linebender/resvg
Resvg
Resvg is a high-compliance SVG rendering library and parsing engine designed to convert scalable vector graphics into raster images. It functions as an SVG to raster converter that resolves XML trees and manages the transformation of vector data into bitmap formats.
The project ensures cross-platform visual consistency by producing identical pixel-perfect output regardless of the operating system or CPU architecture. It distinguishes itself through a text layout engine that handles complex typography, including bidirectional reordering, vertical writing modes, and color emoji fonts.
The library covers a broad capability surface including the application of external CSS stylesheets, the rendering of visual filters such as Gaussian blur, and programmable resolution for fonts and images. It also incorporates security measures to protect against resource exhaustion attacks by enforcing limits on document complexity and nesting depth.
Features
- Cross-Platform Renderers - Ensures identical pixel-perfect raster output across different operating systems and CPU architectures.
- Internal Tree Normalizations - Resolves complex XML into a standardized internal tree where attributes and references are pre-processed.
- SVG Specification Parsers - Provides a high-compliance parsing engine that converts SVG XML into internal drawing primitives.
- SVG Libraries - Functions as a high-compliance library for converting SVG vector graphics into consistent raster images.
- Complex Typography Rendering - Supports complex typography including bidirectional reordering, vertical writing modes, and color emoji fonts.
- Deterministic Raster Rendering - Produces identical pixel-perfect images regardless of the operating system or CPU architecture used.
- Advanced Typography Rendering - Handles complex typographic layout including bidirectional reordering, vertical writing modes, and text-on-path.
- Canvas Text Layout Engines - Integrates a layout engine that calculates glyph positions for bidirectional text and vertical writing modes.
- Vector Rasterizers - Converts mathematical vector definitions of SVG files into pixel-based raster images.
- CSS-Based Styling - Implements a high-compliance CSS cascade to apply styles to SVG elements based on specificity.
- Bitmap Rasterizers - Transforms scalable vector graphics into bitmap formats with support for advanced CSS and visual filters.
- Programmable Resolvers - Enables custom control over font matching and fallback behavior through a programmable resolver.
- Two-Pass Parsing - Utilizes a two-pass parsing strategy to resolve XML attributes and references into a normalized internal tree.
- External Asset Resolvers - Resvg handles external image links via a programmable resolver to control how assets are loaded.
- SVG Filter Effects - Renders complex visual effects such as Gaussian blur and drop shadows using standard SVG filter functions.
- Unicode Emoji Fonts - Supports the rendering of color fonts and emojis via specialized font tables.
- Parsing Depth Limits - Enforces strict nesting depth and element count limits during parsing to prevent resource exhaustion attacks.
- Document Security Limits - Protects against denial-of-service attacks by capping document complexity and nesting depth of SVG files.
- Fixed-Point Arithmetic Engines - Implements a rendering engine using fixed-point arithmetic to ensure deterministic, pixel-perfect output across different CPU architectures.
- SVG Attribute Styling - Allows overriding default visual appearances of vector graphics via external CSS stylesheets and custom font resolvers.
- Custom Stylesheet Injections - Supports the injection of external CSS stylesheets to override the default visual styles during rendering.
- Programmable Asset Resolvers - Provides a programmable interface for custom resolution of external fonts and images.
- Graphics & Design - SVG rendering library.
- Graphics Rendering - Library for SVG rendering.
Star history
How this analysis was created: This summary and feature list were written by an AI model that read the project's README and public documentation pages. Each feature links to the documentation it came from; stars, license and language come straight from the GitHub API. The model does not read the source code, and the analysis is refreshed when the project is re-analysed. Learn more on our About page.
