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id="validation-8de597b0-9556-4f7b-b5b5-1f5ff24b6f68" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> <svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill"> <path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2">Search syntax tips</a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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dir=\"auto\"\u003erustybuzz\u003c/h1\u003e\u003ca id=\"user-content-rustybuzz\" class=\"anchor\" aria-label=\"Permalink: rustybuzz\" href=\"#rustybuzz\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/harfbuzz/rustybuzz/workflows/Rust/badge.svg\"\u003e\u003cimg src=\"https://github.com/harfbuzz/rustybuzz/workflows/Rust/badge.svg\" alt=\"Build Status\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://crates.io/crates/rustybuzz\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/ff85216cad5acede5ebd144921fdaacc7008284acdd890f4010689597fcafde7/68747470733a2f2f696d672e736869656c64732e696f2f6372617465732f762f727573747962757a7a2e737667\" alt=\"Crates.io\" data-canonical-src=\"https://img.shields.io/crates/v/rustybuzz.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://docs.rs/rustybuzz\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/5917f4faba6e8413c9a46b645b9649492057cbe06662709b88426c606335ea47/68747470733a2f2f646f63732e72732f727573747962757a7a2f62616467652e737667\" alt=\"Documentation\" data-canonical-src=\"https://docs.rs/rustybuzz/badge.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erustybuzz\u003c/code\u003e is a complete \u003ca href=\"https://github.com/harfbuzz/harfbuzz\"\u003eharfbuzz\u003c/a\u003e's\nshaping algorithm port to Rust.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMatches \u003ccode\u003eharfbuzz\u003c/code\u003e v10.1.0.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhy?\u003c/h2\u003e\u003ca id=\"user-content-why\" class=\"anchor\" aria-label=\"Permalink: Why?\" href=\"#why\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBecause you can add \u003ccode\u003erustybuzz = \"*\"\u003c/code\u003e to your project and it just works.\nNo need for a C++ compiler. No need to configure anything. No need to link to system libraries.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConformance\u003c/h2\u003e\u003ca id=\"user-content-conformance\" class=\"anchor\" aria-label=\"Permalink: Conformance\" href=\"#conformance\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003erustybuzz passes nearly all of harfbuzz shaping tests (2221 out of 2252 to be more precise).\nSo it's mostly identical, but there are still some tiny edge-cases which\nare not implemented yet or cannot be implemented at all.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMajor changes\u003c/h2\u003e\u003ca id=\"user-content-major-changes\" class=\"anchor\" aria-label=\"Permalink: Major changes\" href=\"#major-changes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSubsetting removed.\u003c/li\u003e\n\u003cli\u003eTrueType parsing is completely handled by the\n\u003ca href=\"https://github.com/RazrFalcon/ttf-parser\"\u003ettf-parser\u003c/a\u003e.\nAnd while the parsing algorithm is very different, it's not better or worse, just different.\u003c/li\u003e\n\u003cli\u003eMalformed fonts will cause an error. HarfBuzz uses fallback/dummy shaper in this case.\u003c/li\u003e\n\u003cli\u003eNo font size property. Shaping is always using UnitsPerEm. You should scale the result manually.\u003c/li\u003e\n\u003cli\u003eMost of the TrueType and Unicode handling code was moved into separate crates.\u003c/li\u003e\n\u003cli\u003erustybuzz doesn't provide any integration with external libraries, so no FreeType, CoreText, or Uniscribe/DirectWrite font-loading integration, and no ICU, or GLib Unicode-functions integration, as well as no \u003ccode\u003egraphite2\u003c/code\u003e library support.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003emort\u003c/code\u003e table is not supported, since it's deprecated by Apple.\u003c/li\u003e\n\u003cli\u003eNo Arabic fallback shaper. This requires the ability to build lookups on the fly. In HarfBuzz (C++) this requires serialization code that is associated with subsetting.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eavar2\u003c/code\u003e as well as other parts of the boring-expansion-spec are not supported yet.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePerformance\u003c/h2\u003e\u003ca id=\"user-content-performance\" class=\"anchor\" aria-label=\"Permalink: Performance\" href=\"#performance\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAt the moment, performance isn't that great. We're 1.5-2x slower than harfbuzz.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"/harfbuzz/rustybuzz/blob/main/benches/README.md\"\u003ebenches/README.md\u003c/a\u003e for details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNotes about the port\u003c/h2\u003e\u003ca id=\"user-content-notes-about-the-port\" class=\"anchor\" aria-label=\"Permalink: Notes about the port\" href=\"#notes-about-the-port\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003erustybuzz is not a faithful port.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eharfbuzz can roughly be split into 6 parts: shaping, subsetting, TrueType parsing,\nUnicode routines, custom containers and utilities (harfbuzz doesn't use C++ std)\nand glue for system/3rd party libraries. In the mean time, rustybuzz contains only shaping.\nAll of the TrueType parsing was moved to the \u003ca href=\"https://github.com/RazrFalcon/ttf-parser\"\u003ettf-parser\u003c/a\u003e.\nSubsetting was removed. Unicode code was mostly moved to external crates.\nWe don't need custom containers because Rust's std is good enough.\nAnd we do not use any non Rust libraries, so no glue code either.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn the end, we still have around 23 KLOC. While harfbuzz is around 80 KLOC.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLines of code\u003c/h2\u003e\u003ca id=\"user-content-lines-of-code\" class=\"anchor\" aria-label=\"Permalink: Lines of code\" href=\"#lines-of-code\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAs mentioned above, rustybuzz has around 23 KLOC. But this is not strictly true,\nbecause there are a lot of auto-generated data tables.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou can find the \"real\" code size using:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"tokei --exclude hb/unicode_norm.rs --exclude hb/ot_shaper_vowel_constraints.rs \\\n --exclude '*_machine.rs' --exclude '*_table.rs' src\"\u003e\u003cpre\u003etokei --exclude hb/unicode_norm.rs --exclude hb/ot_shaper_vowel_constraints.rs \\\n --exclude \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003e*_machine.rs\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003e\u003c/span\u003e --exclude \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003e*_table.rs\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003e\u003c/span\u003e src\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhich gives us around 17 KLOC, which is still a lot.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFuture work\u003c/h2\u003e\u003ca id=\"user-content-future-work\" class=\"anchor\" aria-label=\"Permalink: Future work\" href=\"#future-work\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSince the port is finished, there is not much to do other than syncing it with\na new harfbuzz releases. However, there is still lots of potential areas of improvement:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cstrong\u003eWider test coverage\u003c/strong\u003e: Currently, we only test the result of the positioned glyphs in the shaping output.\nWe should add tests so that we can test other parts of the API as well, such as glyph extents and glyph flags.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eFuzzing against harfbuzz\u003c/strong\u003e: While \u003ccode\u003erustybuzz\u003c/code\u003e passes the whole \u003ccode\u003eharfbuzz\u003c/code\u003e test suite, this does not mean that\noutput will always be 100% identical to \u003ccode\u003eharfbuzz\u003c/code\u003e. Given the complexity of the code base, there are bound to be\nother bugs that just have not been discovered yet. One potential way of addressing this issue could be to create a\nfuzzer that takes random fonts, and shapes them with a random set of Unicode codepoints as well as\ninput settings. In case of a discovered discrepancy, this test case could then be investigated and once the\nbug has been identified, added to our custom test suite. On the one hand we could use the Google Fonts font\ncollection for this so that the fonts can be added to the repository,\nbut we could also just use MacOS/Windows system fonts and only test them in CI, similarly\nto how it's currently done for AAT in \u003ccode\u003eharfbuzz\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003ePerformance\u003c/strong\u003e: \u003ccode\u003eharfbuzz\u003c/code\u003e contains tons of optimization structures\n(accelerators and caches) which have not been included in \u003ccode\u003erustybuzz\u003c/code\u003e. As a result of this,\nperformance is much worse in many cases, as mentioned above (although in the grand scheme of things\n\u003ccode\u003erustybuzz\u003c/code\u003e is still very performant), but the upside of excluding all those optimizations is that\nthe code base is much simpler and straightforward. This makes it a lot easier to backport new changes\n(which already is a very difficult task). Now that we are back in sync with \u003ccode\u003eharfbuzz\u003c/code\u003e, we can consider\nattempting to port some of the major optimization improvements from \u003ccode\u003eharfbuzz\u003c/code\u003e, but we should do so carefully\nto not make it even harder to keep the code bases in sync.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eCode alignment\u003c/strong\u003e: \u003ccode\u003erustybuzz\u003c/code\u003e tries its best to make the code base look like a 1:1 C++ to Rust translation,\nwhich is the case for most parts of the code, but there also are many variations (most notable in AAT) that arise\nfrom the fact that a lot of the C++ concepts are not straightforward to port. Nevertheless, there probably still\nare parts of the code that probably could be made more similar, given that someone puts time into looking into that.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eAll of this is a lot of work, so contributions are more than welcome.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSafety\u003c/h2\u003e\u003ca id=\"user-content-safety\" class=\"anchor\" aria-label=\"Permalink: Safety\" href=\"#safety\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe library is completely safe.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe do have one \u003ccode\u003eunsafe\u003c/code\u003e to cast between two POD structures, which is perfectly safe.\nBut except that, there are no \u003ccode\u003eunsafe\u003c/code\u003e in this library and in most of its dependencies\n(excluding \u003ccode\u003ebytemuck\u003c/code\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAlternatives\u003c/h2\u003e\u003ca id=\"user-content-alternatives\" class=\"anchor\" aria-label=\"Permalink: Alternatives\" href=\"#alternatives\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://crates.io/crates/harfbuzz_rs\" rel=\"nofollow\"\u003eharfbuzz_rs\u003c/a\u003e - bindings to the actual harfbuzz library.\nAs of v2 doesn't expose subsetting and glyph outlining, which harfbuzz supports.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/yeslogic/allsorts\"\u003eallsorts\u003c/a\u003e - shaper and subsetter.\nAs of v0.6 doesn't support variable fonts and\n\u003ca href=\"https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6AATIntro.html\" rel=\"nofollow\"\u003eApple Advanced Typography\u003c/a\u003e.\nRelies on some unsafe code.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/dfrg/swash\"\u003eswash\u003c/a\u003e - Supports variable fonts, text layout and rendering.\nNo subsetting. Relies on some unsafe code. As of v0.1.4 has zero tests.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h2\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erustybuzz\u003c/code\u003e is licensed under the \u003cstrong\u003eMIT\u003c/strong\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eharfbuzz\u003c/code\u003e is \u003ca href=\"https://github.com/harfbuzz/harfbuzz/blob/main/COPYING\"\u003elicensed\u003c/a\u003e under the \u003cstrong\u003eOld MIT\u003c/strong\u003e\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"rustybuzz","anchor":"rustybuzz","htmlText":"rustybuzz"},{"level":2,"text":"Why?","anchor":"why","htmlText":"Why?"},{"level":2,"text":"Conformance","anchor":"conformance","htmlText":"Conformance"},{"level":2,"text":"Major changes","anchor":"major-changes","htmlText":"Major changes"},{"level":2,"text":"Performance","anchor":"performance","htmlText":"Performance"},{"level":2,"text":"Notes about the port","anchor":"notes-about-the-port","htmlText":"Notes about the port"},{"level":2,"text":"Lines of code","anchor":"lines-of-code","htmlText":"Lines of code"},{"level":2,"text":"Future work","anchor":"future-work","htmlText":"Future 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js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">rustybuzz</h1><a id="user-content-rustybuzz" class="anchor" aria-label="Permalink: rustybuzz" href="#rustybuzz"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a target="_blank" rel="noopener noreferrer" href="https://github.com/harfbuzz/rustybuzz/workflows/Rust/badge.svg"><img src="https://github.com/harfbuzz/rustybuzz/workflows/Rust/badge.svg" alt="Build Status" style="max-width: 100%;"></a> <a href="https://crates.io/crates/rustybuzz" rel="nofollow"><img src="https://camo.githubusercontent.com/ff85216cad5acede5ebd144921fdaacc7008284acdd890f4010689597fcafde7/68747470733a2f2f696d672e736869656c64732e696f2f6372617465732f762f727573747962757a7a2e737667" alt="Crates.io" data-canonical-src="https://img.shields.io/crates/v/rustybuzz.svg" style="max-width: 100%;"></a> <a href="https://docs.rs/rustybuzz" rel="nofollow"><img src="https://camo.githubusercontent.com/5917f4faba6e8413c9a46b645b9649492057cbe06662709b88426c606335ea47/68747470733a2f2f646f63732e72732f727573747962757a7a2f62616467652e737667" alt="Documentation" data-canonical-src="https://docs.rs/rustybuzz/badge.svg" style="max-width: 100%;"></a></p> <p dir="auto"><code>rustybuzz</code> is a complete <a href="https://github.com/harfbuzz/harfbuzz">harfbuzz</a>'s shaping algorithm port to Rust.</p> <p dir="auto">Matches <code>harfbuzz</code> v10.1.0.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Why?</h2><a id="user-content-why" class="anchor" aria-label="Permalink: Why?" href="#why"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Because you can add <code>rustybuzz = "*"</code> to your project and it just works. No need for a C++ compiler. No need to configure anything. No need to link to system libraries.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Conformance</h2><a id="user-content-conformance" class="anchor" aria-label="Permalink: Conformance" href="#conformance"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">rustybuzz passes nearly all of harfbuzz shaping tests (2221 out of 2252 to be more precise). So it's mostly identical, but there are still some tiny edge-cases which are not implemented yet or cannot be implemented at all.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Major changes</h2><a id="user-content-major-changes" class="anchor" aria-label="Permalink: Major changes" href="#major-changes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Subsetting removed.</li> <li>TrueType parsing is completely handled by the <a href="https://github.com/RazrFalcon/ttf-parser">ttf-parser</a>. And while the parsing algorithm is very different, it's not better or worse, just different.</li> <li>Malformed fonts will cause an error. HarfBuzz uses fallback/dummy shaper in this case.</li> <li>No font size property. Shaping is always using UnitsPerEm. You should scale the result manually.</li> <li>Most of the TrueType and Unicode handling code was moved into separate crates.</li> <li>rustybuzz doesn't provide any integration with external libraries, so no FreeType, CoreText, or Uniscribe/DirectWrite font-loading integration, and no ICU, or GLib Unicode-functions integration, as well as no <code>graphite2</code> library support.</li> <li><code>mort</code> table is not supported, since it's deprecated by Apple.</li> <li>No Arabic fallback shaper. This requires the ability to build lookups on the fly. In HarfBuzz (C++) this requires serialization code that is associated with subsetting.</li> <li><code>avar2</code> as well as other parts of the boring-expansion-spec are not supported yet.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Performance</h2><a id="user-content-performance" class="anchor" aria-label="Permalink: Performance" href="#performance"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">At the moment, performance isn't that great. We're 1.5-2x slower than harfbuzz.</p> <p dir="auto">See <a href="/harfbuzz/rustybuzz/blob/main/benches/README.md">benches/README.md</a> for details.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Notes about the port</h2><a id="user-content-notes-about-the-port" class="anchor" aria-label="Permalink: Notes about the port" href="#notes-about-the-port"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">rustybuzz is not a faithful port.</p> <p dir="auto">harfbuzz can roughly be split into 6 parts: shaping, subsetting, TrueType parsing, Unicode routines, custom containers and utilities (harfbuzz doesn't use C++ std) and glue for system/3rd party libraries. In the mean time, rustybuzz contains only shaping. All of the TrueType parsing was moved to the <a href="https://github.com/RazrFalcon/ttf-parser">ttf-parser</a>. Subsetting was removed. Unicode code was mostly moved to external crates. We don't need custom containers because Rust's std is good enough. And we do not use any non Rust libraries, so no glue code either.</p> <p dir="auto">In the end, we still have around 23 KLOC. While harfbuzz is around 80 KLOC.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Lines of code</h2><a id="user-content-lines-of-code" class="anchor" aria-label="Permalink: Lines of code" href="#lines-of-code"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">As mentioned above, rustybuzz has around 23 KLOC. But this is not strictly true, because there are a lot of auto-generated data tables.</p> <p dir="auto">You can find the "real" code size using:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="tokei --exclude hb/unicode_norm.rs --exclude hb/ot_shaper_vowel_constraints.rs \ --exclude '*_machine.rs' --exclude '*_table.rs' src"><pre>tokei --exclude hb/unicode_norm.rs --exclude hb/ot_shaper_vowel_constraints.rs \ --exclude <span class="pl-s"><span class="pl-pds">'</span>*_machine.rs<span class="pl-pds">'</span></span> --exclude <span class="pl-s"><span class="pl-pds">'</span>*_table.rs<span class="pl-pds">'</span></span> src</pre></div> <p dir="auto">Which gives us around 17 KLOC, which is still a lot.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Future work</h2><a id="user-content-future-work" class="anchor" aria-label="Permalink: Future work" href="#future-work"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Since the port is finished, there is not much to do other than syncing it with a new harfbuzz releases. However, there is still lots of potential areas of improvement:</p> <ul dir="auto"> <li><strong>Wider test coverage</strong>: Currently, we only test the result of the positioned glyphs in the shaping output. We should add tests so that we can test other parts of the API as well, such as glyph extents and glyph flags.</li> <li><strong>Fuzzing against harfbuzz</strong>: While <code>rustybuzz</code> passes the whole <code>harfbuzz</code> test suite, this does not mean that output will always be 100% identical to <code>harfbuzz</code>. Given the complexity of the code base, there are bound to be other bugs that just have not been discovered yet. One potential way of addressing this issue could be to create a fuzzer that takes random fonts, and shapes them with a random set of Unicode codepoints as well as input settings. In case of a discovered discrepancy, this test case could then be investigated and once the bug has been identified, added to our custom test suite. On the one hand we could use the Google Fonts font collection for this so that the fonts can be added to the repository, but we could also just use MacOS/Windows system fonts and only test them in CI, similarly to how it's currently done for AAT in <code>harfbuzz</code>.</li> <li><strong>Performance</strong>: <code>harfbuzz</code> contains tons of optimization structures (accelerators and caches) which have not been included in <code>rustybuzz</code>. As a result of this, performance is much worse in many cases, as mentioned above (although in the grand scheme of things <code>rustybuzz</code> is still very performant), but the upside of excluding all those optimizations is that the code base is much simpler and straightforward. This makes it a lot easier to backport new changes (which already is a very difficult task). Now that we are back in sync with <code>harfbuzz</code>, we can consider attempting to port some of the major optimization improvements from <code>harfbuzz</code>, but we should do so carefully to not make it even harder to keep the code bases in sync.</li> <li><strong>Code alignment</strong>: <code>rustybuzz</code> tries its best to make the code base look like a 1:1 C++ to Rust translation, which is the case for most parts of the code, but there also are many variations (most notable in AAT) that arise from the fact that a lot of the C++ concepts are not straightforward to port. Nevertheless, there probably still are parts of the code that probably could be made more similar, given that someone puts time into looking into that.</li> </ul> <p dir="auto">All of this is a lot of work, so contributions are more than welcome.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Safety</h2><a id="user-content-safety" class="anchor" aria-label="Permalink: Safety" href="#safety"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The library is completely safe.</p> <p dir="auto">We do have one <code>unsafe</code> to cast between two POD structures, which is perfectly safe. But except that, there are no <code>unsafe</code> in this library and in most of its dependencies (excluding <code>bytemuck</code>).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Alternatives</h2><a id="user-content-alternatives" class="anchor" aria-label="Permalink: Alternatives" href="#alternatives"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://crates.io/crates/harfbuzz_rs" rel="nofollow">harfbuzz_rs</a> - bindings to the actual harfbuzz library. As of v2 doesn't expose subsetting and glyph outlining, which harfbuzz supports.</li> <li><a href="https://github.com/yeslogic/allsorts">allsorts</a> - shaper and subsetter. As of v0.6 doesn't support variable fonts and <a href="https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6AATIntro.html" rel="nofollow">Apple Advanced Typography</a>. Relies on some unsafe code.</li> <li><a href="https://github.com/dfrg/swash">swash</a> - Supports variable fonts, text layout and rendering. No subsetting. Relies on some unsafe code. As of v0.1.4 has zero tests.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License</h2><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>rustybuzz</code> is licensed under the <strong>MIT</strong>.</p> <p dir="auto"><code>harfbuzz</code> is <a href="https://github.com/harfbuzz/harfbuzz/blob/main/COPYING">licensed</a> under the <strong>Old MIT</strong></p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="EF1y+hLIvxO7ybLEgpGHaNwASuA2qAoPWDauu2xI0KFNZ+oj3yCYkumraZOpCLzZqdPjx2YbJRYv/dG8KE8eTQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> A complete harfbuzz's shaping algorithm port to Rust </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/text-shaping" title="Topic: text-shaping" data-view-component="true" class="topic-tag topic-tag-link"> text-shaping </a> </div> 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