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index.html
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<!doctype html>
<html>
<head>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-SJ5CP8DCH9"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-SJ5CP8DCH9');
</script>
<meta charset='UTF-8'><meta name='viewport' content='width=device-width initial-scale=1'>
<style type='text/css'>html {overflow-x: initial !important;}:root { --bg-color: #ffffff; --text-color: #333333; --select-text-bg-color: #B5D6FC; --select-text-font-color: auto; --monospace: "Lucida Console",Consolas,"Courier",monospace; --title-bar-height: 20px; }
.mac-os-11 { --title-bar-height: 28px; }
html { font-size: 14px; background-color: var(--bg-color); color: var(--text-color); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
h1, h2, h3, h4, h5 { white-space: pre-wrap; }
body { margin: 0px; padding: 0px; height: auto; inset: 0px; font-size: 1rem; line-height: 1.428571; overflow-x: hidden; background: inherit; tab-size: 4; }
iframe { margin: auto; }
a.url { word-break: break-all; }
a:active, a:hover { outline: 0px; }
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pre.md-meta-block { font-size: 0.8rem; min-height: 0.8rem; white-space: pre-wrap; background: rgb(204, 204, 204); display: block; overflow-x: hidden; }
p > .md-image:only-child:not(.md-img-error) img, p > img:only-child { display: block; margin: auto; }
#write.first-line-indent p > .md-image:only-child:not(.md-img-error) img { left: -2em; position: relative; }
p > .md-image:only-child { display: inline-block; width: 100%; }
#write .MathJax_Display { margin: 0.8em 0px 0px; }
.md-math-block { width: 100%; }
.md-math-block:not(:empty)::after { display: none; }
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[lang="flow"] svg, [lang="mermaid"] svg { max-width: 100%; height: auto; }
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video { max-width: 100%; display: block; margin: 0px auto; }
iframe { max-width: 100%; width: 100%; border: medium; }
.highlight td, .highlight tr { border: 0px; }
mark { background: rgb(255, 255, 0); color: rgb(0, 0, 0); }
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</style><title>PangoCairo on the Web</title>
</head>
<body class='typora-export'><div class='typora-export-content'>
<div id='write' class=''><h1 id='pangocairo-on-the-web'><span><a href="https://github.com/VitoVan/pango-cairo-wasm">PangoCairo on the Web</a></span></h1><p><span>Compile </span><a href='https://www.cairographics.org/'><span>Cairo</span></a><span>/</span><a href='https://docs.gtk.org/Pango/index.html'><span>Pango</span></a><span>/</span><a href='https://docs.gtk.org/PangoCairo'><span>PangoCairo</span></a><span> based applications from C to WebAssembly?</span><a href="https://github.com/VitoVan/pango-cairo-wasm" style="float:right">src</a></p><p><span>Try it online (1.5 ~ 3.5 MB data transfer):</span></p><p><strong><span>Cairo</span></strong><span>: </span><a href='https://vitovan.com/pango-cairo-wasm/hello-cairo.html' target='_blank' class='url'>https://vitovan.com/pango-cairo-wasm/hello-cairo.html</a></p><p><strong><span>PangoCairo</span></strong><span>: </span>The pthreads used by Pango requires Web Workers require extra <a href="https://web.dev/coop-coep/">HTTP HEADERS</a>, and the <a href="https://dev.to/stefnotch/enabling-coop-coep-without-touching-the-server-2d3n">workarounds</a> would break other pages on my website. So, please <a href="https://github.com/VitoVan/pango-cairo-wasm/archive/refs/heads/gh-pages.zip">download</a> the files and <a href="https://github.com/VitoVan/pango-cairo-wasm/blob/main/wasm-server">serve</a> them locally.</p><p><span>Preview:</span></p><p><img src="hello-cairo.png" referrerpolicy="no-referrer" alt="Hello Cairo"></p><p><img src="hello-pango.png" referrerpolicy="no-referrer" alt="Hello Pango"></p><h2 id='usage'><span>Usage</span></h2><h3 id='setup-emcc--pkg-config'><span>Setup emcc & pkg-config</span></h3><h4 id='with-docker'><span>with Docker</span></h4><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">alias <span class="cm-def">emcc</span><span class="cm-operator">=</span><span class="cm-string">"docker run --rm --name pcwa -v </span><span class="cm-quote">$(pwd)</span><span class="cm-string">:/app -w=/app vitovan/pango-cairo-wasm emcc"</span></span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">alias <span class="cm-def">pkg-config</span><span class="cm-operator">=</span><span class="cm-string">"docker run --rm --name pcwa -v </span><span class="cm-quote">$(pwd)</span><span class="cm-string">:/app -w=/app vitovan/pango-cairo-wasm pkg-config"</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># give it a try</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">emcc <span class="cm-attribute">--help</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">pkg-config <span class="cm-attribute">--libs</span> <span class="cm-attribute">--cflags</span> pangocairo</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 156px;"></div><div class="CodeMirror-gutters" style="display: none; height: 156px;"></div></div></div></pre><h4 id='from-source'><span>from Source</span></h4><p><span>This build.sh only compiles on Fedora, if you can't get one, please modify it before execution.</span></p><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">git</span> clone https://github.com/VitoVan/pango-cairo-wasm.git</span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">cd</span> pango-cairo-wasm</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">git</span> submodule init</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">git</span> submodule update</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">echo</span> <span class="cm-attribute">-e</span> <span class="cm-string">"export magicdir=</span><span class="cm-def">${HOME}</span><span class="cm-string">/pango-cairo-wasm-magic\n</span><span class="cm-quote">$(cat env.sh)</span><span class="cm-string">"</span> > env.sh</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">bash</span> build.sh</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 156px;"></div><div class="CodeMirror-gutters" style="display: none; height: 156px;"></div></div></div></pre><p><span>Wait for 20 minutes or more. If all went well, execute:</span></p><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">. env.sh</span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># give it a try</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">emcc <span class="cm-attribute">--help</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">pkg-config <span class="cm-attribute">--libs</span> <span class="cm-attribute">--cflags</span> pangocairo</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 104px;"></div><div class="CodeMirror-gutters" style="display: none; height: 104px;"></div></div></div></pre><h3 id='compile-c-code'><span>Compile C Code</span></h3><h4 id='cairo-with-no-pthread'><span>Cairo with no pthread</span></h4><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">export</span> <span class="cm-def">CAIRO_FLAGS</span><span class="cm-operator">=</span><span class="cm-string">"</span><span class="cm-quote">$(pkg-config --libs --cflags glib-2.0, gobject-2.0, cairo, pixman-1, freetype2, fontconfig, cairo, expat, harfbuzz)</span><span class="cm-string"> -s USE_SDL=2 -s USE_PTHREADS=0 -s ASYNCIFY"</span></span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span cm-text="" cm-zwsp="">
</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">curl</span> <span class="cm-attribute">-LO</span> https://raw.githubusercontent.com/VitoVan/pango-cairo-wasm/main/hello-cairo.c</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">emcc <span class="cm-def">$CAIRO_FLAGS</span> hello-cairo.c <span class="cm-attribute">-o</span> hello-cairo.html</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 130px;"></div><div class="CodeMirror-gutters" style="display: none; height: 130px;"></div></div></div></pre><h4 id='pangocairo-with-pthread'><span>PangoCairo with pthread</span></h4><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">export</span> <span class="cm-def">PANGOCAIRO_FLAGS</span><span class="cm-operator">=</span><span class="cm-string">"</span><span class="cm-quote">$(pkg-config --libs --cflags glib-2.0, gobject-2.0, cairo, pixman-1, freetype2, fontconfig, cairo, expat, harfbuzz, pangocairo)</span><span class="cm-string"> -s USE_SDL=2 -s EMULATE_FUNCTION_POINTER_CASTS -s PTHREAD_POOL_SIZE=10 -s USE_PTHREADS=1 -s ASYNCIFY"</span></span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">curl</span> <span class="cm-attribute">-LO</span> https://raw.githubusercontent.com/VitoVan/pango-cairo-wasm/main/hello-pangocairo.c</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># get yourself the fonts</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">mkdir</span> ./fonts</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">cd</span> fonts</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">curl</span> <span class="cm-attribute">-LO</span> https://raw.githubusercontent.com/VitoVan/pango-cairo-wasm/main/fonts/OpenSans-VariableFont_wdth,wght.ttf</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">curl</span> <span class="cm-attribute">-LO</span> https://raw.githubusercontent.com/VitoVan/pango-cairo-wasm/main/fonts/OpenSans-Italic-VariableFont_wdth,wght.ttf</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">cd</span> ..</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># compile</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">emcc <span class="cm-def">$PANGOCAIRO_FLAGS</span> <span class="cm-attribute">--embed-file</span> ./fonts@/usr/share/fonts/ hello-pangocairo.c <span class="cm-attribute">-o</span> hello-pangocairo.html</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 390px;"></div><div class="CodeMirror-gutters" style="display: none; height: 390px;"></div></div></div></pre><h4 id='start-the-debug-server'><span>Start the debug server</span></h4><pre class="md-fences md-end-block ty-contain-cm modeLoaded" spellcheck="false" lang="bash"><div class="CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 11px; left: 4px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: currentcolor;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: currentcolor;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">curl</span> <span class="cm-attribute">-LO</span> https://raw.githubusercontent.com/VitoVan/pango-cairo-wasm/main/wasm-server</span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">chmod</span> <span class="cm-operator">+</span>x wasm-server</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">./wasm-server</span></pre></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom-width: 0px; border-bottom-style: solid; border-bottom-color: transparent; top: 78px;"></div><div class="CodeMirror-gutters" style="display: none; height: 78px;"></div></div></div></pre><p><span>open the following links in your browser:</span></p><ul><li><p><a href='http://localhost:4242/hello-cairo.html' target='_blank' class='url'>http://localhost:4242/hello-cairo.html</a></p></li><li><p><a href='http://localhost:4242/hello-pangocairo.html' target='_blank' class='url'>http://localhost:4242/hello-pangocairo.html</a></p></li></ul></div></div>
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