PreviewImageConverter.java

/*
 * Copyright (c) 2015 - 2017
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
package jsettlers.main.android.core.ui;

import jsettlers.common.Color;
import jsettlers.logic.map.loading.newmap.MapFileHeader;

import android.graphics.Bitmap;
import io.reactivex.Single;

public class PreviewImageConverter {
	public static Single<Bitmap> toBitmap(short[] data) {
		return Single.create(e -> e.onSuccess(convert(data)));
	}

	public static Bitmap convert(short[] data) {
		if (data == null) {
			Bitmap b = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
			b.setPixel(0, 0, 0xffffffff);
			return b;
		}

		if (data.length != MapFileHeader.PREVIEW_IMAGE_SIZE * MapFileHeader.PREVIEW_IMAGE_SIZE) {
			throw new IllegalArgumentException();
		}

		Bitmap b = Bitmap.createBitmap(MapFileHeader.PREVIEW_IMAGE_SIZE * 3 / 2, MapFileHeader.PREVIEW_IMAGE_SIZE, Bitmap.Config.ARGB_8888);

		for (int y = 0; y < MapFileHeader.PREVIEW_IMAGE_SIZE; y++) {
			int offset = (MapFileHeader.PREVIEW_IMAGE_SIZE - y) / 2;
			for (int x = 0; x < MapFileHeader.PREVIEW_IMAGE_SIZE; x++) {
				b.setPixel(offset + x, y, Color.fromShort(data[x + y * MapFileHeader.PREVIEW_IMAGE_SIZE]).getARGB());
			}
		}
		return b;
	}
}