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    What is Atlasify

    Atlasify is an open-source app designed to pack graphical assets like

    • sprite images
    • textures
    • Bitmap fonts
    • True-type fonts
    • Vector graphics (SVG)

    into a single/several GPU friendly texture atlas to reduce draw call, and a spritesheet catalog json\xml to locate those assets.


    Why Atlasify

    Yes, there are many excellent packing tools like Texture packer etc. already. But the goal of Atlasify is being able to managing, generating and packing all kinds of graphical assets like above into a single atlas in one application.

    Together with proper render pipeline, this will be a perfect solution for rendering GPU accelerated vector and true-type text on any game engine.

    And most of all, it will be free and open source.

    The architecture


    Proposal Map, modules marked as ☑️ is implemented.

    Atlasify's pipeline contain these kinds of modules:


    Controllers get input assets and settings from user, and start the whole packing process. Controllers will have the following forms:

    • GUI Of cause! Will be Electron based, cross-platform, separated module. (Working in progress)
    • WebAPI More accessible from the internet. (Planned)
    • CLI Command-line interface for terminal user & CI automation. (Implemented)


    Reading different input data and generate Array of Buffer & Metric for the core controller. Buffercontaining image data and Metric containing sizing & spacing of the Buffer. Currently scheduled generators:

    • PNG/Jpeg image reader Through file I/O & Jimp
    • Multi-signed distance field font renderer msdf-bmfont-xml

      msdf-bmfont-xml will be depreciated when Atlasify is finished. I'm planning to rewrite msdf generator as a separate module using Rust.


    Store Buffer & Metric as Sheet object and do the following manipulation based on settings:

    • TrimAlpha
    • Extrude edge pixels
    • Split/Composite ARGB channels
    • Rotation


    Core module to control the whole pipeline:

    1. Aquire settings from front-end(CLI, GUI)
    2. Store array of Buffer & Metric from generator;
    3. Doing Buffer post-processing like TrimAlpha & Extrude Edge;
    4. Calling Packer to process the Metric and composing the Buffer onto the atlas;
    5. Generate the spritesheetdata object;
    6. Calling the Exporter to compile the spritesheet onto different templates;


    Atlasify uses maxrects-packer to calculate sheets position & rotation on the atlas using Maximum Rectangle Algorithm (Same as TexturePacker).


    Almost every game engine has it's own data structure to represent the spritesheets, Exporters use mustache.js template system, so it's highly customizable through modifying mst template files. Atlasify supports these types out-of-the-box:

    • bmfont/xml
    • json (font)
    • jsonHash (TexturePacker)
    • jsonArray (TexturePacker)
    • Cocos2d
    • Phaser3
    • Spine
    • Starling
    • UIKit
    • Unreal

    Engine plugins

    Atlasify extends the "standard" TexturePacker data structure to better utilize the power of GPU accelerated asset rendering like multi-channel & multi-page, and most importantly, MSDF (multi-signed distance field) based vector object. Many game engine don't support these feature yet, so it's important to implement plugins as separated modules for them. (Coming soon)


    For now only CLI controller and core module is implemented. In order to reduce package size, GUI will be a separate Repo and platform dependent installer will be publish in the Release section of Main Repo

    To install the CLI, run the following command in terminal:

    npm i -g atlasify

    Usage (CLI)

    $ atlasify --help
    Usage: cli [options] <image-files/folder>
    CLI tools to packing and compositing image files into atlas using MaxRects packing algorithm
      -V, --version            output the version number
      -o, --output <filename>  output atlas filename (Default: sprite.png)
          --load <filename>    load saved project atl file
      -m, --size <w,h>         ouput texture atlas size (Default: 2048,2048)
      -p, --padding <n>        padding between images (Default: 0)
      -b, --border <n>         space to atlas edge (Default: 0)
      -a, --auto-size          shrink atlas to the smallest possible square (Default: false)
      -t, --pot                atlas size shall be power of 2 (Default: false)
      -s, --square             atlas size shall be square (Default: false)
      -r, --rot                allow 90-degree rotation while packing (Default: false)
          --trim [n]           remove surrounding transparent pixels with optional tolerence [n] (Default: false)
          --extrude <n>        extrude edge pixels (Default: 0)
          --debug              draw debug gizmo on atlas (Default: false)
          --instant            instant packing is quicker and skip sorting (Default: false)
          --seperate-folder    Seperate bin based on folder (Default: false)
          --group-folder       Group bin based on folder (Default: false)
          --save               Save configuration for reuse (Default: false)
      -h, --help               output usage information

    Important: Atlasify is in VERY EARLY STAGE, any interface or API might change

    Examples: Packing all assets inside ./assets/actor folder into an autosize atlas with max-size 1024x1024, trim image alpha and extrude 1px on edge pixels, 2px padding and save to sprite.png & save project file for later reuse.

    $ atlasify -o sprite.png -ast -p 2 -m 1024,1024 --extrude 1 --trim --save ./assets/actor
    Saved atlas: sprite.png
    Saved spritesheet: sprite.json
    Saved configuration: sprite.atl

    Examples: Load previous project files and add all assets inside ./assets/ui folder into the same atlas with same settings except no edge pixel extrude and no trim alpha.

    $ atlasify --load ./sprite.atl --extrude 0 --no-trim ./assets/ui
    Loading project file: ./sprite.atl
    Load completed
    Saved atlas: sprite.png
    Saved spritesheet: sprite.json
    Saved configuration: sprite.atl

    Module quick start

    import { Atlasify, Option } from "atlasify";
    const opts = new Options("sprite.png", 1024, 1024);
    opts.extrude = 1;
    opts.trimAlpha = true;
    imageFiles = [
    const packer = new Atlasify(opts);
    packer.addURLs(imageFiles).then(result => {
        // Do your fileIO with results

    Please refer to ./bin/cli.js & test files(WIP) for further examples.

    API Reference

    Sorry about silly documentation with confusing Typedoc, will do a better API document in the future.


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