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Cloud-Computing-14SCS12-VTU-unit-1-->View question

Explain different graphics architecture

Computer graphics and visualization

Asked On2017-06-05 10:19:19 by:Aparna-Dasgupta

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BufferQueue and gralloc. BufferQueue connects something that generates buffers of graphical data (the producer) to something that accepts the data for display or further processing (the consumer). Buffer allocations are performed through the gralloc memory allocator implemented through a vendor-specific HAL interface.

SurfaceFlinger, Hardware Composer, and virtual displays. SurfaceFlinger accepts buffers of data from multiple sources, composites them, and sends them to the display. The Hardware Composer HAL (HWC) determines the most efficient way to composite buffers with the available hardware, and virtual displays make composited output available within the system (recording the screen or sending the screen over a network)

SurfaceView and GLSurfaceView. SurfaceView combines a Surface and a View. SurfaceView's View components are composited by SurfaceFlinger (and not the app), enabling rendering from a separate thread/process and isolation from app UI rendering. GLSurfaceView provides helper classes to manage EGL contexts, inter-thread communication, and interaction with the Activity lifecycle (but is not required to use GLES).

Surface Texture. Surface Texture combines a Surface and GLES texture to create a BufferQueue for which your app is the consumer. When a producer queues a new buffer, it notifies your app, which in turn releases the previously-held buffer, acquires the new buffer from the queue, and makes EGL calls to make the buffer available to GLES as an external texture. Android 7.0 adds support for secure texture video playback enabling GPU post-processing of protected video content.

Texture View. Texture View combines a View with a Surface Texture. Texture View wraps a Surface Texture and takes responsibility for responding to callbacks and acquiring new buffers. When drawing, Texture View uses the contents of the most recently received buffer as its data source, rendering wherever and however the View state indicates it should. View composition is always performed with GLES, meaning updates to contents may cause other View elements to redraw as well

Answerd on:2017-06-27 Answerd By:13priya

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