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413e212ea8
The Track itself caches the Samples after each processing step which allows it to be queried without the need to process it every time. This result is queried by the WaveWidget which then caches the result to prevent unnecessary heap allocations every paint event.
40 lines
1,004 B
C++
40 lines
1,004 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FixedArray.h>
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#include <LibAudio/Sample.h>
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#include <LibGUI/Frame.h>
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class TrackManager;
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class WaveWidget final : public GUI::Frame {
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C_OBJECT(WaveWidget)
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public:
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virtual ~WaveWidget() override = default;
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ErrorOr<void> set_sample_size(size_t sample_size)
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{
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TRY(m_samples.try_resize(sample_size));
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return {};
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}
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private:
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// Scales the sample-y value down by a bit, so that it doesn't look like it is clipping.
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static constexpr float rescale_factor = 1.2f;
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explicit WaveWidget(TrackManager&);
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virtual void paint_event(GUI::PaintEvent&) override;
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int sample_to_y(float sample, float sample_max) const;
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TrackManager& m_track_manager;
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Vector<Audio::Sample> m_samples;
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};
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