/*
 * $Id: keaoverview.cpp 33720 2016-03-15 00:39:53Z goatbar $
 *  keaoverview.cpp
 *
 *  Created by Pete Bunting on 01/08/2012.
 *  Copyright 2012 LibKEA. All rights reserved.
 *
 *  This file is part of LibKEA.
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without restriction,
 *  including without limitation the rights to use, copy, modify,
 *  merge, publish, distribute, sublicense, and/or sell copies of the
 *  Software, and to permit persons to whom the Software is furnished
 *  to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
 *  ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "keaoverview.h"

// constructor
KEAOverview::KEAOverview(KEADataset *pDataset, int nSrcBand, GDALAccess eAccessIn,
                kealib::KEAImageIO *pImageIO, int *pRefCount,
                int nOverviewIndex, uint64_t nXSize, uint64_t nYSize)
 : KEARasterBand( pDataset, nSrcBand, eAccessIn, pImageIO, pRefCount )
{
    this->m_nOverviewIndex = nOverviewIndex;
    // overridden from the band - not the same size as the band obviously
    this->nBlockXSize = pImageIO->getOverviewBlockSize(nSrcBand, nOverviewIndex);
    this->nBlockYSize = pImageIO->getOverviewBlockSize(nSrcBand, nOverviewIndex);
    this->nRasterXSize = static_cast<int>(nXSize);
    this->nRasterYSize = static_cast<int>(nYSize);
}

KEAOverview::~KEAOverview()
{

}

// overridden implementation - calls readFromOverview instead
CPLErr KEAOverview::IReadBlock( int nBlockXOff, int nBlockYOff, void * pImage )
{
    try
    {
        // GDAL deals in blocks - if we are at the end of a row
        // we need to adjust the amount read so we don't go over the edge
        int nxsize = this->nBlockXSize;
        int nxtotalsize = this->nBlockXSize * (nBlockXOff + 1);
        if( nxtotalsize > this->nRasterXSize )
        {
            nxsize -= (nxtotalsize - this->nRasterXSize);
        }
        int nysize = this->nBlockYSize;
        int nytotalsize = this->nBlockYSize * (nBlockYOff + 1);
        if( nytotalsize > this->nRasterYSize )
        {
            nysize -= (nytotalsize - this->nRasterYSize);
        }
        this->m_pImageIO->readFromOverview( this->nBand, this->m_nOverviewIndex,
                                            pImage, this->nBlockXSize * nBlockXOff,
                                            this->nBlockYSize * nBlockYOff,
                                            nxsize, nysize, this->nBlockXSize, this->nBlockYSize,
                                            this->m_eKEADataType );
        return CE_None;
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                "Failed to read file: %s", e.what() );
        return CE_Failure;
    }
}

// overridden implementation - calls writeToOverview instead
CPLErr KEAOverview::IWriteBlock( int nBlockXOff, int nBlockYOff, void * pImage )
{
    try
    {
        // GDAL deals in blocks - if we are at the end of a row
        // we need to adjust the amount written so we don't go over the edge
        int nxsize = this->nBlockXSize;
        int nxtotalsize = this->nBlockXSize * (nBlockXOff + 1);
        if( nxtotalsize > this->nRasterXSize )
        {
            nxsize -= (nxtotalsize - this->nRasterXSize);
        }
        int nysize = this->nBlockYSize;
        int nytotalsize = this->nBlockYSize * (nBlockYOff + 1);
        if( nytotalsize > this->nRasterYSize )
        {
            nysize -= (nytotalsize - this->nRasterYSize);
        }

        this->m_pImageIO->writeToOverview( this->nBand, this->m_nOverviewIndex,
                                            pImage, this->nBlockXSize * nBlockXOff,
                                            this->nBlockYSize * nBlockYOff,
                                            nxsize, nysize, this->nBlockXSize, this->nBlockYSize,
                                            this->m_eKEADataType );
        return CE_None;
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                "Failed to write file: %s", e.what() );
        return CE_Failure;
    }
}

GDALRasterAttributeTable *KEAOverview::GetDefaultRAT()
{
    // KEARasterBand implements this, but we don't want to
    return NULL;
}

CPLErr KEAOverview::SetDefaultRAT(CPL_UNUSED const GDALRasterAttributeTable *poRAT)
{
    // KEARasterBand implements this, but we don't want to
    return CE_Failure;
}
