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160bda7228
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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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#include "SampleWidget.h"
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#include <AK/Math.h>
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#include <LibAudio/Buffer.h>
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#include <LibGUI/Painter.h>
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void SampleWidget::paint_event(GUI::PaintEvent& event)
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{
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GUI::Frame::paint_event(event);
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GUI::Painter painter(*this);
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painter.add_clip_rect(event.rect());
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painter.fill_rect(frame_inner_rect(), Color::Black);
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float sample_max = 0;
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int count = 0;
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int x_offset = frame_inner_rect().x();
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int x = x_offset;
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int y_offset = frame_inner_rect().center().y();
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if (m_buffer) {
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int samples_per_pixel = m_buffer->sample_count() / frame_inner_rect().width();
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for (int sample_index = 0; sample_index < m_buffer->sample_count() && (x - x_offset) < frame_inner_rect().width(); ++sample_index) {
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float sample = AK::fabs((float)m_buffer->samples()[sample_index].left);
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sample_max = max(sample, sample_max);
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++count;
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if (count >= samples_per_pixel) {
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Gfx::IntPoint min_point = { x, y_offset + static_cast<int>(-sample_max * frame_inner_rect().height() / 2) };
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Gfx::IntPoint max_point = { x++, y_offset + static_cast<int>(sample_max * frame_inner_rect().height() / 2) };
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painter.draw_line(min_point, max_point, Color::Green);
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count = 0;
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sample_max = 0;
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}
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}
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} else {
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painter.draw_line({ x, y_offset }, { frame_inner_rect().width(), y_offset }, Color::Green);
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}
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}
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void SampleWidget::set_buffer(RefPtr<Audio::Buffer> buffer)
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{
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if (m_buffer == buffer)
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return;
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m_buffer = buffer;
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update();
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}
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