mapnik/test/unit/imaging/image_io_test.cpp

#include "catch.hpp"

#include <cstring>
#include <mapnik/color.hpp>
#include <mapnik/image.hpp>
#include <mapnik/image_reader.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_util_jpeg.hpp>
#include <mapnik/util/fs.hpp>
#if defined(HAVE_CAIRO)
#include <mapnik/cairo/cairo_context.hpp>
#include <mapnik/cairo/cairo_image_util.hpp>
#endif

#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/format.hpp>
#include <boost/filesystem/convenience.hpp>
#pragma GCC diagnostic pop

inline void make_directory(std::string const& dir) {
    boost::filesystem::create_directories(dir);
}

namespace {
template <typename T>
void check_tiny_png_image_quantising(T const& im)
{
    std::ostringstream ss(std::ios::binary);
    mapnik::save_to_stream(im, ss, "png8");
    ss.flush();
    std::string str = ss.str();
    std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(str.data(), str.size()));
    auto w = reader->width();
    auto h = reader->height();
    CHECK(w > 0);
    CHECK(h > 0);
    auto im2 = mapnik::util::get<mapnik::image_rgba8>(reader->read(0, 0, w, h));
    for (std::size_t i = 0; i < w; ++i)
    {
        for (std::size_t j = 0; j < h; ++j)
        {
            REQUIRE(im2(i,j) == im(i,j));
        }
    }
}

}

TEST_CASE("image io") {

SECTION("readers") {

    std::string should_throw;
    boost::optional<std::string> type;
    try
    {
        mapnik::image_rgba8 im_og;
        auto im_size = mapnik::image_rgba8::pixel_size * im_og.width() * im_og.height();
        mapnik::detail::buffer buf(im_og.bytes(), im_size);
        mapnik::image_rgba8 im2(im_og.width(), im_og.height(), buf.data());
        CHECK( im2.bytes() == im_og.bytes() );
#if defined(HAVE_JPEG)
        should_throw = "./test/data/images/blank.jpg";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        REQUIRE_THROWS(std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type)));

        // actually a png so jpeg reader should throw
        should_throw = "./test/data/images/landusepattern.jpg";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        try
        {
            std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type));
            REQUIRE(false);
        }
        catch (std::exception const& ex)
        {
            REQUIRE( std::string(ex.what()) == std::string("JPEG Reader: libjpeg could not read image: Not a JPEG file: starts with 0x89 0x50") );
        }

#endif

        REQUIRE_THROWS(mapnik::image_rgba8 im(-10,-10)); // should throw rather than overflow

#if defined(HAVE_CAIRO)
        mapnik::cairo_surface_ptr image_surface(
            cairo_image_surface_create(CAIRO_FORMAT_ARGB32,256,257),
            mapnik::cairo_surface_closer());
        mapnik::image_rgba8 im_data(cairo_image_surface_get_width(&*image_surface), cairo_image_surface_get_height(&*image_surface));
        im_data.set(1);
        REQUIRE( (unsigned)im_data(0,0) == unsigned(1) );
        // Should set back to fully transparent
        mapnik::cairo_image_to_rgba8(im_data, image_surface);
        REQUIRE( (unsigned)im_data(0,0) == unsigned(0) );
#endif

#if defined(HAVE_PNG)
        should_throw = "./test/data/images/blank.png";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        REQUIRE_THROWS(std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type)));

        should_throw = "./test/data/images/xcode-CgBI.png";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        REQUIRE_THROWS(std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type)));
#endif

#if defined(HAVE_TIFF)
        should_throw = "./test/data/images/blank.tiff";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        REQUIRE_THROWS(std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type)));
#endif

#if defined(HAVE_WEBP)
        should_throw = "./test/data/images/blank.webp";
        REQUIRE( mapnik::util::exists( should_throw ) );
        type = mapnik::type_from_filename(should_throw);
        REQUIRE( type );
        REQUIRE_THROWS(std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(should_throw,*type)));
#endif
    }
    catch (std::exception const & ex)
    {
        std::clog << ex.what() << "\n";
        REQUIRE(false);
    }

} // END SECTION

SECTION("writers options")
{
#if defined(HAVE_JPEG)
    // test we can parse both jpegXX and quality=XX options
    REQUIRE_THROWS(mapnik::detail::parse_jpeg_quality("jpegXX"));
    REQUIRE_THROWS(mapnik::detail::parse_jpeg_quality("jpeg:quality=XX"));
    int q0 = mapnik::detail::parse_jpeg_quality("jpeg50");
    int q1 = mapnik::detail::parse_jpeg_quality("jpeg:quality=50");
    REQUIRE(q0 == q1);
#endif
} // END SECTION


SECTION("image_util : save_to_file/save_to_stream/save_to_string")
{
    mapnik::image_rgba8 im(256,256);
    std::string named_color = "lightblue";
    mapnik::fill(im, mapnik::color(named_color).rgba());
    ////////////////////////////////////////////////////
    std::vector<std::tuple<std::string, std::string> > supported_types;
#if defined(HAVE_PNG)
    supported_types.push_back(std::make_tuple("png","png"));
    supported_types.push_back(std::make_tuple("png","png24"));
    supported_types.push_back(std::make_tuple("png","png32"));
    supported_types.push_back(std::make_tuple("png","png8"));
    supported_types.push_back(std::make_tuple("png","png256"));
#endif
#if defined(HAVE_JPEG)
    supported_types.push_back(std::make_tuple("jpeg","jpeg"));
    supported_types.push_back(std::make_tuple("jpeg","jpeg80"));
    supported_types.push_back(std::make_tuple("jpeg","jpeg90"));
#endif
#if defined(HAVE_TIFF)
    supported_types.push_back(std::make_tuple("tiff","tiff"));
#endif
#if defined(HAVE_WEBP)
    supported_types.push_back(std::make_tuple("webp","webp"));
#endif

    std::string directory_name("/tmp/mapnik-tests/");
    make_directory(directory_name);
    REQUIRE(mapnik::util::exists(directory_name));

    for (auto const& info : supported_types)
    {
        std::string extension;
        std::string format;
        std::tie(extension, format) = info;
        std::string filename = (boost::format(directory_name + "mapnik-%1%.%2%") % named_color % extension).str();
        mapnik::save_to_file(im, filename);
        std::string str = mapnik::save_to_string(im, format);
        std::ostringstream ss;
        mapnik::save_to_stream(im, ss, format);
        CHECK(str.length() == ss.str().length());
        // wrap reader in scope to ensure the file handle is
        // released before we try to remove the file
        {
            std::unique_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(filename, extension));
            unsigned w = reader->width();
            unsigned h = reader->height();
            auto im2 = reader->read(0, 0, w, h);
            CHECK(im2.size() == im.size());
            if (extension == "png" || extension == "tiff")
            {
                CHECK(0 == std::memcmp(im2.bytes(), im.bytes(), im.width() * im.height()));
            }
        }
        if (mapnik::util::exists(filename))
        {
            mapnik::util::remove(filename);
        }
    }
}

SECTION("Quantising small (less than 3 pixel images preserve original colours")
{
#if defined(HAVE_PNG)
    { // 1x1
        mapnik::image_rgba8 im(1,1); // 1 pixel
        im(0,0) = mapnik::color("green").rgba();
        check_tiny_png_image_quantising(im);
    }
    { // 1x2
        mapnik::image_rgba8 im(1,2); // 2 pixels
        mapnik::fill(im, mapnik::color("red").rgba());
        im(0,0) = mapnik::color("green").rgba();
        check_tiny_png_image_quantising(im);
    }
    { // 2x1
        mapnik::image_rgba8 im(2,1); // 2 pixels
        mapnik::fill(im, mapnik::color("red").rgba());
        im(0,0) = mapnik::color("green").rgba();
        check_tiny_png_image_quantising(im);
    }
#endif
} // END SECTION

} // END TEST_CASE