New PieceAvailabilityBar.

src/properties/pieceavailabilitybar.cpp

@@ -0,0 +1,225 @@
+/*
+ * Bittorrent Client using Qt4 and libtorrent.
+ * Copyright (C) 2006  Christophe Dumez
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If you
+ * modify file(s), you may extend this exception to your version of the file(s),
+ * but you are not obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * Contact : chris@qbittorrent.org
+ */
+
+#include "pieceavailabilitybar.h"
+
+//#include <QDebug>
+
+PieceAvailabilityBar::PieceAvailabilityBar(QWidget *parent) :
+	QWidget(parent)
+{
+	setFixedHeight(BAR_HEIGHT);
+
+	bg_color = 0xffffff;
+	piece_color = 0x0000ff;
+
+	updatePieceColors();
+}
+
+std::vector<float> PieceAvailabilityBar::intToFloatVector(const std::vector<int> &vecin, int reqSize)
+{
+	std::vector<float> result(reqSize, 0.0);
+
+	if (vecin.size() == 0)
+		return result;
+
+	const float ratio = vecin.size() / (float)reqSize;
+
+	const int maxElement = *std::max_element(vecin.begin(), vecin.end());
+
+	// qMax bacause in normalization we don't want divide by 0
+	// if maxElement == 0 check will be disabled please enable this line:
+	// const int maxElement = qMax(*std::max_element(avail.begin(), avail.end()), 1);
+
+	if (maxElement == 0)
+		return result;
+
+	// simple linear transformation algorithm
+	// for example:
+	// image.x(0) = pieces.x(0.0 >= x < 1.7)
+	// image.x(1) = pieces.x(1.7 >= x < 3.4)
+
+	for (int x = 0; x < reqSize; ++x) {
+
+		// don't use previously calculated value "ratio" here!!!
+		// float cannot save irrational number like 7/9, if this number will be rounded up by std::ceil
+		// give you x2 == pieces.size(), and index out of range: pieces[x2]
+		// this code is safe, so keep that in mind when you try optimize more.
+		// tested with size = 3000000ul
+
+		// R - real
+		const float fromR = (x * vecin.size()) / (float)reqSize;
+		const float toR = ((x + 1) * vecin.size()) / (float)reqSize;
+
+		// C - integer
+		int fromC = fromR;// std::floor not needed
+		int toC = std::ceil(toR);
+
+		// position in pieces table
+		// libtorrent::bitfield::m_size is unsigned int(31 bits), so qlonglong is not needed
+		// tested with size = 3000000ul
+		int x2 = fromC;
+
+		// little speed up for really big pieces table, 10K+ size
+		const int toCMinusOne = toC - 1;
+
+		// value in returned vector
+		float value = 0;
+
+		// case when calculated range is (15.2 >= x < 15.7)
+		if (x2 == toCMinusOne) {
+			if (vecin[x2]) {
+				value += (toR - fromR) * vecin[x2];
+			}
+			++x2;
+		}
+		// case when (15.2 >= x < 17.8)
+		else {
+			// subcase (15.2 >= x < 16)
+			if (x2 != fromR) {
+				if (vecin[x2]) {
+					value += (1.0 - (fromR - fromC)) * vecin[x2];
+				}
+				++x2;
+			}
+
+			// subcase (16 >= x < 17)
+			for (; x2 < toCMinusOne; ++x2) {
+				if (vecin[x2]) {
+					value += vecin[x2];
+				}
+			}
+
+			// subcase (17 >= x < 17.8)
+			if (x2 == toCMinusOne) {
+				if (vecin[x2]) {
+					value += (1.0 - (toC - toR)) * vecin[x2];
+				}
+				++x2;
+			}
+		}
+
+		// normalization <0, 1>
+		value /= ratio * maxElement;
+
+		// float precision sometimes gives > 1, bacause in not possible to store irrational numbers
+		value = qMin(value, (float)1.0);
+
+		result[x] = value;
+	}
+
+	return result;
+}
+
+int PieceAvailabilityBar::mixTwoColors(int &rgb1, int &rgb2, float ratio)
+{
+	int r1 = qRed(rgb1);
+	int g1 = qGreen(rgb1);
+	int b1 = qBlue(rgb1);
+
+	int r2 = qRed(rgb2);
+	int g2 = qGreen(rgb2);
+	int b2 = qBlue(rgb2);
+
+	float ratio_n = 1.0 - ratio;
+	int r = (r1 * ratio_n) + (r2 * ratio);
+	int g = (g1 * ratio_n) + (g2 * ratio);
+	int b = (b1 * ratio_n) + (b2 * ratio);
+
+	return qRgb(r, g, b);
+}
+
+void PieceAvailabilityBar::updateImage()
+{
+//	qDebug() << "updateImageAv";
+	QImage image2(width() - 2, 1, QImage::Format_RGB888);
+
+	if (pieces.empty()) {
+		image2.fill(0xffffff);
+		image = image2;
+		update();
+		return;
+	}
+
+	std::vector<float> scaled_pieces = intToFloatVector(pieces, image2.width());
+
+	// filling image
+	for (unsigned int x = 0; x < scaled_pieces.size(); ++x)
+	{
+		float pieces2_val = scaled_pieces.at(x);
+		image2.setPixel(x, 0, piece_colors[pieces2_val * 255]);
+	}
+	image = image2;
+}
+
+void PieceAvailabilityBar::setAvailability(const std::vector<int>& avail)
+{
+	pieces.assign(avail.begin(), avail.end());
+
+	updateImage();
+	update();
+}
+
+void PieceAvailabilityBar::updatePieceColors()
+{
+	piece_colors = std::vector<int>(256);
+	for (int i = 0; i < 256; ++i) {
+		float ratio = (i / 255.0);
+		piece_colors[i] = mixTwoColors(bg_color, piece_color, ratio);
+	}
+}
+
+void PieceAvailabilityBar::clear()
+{
+	image = QImage();
+	update();
+}
+
+void PieceAvailabilityBar::paintEvent(QPaintEvent *)
+{
+	QPainter painter(this);
+	QRect imageRect(1, 1, width() - 2, height() - 2);
+	if (image.isNull())
+	{
+		painter.setBrush(Qt::white);
+		painter.drawRect(imageRect);
+	}
+	else
+	{
+		if (image.width() != imageRect.width())
+			updateImage();
+		painter.drawImage(imageRect, image);
+	}
+	QPainterPath border;
+	border.addRect(0, 0, width() - 1, height() - 1);
+
+	painter.setPen(palette().color(QPalette::Dark));
+	painter.drawPath(border);
+}

src/properties/pieceavailabilitybar.h

@@ -33,9 +33,7 @@
 
 #include <QWidget>
 #include <QPainter>
-#include <QPixmap>
-#include <QColor>
-#include <numeric>
+#include <QImage>
 #include <cmath>
 #include <algorithm>
 
@@ -46,72 +44,39 @@ class PieceAvailabilityBar: public QWidget {
 	Q_DISABLE_COPY(PieceAvailabilityBar)
 
 private:
-  QPixmap pixmap;
+	QImage image;
 
-public:
-  PieceAvailabilityBar(QWidget *parent): QWidget(parent) {
-    setFixedHeight(BAR_HEIGHT);
-  }
+	// I used values, bacause it should be possible to change colors in runtime
+
+	// background color
+	int bg_color;
+	// complete piece color
+	int piece_color;
+	// buffered 256 levels gradient from bg_color to piece_color
+	std::vector<int> piece_colors;
+
+	// last used int vector, uses to better resize redraw
+	// TODO: make a diff pieces to new pieces and update only changed pixels, speedup when update > 20x faster
+	std::vector<int> pieces;
 
-  void setAvailability(const std::vector<int>& avail) {
-    if(avail.empty()) {
-      // Empty bar
-      QPixmap pix = QPixmap(1, 1);
-      pix.fill();
-      pixmap = pix;
-    } else {
-      // Reduce the number of pieces before creating the pixmap
-      // otherwise it can crash when there are too many pieces
-      const qulonglong nb_pieces = avail.size();
-      const uint w = width();
-      if(nb_pieces > w) {
-        const qulonglong ratio = floor(nb_pieces/(double)w);
-        std::vector<int> scaled_avail;
-        scaled_avail.reserve(ceil(nb_pieces/(double)ratio));
-        for(qulonglong i=0; i<nb_pieces; i+= ratio) {
-          // XXX: Do not compute the average to save cpu
-          scaled_avail.push_back(avail[i]);
-        }
-        updatePixmap(scaled_avail);
-      } else {
-        updatePixmap(avail);
-      }
-    }
+	// scale int vector to float vector
+	std::vector<float> intToFloatVector(const std::vector<int> &vecin, int reqSize);
 
-    update();
-  }
+	// mix two colors by light model, ratio <0, 1>
+	int mixTwoColors(int &rgb1, int &rgb2, float ratio);
+	// draw new image and replace actual image
+	void updateImage();
 
-  void clear() {
-    pixmap = QPixmap();
-    update();
-  }
+public:
+	PieceAvailabilityBar(QWidget *parent);
+
+	void setAvailability(const std::vector<int>& avail);
+	void updatePieceColors();
+	void clear();
 
 protected:
-  void paintEvent(QPaintEvent *) {
-    if(pixmap.isNull()) return;
-    QPainter painter(this);
-    painter.drawPixmap(rect(), pixmap);
-  }
+	void paintEvent(QPaintEvent *);
 
-private:
-  void updatePixmap(const std::vector<int> avail) {
-    const int max = *std::max_element(avail.begin(), avail.end());
-    if(max == 0) {
-      QPixmap pix = QPixmap(1, 1);
-      pix.fill();
-      pixmap = pix;
-      return;
-    }
-    QPixmap pix = QPixmap(avail.size(), 1);
-    //pix.fill();
-    QPainter painter(&pix);
-    for(uint i=0; i < avail.size(); ++i) {
-      const uint rg = 0xff - (0xff * avail[i]/max);
-      painter.setPen(QColor(rg, rg, 0xff));
-      painter.drawPoint(i,0);
-    }
-    pixmap = pix;
-  }
 };
 
 #endif // PIECEAVAILABILITYBAR_H

src/properties/properties.pri

@@ -19,4 +19,5 @@ SOURCES += $$PWD/propertieswidget.cpp \
              $$PWD/peerlistwidget.cpp \
              $$PWD/trackerlist.cpp \
              $$PWD/proptabbar.cpp \
-    properties/downloadedpiecesbar.cpp
+    properties/downloadedpiecesbar.cpp \
+    properties/pieceavailabilitybar.cpp