Implement high contrast mode

[sawanm9000]

Fixes issue #13109.

PDF.js_High_Contrast_Mode.mp4

[sawanm9000]

/botio-linux preview

[brendandahl]

/botio-linux preview

[timvandermeij]

/botio-linux preview

[timvandermeij]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux m4)

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Command cmd_preview from @timvandermeij received. Current queue size: 0

Live output at: http://54.67.70.0:8877/19158c29b064f14/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.67.70.0:8877/19158c29b064f14/output.txt

Total script time: 4.43 mins

Published

• Viewer: http://54.67.70.0:8877/19158c29b064f14/web/viewer.html
• Viewer (legacy): http://54.67.70.0:8877/19158c29b064f14/legacy/web/viewer.html

[brendandahl]

@Snuffleupagus or @timvandermeij is this good to go? I'm hoping to do a mozilla-central update soon.

[Snuffleupagus]

@Snuffleupagus or @timvandermeij is this good to go? I'm hoping to do a mozilla-central update soon.

Please note: I've not really tested the forced-colors part of the patch, and instead focused on ensuring that this doesn't break/regress the "normal" light/dark themes.
The latest preview addresses all my previous comments, and as far as I'm concerned it's good to to go now :-)

@brendandahl As far as I understand, you need to manually set layout.css.forced-colors.enabled = true in about:config in order for this patch to actually have an effect!?
Is that preference going to be toggled on for all Firefox users? If not, can we special-case it (on the mozilla-central side) to apply to code running at resource://pdf.js/web/viewer.html?

[brendandahl]

Is that preference going to be toggled on for all Firefox users? If not, can we special-case it (on the mozilla-central side) to apply to code running at resource://pdf.js/web/viewer.html?

It will soon on by default https://groups.google.com/g/mozilla.dev.platform/c/zwDaj0JMYjs