mapnik/test/unit/map/background.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2021 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

}