Beanz/pdf.js
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Merge pull request #20255 from nicolo-ribaudo/low-res

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Reduce background canvas resolution
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Tim van der Meij 2025-09-11 21:04:27 +02:00 committed by GitHub
commit f049360689
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2 changed files with 16 additions and 6 deletions
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16
test/integration/viewer_spec.mjs
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@ -363,12 +363,16 @@ describe("PDF viewer", () => {
.toBeLessThan(originalCanvasSize * factor ** 2); .toBeLessThan(originalCanvasSize * factor ** 2);
expect(canvasSize) expect(canvasSize)
.withContext(`In ${browserName}, <= MAX_CANVAS_PIXELS`) .withContext(`In ${browserName}, <= MAX_CANVAS_PIXELS / 100`)
.toBeLessThanOrEqual(MAX_CANVAS_PIXELS.get(browserName)); .toBeLessThanOrEqual(MAX_CANVAS_PIXELS.get(browserName) / 100);
expect(canvasSize) expect(canvasSize)
.withContext(`In ${browserName}, > MAX_CANVAS_PIXELS * 0.99`) .withContext(
.toBeGreaterThan(MAX_CANVAS_PIXELS.get(browserName) * 0.99); `In ${browserName}, > MAX_CANVAS_PIXELS / 100 * 0.95`
)
.toBeGreaterThan(
(MAX_CANVAS_PIXELS.get(browserName) / 100) * 0.95
);
}) })
); );
}); });
@ -565,10 +569,10 @@ describe("PDF viewer", () => {
.toBe(2); .toBe(2);
expect(after[0].width) expect(after[0].width)
.withContext(`In ${browserName}`) .withContext(`In ${browserName}`)
.toBe(582 * pixelRatio); .toBe(Math.floor(58.2 * pixelRatio));
expect(after[0].height) expect(after[0].height)
.withContext(`In ${browserName}`) .withContext(`In ${browserName}`)
.toBe(823 * pixelRatio); .toBe(Math.floor(82.3 * pixelRatio));
// The dimensions of the detail canvas are capped to 800x600 but // The dimensions of the detail canvas are capped to 800x600 but
// it depends on the visible area which depends itself of the // it depends on the visible area which depends itself of the

6
web/pdf_page_view.js
View File

@ -798,6 +798,12 @@ class PDFPageView extends BasePDFPageView {
this.maxCanvasDim, this.maxCanvasDim,
this.capCanvasAreaFactor this.capCanvasAreaFactor
); );
if (this.#needsRestrictedScaling && this.enableDetailCanvas) {
// If we are going to have a high-res detail view, further reduce
// the canvas resolution to improve rendering performance.
outputScale.sx /= 10;
outputScale.sy /= 10;
}
} }
} }