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overlap2d-runtime-libgdx provides functionality to load, manipulate and render scenes generated by Overlap2D.
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package com.uwsoft.editor.renderer.utils;

import java.io.File;
import java.util.HashMap;
import java.util.Set;
import java.util.Map.Entry;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.PixmapPacker;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.TextureAtlas;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.utils.Disposable;
import com.badlogic.gdx.utils.GdxRuntimeException;
import com.brashmonkey.spriter.Data;
import com.brashmonkey.spriter.FileReference;
import com.brashmonkey.spriter.Loader;

public class LibGdxLoader extends Loader implements Disposable{
	
	public static int standardAtlasWidth = 2048, standardAtlasHeight = 2048;
	
	private PixmapPacker packer;
	private HashMap pixmaps;	
	private HashMap pixmapsToDispose;
	private boolean pack;
	private int atlasWidth, atlasHeight;
	
	public LibGdxLoader(Data data){
		this(data, true);
	}
	
	public LibGdxLoader(Data data, boolean pack){
		this(data, standardAtlasWidth, standardAtlasHeight);
		this.pack = pack;
	}

	public LibGdxLoader(Data data, int atlasWidth, int atlasHeight) {
		super(data);
		this.pack = true;
		this.atlasWidth = atlasWidth;
		this.atlasHeight = atlasHeight;
		this.pixmaps = new HashMap();
		this.pixmapsToDispose = new HashMap();
	}

	@Override
	protected Sprite loadResource(FileReference ref) {
		FileHandle f;
		
		String filename = new File(data.getFile(ref).name).getName();
		//String path = super.root+"/"+data.getFile(ref).name;
		String path = super.root+"/"+filename;
		System.out.println(path);
		switch(Gdx.app.getType()){
		case iOS: f = Gdx.files.absolute(path); break;
		default: f = Gdx.files.internal(path); break;
		}
		
		if(!f.exists()) throw new GdxRuntimeException("Could not find file handle "+ path + "! Please check your paths.");
		if(this.packer == null && this.pack)
			this.packer = new PixmapPacker(this.atlasWidth, this.atlasHeight, Pixmap.Format.RGBA8888, 2, true);
		final Pixmap pix = new Pixmap(f);
		this.pixmaps.put(ref, pix);
		return null;
	}
	
	/**
	 * Packs all loaded sprites into an atlas. Has to called after loading all sprites.
	 */
	protected void generatePackedSprites(){
		if(this.packer == null) return;
		TextureAtlas tex = this.packer.generateTextureAtlas(TextureFilter.Linear, TextureFilter.Linear, false);
		Set keys = this.resources.keySet();
		this.disposeNonPackedTextures();
		for(FileReference ref: keys){
			TextureRegion texReg = tex.findRegion(data.getFile(ref).name);
			texReg.setRegionWidth((int) data.getFile(ref).size.width);
			texReg.setRegionHeight((int) data.getFile(ref).size.height);
			super.resources.put(ref, new Sprite(texReg));
		}
	}
	
	private void disposeNonPackedTextures(){
		for(Entry entry: super.resources.entrySet())
			entry.getValue().getTexture().dispose();
	}

	@Override
	public void dispose() {
		if(this.pack && this.packer != null) this.packer.dispose();
		else this.disposeNonPackedTextures();
		super.dispose();
	}
	
	protected void finishLoading() {
		Set refs = this.resources.keySet();
		for(FileReference ref: refs){
			Pixmap pix = this.pixmaps.get(ref);
			this.pixmapsToDispose.put(pix, false);
			this.createSprite(ref, pix);
			
			if(this.packer != null)	packer.pack(data.getFile(ref).name, pix);
		}
		if(this.pack) generatePackedSprites();
		this.disposePixmaps();
	}
	
	protected void createSprite(FileReference ref, Pixmap image){
		Texture tex = new Texture(image);
		tex.setFilter(TextureFilter.Linear, TextureFilter.Linear);
		int width = (int) data.getFile(ref.folder, ref.file).size.width;
		int height = (int) data.getFile(ref.folder, ref.file).size.height;
		TextureRegion texRegion = new TextureRegion(tex, width, height);
		super.resources.put(ref, new Sprite(texRegion));
		pixmapsToDispose.put(image, true);
	}
	
	protected void disposePixmaps(){
		Pixmap[] maps = new Pixmap[this.pixmapsToDispose.size()];
		this.pixmapsToDispose.keySet().toArray(maps);
		for(Pixmap pix: maps){
			try{
				while(pixmapsToDispose.get(pix)){
					pix.dispose();
					pixmapsToDispose.put(pix, false);
				}
			} catch(GdxRuntimeException e){
				System.err.println("Pixmap was already disposed!");
			}
		}
		pixmapsToDispose.clear();
	}
	
}