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Add information about library usage to README [ci skip]

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Joshua Holmer 2016-05-04 09:58:29 -04:00
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@ -61,9 +61,21 @@ it if you have a good reason.
Can save a few kilobytes if you don't need the metadata. "Safe" removes only metadata that
will never affect rendering of the image. "All" removes all metadata that is not critical
to the image. You can also pass a comma-separated list of specific metadata chunks to remove.
`-s` can be used as a shorthand for `--strip safe`.
More advanced options can be found by running `oxipng -h`.
## Library Usage
Although intended to be used as an executable, oxipng can also be used as a library in
other Rust projects. To do so, simply add oxipng as a dependency in your Cargo.toml,
then `extern crate oxipng` in your project. You should then have access to all of the library
functions [documented here](https://shssoichiro.github.io/oxipng/doc/oxipng/). The simplest
method of usage involves creating an
[Options struct](https://shssoichiro.github.io/oxipng/doc/oxipng/struct.Options.html) and
passing it, along with an input filename, into the
[optimize function](https://shssoichiro.github.io/oxipng/doc/oxipng/fn.optimize.html).
## History
Oxipng began as a complete rewrite of the OptiPNG project,