Clementine-audio-player-Mac.../src/analyzers/rainbowanalyzer.cpp

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/* This file is part of Clementine.
Copyright 2011, Tyler Rhodes <tyler.s.rhodes@gmail.com>
Copyright 2011-2012, 2014, David Sansome <me@davidsansome.com>
Copyright 2014, Alibek Omarov <a1ba.omarov@gmail.com>
Copyright 2014, John Maguire <john.maguire@gmail.com>
Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
Copyright 2014-2015, Mark Furneaux <mark@furneaux.ca>
Copyright 2015, Arun Narayanankutty <n.arun.lifescience@gmail.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "rainbowanalyzer.h"
#include <QBrush>
#include <QPainter>
#include <QPen>
#include <QTimerEvent>
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#include <cmath>
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#include "core/arraysize.h"
#include "core/logging.h"
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using Analyzer::Scope;
const int Rainbow::RainbowAnalyzer::kHeight[] = {21, 33};
const int Rainbow::RainbowAnalyzer::kWidth[] = {34, 53};
const int Rainbow::RainbowAnalyzer::kFrameCount[] = {6, 16};
const int Rainbow::RainbowAnalyzer::kRainbowHeight[] = {21, 16};
const int Rainbow::RainbowAnalyzer::kRainbowOverlap[] = {13, 15};
const int Rainbow::RainbowAnalyzer::kSleepingHeight[] = {24, 33};
const char* Rainbow::NyanCatAnalyzer::kName = "Nyanalyzer Cat";
const char* Rainbow::RainbowDashAnalyzer::kName = "Rainbow Dash";
const float Rainbow::RainbowAnalyzer::kPixelScale = 0.02f;
Rainbow::RainbowAnalyzer::RainbowType Rainbow::RainbowAnalyzer::rainbowtype;
Rainbow::RainbowAnalyzer::RainbowAnalyzer(const RainbowType& rbtype,
QWidget* parent)
: Analyzer::Base(parent, 9),
timer_id_(startTimer(kFrameIntervalMs)),
frame_(0),
current_buffer_(0),
available_rainbow_width_(0),
px_per_frame_(0),
x_offset_(0),
background_brush_(QColor(0x0f, 0x43, 0x73)) {
rainbowtype = rbtype;
cat_dash_[0] = QPixmap(":/nyancat.png");
cat_dash_[1] = QPixmap(":/rainbowdash.png");
memset(history_, 0, sizeof(history_));
for (int i = 0; i < kRainbowBands; ++i) {
colors_[i] = QPen(QColor::fromHsv(i * 255 / kRainbowBands, 255, 255),
kRainbowHeight[rainbowtype] / kRainbowBands,
Qt::SolidLine, Qt::FlatCap, Qt::RoundJoin);
// pow constants computed so that
// | band_scale(0) | ~= .5 and | band_scale(5) | ~= 32
band_scale_[i] =
-std::cos(M_PI * i / (kRainbowBands - 1)) * 0.5 * std::pow(2.3, i);
}
}
void Rainbow::RainbowAnalyzer::transform(Scope& s) { fht_->spectrum(s.data()); }
void Rainbow::RainbowAnalyzer::timerEvent(QTimerEvent* e) {
if (e->timerId() == timer_id_) {
frame_ = (frame_ + 1) % kFrameCount[rainbowtype];
} else {
Analyzer::Base::timerEvent(e);
}
}
void Rainbow::RainbowAnalyzer::resizeEvent(QResizeEvent* e) {
// Invalidate the buffer so it's recreated from scratch in the next paint
// event.
buffer_[0] = QPixmap();
buffer_[1] = QPixmap();
available_rainbow_width_ =
width() - kWidth[rainbowtype] + kRainbowOverlap[rainbowtype];
px_per_frame_ =
static_cast<float>(available_rainbow_width_) / (kHistorySize - 1) + 1;
x_offset_ = px_per_frame_ * (kHistorySize - 1) - available_rainbow_width_;
}
void Rainbow::RainbowAnalyzer::analyze(QPainter& p, const Analyzer::Scope& s,
bool new_frame) {
// Discard the second half of the transform
const int scope_size = s.size() / 2;
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if ((new_frame && is_playing_) ||
(buffer_[0].isNull() && buffer_[1].isNull())) {
// Transform the music into rainbows!
for (int band = 0; band < kRainbowBands; ++band) {
float* band_start = history_ + band * kHistorySize;
// Move the history of each band across by 1 frame.
memmove(band_start, band_start + 1, (kHistorySize - 1) * sizeof(float));
}
// Now accumulate the scope data into each band. Should maybe use a series
// of band pass filters for this, so bands can leak into neighbouring bands,
// but for now it's a series of separate square filters.
const int samples_per_band = scope_size / kRainbowBands;
int sample = 0;
for (int band = 0; band < kRainbowBands; ++band) {
float accumulator = 0.0;
for (int i = 0; i < samples_per_band; ++i) {
accumulator += s[sample++];
}
history_[(band + 1) * kHistorySize - 1] = accumulator * band_scale_[band];
}
// Create polylines for the rainbows.
QPointF polyline[kRainbowBands * kHistorySize];
QPointF* dest = polyline;
float* source = history_;
const float top_of = static_cast<float>(height()) / 2 -
static_cast<float>(kRainbowHeight[rainbowtype]) / 2;
for (int band = 0; band < kRainbowBands; ++band) {
// Calculate the Y position of this band.
const float y = static_cast<float>(kRainbowHeight[rainbowtype]) /
(kRainbowBands + 1) * (band + 0.5) +
top_of;
// Add each point in the line.
for (int x = 0; x < kHistorySize; ++x) {
*dest = QPointF(px_per_frame_ * x, y + *source * kPixelScale);
++dest;
++source;
}
}
// Do we have to draw the whole rainbow into the buffer?
if (buffer_[0].isNull()) {
for (int i = 0; i < 2; ++i) {
buffer_[i] = QPixmap(QSize(width() + x_offset_, height()));
buffer_[i].fill(background_brush_.color());
}
current_buffer_ = 0;
QPainter buffer_painter(&buffer_[0]);
buffer_painter.setRenderHint(QPainter::Antialiasing);
for (int band = kRainbowBands - 1; band >= 0; --band) {
buffer_painter.setPen(colors_[band]);
buffer_painter.drawPolyline(&polyline[band * kHistorySize],
kHistorySize);
buffer_painter.drawPolyline(&polyline[band * kHistorySize],
kHistorySize);
}
} else {
const int last_buffer = current_buffer_;
current_buffer_ = (current_buffer_ + 1) % 2;
// We can just shuffle the buffer along a bit and draw the new frame's
// data.
QPainter buffer_painter(&buffer_[current_buffer_]);
buffer_painter.setRenderHint(QPainter::Antialiasing);
buffer_painter.drawPixmap(
0, 0, buffer_[last_buffer], px_per_frame_, 0,
x_offset_ + available_rainbow_width_ - px_per_frame_, 0);
buffer_painter.fillRect(
x_offset_ + available_rainbow_width_ - px_per_frame_, 0,
kWidth[rainbowtype] - kRainbowOverlap[rainbowtype] + px_per_frame_,
height(), background_brush_);
for (int band = kRainbowBands - 1; band >= 0; --band) {
buffer_painter.setPen(colors_[band]);
buffer_painter.drawPolyline(&polyline[(band + 1) * kHistorySize - 3],
3);
}
}
}
// Draw the buffer on to the widget
p.drawPixmap(0, 0, buffer_[current_buffer_], x_offset_, 0, 0, 0);
// Draw rainbow analyzer (nyan cat or rainbowdash)
// Nyan nyan nyan nyan dash dash dash dash.
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if (!is_playing_) {
// Ssshhh!
p.drawPixmap(SleepingDestRect(rainbowtype), cat_dash_[rainbowtype],
SleepingSourceRect(rainbowtype));
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} else {
p.drawPixmap(DestRect(rainbowtype), cat_dash_[rainbowtype],
SourceRect(rainbowtype));
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}
}
Rainbow::NyanCatAnalyzer::NyanCatAnalyzer(QWidget* parent)
: RainbowAnalyzer(Rainbow::RainbowAnalyzer::Nyancat, parent) {}
Rainbow::RainbowDashAnalyzer::RainbowDashAnalyzer(QWidget* parent)
: RainbowAnalyzer(Rainbow::RainbowAnalyzer::Dash, parent) {}