78, 71, 13, 10, 26, 10]),
+    );
+  });
+
+  it("量化位移并生成稳定叠加图与热力图", async () => {
+    const result = await comparePageRasters(raster(10), raster(20));
+    expect(result.metrics.meanAbsoluteError).toBeGreaterThan(10);
+    expect(result.metrics.changedPixelRatio).toBeCloseTo(0.1, 2);
+    expect(result.metrics.inkIou).toBeCloseTo(1 / 3, 2);
+    expect(result.metrics.edgeIou).toBeLessThan(0.4);
+    expect(result.artifacts.overlaySha256).toHaveLength(64);
+    expect(result.artifacts.heatmapSha256).toHaveLength(64);
+  });
+});