Dan Field 0a6301d5ca Listen for display refresh changes and report them correctly (flutter/engine#29800)
This makes sure the frame timings recorder and vsync waiter implementations get
the correct refresh rate if or when it adjusts at runtime. This should be OK
because we'll only query the refresh rate when the display metrics actually
change, which is much less frequent than every frame. I experimented with an NDK
implementation in the previous patch, but that vastly restricts the API levels
we can support, and currently on API 30 and 31 it just calls Java methods
through JNI anyway.

I've refactored the way Display updates are reported so that AndroidDisplay can
just dynamically get the refresh rate correctly. These values are used by a
service protocol extension and by some Stopwatches on the CompositorContext.

See also #29765

Fixes flutter/flutter#93688
Fixes flutter/flutter#93698
2021-11-18 13:09:26 -08:00

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/shell/common/display.h"
namespace flutter {
double Display::GetRefreshRate() const {
return refresh_rate_;
}
} // namespace flutter