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Rearrange code (self-review)

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Cadence Ember 2024-03-04 17:02:38 +13:00
parent c5d6c5e4c7
commit 47ac49a855
16 changed files with 275 additions and 74 deletions
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11
d2m/converters/lottie.js
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@ -1,5 +1,6 @@
// @ts-check
const assert = require("assert")
const stream = require("stream")
const {PNG} = require("pngjs")
@ -27,7 +28,7 @@ async function convert(text) {
/** @type RlottieWasm */
const rh = new r.RlottieWasm()
const status = rh.load(text)
if (!status) throw new Error(`Rlottie unable to load ${text.length} byte data file.`)
assert(status, `Rlottie unable to load ${text.length} byte data file.`)
const rendered = rh.render(0, SIZE, SIZE)
let png = new PNG({
width: SIZE,
@ -38,11 +39,9 @@ async function convert(text) {
inputHasAlpha: true,
})
png.data = Buffer.from(rendered)
// The transform stream is necessary because PNG requires me to pipe it somewhere before this event loop ends
const resultStream = png.pack()
const p = new stream.PassThrough()
resultStream.pipe(p)
return p
// png.pack() is a bad stream and will throw away any data it sends if it's not connected to a destination straight away.
// We use Duplex.from to convert it into a good stream.
return stream.Duplex.from(png.pack())
}
module.exports.convert = convert