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GitHub - ImageOptim/libimagequant: Palette quantization library that powers pngquant and other PNG optimizers
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17.9125 8.46625C18.6138 9.23625 19.04 10.2125 19.04 11.4225C19.04 15.6437 16.4688 16.5787 14.0213 16.8537C14.42 17.1975 14.7638 17.8575 14.7638 18.8887C14.7638 20.36 14.75 21.5425 14.75 21.9137C14.75 22.2025 14.9563 22.5462 15.5063 22.4362C19.8513 20.9787 23 16.8537 23 12C23 5.9225 18.0775 1 12 1Z"></path> </svg> </a> <div class="flex-1 flex-order-2 text-right"> <a href="/login?return_to=https%3A%2F%2Fgithub.com%2FImageOptim%2Flibimagequant" class="HeaderMenu-link HeaderMenu-button d-inline-flex d-lg-none flex-order-1 f5 no-underline border color-border-default rounded-2 px-2 py-1 color-fg-inherit js-prevent-focus-on-mobile-nav" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/ImageOptim/libimagequant","user_id":null}}" data-hydro-click-hmac="362d87541770e4b7bf84de9c2fd4874fc4e7acf2bb174a5a636683f9453dc4cd" data-analytics-event="{"category":"Marketing nav","action":"click to Sign in","label":"ref_page:Marketing;ref_cta:Sign in;ref_loc:Header"}" > Sign in </a> </div> </div> <div class="HeaderMenu js-header-menu height-fit position-lg-relative d-lg-flex flex-column flex-auto top-0"> <div class="HeaderMenu-wrapper d-flex flex-column flex-self-start flex-lg-row flex-auto rounded rounded-lg-0"> <nav class="HeaderMenu-nav" aria-label="Global"> <ul class="d-lg-flex list-style-none"> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down 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data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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</a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow color-fg-subtle mr-3"> <path d="M1 3a2 2 0 0 1 2-2h6.5a2 2 0 0 1 2 2v6.5a2 2 0 0 1-2 2H7v4.063C7 16.355 7.644 17 8.438 17H12.5v-2.5a2 2 0 0 1 2-2H21a2 2 0 0 1 2 2V21a2 2 0 0 1-2 2h-6.5a2 2 0 0 1-2-2v-2.5H8.437A2.939 2.939 0 0 1 5.5 15.562V11.5H3a2 2 0 0 1-2-2Zm2-.5a.5.5 0 0 0-.5.5v6.5a.5.5 0 0 0 .5.5h6.5a.5.5 0 0 0 .5-.5V3a.5.5 0 0 0-.5-.5ZM14.5 14a.5.5 0 0 0-.5.5V21a.5.5 0 0 0 .5.5H21a.5.5 0 0 0 .5-.5v-6.5a.5.5 0 0 0-.5-.5Z"></path> </svg> <div> <div class="color-fg-default h4">Actions</div> Automate any 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1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"discussions","context":"product","tag":"link","label":"discussions_link_product_navbar"}" href="https://github.com/features/discussions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-comment-discussion color-fg-subtle mr-3"> <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 14.25 14H8.061l-2.574 2.573A1.458 1.458 0 0 1 3 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12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 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Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_industries","context":"solutions","tag":"link","label":"view_all_industries_link_solutions_navbar"}" href="/solutions/industry"> View all industries </a></li> </ul> </div> </div> <div class="HeaderMenu-trailing-link rounded-bottom-2 flex-shrink-0 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold"> <a href="/solutions"> View all solutions <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon"> <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path> </svg> </a> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul 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data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"trending","context":"open_source","tag":"link","label":"trending_link_open_source_navbar"}" href="https://github.com/trending"> Trending </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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.25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg><span data-view-component="true" class="d-inline"> Star </span> <span id="repo-stars-counter-star" aria-label="819 users starred this repository" data-singular-suffix="user starred this repository" data-plural-suffix="users starred this repository" data-turbo-replace="true" title="819" data-view-component="true" class="Counter js-social-count">819</span> </a></div> </li> </ul> </div> </div> <div id="responsive-meta-container" data-turbo-replace> <div class="d-block d-md-none mb-2 px-3 px-md-4 px-lg-5"> <p class="f4 mb-3 "> Palette quantization library that powers pngquant and other PNG optimizers </p> <div class="mb-2 d-flex flex-items-center Link--secondary"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" 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data-target="react-partial.embeddedData">{"props":{"initialPayload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":72796114,"defaultBranch":"main","name":"libimagequant","ownerLogin":"ImageOptim","currentUserCanPush":false,"isFork":false,"isEmpty":false,"createdAt":"2016-11-03T23:30:08.000Z","ownerAvatar":"https://avatars.githubusercontent.com/u/17676906?v=4","public":true,"private":false,"isOrgOwned":true},"currentUser":null,"refInfo":{"name":"main","listCacheKey":"v0:1737656150.0","canEdit":false,"refType":"branch","currentOid":"b7340db2ac06bcdb36eec11f6251eee2c6d480b1"},"tree":{"items":[{"name":".github/workflows","path":".github/workflows","contentType":"directory","hasSimplifiedPath":true},{"name":"benches","path":"benches","contentType":"directory"},{"name":"examples","path":"examples","contentType":"directory"},{"name":"imagequant-sys","path":"imagequant-sys","contentType":"directory"},{"name":"src","path":"src","contentType":"directory"},{"name":".gitignore","path":".gitignore","contentType":"file"},{"name":"CHANGELOG","path":"CHANGELOG","contentType":"file"},{"name":"CODE_OF_CONDUCT.md","path":"CODE_OF_CONDUCT.md","contentType":"file"},{"name":"CONTRIBUTING.md","path":"CONTRIBUTING.md","contentType":"file"},{"name":"COPYRIGHT","path":"COPYRIGHT","contentType":"file"},{"name":"Cargo.toml","path":"Cargo.toml","contentType":"file"},{"name":"README.md","path":"README.md","contentType":"file"}],"templateDirectorySuggestionUrl":null,"readme":null,"totalCount":12,"showBranchInfobar":false},"fileTree":null,"fileTreeProcessingTime":null,"foldersToFetch":[],"treeExpanded":false,"symbolsExpanded":false,"isOverview":true,"overview":{"banners":{"shouldRecommendReadme":false,"isPersonalRepo":false,"showUseActionBanner":false,"actionSlug":null,"actionId":null,"showProtectBranchBanner":false,"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_repo","releasePath":"/ImageOptim/libimagequant/releases/new?marketplace=true","showPublishActionBanner":false},"interactionLimitBanner":null,"showInvitationBanner":false,"inviterName":null,"actionsMigrationBannerInfo":{"releaseTags":[],"showImmutableActionsMigrationBanner":false,"initialMigrationStatus":null}},"codeButton":{"contactPath":"/contact","isEnterprise":false,"local":{"protocolInfo":{"httpAvailable":true,"sshAvailable":null,"httpUrl":"https://github.com/ImageOptim/libimagequant.git","showCloneWarning":null,"sshUrl":null,"sshCertificatesRequired":null,"sshCertificatesAvailable":null,"ghCliUrl":"gh 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dir=\"auto\"\u003e\u003ca href=\"https://pngquant.org/lib/\" rel=\"nofollow\"\u003elibimagequant\u003c/a\u003e — Image Quantization Library\u003c/h1\u003e\u003ca id=\"user-content-libimagequant--image-quantization-library\" class=\"anchor\" aria-label=\"Permalink: libimagequant — Image Quantization Library\" href=\"#libimagequant--image-quantization-library\"\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\"\u003eImagequant library converts RGBA images to palette-based 8-bit indexed images, \u003cem\u003eincluding\u003c/em\u003e alpha component. It's ideal for generating tiny PNG images and \u003ca href=\"https://gif.ski\" rel=\"nofollow\"\u003enice-looking GIFs\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eImage encoding/decoding isn't handled by the library itself, bring your own encoder. If you're looking for a command-line tool, see \u003ca href=\"https://pngquant.org\" rel=\"nofollow\"\u003epngquant\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGetting started in C\u003c/h2\u003e\u003ca id=\"user-content-getting-started-in-c\" class=\"anchor\" aria-label=\"Permalink: Getting started in C\" href=\"#getting-started-in-c\"\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\"\u003eThis library can be used in C programs via \u003ca href=\"https://github.com/ImageOptim/libimagequant/tree/main/imagequant-sys\"\u003eimagequant-sys\u003c/a\u003e \u003ca href=\"https://www.rust-lang.org/\" rel=\"nofollow\"\u003eRust\u003c/a\u003e package.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"rustup update\ngit clone https://github.com/ImageOptim/libimagequant\ncd imagequant-sys\ncargo build --release\n# makes target/release/libimagequant_sys.a\"\u003e\u003cpre\u003erustup update\ngit clone https://github.com/ImageOptim/libimagequant\n\u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e imagequant-sys\ncargo build --release\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e makes target/release/libimagequant_sys.a\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://pngquant.org/lib/\" rel=\"nofollow\"\u003ethe C library documentation for more details\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGetting started in Rust\u003c/h2\u003e\u003ca id=\"user-content-getting-started-in-rust\" class=\"anchor\" aria-label=\"Permalink: Getting started in Rust\" href=\"#getting-started-in-rust\"\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\"\u003eAdd to \u003ccode\u003eCargo.toml\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"rustup update\ncargo add imagequant\"\u003e\u003cpre\u003erustup update\ncargo add imagequant\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://docs.rs/imagequant\" rel=\"nofollow\"\u003eSee docs.rs for the library API documentation\u003c/a\u003e.\u003c/p\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\"\u003eLibimagequant is dual-licensed:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFor Free/Libre Open Source Software it's available under GPL v3 or later with additional \u003ca href=\"https://raw.github.com/ImageOptim/libimagequant/master/COPYRIGHT\"\u003ecopyright notices\u003c/a\u003e for historical reasons.\u003c/li\u003e\n\u003cli\u003eFor use in closed-source software, AppStore distribution, and other non-GPL uses, you can \u003ca href=\"https://supso.org/projects/pngquant\" rel=\"nofollow\"\u003eobtain a commercial license\u003c/a\u003e. Feel free to ask \u003ca href=\"mailto:kornel@pngquant.org\"\u003ekornel@pngquant.org\u003c/a\u003e for details and custom licensing terms if you need them.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUpgrading instructions\u003c/h2\u003e\u003ca id=\"user-content-upgrading-instructions\" class=\"anchor\" aria-label=\"Permalink: Upgrading instructions\" href=\"#upgrading-instructions\"\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\"\u003elibimagequant v2 used to be a C library. libimagequant v4 is written entirely in Rust, but still exports the same C interface for C programs. You will need to install Rust 1.70+ to build it, and adjust your build commands. If you do not want to upgrade, you can keep using \u003ca href=\"https://github.com/imageoptim/libimagequant/tree/2.x\"\u003ethe C version of the library\u003c/a\u003e in the \u003ccode\u003e2.x\u003c/code\u003e branch of the \u003ca href=\"https://github.com/ImageOptim/libimagequant\"\u003erepo\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eC static library users\u003c/h3\u003e\u003ca id=\"user-content-c-static-library-users\" class=\"anchor\" aria-label=\"Permalink: C static library users\" href=\"#c-static-library-users\"\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\"\u003eFiles for C/C++ are now in the \u003ccode\u003eimagequant-sys/\u003c/code\u003e subdirectory, not in the root of the repo. There is no \u003ccode\u003econfigure \u0026amp;\u0026amp; make\u003c/code\u003e any more.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo build the library, install \u003ca href=\"https://rustup.rs\" rel=\"nofollow\"\u003eRust via rustup\u003c/a\u003e, and run:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"rustup update\ncd imagequant-sys\ncargo build --release\"\u003e\u003cpre\u003erustup update\n\u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e imagequant-sys\ncargo build --release\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt produces \u003ccode\u003etarget/release/libimagequant_sys.a\u003c/code\u003e static library. The API, ABI, and header files remain the same, so everything else should work the same.\nIf you're building for macOS or iOS, see included xcodeproj file (add it as a \u003ca href=\"https://gitlab.com/kornelski/cargo-xcode#usage\" rel=\"nofollow\"\u003esubproject\u003c/a\u003e to yours).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you're building for Android, run \u003ccode\u003erustup target add aarch64-linux-android; cargo build --release --target aarch64-linux-android\u003c/code\u003e and use \u003ccode\u003etarget/aarch64-linux-android/release/libimagequant_sys.a\u003c/code\u003e. Same for cross-compiling to other platforms. See \u003ccode\u003erustup target list\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eC dynamic library for package maintainers\u003c/h3\u003e\u003ca id=\"user-content-c-dynamic-library-for-package-maintainers\" class=\"anchor\" aria-label=\"Permalink: C dynamic library for package maintainers\" href=\"#c-dynamic-library-for-package-maintainers\"\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\"\u003eIf you're an application developer, please use the static linking option above — that option is much easier, and gives smaller executables.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe API and ABI of this library remains the same. It has the same sover, so it can be a drop-in replacement for the previous C version.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis library is now a typical Rust/Cargo library. If you want to set up \u003ca href=\"https://doc.rust-lang.org/cargo/faq.html#how-can-cargo-work-offline\" rel=\"nofollow\"\u003eoff-line builds\u003c/a\u003e or \u003ca href=\"https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html\" rel=\"nofollow\"\u003eoverride dependencies\u003c/a\u003e, it works the same as for every other Rust project. See \u003ca href=\"https://doc.rust-lang.org/cargo/\" rel=\"nofollow\"\u003eCargo docs\u003c/a\u003e for things like \u003ca href=\"https://doc.rust-lang.org/cargo/commands/cargo-fetch.html\" rel=\"nofollow\"\u003e\u003ccode\u003ecargo fetch\u003c/code\u003e\u003c/a\u003e or \u003ca href=\"https://doc.rust-lang.org/cargo/commands/cargo-vendor.html\" rel=\"nofollow\"\u003e\u003ccode\u003ecargo vendor\u003c/code\u003e\u003c/a\u003e (but I don't recommend vendoring).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you want to build a dynamic library, but aren't bothered by soname and rpath being wrong, modify \u003ccode\u003eimagequant-sys/Cargo.toml\u003c/code\u003e and add \u003ccode\u003e\"cdylib\"\u003c/code\u003e to the existing \u003ccode\u003ecrate-type\u003c/code\u003e property, and then \u003ccode\u003ecargo build --release\u003c/code\u003e will do its usual half-finished job and build \u003ccode\u003etarget/release/libimagequant.{so,dylib,dll}\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding with \u003ccode\u003emake\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-building-with-make\" class=\"anchor\" aria-label=\"Permalink: Building with make\" href=\"#building-with-make\"\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\u003econfigure \u0026amp;\u0026amp; make\u003c/code\u003e is gone. I hoped I could build a dynamic library just by wrapping the static library, but apparently that won't work, so I can't easily recreate the old \u003ccode\u003emake install\u003c/code\u003e. I wish there was a more standard and lightweight solution than using the \u003ccode\u003ecargo-c\u003c/code\u003e tool, so if you're good at wrangling linker flags and symbol visibility, please send pull requests.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding with \u003ccode\u003ecargo-c\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-building-with-cargo-c\" class=\"anchor\" aria-label=\"Permalink: Building with cargo-c\" href=\"#building-with-cargo-c\"\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 \u003ca href=\"https://lib.rs/cargo-c\" rel=\"nofollow\"\u003e\u003ccode\u003ecargo-c\u003c/code\u003e\u003c/a\u003e tool knows how to build and link so/dylib properly, and generates an accurate pkg-config file, so it's de-facto required for a correct system-wide install of a dynamic library.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"rustup update\ncd imagequant-sys\ncargo install cargo-c\ncargo cinstall --prefix=/usr/local --destdir=.\"\u003e\u003cpre\u003erustup update\n\u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e imagequant-sys\ncargo install cargo-c\ncargo cinstall --prefix=/usr/local --destdir=.\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis makes Rust 1.70 and \u003ccode\u003ecargo-c\u003c/code\u003e package a build-time dependency. No runtime deps (apart from Cargo-internal ones). OpenMP has been dropped entirely.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInteraction with pngquant\u003c/h4\u003e\u003ca id=\"user-content-interaction-with-pngquant\" class=\"anchor\" aria-label=\"Permalink: Interaction with pngquant\" href=\"#interaction-with-pngquant\"\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\"\u003epngquant v2 can use this library as a dynamic library. However, pngquant v4 does not support unbundling. It uses this library as a Cargo dependency via its Rust-native interface. The shared libimagequant library exports only a stable ABI for C programs, and this interface is not useful for Rust programs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUpgrading for Rust users\u003c/h3\u003e\u003ca id=\"user-content-upgrading-for-rust-users\" class=\"anchor\" aria-label=\"Permalink: Upgrading for Rust users\" href=\"#upgrading-for-rust-users\"\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\"\u003eIf you've used the \u003ca href=\"https://lib.rs/imagequant-sys\" rel=\"nofollow\"\u003e\u003ccode\u003eimagequant-sys\u003c/code\u003e\u003c/a\u003e crate, switch to the higher-level \u003ca href=\"https://lib.rs/imagequant\" rel=\"nofollow\"\u003e\u003ccode\u003eimagequant\u003c/code\u003e\u003c/a\u003e crate. The \u003ccode\u003eimagequant\u003c/code\u003e v4 is almost entirely backwards-compatible, with small changes that the Rust compiler will point out (e.g. changed use of \u003ccode\u003ec_int\u003c/code\u003e to \u003ccode\u003eu32\u003c/code\u003e). See \u003ca href=\"https://docs.rs/imagequant\" rel=\"nofollow\"\u003edocs\u003c/a\u003e. Please fix any deprecation warnings you may get, because the deprecated functions will be removed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eopenmp\u003c/code\u003e Cargo feature has been renamed to \u003ccode\u003ethreads\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003e.new_image()\u003c/code\u003e can now take ownership of its argument to avoid copying. If you get an error that \u003ccode\u003eFrom\u0026lt;\u0026amp;Vec\u0026lt;RGBA\u0026gt;\u0026gt;\u003c/code\u003e is not implemented, then either don't pass by reference (moves, avoids copying), or call \u003ccode\u003e.as_slice()\u003c/code\u003e on it (to copy the pixels), or use \u003ccode\u003e.new_image_borrowed()\u003c/code\u003e method instead.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eThreads support and WASM\u003c/h3\u003e\u003ca id=\"user-content-threads-support-and-wasm\" class=\"anchor\" aria-label=\"Permalink: Threads support and WASM\" href=\"#threads-support-and-wasm\"\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\"\u003eBy default, when the \u003ccode\u003ethreads\u003c/code\u003e Cargo feature is enabled, this library uses multi-threading. Number of threads can be controlled via \u003ccode\u003eRAYON_NUM_THREADS\u003c/code\u003e environment variable.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThreads in WASM are experimental, and require \u003ca href=\"https://github.com/GoogleChromeLabs/wasm-bindgen-rayon\"\u003especial handling\u003c/a\u003e. If you're targeting WASM, you'll most likely want to disable threads.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo disable threads when using this library as a dependency, disable default features like this in \u003ccode\u003eCargo.toml\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-toml notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"[dependencies]\nimagequant = { version = \u0026quot;4.0\u0026quot;, default-features = false }\"\u003e\u003cpre\u003e[\u003cspan class=\"pl-en\"\u003edependencies\u003c/span\u003e]\n\u003cspan class=\"pl-smi\"\u003eimagequant\u003c/span\u003e = { \u003cspan class=\"pl-smi\"\u003eversion\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e4.0\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003edefault-features\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003efalse\u003c/span\u003e }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen you compile the library directly, add \u003ccode\u003e--no-default-features\u003c/code\u003e flag instead.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"libimagequant — Image Quantization Library","anchor":"libimagequant--image-quantization-library","htmlText":"libimagequant — Image Quantization Library"},{"level":2,"text":"Getting started in C","anchor":"getting-started-in-c","htmlText":"Getting started in C"},{"level":2,"text":"Getting started in Rust","anchor":"getting-started-in-rust","htmlText":"Getting started in Rust"},{"level":2,"text":"License","anchor":"license","htmlText":"License"},{"level":2,"text":"Upgrading instructions","anchor":"upgrading-instructions","htmlText":"Upgrading instructions"},{"level":3,"text":"C static library users","anchor":"c-static-library-users","htmlText":"C static library users"},{"level":3,"text":"C dynamic library for package maintainers","anchor":"c-dynamic-library-for-package-maintainers","htmlText":"C dynamic library for package maintainers"},{"level":4,"text":"Building with make","anchor":"building-with-make","htmlText":"Building with make"},{"level":4,"text":"Building with cargo-c","anchor":"building-with-cargo-c","htmlText":"Building with cargo-c"},{"level":4,"text":"Interaction with pngquant","anchor":"interaction-with-pngquant","htmlText":"Interaction with pngquant"},{"level":3,"text":"Upgrading for Rust users","anchor":"upgrading-for-rust-users","htmlText":"Upgrading for Rust users"},{"level":3,"text":"Threads support and WASM","anchor":"threads-support-and-wasm","htmlText":"Threads support and 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octicon-list-unordered" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb 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"><a href="https://pngquant.org/lib/" rel="nofollow">libimagequant</a> — Image Quantization Library</h1><a id="user-content-libimagequant--image-quantization-library" class="anchor" aria-label="Permalink: libimagequant — Image Quantization Library" href="#libimagequant--image-quantization-library"><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">Imagequant library converts RGBA images to palette-based 8-bit indexed images, <em>including</em> alpha component. It's ideal for generating tiny PNG images and <a href="https://gif.ski" rel="nofollow">nice-looking GIFs</a>.</p> <p dir="auto">Image encoding/decoding isn't handled by the library itself, bring your own encoder. If you're looking for a command-line tool, see <a href="https://pngquant.org" rel="nofollow">pngquant</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Getting started in C</h2><a id="user-content-getting-started-in-c" class="anchor" aria-label="Permalink: Getting started in C" href="#getting-started-in-c"><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">This library can be used in C programs via <a href="https://github.com/ImageOptim/libimagequant/tree/main/imagequant-sys">imagequant-sys</a> <a href="https://www.rust-lang.org/" rel="nofollow">Rust</a> package.</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="rustup update git clone https://github.com/ImageOptim/libimagequant cd imagequant-sys cargo build --release # makes target/release/libimagequant_sys.a"><pre>rustup update git clone https://github.com/ImageOptim/libimagequant <span class="pl-c1">cd</span> imagequant-sys cargo build --release <span class="pl-c"><span class="pl-c">#</span> makes target/release/libimagequant_sys.a</span></pre></div> <p dir="auto">See <a href="https://pngquant.org/lib/" rel="nofollow">the C library documentation for more details</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Getting started in Rust</h2><a id="user-content-getting-started-in-rust" class="anchor" aria-label="Permalink: Getting started in Rust" href="#getting-started-in-rust"><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">Add to <code>Cargo.toml</code>:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="rustup update cargo add imagequant"><pre>rustup update cargo add imagequant</pre></div> <p dir="auto"><a href="https://docs.rs/imagequant" rel="nofollow">See docs.rs for the library API documentation</a>.</p> <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">Libimagequant is dual-licensed:</p> <ul dir="auto"> <li>For Free/Libre Open Source Software it's available under GPL v3 or later with additional <a href="https://raw.github.com/ImageOptim/libimagequant/master/COPYRIGHT">copyright notices</a> for historical reasons.</li> <li>For use in closed-source software, AppStore distribution, and other non-GPL uses, you can <a href="https://supso.org/projects/pngquant" rel="nofollow">obtain a commercial license</a>. Feel free to ask <a href="mailto:kornel@pngquant.org">kornel@pngquant.org</a> for details and custom licensing terms if you need them.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Upgrading instructions</h2><a id="user-content-upgrading-instructions" class="anchor" aria-label="Permalink: Upgrading instructions" href="#upgrading-instructions"><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">libimagequant v2 used to be a C library. libimagequant v4 is written entirely in Rust, but still exports the same C interface for C programs. You will need to install Rust 1.70+ to build it, and adjust your build commands. If you do not want to upgrade, you can keep using <a href="https://github.com/imageoptim/libimagequant/tree/2.x">the C version of the library</a> in the <code>2.x</code> branch of the <a href="https://github.com/ImageOptim/libimagequant">repo</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">C static library users</h3><a id="user-content-c-static-library-users" class="anchor" aria-label="Permalink: C static library users" href="#c-static-library-users"><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">Files for C/C++ are now in the <code>imagequant-sys/</code> subdirectory, not in the root of the repo. There is no <code>configure && make</code> any more.</p> <p dir="auto">To build the library, install <a href="https://rustup.rs" rel="nofollow">Rust via rustup</a>, and run:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="rustup update cd imagequant-sys cargo build --release"><pre>rustup update <span class="pl-c1">cd</span> imagequant-sys cargo build --release</pre></div> <p dir="auto">It produces <code>target/release/libimagequant_sys.a</code> static library. The API, ABI, and header files remain the same, so everything else should work the same. If you're building for macOS or iOS, see included xcodeproj file (add it as a <a href="https://gitlab.com/kornelski/cargo-xcode#usage" rel="nofollow">subproject</a> to yours).</p> <p dir="auto">If you're building for Android, run <code>rustup target add aarch64-linux-android; cargo build --release --target aarch64-linux-android</code> and use <code>target/aarch64-linux-android/release/libimagequant_sys.a</code>. Same for cross-compiling to other platforms. See <code>rustup target list</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">C dynamic library for package maintainers</h3><a id="user-content-c-dynamic-library-for-package-maintainers" class="anchor" aria-label="Permalink: C dynamic library for package maintainers" href="#c-dynamic-library-for-package-maintainers"><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">If you're an application developer, please use the static linking option above — that option is much easier, and gives smaller executables.</p> <p dir="auto">The API and ABI of this library remains the same. It has the same sover, so it can be a drop-in replacement for the previous C version.</p> <p dir="auto">This library is now a typical Rust/Cargo library. If you want to set up <a href="https://doc.rust-lang.org/cargo/faq.html#how-can-cargo-work-offline" rel="nofollow">off-line builds</a> or <a href="https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html" rel="nofollow">override dependencies</a>, it works the same as for every other Rust project. See <a href="https://doc.rust-lang.org/cargo/" rel="nofollow">Cargo docs</a> for things like <a href="https://doc.rust-lang.org/cargo/commands/cargo-fetch.html" rel="nofollow"><code>cargo fetch</code></a> or <a href="https://doc.rust-lang.org/cargo/commands/cargo-vendor.html" rel="nofollow"><code>cargo vendor</code></a> (but I don't recommend vendoring).</p> <p dir="auto">If you want to build a dynamic library, but aren't bothered by soname and rpath being wrong, modify <code>imagequant-sys/Cargo.toml</code> and add <code>"cdylib"</code> to the existing <code>crate-type</code> property, and then <code>cargo build --release</code> will do its usual half-finished job and build <code>target/release/libimagequant.{so,dylib,dll}</code>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Building with <code>make</code></h4><a id="user-content-building-with-make" class="anchor" aria-label="Permalink: Building with make" href="#building-with-make"><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>configure && make</code> is gone. I hoped I could build a dynamic library just by wrapping the static library, but apparently that won't work, so I can't easily recreate the old <code>make install</code>. I wish there was a more standard and lightweight solution than using the <code>cargo-c</code> tool, so if you're good at wrangling linker flags and symbol visibility, please send pull requests.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Building with <code>cargo-c</code></h4><a id="user-content-building-with-cargo-c" class="anchor" aria-label="Permalink: Building with cargo-c" href="#building-with-cargo-c"><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 <a href="https://lib.rs/cargo-c" rel="nofollow"><code>cargo-c</code></a> tool knows how to build and link so/dylib properly, and generates an accurate pkg-config file, so it's de-facto required for a correct system-wide install of a dynamic library.</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="rustup update cd imagequant-sys cargo install cargo-c cargo cinstall --prefix=/usr/local --destdir=."><pre>rustup update <span class="pl-c1">cd</span> imagequant-sys cargo install cargo-c cargo cinstall --prefix=/usr/local --destdir=.</pre></div> <p dir="auto">This makes Rust 1.70 and <code>cargo-c</code> package a build-time dependency. No runtime deps (apart from Cargo-internal ones). OpenMP has been dropped entirely.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Interaction with pngquant</h4><a id="user-content-interaction-with-pngquant" class="anchor" aria-label="Permalink: Interaction with pngquant" href="#interaction-with-pngquant"><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">pngquant v2 can use this library as a dynamic library. However, pngquant v4 does not support unbundling. It uses this library as a Cargo dependency via its Rust-native interface. The shared libimagequant library exports only a stable ABI for C programs, and this interface is not useful for Rust programs.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Upgrading for Rust users</h3><a id="user-content-upgrading-for-rust-users" class="anchor" aria-label="Permalink: Upgrading for Rust users" href="#upgrading-for-rust-users"><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">If you've used the <a href="https://lib.rs/imagequant-sys" rel="nofollow"><code>imagequant-sys</code></a> crate, switch to the higher-level <a href="https://lib.rs/imagequant" rel="nofollow"><code>imagequant</code></a> crate. The <code>imagequant</code> v4 is almost entirely backwards-compatible, with small changes that the Rust compiler will point out (e.g. changed use of <code>c_int</code> to <code>u32</code>). See <a href="https://docs.rs/imagequant" rel="nofollow">docs</a>. Please fix any deprecation warnings you may get, because the deprecated functions will be removed.</p> <p dir="auto">The <code>openmp</code> Cargo feature has been renamed to <code>threads</code>.</p> <p dir="auto"><code>.new_image()</code> can now take ownership of its argument to avoid copying. If you get an error that <code>From<&Vec<RGBA>></code> is not implemented, then either don't pass by reference (moves, avoids copying), or call <code>.as_slice()</code> on it (to copy the pixels), or use <code>.new_image_borrowed()</code> method instead.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Threads support and WASM</h3><a id="user-content-threads-support-and-wasm" class="anchor" aria-label="Permalink: Threads support and WASM" href="#threads-support-and-wasm"><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">By default, when the <code>threads</code> Cargo feature is enabled, this library uses multi-threading. Number of threads can be controlled via <code>RAYON_NUM_THREADS</code> environment variable.</p> <p dir="auto">Threads in WASM are experimental, and require <a href="https://github.com/GoogleChromeLabs/wasm-bindgen-rayon">special handling</a>. If you're targeting WASM, you'll most likely want to disable threads.</p> <p dir="auto">To disable threads when using this library as a dependency, disable default features like this in <code>Cargo.toml</code>:</p> <div class="highlight highlight-source-toml notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="[dependencies] imagequant = { version = "4.0", default-features = false }"><pre>[<span class="pl-en">dependencies</span>] <span class="pl-smi">imagequant</span> = { <span class="pl-smi">version</span> = <span class="pl-s"><span class="pl-pds">"</span>4.0<span class="pl-pds">"</span></span>, <span class="pl-smi">default-features</span> = <span class="pl-c1">false</span> }</pre></div> <p dir="auto">When you compile the library directly, add <code>--no-default-features</code> flag instead.</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="t+3hXXN4A7MMWpXTQGplZmcMmtJhmYPb/UXTm+8MvF3U+APOSx/q56hDdVOFufvCfC5NZ9XQkIWckzWgZIkEBw==" /> </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"> Palette quantization library that powers pngquant and other PNG optimizers </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <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> <span class="flex-auto min-width-0 css-truncate css-truncate-target width-fit"> <a title="https://pngquant.org/lib" role="link" target="_blank" rel="noopener noreferrer nofollow" class="text-bold" href="https://pngquant.org/lib">pngquant.org/lib</a> </span> </div> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/palette" title="Topic: palette" data-view-component="true" class="topic-tag topic-tag-link"> palette </a> <a href="/topics/quality" title="Topic: quality" data-view-component="true" class="topic-tag topic-tag-link"> quality </a> <a href="/topics/visual-studio" title="Topic: visual-studio" data-view-component="true" class="topic-tag topic-tag-link"> visual-studio </a> <a href="/topics/conversion" title="Topic: conversion" data-view-component="true" class="topic-tag topic-tag-link"> conversion </a> <a href="/topics/callback" title="Topic: callback" data-view-component="true" class="topic-tag topic-tag-link"> callback </a> <a href="/topics/minification" title="Topic: minification" data-view-component="true" class="topic-tag topic-tag-link"> minification </a> <a href="/topics/image-optimization" title="Topic: image-optimization" data-view-component="true" class="topic-tag topic-tag-link"> image-optimization </a> <a href="/topics/quantization" title="Topic: quantization" data-view-component="true" class="topic-tag topic-tag-link"> quantization </a> <a href="/topics/rgba-pixels" title="Topic: rgba-pixels" data-view-component="true" class="topic-tag topic-tag-link"> rgba-pixels </a> <a href="/topics/palette-generation" title="Topic: palette-generation" data-view-component="true" class="topic-tag topic-tag-link"> palette-generation </a> <a href="/topics/pixel-array" title="Topic: pixel-array" data-view-component="true" class="topic-tag topic-tag-link"> pixel-array </a> <a href="/topics/image-pixels" title="Topic: image-pixels" data-view-component="true" class="topic-tag topic-tag-link"> image-pixels </a> <a href="/topics/pngquant" title="Topic: pngquant" data-view-component="true" class="topic-tag topic-tag-link"> pngquant </a> </div> </div> <h3 class="sr-only">Resources</h3> <div class="mt-2"> <a class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:readme"}" href="#readme-ov-file"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book mr-2"> <path d="M0 1.75A.75.75 0 0 1 .75 1h4.253c1.227 0 2.317.59 3 1.501A3.743 3.743 0 0 1 11.006 1h4.245a.75.75 0 0 1 .75.75v10.5a.75.75 0 0 1-.75.75h-4.507a2.25 2.25 0 0 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0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>819</strong> stars</a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/ImageOptim/libimagequant/watchers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>25</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/ImageOptim/libimagequant/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>134</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2FImageOptim%2Flibimagequant&report=ImageOptim+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row" hidden> <div class="BorderGrid-cell"> <include-fragment src="/ImageOptim/libimagequant/used_by_list" accept="text/fragment+html"> </include-fragment> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/ImageOptim/libimagequant/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Contributors <span title="46" data-view-component="true" class="Counter ml-1">46</span></a></h2> <include-fragment src="/ImageOptim/libimagequant/contributors_list?count=46&current_repository=libimagequant&items_to_show=14" aria-busy="true" aria-label="Loading contributors"> <ul class="list-style-none 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style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> </ul> </include-fragment> <div data-view-component="true" class="mt-3"> <a text="small" href="/ImageOptim/libimagequant/graphs/contributors" data-view-component="true" class="Link--inTextBlock Link">+ 32 contributors</a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3">Languages</h2> <div class="mb-2"> <span data-view-component="true" class="Progress"> 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href="/ImageOptim/libimagequant/search?l=rust" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#dea584;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Rust</span> <span>82.1%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/ImageOptim/libimagequant/search?l=c" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#555555;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">C</span> <span>9.7%</span> </a> 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m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>