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sniff safari 12, macos 10.14 to support COLR, as safari doesn't wait for the font to load to emit load

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Bruno Windels 2019-05-29 11:59:50 +02:00 committed by J. Ryan Stinnett
parent 85b0107f6c
commit 43f642a8fe
1 changed files with 23 additions and 0 deletions
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23
src/utils/FontManager.js
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@ -21,6 +21,23 @@ limitations under the License.
* MIT license
*/
function safariVersionCheck(ua) {
const safariVersionMatch = ua.match(/Mac OS X ([\d|_]+).*Version\/([\d|\.]+) Safari/);
if (safariVersionMatch) {
const macOSVersionStr = safariVersionMatch[1];
const safariVersionStr = safariVersionMatch[2];
const macOSVersion = macOSVersionStr.split("_").map(n => parseInt(n, 10));
const safariVersion = safariVersionStr.split(".").map(n => parseInt(n, 10));
const colrFontSupported = macOSVersion[0] >= 10 && macOSVersion[1] >= 14 && safariVersion[0] >= 12;
// https://www.colorfonts.wtf/ states safari supports COLR fonts from this version on
console.log(`Browser is Safari - requiring macOS 10.14 and Safari 12,` +
`detected Safari ${safariVersionStr} on macOS ${macOSVersionStr},` +
`supported: ${colrFontSupported}`);
return colrFontSupported;
}
return false;
}
async function isColrFontSupported() {
console.log("Checking for COLR support");
@ -32,6 +49,12 @@ async function isColrFontSupported() {
console.log("Browser is Firefox - assuming COLR is supported");
return true;
}
// Safari doesn't wait for the font to load (if it doesn't have it in cache)
// to emit the load event on the image, so there is no way to not make the check
// reliable. Instead sniff the version.
if (navigator.userAgent.includes("Safari")) {
return safariVersionCheck(navigator.userAgent);
}
try {
const canvas = document.createElement('canvas');