C++ exmaple convert svg to png with resvg library.

svg2png.cpp

#include <iostream>
#include <stb_image_write.h>
#include <resvg.h>

int main()
{
    resvg_options* opt = resvg_options_create();
    resvg_options_load_system_fonts(opt);

    resvg_render_tree* tree;
    int err = resvg_parse_tree_from_file("bboxes.svg", opt, &tree);
    resvg_options_destroy(opt);
    if (err == RESVG_OK)
    {
        resvg_size size = resvg_get_image_size(tree);
        int width = (int)size.width;
        int height = (int)size.height;

        resvg_fit_to fit_to = { RESVG_FIT_TO_TYPE_ORIGINAL, 1 };
        char* pData = new char[width * height * 4];
        memset(pData, 0, width * height * 4);//default alhpa=0 and color=black
        resvg_render(tree, fit_to, resvg_transform_identity(), width, height, (char*)pData);//RGBA

        err = stbi_write_png("bboxes.svg.png", width, height, 4, pData, width * 4);

        delete[] pData;
    }
    else
    {
		std::cout << "Error id: " << err << std::endl;
    }

    return 0;
}