6e51178e73
In #2028 I suggested that we update as much of the code as possible to make consistent use of async await. This snags a bunch of the utility code and attempts to do that.
40 lines
954 B
JavaScript
40 lines
954 B
JavaScript
'use strict'
|
|
|
|
const { promisify } = require('util')
|
|
const gm = require('gm')
|
|
const LruCache = require('./lru-cache')
|
|
|
|
const imageMagick = gm.subClass({ imageMagick: true })
|
|
|
|
// The following is an arbitrary limit (~1.5MB, 1.5kB/image).
|
|
const imgCache = new LruCache(1000)
|
|
|
|
async function svgToImg(svg, format) {
|
|
const cacheIndex = `${format}${svg}`
|
|
|
|
if (imgCache.has(cacheIndex)) {
|
|
return imgCache.get(cacheIndex)
|
|
}
|
|
|
|
const svgBuffer = Buffer.from(
|
|
`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>${svg}`
|
|
)
|
|
|
|
const chain = imageMagick(svgBuffer, `image.${format}`)
|
|
.density(90)
|
|
.background(format === 'jpg' ? '#FFFFFF' : 'none')
|
|
.flatten()
|
|
const toBuffer = chain.toBuffer.bind(chain)
|
|
|
|
const data = await promisify(toBuffer)(format)
|
|
|
|
imgCache.set(cacheIndex, data)
|
|
return data
|
|
}
|
|
|
|
module.exports = svgToImg
|
|
|
|
// To simplify testing.
|
|
module.exports._imgCache = imgCache
|
|
module.exports._imageMagick = imageMagick
|