OpenCompGraph
The OpenCompGraph (or OCG pronounced Ohh-See-Gee) is a cross-platform library Rust/C++ library to provide a small 2D Image Compositing Graph framework with an emphisis on concurent and parallel image caching, real-time image sequence playback, and efficent techniques to transfer data within image processing nodes.
This is the core library used in Open Comp Graph Maya.
This project and API is not ready for production (yet). The function, nodes, classes may change at any moment. See the Roadmap section (below) and issues page for more details. If you have suggestions for features or would like to test, please do.
Road Map
Below is a brief description on some of the features planed and being worked on.
| Feature Description | Status |
|---|---|
| MS Windows support (MSVC) | Done |
| Linux support (GCC) | To be started |
| MacOS support (Clang) | To be started |
| Rust to C++ API | Done |
| Node connection frame work. | Done |
| Node attribute getting/setting. | Done |
| Node image data streams. | Done |
| Multi-frame Execution context. | Done |
| Logging infrastructure for simple debug. | Done |
| JPEG image reading support. | Done |
| JPEG image writing support. | Done |
| PNG image reading support. (8-bit only) | Done |
| PNG image writing support. (8-bit only) | Done |
| TARGA image reading support. | Done |
| TARGA image writing support. | Done |
| TIFF image reading support. (8-bit only) | Done |
| TIFF image writing support. (8-bit only) | Done |
| EXR image reading support. | Done |
| EXR image writing support. | Done |
| Generating polygon geometry (for 3D texture playback). | Done |
| Applying deformers to polygon vertices. | Done |
| Convert Lens distortion (deformers) to ST-Maps | To be started |
| Transform Matrix node data concatenation | Done |
| Pixel Deformer node data concatenation (lens distortion) | Done |
| Color Matrix node data concatenation (lens distortion) | Done |
| Image Sequence caching and real-time playback. | Done |
| Multi-threaded/asyncronous graph execution. | To be started |
| Configuration with files and environment variables. | In progress |
| Internal Unsigned Integer 8-bit Pixel Format. | Done |
| Internal Unsigned Integer 16-bit Pixel Format. | Done |
| Internal "Half" Floating point 16-bit Pixel Format. | Done |
| Internal Floating Point 32-bit Pixel Format. | Done |
| Image metadata display window and data window support. | Done |
| Standalone executable to read and execute node graphs. | To be started |
| LDPK integration for lens distortion and image deformation. | In progress |
| OpenImageIO integration for image reading and image processing. | In progress |
| OpenColorIO integration for accurate and configurable color workflow. | In progress |
| Create a Python API to wrap the library. | To be started |
| R&D - Decrease RAM usage while still working in floating-point linear color. | In progress |
| Write out cached data as loadable files for improved read-performance. | In progress |
These are the nodes that are planed or currently implemented.
| Node Name | Description | Status |
|---|---|---|
| ReadImage | Read an image file (JPEG, PNG, TIFF, TGA) as a stream. | Done |
| WriteImage | Write an image data stream to disk (JPEG, PNG, TIFF, TGA). | Done |
| LensDistort | Deforms the image pixels with a brownian lens distortion function. | Done |
| ColorGrade | Applies a set of color operations to the input image stream | Done |
| ColorCorrect | Change saturation and contrast of image colors. | To be started |
| Transform | Applies a 2D transform to the input image stream | Done |
| Null | A "no op" node, that does nothing. | Done |
| Switch | Choose the input stream using a number. | To be started |
| Shuffle | Re-order input image channels as output channels. | To be started |
| Viewer | Pre-defined operations available to viewing a node stream. | WIP |
| MergeImage | Blend/Combine 1 or more images together into a single image. | WIP |
| CropImage | Remove pixel data outside a square region. | WIP |
| ResampleImage | Increase/decrease image resolution for fast-preview results. | Done |
| ReformatImage | Change the resolution of the image data. | To be started |
| ColorExposure | Change the colors of an image using exposure values (EV). | To be started |
| ConvertSTMap | Apply a deformer as pixel colours. | To be started |
| KeyerImage | Calculate an alpha channel for a green/blue-screen image. | To be started |
| BlurImage | Blur (convolve) an image using a 2D kernel. | To be started |
| FrameHold | Hold all images upstream to the the given frame number. | To be started |
| FrameOffset | Add/subtract a frame number from the current evaluation frame. | To be started |
Building
To build (compile) the plug-in follow the steps in BUILD.md.
License
Open Comp Graph (OCG) is licensed under the Lesser GNU Public License v3.0 or LGPL-3.0 for short. This means the project is Free Open Source Software, and will always stay Free Open Source Software: TL;DR.
Please read the LICENSE (text) file for details.
Bugs, Questions or Issues?
All issues are listed in the issues page on the project page. If you have found a bug, please submit an issue and we will try to address it as soon as possible.