Type3 font is not rendered

[JanSlabon]

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

Configuration:

• Web browser and its version: Firefox (83.0)
• Operating system and its version: Win 10 Pro
• PDF.js version: 2.7.345

Steps to reproduce the problem:

1. Open attached PDF
2. You see a white page

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)
Nothing is rendered but the text layer (selected for demonstration only):

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

[Snuffleupagus]

The Type3-glyphs look slightly "weird" as far as I can tell, see one example below (using http://brendandahl.github.io/pdf.js.utils/browser/ to extract the data), since each one sets the fill-color to white initially (the 1 1 1 rg operator) which is then applied at the end (the f operator).
Provided that I'm not misunderstanding the operatorLists of the glyphs, we thus end up painting them completely white. What I don't see, off the top of my head, is an easy way to fix this since I can't imagine that just ignoring a white-fill operator for Type3-glyphs is correct in general.

iSQP0031 (stream) [id: 27, gen: 0]

    Length = 143
    Filter = /FlateDecode
    <view contents> download

    546 0 110 0 465 730 d1
    0 0 0 RG
    1 1 1 rg
    1 w
    [] 0 d
    465 0 m
    110 0 l
    110 74 l
    242 74 l
    242 562 l
    110 562 l
    110 628 l
    159.87 628 196.62 635.1 220.25 649.32 c
    243.88 663.54 257.17 690.43 260.1 730 c
    336 730 l
    336 74 l
    465 74 l
    h
    f

[JanSlabon]

It become more hard to decide who's wrong when the Type3 example in PDF 2.0 explicitly uses colors in the glyph description:

[...]

[janpe2]

The spec says:
A glyph description that begins with the d1 operator should not execute any operators that set the colour (or other colour-related parameters) in the graphics state; any use of such operators shall
be ignored.

[JanSlabon]

@janpe2 you are right! I didn't noticed that when I skim through the specs.

So then it shouldn't be hard to be fixed. For reference this information can be found in "Table 113 – Type 3 font operators" in PDF 32000-1:2008.

[janpe2]

The forbidden operators are listed at the end of chapter "8.6.8 Colour Operators".

[timvandermeij]

Fixed by the PR above.