src/gui/properties/pieceavailabilitybar.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2024  Vladimir Golovnev <glassez@yandex.ru>
   4  * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * In addition, as a special exception, the copyright holders give permission to
  21  * link this program with the OpenSSL project's "OpenSSL" library (or with
  22  * modified versions of it that use the same license as the "OpenSSL" library),
  23  * and distribute the linked executables. You must obey the GNU General Public
  24  * License in all respects for all of the code used other than "OpenSSL".  If you
  25  * modify file(s), you may extend this exception to your version of the file(s),
  26  * but you are not obligated to do so. If you do not wish to do so, delete this
  27  * exception statement from your version.
  28  */
  29
  30 #include "pieceavailabilitybar.h"
  31
  32 #include <algorithm>
  33 #include <cmath>
  34
  35 #include <QDebug>
  36
  37 #include "base/global.h"
  38
  39 PieceAvailabilityBar::PieceAvailabilityBar(QWidget *parent)
  40     : base {parent}
  41 {
  42 }
  43
  44 QList<float> PieceAvailabilityBar::intToFloatVector(const QList<int> &vecin, int reqSize)
  45 {
  46     QList<float> result(reqSize, 0.0);
  47     if (vecin.isEmpty()) return result;
  48
  49     const float ratio = static_cast<float>(vecin.size()) / reqSize;
  50
  51     const int maxElement = *std::max_element(vecin.begin(), vecin.end());
  52
  53     // std::max because in normalization we don't want divide by 0
  54     // if maxElement == 0 check will be disabled please enable this line:
  55     // const int maxElement = std::max(*std::max_element(avail.begin(), avail.end()), 1);
  56
  57     if (maxElement == 0)
  58         return result;
  59
  60     // simple linear transformation algorithm
  61     // for example:
  62     // image.x(0) = pieces.x(0.0 >= x < 1.7)
  63     // image.x(1) = pieces.x(1.7 >= x < 3.4)
  64
  65     for (int x = 0; x < reqSize; ++x)
  66     {
  67         // R - real
  68         const float fromR = x * ratio;
  69         const float toR = (x + 1) * ratio;
  70
  71         // C - integer
  72         int fromC = fromR;// std::floor not needed
  73         int toC = std::ceil(toR);
  74         if (toC > vecin.size())
  75             --toC;
  76
  77         // position in pieces table
  78         int x2 = fromC;
  79
  80         // little speed up for really big pieces table, 10K+ size
  81         const int toCMinusOne = toC - 1;
  82
  83         // value in returned vector
  84         float value = 0;
  85
  86         // case when calculated range is (15.2 >= x < 15.7)
  87         if (x2 == toCMinusOne)
  88         {
  89             if (vecin[x2])
  90                 value += ratio * vecin[x2];
  91             ++x2;
  92         }
  93         // case when (15.2 >= x < 17.8)
  94         else
  95         {
  96             // subcase (15.2 >= x < 16)
  97             if (x2 != fromR)
  98             {
  99                 if (vecin[x2])
 100                     value += (1.0 - (fromR - fromC)) * vecin[x2];
 101                 ++x2;
 102             }
 103
 104             // subcase (16 >= x < 17)
 105             for (; x2 < toCMinusOne; ++x2)
 106                 if (vecin[x2])
 107                     value += vecin[x2];
 108
 109             // subcase (17 >= x < 17.8)
 110             if (x2 == toCMinusOne)
 111             {
 112                 if (vecin[x2])
 113                     value += (1.0 - (toC - toR)) * vecin[x2];
 114                 ++x2;
 115             }
 116         }
 117
 118         // normalization <0, 1>
 119         value /= ratio * maxElement;
 120
 121         // float precision sometimes gives > 1, because it's not possible to store irrational numbers
 122         value = std::min(value, 1.0f);
 123
 124         result[x] = value;
 125     }
 126
 127     return result;
 128 }
 129
 130 QImage PieceAvailabilityBar::renderImage()
 131 {
 132     QImage image {width() - 2 * borderWidth, 1, QImage::Format_RGB888};
 133     if (image.isNull())
 134     {
 135         qDebug() << "QImage allocation failed, width():" << width();
 136         return image;
 137     }
 138
 139     if (m_pieces.empty())
 140     {
 141         image.fill(backgroundColor());
 142         return image;
 143     }
 144
 145     QList<float> scaledPieces = intToFloatVector(m_pieces, image.width());
 146
 147     // filling image
 148     for (int x = 0; x < scaledPieces.size(); ++x)
 149     {
 150         float piecesToValue = scaledPieces.at(x);
 151         image.setPixel(x, 0, pieceColors()[piecesToValue * 255]);
 152     }
 153
 154     return image;
 155 }
 156
 157 void PieceAvailabilityBar::setAvailability(const QList<int> &avail)
 158 {
 159     m_pieces = avail;
 160
 161     redraw();
 162 }
 163
 164 void PieceAvailabilityBar::clear()
 165 {
 166     m_pieces.clear();
 167     base::clear();
 168 }
 169
 170 QString PieceAvailabilityBar::simpleToolTipText() const
 171 {
 172     const QString borderColor = colorBoxBorderColor().name();
 173     const QString rowHTML = u"<tr><td width=20 bgcolor='%1' style='border: 1px solid \"%2\";'></td><td>%3</td></tr>"_s;
 174     return u"<table cellspacing=4>"
 175            + rowHTML.arg(backgroundColor().name(), borderColor, tr("Unavailable pieces"))
 176            + rowHTML.arg(pieceColor().name(), borderColor, tr("Available pieces"))
 177            + u"</table>";
 178
 179 }