b0b8daa7b2
Otherwise the callbacks may be called after FlutterNativeView is destroyed and is null. Also defensively check for whether the texture is already released in the callback because the callback may be called from another thread by a stale reference (see the comment). This closes https://github.com/flutter/flutter/issues/20951.
Flutter Engine
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
The Flutter Engine is a portable runtime for hosting Flutter applications. It implements Flutter's core libraries, including animation and graphics, file and network I/O, accessibility support, plugin architecture, and a Dart runtime and compile toolchain. Most developers will interact with Flutter via the Flutter Framework, which provides a modern, reactive framework, and a rich set of platform, layout and foundation widgets.
Flutter is still under development and we continue to add features. However, it is ready for use by early adopters who are willing to deal with the odd wrinkle or two along the way. We hope you try it out and send us feedback.
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For information about contributing code to the engine itself, please see CONTRIBUTING.md.
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For information about the engine's architecture, please see the wiki.
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