Glottie

Glottie is an OpenGL player for lottie animations. It is a C++ software that has been designed from ground-up for lightness and portability. Its scene graph builder, geometry generator and animation sequencer have been designed strictly for the scope of lottie, making it the leanest lottie player.

Current state of project

Glottie is currently still under development and does not support all the features of the lottie format, as has been documented at https://github.com/airbnb/lottie-web/tree/master/docs/json.

This player can play lotties, but with the following limitations:

• Borders are currently not supported.
• Tweening of basic shapes is not supported.
• Transformations of a parent layer or group (it) are not inherited.
• Shape items currently unsupported are gFill, gStroke, merge, repeater, stroke and trim.
• The only effects currently supported are color and fill.
• No external sources are currently supported.

Contributing

Learn how you can contribute to this project.

Compiling Glottie

From a single codebase, Glottie can be compiled to:

• WASM (using Emscripten)
• Windows
• Linux
• MacOS

WASM

Currently Glottie has a configuration to compile only with Emscripten. The script to compile for WASM is wasm_build.

The only prerequisite for running the wasm_build script is a working Emscripten installation.

Windows

Compilation to Windows has been set up to use CMake. A preconfigured CMakeLists.txt is included in the Glottie codebase, which has been configured by default to compile for Windows 10.

The CMake configuration uses winclude as the include directory.

Glottie is compiled to Windows using Google ANGLE, and therefore uses ANGLE's EGL and GLES - with the compiler yielding a native DirectX player. The only other prerequisite library is SDL2.

Linux

Compilation to Linux is facilitated by the Bash script linux_build. The linux_build script uses include as the include directory.

MacOS

Compilation to MacOS is accomplished by running the script macos_build. The macos_build script uses include as the include directory.

Testing Glottie

For all platforms other than WASM, Glottie presently reads a JSON file from stdin. Hence, to run Glottie, simply pipe in a JSON file.

Linux and MacOS

cat <JSONfile> | glottie

Windows

type <JSONfile> | <CMAKE_INSTALL_PREFIX>/glottie.exe

WASM

The index.html file in examples/wasm is a base template for loading the WASM player.