/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   

*

*/

#include "HuiFxVg10RenderbufferBase.h"

VGImage CHuiFxVg10RenderbufferBase::AcquireSubImage(const TRect& aRect)

    {

    TSize size = Size();

    TRect parentImageRect(Position(),Size());

    // Clip sub image rect to always be inside the buffer (to avoid error in vgChildImage) 

    TRect clippedRect(aRect);

    clippedRect.Intersection(parentImageRect); 

    if (clippedRect.iTl.iX == 0 && clippedRect.iTl.iY == 0 && clippedRect.Size() == size)

        {

        return Image(); // buffer is exactly the size of the rectangle and correctly positioned --- no need for childimage.

        }

    else

        {

        TInt x;

        TInt y;

        if(BufferType() == EBufferTypeOffscreen) 

            {

            x = 0;

            y = 0;

            }

        else

            {

            x = clippedRect.iTl.iX;

            y = size.iHeight - clippedRect.iBr.iY;    // Note: vertically flipped coordinate system. 

                                                // aRect is in Hitchcock coordinates (top-left 0,0)

                                                // but y is in VG coordinates (bottom-left 0,0).

            }

        VGImage ret = vgChildImage(Image(), x, y, clippedRect.Size().iWidth, clippedRect.Size().iHeight);

        HUIFX_VG_INVARIANT();

        return ret;

        }

    }

void CHuiFxVg10RenderbufferBase::ReleaseSubImage(VGImage aImage)

    {

    if (aImage != Image())

        {

        vgDestroyImage(aImage);

        HUIFX_VG_INVARIANT();

        }

    }