I would like to have custom sleep screens (screen savers).
Two ways I would suggest this to be done:
- More development for Kobo, but end-user customizable out of the box: designate a directory that is user-visible when connecting the reader to a computer through USB for sleep screens, to be filled up by PNG files by the user; then display a random one every time the device goes to sleep; if the directory is empty or missing, display the default sleep screen.
- Less development for Kobo, needs the user to load a hack: call (e.g. popen() ) a designated script/binary, expecting a full path to a file on stdout for a PNG to be displayed on screen when the device goes to sleep; if the returned filename cannot be opened or the script is missing or errors out, display the default sleep screen.
In both cases, please allow the PNG to be displayed in its entirety as it is, and do not caption/cover it with "sleeping" or any other text or graphic (or at least provide the option to turn that off). Also, when the pixel dimensions match the screen exactly, please be careful to skip any resizing or other modification operations and put pixel values into the frame buffer exactly as they appear in the file, to keep the high-quality pre-dithering of images where this was applied intact.