/******************************************************************************
 * $Id: nitfwritejpeg.cpp 20996 2010-10-28 18:38:15Z rouault $
 *
 * Project:  NITF Read/Write Translator
 * Purpose:  GDALDataset/GDALRasterBand implementation on top of "nitflib".
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam
 *
 * Portions Copyright (c) Her majesty the Queen in right of Canada as
 * represented by the Minister of National Defence, 2006.
 *
 * 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.
 ****************************************************************************/

#ifdef JPEG_SUPPORTED

#include "cpl_port.h"
#include "gdal_pam.h"

CPL_C_START
#ifdef LIBJPEG_12_PATH 
#  include LIBJPEG_12_PATH
#else
#  include "jpeglib.h"
#endif
CPL_C_END

/*  
* Do we want to do special processing suitable for when JSAMPLE is a 
* 16bit value?   
*/ 
#if defined(JPEG_LIB_MK1)
#  define JPEG_LIB_MK1_OR_12BIT 1
#elif BITS_IN_JSAMPLE == 12
#  define JPEG_LIB_MK1_OR_12BIT 1
#endif

#if defined(JPEG_DUAL_MODE_8_12) && !defined(NITFWriteJPEGBlock)
int 
NITFWriteJPEGBlock_12( GDALDataset *poSrcDS, VSILFILE *fp,
                     int nBlockXOff, int nBlockYOff,
                     int nBlockXSize, int nBlockYSize,
                     int bProgressive, int nQuality,
                     const GByte* pabyAPP6, int nRestartInterval,
                     GDALProgressFunc pfnProgress, void * pProgressData );
#endif

void jpeg_vsiio_src (j_decompress_ptr cinfo, VSILFILE * infile);
void jpeg_vsiio_dest (j_compress_ptr cinfo, VSILFILE * outfile);

/************************************************************************/
/*                         NITFWriteJPEGBlock()                         */
/************************************************************************/

int 
NITFWriteJPEGBlock( GDALDataset *poSrcDS, VSILFILE *fp,
                    int nBlockXOff, int nBlockYOff,
                    int nBlockXSize, int nBlockYSize,
                    int bProgressive, int nQuality,
                    const GByte* pabyAPP6, int nRestartInterval,
                    GDALProgressFunc pfnProgress, void * pProgressData )
{
    GDALDataType eDT = poSrcDS->GetRasterBand(1)->GetRasterDataType();
#if defined(JPEG_DUAL_MODE_8_12) && !defined(NITFWriteJPEGBlock)
    if( eDT == GDT_UInt16 )
    {
        return NITFWriteJPEGBlock_12(poSrcDS, fp,
                                     nBlockXOff, nBlockYOff,
                                     nBlockXSize, nBlockYSize,
                                     bProgressive, nQuality,
                                     pabyAPP6, nRestartInterval,
                                     pfnProgress, pProgressData );
    }
#endif

    int  nBands = poSrcDS->GetRasterCount();
    int  nXSize = poSrcDS->GetRasterXSize();
    int  nYSize = poSrcDS->GetRasterYSize();
    int  anBandList[3] = {1,2,3};

/* -------------------------------------------------------------------- */
/*      Initialize JPG access to the file.                              */
/* -------------------------------------------------------------------- */
    struct jpeg_compress_struct sCInfo;
    struct jpeg_error_mgr sJErr;
    
    sCInfo.err = jpeg_std_error( &sJErr );
    jpeg_create_compress( &sCInfo );

    jpeg_vsiio_dest( &sCInfo, fp );
    
    sCInfo.image_width = nBlockXSize;
    sCInfo.image_height = nBlockYSize;
    sCInfo.input_components = nBands;

    if( nBands == 1 )
    {
        sCInfo.in_color_space = JCS_GRAYSCALE;
    }
    else
    {
        sCInfo.in_color_space = JCS_RGB;
    }

    jpeg_set_defaults( &sCInfo );
    
#if defined(JPEG_LIB_MK1_OR_12BIT)
    if( eDT == GDT_UInt16 )
    {
        sCInfo.data_precision = 12;
    }
    else
    {
        sCInfo.data_precision = 8;
    }
#endif

    GDALDataType eWorkDT;
#ifdef JPEG_LIB_MK1
    sCInfo.bits_in_jsample = sCInfo.data_precision;
    eWorkDT = GDT_UInt16; /* Always force to 16 bit for JPEG_LIB_MK1 */
#else
    eWorkDT = eDT;
#endif

    sCInfo.write_JFIF_header = FALSE;

    /* Set the restart interval */
    if (nRestartInterval < 0)
    {
        /* nRestartInterval < 0 means that we will guess the value */
        /* so we set it at the maximum allowed by MIL-STD-188-198 */
        /* that is to say the number of MCU per row-block */
        nRestartInterval = nBlockXSize / 8;
    }

    if (nRestartInterval > 0)
        sCInfo.restart_interval = nRestartInterval;

    jpeg_set_quality( &sCInfo, nQuality, TRUE );

    if( bProgressive )
        jpeg_simple_progression( &sCInfo );

    jpeg_start_compress( &sCInfo, TRUE );

/* -------------------------------------------------------------------- */
/*    Emits APP6 NITF application segment (required by MIL-STD-188-198) */
/* -------------------------------------------------------------------- */
    if (pabyAPP6)
    {
        /* 0xe6 = APP6 marker */
        jpeg_write_marker( &sCInfo, 0xe6, (const JOCTET*) pabyAPP6, 23);
    }

/* -------------------------------------------------------------------- */
/*      Loop over image, copying image data.                            */
/* -------------------------------------------------------------------- */
    GByte 	*pabyScanline;
    CPLErr      eErr = CE_None;
    int         nWorkDTSize = GDALGetDataTypeSize(eWorkDT) / 8;

    pabyScanline = (GByte *) CPLMalloc( nBands * nBlockXSize * nWorkDTSize );

    double nTotalPixels = (double)nXSize * nYSize;

    int nBlockXSizeToRead = nBlockXSize;
    if (nBlockXSize * nBlockXOff + nBlockXSize > nXSize)
    {
        nBlockXSizeToRead = nXSize - nBlockXSize * nBlockXOff;
    }
    int nBlockYSizeToRead = nBlockYSize;
    if (nBlockYSize * nBlockYOff + nBlockYSize > nYSize)
    {
        nBlockYSizeToRead = nYSize - nBlockYSize * nBlockYOff;
    }
    
    bool bClipWarn = false;
    for( int iLine = 0; iLine < nBlockYSize && eErr == CE_None; iLine++ )
    {
        JSAMPLE      *ppSamples;

        if (iLine < nBlockYSizeToRead)
        {
            eErr = poSrcDS->RasterIO( GF_Read, nBlockXSize * nBlockXOff, iLine + nBlockYSize * nBlockYOff, nBlockXSizeToRead, 1, 
                                    pabyScanline, nBlockXSizeToRead, 1, eWorkDT,
                                    nBands, anBandList, 
                                    nBands*nWorkDTSize, nBands * nBlockXSize * nWorkDTSize, nWorkDTSize );

#if !defined(JPEG_LIB_MK1_OR_12BIT)
            /* Repeat the last pixel till the end of the line */
            /* to minimize discontinuity */
            if (nBlockXSizeToRead < nBlockXSize)
            {
                for (int iBand = 0; iBand < nBands; iBand++)
                {
                    GByte bVal = pabyScanline[nBands * (nBlockXSizeToRead - 1) + iBand];
                    for(int iX = nBlockXSizeToRead; iX < nBlockXSize; iX ++)
                    {
                        pabyScanline[nBands * iX + iBand ] = bVal;
                    }
                }
            }
#endif
        }

        // clamp 16bit values to 12bit.
        if( eDT == GDT_UInt16 )
        {
            GUInt16 *panScanline = (GUInt16 *) pabyScanline;
            int iPixel;

            for( iPixel = 0; iPixel < nXSize*nBands; iPixel++ )
            {
                if( panScanline[iPixel] > 4095 )
                {
                    panScanline[iPixel] = 4095;
                    if( !bClipWarn )
                    {
                        bClipWarn = true;
                        CPLError( CE_Warning, CPLE_AppDefined,
                                  "One or more pixels clipped to fit 12bit domain for jpeg output." );
                    }
                }
            }
        }

        ppSamples = (JSAMPLE *) pabyScanline;

        if( eErr == CE_None )
            jpeg_write_scanlines( &sCInfo, &ppSamples, 1 );

        double nCurPixels = (double)nBlockYOff * nBlockYSize * nXSize +
                            (double)nBlockXOff * nBlockYSize * nBlockXSize + (iLine + 1) * nBlockXSizeToRead;
        if( eErr == CE_None 
            && !pfnProgress( nCurPixels / nTotalPixels, NULL, pProgressData ) )
        {
            eErr = CE_Failure;
            CPLError( CE_Failure, CPLE_UserInterrupt, 
                      "User terminated CreateCopy()" );
        }
    }

/* -------------------------------------------------------------------- */
/*      Cleanup and close.                                              */
/* -------------------------------------------------------------------- */
    CPLFree( pabyScanline );

    if( eErr == CE_None )
        jpeg_finish_compress( &sCInfo );
    jpeg_destroy_compress( &sCInfo );

    return eErr == CE_None;
}
#endif /* def JPEG_SUPPORTED */
