editor: nine-slicing core data type definitions This PR adds the core data types to support n-slicing. There are three main types: Axis, NSlicer and NSlicerTileMode. 1. Axis: I didn't want to make this super specific, since it could be used for grids later. So rn, it just represents some position in some dimension, and can either be a value in terms of a positional unit (like 10px) or bounds percentage (like 10%). 2. NSlicer: It's as simple as a component gets, we'll just use it to be a parent of all the n-slicer Axes, and have it be a child of Image later. 3. NSlicerTileMode: The main data here is 'style'. We said to use patchX and patchY separately from patchIndex. The last one is persisted in file, while the other two are actually used at runtime. The non-json files are auto generated, with the runtime json files copy pasted from the dev/defs version. I verified that the editor still runs, and the runtime also runs without error. Next up, I'll use these definitions to change editor behavior. Documentation: https://www.notion.so/rive-app/9-Slice-Tech-Proposal-Image-only-50b25ea8e79c4efabb681110e288f064#15f3a49ce3534baeafc31c37fb30cc0b For a rough direction of how to implement nine-slicing, check out this research branch: https://github.com/rive-app/rive/compare/master...susan/nine-slice-research Diffs= ed56d2de6 editor: nine-slicing core data type definitions (#7840) Co-authored-by: Susan Wang <susan@rive.app>

Rive C++ is a runtime library for Rive, a real-time interactive design and animation tool.
The C++ runtime for Rive provides these runtime features:
We use premake5. The Rive dev team primarily works on MacOS. There is some work done by the community to also support Windows and Linux. PRs welcomed for specific platforms you wish to support! We encourage you to use premake as it's highly extensible and configurable for a variety of platforms.
In the rive-cpp directory, run build.sh to debug build and build.sh release for a release build.
If you've put the premake5 executable in the rive-cpp/build folder, you can run it with PATH=.:$PATH ./build.sh
Rive makes use of clang vector builtins, which are, as of 2022, still a work in progress. Please use clang and ensure you have the latest version.
cd skia/dependencies ./make_skia.sh // this will invoke get_skia.sh
To build viewer (plus you'll needed CMake installed)
./make_viewer_dependencies.sh
Uses the Catch2 testing framework.
cd dev ./test.sh
In the dev directory, run test.sh to compile and execute the tests.
(if you've installed premake5 in rive-cpp/build, you can run it with PATH=../../build:$PATH ./test.sh)
The tests live in rive/test. To add new tests, create a new xxx_test.cpp file here. The test harness will automatically pick up the new file.
There's a VSCode command provided to run tests from the Tasks: Run Task command palette.
rive-cpp uses clang-format, you can install it with brew on MacOS: brew install clang-format.
Note that if you‘re on MacOS you’ll want to install valgrind, which is somewhat complicated these days. This is the easiest solution (please PR a better one when it becomes available).
brew tap LouisBrunner/valgrind brew install --HEAD LouisBrunner/valgrind/valgrind
You can now run the all the tests through valgrind by running test.sh memory.
If you want to examine the generated assembly code per cpp file, install Disassembly Explorer in VSCode.
A disassemble task is provided to compile and preview the generated assembly. You can reach it via the Tasks: Run Task command palette or you can bind it to a shortcut by editing your VSCode keybindings.json:
[
{
"key": "cmd+d",
"command": "workbench.action.tasks.runTask",
"args": "disassemble"
}
]