Arm Limited

Tom Cooksey

Daren Croxford

Lars Ericsson

David Hennah Mansell

Jørn Nystad

Sean Tristram Ellis

Eivind Liland

Jon Erik Oterhals

A display controller provides an output frame to a display for display by sending respective output surface regions that together form the output frame, each respective region of the output surface being generated from a respective region or regions of one or more input surfaces, to the display. When a new version of an output surface region is generated, the display controller determines whether the output surface region has been unchanged for a period, and if it has, then stores the generated output surface region in a frame buffer. Then, for the subsequent frame, checks are performed to see if the output surface region could have changed. If there is no change the stored version of the output surface region is reused, but if there is a change in the output surface region, the output surface region is regenerated.

Method of and apparatus for displaying an output surface in data processing systems

The technology described herein relates to a method of generating an encoded output video frame for transmission to an electronic display in which an encoded source video frame is decoded to obtain a decoded source video frame, the decoded source video frameis processed to obtain an input video frame, and the input video frameis encoded to obtain an encoded output video frame for transmission. The method comprises comparing a region of an input video framewith a region of a decoded source video framefrom which decoded source video frame the input video frame has been obtained, to determine if the region of the decoded source video frameis similar to the region of the input video frame, and if it is determined that the region of the decoded source video frameis similar to the region of the input video frame, using a region of the encoded source video frame that corresponds to the region of the decoded source video frame as a region of the encoded output video frame for transmission that corresponds to the region of the input video frame.

Method of and apparatus for generating an encoded frame

In a compositing window system, as a respective version of the window for an application is written into a window buffer, a corresponding set of per tile signatures indicative of the content of each respective tile in the window buffer is generated and stored. When an updated version of the window is stored into a window buffer, the set of signature values for the updated version is compared to the set of signature values for the previous version in the window buffer to determine which tiles' content has changed. The set of tiles found to have changed is used to generate a set of regions for a window compositor to write to a window in a display frame buffer to update the window in the display frame buffer to display the new version of the window.

Methods of and apparatus for displaying windows on a display

In a data processing system, an output surface, such as frame to be displayed, is generated as a plurality of respective regions with each respective region of the output surface being generated from a respective region or regions of one or more input surfaces. When a new version of the output surface is to be generated, for each region of the output surface it is determined which region or regions of the input surface or surfaces contribute to the region of the output surfaceand then checked whether the contributing region or regions of the input surface or surfaces have changed since the previous version of the output surface region was generated. If there has been a change in the contributing region or regions of the input surface or surfaces since the previous version of the region in the output surface was generated, the region of the output surface is regenerated

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Cambridge, United Kingdom

Tom Cooksey