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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "SampleWidget.h"
#include <LibAudio/Buffer.h>
#include <LibGUI/Painter.h>
#include <LibM/math.h>
SampleWidget::SampleWidget()
{
}
SampleWidget::~SampleWidget()
{
}
void SampleWidget::paint_event(GUI::PaintEvent& event)
{
GUI::Frame::paint_event(event);
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(frame_inner_rect(), Color::Black);
float sample_max = 0;
int count = 0;
int x_offset = frame_inner_rect().x();
int x = x_offset;
int y_offset = frame_inner_rect().center().y();
if (m_buffer) {
int samples_per_pixel = m_buffer->sample_count() / frame_inner_rect().width();
for (int sample_index = 0; sample_index < m_buffer->sample_count() && (x - x_offset) < frame_inner_rect().width(); ++sample_index) {
float sample = fabsf((float)m_buffer->samples()[sample_index].left);
sample_max = max(sample, sample_max);
++count;
if (count >= samples_per_pixel) {
Gfx::IntPoint min_point = { x, y_offset + static_cast<int>(-sample_max * frame_inner_rect().height() / 2) };
Gfx::IntPoint max_point = { x++, y_offset + static_cast<int>(sample_max * frame_inner_rect().height() / 2) };
painter.draw_line(min_point, max_point, Color::Green);
count = 0;
sample_max = 0;
}
}
} else {
painter.draw_line({ x, y_offset }, { frame_inner_rect().width(), y_offset }, Color::Green);
}
}
void SampleWidget::set_buffer(Audio::Buffer* buffer)
{
if (m_buffer == buffer)
return;
m_buffer = buffer;
update();
}
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