Caching Sub-pixel Coverage Values for Text Rendering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rendering technologies for text on computing devices are slow and resource-intensive, particularly when handling animations and interactive user interfaces, due to the complexity of processing steps required for text rendering, including calculation of coverage values, gamma correction, and combination of color information, which can lead to choppy or slow interface responses.
Innovation Solution
The proposed solution involves caching sub-pixel coverage values using sub-pixel anti-aliasing techniques, allowing for linear combination with overlapping display elements' color information, and configuring graphics processing units (GPUs) to perform these operations efficiently, thereby eliminating the need for gamma correction and streamlining the rendering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional text rendering with anti-aliasing is used, then text visual quality is improved, but rendering speed and resource efficiency deteriorate
Solution Approach 1:
The patent pre-calculates and stores coverage values for text glyphs before actual rendering occurs. When text needs to be displayed, the pre-computed coverage values are retrieved and applied directly, eliminating the need for real-time anti-aliasing calculations. This preliminary preparation of rendering data significantly speeds up the rendering process while maintaining visual quality.
Solution Approach 2:
The patent separates coverage value calculation from color information processing. By dividing the rendering process into independent stages where coverage values are computed once and reused, the system avoids redundant calculations. The coverage map is segmented from the actual text rendering operation, allowing efficient reuse across different rendering contexts.
2Manufacturing precision
If gamma correction and color combination calculations are performed for each rendering operation, then color accuracy is improved, but processing complexity and resource usage increase
Solution Approach 1:
The patent performs gamma correction and color space transformations in advance during the coverage value calculation phase. The corrected coverage values are stored with the pre-computed data, so that during actual rendering, only simple composition operations are needed. This preliminary processing of color-critical operations reduces runtime complexity while preserving color accuracy.
Solution Approach 2:
The patent creates pre-processed copies of text rendering data that include embedded coverage values and color information. These copied and pre-prepared rendering objects can be instantiated and composited efficiently without requiring repeated complex calculations. The system works with copies of rendering data that have already undergone expensive processing operations.
Data Source
AI summary
Techniques for calculating sub-pixel coverage values for text to be displayed, so as to enable caching of the sub-pixel coverage values. The sub-pixel coverage values may enable a linear combination of color information for the text with color information for one or more other, overlapping display elements for calculating composite color values to be used in controlling a display. Such composite color values to be used in controlling sub-pixels of a display may be calculated, in some embodiments, without performing a gamma correction process. Also described are techniques for retrieving cached sub-pixel coverage values and combining the values with color information for text and for other, overlapping display elements to calculate composite color values for sub-pixels of a display. At least one graphics processing unit (GPU) may be configured to perform operations using the sub-pixel coverage information and to calculate the composite color values for the sub-pixels.