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Fixes https://github.com/flutter/flutter/issues/163315 Fixes https://github.com/flutter/flutter/issues/163521 Fixes https://github.com/flutter/flutter/issues/142641 OpenGL has an inverted coordinate system (bottom left is zero) compared to Metal/Vulkan (top left is zero). We handle this by rendering things upside down on OpenGL. Unfortunately this can leak out of the renderer via readback (toImage), so we need to make sure to undo the inversion. This is not performed for the "TextureCoordinateSystem::kUploadFromHost" state as that indicates the texture is already "right side up".
Engine Testing
This directory contains the infrastructure for running tests on the engine, which are most often run by Flutter's continuous integration (CI) systems.
The tests themselves are located in other directories, closer to the source for
each platform, language, and variant. For instance, macOS engine unit tests
written in objective C are located in the same directory as the source files,
but with a Test suffix added (e.g. "FlutterEngineTest.mm" holds the tests for
"FlutterEngine.mm", and they are located in the same directory).
Testing the Engine locally
If you are working on the engine, you will want to be able to run tests locally.
In order to learn the details of how do that, please consult the Flutter Wiki page on the subject.