EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/gil/test/extension/io/png_read_test.cpp

//
// Copyright 2013 Christian Henning
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
//#define BOOST_TEST_MODULE png_read_test_module
#define BOOST_GIL_IO_ADD_FS_PATH_SUPPORT
#define BOOST_GIL_IO_ENABLE_GRAY_ALPHA
#define BOOST_FILESYSTEM_VERSION 3

#include <boost/gil/extension/io/png.hpp>

#include <boost/test/unit_test.hpp>

#include <cstdint>
#include <iostream>

#include "paths.hpp"
#include "scanline_read_test.hpp"
#include "unit_test_utility.hpp"

using namespace std;
using namespace boost;
using namespace gil;
using namespace boost::gil::detail;
namespace fs = boost::filesystem;

using tag_t = png_tag;

BOOST_AUTO_TEST_SUITE( gil_io_png_tests )

using gray_alpha8_pixel_t = pixel<uint8_t, gray_alpha_layout_t>;
using gray_alpha8_image_t= image<gray_alpha8_pixel_t, false>;

using gray_alpha16_pixel_t = pixel<uint16_t, gray_alpha_layout_t>;
using gray_alpha16_image_t = image<gray_alpha16_pixel_t, false>;

template< typename Image >
void test_file( string filename )
{
    Image src, dst;

    image_read_settings< png_tag > settings;
    settings._read_file_gamma        = true;
    settings._read_transparency_data = true;


    using backend_t = get_reader_backend<std::string const, tag_t>::type;

    backend_t backend = read_image_info( png_in + filename
                                        , settings
                                        );

    read_image( png_in + filename
              , src
              , settings
              );


#ifdef BOOST_GIL_IO_TEST_ALLOW_WRITING_IMAGES
    image_write_info< png_tag > write_info;
    write_info._file_gamma = backend._info._file_gamma;

    write_view( png_out + filename
              , view( src )
              , write_info
              );

    read_image( png_out + filename
              , dst
              , settings
              );


    BOOST_CHECK( equal_pixels( const_view( src )
                             , const_view( dst )
                             )
               );
#endif // BOOST_GIL_IO_TEST_ALLOW_WRITING_IMAGES
}

template< typename Image >
void test_png_scanline_reader( string filename )
{
    test_scanline_reader<Image, png_tag>( string( png_in + filename ).c_str() );
}

BOOST_AUTO_TEST_CASE( read_header_test )
{
    using backend_t = get_reader_backend<std::string const, tag_t>::type;

    backend_t backend = read_image_info( png_filename
                                       , tag_t()
                                       );

    BOOST_CHECK_EQUAL( backend._info._width , 1000u );
    BOOST_CHECK_EQUAL( backend._info._height,  600u );

    BOOST_CHECK_EQUAL( backend._info._num_channels, 4                   );
    BOOST_CHECK_EQUAL( backend._info._bit_depth   , 8                   );
    BOOST_CHECK_EQUAL( backend._info._color_type  , PNG_COLOR_TYPE_RGBA );

    BOOST_CHECK_EQUAL( backend._info._interlace_method  , PNG_INTERLACE_NONE        );
    BOOST_CHECK_EQUAL( backend._info._compression_method, PNG_COMPRESSION_TYPE_BASE );
    BOOST_CHECK_EQUAL( backend._info._filter_method     , PNG_FILTER_TYPE_BASE      );


    BOOST_CHECK_EQUAL( backend._info._file_gamma, 1 );
}

#ifdef BOOST_GIL_IO_TEST_ALLOW_READING_IMAGES

BOOST_AUTO_TEST_CASE( read_pixel_per_meter )
{
    image_read_settings< png_tag > settings;
    settings.set_read_members_true();

    using backend_t = get_reader_backend<std::string const, tag_t>::type;

    backend_t backend = read_image_info( png_base_in + "EddDawson/36dpi.png"
                                      , settings
                                      );

    BOOST_CHECK_EQUAL( backend._info._pixels_per_meter, png_uint_32( 1417 ));
}

BOOST_AUTO_TEST_CASE(read_with_trns_chunk_color_type_0)
{
    // PNG 1.2: For color type 0 (grayscale), the tRNS chunk contains a single gray level value,
    // stored in the format:
    //
    // Gray:  2 bytes, range 0 .. (2^bitdepth)-1
    {
        auto const png_path = png_in + "tbbn0g04.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 4);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_GRAY);

        gray_alpha8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == gray_alpha8c_pixel_t(255, 0));
        BOOST_TEST(const_view(img)[78] == gray_alpha8c_pixel_t(221, 255));
        BOOST_TEST(const_view(img)[79] == gray_alpha8c_pixel_t(204, 255));
        BOOST_TEST(const_view(img)[975] == gray_alpha8c_pixel_t(238, 255));
        BOOST_TEST(const_view(img)[976] == gray_alpha8c_pixel_t(221, 255));
        BOOST_TEST(const_view(img).back() == gray_alpha8c_pixel_t(255, 0));
    }
    {
        auto const png_path = png_in + "tbwn0g16.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 16);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_GRAY);

        gray_alpha16_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == gray_alpha16c_pixel_t(65535, 0));
        BOOST_TEST(const_view(img)[78] == gray_alpha16c_pixel_t(58339, 65535));
        BOOST_TEST(const_view(img)[79] == gray_alpha16c_pixel_t(51657, 65535));
        BOOST_TEST(const_view(img)[975] == gray_alpha16c_pixel_t(62965, 65535));
        BOOST_TEST(const_view(img)[976] == gray_alpha16c_pixel_t(58339, 65535));
        BOOST_TEST(const_view(img).back() == gray_alpha16c_pixel_t(65535, 0));
    }
}

BOOST_AUTO_TEST_CASE(read_with_trns_chunk_color_type_2)
{
    // PNG 1.2: For color type 2 (truecolor), the tRNS chunk contains a single RGB color value,
    // stored in the format:
    // 
    // Red:   2 bytes, range 0 .. (2^bitdepth)-1
    // Green: 2 bytes, range 0 .. (2^bitdepth)-1
    // Blue:  2 bytes, range 0 .. (2^bitdepth)-1
    {
        auto const png_path = png_in + "tbbn2c16.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 16);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 3u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_RGB);

        rgba16_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba16c_pixel_t(65535, 65535, 65535, 0));
        BOOST_TEST(const_view(img)[78] == rgba16c_pixel_t(58339, 58339, 58339, 65535));
        BOOST_TEST(const_view(img)[79] == rgba16c_pixel_t(51657, 51657, 51657, 65535));
        BOOST_TEST(const_view(img)[975] == rgba16c_pixel_t(62965, 62965, 62965, 65535));
        BOOST_TEST(const_view(img)[976] == rgba16c_pixel_t(58339, 58339, 58339, 65535));
        BOOST_TEST(const_view(img).back() == rgba16c_pixel_t(65535, 65535, 65535, 0));
    }
    {
        auto const png_path = png_in + "tbgn2c16.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 16);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 3u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_RGB);

        rgba16_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba16c_pixel_t(65535, 65535, 65535, 0));
        BOOST_TEST(const_view(img)[78] == rgba16c_pixel_t(58339, 58339, 58339, 65535));
        BOOST_TEST(const_view(img)[79] == rgba16c_pixel_t(51657, 51657, 51657, 65535));
        BOOST_TEST(const_view(img)[975] == rgba16c_pixel_t(62965, 62965, 62965, 65535));
        BOOST_TEST(const_view(img)[976] == rgba16c_pixel_t(58339, 58339, 58339, 65535));
        BOOST_TEST(const_view(img).back() == rgba16c_pixel_t(65535, 65535, 65535, 0));
    }
    {
        auto const png_path = png_in + "tbrn2c08.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 8);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 3u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_RGB);

        rgba8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba8c_pixel_t(255, 255, 255, 0));
        BOOST_TEST(const_view(img)[78] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img)[79] == rgba8c_pixel_t(201, 201, 201, 255));
        BOOST_TEST(const_view(img)[975] == rgba8c_pixel_t(245, 245, 245, 255));
        BOOST_TEST(const_view(img)[976] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img).back() == rgba8c_pixel_t(255, 255, 255, 0));
    }
}

BOOST_AUTO_TEST_CASE(read_with_trns_chunk_color_type_3)
{
    // PNG 1.2: For color type 3 (indexed color), the tRNS chunk contains a series of one-byte
    // alpha values, corresponding to entries in the PLTE chunk:
    // 
    // Alpha for palette index 0:  1 byte
    // Alpha for palette index 1:  1 byte
    // ...etc...
    {
        auto const png_path = png_in + "tbbn3p08.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 8);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_PALETTE);

        rgba8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba8c_pixel_t(255, 255, 255, 0));
        BOOST_TEST(const_view(img)[78] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img)[79] == rgba8c_pixel_t(201, 201, 201, 255));
        BOOST_TEST(const_view(img)[975] == rgba8c_pixel_t(246, 246, 246, 255));
        BOOST_TEST(const_view(img)[976] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img).back() == rgba8c_pixel_t(255, 255, 255, 0));
    }
    {
        auto const png_path = png_in + "tbgn3p08.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 8);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_PALETTE);

        rgba8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba8c_pixel_t(255, 255, 255, 0));
        BOOST_TEST(const_view(img)[78] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img)[79] == rgba8c_pixel_t(201, 201, 201, 255));
        BOOST_TEST(const_view(img)[975] == rgba8c_pixel_t(246, 246, 246, 255));
        BOOST_TEST(const_view(img)[976] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img).back() == rgba8c_pixel_t(255, 255, 255, 0));
    }
    {
        auto const png_path = png_in + "tp1n3p08.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 8);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_PALETTE);

        rgba8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba8c_pixel_t(255, 255, 255, 0));
        BOOST_TEST(const_view(img)[78] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img)[79] == rgba8c_pixel_t(201, 201, 201, 255));
        BOOST_TEST(const_view(img)[975] == rgba8c_pixel_t(246, 246, 246, 255));
        BOOST_TEST(const_view(img)[976] == rgba8c_pixel_t(227, 227, 227, 255));
        BOOST_TEST(const_view(img).back() == rgba8c_pixel_t(255, 255, 255, 0));
    }
    {
        auto const png_path = png_in + "tm3n3p02.png";
        image_read_settings<png_tag> settings;
        settings.set_read_members_true();
        auto backend = read_image_info(png_path, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_CHECK_EQUAL(backend._info._bit_depth, 2);
        BOOST_CHECK_EQUAL(backend._info._num_channels, 1u);
        BOOST_CHECK_EQUAL(backend._info._color_type, PNG_COLOR_TYPE_PALETTE);

        rgba8_image_t img;
        read_image(png_path, img, settings);
        BOOST_CHECK_EQUAL(backend._info._width, 32u);
        BOOST_CHECK_EQUAL(backend._info._height, 32u);
        BOOST_TEST(const_view(img).front() == rgba8c_pixel_t(0, 0, 255, 0));
        BOOST_TEST(const_view(img)[16] == rgba8c_pixel_t(0, 0, 255, 85));
        BOOST_TEST(const_view(img)[511] == rgba8c_pixel_t(0, 0, 255, 85));
        BOOST_TEST(const_view(img)[1007] == rgba8c_pixel_t(0, 0, 255, 170));
        BOOST_TEST(const_view(img).back() == rgba8c_pixel_t(0, 0, 255, 255));
    }
}

#endif // BOOST_GIL_IO_TEST_ALLOW_READING_IMAGES

#ifdef BOOST_GIL_IO_USE_PNG_TEST_SUITE_IMAGES

BOOST_AUTO_TEST_CASE( BASIc_format_test )
{
    // Basic format test files (non-interlaced)

    // BASN0g01    -   black & white
    test_file< gray1_image_t >( "BASN0G01.PNG" );
    test_png_scanline_reader< gray1_image_t >( "BASN0G01.PNG" );

    // BASN0g02    -   2 bit (4 level) grayscale
    test_file< gray2_image_t >( "BASN0G02.PNG" );
    test_png_scanline_reader< gray2_image_t >( "BASN0G02.PNG" );

    // BASN0g04    -   4 bit (16 level) grayscale
    test_file< gray4_image_t >( "BASN0G04.PNG" );
    test_png_scanline_reader< gray4_image_t >( "BASN0G04.PNG" );

    // BASN0g08    -   8 bit (256 level) grayscale
    test_file< gray8_image_t >( "BASN0G08.PNG" );
    test_png_scanline_reader< gray8_image_t >( "BASN0G08.PNG" );

    // BASN0g16    -   16 bit (64k level) grayscale
    test_file< gray16_image_t >( "BASN0G16.PNG" );
    test_png_scanline_reader< gray16_image_t >( "BASN0G16.PNG" );

    // BASN2c08    -   3x8 bits rgb color
    test_file< rgb8_image_t >( "BASN2C08.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "BASN2C08.PNG" );

    // BASN2c16    -   3x16 bits rgb color
    test_file< rgb16_image_t >( "BASN2C16.PNG" );
    test_png_scanline_reader< rgb16_image_t >( "BASN2C16.PNG" );

    // BASN3p01    -   1 bit (2 color) paletted
    test_file< rgb8_image_t >( "BASN3P01.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "BASN3P01.PNG" );

    // BASN3p02    -   2 bit (4 color) paletted
    test_file< rgb8_image_t >( "BASN3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "BASN3P02.PNG" );

    // BASN3p04    -   4 bit (16 color) paletted
    test_file< rgb8_image_t >( "BASN3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "BASN3P04.PNG" );

    // BASN3p08    -   8 bit (256 color) paletted
    test_file< rgb8_image_t >( "BASN3P08.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "BASN3P08.PNG" );

    // BASN4a08    -   8 bit grayscale + 8 bit alpha-channel
    test_file< gray_alpha8_image_t >( "BASN4A08.PNG" );
    test_png_scanline_reader< gray_alpha8_image_t >( "BASN4A08.PNG" );

    // BASN4a16    -   16 bit grayscale + 16 bit alpha-channel
    test_file< gray_alpha16_image_t >( "BASN4A16.PNG" );
    test_png_scanline_reader< gray_alpha16_image_t >( "BASN4A16.PNG" );

    // BASN6a08    -   3x8 bits rgb color + 8 bit alpha-channel
    test_file< rgba8_image_t >( "BASN6A08.PNG" );
    test_png_scanline_reader< rgba8_image_t >( "BASN6A08.PNG" );

    // BASN6a16    -   3x16 bits rgb color + 16 bit alpha-channel
    test_file< rgba16_image_t >( "BASN6A16.PNG" );
    test_png_scanline_reader< rgba16_image_t >( "BASN6A16.PNG" );
}

BOOST_AUTO_TEST_CASE( BASIc_format_interlaced_test )
{
    // Basic format test files (Adam-7 interlaced)

    // BASI0g01    -   black & white
    test_file< gray1_image_t >( "BASI0G01.PNG" );

    // BASI0g02    -   2 bit (4 level) grayscale
    test_file< gray2_image_t >( "BASI0G02.PNG" );

    // BASI0g04    -   4 bit (16 level) grayscale
    test_file< gray4_image_t >( "BASI0G04.PNG" );

    // BASI0g08    -   8 bit (256 level) grayscale
    test_file< gray8_image_t >( "BASI0G08.PNG" );

    // BASI0g16    -   16 bit (64k level) grayscale
    test_file< gray16_image_t >( "BASI0G16.PNG" );

    // BASI2c08    -   3x8 bits rgb color
    test_file< rgb8_image_t >( "BASI2C08.PNG" );

    // BASI2c16    -   3x16 bits rgb color
    test_file< rgb16_image_t >( "BASI2C16.PNG" );

    // BASI3p01    -   1 bit (2 color) paletted
    test_file< rgb8_image_t >( "BASI3P01.PNG" );

    // BASI3p02    -   2 bit (4 color) paletted
    test_file< rgb8_image_t >( "BASI3P02.PNG" );

    // BASI3p04    -   4 bit (16 color) paletted
    test_file< rgb8_image_t >( "BASI3P04.PNG" );

    // BASI3p08    -   8 bit (256 color) paletted
    test_file< rgb8_image_t >( "BASI3P08.PNG" );

    // BASI4a08    -   8 bit grayscale + 8 bit alpha-channel
    test_file< gray_alpha8_image_t >( "BASI4A08.PNG" );

    // BASI4a16    -   16 bit grayscale + 16 bit alpha-channel
    test_file< gray_alpha16_image_t >( "BASI4A16.PNG" );

    // BASI6a08    -   3x8 bits rgb color + 8 bit alpha-channel
    test_file< rgba8_image_t >( "BASI6A08.PNG" );

    // BASI6a16    -   3x16 bits rgb color + 16 bit alpha-channel
    test_file< rgba16_image_t >( "BASI6A16.PNG" );
}

BOOST_AUTO_TEST_CASE( odd_sizes_test )
{
    // S01I3P01 - 1x1 paletted file, interlaced
    test_file< rgb8_image_t >( "S01I3P01.PNG" );

    // S01N3P01 - 1x1 paletted file, no interlacing
    test_file< rgb8_image_t >( "S01N3P01.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S01N3P01.PNG" );

    // S02I3P01 - 2x2 paletted file, interlaced
    test_file< rgb8_image_t >( "S02I3P01.PNG" );

    // S02N3P01 - 2x2 paletted file, no interlacing
    test_file< rgb8_image_t >( "S02N3P01.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S02N3P01.PNG" );

    // S03I3P01 - 3x3 paletted file, interlaced
    test_file< rgb8_image_t >( "S03I3P01.PNG" );

    // S03N3P01 - 3x3 paletted file, no interlacing
    test_file< rgb8_image_t >( "S03N3P01.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S03N3P01.PNG" );

    // S04I3P01 - 4x4 paletted file, interlaced
    test_file< rgb8_image_t >( "S04I3P01.PNG" );

    // S04N3P01 - 4x4 paletted file, no interlacing
    test_file< rgb8_image_t >( "S04N3P01.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S04N3P01.PNG" );

    // S05I3P02 - 5x5 paletted file, interlaced
    test_file< rgb8_image_t >( "S05I3P02.PNG" );

    // S05N3P02 - 5x5 paletted file, no interlacing
    test_file< rgb8_image_t >( "S05N3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S05N3P02.PNG" );

    // S06I3P02 - 6x6 paletted file, interlaced
    test_file< rgb8_image_t >( "S06I3P02.PNG" );

    // S06N3P02 - 6x6 paletted file, no interlacing
    test_file< rgb8_image_t >( "S06N3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S06N3P02.PNG" );

    // S07I3P02 - 7x7 paletted file, interlaced
    test_file< rgb8_image_t >( "S07I3P02.PNG" );

    // S07N3P02 - 7x7 paletted file, no interlacing
    test_file< rgb8_image_t >( "S07N3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S07N3P02.PNG" );

    // S08I3P02 - 8x8 paletted file, interlaced
    test_file< rgb8_image_t >( "S08I3P02.PNG" );

    // S08N3P02 - 8x8 paletted file, no interlacing
    test_file< rgb8_image_t >( "S08N3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S08N3P02.PNG" );

    // S09I3P02 - 9x9 paletted file, interlaced
    test_file< rgb8_image_t >( "S09I3P02.PNG" );

    // S09N3P02 - 9x9 paletted file, no interlacing
    test_file< rgb8_image_t >( "S09N3P02.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S09N3P02.PNG" );

    // S32I3P04 - 32x32 paletted file, interlaced
    test_file< rgb8_image_t >( "S32I3P04.PNG" );

    // S32N3P04 - 32x32 paletted file, no interlacing
    test_file< rgb8_image_t >( "S32N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S32N3P04.PNG" );

    // S33I3P04 - 33x33 paletted file, interlaced
    test_file< rgb8_image_t >( "S33I3P04.PNG" );

    // S33N3P04 - 33x33 paletted file, no interlacing
    test_file< rgb8_image_t >( "S33N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S33N3P04.PNG" );

    // S34I3P04 - 34x34 paletted file, interlaced
    test_file< rgb8_image_t >( "S34I3P04.PNG" );

    // S34N3P04 - 34x34 paletted file, no interlacing
    test_file< rgb8_image_t >( "S34N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S34N3P04.PNG" );

    // S35I3P04 - 35x35 paletted file, interlaced
    test_file< rgb8_image_t >( "S35I3P04.PNG" );

    // S35N3P04 - 35x35 paletted file, no interlacing
    test_file< rgb8_image_t >( "S35N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S35N3P04.PNG" );

    // S36I3P04 - 36x36 paletted file, interlaced
    test_file< rgb8_image_t >( "S36I3P04.PNG" );

    // S36N3P04 - 36x36 paletted file, no interlacing
    test_file< rgb8_image_t >( "S36N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S36N3P04.PNG" );

    // S37I3P04 - 37x37 paletted file, interlaced
    test_file< rgb8_image_t >( "S37I3P04.PNG" );

    // S37N3P04 - 37x37 paletted file, no interlacing
    test_file< rgb8_image_t >( "S37N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S37N3P04.PNG" );

    // S38I3P04 - 38x38 paletted file, interlaced
    test_file< rgb8_image_t >( "S38I3P04.PNG" );

    // S38N3P04 - 38x38 paletted file, no interlacing
    test_file< rgb8_image_t >( "S38N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S38N3P04.PNG" );

    // S39I3P04 - 39x39 paletted file, interlaced
    test_file< rgb8_image_t >( "S39I3P04.PNG" );

    // S39N3P04 - 39x39 paletted file, no interlacing
    test_file< rgb8_image_t >( "S39N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S39N3P04.PNG" );

    // S40I3P04 - 40x40 paletted file, interlaced
    test_file< rgb8_image_t >( "S40I3P04.PNG" );

    // S40N3P04 - 40x40 paletted file, no interlacing
    test_file< rgb8_image_t >( "S40N3P04.PNG" );
    test_png_scanline_reader< rgb8_image_t >( "S40N3P04.PNG" );
}

BOOST_AUTO_TEST_CASE( background_test )
{
    // BGAI4A08 - 8 bit grayscale, alpha, no background chunk, interlaced
    test_file< gray_alpha8_image_t >( "BGAI4A08.PNG" );

    // BGAI4A16 - 16 bit grayscale, alpha, no background chunk, interlaced
    test_file< gray_alpha16_image_t >( "BGAI4A16.PNG" );

    // BGAN6A08 - 3x8 bits rgb color, alpha, no background chunk
    test_file< rgba8_image_t >( "BGAN6A08.PNG" );

    // BGAN6A16 - 3x16 bits rgb color, alpha, no background chunk
    test_file< rgba16_image_t >( "BGAN6A16.PNG" );

    // BGBN4A08 - 8 bit grayscale, alpha, black background chunk
    test_file< gray_alpha8_image_t >( "BGBN4A08.PNG" );

    // BGGN4A16 - 16 bit grayscale, alpha, gray background chunk
    test_file< gray_alpha16_image_t >( "BGGN4A16.PNG" );

    // BGWN6A08 - 3x8 bits rgb color, alpha, white background chunk
    test_file< rgba8_image_t >( "BGWN6A08.PNG" );

    // BGYN6A16 - 3x16 bits rgb color, alpha, yellow background chunk
    test_file< rgba16_image_t >( "BGYN6A16.PNG" );
}

BOOST_AUTO_TEST_CASE( transparency_test )
{
    // TBBN1G04 - transparent, black background chunk
    // file missing
    //test_file< gray_alpha8_image_t >( "TBBN1G04.PNG" );

    // TBBN2C16 - transparent, blue background chunk
    test_file< rgba16_image_t >( "TBBN2C16.PNG" );

    // TBBN3P08 - transparent, black background chunk
    test_file< rgba8_image_t >( "TBBN3P08.PNG" );

    // TBGN2C16 - transparent, green background chunk
    test_file< rgba16_image_t >( "TBGN2C16.PNG" );

    // TBGN3P08 - transparent, light-gray background chunk
    test_file< rgba8_image_t >( "TBGN3P08.PNG" );

    // TBRN2C08 - transparent, red background chunk
    test_file< rgba8_image_t >( "TBRN2C08.PNG" );

    // TBWN1G16 - transparent, white background chunk
    test_file< gray_alpha16_image_t >( "TBWN0G16.PNG" );

    // TBWN3P08 - transparent, white background chunk
    test_file< rgba8_image_t >( "TBWN3P08.PNG" );

    // TBYN3P08 - transparent, yellow background chunk
    test_file< rgba8_image_t >( "TBYN3P08.PNG" );

    // TP0N1G08 - not transparent for reference (logo on gray)
    test_file< gray8_image_t >( "TP0N0G08.PNG" );

    // TP0N2C08 - not transparent for reference (logo on gray)
    test_file< rgb8_image_t >( "TP0N2C08.PNG" );

    // TP0N3P08 - not transparent for reference (logo on gray)
    test_file< rgb8_image_t >( "TP0N3P08.PNG" );

    // TP1N3P08 - transparent, but no background chunk
    test_file< rgba8_image_t >( "TP1N3P08.PNG" );
}

BOOST_AUTO_TEST_CASE( gamma_test )
{
    // G03N0G16 - grayscale, file-gamma = 0.35
    test_file< gray16_image_t >( "G03N0G16.PNG" );

    // G03N2C08 - color, file-gamma = 0.35
    test_file< rgb8_image_t >( "G03N2C08.PNG" );

    // G03N3P04 - paletted, file-gamma = 0.35
    test_file< rgb8_image_t >( "G03N3P04.PNG" );

    // G04N0G16 - grayscale, file-gamma = 0.45
    test_file< gray16_image_t >( "G04N0G16.PNG" );

    // G04N2C08 - color, file-gamma = 0.45
    test_file< rgb8_image_t >( "G04N2C08.PNG" );

    // G04N3P04 - paletted, file-gamma = 0.45
    test_file< rgb8_image_t >( "G04N3P04.PNG" );

    // G05N0G16 - grayscale, file-gamma = 0.55
    test_file< gray16_image_t >( "G05N0G16.PNG" );

    // G05N2C08 - color, file-gamma = 0.55
    test_file< rgb8_image_t >( "G05N2C08.PNG" );

    // G05N3P04 - paletted, file-gamma = 0.55
    test_file< rgb8_image_t >( "G05N3P04.PNG" );

    // G07N0G16 - grayscale, file-gamma = 0.70
    test_file< gray16_image_t >( "G07N0G16.PNG" );

    // G07N2C08 - color, file-gamma = 0.70
    test_file< rgb8_image_t >( "G07N2C08.PNG" );

    // G07N3P04 - paletted, file-gamma = 0.70
    test_file< rgb8_image_t >( "G07N3P04.PNG" );

    // G10N0G16 - grayscale, file-gamma = 1.00
    test_file< gray16_image_t >( "G10N0G16.PNG" );

    // G10N2C08 - color, file-gamma = 1.00
    test_file< rgb8_image_t >( "G10N2C08.PNG" );

    // G10N3P04 - paletted, file-gamma = 1.00
    test_file< rgb8_image_t >( "G10N3P04.PNG" );

    // G25N0G16 - grayscale, file-gamma = 2.50
    test_file< gray16_image_t >( "G25N0G16.PNG" );

    // G25N2C08 - color, file-gamma = 2.50
    test_file< rgb8_image_t >( "G25N2C08.PNG" );

    // G25N3P04 - paletted, file-gamma = 2.50
    test_file< rgb8_image_t >( "G25N3P04.PNG" );
}

#endif // BOOST_GIL_IO_USE_PNG_TEST_SUITE_IMAGES

BOOST_AUTO_TEST_SUITE_END()