SVGs at higher densities can result in librsvg/libvips overcomputation

What is the output of running npx envinfo --binaries --languages --system --utilities?

System:
    OS: Linux 4.15 Ubuntu 16.04.6 LTS (Xenial Xerus)
    CPU: (4) x64 Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
    Memory: 584.79 MB / 7.67 GB
    Container: Yes
    Shell: 5.1.1 - /usr/bin/zsh
  Binaries:
    Node: 12.10.0 - /usr/bin/node
    npm: 6.11.2 - ~/.npm-global/bin/npm
  Utilities:
    Make: 4.1 - /usr/bin/make
    GCC: 5.4.0 - /usr/bin/gcc
    Git: 2.7.4 - /usr/bin/git
  Languages:
    Bash: 4.3.48 - /bin/bash
    Perl: 5.22.1 - /usr/bin/perl
    Python: 2.7.12 - /usr/bin/python

What are the steps to reproduce?

take SVG

and this code snippet

sharp('svgs/1.svg', { density: 2400 })
  .resize({ width: 180, height: 180 })
  .toFile('output.png', (err, info) => {
    if (err) console.log('err', err);
    console.log('done');
  });

What is the expected behaviour?

Successfull convertion and resizing.

Are you able to provide a standalone code sample, without other dependencies, that demonstrates this problem?

Yes, above

Are you able to provide a sample image that helps explain the problem?

<svg xmlns="http://www.w3.org/2000/svg" height="203.06" viewBox="0 0 250 203.0594" width="250"><g transform="matrix(1.25 0 0 -1.25 -125.48 427.68)"><g transform="matrix(2.2671 0 0 2.2671 -252.3 -328.71)"><path d="m199.44 224.64-5.8 7.532c-7.379 2.435-12.515 9.104-12.99 16.862l-4.021 3.896c-3.421-1.474-6.425-3.035-6.425-3.035l-10.79 10.83 4.548 9.97-8.133 10.562h12.939l2.505 5.455 6.406 2.585 0.711 1.933 5.192-2.372 1.235 4.315 0.847 0.282c4.107 1.368 8.84 2.105 13.685 2.132 0.139 0.009 1.679-0.018 1.715-0.018 0.181 0 0.937-0.041 0.937-0.041 4.099-0.198 7.949-0.88 11.445-2.028l0.859-0.283 1.137-4.115 1.869 1.412 10.495-3.731 2.532-5.528h13.004l-8.22-10.605 4.479-9.827-10.959-11.284s-3.977 2.492-6.731 3.585l-3.345-3.821c-0.377-7.943-5.782-14.91-13.378-17.249l-5.748-7.414z" fill="#fff"/><path d="m55.564 3.0859-0.05078 4.4883 0.8125 0.83008 0.26953 0.019531 0.01367 1.9336 1.3438 0.03906-0.03711-1.9297 0.25195-0.013672 0.75976-0.75781-0.16211-4.5137c-0.37125-0.03125-1.1992-0.058594-1.1992-0.058594l0.04687 4-0.78711 0.00586-0.01172-4.0234s-0.815-0.019531-1.25-0.019531zm-2.3945 0.10547c-0.45375 0.0275-0.72414 0.019922-1.2441 0.076172l-0.44336 5.5938-0.86914 0.078125 0.50781-5.6172-1.2188 0.11914-0.69141 5.6582-0.88477 0.097656 0.66602-5.6465-1.2363 0.16992-0.94141 6.3945 0.7168 0.68359 1.6348-0.15234 0.70508-0.59961 0.55664 0.48438 1.502-0.08984 0.875-0.87109 0.36523-6.3789zm7.3359 0.10938c-0.2425 0.2625-0.55266 0.47133-0.75391 0.73633 0.115 1.8788 0.21031 3.7634 0.35156 5.6309l0.79492 0.86523 2.2031 0.14844 0.68164-1.041c-0.185-1.7088-0.48758-3.4637-0.64258-5.2949l-0.799-0.8653-1.836-0.1797zm3.666 0.41406 0.97266 7.1758 1.4648 0.18164-0.3125-2.1074 0.88086 0.097656 0.40039 2.1621 1.4688 0.25391l-0.444-2.5942-0.514-0.6133 0.291-0.4043-0.504-2.6113-0.906-1.0469-2.799-0.4942zm-17.315 0.1367-2.882 0.5859c-0.2875 1.655-1.4453 7.0176-1.4453 7.0176 1.0338-0.18 2.1171-0.3343 3.1934-0.4668 0.0775-0.445 0.23047-1.4414 0.23047-1.4414l-1.5391 0.22461 0.2832-1.4785 1.5-0.21484c0.1-0.545 0.1275-0.74141 0.21875-1.3164-0.652 0.0862-0.987 0.1394-1.536 0.2382l0.27148-1.5449 1.4941-0.28125 0.21094-1.3223zm22.018 0.789s0.96359 4.6963 1.4961 7.0801l1.5273 0.29883-0.51172-2.2129 0.93945 0.21094 0.58789 2.2227 1.5078 0.33789-0.91602-3.1699-0.60352-0.66406 0.32617-0.46875-0.69531-2.6035c-0.69-0.20875-1.3379-0.39062-1.3379-0.39062l0.65234 2.6875-0.25195 0.34766-0.52344-0.10547c0-0.0003-0.537-2.1612-0.81-3.2112-0.613-0.1975-1.387-0.3594-1.387-0.3594zm-7.7871 0.013672 0.75195 0.083984 0.41211 4.3438-0.77344-0.060547-0.39062-4.3672zm-18.25 0.025391c-0.485 0.10875-1.4492 0.36523-1.4492 0.36523l-0.36914 1.4277s-0.41008-0.77516-0.58008-1.1602c-0.4625 0.13875-0.8525 0.25734-1.375 0.43359-0.635 2.2788-1.2842 4.5584-1.918 6.8359l1.523-0.348 1.225-4.2067 0.484 1.0489-0.715 2.9238 1.559-0.307 1.615-7.0133zm22.922 0.666 0.74 0.1367 0.348 1.7793-0.828-0.0957-0.26-1.8203zm-60.342 15.679 50.258 65.235 50.594-65.233-100.85-0.002z" transform="matrix(.8 0 0 -.8 154.9 296.4)" fill="#006bb6"/><path d="m236.83 278.07-37.385-48.203-37.138 48.204 74.523-0.001z" fill="#bec0c2"/><path d="m231.44 274.71-0.013 0.032-0.028 0.018-2.393 1.608 0.891 1.702 0.027 0.052-0.024 0.054-3.293 7.216-0.022 0.044-0.046 0.017-8.875 3.161-0.061 0.022-0.053-0.04-2.354-1.796-0.024-0.019-0.012-0.03-0.404-0.988s-3.679 0.924-9.083 1.464c-0.551 0.055-2.021 0.176-4.369 0.361l-0.228 0.018-0.237 0.018-0.055 0.004-0.039-0.039-1.754-1.747 0.002 1.794s-4.975-0.281-8.233-0.724c-3.257-0.444-6.462-1.25-6.462-1.25l-0.589 1.262-0.019 0.04-0.039 0.018-4.188 1.917-0.118 0.053-0.044-0.121-0.488-1.326-0.11 0.266-0.046 0.109-0.11-0.045-5.993-2.402-0.044-0.019-0.021-0.044-11.055-24.288 9.077-9.09 0.423 0.24c0.273 0.156 0.66 0.386 1.098 0.642 1.098 0.648 2.602 1.533 3.32 1.88l0.147 0.07c0.929 0.449 1.396 0.676 5.808 2.564l0.369 0.138c0.004 0.001 0.495 0.192 1.404 0.493 2.423 0.806 8.717 2.679 14.817 2.679h0.069c0.244 0 0.486-0.004 0.73-0.011 4.143-0.114 8.986-0.995 12.318-1.712 3.207-0.692 5.62-1.356 6.306-1.549l0.461-0.142c3.034-1.172 6.745-3.109 10.181-5.31l0.437-0.281 9.188 9.462-6.147 13.555z" fill="#006bb6"/><path d="m55.418 32.451 0.0332 4.4668 1.8379 0.06641 0.04102-2.5469-1.9121-1.9863zm2.6992 2.3066c-0.0375 0.7475-0.03789 1.7991-0.08789 2.3516 1.2888 0.15125 2.6684 0.57406 3.8809 0.91406 1.0975 0.265 2.2779 0.73602 3.2441 1.166l0.53125-3.8457c-2.548-0.314-4.96-0.505-7.568-0.586zm-5.5117 0.0059c-1.7388 0.05875-3.4659 0.16758-5.1797 0.33008 0.14875 0.975 0.37164 2.4323 0.52539 3.4473 0 0 1.5846-0.92805 4.7559-1.2793l-0.10156-2.498zm-8.3184 0.68164c-1.6912 0.22375-3.3673 0.50172-5.0273 0.82422 0.63625 2.0688 1.447 4.8455 2.082 6.9355 1.4762-1.0988 2.3642-2.2276 3.918-3.1738-0.295-1.3975-0.68641-3.2059-0.97266-4.5859zm23.057 0.09961-0.9043 4.418c1.44 0.83375 2.5621 1.7761 3.8496 3.0273l0.25195 0.19336 2.0293-6.7109c-1.7475-0.36125-3.4441-0.67648-5.2266-0.92773zm-31.871 1.5469c-1.8988 0.45875-3.5504 0.94164-5.4004 1.5254 1.17 2.7812 2.4791 5.647 3.8691 8.3145 1.2625-0.465 3.0237-1.1003 4.6699-1.5391l-3.1387-8.3008zm40.662 0.19922-3.2949 8.5039 4.834 1.1367 4.0684-8.043c-1.875-0.61125-3.6849-1.1164-5.6074-1.5977zm-49.16 2.3457c-2.0475 0.73125-3.9106 1.4879-5.8906 2.3691l5.5645 7.9141c0.27875-0.24 3.0236-1.425 4.9023-2.2188-1.4275-2.585-3.1449-5.4345-4.5762-8.0645zm57.717 0.27734-4.457 8.0137c3.8512 1.495 9.2364 4.5124 11.379 5.9512 0.9875-0.945 6.3458-6.5693 7.082-7.3418-4.455-2.6138-9.1352-4.8355-14.004-6.623zm-68.486 4.418c-1.22 0.6325-2.4238 1.2963-3.6113 1.9863l7.209 7.2324c0.87375-0.525 1.7996-1.0604 2.8184-1.6504l-6.416-7.5684z" transform="matrix(.8 0 0 -.8 154.9 296.4)" fill="#bec0c2"/><path d="m199.6 267.52c-9.562-0.001-17.312-7.752-17.312-17.314 0-9.56 7.75-17.31 17.312-17.31 9.561 0 17.312 7.75 17.312 17.31 0 9.562-7.751 17.313-17.312 17.314" fill="#006bb6"/><path d="m31.41 11.426-3.0352 8.6328-4.8652 4.1895 4.4336-11.193-4.7656 1.9023-13.137 28.822 2.0547 2.0605c1.2188-0.71125 2.4552-1.3937 3.709-2.0449l4.1875-10.639 3.6758-3.2852 0.87891 1.0234-3.6309 10.443c1.985-0.875 4.0061-1.6761 6.0586-2.4023l2.6328-8.6113-2.2715-3.75 4.7031-4.4707 2.75-9.1602-3.3789-1.5176zm47.221 0.04687-1.8008 1.3906 3.2617 10.596 10.496 7.416 2.6895 6.7051-4.3652-1.9688-1.498-4.1738-5.3535-1.5762 2.8633 9.4297c0.8825 0.325 1.7582 0.66117 2.627 1.0137 2.3825 0.96375 4.7168 2.0317 6.998 3.1992 1.5812 0.80875 3.1346 1.6659 4.6621 2.5684l2.2813-2.3398-7.0625-15.57-11.035-7.3672-1.9199-5.3906 3.416 1.2148 1.3828 3.3691 5.1953 1.666-3.0312-6.6992-9.8066-3.4824zm-20.652 1.1211-2.3848 2.3809-0.0078 16.557 2.5039 2.5625c2.5825 0.08 5.1391 0.27312 7.6641 0.57812l-0.51758-4.7246-4.6777-0.27734-0.75195-13.242 3.9648 0.19336-0.46484-3.6465-5.3281-0.38086zm-4.6953 0.0098-4.0293 0.21094-1.8926 21.621c1.7112-0.1625 3.4363-0.27328 5.1738-0.33203l0.74805-21.5zm-6.3965 0.49609-3.7422 0.54492-1.2266 7.0996-1.3906-6.6816-4.3984 1.1016-6.1211 22.762c1.765-0.55125 3.5499-1.0469 5.3574-1.4844l3.3633-15.305 1.6895 8.2188-1.0918 6.2285c1.6338-0.31375 3.2823-0.58273 4.9473-0.80273l0.0098-0.002 2.6035-21.68zm17.742 0.0332s1.9105 14.577 2.8105 21.758c1.7238 0.24375 3.4305 0.54242 5.123 0.88867l-1.3203-7.0273 1.3164-1.7773 1.9238 1.582 1.7695 8.0625c1.8575 0.46625 3.6927 0.99383 5.5039 1.5801l-3.302-11.825-3.4043-2.7832 1.9375-2.5859-1.6113-6.002-4.1074-0.91211 1.6152 6.041-2.5586 3.4199-1.8926-9.9375-3.8047-0.48242zm-9.3203 24.574c-1.872 0.04131-3.6785 0.26711-5.3848 0.88867 0.73125 0.47125 1.3504 0.6357 2.4316 1.2832 1.585-0.73625 3.1845-1.5814 4.8457-2.1602-0.63781-0.01937-1.2686-0.02549-1.8926-0.01172zm3.9473 0.29492c-1.97 0.50375-5.7891 2.3223-5.7891 2.3223 6.4888 1.8162 14.136 1.4458 19.236 6.582-3.0125-4.8275-8.1435-8.0005-13.447-8.9043zm-10.59 1.0117c-1.8925 0.7725-3.9166 1.7797-5.3066 3.0547 2.1488 0.25 3.0692 0.38383 4.8242 0.86133 1.0488-0.9325 2.0637-1.7496 3.3262-2.5059l-2.8438-1.4102zm3.7832 1.7383c-1.21 0.74125-2.3897 1.6152-3.3984 2.5215 11.085 3.475 21.145 14.315 23.541 25.518 1.74-2.5112 2.7891-5.4251 3.2129-8.5176 0.27-4.7513 0.22375-9.0749-4.2812-13.201-5.3538-4.7238-12.815-4.1191-19.074-6.3203zm-10.174 2.1953c-1.97 1.7375-3.8293 4.396-4.7168 6.6348 1.8588-1.89 4.1731-3.4082 7.1094-2.752l0.02344 0.0078c0.83625-1.18 1.6351-2.192 2.7051-3.2207-1.9875-0.62-3.3061-0.59117-5.1211-0.66992zm6.0352 1.0176c-1.005 0.9825-1.8989 2.04-2.6914 3.1562l0.0039 0.0293c3.7175 1.6138 4.6932 5.5915 6.0957 10.865 1.8288 6.8725 3.5334 13.846 8.7109 19.215 2.9125-0.69375 5.9481-1.9776 8.7031-4.4551 0.85-0.85 2.119-2.0369 2.6465-2.8906-1.8088-11.296-12.381-22.792-23.469-25.92zm-4.8633 3.6738c-2.9114-0.05541-5.1137 2.1055-6.8516 4.5312-2.2612 7.9625 0.7432 16.164 5.7832 20.396-3.9-8.1125-3.2386-17.37 1.6602-24.887-0.20047-0.02398-0.3977-0.03732-0.5918-0.04102zm1.5684 0.3125c-5.215 7.3775-5.7072 18.731-0.49219 26.342 4.2112 2.665 9.4923 4.2629 14.822 3.1816-6.8375-7.905-7.4225-16.595-10.062-24.443-0.345-1.025-1.7276-4.3501-4.2676-5.0801z" transform="matrix(.8 0 0 -.8 154.9 296.4)" fill="#f58426"/></g></g></svg>

[jcupitt]

OK, merged to libvips master. Thank you for pointing out this issue, @bdrtsky !

[lovell]

v0.24.0 is now available with a prebuilt libvips v8.9.0. Thanks for reporting this!