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

**

** 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 "hbvgoutlineeffect_p.h"

#include "hbvgoutlineeffect_p_p.h"

#include <QPainter>

/*!

 * \class HbVgOutlineEffect

 *

 * \brief OpenVG-based outline filter effect.

 *

 * \internal

 */

HbVgOutlineEffectPrivate::HbVgOutlineEffectPrivate()

    : outline(1, 1), color(Qt::black), steepness(20), offset(0, 0)

{

}

HbVgOutlineEffect::HbVgOutlineEffect(QObject *parent)

    : HbVgEffect(*new HbVgOutlineEffectPrivate, parent)

{

}

HbVgOutlineEffect::HbVgOutlineEffect(HbVgOutlineEffectPrivate &dd, QObject *parent)

    : HbVgEffect(dd, parent)

{

}

HbVgOutlineEffect::~HbVgOutlineEffect()

{

}

QPointF HbVgOutlineEffect::outline() const

{

    Q_D(const HbVgOutlineEffect);

    return d->outline;

}

void HbVgOutlineEffect::setOutline(const QPointF &outline)

{

    Q_D(HbVgOutlineEffect);

    if (d->outline == outline) {

        return;

    }

    d->outline = outline;

    updateEffectBoundingRect();

    emit outlineChanged(outline);

}

QColor HbVgOutlineEffect::color() const

{

    Q_D(const HbVgOutlineEffect);

    return d->color;

}

void HbVgOutlineEffect::setColor(const QColor &color)

{

    Q_D(HbVgOutlineEffect);

    if (d->color == color) {

        return;

    }

    d->color = color;

    updateEffect();

    emit colorChanged(color);

}

qreal HbVgOutlineEffect::steepness() const

{

    Q_D(const HbVgOutlineEffect);

    return d->steepness;

}

void HbVgOutlineEffect::setSteepness(qreal steepness)

{

    Q_D(HbVgOutlineEffect);

    if (d->steepness == steepness) {

        return;

    }

    d->steepness = steepness;

    updateEffect();

    emit steepnessChanged(steepness);

}

QPointF HbVgOutlineEffect::offset() const

{

    Q_D(const HbVgOutlineEffect);

    return d->offset;

}

void HbVgOutlineEffect::setOffset(const QPointF &offset)

{

    Q_D(HbVgOutlineEffect);

    if (d->offset == offset) {

        return;

    }

    d->offset = offset;

    updateEffectBoundingRect();

    emit offsetChanged(offset);

}

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

{

    Q_D(const HbVgOutlineEffect);

    QPointF mappedOffset = d->mapOffset(d->offset);

    qreal ox1 = rect.left() - mappedOutline.width() + mappedOffset.x();

    qreal oy1 = rect.top() - mappedOutline.height() + mappedOffset.y();

    qreal ox2 = rect.right() + mappedOutline.width() + mappedOffset.x();

    qreal oy2 = rect.bottom() + mappedOutline.height() + mappedOffset.y();

    qreal x1 = qMin(rect.left(), ox1);

    qreal y1 = qMin(rect.top(), oy1);

    qreal x2 = qMax(rect.right(), ox2);

    qreal y2 = qMax(rect.bottom(), oy2);

    return QRectF(x1, y1, x2 - x1 + 1, y2 - y1 + 1);

}

QPixmap HbVgOutlineEffect::makeOutline(const QVariant &vgImage, const QSize &vgImageSize)

{

#ifdef HB_EFFECTS_OPENVG

    QPixmap cachedPm = cached(vgImageSize);

    if (!cachedPm.isNull()) {

        return cachedPm;

    }

    Q_D(HbVgOutlineEffect);

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

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

    if (d->paramsChanged) {

        VGubyte stpc = (VGubyte) clamp(d->steepness, 0.0f, 255.0f);

        VGubyte unnormalisedOpacity = (VGubyte)(clamp(d->opacity, 0.0f, 1.0f) * 255.0f);

        for (int i = 0; i < 256; ++i) {

            VGubyte alpha = (i * stpc > unnormalisedOpacity) ? unnormalisedOpacity : i * stpc;

            d->lut[i] = 0x00000000

                        | (d->color.red() << 24)

                        | (d->color.green() << 16)

                        | (d->color.blue() << 8)

                        | alpha;

        }

    }

    QSizeF mappedOutline = d->mapSize(QSizeF(d->outline.x(), d->outline.y()));

    VGfloat outline_x = (VGfloat) clamp(mappedOutline.width(), HBVG_EPSILON, 16.0f);

    VGfloat outline_y = (VGfloat) clamp(mappedOutline.height(), HBVG_EPSILON, 16.0f);

    if (outline_x > HBVG_EPSILON && outline_y > HBVG_EPSILON) {

        VGImage tmpImage = d->ensurePixmap(&d->tmpPixmap, vgImageSize);

        vgGaussianBlur(tmpImage, srcImage, outline_x, outline_y, VG_TILE_PAD);

        vgLookupSingle(dstImage, tmpImage, d->lut, VG_ALPHA, VG_TRUE, VG_FALSE);

    } else {

        vgCopyImage(dstImage, 0, 0, srcImage, 0, 0,

                    vgImageSize.width(), vgImageSize.height(), VG_FALSE);

    }

    tryCache(d->dstPixmap);

    return d->dstPixmap;

#else

    Q_UNUSED(vgImage);

    Q_UNUSED(vgImageSize);

    return QPixmap();

#endif

}

void HbVgOutlineEffect::performEffect(QPainter *painter,

                                      const QPointF &offset,

                                      const QVariant &vgImage,

                                      const QSize &vgImageSize)

{

#ifdef HB_EFFECTS_OPENVG

    Q_D(HbVgOutlineEffect);

    QPixmap outlinePm = makeOutline(vgImage, vgImageSize);

    painter->drawPixmap(offset, outlinePm);

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

#else

    Q_UNUSED(painter);

    Q_UNUSED(offset);

    Q_UNUSED(vgImage);

    Q_UNUSED(vgImageSize);

#endif

}