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@ixtab, .azw3 (as NiLuJe said) is a dual .mobi with KF8 content included. On KT, Java UI for viewing KF8-formatted content recieves from rendering process BMP image with some metadata (AFAIR, raw text and locations of words on screen for selecting/translating purposes). Rendering process is the webreader (/usr/bin/webreader) process. As KF8 format is a "restricted" HTML5-like format, webreader renders it with the help of WebKit engine and sends rendered image to Java UI.
webreader could be controlled through HTTP requests (it listens on 127.0.0.1:20450, you could find simple debug page by making HTTP request to it and control commands are represented as various URL-paths with query strings). But I believe, it's impossible to intercept rendering process without binary patch to webreader (I could be wrong, though).
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