ganeswidgets/src/hgvgimage.cpp
author hgs
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:    
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*
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*/
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#include "hgvgimage.h"
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#include "hgimagefader.h"
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#include "hgvgquadrenderer.h"
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const int KMaxMirrorWidth(128);
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const int KMaxMirrorHeight(64);
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static QSize getMirrorSize(const QImage& image)
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{
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    return QSize(
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        qMin(image.width() / 2, KMaxMirrorWidth), 
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        qMin(image.height() / 4, KMaxMirrorHeight) 
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        );
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}
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HgVgImage::HgVgImage(HgVgQuadRenderer* renderer) :
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    mVgImage(VG_INVALID_HANDLE),
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    mMirrorImage(VG_INVALID_HANDLE),
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    mMirrorSize(0,0),
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    mRenderer(renderer)
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{
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    setAlpha(1.0);
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}
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HgVgImage::~HgVgImage()
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{
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    releaseImage();
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}
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int HgVgImage::width() const
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{
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    return mQImage.width();
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}
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int HgVgImage::height() const
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{
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    return mQImage.height();
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}
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VGImage HgVgImage::image() const
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{
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    return mVgImage;
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}
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int HgVgImage::mirrorImageWidth() const
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{
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    return mMirrorSize.width();
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}
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int HgVgImage::mirrorImageHeight() const
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{
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    return mMirrorSize.height();
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}
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VGImage HgVgImage::mirrorImage() const
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{
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    return mMirrorImage;
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}
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void HgVgImage::setImage(const QImage& image)
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{
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    if (image.isNull())
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        return;
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    // release previous images vg data
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    releaseImage();
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    mQImage = image;
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    mMirrorSize = getMirrorSize(mQImage);
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}
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void HgVgImage::setPixmap(const QPixmap& pixmap)
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{
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    Q_UNUSED(pixmap)    
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}
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QImage HgVgImage::getQImage() const
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{
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    return mQImage;
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}
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void HgVgImage::releaseImage()
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{
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    if (mVgImage != VG_INVALID_HANDLE)
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    {
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        vgDestroyImage(mVgImage);
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        mVgImage = VG_INVALID_HANDLE;            
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    }
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    if (mMirrorImage != VG_INVALID_HANDLE)
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    {
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        vgDestroyImage(mMirrorImage);
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        mMirrorImage = VG_INVALID_HANDLE;            
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    }
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    // TODO, check that this will free all the previously reserved image resources.
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    mQImage = QImage();
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}
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void HgVgImage::upload(bool mirror)
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{
1
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    if( mQImage.isNull())
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        return;    
0
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    if (mVgImage == VG_INVALID_HANDLE)
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    {            
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        VGImageFormat format;
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        switch (mQImage.format())
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        {
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        case QImage::Format_ARGB32_Premultiplied:
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            format = VG_sARGB_8888_PRE;
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            break;
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        case QImage::Format_ARGB32:
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            format = VG_sARGB_8888;
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            break;
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        case QImage::Format_RGB16:
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            format = VG_sRGB_565;
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            break;
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        default:
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            mQImage = mQImage.convertToFormat(QImage::Format_RGB16);
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            format = VG_sRGB_565;
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            break;
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        }
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        mVgImage = vgCreateImage(format, 
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            mQImage.width(), mQImage.height(),VG_IMAGE_QUALITY_NONANTIALIASED);
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        if (mVgImage == VG_INVALID_HANDLE)
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        {
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            qWarning("HgMediaWall run out of video memory for images!");
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            return;
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        }
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1
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        // bits function performs deep copy if we dont fetch data with const specifier.
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        const uchar *bits = mQImage.bits();
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        vgImageSubData(mVgImage, bits, mQImage.bytesPerLine(), 
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            format, 0, 0, mQImage.width(), mQImage.height() );
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0
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    }
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    if (mirror && mMirrorImage == VG_INVALID_HANDLE)
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    {
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        mMirrorImage = vgCreateImage(VG_sARGB_8888_PRE, mMirrorSize.width(), mMirrorSize.height(), VG_IMAGE_QUALITY_NONANTIALIASED);
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        if (mMirrorImage == VG_INVALID_HANDLE)
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        {
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            qWarning("HgMediaWall run out of video memory for images!");
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            return;
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        }
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        // cut half of the image, then scale to desired width/height if needed
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        QImage mirrorImage = mQImage.copy(0, mQImage.height()/2, mQImage.width(), mQImage.height()/2).scaled(mMirrorSize).convertToFormat(QImage::Format_ARGB32);
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        // apply gradient to alpha channel so that mirror image looks like
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        // it fades under the floor
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        for (int i = 0; i < mirrorImage.height(); i++)
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        {
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            qreal t = qreal(i) / qreal(mirrorImage.height());
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            int a = (int)(t * 255.0);
1
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            uchar* scanline = mirrorImage.scanLine(i);
0
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            for (int j = 0; j < mirrorImage.width(); j++)
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   184
            {
1
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                scanline[j*4+3] = a;
0
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   186
            }        
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   187
        }
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   188
        
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   189
        // copy data to vg image
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   190
        vgImageSubData(mMirrorImage, mirrorImage.bits(), mirrorImage.bytesPerLine(), 
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   191
            VG_sARGB_8888, 0, 0, mirrorImage.width(), mirrorImage.height() );
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   192
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   193
    }
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   194
    
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   195
}
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parents:
diff changeset
   196