52 lines
1.2 KiB
TypeScript
52 lines
1.2 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import * as grapheme from './grapheme';
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import { getEmojiCount } from '../components/emoji/lib';
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type FontSizes = {
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diameter: number;
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singleEmoji: number;
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smol: number;
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text: number;
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};
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type RectSize = {
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height: number;
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width: number;
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};
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export function getFontSizes(bubbleSize: number): FontSizes {
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return {
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diameter: Math.ceil(bubbleSize * 0.75),
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singleEmoji: Math.ceil(bubbleSize * 0.6),
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smol: Math.ceil(bubbleSize * 0.05),
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text: Math.ceil(bubbleSize * 0.45),
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};
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}
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export function getFittedFontSize(
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bubbleSize: number,
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text: string,
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measure: (candidateFontSize: number) => RectSize
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): number {
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const sizes = getFontSizes(bubbleSize);
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let candidateFontSize = sizes.text;
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if (grapheme.count(text) === 1 && getEmojiCount(text) === 1) {
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candidateFontSize = sizes.singleEmoji;
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}
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for (
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candidateFontSize;
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candidateFontSize >= sizes.smol;
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candidateFontSize -= 1
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) {
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const { height, width } = measure(candidateFontSize);
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if (width < sizes.diameter && height < sizes.diameter) {
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return candidateFontSize;
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}
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}
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return candidateFontSize;
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}
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