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artpacks.js
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artpacks.js
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'use strict';
const ZIP = require('zip');
const path = require('path');
const fs = require('fs');
const binaryXHR = require('binary-xhr');
const EventEmitter = (require('events').EventEmitter);
const getFrames = require('mcmeta');
const getPixels = require('get-pixels');
const savePixels = require('save-pixels');
const graycolorize = require('graycolorize');
// convert UTF-8 ArrayBuffer to string - see http://stackoverflow.com/questions/17191945/conversion-between-utf-8-arraybuffer-and-string
function arrayBufferToString(arrayBuffer) {
return String.fromCharCode.apply(null, new Uint8Array(arrayBuffer));
}
class ArtPacks extends EventEmitter {
constructor(packs) {
super();
this.packs = [];
this.pending = {};
this.blobURLs = {};
this.shouldColorize = { 'grass_top':true, 'leaves_oak':true }; // TODO: more comprehensive, configurable
this.mimeTypes = {
textures: 'image/png',
sounds: 'audio/ogg'
};
this.setMaxListeners(0); // since each texture can this.on 'loadedAll'.. it adds up
for (let pack of packs) {
this.addPack(pack);
}
}
addPack(x, name) {
if (x instanceof ArrayBuffer) {
const rawZipArchiveData = x;
this.packs.push(new ArtPackArchive(rawZipArchiveData, name ? name : `(${rawZipArchiveData.byteLength} raw bytes)`));
this.refresh();
this.emit('loadedRaw', rawZipArchiveData);
this.emit('loadedAll');
} else if (typeof x === 'string') {
const url = x;
if (window.XMLHttpRequest === undefined) {
throw new Error(`artpacks unsupported addPack url ${x} without XMLHttpRequest`);
}
this.pending[url] = true;
const packIndex = this.packs.length;
this.packs[packIndex] = null; // save place while loading
this.emit('loadingURL', url);
binaryXHR(url, (err, packData) => {
if (this.packs[packIndex] != null) {
console.log(`artpacks warning: index ${packIndex} occupied, expected to be empty while loading ${url}`);
}
if (err || !packData) {
console.log(`artpack failed to load #${packIndex} - ${url}: ${err}`);
this.emit('failedURL', url, err);
delete this.pending[url];
return;
// this.packs[packIndex] stays null
}
try {
this.packs[packIndex] = new ArtPackArchive(packData, url);
this.refresh();
} catch (e) {
console.log(`artpack failed to parse #${packIndex} - ${url}: ${e}`);
this.emit('failedURL', url, e);
// fallthrough
}
delete this.pending[url];
console.log('artpacks loaded pack:',url);
this.emit('loadedURL', url);
if (Object.keys(this.pending).length === 0) {
this.emit('loadedAll');
}
});
} else {
const pack = x;
this.emit('loadedPack', pack);
this.emit('loadedAll');
this.packs.push(pack); // assumed to be ArtPackArchive
this.refresh();
}
}
// swap the ordering of two loaded packs
swap(i, j) {
if (i === j) return;
const temp = this.packs[i];
this.packs[i] = this.packs[j];
this.packs[j] = temp;
this.refresh();
}
colorize(img, onload, onerror) {
getPixels(img.src, (err, pixels) => {
if (err) {
return onerror(err, img);
}
// see https://en.wikipedia.org/wiki/HSL_color_space#HSV_.28Hue_Saturation_Value.29
if (this.colorMap === undefined) {
this.colorMap = graycolorize.generateMap(120/360, 0.7);
}
graycolorize(pixels, this.colorMap);
const img2 = new Image();
img2.src = savePixels(pixels, 'canvas').toDataURL();
img2.onload = () => onload(img2);
img2.onerror = (err) => onerror(err, img2);
});
}
getTextureNdarray(name, onload, onerror) {
function onload2(img) {
if (Array.isArray(img)) {
// TODO: support multiple textures (animation frame strips), add another dimension to the ndarray? (always)
// currently, only using first frame
img = img[0];
}
// get as [m,n,4] RGBA ndarray
getPixelsx(img.src, (err, pixels) => {
if (err) {
return onerror(err, img)
}
onload(pixels);
});
}
this.getTextureImage(name, onload2, onerror);
}
// TODO: refactor to operate on ndarray directly
getTextureImage(name, onload, onerror) {
const img = new Image();
const load = () => {
const url = this.getTexture(name);
if (!url) {
return onerror(`no such texture in artpacks: ${name}`, img);
}
img.src = url;
img.onload = () => {
if (this.shouldColorize[name]) {
return this.colorize(img, onload, onerror);
}
if (img.height === img.width) {
// assumed static image
onload(img);
} else {
// possible multi-frame texture strip; read .mcmeta file
const json = this.getMeta(name, 'textures');
console.log('.mcmeta=',json);
getPixels(img.src, (err, pixels) => {
if (err) {
return onerror(err, img);
}
const frames = getFrames(pixels, json);
let loaded = 0;
let frameImgs = [];
// load each frame
frames.forEach((frame) => {
const frameImg = new Image();
frameImg.src = frame.image;
frameImg.onerror = (err) => {
onerror(err, img, frameImg);
};
frameImg.onload = () => {
frameImgs.push(frameImg);
if (frameImgs.length === frames.length) {
if (frameImgs.length === 1) {
onload(frameImgs[0]);
} else {
// array of frames
onload(frameImgs);
}
}
}
});
});
}
}
img.onerror = (err) => {
onerror(err, img);
}
};
if (this.isQuiescent()) {
load();
} else {
this.on('loadedAll', load);
}
}
getTexture(name) {
return this.getURL(name, 'textures');
}
getSound(name) {
return this.getURL(name, 'sounds');
}
getURL(name, type) {
// already have URL?
let url = this.blobURLs[type + ' ' + name];
if (url !== undefined) return url;
// get a blob
const blob = this.getBlob(name, type);
if (blob === undefined) return undefined;
// create URL and return
url = URL.createObjectURL(blob);
this.blobURLs[type + ' ' + name] = url;
return url;
}
getBlob(name, type) {
const arrayBuffer = this.getArrayBuffer(name, type, false);
if (arrayBuffer === undefined) return undefined;
return new Blob([arrayBuffer], {type: this.mimeTypes[type]});
}
getArrayBuffer(name, type, isMeta) {
for (let pack of this.packs.slice(0).reverse()) { // search packs in reverse order
if (!pack) continue;
const arrayBuffer = pack.getArrayBuffer(name, type, isMeta);
if (arrayBuffer !== undefined) return arrayBuffer;
}
return undefined;
}
getMeta(name, type) {
const arrayBuffer = this.getArrayBuffer(name, type, true);
if (arrayBuffer === undefined) return undefined;
const encodedString = arrayBufferToString(arrayBuffer);
const decodedString = decodeURIComponent(escape(encodedString));
const json = JSON.parse(decodedString);
return json;
}
// revoke all URLs to reload from packs list
refresh() {
for (let url in this.blobURLs) {
URL.revokeObjectURL(url);
}
this.blobURLs = [];
this.emit('refresh');
}
// delete all loaded packs
clear() {
this.packs = [];
this.refresh();
}
getLoadedPacks() {
const ret = [];
let pack;
for (pack of this.packs.slice(0).reverse()) {
if (pack !== undefined) ret.push(pack);
}
return ret;
}
isQuiescent() { // have at least 1 pack loaded, and no more left to go
return this.getLoadedPacks().length > 0 && Object.keys(this.pending).length === 0;
}
}
// optional 'namespace:' prefix (as in namespace:foo), defaults to anything
function splitNamespace(name) {
const a = name.split(':');
let namespace;
if (a.length > 1) {
namespace = a[0];
name = a[1];
}
if (namespace === undefined) {
namespace = '*';
}
return [namespace, name];
}
class ArtPackArchive {
// Load pack given binary data + optional informative name
constructor(packData) {
this.name = name;
if (packData instanceof ArrayBuffer) {
// zip with bops uses Uint8Array data view
packData = new Uint8Array(packData);
}
this.zip = new ZIP.Reader(packData);
this.zipEntries = {};
this.zip.forEach((entry) => {
this.zipEntries[entry.getName()] = entry;
});
this.namespaces = this.scanNamespaces();
}
toString() {
if (this.name) {
return this.name;
} else {
return 'ArtPack'; // TODO: maybe call getDescription()
}
}
// Get list of "namespaces" with a resourcepack
// all of assets/<foo>
scanNamespaces() { // TODO: only if RP
const namespaces = {};
for (let zipEntryName of Object.keys(this.zipEntries)) {
const parts = zipEntryName.split(path.sep)
if (parts.length < 2) continue;
if (parts[0] !== 'assets') continue;
if (parts[1].length === 0) continue;
namespaces[parts[1]] = true;
}
return Object.keys(namespaces);
}
nameToPath(type, fullname) {
if (type === 'textures') {
const a = fullname.split('/');
let category, partname;
if (a.length > 1) {
category = a[0];
partname = a[1];
}
// optional category/ prefix, defaults to blocks, i/ shortcut
if (category === 'i') category = 'items';
if (category === undefined) category = 'blocks';
if (partname === undefined) partname = fullname;
const parts = splitNamespace(partname);
const namespace = parts[0];
const basename = parts[1];
const pathRP = `assets/${namespace}/textures/${category}/${basename}.png`;
console.log('artpacks texture:',fullname,[category,namespace,basename]);
return pathRP;
} else if (type === 'sounds') {
const parts = splitNamespace(fullname);
const namespace = parts[0];
const basename = parts[1];
// TODO: optional categories to search all
const pathRP = `assets/${namespace}/sounds/${name}.ogg`;
return pathRP;
} else {
throw new Error(`no such type: ${type} of ${fullname}`);
}
}
getArrayBuffer(name, type, isMeta) {
if (isMeta === undefined) isMeta = false;
if (typeof name !== 'string') {
console.log('invalid artpacks resource name (not a string) requested:',name,type)
throw new Error(`invalid artpacks resource name (not a string) requested: ${JSON.stringify(name)} of ${type}`);
}
let pathRP = this.nameToPath(type, name);
if (isMeta) pathRP += '.mcmeta';
let found = false;
// expand namespace wildcard, if any
let tryPaths = [];
if (pathRP.indexOf('*') === -1) {
tryPaths.push(pathRP);
} else {
for (let namespace of this.namespaces) {
tryPaths.push(pathRP.replace('*', namespace));
}
}
for (let tryPath of tryPaths) {
const zipEntry = this.zipEntries[tryPath];
if (zipEntry !== undefined) {
return zipEntry.getData();
}
}
return undefined; // not found
}
getFixedPathArrayBuffer(path) {
if (this.zipEntries[path]) {
return this.zipEntries[path].getData();
} else {
return undefined;
}
}
getPackLogo() {
if (this.logoURL) {
return this.logoURL;
}
const arrayBuffer = this.getFixedPathArrayBuffer('pack.png');
if (arrayBuffer !== undefined) {
const blob = new Blob([arrayBuffer], {type: 'image/png'});
this.logoURL = URL.createObjectURL(blob);
} else {
// placeholder for no pack image
// solid gray 2x2 processed with `pngcrush -rem alla -rem text` (for some reason, 1x1 doesn't crush)
this.logoURL = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEUlEQVQYV2N48uTJfxBmgDEAg3wOrbpADeoAAAAASUVORK5CYII=';
}
return this.logoURL;
}
getPackJSON() {
if (this.json !== undefined) return this.json;
const arrayBuffer = this.getFixedPathArrayBuffer('pack.mcmeta');
if (arrayBuffer === undefined) return {};
const str = arrayBufferToString(arrayBuffer);
this.json = JSON.parse(str);
return this.json;
}
getDescription() {
const json = this.getPackJSON();
if (json) {
const pack = json.pack;
if (pack) {
const description = pack.description;
return description;
}
}
return this.name;
}
}
module.exports = (opts) => {
return new ArtPacks(opts);
}