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## Description As the related issue refer, the application may be doing too much work on its main thread even in a simple hello_world demo. That is because the creation of `Engine` on the ui thread takes a noticeable time, and it is blocking the platform thread in order to run `Shell::Setup` synchronously. The cost of `Engine`'s constructor is mainly about the creating of root isolate. Actually, there used to be another time-consuming process, the default font manager setup, which was resolved by https://github.com/flutter/engine/pull/18225. Similar to https://github.com/flutter/engine/pull/18225, this pr move the creation of root isolate out from creating `Engine`. After this action, the main thread blocking is quite an acceptable slice. ## Related Issues https://github.com/flutter/flutter/issues/40563 could be resolved by this pr.
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_RUNTIME_RUNTIME_DELEGATE_H_
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#define FLUTTER_RUNTIME_RUNTIME_DELEGATE_H_
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#include <memory>
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#include <vector>
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#include "flutter/flow/layers/layer_tree.h"
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#include "flutter/lib/ui/semantics/custom_accessibility_action.h"
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#include "flutter/lib/ui/semantics/semantics_node.h"
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#include "flutter/lib/ui/text/font_collection.h"
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#include "flutter/lib/ui/window/platform_message.h"
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#include "third_party/dart/runtime/include/dart_api.h"
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namespace flutter {
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class RuntimeDelegate {
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public:
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virtual std::string DefaultRouteName() = 0;
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virtual void ScheduleFrame(bool regenerate_layer_tree = true) = 0;
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virtual void Render(std::unique_ptr<flutter::LayerTree> layer_tree) = 0;
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virtual void UpdateSemantics(SemanticsNodeUpdates update,
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CustomAccessibilityActionUpdates actions) = 0;
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virtual void HandlePlatformMessage(fml::RefPtr<PlatformMessage> message) = 0;
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virtual FontCollection& GetFontCollection() = 0;
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virtual void OnRootIsolateCreated() = 0;
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virtual void UpdateIsolateDescription(const std::string isolate_name,
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int64_t isolate_port) = 0;
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virtual void SetNeedsReportTimings(bool value) = 0;
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virtual std::unique_ptr<std::vector<std::string>>
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ComputePlatformResolvedLocale(
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const std::vector<std::string>& supported_locale_data) = 0;
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protected:
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virtual ~RuntimeDelegate();
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};
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} // namespace flutter
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#endif // FLUTTER_RUNTIME_RUNTIME_DELEGATE_H_
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