Variable Font Bounding Box Interpolation
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Solution Overview
Problem
Existing systems for generating font bounding boxes for variable fonts are inefficient and inaccurate, particularly due to the need to iteratively process all glyphs for each instance, leading to significant processing loads and potential errors in calculating bounding boxes for custom instances.
Innovation Solution
A custom font bounding box system that utilizes glyph sets from predefined instances of variable fonts to generate custom font bounding boxes by determining the closest predefined instances to a custom instance, using these instances to calculate the bounding boxes efficiently and accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing systems iteratively process all glyphs for each variable font instance to generate font bounding boxes, then they can handle custom instances, but processing load and time increase significantly
Solution Approach 1:
The system pre-calculates and stores bounding box information for a set of representative variable font instances during font compilation. This preliminary action allows custom instances to be handled by interpolating from pre-computed data rather than processing all glyphs at runtime, dramatically reducing processing time while maintaining adaptability to custom instances
Solution Approach 2:
The system creates copies of bounding box data from predefined variable font instances and uses interpolation to generate bounding boxes for custom instances. Instead of processing all glyphs for each custom instance, the system copies and adjusts bounding box information from similar predefined instances, maintaining versatility while improving productivity
2Ease of operation
If normalization mechanism is used to generate font bounding boxes for variable font instances, then processing is simplified, but accuracy decreases for custom instances
Solution Approach 1:
The system changes the approach from using fixed normalization parameters to using interpolated parameters derived from multiple predefined instances. By varying the parameters based on the specific custom instance being processed and blending results from multiple source instances, the system maintains ease of operation while significantly improving bounding box accuracy for custom instances
3Measurement precision
If all possible values for design axes are processed to ensure accuracy, then bounding box precision improves, but processing time increases
Solution Approach 1:
The system processes a partial set of representative variable font instances (enough to cover the design space) rather than all possible values. This partial action provides sufficient precision for custom instances through interpolation while avoiding the excessive processing time that would result from evaluating every possible design axis value
Data Source
AI summary
This disclosure describes methods, non-transitory computer readable storage media, and systems that utilize glyph sets from predefined instances of variable fonts to customize font bounding boxes for custom instances of the variable fonts. The disclosed system customizes digital text including a variable font via one or more adjustable design axes. In response to a request to set a custom value of a design axis, the disclosed system determines a first and second predefined instances of the digital text. For example, the disclosed system determines a Euclidean distance between the custom value and corresponding values for the predefined instances. The disclosed systems determine sets of glyphs that contribute to the font bounding boxes of the first predefined instance and the second predefined instance. The disclosed systems generate a custom font bounding box for the digital text at the custom value of the design axis based on the glyph sets.