ultimatepp/bazaar/plugin/gdal/frmts/kea/keamaskband.cpp

/*
 * $Id: keamaskband.cpp 28011 2014-11-26 13:47:09Z rouault $
 *  keamaskband.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 "keamaskband.h"

// constructor
KEAMaskBand::KEAMaskBand(GDALRasterBand *pParent, 
                kealib::KEAImageIO *pImageIO, int *pRefCount)
{
    m_nSrcBand = pParent->GetBand();
    poDS = NULL;
    nBand = 0;

    nRasterXSize = pParent->GetXSize();
    nRasterYSize = pParent->GetYSize();

    eDataType = GDT_Byte;
    pParent->GetBlockSize( &nBlockXSize, &nBlockYSize );
    eAccess = pParent->GetAccess();

    // grab the imageio class and its refcount
    this->m_pImageIO = pImageIO;
    this->m_pnRefCount = pRefCount;
    // increment the refcount as we now have a reference to imageio
    (*this->m_pnRefCount)++;
}

KEAMaskBand::~KEAMaskBand()
{
    // according to the docs, this is required
    this->FlushCache();

    // decrement the recount and delete if needed
    (*m_pnRefCount)--;
    if( *m_pnRefCount == 0 )
    {
        try
        {
            m_pImageIO->close();
        }
        catch (kealib::KEAIOException &e)
        {
        }
        delete m_pImageIO;
        delete m_pnRefCount;
    }
}

// overridden implementation - calls readImageBlock2BandMask instead
CPLErr KEAMaskBand::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->readImageBlock2BandMask( this->m_nSrcBand,
                                            pImage, this->nBlockXSize * nBlockXOff,
                                            this->nBlockYSize * nBlockYOff,
                                            nxsize, nysize, this->nBlockXSize, this->nBlockYSize, 
                                            kealib::kea_8uint );
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                "Failed to read file: %s", e.what() );
        return CE_Failure;
    }
    return CE_None;
}

// overridden implementation - calls writeImageBlock2BandMask instead
CPLErr KEAMaskBand::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-> writeImageBlock2BandMask( this->m_nSrcBand, 
                                            pImage, this->nBlockXSize * nBlockXOff,
                                            this->nBlockYSize * nBlockYOff,
                                            nxsize, nysize, this->nBlockXSize, this->nBlockYSize,
                                            kealib::kea_8uint );
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                "Failed to write file: %s", e.what() );
        return CE_Failure;
    }
    return CE_None;
}