LibrePilot/ground/src/plugins/coreplugin/styleanimator.cpp

/**
 ******************************************************************************
 *
 * @file       styleanimator.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
 * @addtogroup GCSPlugins GCS Plugins
 * @{
 * @addtogroup CorePlugin Core Plugin
 * @{
 * @brief The Core GCS plugin
 *****************************************************************************/
/*
 * 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 3 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., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "styleanimator.h"

#include <QtGui/QStyleOption>

Animation * StyleAnimator::widgetAnimation(const QWidget *widget) const
{
    if (!widget)
        return 0;
    foreach (Animation *a, animations) {
        if (a->widget() == widget)
            return a;
    }
    return 0;
}

void Animation::paint(QPainter *painter, const QStyleOption *option)
{
    Q_UNUSED(option)
    Q_UNUSED(painter)
}

void Animation::drawBlendedImage(QPainter *painter, QRect rect, float alpha)
{
    if (m_secondaryImage.isNull() || m_primaryImage.isNull())
        return;

    if (m_tempImage.isNull())
        m_tempImage = m_secondaryImage;

    const int a = qRound(alpha*256);
    const int ia = 256 - a;
    const int sw = m_primaryImage.width();
    const int sh = m_primaryImage.height();
    const int bpl = m_primaryImage.bytesPerLine();
    switch (m_primaryImage.depth()) {
    case 32:
        {
            uchar *mixed_data = m_tempImage.bits();
            const uchar *back_data = m_primaryImage.bits();
            const uchar *front_data = m_secondaryImage.bits();
            for (int sy = 0; sy < sh; sy++) {
                quint32 *mixed = (quint32*)mixed_data;
                const quint32* back = (const quint32*)back_data;
                const quint32* front = (const quint32*)front_data;
                for (int sx = 0; sx < sw; sx++) {
                    quint32 bp = back[sx];
                    quint32 fp = front[sx];
                    mixed[sx] =  qRgba ((qRed(bp)*ia + qRed(fp)*a)>>8,
                                        (qGreen(bp)*ia + qGreen(fp)*a)>>8,
                                        (qBlue(bp)*ia + qBlue(fp)*a)>>8,
                                        (qAlpha(bp)*ia + qAlpha(fp)*a)>>8);
                }
                mixed_data += bpl;
                back_data += bpl;
                front_data += bpl;
            }
        }
    default:
        break;
    }
    painter->drawImage(rect, m_tempImage);
}

void Transition::paint(QPainter *painter, const QStyleOption *option)
{
    float alpha = 1.0;
    if (m_duration > 0) {
        QTime current = QTime::currentTime();

        if (m_startTime > current)
            m_startTime = current;

        int timeDiff = m_startTime.msecsTo(current);
        alpha = timeDiff/(float)m_duration;
        if (timeDiff > m_duration) {
            m_running = false;
            alpha = 1.0;
        }
    }
    else {
        m_running = false;
    }
    drawBlendedImage(painter, option->rect, alpha);
}

void StyleAnimator::timerEvent(QTimerEvent *)
{
    for (int i = animations.size() - 1 ; i >= 0 ; --i) {
        if (animations[i]->widget())
            animations[i]->widget()->update();

        if (!animations[i]->widget() ||
            !animations[i]->widget()->isEnabled() ||
            !animations[i]->widget()->isVisible() ||
            animations[i]->widget()->window()->isMinimized() ||
            !animations[i]->running())
        {
            Animation *a = animations.takeAt(i);
            delete a;
        }
    }
    if (animations.size() == 0 && animationTimer.isActive()) {
        animationTimer.stop();
    }
}

void StyleAnimator::stopAnimation(const QWidget *w)
{
    for (int i = animations.size() - 1 ; i >= 0 ; --i) {
        if (animations[i]->widget() == w) {
            Animation *a = animations.takeAt(i);
            delete a;
            break;
        }
    }
}

void StyleAnimator::startAnimation(Animation *t)
{
    stopAnimation(t->widget());
    animations.append(t);
    if (animations.size() > 0 && !animationTimer.isActive()) {
        animationTimer.start(35, this);
    }
}