Basic rework of the crosspoint sd fonts master to support Japanese epubs, with basic tategaki functionality.
Under fairly tight memory constraints so expect some bugginess. Tested on an X3.
Flash crosspoint-jp.bin. Unzip RotatedNotoRegSerif_ascii.zip into a subfolder of .fonts on your SD card.
- Select the font in Settings->Reader->Reader Font Family
- Set Settings->Reader->Reading Orientation to Landscape CCW
- (Optional) Set Settings->Reader->Extra Paragraph Spacing to OFF
- Open your epub