Fast Line Segment Clipping for Mobile Graphics Rendering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing line clipping methods in computer graphics, such as the Cohen-Sutherland and Liang-Barsky methods, are computationally intensive and time-consuming, particularly in mobile devices where resources are limited.
Innovation Solution
A method and system for fast clipping of line segments using an L-shaped rendering region, where line segments are clipped against an L-shaped region defined by panning increments, reducing the area to be rendered and improving rendering speeds by up to 6 to 8 times compared to traditional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional line clipping methods (Cohen-Sutherland, Liang-Barsky) are used, then line segments can be clipped accurately, but computational resources and time consumption increase significantly
Solution Approach 1:
The patent segments the clipping process into two distinct phases: a fast first clipping phase that processes line segments against simplified clipping planes, and a second clipping phase that processes only remaining segments against the actual display window. This segmentation allows accurate clipping to be applied selectively only where necessary, reducing overall computational time while maintaining precision for segments that require it.
Solution Approach 2:
The patent applies partial clipping action by performing clipping operations only on specific subsets of line segments rather than all segments uniformly. The first clipping phase processes all segments against simplified planes, then only segments that intersect the display window are processed in the second phase. This partial action approach reduces total computational operations while maintaining accuracy for critical segments.
2Manufacturing precision
If traditional line clipping methods are used, then line segments can be clipped accurately, but computational resources increase
Solution Approach 1:
The patent divides the computationally intensive clipping task into two stages with different complexity levels. The first stage uses simplified clipping planes to quickly eliminate obviously invisible segments, while the second stage applies precise clipping only to segments that actually intersect the display window. This segmentation reduces total computational resource consumption while preserving accuracy for segments requiring precise processing.
Solution Approach 2:
The patent implements partial computational action by processing only the necessary subset of line segments through the more expensive second clipping phase. By using the first clipping phase as a filter, the system performs computationally intensive operations only on segments that are likely to be visible, thereby improving productivity while maintaining accuracy where needed.
3Adaptability or versatility
If the entire display area is rendered, then all visible content is displayed, but rendering time and computational resources increase
Solution Approach 1:
The patent extracts and processes only the necessary portion of the display area by first determining which line segments intersect the display window using simplified clipping planes. This extraction allows the system to render only the relevant segments rather than the entire display area, significantly improving rendering speed while maintaining display completeness for the visible region.
Solution Approach 2:
The patent performs preliminary clipping action against simplified clipping planes before final rendering. This preliminary action identifies and isolates the exact portions of line segments that will be visible, allowing the rendering system to focus computational resources only on those segments. The preliminary action ensures display completeness for the visible region while dramatically reducing overall rendering time.
Data Source
AI summary
A method of static graphics rendering in a mobile device. Panning increments are received for panning a previously rendered frame to a panned frame. A rendering region is then determined based on the panning increments. A candidate line segment or polyline is then clipped to create clipped line segments contained within the rendering region. The clipped line segments can then be rendered, and a portion of the previously rendered frame can be copied, to provide the panned frame.