Microsoft Technology Licensing, LLC

Fei Xiong

Xiao Tu

Patrick Jee-An Poon

Jianfeng Lin

Krishnan Menon

David Walker Duhon

Connor Lawrence Weins

Sung Hong

Systems and methods are provided for improving the latency for display of ink during user creation of ink content with an object, such as a stylus, mouse, finger (or other touch input), or other drawing device. In order to reduce or minimize the time for display of ink content created by a user, aspects of the technology described herein generate predictive wet ink that can be displayed with actual wet ink. The predictive wet ink is calculated by extending an active ink segment a predictive distance. The predictive distance is intended to be a distance between a termination ink point for an active wet ink segment and a tip of the writing object. In one aspect, the predictive distance is calculated by determining the current latency period on a touch device and the velocity of the writing object.

Wet ink predictor

A platform-level container configured to hold natively-supported ink stroke data structures is maintained. The platform-level container is accessible to a plurality of different applications. An ink stroke visual corresponding to each ink stroke data structure held by the platform-level container is rendered via a display. An ink stroke change event corresponding to an ink stroke data structure held by the platform-level container is recognized. The ink stroke data structure is changed to an updated ink stroke data structure in accordance with the ink stroke change event. An ink stroke visual corresponding to the updated ink stroke data structure is rendered via the display without re-rendering ink stroke visuals corresponding to unchanged ink stroke data structures.

Ink stroke editing and manipulation

Systems and methods are provided for improving the latency for display of ink during user creation of ink content with a stylus, mouse, finger (or other touch input), or other drawing device for tracing a desired location for ink content in a display area. In order to reduce or minimize the time for display of ink content created by a user using a stylus/mouse/touch input/other device, a separate ink rendering process thread can be used that operates within the operating system and in parallel to other application threads. When it is desired to create ink content within an application, user interactions corresponding to creation of ink content can be handled by the separate ink rendering process thread. This can avoid potential delays in displaying ink content due to an application handling other events in a process flow.

Low latency ink rendering pipeline

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Redmond, WA, United States of America

Fei Xiong