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Android匿名共享内存（Ashmem）原理
source link: https://juejin.im/post/59e818bb6fb9a044fd10de38
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阅读之前，不妨先思考一个问题，在Android系统中，APP端View视图的数据是如何传递SurfaceFlinger服务的呢？View绘制的数据最终是按照一帧一帧显示到屏幕的，而每一帧都会占用一定的存储空间，在APP端执行draw的时候，数据很明显是要绘制到
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