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48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
# external_textures
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Tests external texture rendering between a native[^1] platform and Flutter.
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Part of Flutter's API for [plugins](https://docs.flutter.dev/development/packages-and-plugins/developing-packages#plugin) includes passing _external textures_, or textures
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created outside of Flutter, to Flutter, typically using the [`Texture`][texture]
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widget. This is useful for plugins that render video, or for plugins that
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interact with the camera.
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For example:
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- [`packages/camera`][camera]
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- [`packages/video_player`][video_player]
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[texture]: https://api.flutter.dev/flutter/widgets/Texture-class.html
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[camera]: https://github.com/flutter/packages/tree/8255fbed74465425a1ec06a1804225e705e29f52/packages/camera
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[video_player]: https://github.com/flutter/packages/tree/8255fbed74465425a1ec06a1804225e705e29f52/packages/video_player
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Because external textures are created outside of Flutter, there is often subtle
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translation that needs to happen between the native platform and Flutter, which
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is hard to observe. These integration tests are designed to help catch these
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subtle translation issues.
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## How it works
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- Each `lib/*_main.dart` file is a Flutter app instrumenting a test case.
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- There is a corresponding `test_driver/*_test.dart` that runs assertions.
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To run the test cases locally, use `flutter drive`[^2]:
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```sh
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flutter drive lib/frame_rate_main.dart --driver test_driver/frame_rate_test.dart
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```
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> [!TIP]
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> On CI, the test cases are run within our [device lab](../../devicelab/README.md).
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>
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> See [`devicelab/lib/tasks/integration_tests.dart`](../../devicelab/lib/tasks/integration_tests.dart)
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> and search for `createExternalUiFrameRateIntegrationTest`.
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>
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> The actual tests are run by task runners:
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>
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> - [Android](../../devicelab/bin/tasks/external_textures_integration_test.dart)
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> - [iOS](../../devicelab/bin/tasks/external_textures_integration_test_ios.dart)
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[^1]: Only iOS and Android.
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[^2]: Unfortunately documentation is quite limited. See [#142021](https://github.com/flutter/flutter/issues/142021).
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