All text missing from node.js rasterization

Attach (recommended) or Link to PDF file here: 1120.pdf

Configuration:

• Operating system and its version: ubuntu 18, node v10.13.0
• PDF.js version: HEAD, e9661edda74963dbbba411529fe48f8e8cd01c5c
• Is a browser extension: no

Steps to reproduce the problem:

1. Clean build, mv build/dist node_modules/pdfjs-dist
2. Move the sample 1120.pdf to compressed.tracemonkey-pldi-09.pdf
3. cd examples/node/pdf2png/; node pdf2png.js

What is the expected behavior? An accurate rasterization of the first page of the source document, i.e.

What went wrong? None of the text in the document is rendered:

stderr contains a bunch of warnings like:

Warning: getPathGenerator - ignoring character: "Error: Requesting object that isn't resolved yet Helvetica_path_$.".

Note that the document contains a single embedded font, and it’s not Helvetica, so the message doesn’t really make sense to me.

Are there things that need to be done in a node context to ensure reliably correct rasterization that aren’t included in the example code?

[cemerick]

If I add disableFontFace:false to the .getDocument call, the rasterization output is as expected.

It seems that disableFontFace:true is the default on node, perhaps given the workaround advice provided in e.g. #7929 and elsewhere?

It seems like that “compatibility” setting is counterproductive in this case? It seems at least one other person determined this, https://github.com/mozilla/pdf.js/issues/4244#issuecomment-463865708

[Snuffleupagus]

Adding to https://github.com/mozilla/pdf.js/issues/10623#issuecomment-470199768, I could possibly provide a basic patch which allows loading of external font files[1] such that they are available to the font code on the worker-thread.

However, please note I’d only consider doing so in return for reasonable (monetary) compensation.

For anyone using PDF.js in e.g. a commercial setting, and thus willing to pay for a patch, please feel free to contact me directly to discuss this further (email address is in my GitHub profile).

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[1] Obviously I wouldn’t be able, for e.g. copyright reasons, to provide the actual font files themselves; however I’ve used these ones when taking the screen-shot in https://github.com/mozilla/pdf.js/issues/10623#issuecomment-470154820.