test_sdl.cpp

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/*
    Copyright (C) 2023 - 2025
    Part of the Battle for Wesnoth Project https://www.wesnoth.org/
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY.
 
    See the COPYING file for more details.
*/
 
#define GETTEXT_DOMAIN "wesnoth-test"
 
#include "sdl/surface.hpp"
#include "sdl/utils.hpp"
#include "utils/span.hpp"
 
#include <algorithm>
#include <array>
#include <boost/test/unit_test.hpp>
 
constexpr uint32_t red      = 0xFF'FF'00'00;
constexpr uint32_t green    = 0xFF'00'FF'00;
constexpr uint32_t blue     = 0xFF'00'00'FF;
constexpr uint32_t yellow   = 0xFF'FF'FF'00;
constexpr uint32_t white    = 0xFF'FF'FF'FF;
constexpr uint32_t black    = 0xFF'00'00'00;
 
constexpr std::array<uint32_t, 16> img_4x4 {
    red,    white,  green,  black,
    black,  black,  black,  black,
    blue,   white,  yellow, black,
    black,  black,  black,  black,
};
 
constexpr std::array<uint32_t, 4> img_4x4_to_2x2_result {
    red,    green,
    blue,   yellow,
};
 
constexpr std::array<uint32_t, 6> img_4x4_to_3x2_result {
    red,    white,  green,
    blue,   white,  yellow
};
 
template<size_t w, size_t h>
surface array_to_surface(const std::array<uint32_t, w * h>& arr)
{
    surface surf{w, h};
 
    {
        surface_lock surf_lock{surf};
        uint32_t* const pixels = surf_lock.pixels();
        for(size_t i = 0; i < w * h; ++i) {
            pixels[i] = arr[i];
        }
    }
 
    return surf;
}
 
BOOST_AUTO_TEST_SUITE(sdl)
 
BOOST_AUTO_TEST_CASE(test_scale_sharp_nullptr)
{
    surface result = scale_surface_sharp(nullptr, 2, 2);
    BOOST_CHECK_EQUAL(result, nullptr);
}
 
BOOST_AUTO_TEST_CASE(test_scale_sharp_zero)
{
    surface src = array_to_surface<4, 4>(img_4x4);
    surface result = scale_surface_sharp(src, 0, 0);
    BOOST_CHECK_EQUAL(result->w, 0);
    BOOST_CHECK_EQUAL(result->h, 0);
}
 
BOOST_AUTO_TEST_CASE(test_scale_sharp_round)
{
    surface src = array_to_surface<4, 4>(img_4x4);
    surface result = scale_surface_sharp(src, 2, 2);
    const_surface_lock lock{result};
    auto result_pixels = utils::span(lock.pixels(), result.area());
    BOOST_CHECK_EQUAL_COLLECTIONS(
        result_pixels.begin(), result_pixels.end(), img_4x4_to_2x2_result.begin(), img_4x4_to_2x2_result.end());
}
 
BOOST_AUTO_TEST_CASE(test_scale_sharp_fractional)
{
    surface src = array_to_surface<4, 4>(img_4x4);
    surface result = scale_surface_sharp(src, 3, 2);
    const_surface_lock lock{result};
    auto result_pixels = utils::span(lock.pixels(), result.area());
    BOOST_CHECK_EQUAL_COLLECTIONS(
        result_pixels.begin(), result_pixels.end(), img_4x4_to_3x2_result.begin(), img_4x4_to_3x2_result.end());
}
 
BOOST_AUTO_TEST_SUITE_END()