PDF.js displays blurry plots in PDF documents, e.g.

http://arxiv.org/pdf/1202.5344v1.pdf

When viewed in Chrome or Adobe Acrobat all the plots show sharp-edged squares. When viewed in Preview or PDF.js, all the squares show as blurry pixelated blobs.

c3 = tmp;
  }
  if (coords[p1 + 1] > coords[p2 + 1]) {
    tmp = p1;
    p1 = p2;
    p2 = tmp;
    tmp = c1;
    c1 = c2;
    c2 = tmp;
  }
  const x1 = (coords[p1] + context.offsetX) * context.scaleX;
  const y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;
  const x2 = (coords[p2] + context.offsetX) * context.scaleX;
  const y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;
  const x3 = (coords[p3] + context.offsetX) * context.scaleX;
  const y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;
  if (y1 >= y3) {
    return;
  }
  const c1r = colors[c1],
    c1g = colors[c1 + 1],
    c1b = colors[c1 + 2];
  const c2r = colors[c2],
    c2g = colors[c2 + 1],
    c2b = colors[c2 + 2];
  const c3r = colors[c3],
    c3g = colors[c3 + 1],
    c3b = colors[c3 + 2];
  const minY = Math.round(y1),
    maxY = Math.round(y3);