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/****************************************************************************************\

    A part of the file implements TIFF reader on base of libtiff library

    (see otherlibs/_graphics/readme.txt for copyright notice)

\****************************************************************************************/

#include "precomp.hpp"

#include "grfmt_tiff.hpp"

namespace cv

{

static const char fmtSignTiffII[] = "II\x2a\x00";

static const char fmtSignTiffMM[] = "MM\x00\x2a";

#ifdef HAVE_TIFF

#include "tiff.h"

#include "tiffio.h"

static int grfmt_tiff_err_handler_init = 0;

static void GrFmtSilentTIFFErrorHandler( const char*, const char*, va_list ) {}

TiffDecoder::TiffDecoder()

{

    m_tif = 0;

    if( !grfmt_tiff_err_handler_init )

    {

        grfmt_tiff_err_handler_init = 1;

        TIFFSetErrorHandler( GrFmtSilentTIFFErrorHandler );

        TIFFSetWarningHandler( GrFmtSilentTIFFErrorHandler );

    }

}

void TiffDecoder::close()

{

    if( m_tif )

    {

        TIFF* tif = (TIFF*)m_tif;

        TIFFClose( tif );

        m_tif = 0;

    }

}

TiffDecoder::~TiffDecoder()

{

    close();

}

size_t TiffDecoder::signatureLength() const

{

    return 4;

}

bool TiffDecoder::checkSignature( const string& signature ) const

{

    return signature.size() >= 4 &&

        (memcmp(signature.c_str(), fmtSignTiffII, 4) == 0 ||

        memcmp(signature.c_str(), fmtSignTiffMM, 4) == 0);

}

ImageDecoder TiffDecoder::newDecoder() const

{

    return new TiffDecoder;

}

bool TiffDecoder::readHeader()

{

    char errmsg[1024];

    bool result = false;

    close();

    TIFF* tif = TIFFOpen( m_filename.c_str(), "rb" );

    if( tif )

    {

        int width = 0, height = 0, photometric = 0;

        m_tif = tif;

        if( TIFFRGBAImageOK( tif, errmsg ) &&

            TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &width ) &&

            TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &height ) &&

            TIFFGetField( tif, TIFFTAG_PHOTOMETRIC, &photometric ))

        {

            int bpp=8, ncn = photometric > 1 ? 3 : 1;

            TIFFGetField( tif, TIFFTAG_BITSPERSAMPLE, &bpp );

            TIFFGetField( tif, TIFFTAG_SAMPLESPERPIXEL, &ncn );

            m_width = width;

            m_height = height;

            if( bpp > 8 &&

               ((photometric != 2 && photometric != 1) ||

                (ncn != 1 && ncn != 3 && ncn != 4)))

                bpp = 8;

            m_type = CV_MAKETYPE(bpp > 8 ? CV_16U : CV_8U, photometric > 1 ? 3 : 1);

            result = true;

        }

    }

    if( !result )

        close();

    return result;

}

bool  TiffDecoder::readData( Mat& img )

{

    bool result = false;

    bool color = img.channels() > 1;

    uchar* data = img.data;

    int step = (int)img.step;

    if( img.depth() != CV_8U && img.depth() != CV_16U )

        return false;

    if( m_tif && m_width && m_height )

    {

        TIFF* tif = (TIFF*)m_tif;

        int tile_width0 = m_width, tile_height0 = 0;

        int x, y, i;

        int is_tiled = TIFFIsTiled(tif);

        int photometric;

        TIFFGetField( tif, TIFFTAG_PHOTOMETRIC, &photometric );

        int bpp = 8, ncn = photometric > 1 ? 3 : 1;

        TIFFGetField( tif, TIFFTAG_BITSPERSAMPLE, &bpp );

        TIFFGetField( tif, TIFFTAG_SAMPLESPERPIXEL, &ncn );

        int dst_bpp = img.depth() == CV_8U ? 8 : 16;

        if( (!is_tiled &&

            TIFFGetField( tif, TIFFTAG_ROWSPERSTRIP, &tile_height0 )) ||

            (is_tiled &&

            TIFFGetField( tif, TIFFTAG_TILEWIDTH, &tile_width0 ) &&

            TIFFGetField( tif, TIFFTAG_TILELENGTH, &tile_height0 )))

        {

            if( tile_width0 <= 0 )

                tile_width0 = m_width;

            if( tile_height0 <= 0 )

                tile_height0 = m_height;

            AutoBuffer<uchar> _buffer(tile_height0*tile_width0*8);

            uchar* buffer = _buffer;

            ushort* buffer16 = (ushort*)buffer;

            int tileidx = 0;

            for( y = 0; y < m_height; y += tile_height0, data += step*tile_height0 )

            {

                int tile_height = tile_height0;

                if( y + tile_height > m_height )

                    tile_height = m_height - y;

                for( x = 0; x < m_width; x += tile_width0, tileidx++ )

                {

                    int tile_width = tile_width0, ok;

                    if( x + tile_width > m_width )

                        tile_width = m_width - x;

                    if( dst_bpp == 8 )

                    {

                        if( !is_tiled )

                            ok = TIFFReadRGBAStrip( tif, y, (uint32*)buffer );

                        else

                            ok = TIFFReadRGBATile( tif, x, y, (uint32*)buffer );

                        if( !ok )

                        {

                            close();

                            return false;

                        }

                        for( i = 0; i < tile_height; i++ )

                            if( color )

                                icvCvt_BGRA2BGR_8u_C4C3R( buffer + i*tile_width*4, 0,

                                                         data + x*3 + step*(tile_height - i - 1), 0,

                                                         cvSize(tile_width,1), 2 );

                            else

                                icvCvt_BGRA2Gray_8u_C4C1R( buffer + i*tile_width*4, 0,

                                                          data + x + step*(tile_height - i - 1), 0,

                                                          cvSize(tile_width,1), 2 );

                    }

                    else

                    {

                        if( !is_tiled )

                            ok = (int)TIFFReadEncodedStrip( tif, tileidx, (uint32*)buffer, (tsize_t)-1 ) >= 0;

                        else

                            ok = (int)TIFFReadEncodedTile( tif, tileidx, (uint32*)buffer, (tsize_t)-1 ) >= 0;

                        if( !ok )

                        {

                            close();

                            return false;

                        }

                        for( i = 0; i < tile_height; i++ )

                        {

                            if( color )

                            {

                                if( ncn == 1 )

                                {

                                    icvCvt_Gray2BGR_16u_C1C3R(buffer16 + i*tile_width*ncn, 0,

                                                              (ushort*)(data + step*i) + x*3, 0,

                                                              cvSize(tile_width,1) );

                                }

                                else if( ncn == 3 )

                                {

                                    icvCvt_RGB2BGR_16u_C3R(buffer16 + i*tile_width*ncn, 0,

                                                           (ushort*)(data + step*i) + x*3, 0,

                                                           cvSize(tile_width,1) );

                                }

                                else

                                {

                                    icvCvt_BGRA2BGR_16u_C4C3R(buffer16 + i*tile_width*ncn, 0,

                                                           (ushort*)(data + step*i) + x*3, 0,

                                                           cvSize(tile_width,1), 2 );

                                }

                            }

                            else

                            {

                                if( ncn == 1 )

                                {

                                    memcpy((ushort*)(data + step*i)+x,

                                           buffer16 + i*tile_width*ncn,

                                           tile_width*sizeof(buffer16[0]));

                                }

                                else

                                {

                                    icvCvt_BGRA2Gray_16u_CnC1R(buffer16 + i*tile_width*ncn, 0,

                                                           (ushort*)(data + step*i) + x, 0,

                                                           cvSize(tile_width,1), ncn, 2 );

                                }

                            }

                        }

                    } 

                }

            }

            result = true;

        }

    }

    close();

    return result;

}

#endif

//////////////////////////////////////////////////////////////////////////////////////////

TiffEncoder::TiffEncoder()

{

    m_description = "TIFF Files (*.tiff;*.tif)";

    m_buf_supported = true;

}

TiffEncoder::~TiffEncoder()

{

}

ImageEncoder TiffEncoder::newEncoder() const

{

    return new TiffEncoder;

}

void  TiffEncoder::writeTag( WLByteStream& strm, TiffTag tag,

                             TiffFieldType fieldType,

                             int count, int value )

{

    strm.putWord( tag );

    strm.putWord( fieldType );

    strm.putDWord( count );

    strm.putDWord( value );

}

bool  TiffEncoder::write( const Mat& img, const vector<int>& )

{

    int channels = img.channels();

    int width = img.cols, height = img.rows;

    int fileStep = width*channels;

    WLByteStream strm;

    if( m_buf )

    {

        if( !strm.open(*m_buf) )

            return false;

    }

    else if( !strm.open(m_filename) )

        return false;

    int rowsPerStrip = (1 << 13)/fileStep;

    if( rowsPerStrip < 1 )

        rowsPerStrip = 1;

    if( rowsPerStrip > height )

        rowsPerStrip = height;

    int i, stripCount = (height + rowsPerStrip - 1) / rowsPerStrip;

    if( m_buf )

        m_buf->reserve( alignSize(stripCount*8 + fileStep*height + 256, 256) );

/*#if defined _DEBUG || !defined WIN32

    int uncompressedRowSize = rowsPerStrip * fileStep;

#endif*/

    int directoryOffset = 0;

    AutoBuffer<int,1024> stripOffsets(stripCount);

    AutoBuffer<short,1024> stripCounts(stripCount);

    AutoBuffer<uchar,1024> _buffer(fileStep+32);

    uchar* buffer = _buffer;

    int  stripOffsetsOffset = 0;

    int  stripCountsOffset = 0;

    int  bitsPerSample = 8; // TODO support 16 bit

    int  y = 0;

    strm.putBytes( fmtSignTiffII, 4 );

    strm.putDWord( directoryOffset );

    // write an image data first (the most reasonable way

    // for compressed images)

    for( i = 0; i < stripCount; i++ )

    {

        int limit = y + rowsPerStrip;

        if( limit > height )

            limit = height;

        stripOffsets[i] = strm.getPos();

        for( ; y < limit; y++ )

        {

            if( channels == 3 )

                icvCvt_BGR2RGB_8u_C3R( img.data + img.step*y, 0, buffer, 0, cvSize(width,1) );

            else if( channels == 4 )

                icvCvt_BGRA2RGBA_8u_C4R( img.data + img.step*y, 0, buffer, 0, cvSize(width,1) );

            strm.putBytes( channels > 1 ? buffer : img.data + img.step*y, fileStep );

        }

        stripCounts[i] = (short)(strm.getPos() - stripOffsets[i]);

        /*assert( stripCounts[i] == uncompressedRowSize ||

                stripCounts[i] < uncompressedRowSize &&

                i == stripCount - 1);*/

    }

    if( stripCount > 2 )

    {

        stripOffsetsOffset = strm.getPos();

        for( i = 0; i < stripCount; i++ )

            strm.putDWord( stripOffsets[i] );

        stripCountsOffset = strm.getPos();

        for( i = 0; i < stripCount; i++ )

            strm.putWord( stripCounts[i] );

    }

    else if(stripCount == 2)

    {

        stripOffsetsOffset = strm.getPos();

        for (i = 0; i < stripCount; i++)

        {

            strm.putDWord (stripOffsets [i]);

        }

        stripCountsOffset = stripCounts [0] + (stripCounts [1] << 16);

    }

    else

    {

        stripOffsetsOffset = stripOffsets[0];

        stripCountsOffset = stripCounts[0];

    }

    if( channels > 1 )

    {

        bitsPerSample = strm.getPos();

        strm.putWord(8);

        strm.putWord(8);

        strm.putWord(8);

        if( channels == 4 )

            strm.putWord(8);

    }

    directoryOffset = strm.getPos();

    // write header

    strm.putWord( 9 );

    /* warning: specification 5.0 of Tiff want to have tags in

       ascending order. This is a non-fatal error, but this cause

       warning with some tools. So, keep this in ascending order */

    writeTag( strm, TIFF_TAG_WIDTH, TIFF_TYPE_LONG, 1, width );

    writeTag( strm, TIFF_TAG_HEIGHT, TIFF_TYPE_LONG, 1, height );

    writeTag( strm, TIFF_TAG_BITS_PER_SAMPLE,

              TIFF_TYPE_SHORT, channels, bitsPerSample );

    writeTag( strm, TIFF_TAG_COMPRESSION, TIFF_TYPE_LONG, 1, TIFF_UNCOMP );

    writeTag( strm, TIFF_TAG_PHOTOMETRIC, TIFF_TYPE_SHORT, 1, channels > 1 ? 2 : 1 );

    writeTag( strm, TIFF_TAG_STRIP_OFFSETS, TIFF_TYPE_LONG,

              stripCount, stripOffsetsOffset );

    writeTag( strm, TIFF_TAG_SAMPLES_PER_PIXEL, TIFF_TYPE_SHORT, 1, channels );

    writeTag( strm, TIFF_TAG_ROWS_PER_STRIP, TIFF_TYPE_LONG, 1, rowsPerStrip );

    writeTag( strm, TIFF_TAG_STRIP_COUNTS,

              stripCount > 1 ? TIFF_TYPE_SHORT : TIFF_TYPE_LONG,

              stripCount, stripCountsOffset );

    strm.putDWord(0);

    strm.close();

    if( m_buf )

    {

        (*m_buf)[4] = (uchar)directoryOffset;

        (*m_buf)[5] = (uchar)(directoryOffset >> 8);

        (*m_buf)[6] = (uchar)(directoryOffset >> 16);

        (*m_buf)[7] = (uchar)(directoryOffset >> 24);

    }

    else

    {

        // write directory offset

        FILE* f = fopen( m_filename.c_str(), "r+b" );

        buffer[0] = (uchar)directoryOffset;

        buffer[1] = (uchar)(directoryOffset >> 8);

        buffer[2] = (uchar)(directoryOffset >> 16);

        buffer[3] = (uchar)(directoryOffset >> 24);

        fseek( f, 4, SEEK_SET );

        fwrite( buffer, 1, 4, f );

        fclose(f);

    }

    return true;

}

}