qBittorrent/src/properties/pieceavailabilitybar.h

/*
 * 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
 */

#ifndef PIECEAVAILABILITYBAR_H
#define PIECEAVAILABILITYBAR_H

#include <QWidget>
#include <QPainter>
#include <QImage>
#include <cmath>
#include <algorithm>

#define BAR_HEIGHT 18

class PieceAvailabilityBar: public QWidget {
	Q_OBJECT
	Q_DISABLE_COPY(PieceAvailabilityBar)

private:
	QImage image;

	// 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;

	// scale int vector to float vector
	std::vector<float> intToFloatVector(const std::vector<int> &vecin, int reqSize);

	// 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();

public:
	PieceAvailabilityBar(QWidget *parent);

	void setAvailability(const std::vector<int>& avail);
	void updatePieceColors();
	void clear();

protected:
	void paintEvent(QPaintEvent *);

};

#endif // PIECEAVAILABILITYBAR_H