ImageTool.js

"use strict";

const cp = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');
const Paths = require('./Paths.js');
const Files = require('./Files.js');
const log = require('./log.js');
const exec = require('./exec.js');

function getWidthAndHeight(from, to, asset, format, prealpha, callback) {
	const exe = 'kraffiti' + exec.sys();
	
	let params = ['from=' + from, 'to=' + to, 'format=' + format, 'donothing'];
	if (asset.scale !== undefined && asset.scale !== 1) {
		params.push('scale=' + asset.scale);	
	}
	let status = cp.spawnSync(path.join(__dirname, '..', '..', 'Kore', 'Tools', 'kraffiti', exe), params);
	
	if (status.status !== 0) {
		log.error('kraffiti process exited with code ' + status.status + ' when trying to get size of ' + asset.name);
		return {w: 0, h: 0};	
	}
	var lines = status.stdout.toString().split('\n');
	for (var l in lines) {
		var line = lines[l];
		if (line.startsWith('#')) {
			var numbers = line.substring(1).split('x');
			return {w: parseInt(numbers[0]), h: parseInt(numbers[1])};
		}
	}
	return {w: 0, h: 0};
}

module.exports = function (from, to, asset, format, prealpha, poweroftwo) {
	if (format === undefined) {
		if (from.toString().endsWith('.png')) format = 'png';
		else format = 'jpg';
	}

	if (format === 'jpg' && (asset.scale === undefined || asset.scale === 1) && asset.background === undefined) {
		to = to + '.jpg';
	}
	else if (format === 'pvr') {
		to = to + '.pvr';
	}
	else {
		format = 'png';
        if (prealpha) to = to + '.kng';
		else to = to + '.png';
	}
    
    let outputformat = format;
    if (format === 'png' && prealpha) {
        outputformat = 'kng';
    }

	if (fs.existsSync(to) && fs.statSync(to).mtime.getTime() > fs.statSync(from.toString()).mtime.getTime()) {
		let wh = getWidthAndHeight(from, to, asset, format, prealpha);
		asset.original_width = wh.w;
		asset.original_height = wh.h;
		return outputformat;
	}

	Files.createDirectories(Paths.get(path.dirname(to)));

	if (format === 'jpg') {
		Files.copy(Paths.get(from), Paths.get(to), true);
		let wh = getWidthAndHeight(from, to, asset, format, prealpha);
		asset.original_width = wh.w;
		asset.original_height = wh.h;
		return outputformat;
	}

	const exe = 'kraffiti' + exec.sys();
	
	let params = ['from=' + from, 'to=' + to, 'format=' + format];
	if (!poweroftwo) {
		params.push('filter=nearest');
	}
	if (prealpha) params.push('prealpha');
	if (asset.scale !== undefined && asset.scale !== 1) {
		params.push('scale=' + asset.scale);	
	}
	if (asset.background !== undefined) {
		params.push('transparent=' + ((asset.background.red << 24) | (asset.background.green << 16) | (asset.background.blue << 8) | 0xff).toString(16));
	}
	if (poweroftwo) {
		params.push('poweroftwo');
	}
	
	let status = cp.spawnSync(path.join(__dirname, '..', '..', 'Kore', 'Tools', 'kraffiti', exe), params);
		
	if (status.status !== 0) {
		log.error('kraffiti process exited with code ' + status.status + ' when trying to convert ' + asset.name);
		return outputformat;
	}
	
	const lines = status.stdout.toString().split('\n');
	for (let line of lines) {
		if (line.startsWith('#')) {
			var numbers = line.substring(1).split('x');
			asset.original_width = parseInt(numbers[0]);
			asset.original_height = parseInt(numbers[1]);
			return outputformat;
		}
	}
	return outputformat;
};