1 /****************************************************************************

     2 **

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

     4 ** All rights reserved.

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

     6 **

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

     8 **

     9 ** GNU Lesser General Public License Usage

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

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

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

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

    14 ** Public License version 2.1 requirements will be met:

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

    16 **

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

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

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

    20 **

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

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

    23 **

    24 ****************************************************************************/

    25 

    26 #include "hbvgcolorizeeffect_p.h"

    27 #include "hbvgcolorizeeffect_p_p.h"

    28 #include <QPainter>

    29 

    30 /*!

    31  * \class HbVgColorizeEffect

    32  *

    33  * \brief OpenVG-based colorize filter effect.

    34  *

    35  * \internal

    36  */

    37 

    38 HbVgColorizeEffectPrivate::HbVgColorizeEffectPrivate()

    39     : color(Qt::white)

    40 {

    41 }

    42 

    43 HbVgColorizeEffect::HbVgColorizeEffect(QObject *parent)

    44     : HbVgEffect(*new HbVgColorizeEffectPrivate, parent)

    45 {

    46 }

    47 

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

    49     : HbVgEffect(dd, parent)

    50 {

    51 }

    52 

    53 HbVgColorizeEffect::~HbVgColorizeEffect()

    54 {

    55 }

    56 

    57 QColor HbVgColorizeEffect::color() const

    58 {

    59     Q_D(const HbVgColorizeEffect);

    60     return d->color;

    61 }

    62 

    63 void HbVgColorizeEffect::setColor(const QColor &color)

    64 {

    65     Q_D(HbVgColorizeEffect);

    66     if (d->color == color)

    67         return;

    68     d->color = color;

    69     updateEffect();

    70     emit colorChanged(color);

    71 }

    72 

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

    74 {

    75     return rect;

    76 }

    77 

    78 #ifdef HB_EFFECTS_OPENVG

    79 

    80 const VGfloat Rw = 0.3086f;

    81 const VGfloat Gw = 0.6094f;

    82 const VGfloat Bw = 0.0820f;

    83 

    84 void HbVgColorizeEffectPrivate::getColorMatrix(VGfloat *colorMatrix,

    85                                                const QColor &color,

    86                                                qreal opacity)

    87 {

    88     const VGfloat o = (VGfloat) opacity;

    89     const VGfloat ao = 1 - o;

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

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

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

    93     colorMatrix[0] = R*Rw + ao;

    94     colorMatrix[1] = G*Rw;

    95     colorMatrix[2] = B*Rw;

    96     colorMatrix[3] = 0.0f;

    97     colorMatrix[4] = R*Gw;

    98     colorMatrix[5] = G*Gw + ao;

    99     colorMatrix[6] = B*Gw;

   100     colorMatrix[7] = 0.0f;

   101     colorMatrix[8] = R*Bw;

   102     colorMatrix[9] = G*Bw;

   103     colorMatrix[10] = B*Bw + ao;

   104     colorMatrix[11] = 0.0f;

   105     colorMatrix[12] = 0.0f;

   106     colorMatrix[13] = 0.0f;

   107     colorMatrix[14] = 0.0f;

   108     colorMatrix[15] = 1.0f;

   109     colorMatrix[16] = 0.0f;

   110     colorMatrix[17] = 0.0f;

   111     colorMatrix[18] = 0.0f;

   112     colorMatrix[19] = 0.0f;    

   113 }

   114 

   115 #endif

   116 

   117 void HbVgColorizeEffect::performEffect(QPainter *painter,

   118                                    const QPointF &offset,

   119                                    const QVariant &vgImage,

   120                                    const QSize &vgImageSize)

   121 {

   122 #ifdef HB_EFFECTS_OPENVG

   123     QPixmap cachedPm = cached(vgImageSize);

   124     if (!cachedPm.isNull()) {

   125         painter->drawPixmap(offset, cachedPm);

   126         return;

   127     }

   128 

   129     Q_D(HbVgColorizeEffect);

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

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

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

   133     if (opacity > HBVG_EPSILON) {

   134         if (d->paramsChanged)

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

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

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

   138         tryCache(d->dstPixmap);

   139     } else {

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

   141     }

   142 #else

   143     Q_UNUSED(painter);

   144     Q_UNUSED(offset);

   145     Q_UNUSED(vgImage);

   146     Q_UNUSED(vgImageSize);

   147 #endif

   148 }