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logo: refactor SVG sources (#536)
1. curl logos: - use original `OCRAStd.otf` glyph exports for characters (exported via FontForge). - use native SVG shapes (replacing paths) where possible. - use all-integer coordinates. - retain existing shapes losslessly. - rework/simplify minimization steps. - possible to edit them without a GUI editor. - possible to use individual colors for any element. New sizes (in bytes): curl-logo-master: 1630 (was: 8273) curl-logo: 1444 (657 w/ brotli q=11) (was: 2787) curl-symbol: 509 (was: 1092) curl-white-symbol: 473 (was: 1086) curl-up: 2428 (was: 7958) Could be minimized more by dropping newlines, but it hinders readability. Inspired-by: Йоте <https://social.net.ua/users/joter> 2. remaster wcurl logo: - reuse curl-logo glyphs as-is. - use shapes. - fix minor irregularities and minimization artifacts. - sync tray symbol thickness with the circle's. (it's less thick now than before.) - use all-integer coordinates. - add editable master copy. wcurl-logo size (in bytes): 1644 (was: 3301) 3. add the smallest SVG curl logo made by Йоте. via https://mastodon.social/@joter@social.net.ua/115861547891486989 More size reductions contributed by: - Йоте <https://social.net.ua/users/joter> https://mastodon.social/@joter@social.net.ua/115865310124914973 - erinaceus <https://chaos.social/@erinaceus> https://blog.strangerthanusual.de/blogposts/curl_logo_optimization https://mastodon.social/@erinaceus@chaos.social/115866618733709150 - @vszakats Also fix for the left slash (that added 4 .5 decimals). Currently at: 734 bytes, 717 /w svgo, 352 /w brotli q=11. Follow-up to 04a61ba #531
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‎.github/scripts/pyspelling.words‎

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epoll
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EPRT
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EPSV
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erinaceus
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ERRNO
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errno
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ESNI
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svcb
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SVG
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svg
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svgo
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Svyatoslav
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Swisscom
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sws

‎.github/workflows/pyspelling.yml‎

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persist-credentials: false
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- name: strip "uncheckable" sections from .md pages
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run: find docs -name '*.md' -print0 | xargs -0 -t -n1 .github/scripts/cleanspell.pl
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run: find docs logo -name '*.md' -print0 | xargs -0 -t -n1 .github/scripts/cleanspell.pl
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- name: 'install'
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run: |

‎logo/README.md‎

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|--------------------------------------------------|-------|------------|-----------------|
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| [curl-logo.jpg](curl-logo.jpg) | 80K | 2000 x 551 | JPEG |
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| [curl-logo.png](curl-logo.png) | 51K | 2000 x 551 | PNG |
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| [curl-logo-inkscape.svg](curl-logo-inkscape.svg) | 8K | vector | SVG |
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| [curl-logo.svg](curl-logo.svg) | 2.7K | vector | SVG |
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| [curl-logo-master.svg](curl-logo-master.svg) | 1.7K | vector | SVG |
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| [curl-logo.svg](curl-logo.svg) | 1.4K | vector | SVG |
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| [curl-transparent.png](curl-transparent.png) | 51K | 2000 x 551 | transparent PNG |
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## The curl symbol
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| File | Size | Resolution | Format |
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|------------------------------------------------------------|------|------------|-----------------|
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| [curl-symbol.jpg](curl-symbol.jpg) | 37K | 672 x 566 | JPEG |
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| [curl-symbol.png](curl-symbol.png) | 24K | 672 x 566 | PNG |
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| [curl-symbol-inkscape.svg](curl-symbol-inkscape.svg) | 4.6K | vector | SVG |
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| [curl-symbol.svg](curl-symbol.svg) | 1.1K | vector | SVG |
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| [curl-symbol-transparent.png](curl-symbol-transparent.png) | 24K | 672 x 566 | transparent PNG |
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| [curl-symbol.png](curl-symbol.png) | 23K | 672 x 566 | PNG |
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| [curl-symbol.svg](curl-symbol.svg) | 509 | vector | SVG |
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| [curl-symbol-transparent.png](curl-symbol-transparent.png) | 23K | 672 x 566 | transparent PNG |
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| [curl-white-symbol.svg](curl-white-symbol.svg) | 473 | vector | SVG (white) |
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## Smallest curl vector logo winner
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Caveat: not identical to the official logo.
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| File | Size | Resolution | Format |
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|------------------------------------------------------------|------|------------|-----------------|
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| [curl-logo-tiny.svg](curl-logo-tiny.svg) | 734 | vector | SVG |
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717 bytes with svgo, 352 with brotli q=11.
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Made by [Йоте](https://social.net.ua/users/joter) via <https://social.net.ua/notice/B25SxW3zQZFV1GDGbI>
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Further minimization by: [erinaceus](https://chaos.social/@erinaceus), vsz
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## curl up
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| File | Size | Resolution | Format |
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|----------------------------|------|------------|--------|
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| [curl-up.png](curl-up.png) | 63K | 2500 x 688 | PNG |
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| [curl-up.svg](curl-up.svg) | 7.8K | vector | SVG |
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| [curl-up.svg](curl-up.svg) | 2.5K | vector | SVG |
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## trurl
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<img src="wcurl-logo.svg" width=500>
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| File | Size | Resolution | Format |
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|----------------------------------|------|------------|--------|
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| [wcurl-logo.png](wcurl-logo.png) | 49K | 2000 x 501 | PNG |
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| [wcurl-logo.svg](wcurl-logo.svg) | 3.3K | vector | SVG |
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| File | Size | Resolution | Format |
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|------------------------------------------------|------|------------|--------|
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| [wcurl-logo.png](wcurl-logo.png) | 49K | 2000 x 501 | PNG |
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| [wcurl-logo-master.svg](wcurl-logo-master.svg) | 2.1K | vector | SVG |
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| [wcurl-logo.svg](wcurl-logo.svg) | 1.6K | vector | SVG |
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## curl logo colors
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‎logo/curl-logo-inkscape.svg‎

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‎logo/curl-logo-master.svg‎

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‎logo/curl-logo-render.sh‎

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#
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# SPDX-License-Identifier: curl
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# requires rsvg-convert, imagemagick, svgcleaner, svgo, jpegoptim, mozjpeg, advpng
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# requires rsvg-convert, imagemagick, svgo, jpegoptim, mozjpeg, advpng
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set -eu
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# curl-logo-inkscape.svg -> open in Inkscape, merge paths of the same color (Path -> Union), ungroup everything, save -> curl-logo-in.svg
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# curl-logo-master.svg -> open in Inkscape, merge 'curl' letter paths (Path -> Union), save -> curl-logo-in.svg
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f='curl-logo'
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if [ -f "$f"-in.svg ]; then
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svgcleaner "$f"-in.svg "$f"-tmp1.svg
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svgo --pretty --indent 1 "$f"-tmp1.svg
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mv "$f"-tmp1.svg "$f".svg
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sed -i.bak -E 's/ (height|width)="[0-9]+"//g' "$f".svg
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# edit result to remove evenodd group.
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svgo --pretty --indent 1 "$f"-in.svg
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mv "$f"-in.svg "$f".svg
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# manually optimize style="fill:#012345" to fill="#012345"
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fi
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rsvg-convert --width 2000 --keep-aspect-ratio curl-logo.svg --output curl-transparent.png
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rsvg-convert --width 2000 --keep-aspect-ratio curl-logo.svg --output curl-logo.png --background-color '#ffffff'
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magick curl-logo.png curl-logo.jpg
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# curl-symbol-inkscape.svg -> open in Inkscape, merge paths of the same color (Path -> Union), ungroup everything, save -> curl-symbol-in.svg
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f='curl-symbol'
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if [ -f "$f"-in.svg ]; then
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svgcleaner "$f"-in.svg "$f"-tmp1.svg
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svgo --pretty --indent 1 "$f"-tmp1.svg
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mv "$f"-tmp1.svg "$f".svg
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sed -i.bak -E 's/ (height|width)="[0-9]+"//g' "$f".svg
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# edit result to remove evenodd group.
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if [ ! -f curl-white-symbol.svg ]; then
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# Delete the redundant nested g stroke group after this
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sed -E 's/#[a-f0-9]{6}/#fff/g' < curl-symbol.svg > curl-white-symbol.svg
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fi
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sed -E 's/#[a-f0-9]{6}/#fff/g' < curl-symbol.svg > curl-white-symbol.svg
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rsvg-convert --width 672 --keep-aspect-ratio curl-symbol.svg --output curl-symbol-transparent.png
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rsvg-convert --width 672 --keep-aspect-ratio curl-symbol.svg --output curl-symbol.png --background-color '#ffffff'
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magick curl-symbol.png curl-symbol.jpg
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rsvg-convert --width 2500 --keep-aspect-ratio curl-up.svg --output curl-up.png
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# wcurl-logo-master.svg -> open in Inkscape, merge 'curl' letter paths (Path -> Union), save -> wcurl-logo-in.svg
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f='wcurl-logo'
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if [ -f "$f"-in.svg ]; then
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svgo --pretty --indent 1 "$f"-in.svg
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mv "$f"-in.svg "$f".svg
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# do the above one more time, then manually optimize style="fill:#012345" to fill="#012345"
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fi
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rsvg-convert --width 2000 --keep-aspect-ratio wcurl-logo.svg --output wcurl-logo.png
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# Further losslessly compress bitmaps:

‎logo/curl-logo-tiny.svg‎

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‎logo/curl-logo.jpg‎

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‎logo/curl-logo.png‎

-50 Bytes
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