free-tex-packer-core

Core Free texture packer module

Install

$ npm install free-tex-packer-core

Basic usage

let texturePacker = require("free-tex-packer-core");

let images = [];

images.push({path: "img1.png", contents: fs.readFileSync("./img1.png")});
images.push({path: "img2.png", contents: fs.readFileSync("./img2.png")});
images.push({path: "img3.png", contents: fs.readFileSync("./img3.png")});

texturePacker(images, null, (files, error) => {
    if (error) {
        console.error('Packaging failed', error);
    } else {  
        for(let item of files) {
            console.log(item.name, item.buffer);
        }
    }
});

Asynchronous usage

Async/await

const { packAsync } = require('free-tex-packer-core');

const images = [
    {path: "img1.png", contents: fs.readFileSync("./img1.png")},
    {path: "img2.png", contents: fs.readFileSync("./img2.png")},
    {path: "img3.png", contents: fs.readFileSync("./img3.png")}
];

async function packImages() {
    try {
        const files = await packAsync(images, null);
        for(let item of files) {
            console.log(item.name, item.buffer);
        }
    }
    catch(error) {
        console.log(error);
    }
}

Promises

function packImages() {
    packAsync(images, null)
        .then((files) => {
            for(let item of files) {
                console.log(item.name, item.buffer);
            }
        })
        .catch((error) => console.log(error));
}

Advanced usage

Use packer options object

let texturePacker = require("free-tex-packer-core");

let options = {
    textureName: "my-texture",
    width: 1024,
    height: 1024,
    fixedSize: false,
    padding: 2,
    allowRotation: true,
    detectIdentical: true,
    allowTrim: true,
    exporter: "Pixi",
    removeFileExtension: true,
    prependFolderName: true
};

let images = [];

images.push({path: "img1.png", contents: fs.readFileSync("./img1.png")});
images.push({path: "img2.png", contents: fs.readFileSync("./img2.png")});
images.push({path: "img3.png", contents: fs.readFileSync("./img3.png")});

texturePacker(images, options, (files, error) => {
    if (error) {
        console.error('Packaging failed', error);
    } else {  
        for(let item of files) {
            console.log(item.name, item.buffer);
        }
    }
});

Available options

textureName - name of output files. Default: pack-result
width - max single texture width. Default: 2048
height - max single texture height. Default: 2048
fixedSize - fix texture size. Default: false
powerOfTwo - force power of two textures sizes. Default: false
padding - spaces in pixels around images. Default: 0
extrude - extrude border pixels size around images. Default: 0
allowRotation - allow image rotation. Default: true
detectIdentical - allow detect identical images. Default: true
allowTrim - allow trim images. Default: true
trimMode - trim or crop. Default: trim
alphaThreshold - threshold alpha value. Default: 0
removeFileExtension - remove file extensions from frame names. Default: false
prependFolderName - prepend folder name to frame names. Default: true
textureFormat - output file format (png or jpg). Default: png
base64Export - export texture as base64 string to atlas meta tag. Default: false
scale - scale size and positions in atlas. Default: 1
scaleMethod - texture scaling method (BILINEAR, NEAREST_NEIGHBOR, BICUBIC, HERMITE, BEZIER). Default: BILINEAR
tinify - tinify texture using TinyPNG. Default: false
tinifyKey - TinyPNG key. Default: ""
packer - type of packer (MaxRectsBin, MaxRectsPacker or OptimalPacker). Default: MaxRectsBin, recommended OptimalPacker
packerMethod - name of pack method (MaxRectsBin: BestShortSideFit, BestLongSideFit, BestAreaFit, BottomLeftRule, ContactPointRule. MaxRectsPacker: Smart, Square, SmartSquare, SmartArea, SquareArea, SmartSquareArea). Default: BestShortSideFit
exporter - name of predefined exporter (JsonHash, JsonArray, Css, OldCss, Pixi, GodotAtlas, GodotTileset, PhaserHash, PhaserArray, Phaser3, XML, Starling, Cocos2d, Spine, Unreal, UIKit, Unity3D), or custom exporter (see below). Default: JsonHash
filter - name of bitmap filter (grayscale, mask or none). Default: none
appInfo - external app info. Required fields: url and version. Default: null

Custom exporter

Exporter property can be object. Fields:

fileExt - files extension
template - path to template file or
content - content of template

Free texture packer uses mustache template engine.

There are 3 objects passed to template:

rects (Array) list of sprites for export

prop	type	description
name	String	sprite name
frame	Object	frame info (x, y, w, h, hw, hh)
rotated	Boolean	sprite rotation flag
trimmed	Boolean	sprite trimmed flag
spriteSourceSize	Object	sprite source size (x, y, w, h)
sourceSize	Object	original size (w, h)
first	Boolean	first element in array flag
last	Boolean	last element in array flag

config (Object) current export config

prop	type	description
imageWidth	Number	texture width
imageHeight	Number	texture height
scale	Number	texture scale
format	String	texture format
imageName	String	texture name
base64Export	Boolean	base64 export flag
base64Prefix	String	prefix for base64 string
imageData	String	base64 image data

appInfo (Object) application info

prop	type	description
displayName	String	App name
version	String	App version
url	String	App url

Template example:

{
  "frames": {
    {{#rects}}
    "{{{name}}}": {
      "frame": {
        "x": {{frame.x}},
        "y": {{frame.y}},
        "w": {{frame.w}},
        "h": {{frame.h}}
      },
      "rotated": {{rotated}},
      "trimmed": {{trimmed}},
      "spriteSourceSize": {
        "x": {{spriteSourceSize.x}},
        "y": {{spriteSourceSize.y}},
        "w": {{spriteSourceSize.w}},
        "h": {{spriteSourceSize.h}}
      },
      "sourceSize": {
        "w": {{sourceSize.w}},
        "h": {{sourceSize.h}}
      },
      "pivot": {
        "x": 0.5,
        "y": 0.5
      }
    }{{^last}},{{/last}}
    {{/rects}}
  },
  "meta": {
    "app": "{{{appInfo.url}}}",
    "version": "{{appInfo.version}}",
    "image": "{{config.imageName}}",
    "format": "{{config.format}}",
    "size": {
      "w": {{config.imageWidth}},
      "h": {{config.imageHeight}}
    },
    "scale": {{config.scale}}
  }
}

Custom template usage example

let texturePacker = require("free-tex-packer-core");

let images = [];

images.push({path: "img1.png", contents: fs.readFileSync("./img1.png")});
images.push({path: "img2.png", contents: fs.readFileSync("./img2.png")});
images.push({path: "img3.png", contents: fs.readFileSync("./img3.png")});

let exporter = {
    fileExt: "json",
    template: "./MyTemplate.mst"
};

texturePacker(images, {exporter: exporter}, (files, error) => {
    if (error) {
        console.error('Packaging failed', error);
    } else {  
        for(let item of files) {
            console.log(item.name, item.buffer);
        }
    }
});

Used libs

Jimp - https://github.com/oliver-moran/jimp
mustache.js - https://github.com/janl/mustache.js/
tinify - https://github.com/tinify/tinify-nodejs
MaxRectsPacker - https://github.com/soimy/maxrects-packer

License: MIT

zaniar/free-tex-packer-core