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SnapOtterandGitHub
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Target-size compression had only a coarse DPI lever, so it undershot badly (a 350KB target could land at 216KB) and silently missed unreachable targets. Adds JPEG quality as a second lever (forced re-encode so it bites on JPEG scans), folds both into one monotonic quality axis that target-size binary-searches, reports targetMet honestly in the panel across 21 locales, and flips the tool to async for the extra passes. Quality-mode output sizes shift intentionally (slider now drives JPEG quality at full resolution in its top half).
31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { paramsForQuality } from "../../../apps/api/src/routes/tools/compress-pdf.js";
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describe("paramsForQuality", () => {
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it("endpoints: q=100 preserves resolution at best quality; q=1 is smallest", () => {
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const hi = paramsForQuality(100);
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expect(hi.dpi).toBe(300);
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expect(hi.qFactor).toBeCloseTo(0.1, 2);
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const lo = paramsForQuality(1);
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expect(lo.dpi).toBeLessThanOrEqual(30);
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expect(lo.qFactor).toBeGreaterThan(2.0);
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});
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it("is monotonic in size: dpi non-decreasing and qFactor non-increasing as q rises", () => {
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let prevDpi = 0;
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let prevQf = Number.POSITIVE_INFINITY;
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for (let q = 1; q <= 100; q++) {
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const { dpi, qFactor } = paramsForQuality(q);
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expect(dpi).toBeGreaterThanOrEqual(prevDpi);
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expect(qFactor).toBeLessThanOrEqual(prevQf + 1e-9);
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prevDpi = dpi;
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prevQf = qFactor;
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}
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});
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it("clamps out-of-range input", () => {
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expect(paramsForQuality(0)).toEqual(paramsForQuality(1));
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expect(paramsForQuality(200)).toEqual(paramsForQuality(100));
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});
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});
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