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Oculus Go font loading SEGV

See original GitHub issue

Loading <canvas> 2D bootstraps the font system in Skia, which tries to load default system fonts. This fails on Oculus Go, resulting in a segfault:

0x0000007f74d46fb4 in SkFontMgr_Android::SkFontMgr_Android(SkFontMgr_Android_CustomFonts const*) () from /home/a/exokit/android/app/src/main/arm64-v8a/libnative-main.so

We need to make sure the requisite font location is correct/the default font loads successfully to unlock <canvas> 2D on Android.

Issue Analytics

State:
Created 4 years ago
Comments:5 (5 by maintainers)

Top GitHub Comments

1reaction

codingbyclcommented, Apr 20, 2019

found a reference for android env variables:

ANDROID_ASSETS: /system/app
ANDROID_DATA: /data
ANDROID_ROOT: /system
ASEC_MOUNTPOINT: /mnt/asec
BOOTCLASSPATH: /system/framework/core.jar:/system/framework/core-...
EXTERNAL_STORAGE: /storage/sdcard
LOOP_MOUNTPOINT: /mnt/obb
PATH: /sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin

source

1reaction

avaercommented, Apr 20, 2019

Found the culprit. The reason for this error is that we are literally using the magic leap build of skia in the android build, and that build has an OS-specific hack to load fonts.xml from the package instead of the operating system: https://github.com/modulesio/skia/pull/6/files

We’ll need to rebuild skia and somehow make this hack contingent on the ANDROID/LUMIN difference. Ideally it’s detected at runtime so we can continue to share the lib across both platforms…