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Code Issues Releases Wiki Activity

Add some logging for COLR checks

pull/21833/head
Travis Ralston 2019-05-24 10:36:07 -06:00
parent cf932e0eab
commit ef9ef0e654
1 changed files with 8 additions and 1 deletions
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9
src/utils/FontManager.js
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@ -28,10 +28,13 @@ async function isColrFontSupported() {
return colrFontSupported;
}
console.log("Checking for COLR support");
// Firefox has supported COLR fonts since version 26
// but doesn't support the check below with content blocking enabled.
if (navigator.userAgent.includes("Firefox")) {
colrFontSupported = true;
console.log("Browser is Firefox - assuming COLR is supported");
return colrFontSupported;
}
@ -62,12 +65,16 @@ async function isColrFontSupported() {
const wait = ms => new Promise((r, j)=>setTimeout(r, ms));
await wait(500);
console.log("Drawing canvas to detect COLR support");
context.drawImage(img, 0, 0);
colrFontSupported = (context.getImageData(10, 10, 1, 1).data[0] === 200);
console.log("Canvas check revealed COLR is supported? " + colrFontSupported);
} catch (e) {
console.error("Couldn't load colr font", e);
console.error("Couldn't load COLR font", e);
colrFontSupported = false;
}
console.log({colrFontSupported});
return colrFontSupported;
}