opentypejs/opentype.js
Opentype.js
opentype.js 是一个 JavaScript 库，用于在浏览器和服务器环境中读取、写入及操作 OpenType、TrueType 和 WOFF 字体文件。它既是字体解析器也是生成器，能够提取字形数据和元数据，或通过编程定义字形路径和元数据来创建新的字体文件。
该项目提供了专门的工具来修改字体变体表以控制可变字体属性，并通过 COLR 和 CPAL 表处理颜色层和调色板。它还包含一个贝塞尔路径生成器，可将字体字形和文本字符串转换为用于 SVG 和 Canvas 渲染的路径。
该库涵盖了广泛的排版操作，包括计算字体指标（如字宽和边界框）、将字形转换为 SVG 路径数据，以及将文本直接渲染到 2D 绘图上下文中。它还支持修改原始字形形状，并将字体对象序列化回二进制格式以进行文件导出。
Features
- Font Binary Parsing - Extracts letterforms and glyph data from OpenType and TrueType fonts for use in browser and server environments.
- OpenType Font Parsers - Reads and extracts glyph data, layout tables, and metadata from OpenType and TrueType font files.
- Glyph Index Mappings - Organizes font data into logical tables for efficient character-to-glyph index mapping.
- Binary Buffer Parsing - Parses raw binary buffers from font files into structured JavaScript objects based on OpenType specifications.
- Font Binary Encoders - Encodes font objects into contiguous byte streams for export as standard binary font files.
- Font Metadata Inspection - Interprets binary tables to reveal the underlying geometric and structural data of font characters.
- Bezier Curve Rendering - Converts font glyph coordinates into Bezier curves for visualization on 2D canvases or SVG surfaces.
- Font Format Exporters - Saves font objects into binary formats like WOFF and OpenType for cross-platform compatibility.
- OpenType Font Toolkits - Provides a comprehensive JavaScript library for reading, writing, and manipulating OpenType, TrueType, and WOFF font files.
- Bezier Path Generators - Generates Bezier path representations of text strings, incorporating kerning and ligatures.
- Unicode Glyph Mapping - Resolves Unicode characters to specific glyph indices by parsing the font's character map table.
- Automated Font Generators - Writes glyph and layout information to generate new OpenType font files.
- Programmatic Font Generators - Designs and exports new OpenType font files by defining Bezier paths and metadata programmatically.
- Font Binary Generation - Creates new OpenType font files by defining glyph paths and font metadata programmatically.
- Font Metric Mappers - Calculates character advance widths and bounding boxes for precise text layout and positioning.
- Glyph Alignment Metrics - Calculates bounding boxes and spacing for individual characters to ensure consistent visual alignment.
- Variable Font Axis Manipulation - Programmatically adjusts design-space axes in variable fonts to control typographic properties.
- Text Rendering - Renders strings of text directly onto a 2D canvas drawing context.
- Canvas Vector Rendering - Translates vectorized glyph paths into drawing commands for the browser's 2D canvas API.
- Color Layer Processing - Manipulates color palettes and layers within fonts using COLR and CPAL tables.
- Variable Font Table Management - Provides utilities for modifying font variation tables to control variable font properties.
- SVG Path Serializers - Transforms font paths into SVG path data strings for use in web graphics.
- Glyph-to-Vector Rendering - Converts font characters into vector shapes for precise rendering in web graphics.
- Glyph Modifications - Implements programmatic manipulation of raw glyph points and paths to alter character appearances.
- Color Glyph Table Managers - Manipulates palettes and color layers for fonts using COLR and CPAL tables.
