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Compute the necessary texture resolution using more accurate scaling information provided by Mozart scene node metrics events instead of the device pixel ratio provided by the Mozart view properties (which we might remove in the future). This allows us to allocate smaller textures when a Flutter view is being scaled down.
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// Copyright 2017 The Chromium 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_FLOW_EXPORT_NODE_H_
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#define FLUTTER_FLOW_EXPORT_NODE_H_
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#include <memory>
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#include <mx/eventpair.h>
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#include "apps/mozart/lib/scene/client/resources.h"
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#include "flutter/flow/scene_update_context.h"
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#include "lib/ftl/build_config.h"
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#include "lib/ftl/macros.h"
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#include "lib/ftl/memory/ref_counted.h"
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#include "lib/ftl/synchronization/mutex.h"
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#include "lib/ftl/synchronization/thread_annotations.h"
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#include "third_party/skia/include/core/SkPoint.h"
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namespace flow {
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// Represents a node which is being exported from the session.
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// This object is created on the UI thread but the entity node it contains
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// must be created and destroyed by the rasterizer thread.
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//
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// Therefore this object is thread-safe.
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class ExportNode : public ftl::RefCountedThreadSafe<ExportNode> {
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public:
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ExportNode(uint32_t export_token_handle);
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// Binds the export token to the entity node and adds it as a child of
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// the specified container.
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void Bind(SceneUpdateContext& context,
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mozart::client::ContainerNode& container,
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const SkPoint& offset,
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bool hit_testable);
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private:
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~ExportNode();
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ftl::Mutex mutex_;
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mx::eventpair export_token_ FTL_GUARDED_BY(mutex_);
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std::unique_ptr<mozart::client::EntityNode> node_ FTL_GUARDED_BY(mutex_);
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FRIEND_MAKE_REF_COUNTED(ExportNode);
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FRIEND_REF_COUNTED_THREAD_SAFE(ExportNode);
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FTL_DISALLOW_COPY_AND_ASSIGN(ExportNode);
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};
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} // namespace flow
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#endif // FLUTTER_FLOW_EXPORT_NODE_H_
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