33 lines
1.5 KiB
JavaScript
33 lines
1.5 KiB
JavaScript
import { DEFAULT_SERIF_FONT, DEFAULT_SANS_SERIF_FONT } from '../shared/lib/constants';
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const capsizeFontsMetrics = require('next/dist/server/capsize-font-metrics.json');
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function formatName(str) {
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return str.replace(/(?:^\w|[A-Z]|\b\w)/g, function(word, index) {
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return index === 0 ? word.toLowerCase() : word.toUpperCase();
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}).replace(/\s+/g, '');
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}
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function formatOverrideValue(val) {
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return Math.abs(val * 100).toFixed(2);
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}
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export function calculateSizeAdjustValues(fontName) {
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const fontKey = formatName(fontName);
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const fontMetrics = capsizeFontsMetrics[fontKey];
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let { category, ascent, descent, lineGap, unitsPerEm, xWidthAvg } = fontMetrics;
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const mainFontAvgWidth = xWidthAvg / unitsPerEm;
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const fallbackFont = category === 'serif' ? DEFAULT_SERIF_FONT : DEFAULT_SANS_SERIF_FONT;
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const fallbackFontName = formatName(fallbackFont.name);
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const fallbackFontMetrics = capsizeFontsMetrics[fallbackFontName];
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const fallbackFontAvgWidth = fallbackFontMetrics.xWidthAvg / fallbackFontMetrics.unitsPerEm;
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let sizeAdjust = xWidthAvg ? mainFontAvgWidth / fallbackFontAvgWidth : 1;
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ascent = formatOverrideValue(ascent / (unitsPerEm * sizeAdjust));
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descent = formatOverrideValue(descent / (unitsPerEm * sizeAdjust));
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lineGap = formatOverrideValue(lineGap / (unitsPerEm * sizeAdjust));
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return {
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ascent,
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descent,
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lineGap,
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fallbackFont: fallbackFont.name,
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sizeAdjust: formatOverrideValue(sizeAdjust)
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};
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}
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//# sourceMappingURL=font-utils.js.map
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