Signed Distance Field Text Rendering With Effective Line Segment Filtering

The patent segments the curve segments into two categories: effective line segments that intersect the ray from the pixel and ineffective line segments that do not. By traversing only the effective line segments rather than all curve segments, the patent maintains position determination accuracy while significantly improving processing efficiency. This segmentation principle directly resolves the contradiction by filtering out unnecessary computations.

The patent applies partial action by determining interior or exterior position based on only the effective line segments that are necessary for the determination, rather than traversing all curve segments. This partial traversal approach is sufficient to achieve accurate position determination while reducing the computational workload, thus resolving the efficiency-accuracy contradiction.

The patent segments the curve segments into effective and ineffective categories based on whether they intersect the ray from the pixel. By only traversing effective line segments, the patent reduces time consumption while maintaining position information accuracy, directly addressing the time-accuracy contradiction.

The patent performs preliminary action by pre-determining which line segments are effective for a given pixel based on spatial relationships before performing the actual position determination. This preliminary filtering of curve segments reduces the traversal time while ensuring accurate position information is obtained from the relevant segments only.