rlottie

rlottie is a platform independent standalone c++ library for rendering vector based animations and art in realtime.

Lottie loads and renders animations and vectors exported in the bodymovin JSON format. Bodymovin JSON can be created and exported from After Effects with bodymovin, Sketch with Lottie Sketch Export, and from Haiku.

For the first time, designers can create and ship beautiful animations without an engineer painstakingly recreating it by hand. Since the animation is backed by JSON they are extremely small in size but can be large in complexity!

Here are small samples of the power of Lottie.

Contents

• Building Lottie
  • Meson Build
  • Cmake Build
  • Test
• Demo
• Previewing Lottie JSON Files
• Quick Start
• Dynamic Property
• Supported After Effects Features
• Issues or Feature Requests?

Building Lottie

rottie supports meson and cmake build system. rottie is written in C++14. and has a public header dependancy of C++11

Meson Build

install meson and ninja if not already installed.

Run meson to configure rlottie

meson build

Run ninja to build rlottie

ninja -C build

Cmake Build

Install cmake if not already installed

Create a build directory for out of source build

mkdir build

Run cmake command inside build directory to configure rlottie.

cd build
cmake ..

# install in a different path. eg ~/test/usr/lib

cmake -DCMAKE_INSTALL_PREFIX=~/test ..

Run make to build rlottie

make -j 2

To install rlottie library

make install

Test

Configure to build test

meson configure -Dtest=true

Build test suit

ninja

Run test suit

ninja test

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Demo

If you want to see rlottie librray in action without building it please visit rlottie online viewer

While building rlottie library it generates a simple lottie to GIF converter which can be used to convert lottie json file to GIF file.

Run Demo

lottie2gif [lottie file name]

Previewing Lottie JSON Files

Please visit rlottie online viewer

rlottie online viewer uses rlottie wasm library to render the resource locally in your browser. To test your JSON resource drag and drop it to the browser window.

Quick Start

Lottie loads and renders animations and vectors exported in the bodymovin JSON format. Bodymovin JSON can be created and exported from After Effects with bodymovin, Sketch with Lottie Sketch Export, and from Haiku.

You can quickly load a Lottie animation with:

std::unique_ptr<rlottie::Animation> animation = 
					rlottie::loadFromFile(std::string("absolute_path/test.json"));

You can load a lottie animation from raw data with:

std::unique_ptr<rlottie::Animation> animation = rlottie::loadFromData(std::string(rawData),
                                                                      std::string(cacheKey));

Properties like frameRate , totalFrame , duration can be queried with:

# get the frame rate of the resource. 
double frameRate = animation->frameRate();

#get total frame that exists in the resource
size_t totalFrame = animation->totalFrame();

#get total animation duration in sec for the resource 
double duration = animation->duration();

Render a particular frame in a surface buffer immediately with:

rlottie::Surface surface(buffer, width , height , stride);
animation->renderSync(frameNo, surface); 

Render a particular frame in a surface buffer asyncronousely with:

rlottie::Surface surface(buffer, width , height , stride);
# give a render request
std::future<rlottie::Surface> handle = animation->render(frameNo, surface);
...
#when the render data is needed
rlottie::Surface surface = handle.get();

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Dynamic Property

Update me.

Supported After Effects Features

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Issues or Feature Requests?

File github issues for anything that is broken. Be sure to check the list of supported features before submitting. If an animation is not working, please attach the After Effects file to your issue. Debugging without the original can be very difficult. For immidiate assistant or support please reach us in Gitter