--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hbcore/ovgeffects/hbvgbceffect.cpp	Mon Apr 19 14:02:13 2010 +0300
@@ -0,0 +1,162 @@
+/****************************************************************************
+**
+** 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 "hbvgbceffect_p.h"
+#include "hbvgbceffect_p_p.h"
+#include <QPainter>
+
+/*!
+ * \class HbVgBcEffect
+ *
+ * \brief OpenVG-based brightness-contrast filter effect.
+ *
+ * \internal
+ */
+
+HbVgBcEffectPrivate::HbVgBcEffectPrivate()
+    : brightness(0), contrast(1)
+{
+}
+
+HbVgBcEffect::HbVgBcEffect(QObject *parent)
+    : HbVgEffect(*new HbVgBcEffectPrivate, parent)
+{
+}
+
+HbVgBcEffect::HbVgBcEffect(HbVgBcEffectPrivate &dd, QObject *parent)
+    : HbVgEffect(dd, parent)
+{
+}
+
+HbVgBcEffect::~HbVgBcEffect()
+{
+}
+
+qreal HbVgBcEffect::brightness() const
+{
+    Q_D(const HbVgBcEffect);
+    return d->brightness;
+}
+
+void HbVgBcEffect::setBrightness(qreal brightness)
+{
+    Q_D(HbVgBcEffect);
+    if (d->brightness == brightness)
+        return;
+    d->brightness = brightness;
+    updateEffect();
+    emit brightnessChanged(brightness);
+}
+
+qreal HbVgBcEffect::contrast() const
+{
+    Q_D(const HbVgBcEffect);
+    return d->contrast;
+}
+
+void HbVgBcEffect::setContrast(qreal contrast)
+{
+    Q_D(HbVgBcEffect);
+    if (d->contrast == contrast)
+        return;
+    d->contrast = contrast;
+    updateEffect();
+    emit contrastChanged(contrast);
+}
+
+QRectF HbVgBcEffect::boundingRectFor(const QRectF &rect) const
+{
+    return rect;
+}
+
+void HbVgBcEffect::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(HbVgBcEffect);
+    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) {
+            // brightness [-1, 1]
+            const VGfloat offset_br = clamp(d->brightness, -1.0f, 1.0f);
+            const VGfloat scale_br = 1.0f - 0.5f * ((offset_br < 0.0f) ? -offset_br : offset_br);
+    
+            // contrast [0, N]
+            const VGfloat scale_con = clamp(d->contrast, 0.0f, 100.0f);
+            const VGfloat offset_con = -0.5f * scale_con + 0.5f ;
+    
+            // combine the effects of brightness and contrast
+            const VGfloat off = offset_br + offset_con;
+            const VGfloat sc  = scale_br * scale_con;
+
+            // take opacity into account
+            const VGfloat o = (VGfloat) opacity;
+            const VGfloat oOff = off * o;
+            const VGfloat oSc  = (sc * o) + (1.0f - o);
+    
+            d->colorMatrix[0] = oSc;
+            d->colorMatrix[1] = 0.0f;
+            d->colorMatrix[2] = 0.0f;
+            d->colorMatrix[3] = 0.0f;
+            d->colorMatrix[4] = 0.0f;
+            d->colorMatrix[5] = oSc;
+            d->colorMatrix[6] = 0.0f;
+            d->colorMatrix[7] = 0.0f;
+            d->colorMatrix[8] = 0.0f;
+            d->colorMatrix[9] = 0.0f;
+            d->colorMatrix[10] = oSc;
+            d->colorMatrix[11] = 0.0f;
+            d->colorMatrix[12] = 0.0f;
+            d->colorMatrix[13] = 0.0f;
+            d->colorMatrix[14] = 0.0f;
+            d->colorMatrix[15] = 1.0f;
+            d->colorMatrix[16] = oOff;
+            d->colorMatrix[17] = oOff;
+            d->colorMatrix[18] = oOff;
+            d->colorMatrix[19] = 0.0f;
+        }
+        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
+}