/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbvgcolorizeeffect_p.h"

#include "hbvgcolorizeeffect_p_p.h"

#include <QPainter>

/*!

 * \class HbVgColorizeEffect

 *

 * \brief OpenVG-based colorize filter effect.

 *

 * \internal

 */

HbVgColorizeEffectPrivate::HbVgColorizeEffectPrivate()

    : color(Qt::white)

{

}

HbVgColorizeEffect::HbVgColorizeEffect(QObject *parent)

    : HbVgEffect(*new HbVgColorizeEffectPrivate, parent)

{

}

HbVgColorizeEffect::HbVgColorizeEffect(HbVgColorizeEffectPrivate &dd, QObject *parent)

    : HbVgEffect(dd, parent)

{

}

HbVgColorizeEffect::~HbVgColorizeEffect()

{

}

QColor HbVgColorizeEffect::color() const

{

    Q_D(const HbVgColorizeEffect);

    return d->color;

}

void HbVgColorizeEffect::setColor(const QColor &color)

{

    Q_D(HbVgColorizeEffect);

    if (d->color == color)

        return;

    d->color = color;

    updateEffect();

    emit colorChanged(color);

}

QRectF HbVgColorizeEffect::boundingRectFor(const QRectF &rect) const

{

    return rect;

}

#ifdef HB_EFFECTS_OPENVG

const VGfloat Rw = 0.3086f;

const VGfloat Gw = 0.6094f;

const VGfloat Bw = 0.0820f;

void HbVgColorizeEffectPrivate::getColorMatrix(VGfloat *colorMatrix,

                                               const QColor &color,

                                               qreal opacity)

{

    const VGfloat o = (VGfloat) opacity;

    const VGfloat ao = 1 - o;

    const VGfloat R = (o / 255.0f) * (VGfloat) color.red();

    const VGfloat G = (o / 255.0f) * (VGfloat) color.green();

    const VGfloat B = (o / 255.0f) * (VGfloat) color.blue();

    colorMatrix[0] = R*Rw + ao;

    colorMatrix[1] = G*Rw;

    colorMatrix[2] = B*Rw;

    colorMatrix[3] = 0.0f;

    colorMatrix[4] = R*Gw;

    colorMatrix[5] = G*Gw + ao;

    colorMatrix[6] = B*Gw;

    colorMatrix[7] = 0.0f;

    colorMatrix[8] = R*Bw;

    colorMatrix[9] = G*Bw;

    colorMatrix[10] = B*Bw + ao;

    colorMatrix[11] = 0.0f;

    colorMatrix[12] = 0.0f;

    colorMatrix[13] = 0.0f;

    colorMatrix[14] = 0.0f;

    colorMatrix[15] = 1.0f;

    colorMatrix[16] = 0.0f;

    colorMatrix[17] = 0.0f;

    colorMatrix[18] = 0.0f;

    colorMatrix[19] = 0.0f;    

}

#endif

void HbVgColorizeEffect::performEffect(QPainter *painter,

                                   const QPointF &offset,

                                   const QVariant &vgImage,

                                   const QSize &vgImageSize)

{

#ifdef HB_EFFECTS_OPENVG

    QPixmap cachedPm = cached(vgImageSize);

    if (!cachedPm.isNull()) {

        painter->drawPixmap(offset, cachedPm);

        return;

    }

    Q_D(HbVgColorizeEffect);

    VGImage srcImage = vgImage.value<VGImage>();

    VGImage dstImage = d->ensurePixmap(&d->dstPixmap, vgImageSize);

    qreal opacity = clamp(d->opacity, 0.0f, 1.0f);

    if (opacity > HBVG_EPSILON) {

        if (d->paramsChanged)

            HbVgColorizeEffectPrivate::getColorMatrix(d->colorMatrix, d->color, opacity);

        vgColorMatrix(dstImage, srcImage, d->colorMatrix);

        painter->drawPixmap(offset, d->dstPixmap);

        tryCache(d->dstPixmap);

    } else {

        painter->drawPixmap(offset, d->srcPixmap);

    }

#else

    Q_UNUSED(painter);

    Q_UNUSED(offset);

    Q_UNUSED(vgImage);

    Q_UNUSED(vgImageSize);

#endif

}