Application Window Aware Image Caching in Virtual Desktops
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Solution Overview
Problem
In virtual desktop infrastructure environments, the existing framebuffer encoding systems transmit unnecessary data and consume excessive computing power due to the lack of precise identification of updated image areas, leading to inefficient bandwidth and processing usage.
Innovation Solution
The implementation of a method using hash tables to cache updated image information based on position and size, allowing for efficient storage and transmission of only the necessary image data by creating and utilizing position/size hash tables and image content hash tables on both the server and client sides to track and retrieve cached updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If block/slice aligned encoding is used to detect updated areas, then the encoding process becomes simpler and more standardized, but the transmitted data includes unnecessary areas larger than the actual updated region
Solution Approach 1:
The patent segments the image transmission process into two distinct parts: (1) transmitting only the precise updated area coordinates and dimensions, and (2) transmitting the actual image data for that specific area. This segmentation allows the system to avoid transmitting block-aligned data that includes unnecessary areas, thereby reducing transmitted data volume while maintaining encoding simplicity.
Solution Approach 2:
The patent extracts only the essential information needed for image updating: the precise coordinates and dimensions of the updated area, along with the corresponding image data. By taking out only this necessary information and excluding the surrounding block-aligned areas, the system reduces transmitted data volume while keeping the encoding process straightforward.
2Ease of operation
If the client draws the whole updated area without knowing the exact updated region, then the rendering process becomes simpler, but more computing power is consumed than necessary
Solution Approach 1:
The patent applies preliminary action by having the server calculate and prepare the precise updated area information before transmission. The server determines the exact coordinates and dimensions of the updated region, packages this information along with the image data, and sends it to the client. This preliminary preparation enables the client to efficiently render only the necessary area without consuming excessive computing power, while maintaining rendering simplicity through the provided structured data.
Data Source
AI summary
A method for caching images in a virtual environment uses hash tables to store information about an application or window and to store updated images. Suitable areas of applications or windows are fixed relative to the window for many cases, and also include a relatively small number of possible display statuses. Hash tables are used on an agent side and a client side to track previous image updates. When an updated image is determined to be already stored in a cache, the agent side can transmit a hash identifying the image to the client side, and the client side can update the display with the cached image.