resvg is an SVG rendering library.
resvg can be used as:
The core idea is to make a fast, small, portable, multiple-backend SVG library designed for edge-cases.
Another major difference from other SVG rendering libraries is that resvg does a lot of preprocessing before rendering. It converts an input SVG into a simplified one called Micro SVG and only then it begins rendering. So it's very easy to implement a new rendering backend. And you can also access Micro SVG as XML directly via usvg tool.
resvg is aiming to support only the static
SVG subset; e.g. no
cursor elements, no events and no animations.
A list of unsupported features can be found here.
Results of the static subset of the SVG test suite:
Results of the resvg test suite:
You can find a complete table of supported features here. It also includes alternative libraries.
Comparing performance between different SVG rendering libraries is like comparing apples and oranges. Everyone has a very different set of supported features, implementation languages, build flags, etc. You should do the benchmarks by yourself, on your images.
Because of that, we are only comparing the relative performance between
so you can choose the one by yourself. Also, it helps with regression testing.
But you should note, that results still may vary depending on OS, hardware,
and backend's underlying library version.
- elementary icons are very simple, and we are basically testing primitives rendering.
- All icons were rendered with 4x zoom.
- Qt has a slow path stroking/filling algorithm, but a fast layer compositing. So on complex files it's pretty fast, as you can see below.
- Oxygen icons are absurdly complex. Many files are more than 200KiB and total size is 1.2GiB! Most of the files include complex features like clipping, masking, patterns, blur and multiple layers.
- All images were converted from
The tests above we run on a single thread on Gentoo Linux with AMD 3700X and inside
You can find the script here.
Used libraries: cairo 1.16.0, Qt 5.13.2, raqote 0.6.1, Skia m76
For more specific details checkout benches/README.md
resvg– rendering backends implementation
usvg– an SVG simplification tool
resvg-qt– minimal bindings to Qt
resvg-skia– minimal bindings to Skia
svgfilters– a collection of SVG filters
All other dependencies aren't written by me for this project.
benches- basic benchmarks for rendering operations
bindings– minimal bindings to Qt and Skia used by resvg
capi– C interface for resvg
docs– basic documentation
examples– usage examples for resvg as a library
src– source code
svgfilters- SVG filters implementation
testing-tools– scripts used for testing
tools– useful tools
usvg– an SVG simplification library used by resvg
- The library must not panic. Any panic should be considered a critical bug and should be reported. There are only a few methods that can produce a panic.
- The core library structure (see above) does not use any
unsafe, but since all backends are implemented via FFI, we are stuck with
usvguses unsafe for fonts memory mapping.
resvg is licensed under the MPLv2.0.