eth-blockies-rs

A lightweight library in pure Rust to get raw data of Ethereum-style blocky identicon, which can be used for generating blockies icon images, printing to terminal, etc.

Useful when getting raw RGB data of Ethereum-style blockies, as well as complete png image files.

Supports general Rust bin/lib, and WebAssembly (wasm) target.

Live Demo

• Check for the wasm demo (Ethereum-style Blockies Generator) to generate your custom blockies.

Library

Documentation

• Check for the full library documentation on docs.rs for details.

Prerequisites

• Add a dependency to Cargo.toml of a Rust crate

  [dependencies]
  eth-blockies = "1.1"

  ...or without compressed_png default crate feature:

  [dependencies]
  eth-blockies = { version = "1.1", default-features = false }

Library Basic Usage

1. Define a blockies type (size) to use

   • Make an alias type of Blockies

   use eth_blockies::{Blockies, BlockiesGenerator};
   
   // Blockies < size (const), T >
   type Icon<T> = Blockies<15, T>;

   • Cf) For Ethereum address blockies, EthBlockies is predefined as follows

   // use statement for Ethereum address blockies
   use eth_blockies::{EthBlockies, SeedInput, BlockiesGenerator};
   //   type 'EthBlockies<T>' is predefined as 'Blockies<8, T>'

---

2. Select an input seed type

   • Check for SeedInput to get full list of input seed types

   // generate blockies from various input type
   let from_string = Icon::data("eth-blockies".to_string());
   let from_byte_vec = Icon::data(vec![0x0c, 0x93, 0xa3, 0x2e]);

   • Cf) For Ethereum address seeds, apply to_ethaddr_seed() before passing as input seed

   // generate Ethereum address blockies from various input type
   
   let seed_from_str = "0xe686c14FF9C11038F2B1c9aD617F2346CFB817dC"
       .to_ethaddr_seed();
   let from_str = EthBlockies::data(seed_from_str);
   
   let seed_from_bytes = [
         0xe6, 0x86, 0xc1, 0x4f, 0xf9, 0xc1, 0x10, 0x38, 0xf2, 0xb1,
         0xc9, 0xad, 0x61, 0x7f, 0x23, 0x46, 0xcf, 0xb8, 0x17, 0xdc,
       ].to_ethaddr_seed();
   let from_bytes = EthBlockies::data(seed_from_bytes);

---

3. Select an output data type

   • Check for BlockiesGenerator to get full list of output data types

   // generate blockies in various forms
   let in_rgb_2d_arr = Icon::data("eth-blockies");
   let in_indexed_2d_arr = Icon::indexed_data("eth-blockies");
   let in_gray_2d_arr = Icon::data_mapped("eth-blockies", to_gray);
   let in_png_data_vec = Icon::png_data("eth-blockies", (128, 128));

Example

• Generate an Ethereum address blockies (with to_ethaddr_seed())

  use eth_blockies::{EthBlockies, SeedInput, BlockiesGenerator};
  
  let seed = "0xe686c14FF9C11038F2B1c9aD617F2346CFB817dC"
      .to_ethaddr_seed(); // required for Ethereum address blockies
  
  // 8x8 2D-array of (r, g, b)
  {
      let eth_blockies_from_addr = EthBlockies::data(&seed);
  }
  
  // uncompressed png data in byte vector
  {
      let eth_blockies_png_from_addr =
          EthBlockies::png_data(&seed, (128, 128));
          // use below for compressed png
          // EthBlockies::compressed_png_data(&seed, (128, 128));
  
      // write data as png file
      use std::io::Write;
      std::fs::File::create("eth-blockies.png").unwrap()
          .write_all(&eth_blockies_png_from_addr);
  }

• Generate an html img blockies element, on wasm target

  // addr to blockies data uri scheme,
  // which can be used directly in img elem 'src' or css 'url()'
  fn eth_blockies_data_uri(addr: &str) -> String {
     use eth_blockies::{EthBlockies, SeedInput, BlockiesGenerator};
  
     let addr_input = addr.to_ethaddr_seed();
     let output_dim = (128, 128);
     let data_uri_output = true;
  
     EthBlockies::png_data_base64(
        addr_input, output_dim, data_uri_output)
  }
  
  use web_sys::*;
  
  let addr = "0xe686c14FF9C11038F2B1c9aD617F2346CFB817dC";
  
  window()
     .and_then(|w| w.document())
     .and_then(|doc| doc.body().zip(doc.create_element("img").ok()))
     .and_then(|(body, img)| {
        // create a new img html element with generated data_uri
        img.set_attribute("src", &eth_blockies_data_uri(addr))
           // then attach to body
           .and_then(|_| body.append_child(&img))
           .ok()
     });

Cargo Features

• compressed_png (Enabled by default)
  • This feature enables following functions:
    • compressed_png_data()
    • compressed_png_data_base64()
  • This feature adds a following external dependency:
    • deflate crate
  • If png compression is not needed, disable this feature as follows when adding the crate:
    • E.g.
      • Shell: cargo add [email protected] --no-default-features
      • Cargo.toml: eth-blockies = { version = "1.1", default-features = false }

Binary

Install

$ cargo install eth-blockies

Binary Usage

usage: eth-blockies <seed> [output-fmt (ansi|image)] [OPTIONS...]

<seed>                 Seed to generate blockies (e.g. Ethereum wallet address)

[output-fmt]  - ansi   (Default) Generate ansi sequence of blockies,
                       usually for printing to terminal
              - image  Generate png image data of blockies

[OPTIONS...]:

        -e --ethseed   Interpret seed string as Ethereum address,
                       and canonicalize seed (to lowercase + set '0x' prefix)
                       to get Ethereum blockies correctly
        -a --ascii     (only for 'ansi' mode)   Get non-compact, big blockies
                                                with ascii (non-unicode)
        -r --raw       (only for 'image' mode)  Get uncompressed, raw png image

        -s --size=<BLOCKIES_SIZE>
                       Blockies size: # of elems per side (1-32) (Default: '8')

        -d --dimension=<WIDTH>x<HEIGHT>
                       Dimensions of output in the form of '(width)x(height)'
                       If not given, following is used (Default):
                       - ('ansi' mode)   '(blockies_size)x(blockies_size)'
                       - ('image' mode)  '128x128'

        -o --outfile=<FILENAME>
                       File name to write output
                       If the parameter is not given, stdout is used (Default)



examples:

- Outputs from following commands are all the same:
$ eth-blockies 0xe686c14ff9c11038f2b1c9ad617f2346cfb817dc
$ eth-blockies e686c14FF9C11038F2B1c9aD617F2346CFB817dC -e

- Outputs from following commands are all the same:
$ eth-blockies "generic_seed_not_ethaddr" --size=15
$ eth-blockies "generic_seed_not_ethaddr" ansi --size=15 --dimension=15x15
$ eth-blockies "generic_seed_not_ethaddr" a -s 15 -d 15x15

- Outputs from following commands are all the same:
$ eth-blockies "generic_seed" image > blockies.png
$ eth-blockies "generic_seed" i -d128x128 -oblockies.png
$ eth-blockies "generic_seed" i -d 128x128 -o blockies.png

Author

Kim Hwiwon <[email protected]>

License

The MIT License (MIT)