OpenMiInk/extracted/xiaomi-eink

Xiaomi Mi Reader E Ink compatibility library

The extracted libfakeRKEpdUtils.so exposes an EBC overlay path on every packaged ABI. JniCall_CommitOverlay accepts an Android bitmap, a source rectangle and a destination point. The native implementation locks the bitmap pixels, converts the selected RGBA region to Gray4 and commits that region to the EBC overlay. It does not require an Android View redraw.

Notable uses two paths. Live stylus samples are rasterized into the smallest dirty bitmap and passed directly to sCommitImage once per display frame. On pen-up, one delayed regional capture reconciles the overlay with Qt's retained canvas. Full View.draw() capture is not used while the pen is moving.

The relevant exported native functions are obtain_ebc_target, commit_overlay, convertRGBAtoGray4, set_overlay_commit, set_overlay_bg_control, clearOverlayColor and release_ebc_target.