usvg

usvg (micro SVG) is an SVG parser that tries to solve most of SVG complexity.

SVG is notoriously hard to parse. usvg presents a layer between an XML library and a potential SVG rendering library. It will parse an input SVG into a strongly-typed tree structure were all the elements, attributes, references and other SVG features are already resolved and presented in the simplest way possible. So a caller doesn't have to worry about most of the issues related to SVG parsing and can focus just on the rendering part.

Features

• All supported attributes are resolved. No need to worry about inheritable, implicit and default attributes
• CSS will be applied
• Only simple paths
  • Basic shapes (like rect and circle) will be converted into paths
  • Paths contain only absolute MoveTo, LineTo, QuadTo, CurveTo and ClosePath segments. ArcTo, implicit and relative segments will be converted
• use will be resolved and replaced with the reference content
• Nested svg will be resolved
• Invalid, malformed elements will be removed
• Relative length units (mm, em, etc.) will be converted into pixels/points
• External images will be loaded
• Internal, base64 images will be decoded
• All references (like #elem and url(#elem)) will be resolved
• switch will be resolved
• Text elements, which are probably the hardest part of SVG, will be completely resolved. This includes all the attributes resolving, whitespaces preprocessing (xml:space), text chunks and spans resolving
• Markers will be converted into regular elements. No need to place them manually
• All filters are supported. Including filter functions, like filter="contrast(50%)"
• Recursive elements will be detected and removed

Limitations

• Unsupported SVG features will be ignored
• CSS support is minimal
• Only static SVG features, e.g. no a, view, cursor, script, no events and no animations
• Text elements must be converted into paths before writing to SVG

License

usvg is licensed under the MPLv2.0.