mapnik/benchmark/include/compare_images.hpp

#ifndef MAPNIK_COMPARE_IMAGES_HPP
#define MAPNIK_COMPARE_IMAGES_HPP

#include <mapnik/image.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_reader.hpp>


namespace benchmark {

    bool compare_images(std::string const& src_fn,std::string const& dest_fn)
    {
        std::unique_ptr<mapnik::image_reader> reader1(mapnik::get_image_reader(dest_fn,"png"));
        if (!reader1.get())
        {
            throw mapnik::image_reader_exception("Failed to load: " + dest_fn);
        }

        std::unique_ptr<mapnik::image_reader> reader2(mapnik::get_image_reader(src_fn,"png"));
        if (!reader2.get())
        {
            throw mapnik::image_reader_exception("Failed to load: " + src_fn);
        }

        const mapnik::image_any desc_any = reader1->read(0,0,reader1->width(), reader1->height());
        const mapnik::image_any src_any = reader2->read(0,0,reader2->width(), reader2->height());

        mapnik::image_rgba8 const& dest = mapnik::util::get<mapnik::image_rgba8>(desc_any);
        mapnik::image_rgba8 const& src = mapnik::util::get<mapnik::image_rgba8>(src_any);

        return compare(dest, src, 0, true) == 0;
    }

}

#endif // MAPNIK_COMPARE_IMAGES_HPP