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perf: cache approx line height in textwysiwg (#4651)

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Aakansha Doshi 2022-01-25 17:01:12 +05:30 • committed by GitHub
parent c009e03c8e
commit abff780983
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2 changed files with 17 additions and 7 deletions
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8
src/element/textElement.ts
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@ -205,8 +205,14 @@ export const measureText = (
};
const DUMMY_TEXT = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toLocaleUpperCase();
const cacheApproxLineHeight: { [key: FontString]: number } = {};
export const getApproxLineHeight = (font: FontString) => {
return measureText(DUMMY_TEXT, font, null).height;
if (cacheApproxLineHeight[font]) {
return cacheApproxLineHeight[font];
}
cacheApproxLineHeight[font] = measureText(DUMMY_TEXT, font, null).height;
return cacheApproxLineHeight[font];
};
let canvas: HTMLCanvasElement | undefined;