182 lines
5.8 KiB
C++
182 lines
5.8 KiB
C++
/* This file was part of Clementine.
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Copyright 2012, David Sansome <me@davidsansome.com>
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Strawberry 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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Strawberry 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 Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QtGlobal>
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#include <QObject>
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#include <QArrayData>
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#include <QList>
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#include <QByteArray>
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#include <QString>
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#include <QImage>
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#include <QPainter>
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#include <QPalette>
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#include <QColor>
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#include <QRect>
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#include <QSize>
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#include "moodbarrenderer.h"
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ColorVector MoodbarRenderer::Colors(const QByteArray &data, const MoodbarStyle style, const QPalette &palette) {
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const int samples = static_cast<int>(data.size() / 3);
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// Set some parameters based on the moodbar style
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StyleProperties properties;
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switch (style) {
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case MoodbarStyle::Angry:
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properties = StyleProperties(samples / 360 * 9, 45, -45, 200, 100);
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break;
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case MoodbarStyle::Frozen:
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properties = StyleProperties(samples / 360 * 1, 140, 160, 50, 100);
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break;
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case MoodbarStyle::Happy:
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properties = StyleProperties(samples / 360 * 2, 0, 359, 150, 250);
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break;
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case MoodbarStyle::Normal:
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properties = StyleProperties(samples / 360 * 3, 0, 359, 100, 100);
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break;
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case MoodbarStyle::SystemPalette:
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default: {
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const QColor highlight_color(palette.color(QPalette::Active, QPalette::Highlight));
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properties.threshold_ = samples / 360 * 3;
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properties.range_start_ = (highlight_color.hsvHue() - 20 + 360) % 360;
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properties.range_delta_ = 20;
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properties.sat_ = highlight_color.hsvSaturation();
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properties.val_ = highlight_color.value() / 2;
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}
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}
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const unsigned char *data_p = reinterpret_cast<const unsigned char*>(data.constData());
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int hue_distribution[360];
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int total = 0;
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memset(hue_distribution, 0, sizeof(hue_distribution));
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ColorVector colors;
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colors.reserve(samples);
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// Read the colors, keeping track of some histograms
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for (int i = 0; i < samples; ++i) {
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QColor color;
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color.setRed(static_cast<int>(*data_p++));
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color.setGreen(static_cast<int>(*data_p++));
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color.setBlue(static_cast<int>(*data_p++));
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colors << color;
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const int hue = qMax(0, color.hue());
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if (hue_distribution[hue]++ == properties.threshold_) {
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total++;
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}
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}
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total = qMax(total, 1);
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// Remap the hue values to be between rangeStart and
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// rangeStart + rangeDelta. Every time we see an input hue
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// above the threshold, increment the output hue by
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// (1/total) * rangeDelta.
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for (int i = 0, n = 0; i < 360; i++) {
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hue_distribution[i] = ((hue_distribution[i] > properties.threshold_ ? n++ : n) * properties.range_delta_ / total + properties.range_start_) % 360;
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}
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// Now huedist is a hue mapper: huedist[h] is the new hue value
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// for a bar with hue h
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for (ColorVector::iterator it = colors.begin(); it != colors.end(); ++it) {
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const int hue = qMax(0, it->hue());
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*it = QColor::fromHsv(qBound(0, hue_distribution[hue], 359), qBound(0, it->saturation() * properties.sat_ / 100, 255), qBound(0, it->value() * properties.val_ / 100, 255));
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}
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return colors;
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}
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void MoodbarRenderer::Render(const ColorVector &colors, QPainter *p, const QRect rect) {
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// Sample the colors and map them to screen pixels.
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ColorVector screen_colors;
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screen_colors.reserve(rect.width());
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for (int x = 0; x < rect.width(); ++x) {
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int r = 0;
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int g = 0;
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int b = 0;
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int start = static_cast<int>(x * colors.size() / rect.width());
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int end = static_cast<int>((x + 1) * colors.size() / rect.width());
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if (start == end) end = qMin(start + 1, static_cast<int>(colors.size() - 1));
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for (int j = start; j < end; j++) {
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r += colors[j].red();
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g += colors[j].green();
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b += colors[j].blue();
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}
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const int n = qMax(1, end - start);
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screen_colors.append(QColor(r / n, g / n, b / n));
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}
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// Draw the actual moodbar.
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for (int x = 0; x < rect.width(); x++) {
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int h = 0, s = 0, v = 0;
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screen_colors[x].getHsv(&h, &s, &v);
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for (int y = 0; y <= rect.height() / 2; ++y) {
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float coeff = static_cast<float>(y) / static_cast<float>(rect.height() / 2); // NOLINT(bugprone-integer-division)
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float coeff2 = 1.0F - ((1.0F - coeff) * (1.0F - coeff));
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coeff = 1.0F - (1.0F - coeff) / 2.0F;
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coeff2 = 1.F - (1.F - coeff2) / 2.0F;
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p->setPen(QColor::fromHsv(h, qBound(0, static_cast<int>(static_cast<float>(s) * coeff), 255), qBound(0, static_cast<int>(255.F - (255.F - static_cast<float>(v)) * coeff2), 255)));
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p->drawPoint(rect.left() + x, rect.top() + y);
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p->drawPoint(rect.left() + x, rect.top() + rect.height() - 1 - y);
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}
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}
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}
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QImage MoodbarRenderer::RenderToImage(const ColorVector &colors, const QSize size) {
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QImage image(size, QImage::Format_ARGB32_Premultiplied);
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QPainter p(&image);
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Render(colors, &p, image.rect());
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p.end();
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return image;
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}
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QString MoodbarRenderer::StyleName(const MoodbarStyle style) {
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switch (style) {
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case MoodbarStyle::Normal:
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return QObject::tr("Normal");
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case MoodbarStyle::Angry:
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return QObject::tr("Angry");
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case MoodbarStyle::Frozen:
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return QObject::tr("Frozen");
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case MoodbarStyle::Happy:
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return QObject::tr("Happy");
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case MoodbarStyle::SystemPalette:
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return QObject::tr("System colors");
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default:
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return QString();
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}
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}
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