Flappy Bird's atlas.png/txt simple extractor. — Extracts assets from atlas.png into separate files based on assets definitions from atlas.txt

atlas_extract.php

<?php

$atlas_file = file_get_contents('atlas.txt');

// Hardcoded source image size
$x = 1024;
$y = 1024;

@mkdir('out');

// https://www.php.net/manual/en/imagick.writeimage.php
// https://www.php.net/manual/en/imagick.cropimage.php
function cropImage($imagePath, $destination, $width, $height, $startX, $startY) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->cropImage($width, $height, $startX, $startY);
    $imagick->writeImage($destination);
}

foreach (explode("\n", $atlas_file) as $line) {
    $line = trim($line);
    
    if (!empty($line)) {
        $parts = explode(' ', $line);
        
        cropImage('atlas.png', 'out/' . $parts[0] . '.png', $parts[1], $parts[2], $parts[3]*$x, $parts[4]*$y);
    }
}