RoundedVignetteBitmapDisplayer.java

/*******************************************************************************
 * Copyright 2013 Sergey Tarasevich
 *
 * 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.smartandroid.sa.zUImageLoader.core.display;

import android.graphics.Bitmap;
import android.graphics.ComposeShader;
import android.graphics.Matrix;
import android.graphics.PorterDuff;
import android.graphics.RadialGradient;
import android.graphics.Rect;
import android.graphics.Shader;

import com.smartandroid.sa.zUImageLoader.core.assist.LoadedFrom;
import com.smartandroid.sa.zUImageLoader.core.imageaware.ImageAware;
import com.smartandroid.sa.zUImageLoader.core.imageaware.ImageViewAware;

/**
 * Can display bitmap with rounded corners and vignette effect. This
 * implementation works only with ImageViews wrapped in ImageViewAware. <br />
 * This implementation is inspired by <a href=
 * "http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/"
 * > Romain Guy's article</a>. It rounds images using custom drawable drawing.
 * Original bitmap isn't changed. <br />
 * <br />
 * If this implementation doesn't meet your needs then consider <a
 * href="https://github.com/vinc3m1/RoundedImageView">this project</a> for
 * usage.
 * 
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.9.1
 */
public class RoundedVignetteBitmapDisplayer extends RoundedBitmapDisplayer {

	public RoundedVignetteBitmapDisplayer(int cornerRadiusPixels,
			int marginPixels) {
		super(cornerRadiusPixels, marginPixels);
	}

	@Override
	public void display(Bitmap bitmap, ImageAware imageAware,
			LoadedFrom loadedFrom) {
		if (!(imageAware instanceof ImageViewAware)) {
			throw new IllegalArgumentException(
					"ImageAware should wrap ImageView. ImageViewAware is expected.");
		}

		imageAware.setImageDrawable(new RoundedVignetteDrawable(bitmap,
				cornerRadius, margin));
	}

	protected static class RoundedVignetteDrawable extends RoundedDrawable {

		RoundedVignetteDrawable(Bitmap bitmap, int cornerRadius, int margin) {
			super(bitmap, cornerRadius, margin);
		}

		@Override
		protected void onBoundsChange(Rect bounds) {
			super.onBoundsChange(bounds);
			RadialGradient vignette = new RadialGradient(mRect.centerX(),
					mRect.centerY() * 1.0f / 0.7f, mRect.centerX() * 1.3f,
					new int[] { 0, 0, 0x7f000000 }, new float[] { 0.0f, 0.7f,
							1.0f }, Shader.TileMode.CLAMP);

			Matrix oval = new Matrix();
			oval.setScale(1.0f, 0.7f);
			vignette.setLocalMatrix(oval);

			paint.setShader(new ComposeShader(bitmapShader, vignette,
					PorterDuff.Mode.SRC_OVER));
		}
	}
}