/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests;

import java.io.IOException;
import java.util.zip.Deflater;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.PixmapIO.PNG;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.tests.utils.GdxTest;
import com.badlogic.gdx.utils.ScreenUtils;

public class PngTest extends GdxTest {
	SpriteBatch batch;
	Texture badlogic, screenshot;

	public void create () {
		batch = new SpriteBatch();
		badlogic = new Texture(Gdx.files.internal("data/badlogic.jpg"));
	}

	public void render () {
		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
		batch.begin();
		if (screenshot == null) {
			int width = Gdx.graphics.getWidth(), height = Gdx.graphics.getHeight();
			for (int i = 0; i < 100; i++)
				batch.draw(badlogic, MathUtils.random(width), MathUtils.random(height));
			batch.flush();

			FileHandle file = FileHandle.tempFile("screenshot-");
			System.out.println(file.file().getAbsolutePath());
			Pixmap pixmap = ScreenUtils.getFrameBufferPixmap(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
			try {
				PNG writer = new PNG((int)(pixmap.getWidth() * pixmap.getHeight() * 1.5f));
				// writer.setCompression(Deflater.NO_COMPRESSION);
				writer.write(file, pixmap);
				writer.write(file, pixmap); // Write twice to make sure the object is reusable.
				writer.dispose();
			} catch (IOException ex) {
				throw new RuntimeException(ex);
			}
			screenshot = new Texture(file);
		}
		batch.draw(screenshot, 0, 0);
		batch.end();
	}
}