Virtual View Tree Rendering Optimization
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Solution Overview
Problem
Existing computer graphics rendering methods face inefficiencies in memory usage and performance due to the need for extensive data duplication and storage in both immediate and retained modes of operation, where either high regeneration costs occur in immediate mode or significant memory requirements exist in retained mode.
Innovation Solution
A virtual view tree is maintained by the application, where nodes are created and cached dynamically as needed, allowing only the necessary data to be stored and accessed on demand, reducing memory usage and optimizing rendering by allowing regeneration of nodes when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a view tree is maintained by a graphics library in retained mode, then rendering can be optimized and the document can be completely traversed, but memory requirements become significant due to data duplication
Solution Approach 1:
The patent extracts only the necessary portions of the view tree into a cache rather than maintaining the entire tree in memory. The graphics library requests specific nodes from the application, and only those nodes are cached and retained in memory, eliminating the need to hold the complete view tree structure.
Solution Approach 2:
The view tree is segmented into individual nodes that can be independently requested, cached, and managed. Instead of treating the entire document structure as a single retained data structure, the system breaks it down into discrete nodes that are loaded on-demand based on rendering requirements.
2Quantity of substance
If an application maintains its own data structures in immediate mode, then memory requirements are low, but rendering speed suffers due to repeated regeneration of drawing content
Solution Approach 1:
Nodes are cached in advance before they are needed for rendering. When a node is requested by the graphics library, it is generated and stored in the cache, so that subsequent requests for the same node can be served from cache without regeneration, improving rendering speed while maintaining low memory usage.
Solution Approach 2:
Instead of maintaining the full view tree, the system creates copies of only the specific nodes that are currently needed for rendering. These node copies are stored in a cache structure that the graphics library can traverse efficiently, avoiding the need to regenerate nodes repeatedly.
3Stability of the object's composition
If the entire view tree is stored persistently, then the document structure is fully maintained, but resources are depleted and rendering is slowed
Solution Approach 1:
The system extracts only the currently needed portions of the document structure into the cache, rather than maintaining the entire persistent view tree in memory. The graphics library can still traverse and render the document structure efficiently by requesting nodes as needed from the application.
Solution Approach 2:
The cache is dynamic rather than static - nodes are added to the cache when requested and can be removed when no longer needed. This dynamic management allows the system to adapt memory usage to current rendering requirements while maintaining the stability of the underlying document structure.
Data Source
AI summary
A virtual view tree for representing a document. A virtual view tree is maintained by an application, rather than a renderer (e.g., graphics rendering library) called upon by the application to display the document. The view tree is virtual in that nodes need not be created until they are to be displayed. When instructed to display the document, the renderer requests nodes and their attributes. The nodes may be cached while the renderer works on their content, but may be removed from memory anytime thereafter. Only a subset of the virtual view tree's nodes is stored at one time, and only in non-persistent storage. The application includes various APIs for navigating a virtual view tree, describing its attributes and caching its nodes. The APIs may be directly accessible to the renderer or may be invoked by subsystems of the application (e.g., client, tree navigation and caching subsystems).