42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
'use strict';
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const gm = require('gm');
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const LruCache = require('./lru-cache');
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const imageMagick = gm.subClass({ imageMagick: true });
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// The following is an arbitrary limit (~1.5MB, 1.5kB/image).
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const imgCache = new LruCache(1000);
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function svgToImg (svg, format) {
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return new Promise((resolve, reject) => {
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const cacheIndex = format + svg;
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if (imgCache.has(cacheIndex)) {
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// We own a cache for this svg conversion.
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const result = imgCache.get(cacheIndex);
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resolve(result);
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return;
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}
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const buf = Buffer.from('<?xml version="1.0" encoding="UTF-8" standalone="yes"?>' + svg);
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imageMagick(buf, 'image.' + format)
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.density(90)
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.background(format === 'jpg' ? '#FFFFFF' : 'none')
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.flatten()
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.toBuffer(format, (err, data) => {
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if (err) {
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reject(err);
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} else {
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imgCache.set(cacheIndex, data);
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resolve(data);
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}
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});
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});
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};
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module.exports = svgToImg;
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// To simplify testing.
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module.exports._imgCache = imgCache;
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module.exports._imageMagick = imageMagick;
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