martinpeck

These two scripts can help when building assets for iMessage sticker packs.

WARNING

• Both scripts worked at the time I authored them, for my very specific needs (taking 1024x1024 PNG original art files, and resizing them on my MacBook).
• Both scripts use convert which is installed as part of ImageMagik. https://apple.stackexchange.com/questions/335635/where-is-the-convert-command-in-macos
• The AppStore requirements change frequently (as new devices are launched) and I've not updated these scripts in a very long time

build_icons.sh

Generates the icons required for the App Store

martinpeck

import click
import json


@click.command()
@click.argument('file', type=click.File('rb'))
def dostuff(file):
    config = json.load(file)
    print(config[0]["location"])
    print(config[0]["saveas"])

martinpeck

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

martinpeck

#!/bin/bash

# takes src.png (assume 1024x1024) and creates the icons required for an iMessage sticker pack
# run on mac: sh build_icons.sh src.png


convert $1 -resize 1024x768^ -background white -gravity center  -extent 1024x768 messages-app-store-1024x768.png # aspect ratio 1.333
convert $1 -resize 96x72^    -background white -gravity center  -extent 96x72    messages-32x24@3x.png           # aspect ratio 1.333
convert $1 -resize 64x48^    -background white -gravity center  -extent 64x48    messages-32x24@2x.png           # aspect ratio 1.333
convert $1 -resize 81x60^    -background white -gravity center  -extent 81x60    messages-27x20@3x.png           # aspect ratio 1.353