Fast awake from low power mode

摘要

An electronic device in a low power mode, for example an eBook reader device, may use a fast awake module to quickly update a display. The electronic device may receive an interrupt, begin to awaken, present a cached pre-rendered image on the display, and may resume the low power mode or pre-render additional images to refill the cache before resuming the low power mode.

主权项

1. A method comprising:
receiving a keypad wakeup interrupt at an electronic device; awakening the electronic device from a low power mode at least partly in response to the receiving of the keypad wakeup interrupt; when a pre-rendered image cache of the electronic device does not store a pre-rendered image:
starting a rendering application;synchronizing a presented image on a display with content to be presented;pre-rendering an image of the content to be presented;storing the pre-rendered image in the pre-rendered image cache;placing the electronic device into the low power mode; when the pre-rendered image cache of the electronic device does store a pre-rendered image:
presenting the stored pre-rendered image on the display; when the pre-rendered image cache is empty after presentation of the stored pre-rendered image:
starting the rendering application;synchronizing the presented image on the display with content to be presented;pre-rendering an image of the content to be presented;storing the pre-rendered image in the pre-rendered image cache;placing the electronic device into the low power mode; and when the pre-rendered image cache is not empty after presentation of the stored pre-rendered image:
placing the electronic device into the low power mode.