feat(web): zoom du lecteur — contrôles +/−/reset (50–300 %) sur PDF et CBZ

apps/web/src/reader/readerRuntime.test.ts

@@ -1,7 +1,19 @@
 import { describe, expect, it } from "vitest";
 import { epubFileName } from "./EpubReader";
 import { pdfDocumentOptions } from "./pdfDocumentOptions";
-import { clampReaderPage, containPageSize, nextReaderPage, orientedContainPageSize, previousReaderPage, readableViewportSize, readerPositionLabel } from "./readerLayout";
+import {
+  clampReaderPage,
+  clampReaderZoom,
+  containPageSize,
+  nextReaderPage,
+  orientedContainPageSize,
+  previousReaderPage,
+  readableViewportSize,
+  readerPositionLabel,
+  readerZoomFactor,
+  readerZoomLabel,
+  zoomReaderSize
+} from "./readerLayout";
 import { classifyPdfCanvas, pdfCanvasHasVisibleContent, pdfCanvasVisible, pdfRenderScale } from "./pdfRender";
 import { configurePdfWorker, pdfWorkerSrc } from "./pdfWorker";
 import { readerErrorMessage } from "./ReaderError";
@@ -118,6 +130,20 @@ describe("reader runtime helpers", () => {
     expect(orientedContainPageSize({ width: 500, height: 900 }, { width: 1200, height: 900 })).toEqual({ width: 500, height: 375 });
   });
 
+  it("clamps reader zoom to 25 percent steps between 50 and 300", () => {
+    expect(clampReaderZoom(20)).toBe(50);
+    expect(clampReaderZoom(63)).toBe(75);
+    expect(clampReaderZoom(186)).toBe(175);
+    expect(clampReaderZoom(340)).toBe(300);
+    expect(readerZoomLabel(125)).toBe("125 %");
+    expect(readerZoomFactor(175)).toBe(1.75);
+  });
+
+  it("applies reader zoom above the contained media size", () => {
+    expect(zoomReaderSize({ width: 800, height: 600 }, 50)).toEqual({ width: 400, height: 300 });
+    expect(zoomReaderSize({ width: 800, height: 600 }, 200)).toEqual({ width: 1600, height: 1200 });
+  });
+
   it("ignores unusable reader viewport measurements", () => {
     expect(readableViewportSize({ width: 0, height: 833 })).toBeNull();
     expect(readableViewportSize({ width: 1, height: 1 })).toBeNull();