Attach (recommended) or Link to PDF file here:
[shading_pattern.pdf](https://github.com/mozilla/pdf.js/files/1532598/shading_pattern.pdf)

Configuration:
- Web browser and its version: Firefox 57.0
- Operating system and its version: Debian GNU/Linux 9 64-bit
- PDF.js version: tried with Firefox's 1.9.583 and with online viewer 2.0.185
- Is a browser extension: no

Steps to reproduce the problem:
1. Open the attached file with the online viewer https://mozilla.github.io/pdf.js/web/viewer.html

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/11061462/33626267-d9a57dee-d9d8-11e7-8712-cfa17c038259.png)
(Image captured from Adobe Reader CS.) The shading needs to be inside the letters.

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/11061462/33626285-eaabd462-d9d8-11e7-94e2-96480b57750d.png)
The shading seems to be displaced and upside-down, for it does not cover all the characters of the word.

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

if (!this.contentVisible) {
      return;
    }
    const ctx = this.ctx;
    const width = img.width,
      height = img.height;
    const glyph = this.processingType3;
    if (COMPILE_TYPE3_GLYPHS && glyph && glyph.compiled === undefined) {
      if (width <= MAX_SIZE_TO_COMPILE && height <= MAX_SIZE_TO_COMPILE) {
        glyph.compiled = compileType3Glyph({ data: img.data, width, height });
      } else {
        glyph.compiled = null;
      }
    }
    if (glyph?.compiled) {
      glyph.compiled(ctx);
      return;
    }
    const mask = this._createMaskCanvas(img);
    const maskCanvas = mask.canvas;
    ctx.save();
    
    
    ctx.setTransform(1, 0, 0, 1, 0, 0);
    ctx.drawImage(maskCanvas, mask.offsetX, mask.offsetY);
    ctx.restore();
    this.compose();
  }
  paintImageMaskXObjectRepeat(