Zoomer.java

/*******************************************************************************
 * Copyright 2012 bmanuel
 * 
 * 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.bitfire.postprocessing.effects;

import com.badlogic.gdx.graphics.glutils.FrameBuffer;
import com.badlogic.gdx.math.Vector2;
import com.bitfire.postprocessing.PostProcessorEffect;
import com.bitfire.postprocessing.filters.RadialBlur;
import com.bitfire.postprocessing.filters.Zoom;

/** Implements a zooming effect: either a radial blur filter or a zoom filter is used. */
public final class Zoomer extends PostProcessorEffect {
	private boolean doRadial = false;
	private RadialBlur radialBlur = null;
	private Zoom zoom = null;
	private float oneOnW, oneOnH;
	private float userOriginX, userOriginY;

	/** Creating a Zoomer specifying the radial blur quality will enable radial blur */
	public Zoomer (int viewportWidth, int viewportHeight, RadialBlur.Quality quality) {
		setup(viewportWidth, viewportHeight, new RadialBlur(quality));
	}

	/** Creating a Zoomer without any parameter will use plain simple zooming */
	public Zoomer (int viewportWidth, int viewportHeight) {
		setup(viewportWidth, viewportHeight, null);
	}

	private void setup (int viewportWidth, int viewportHeight, RadialBlur radialBlurFilter) {
		radialBlur = radialBlurFilter;
		if (radialBlur != null) {
			doRadial = true;
			zoom = null;
		} else {
			doRadial = false;
			zoom = new Zoom();
		}

		oneOnW = 1f / (float)viewportWidth;
		oneOnH = 1f / (float)viewportHeight;
	}

	/** Specify the zoom origin, in screen coordinates. */
	public void setOrigin (Vector2 o) {
		setOrigin(o.x, o.y);
	}

	/** Specify the zoom origin, in screen coordinates. */
	public void setOrigin (float x, float y) {
		userOriginX = x;
		userOriginY = y;

		if (doRadial) {
			radialBlur.setOrigin(x * oneOnW, 1f - y * oneOnH);
		} else {
			zoom.setOrigin(x * oneOnW, 1f - y * oneOnH);
		}
	}

	public void setBlurStrength (float strength) {
		if (doRadial) {
			radialBlur.setStrength(strength);
		}
	}

	public void setZoom (float zoom) {
		if (doRadial) {
			radialBlur.setZoom(1f / zoom);
		} else {
			this.zoom.setZoom(1f / zoom);
		}
	}

	public float getZoom () {
		if (doRadial) {
			return 1f / radialBlur.getZoom();
		} else {
			return 1f / zoom.getZoom();
		}
	}

	public float getBlurStrength () {
		if (doRadial) {
			return radialBlur.getStrength();
		}

		return -1;
	}

	public float getOriginX () {
		return userOriginX;
	}

	public float getOriginY () {
		return userOriginY;
	}

	@Override
	public void dispose () {
		if (radialBlur != null) {
			radialBlur.dispose();
			radialBlur = null;
		}

		if (zoom != null) {
			zoom.dispose();
			zoom = null;
		}
	}

	@Override
	public void rebind () {
		radialBlur.rebind();
	}

	@Override
	public void render (FrameBuffer src, FrameBuffer dest) {
		restoreViewport(dest);
		if (doRadial) {
			radialBlur.setInput(src).setOutput(dest).render();
		} else {
			zoom.setInput(src).setOutput(dest).render();
		}
	}
}