puzzlescript_image_generator.js

let canvas = document.createElement('canvas');
let ctx = canvas.getContext('2d');
let image = new Image();
image.src = 'base64/...';
canvas.width = image.width;
canvas.height = image.height;
ctx.drawImage(image, 0, 0);

var hexDigits = new Array
        ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"); 

function rgb2hex(rgb) {
 return "#" + hex(rgb[0]) + hex(rgb[1]) + hex(rgb[2]);
}

function hex(x) {
  return isNaN(x) ? "00" : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
 }

tiles_per_line = (image.width / 5);
out = '';
emoji_out = '';
room_out = '';
layer_out = '';
chars = '';

function get_char(base_code) {
	let char = String.fromCharCode(base_code).toLowerCase();
	if(chars.indexOf(char) == -1) {
		chars += char;
		return char;
    }

	return get_char(base_code + 1);
}

for(let tile = 0; tile < (image.width * image.height / 25); tile++)
{
	let base_x = (tile % tiles_per_line) * 5
	let base_y = Math.floor(tile / tiles_per_line) * 5
	let colors = [];

	out += '\nGSMuralTile' + tile + '\n';
	let tout = '';
	for(let y = 0; y < 5; y++) {
		for(let x = 0; x < 5; x++)
        {
			let pixel_color = canvas.getContext('2d').getImageData(base_x + x, base_y + y, 1, 1).data;
			if(pixel_color[3] == 255) {
                let hex_color = rgb2hex(pixel_color);
                let index = colors.indexOf(hex_color);
                if(index == -1)
                {
                    index = colors.length
                    colors.push(hex_color);
                }

                tout += index;
            } else {
				tout += '.';
            }
        }
		tout += '\n';
    }
	out += colors.join(' ') + '\n' + tout;
	let char = get_char(1000 + tile);
	emoji_out += char + ' = GSMuralTile' + tile + '\n';
	room_out += (base_x == 0 ? '\n' : '') + char;
	layer_out += 'GSMuralTile' + tile + ', ';
}
out += '\n\n' + emoji_out + '\n\n' + room_out + '\n\n' + layer_out;