Clementine-audio-player-Mac.../src/moodbar/moodbarrenderer.cpp

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/* This file is part of Clementine.
Copyright 2012, David Sansome <me@davidsansome.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 "moodbarrenderer.h"
#include <QPainter>
#include <QPalette>
const int MoodbarRenderer::kNumHues = 12;
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ColorVector MoodbarRenderer::Colors(
const QByteArray& data, MoodbarStyle style, const QPalette& palette) {
const int samples = data.size() / 3;
// Set some parameters based on the moodbar style
StyleProperties properties;
switch(style) {
case Style_Angry: properties = StyleProperties(samples / 360 * 9, 45, -45, 200, 100); break;
case Style_Frozen: properties = StyleProperties(samples / 360 * 1, 140, 160, 50, 100); break;
case Style_Happy: properties = StyleProperties(samples / 360 * 2, 0, 359, 150, 250); break;
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case Style_Normal: properties = StyleProperties(samples / 360 * 3, 0, 359, 100, 100); break;
case Style_SystemPalette:
default: {
const QColor highlight_color(palette.color(QPalette::Active, QPalette::Highlight));
properties.threshold_ = samples / 360 * 3;
properties.range_start_ = (highlight_color.hsvHue() - 20 + 360) % 360;
properties.range_delta_ = 20;
properties.sat_ = highlight_color.hsvSaturation();
properties.val_ = highlight_color.value() / 2;
}
}
const unsigned char* data_p =
reinterpret_cast<const unsigned char*>(data.constData());
int hue_distribution[360];
int total = 0;
memset(hue_distribution, 0, sizeof(hue_distribution));
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ColorVector colors;
// Read the colors, keeping track of some histograms
for (int i=0; i<samples; ++i) {
QColor color;
color.setRed(int(*data_p++));
color.setGreen(int(*data_p++));
color.setBlue(int(*data_p++));
colors << color;
const int hue = qMax(0, color.hue());
if (hue_distribution[hue]++ == properties.threshold_) {
total ++;
}
}
total = qMax(total, 1);
// Remap the hue values to be between rangeStart and
// rangeStart + rangeDelta. Every time we see an input hue
// above the threshold, increment the output hue by
// (1/total) * rangeDelta.
for (int i=0, n=0 ; i<360; i++) {
hue_distribution[i] =
((hue_distribution[i] > properties.threshold_ ? n++ : n )
* properties.range_delta_ / total + properties.range_start_) % 360;
}
// Now huedist is a hue mapper: huedist[h] is the new hue value
// for a bar with hue h
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for (ColorVector::iterator it = colors.begin() ; it != colors.end() ; ++it) {
const int hue = qMax(0, it->hue());
*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));
}
return colors;
}
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void MoodbarRenderer::Render(const ColorVector& colors, QPainter* p, const QRect& rect) {
// Sample the colors and map them to screen pixels.
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ColorVector screen_colors;
for (int x=0; x<rect.width(); ++x) {
int r = 0;
int g = 0;
int b = 0;
uint start = x * colors.size() / rect.width();
uint end = (x + 1) * colors.size() / rect.width();
if (start == end)
end = start + 1;
for (uint j=start; j<end; j++) {
r += colors[j].red();
g += colors[j].green();
b += colors[j].blue();
}
const uint n = end - start;
screen_colors.append(QColor(r/n, g/n, b/n));
}
// Draw the actual moodbar.
for (int x=0; x<rect.width(); x++) {
int h, s, v;
screen_colors[x].getHsv( &h, &s, &v );
for (int y=0; y<=rect.height()/2; y++) {
float coeff = float(y) / float(rect.height()/2);
float coeff2 = 1.0f - ((1.0f - coeff) * (1.0f - coeff));
coeff = 1.0f - (1.0f - coeff) / 2.0f;
coeff2 = 1.f - (1.f - coeff2) / 2.0f;
p->setPen(QColor::fromHsv(
h,
qBound(0, int(float(s) * coeff), 255),
qBound(0, int(255.f - (255.f - float(v)) * coeff2), 255)));
p->drawPoint(rect.left() + x, rect.top() + y);
p->drawPoint(rect.left() + x, rect.top() + rect.height() - 1 - y);
}
}
}
QImage MoodbarRenderer::RenderToImage(const ColorVector& colors, const QSize& size) {
QImage image(size, QImage::Format_ARGB32_Premultiplied);
QPainter p(&image);
Render(colors, &p, image.rect());
p.end();
return image;
}
QString MoodbarRenderer::StyleName(MoodbarStyle style) {
switch (style) {
case Style_Normal: return QObject::tr("Normal");
case Style_Angry: return QObject::tr("Angry");
case Style_Frozen: return QObject::tr("Frozen");
case Style_Happy: return QObject::tr("Happy");
case Style_SystemPalette: return QObject::tr("System colors");
default: return QString();
}
}