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.

getPattern() {
    return "hotpink";
  }
}
function getShadingPattern(IR) {
  switch (IR[0]) {
    case "RadialAxial":
      return new RadialAxialShadingPattern(IR);
    case "Mesh":
      return new MeshShadingPattern(IR);
    case "Dummy":
      return new DummyShadingPattern();
  }
  throw new Error(`Unknown IR type: ${IR[0]}`);
}
const PaintType = {
  COLORED: 1,
  UNCOLORED: 2,
};
class TilingPattern {
  
  static get MAX_PATTERN_SIZE() {
    return shadow(this, "MAX_PATTERN_SIZE", 3000);
  }
  constructor(IR, color, ctx, canvasGraphicsFactory, baseTransform) {