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platform_bootable_recovery/tools/recovery_l10n/README.md
Tianjie Xu 0f7031e295 Restore the max width for recovery background texts 
Restore the max width to 900px for xxhdpi and 1200px for xxxhdpi

Bug: 34541299
Test: Checked width and images passed recovery_manual_test
Change-Id: If0fd51f93cfb3f965d4e9e69be5626eba89eb857
2017-01-22 18:46:04 -08:00

1.5 KiB
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Steps to regenerate background text images under res-*dpi/images/

  1. Build the recovery_l10n app:

    cd bootable/recovery && mma -j32

  2. Install the app on the device (or emulator) with the intended dpi.

    • For example, we can use Nexus 5 to generate the text images under res-xxhdpi.
    • We can set up the maximum width of the final png image in res/layout/main.xml Currently, the image width is 1200px for xxxhdpi, 900px for xxhdpi and 480px for xhdpi/hdpi/mdpi.
    • When using the emulator, make sure the NDK version matches the current repository. Otherwise, the app may not work properly.

    adb install $PATH_TO_APP

  3. Run the app, select the string to translate and press the 'go' button.

  4. After the app goes through the strings for all locales, pull the output png file from the device.

    adb root && adb pull /data/data/com.android.recovery_l10n/files/text-out.png

  5. Compress the output file put it under the corresponding directory.

    • "pngcrush -c 0 ..." converts "text-out.png" into a 1-channel image, which is accepted by Recovery. This also compresses the image file by ~60%.
    • zopflipng could further compress the png files by ~10%, more details in https://github.com/google/zopfli/blob/master/README.zopflipng
    • If you're using other png compression tools, make sure the final text image works by running graphic tests under the recovery mode.

    pngcrush -c 0 text-out.png $OUTPUT_PNG