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https://github.com/RGBCube/serenity
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18cff5e0be
This is the origin timestamp of the same monotonic clock used for the performance.now() timestamp. I got a little confused while implementing this, since the numbers are very low. That's because it uses the CLOCK_MONOTONIC system clock, which we start counting from 0 at boot. :^)
58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <LibCore/ElapsedTimer.h>
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#include <LibWeb/Bindings/Wrappable.h>
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#include <LibWeb/DOM/EventTarget.h>
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namespace Web::HighResolutionTime {
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class Performance final
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: public DOM::EventTarget
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, public Bindings::Wrappable {
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public:
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using WrapperType = Bindings::PerformanceWrapper;
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explicit Performance(DOM::Window&);
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~Performance();
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double now() const { return m_timer.elapsed(); }
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double time_origin() const;
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virtual void ref_event_target() override;
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virtual void unref_event_target() override;
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virtual void dispatch_event(NonnullRefPtr<DOM::Event>) override;
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virtual Bindings::EventTargetWrapper* create_wrapper(JS::GlobalObject&) override;
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private:
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DOM::Window& m_window;
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Core::ElapsedTimer m_timer;
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};
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}
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