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index.js
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index.js
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/*
* rexpaintjs - Node.js module to load REXPaint sprites
*
* Code style:
* 2 space indents, no semicolons to finish lines, camelCase, opening braces on same line
*
* Created by John Villar for the "Ganymede Gate" sci-fi multiplayer roguelike
* Twitter: @johnvillarz
* Telegram: @chiguireitor
*
* See LICENSE for licensing details (tl;dr: ISC License)
*
* Like this! Follow me on social networks & send some Bitcoin my way if you want ;)
*
* BTC: 3H6uQfxccMRBCMyCE4u4yzEDMY4c61fFxC
*/
const zlib = require('zlib')
function rgbObj2cssHex(o) {
var r = o.r.toString(16)
var g = o.g.toString(16)
var b = o.b.toString(16)
if (r.length < 2) {
r = '0' + r
}
if (g.length < 2) {
g = '0' + g
}
if (b.length < 2) {
b = '0' + b
}
return r + g + b
}
const fromBuffer = (buf, cb) => {
let p = new Promise((resolve, reject) => {
zlib.unzip(buf, (err, buffer) => {
if (!err) {
try {
let ob = loadInflatedBuffer(buffer)
resolve(ob)
} catch (e) {
reject(e)
}
} else {
reject(err)
}
})
})
if (!cb) {
return p
} else {
p.then(ob => cb(null, ob)).catch(e => cb(e))
}
}
const loadInflatedBuffer = (buffer) => {
let ob = {
version: 0,
layers: []
}
buffer.readInt32 = buffer.readInt32LE
buffer.fixedReadUint8 = function(offset) {
// There's a bug in readUint8 that damages the buffer, so
// we read the two's complement and then clear the sign
// with this terrible, terrible hack
let v = this.readInt8(offset)
return (v<0)?256+v:v //(v >>> 0) && 0xFF
}
ob.version = buffer.readUInt32LE(0)
let numLayers = buffer.readUInt32LE(4)
let curOffset = 8
for (let i=0; i < numLayers; i++) {
let layer = {}
layer.width = buffer.readUInt32LE(curOffset)
curOffset += 4
layer.height = buffer.readUInt32LE(curOffset)
curOffset += 4
let raster = Array(layer.height * layer.width)
for (let x=0; x < layer.width; x++) {
for (let y=0; y < layer.height; y++) {
let pix = {}
pix.asciiCode = buffer.readUInt32LE(curOffset)
curOffset += 4
pix.fg = {}
pix.fg.r = buffer.fixedReadUint8(curOffset++)
pix.fg.g = buffer.fixedReadUint8(curOffset++)
pix.fg.b = buffer.fixedReadUint8(curOffset++)
pix.fg.hex = rgbObj2cssHex(pix.fg)
pix.bg = {}
pix.bg.r = buffer.fixedReadUint8(curOffset++)
pix.bg.g = buffer.fixedReadUint8(curOffset++)
pix.bg.b = buffer.fixedReadUint8(curOffset++)
pix.bg.hex = rgbObj2cssHex(pix.bg)
pix.transparent = pix.bg.r === 255 && pix.bg.g === 0 && pix.bg.b === 255
raster[x + layer.width * y] = pix
}
}
layer.raster = raster
ob.layers.push(layer)
}
return ob
}
module.exports = {
fromBuffer
}