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feat: support loading woff2 font in Wasm
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yisibl committed Sep 25, 2023
1 parent 06f2d15 commit 977e9ac
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Showing 5 changed files with 38 additions and 21 deletions.
2 changes: 2 additions & 0 deletions Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ pathfinder_content = { version = "0.5.0", default-features = false }
pathfinder_simd = { version = "0.5.1", features = ["pf-no-simd"] }
futures = "0.3.21"
usvg-writer = { git = "https://github.com/zimond/resvg", rev = "6201182c" }
woff2 = "0.3.0"

[target.'cfg(all(not(all(target_os = "linux", target_arch = "aarch64", target_env = "musl")), not(all(target_os = "windows", target_arch = "aarch64")), not(target_arch = "wasm32")))'.dependencies]
mimalloc-rust = { version = "0.2" }
Expand Down Expand Up @@ -57,3 +58,4 @@ codegen-units = 1

[patch.crates-io]
resvg = { git = "https://github.com/zimond/resvg", rev = "6201182c" }
woff2 = { git="https://github.com/yisibl/woff2-rs", branch="fix-total-compressed-size" }
Binary file added example/SourceHanSerifSC-Regular.otf
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Binary file added example/SourceHanSerifSC-Regular.woff2
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11 changes: 10 additions & 1 deletion src/fonts.rs
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,9 @@ use resvg::usvg_text_layout::fontdb::{Family, Query, Source};
#[cfg(target_arch = "wasm32")]
use wasm_bindgen::JsCast;

#[cfg(target_arch = "wasm32")]
use woff2::decode::{convert_woff2_to_ttf, is_woff2};

/// Loads fonts.
#[cfg(not(target_arch = "wasm32"))]
pub fn load_fonts(font_options: &JsFontOptions) -> Database {
Expand Down Expand Up @@ -62,7 +65,13 @@ pub fn load_wasm_fonts(
for font in font_buffers.values().into_iter() {
let raw_font = font?;
let font_data = raw_font.dyn_into::<js_sys::Uint8Array>()?.to_vec();
fontdb.load_font_data(font_data);

let font_buffer = if is_woff2(&font_data) {
convert_woff2_to_ttf(&mut std::io::Cursor::new(font_data)).unwrap()
} else {
font_data
};
fontdb.load_font_data(font_buffer);
}
}

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46 changes: 26 additions & 20 deletions wasm/index.html
Original file line number Diff line number Diff line change
Expand Up @@ -162,7 +162,18 @@
const output = document.getElementById('output')
const svgElement = document.querySelector('#input-svg')
const inputSVG = svgElement.value.trim()
let resvgOpts = {}

const font = await fetch('../example/SourceHanSerifSC-Regular.woff2')
const buffer = new Uint8Array(await font.arrayBuffer())
console.log('font buffer size', buffer.length)

let resvgOpts = {
font: {
fontsBuffers: [buffer],
// OpenType 中定义的 Font Family name,也就是 nameID=1
defaultFontFamily: 'Source Han Serif SC',
},
}
await svg2png(inputSVG, resvgOpts)

async function svg2png(svgString, opts, hasCrop) {
Expand Down Expand Up @@ -296,25 +307,20 @@ <h1>resvg-js playground</h1>
<div class="header-info">
<div class="info" id="svg-info"></div>
</div>
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<use fill="#D8D8D8" xlink:href="#a"/>
<use fill="url(#b)" xlink:href="#a"/>
<text x="50%" y="50%" font-size="60" fill="#FFF" dominant-baseline="middle" text-anchor="middle">思源宋体</text>
</g>
</svg>
</textarea>
</div>
<div class="cell" id="output">
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