add TextureAtlasDesc

src/main/java/ca/blarg/gdx/graphics/atlas/json/TextureAtlasDesc.java

@@ -0,0 +1,52 @@
+package ca.blarg.gdx.graphics.atlas.json;
+
+import ca.blarg.gdx.graphics.atlas.CustomGridTextureAtlas;
+import ca.blarg.gdx.graphics.atlas.TextureAtlas;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.assets.AssetManager;
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.utils.Json;
+
+public class TextureAtlasDesc {
+	public JsonTextureAtlasDefinition load(FileHandle file) {
+		Json json = new Json();
+		return json.fromJson(JsonTextureAtlasDefinition.class, file);
+	}
+
+	public TextureAtlas create(JsonTextureAtlasDefinition definition) {
+		return create(definition, null);
+	}
+
+	public TextureAtlas create(JsonTextureAtlasDefinition definition, AssetManager assetManager) {
+		if (definition.texture == null)
+			throw new RuntimeException("No texture specified.");
+		if (definition.tiles == null || definition.tiles.size() == 0)
+			throw new RuntimeException("No tiles defined.");
+
+		Texture texture;
+		if (assetManager != null)
+			texture = assetManager.get(definition.texture, Texture.class);
+		else
+			texture = new Texture(Gdx.files.internal(definition.texture));
+
+		CustomGridTextureAtlas atlas = new CustomGridTextureAtlas(texture);
+		for (int i = 0; i < definition.tiles.size(); ++i) {
+			JsonTextureAtlasTile tile = definition.tiles.get(i);
+			// TODO: parameter value error checking
+			if (tile.autogrid)
+				atlas.addGrid(tile.x, tile.y, tile.tileWidth, tile.tileHeight, tile.numTilesX, tile.numTilesY, tile.border);
+			else
+				atlas.add(tile.x, tile.y, tile.width, tile.height);
+		}
+
+		if (definition.animations != null && definition.animations.size() > 0) {
+			for (int i = 0; i < definition.animations.size(); ++i) {
+				JsonTextureAtlasAnimation animation = definition.animations.get(i);
+				atlas.addAnimation(animation.name, animation.tileIndex, animation.startIndex, animation.endIndex, animation.delay, animation.loop);
+			}
+		}
+
+		return atlas;
+	}
+}