//
// Copyright 2019 Mateusz Loskot <mateusz at loskot dot net>
//
// 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
//
#include <boost/gil.hpp>

#define BOOST_TEST_MODULE test_image_view_subimage_view
#include "unit_test.hpp"
#include "unit_test_utility.hpp"
#include "core/image/test_fixture.hpp"

namespace gil = boost::gil;
namespace fixture = boost::gil::test::fixture;

BOOST_AUTO_TEST_SUITE(subimage_view)

BOOST_AUTO_TEST_CASE_TEMPLATE(subimage_equals_image, Image, fixture::image_types)
{
    auto i0 = fixture::create_image<Image>(4, 4, 128);
    auto const v0 = gil::const_view(i0);
    BOOST_TEST(v0.dimensions().x == 4);
    BOOST_TEST(v0.dimensions().y == 4);

    // request with 2 x point_t values
    {
        auto v1 = gil::subimage_view(gil::view(i0), {0, 0}, i0.dimensions());
        BOOST_TEST(v0.dimensions() == v1.dimensions());
        BOOST_TEST(gil::equal_pixels(v0, v1));
    }
    // request with 4 x dimension values
    {
        auto v1 = gil::subimage_view(gil::view(i0), 0, 0, i0.dimensions().x, i0.dimensions().y);
        BOOST_TEST(v0.dimensions() == v1.dimensions());
        BOOST_TEST(gil::equal_pixels(v0, v1));
    }
}

BOOST_AUTO_TEST_CASE_TEMPLATE(subimage_equals_image_quadrants, Image, fixture::image_types)
{
    auto i0 = fixture::create_image<Image>(4, 4, 0);
    auto v0 = gil::view(i0);
    // create test image and set values of pixels in:
    //  quadrant 1
    auto const i1 = fixture::create_image<Image>(2, 2, 255);
    v0[2] = v0[3] = v0[6] = v0[7] = gil::const_view(i1)[0];
    //  quadrant 2
    auto const i2 = fixture::create_image<Image>(2, 2, 128);
    v0[0] = v0[1] = v0[4] = v0[5] = gil::const_view(i2)[0];
    //  quadrant 3
    auto const i3 = fixture::create_image<Image>(2, 2, 64);
    v0[8] = v0[9] = v0[12] = v0[13] = gil::const_view(i3)[0];
    //  quadrant 4
    auto const i4 = fixture::create_image<Image>(2, 2, 32);
    v0[10] = v0[11] = v0[14] = v0[15] = gil::const_view(i4)[0];

    auto v1 = gil::subimage_view(gil::view(i0), { 2, 0 }, i0.dimensions() / 2);
    BOOST_TEST(gil::equal_pixels(v1, gil::const_view(i1)));
    auto v2 = gil::subimage_view(gil::view(i0), { 0, 0 }, i0.dimensions() / 2);
    BOOST_TEST(gil::equal_pixels(v2, gil::const_view(i2)));
    auto v3 = gil::subimage_view(gil::view(i0), { 0, 2 }, i0.dimensions() / 2);
    BOOST_TEST(gil::equal_pixels(v3, gil::const_view(i3)));
    auto v4 = gil::subimage_view(gil::view(i0), { 2, 2 }, i0.dimensions() / 2);
    BOOST_TEST(gil::equal_pixels(v4, gil::const_view(i4)));
}

BOOST_AUTO_TEST_SUITE_END()