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什麼是 Boot to Gecko(B2G)
● Mozilla's open source mobile operating system based on Linux and Mozilla's Gecko technology.
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概念
● The idea is essentially to have all user-accessible software running on the phone be a Web app that uses advanced HTML5 techniques and device APIs to access the phone's hardware directly via JavaScript.
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系統介紹
● Gaia● Gecko● Gonk
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Gaia
● The user interface of b2g. Everything drawn to screen after b2g starts up is some part of Gaia. Gaia implements a lock screen, home screen, telephone dialer, text-messaging application, camera app, ... and many more.
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Gaia
● Gaia is written entirely in HTML, CSS, and JavaScript. Its only interface to the underlying operating system is through Open Web APIs, which are implemented by Gecko. Gaia works well when run on top of b2g; however, since it only uses standard web APIs, it works on other OSes and in other web browsers.
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Gaia
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可能會有人想問
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可能會有人想問為什麼只有一張圖？
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因為 ...改版了
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Gecko
● The "application runtime" of b2g. At a high level, Gecko implements the open standards for HTML, CSS, and JS and makes those interfaces run well on all the OSes that Gecko supports.
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Gonk
● The lower-level "operating system" of b2g. Gonk consists of a linux kernel and userspace hardware abstraction layer (HAL).
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Gonk
Gaia
Gecko
Web app
…......
b2g
kernel
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比較
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Boot
Boot Loader Kernel init
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Userspace process architecture
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Gecko: Processing input events
● input-device drivers● Gonk app shell● EventHub● DOM
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Gecko: Graphics
● At the very lowest level, Gecko uses OpenGL ES 2.0 to draw to a glcontext that wraps the hardware framebuffers.
● Gecko draws directly to VRAM.
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Web app
● Web apps are apps built using standard Web technologies.
● manifest.json
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manifest.json
https://developer.mozilla.org/en/Apps/Manifest
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Intsall app
● navigator.mozApps.install(manifestURL)
or
● Put app in gaia/apps/● make install-gaia
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Marketplace
https://marketplace.mozilla.org/
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Demo
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Run B2G
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Firefox Nightly + gaia
http://alivedise.github.com/blog/2012/05/05/gaia/
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Emulator
● QEMU Emulator
http://www.figuiere.net/hub/blog/?2012/03/13/818-building-b2g-on-fedora-field-notes
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Device
● Samsung Galaxy S2● Samsung Nexus S
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Reference
● https://developer.mozilla.org/en/Mozilla/Boot_to_Gecko
● https://wiki.mozilla.org/B2G/Architecture
● http://pydoing.blogspot.com/2010/12/javascript-example.html
● http://mozlinks-zh.blogspot.com/2012/05/gaia-mozilla-b2g.html
● http://www.slideshare.net/robhawkes/mdn-hackday-london-boot-to-gecko-the-future-of-mobile
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Thank you
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