src/hbcore/ovgeffects/hbvgoutlineeffect.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 11 Jun 2010 13:58:22 +0300
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permissions -rw-r--r--
Revision: 201021 Kit: 2010123
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbCore module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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#include "hbvgoutlineeffect_p.h"
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#include "hbvgoutlineeffect_p_p.h"
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#include <QPainter>
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/*!
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 * \class HbVgOutlineEffect
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 *
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 * \brief OpenVG-based outline filter effect.
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 *
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 * \internal
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 */
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HbVgOutlineEffectPrivate::HbVgOutlineEffectPrivate()
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    : outline(1, 1), color(Qt::black), steepness(20), offset(0, 0)
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{
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}
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HbVgOutlineEffect::HbVgOutlineEffect(QObject *parent)
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    : HbVgEffect(*new HbVgOutlineEffectPrivate, parent)
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{
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}
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HbVgOutlineEffect::HbVgOutlineEffect(HbVgOutlineEffectPrivate &dd, QObject *parent)
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    : HbVgEffect(dd, parent)
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{
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}
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HbVgOutlineEffect::~HbVgOutlineEffect()
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{
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}
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QPointF HbVgOutlineEffect::outline() const
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{
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    Q_D(const HbVgOutlineEffect);
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    return d->outline;
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}
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void HbVgOutlineEffect::setOutline(const QPointF &outline)
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{
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    Q_D(HbVgOutlineEffect);
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    if (d->outline == outline) {
0
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        return;
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    }
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    d->outline = outline;
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    updateEffectBoundingRect();
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    emit outlineChanged(outline);
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}
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QColor HbVgOutlineEffect::color() const
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{
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    Q_D(const HbVgOutlineEffect);
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    return d->color;
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}
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void HbVgOutlineEffect::setColor(const QColor &color)
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{
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    Q_D(HbVgOutlineEffect);
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    if (d->color == color) {
0
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        return;
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    }
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    d->color = color;
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    updateEffect();
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    emit colorChanged(color);
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}
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qreal HbVgOutlineEffect::steepness() const
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{
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    Q_D(const HbVgOutlineEffect);
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    return d->steepness;
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}
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void HbVgOutlineEffect::setSteepness(qreal steepness)
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{
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    Q_D(HbVgOutlineEffect);
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    if (d->steepness == steepness) {
0
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        return;
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    }
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    d->steepness = steepness;
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    updateEffect();
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    emit steepnessChanged(steepness);
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}
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QPointF HbVgOutlineEffect::offset() const
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{
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    Q_D(const HbVgOutlineEffect);
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    return d->offset;
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}
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void HbVgOutlineEffect::setOffset(const QPointF &offset)
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{
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    Q_D(HbVgOutlineEffect);
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    if (d->offset == offset) {
0
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        return;
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    }
0
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    d->offset = offset;
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    updateEffectBoundingRect();
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    emit offsetChanged(offset);
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}
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   124
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QRectF HbVgOutlineEffect::boundingRectFor(const QRectF &rect) const
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{
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    Q_D(const HbVgOutlineEffect);
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    QSizeF mappedOutline = d->mapSize(QSizeF(d->outline.x(), d->outline.y()));
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    QPointF mappedOffset = d->mapOffset(d->offset);
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    qreal ox1 = rect.left() - mappedOutline.width() + mappedOffset.x();
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    qreal oy1 = rect.top() - mappedOutline.height() + mappedOffset.y();
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    qreal ox2 = rect.right() + mappedOutline.width() + mappedOffset.x();
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    qreal oy2 = rect.bottom() + mappedOutline.height() + mappedOffset.y();
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    qreal x1 = qMin(rect.left(), ox1);
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    qreal y1 = qMin(rect.top(), oy1);
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    qreal x2 = qMax(rect.right(), ox2);
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    qreal y2 = qMax(rect.bottom(), oy2);
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    return QRectF(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
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}
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   143
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QPixmap HbVgOutlineEffect::makeOutline(const QVariant &vgImage, const QSize &vgImageSize)
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{
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#ifdef HB_EFFECTS_OPENVG
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    QPixmap cachedPm = cached(vgImageSize);
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    if (!cachedPm.isNull()) {
0
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        return cachedPm;
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    }
0
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    Q_D(HbVgOutlineEffect);
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    VGImage srcImage = vgImage.value<VGImage>();
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    VGImage dstImage = d->ensurePixmap(&d->dstPixmap, vgImageSize);
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    if (d->paramsChanged) {
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        VGubyte stpc = (VGubyte) clamp(d->steepness, 0.0f, 32.0f);
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        VGubyte unnormalisedOpacity = (VGubyte)(clamp(d->opacity, 0.0f, 1.0f) * 255.0f);
0
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        for (int i = 0; i < 256; ++i) {
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            VGubyte alpha = (i * stpc > unnormalisedOpacity) ? unnormalisedOpacity : i * stpc;
0
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            d->lut[i] = 0x00000000
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                        | (d->color.red() << 24)
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                        | (d->color.green() << 16)
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                        | (d->color.blue() << 8)
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                        | alpha;
0
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        }
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    }
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    QSizeF mappedOutline = d->mapSize(QSizeF(d->outline.x(), d->outline.y()));
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    VGfloat outline_x = (VGfloat) clamp(mappedOutline.width(), HBVG_EPSILON, 16.0f);
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    VGfloat outline_y = (VGfloat) clamp(mappedOutline.height(), HBVG_EPSILON, 16.0f);
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    if (outline_x > HBVG_EPSILON && outline_y > HBVG_EPSILON) {
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        VGImage tmpImage = d->ensurePixmap(&d->tmpPixmap, vgImageSize);
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        vgGaussianBlur(tmpImage, srcImage, outline_x, outline_y, VG_TILE_PAD);
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        vgLookupSingle(dstImage, tmpImage, d->lut, VG_ALPHA, VG_TRUE, VG_FALSE);
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    } else {
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        vgCopyImage(dstImage, 0, 0, srcImage, 0, 0,
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                    vgImageSize.width(), vgImageSize.height(), VG_FALSE);
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    }
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    tryCache(d->dstPixmap);
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    return d->dstPixmap;
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#else
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    Q_UNUSED(vgImage);
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    Q_UNUSED(vgImageSize);
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    return QPixmap();
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#endif
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}
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void HbVgOutlineEffect::performEffect(QPainter *painter,
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                                      const QPointF &offset,
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                                      const QVariant &vgImage,
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                                      const QSize &vgImageSize)
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{
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#ifdef HB_EFFECTS_OPENVG
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    Q_D(HbVgOutlineEffect);
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    QPixmap outlinePm = makeOutline(vgImage, vgImageSize);
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    painter->drawPixmap(offset, outlinePm);
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    painter->drawPixmap(offset, d->srcPixmap);
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#else
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    Q_UNUSED(painter);
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    Q_UNUSED(offset);
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    Q_UNUSED(vgImage);
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    Q_UNUSED(vgImageSize);
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#endif
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}