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