Note: THIS PROJECT IS ABANDONED Android 8 disallows any app to draw over notification panel or navigation buttons, so Pixel Filter cannot work properly on any newer phone, and nothing can be done about that. Current bugs: * Add Poisson-disc sampling algorithm for lulz. * Option to start on battery percentage. * Fix crashes when watching light level and rotating the phone. * Diagonal lines on some devices - auto-calibrate bitmap offset using a screenshot. * Filter does not cover navigation buttons fully when the keyboard is shown.