mapnik/test/unit/map/background.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2024 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#include "catch.hpp"

#include <mapnik/map.hpp>
#include <mapnik/agg_renderer.hpp>

#if defined(HAVE_CAIRO)
#include <mapnik/cairo/cairo_renderer.hpp>
#include <mapnik/cairo/cairo_image_util.hpp>
#endif

TEST_CASE("map")
{
    SECTION("set background - agg")
    {
        mapnik::Map map(256, 256);
        mapnik::image_rgba8 image(map.width(), map.height());
        const mapnik::color c1(255, 0, 0);
        mapnik::fill(image, c1);

        CHECK(image(0, 0) == c1.rgba());

        // Fully transparent black should replace red color
        const mapnik::color c2(0, 0, 0, 0);
        map.set_background(c2);
        mapnik::agg_renderer<mapnik::image_rgba8> ren(map, image);
        ren.apply();

        CHECK(image(0, 0) == c2.rgba());
    }

#if defined(HAVE_CAIRO)
    SECTION("set background - cairo")
    {
        mapnik::Map map(256, 256);
        mapnik::cairo_surface_ptr image_surface(
          cairo_image_surface_create(CAIRO_FORMAT_ARGB32, map.width(), map.height()),
          mapnik::cairo_surface_closer());
        mapnik::cairo_ptr image_context(mapnik::create_context(image_surface));

        cairo_set_source_rgba(image_context.get(), 1.0, 0.0, 0.0, 1.0);
        cairo_paint(image_context.get());

        {
            mapnik::image_rgba8 image(map.width(), map.height());
            mapnik::cairo_image_to_rgba8(image, image_surface);
            const mapnik::color c1(255, 0, 0);
            CHECK(image(0, 0) == c1.rgba());
        }

        // Fully transparent black should replace red color
        const mapnik::color c2(0, 0, 0, 0);
        map.set_background(c2);
        mapnik::cairo_renderer<mapnik::cairo_ptr> ren(map, image_context, 1.0);
        ren.apply();

        {
            mapnik::image_rgba8 image(map.width(), map.height());
            mapnik::cairo_image_to_rgba8(image, image_surface);
            CHECK(image(0, 0) == c2.rgba());
        }
    }
#endif
}