Android Open Source - Android-Universal-Image-Loader Rounded Bitmap Displayer

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The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011-2014 Sergey Tarasevich
 *//www  .ja  va 2 s.c  o  m
 * 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.nostra13.universalimageloader.core.display;

import android.graphics.*;
import android.graphics.drawable.Drawable;

import com.nostra13.universalimageloader.core.assist.LoadedFrom;
import com.nostra13.universalimageloader.core.imageaware.ImageAware;
import com.nostra13.universalimageloader.core.imageaware.ImageViewAware;

/**
 * Can display bitmap with rounded corners. 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">RoundedImageView</a> or
 * <a href="https://github.com/Pkmmte/CircularImageView">CircularImageView</a> projects for usage.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.5.6
 */
public class RoundedBitmapDisplayer implements BitmapDisplayer {

  protected final int cornerRadius;
  protected final int margin;

  public RoundedBitmapDisplayer(int cornerRadiusPixels) {
    this(cornerRadiusPixels, 0);
  }

  public RoundedBitmapDisplayer(int cornerRadiusPixels, int marginPixels) {
    this.cornerRadius = cornerRadiusPixels;
    this.margin = 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 RoundedDrawable(bitmap, cornerRadius, margin));
  }

  public static class RoundedDrawable extends Drawable {

    protected final float cornerRadius;
    protected final int margin;

    protected final RectF mRect = new RectF(),
        mBitmapRect;
    protected final BitmapShader bitmapShader;
    protected final Paint paint;

    public RoundedDrawable(Bitmap bitmap, int cornerRadius, int margin) {
      this.cornerRadius = cornerRadius;
      this.margin = margin;

      bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
      mBitmapRect = new RectF (margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin);
      
      paint = new Paint();
      paint.setAntiAlias(true);
      paint.setShader(bitmapShader);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
      super.onBoundsChange(bounds);
      mRect.set(margin, margin, bounds.width() - margin, bounds.height() - margin);
      
      // Resize the original bitmap to fit the new bound
      Matrix shaderMatrix = new Matrix();
      shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
      bitmapShader.setLocalMatrix(shaderMatrix);
      
    }

    @Override
    public void draw(Canvas canvas) {
      canvas.drawRoundRect(mRect, cornerRadius, cornerRadius, paint);
    }

    @Override
    public int getOpacity() {
      return PixelFormat.TRANSLUCENT;
    }

    @Override
    public void setAlpha(int alpha) {
      paint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
      paint.setColorFilter(cf);
    }
  }
}

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