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