Skia VS OpenSceneGraph

Flutter offers near-native performance with a rendering canvas powered by Skia and the native platform channels concept.

Skia is a popular open-source 2D graphics library used by major platforms like Google Chrome, Chrome OS, Android, and Flutter as their default graphics engine. The library is sponsored and managed by Google, while the development is overseen by Skia’s engineering team.

The JDK can easily be reduced to 35MB now (file size) and soon with Panama we could have a very good binding to Skia. I believe JetBrains is working on this.

I would suggest looking at either Cairo or Skia. Both are 2D graphics libraries designed for drawing on or off screen. They both have C/C++ apis, are fast and have tools for implementing pretty UIs

Skottie: Lottie player using the Skia graphics library[0][1]

Skia powers Google Chrome[2], Flutter, & Fuchia[3].

[0]: https://skia.org/docs/user/modules/skottie/

Android uses JNI to call native c functions to handle in scaling in pretty much any container derived from View. These C functions are provided by SKIA open source API. The specific function you're looking for is ScalePixels . They say that they use Bicubic in the comments

Flutter is much closer to a "game engine" as it draws it's components using Skia [1] compared to e.g. React Native that creates platform native elements. So you are right, you won't get the underlying platform's widgets. Flutter should act as an intermediary and make this as frictionless as possible though so OS level changes will be propagated or exposed by Flutter or you app directly accesses them but I have no practical experiance in this.

This is not always so cut and dry awful as you might think though. The platform native widgets also have limitations and expectations that might not fit your vision of the app so even fully "native" apps might re-invent the wheel in a couple of places to make things work as they want. Also I've hardly ever come accross an application that works by just combining the basic platform widgets and not look and feel pretty basic.

Also cross platform apps not respecting e.g. Zoom, Resolution, Orientation, A11y, etc. is more often than not, just the developer's not implementing the required things. The framework might support all of these use-cases but not fully automatic in some cases.

[1] https://skia.org/

Chrome uses Skia which AFAIK is GPU accelerated. Not sure about the SVG part though.

https://skia.org/

https://en.wikipedia.org/wiki/Skia_Graphics_Engine

I took a look at using Skia, but the C bindings are marked as not stable and it does not look like an easy to distribute library (plus compiling it takes a long time).

browse github and try to contribute. I started with OpenSceneGraph

I have been using OpenSceneGraph for over 20 years. It is used in the military a lot and I myself have seen it used to simulate war scenarios with realtime data aboard of a command-and-control center of a battleship.

Does http://www.openscenegraph.org/ fit?

Speed Dreams: It is a fork of TORCS, and was born as the need to include many more functions to the latter. In Speed Dreams the menus would be completely redesigned, adding many more options and making them much more intuitive; the game acquired dynamic time, improvements in reflections, career mode, a new simulation mode and multi threading. Over time many more options were implemented, such as local multiplayer mode, Force Feedback, and of course more and better cars and tracks, a new and more powerfull graphic engine (OpenSceneGraph) among other things, making it a much more complete game than its predecessor. They recently they have presented version 2.2.3. You can also install it in AppImage and Flatpak format.

Here is an example: https://github.com/openscenegraph/OpenSceneGraph/blob/master/examples/osgsimplegl3/osgsimplegl3.cpp

openscenegraph (mainly focuses on graphics, used by openmw for example)

Is not little, is very complex open source racing simulator. There are a lot of cars, categories, tracks. The physics has a lot of work . About the graphics, the devs are working on change the graphic engine to OpenSceneGraph, that actually works, but needs much more polishing. You can see his quality on this video: https://youtu.be/4daTgcxEWRg

I love Godot for a complete game engine. For just the renderer you could consider http://www.openscenegraph.org

-Finish the implementation of the new OpenSceneGraph rendering engine: The game allows to replace the default renderer (ssggraph) with OpenSceneGraph, but it still needs to implement many features to be completed, as well as further optimisation.