944872 - Firefox on Android 4.4 doesn't correctly show some utf-8/emoji

Status: RESOLVED INCOMPLETE

(Firefox for Android Graveyard :: General, defect)

Description

[paulv]

User Agent: Mozilla/5.0 (X11; Linux i686; rv:25.0) Gecko/20100101 Firefox/25.0 (Beta/Release)
Build ID: 20131112160018

Steps to reproduce:

I browsed to http://www.canonical.org/~paulv/emoji.html.


Actual results:

On Android 4.4 (Nexus 7 2013), using Firefox 25.0.1 and Firefox Beta, downloaded from the Google Play Store, the line with the utf-8/emoji is rendered incorrectly.

On Android 4.3 (Nexus 7 2013), using Firefox 25.0.1, the line with the utf-8/emoji was rendered correctly (I upgraded the device, so I can't test it in 4.3).

On Android 4.1.2 (Samsung Galaxy S3), using Firefox 25.0.1, the line with the utf-8/emoji is rendered correctly.

The bug is a bit odd. It seems to delete the previous characters on the line. View source on the page to see what the line should look like.


Expected results:

The page should render correctly.

Comment 1

[Aaron Train [:aaronmt]]

I see this on my Nexus 5 as well (tested with Nightly 28.0).

Comment 2

[Aaron Train [:aaronmt]]

Simple test-case: data:text/plain;charset=UTF8,%F0%9F%90%B1

Comment 3

[Jonathan Kew [:jfkthame]]

Could you attach a screenshot showing the incorrect rendering, please?

Comment 4

[paulv]

Attachment: Screenshot from Firefox 25.0.1 on Android 4.4

Comment 5

[Kevin Brosnan [Ex-Mozilla]]

I have the Nexus 7 2012 Android 4.4 "KitKat" /system/fonts/ folder at http://people.mozilla.org/~kbrosnan/tmp/944872/n7-2012-fonts.zip

Comment 6

[Alex]

Attachment: Chrome on Android 4.4

Chrome doesn't get this test case right either, but it does manage to show the text that Firefox doesn't (But fails at the Emoji as well)

Comment 7

[Jonathan Kew [:jfkthame]]

Hmm - looks like the 4.4 /system/fonts/ folder (from comment 5) includes Google's "Noto Color Emoji" font, which uses their new (and not standardized) format to embed color bitmaps. I suspect that's probably triggering the problem, although I'm not sure why - even if we can't render that font (which requires a pretty recent version of FreeType, at least), it shouldn't affect the rest of the text.

Comment 8

[Jonathan Kew [:jfkthame]]

Support for the color emoji font is bug 974575 and bug 969814.

I believe the other missing (non-emoji) text was bug 973380, which should now be fixed on trunk.

Comment 9

[BMO Automation]

We have completed our launch of our new Firefox on Android. The development of the new versions use GitHub for issue tracking. If the bug report still reproduces in a current version of [Firefox on Android nightly](https://play.google.com/store/apps/details?id=org.mozilla.fenix) an issue can be reported at the [Fenix GitHub project](https://github.com/mozilla-mobile/fenix/). If you want to discuss your report please use [Mozilla's chat](https://wiki.mozilla.org/Matrix#Connect_to_Matrix) server https://chat.mozilla.org and join the [#fenix](https://chat.mozilla.org/#/room/#fenix:mozilla.org) channel.