msrd0/rlottie-rs

Rust bindings to rlottie and file conversion library and tools

rlottie-rs

Rust bindings to rlottie and some additional Rust code that interfaces with lottie files.

This repository contains the following crates:

• lottieconv
• rlottie
• rlottie-sys

Deprecated crates:

• lottie2gif
• lottie2webp

rlottie-rs's Issues

Any plans to use gifski instead of gif crates?

Thanks for creating this great project. Is there a plan to replace gif crates with gifski in this project? As far as I know, gifski generates better quality GIF files.

Then I don't know if there is a performance difference between the two.

Is endianness relevant?

I should test the Argb struct and Rgba struct on platform with different endianness from linux to verify it works. For now, we emit a warning from a build script if we detect big endianness.

Examples?

Thanks for sharing your work!

It would be cool if you could include an example on how to use those bindings on the Rust ecosystem -- maybe on Yew or Egui?

An Egui example would be particularly cool, as it may be used to create UIs for Desktop, Web, Android, iOS...

Render to arbitary size surface.

lottie is a vector image format and it can be render to arbitary size surface losslessly. But Animation::render() requires a Size struct which can't be constructed. Only Animation::size() can return a Size struct.

What about add a constructor function to Size struct?

Cannot install binaries on OSX Sonoma

When I run
cargo install lottieconv --features="clap gif"

I'm getting this output/error (gist link because very long).

Support conversion to videos

Support for converting to video will be very useful, as it is smaller than GIF files and can take advantage of GPU hardware acceleration when playing.

There is a SkottieTool in Skottie that generates mp4 files from FFmpeg, I don't know if this is something I could learn from.

If you plan to support video, I can port this library to Node.js via napi-rs.

lottieconv documentation not available

The documentation of the lottieconv release is not available at https://docs.msrd0.de

Use types from rgb crate instead of Rgba and Argb

Those also have repr(C) so should work with no further adjustments necessary

Compatibility with rustup's musl toolchain

Currently, rlottie-sys will always load libclang.so at build time which is unsupported by rustup's static musl toolchain. To fix this, we need to detect a static-only toolchain and disable the runtime feature of clang/bindgen.

However, this is not currently supported by cargo: rust-lang/cargo#1197

See also #17

Windows support

Currently, this project relies on the rlottie C library to be precompiled and pkg-config to be able to find it. This seems to be incompatible with windows.

I see two options going forward:

• Somehow detect precompiled versions of rlottie on Windows. No idea if that's possible, and which tools are necessary to do this.
• Add a vendor feature similar to other -sys crates in the ecosystem that downloads and compiles a version of rlottie and statically links it.

These options are not incompatible with each other, so both could be implemented if desired. As I don't have windows, I cannot implement this myself, but PRs are welcome. Any implementing PR needs to have a CI setup that tests everything on windows as I won't be able to test locally.

Telegram skin recolor

Telegram can recolor some animations to different skin colors

but it's telegram's rlottie only feature
TelegramMessenger/rlottie@67f103b

If I understand correctly I need to implement capi in optional file and add feature to use it