Circle cropping for images.

Author: Qualtagh

library/src/main/java/com/nostra13/universalimageloader/core/display/CircleBitmapDisplayer.java

@@ -0,0 +1,132 @@
+/*******************************************************************************
+ * Copyright 2011-2014 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.nostra13.universalimageloader.core.display;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapShader;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Shader;
+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 cropped by a circle. 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.
+ */
+public class CircleBitmapDisplayer implements BitmapDisplayer {
+
+	protected final Integer strokeColor;
+
+	public CircleBitmapDisplayer() {
+		this(null);
+	}
+
+	public CircleBitmapDisplayer(Integer strokeColor) {
+		this.strokeColor = strokeColor;
+	}
+
+	@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, strokeColor));
+	}
+
+	public static class RoundedDrawable extends Drawable {
+
+		protected float radius;
+
+		protected final RectF mRect = new RectF(),
+				mBitmapRect;
+		protected final BitmapShader bitmapShader;
+		protected final Paint paint;
+		protected final Paint strokePaint;
+
+		public RoundedDrawable(Bitmap bitmap, Integer strokeColor) {
+			radius = Math.min(bitmap.getWidth(), bitmap.getHeight()) / 2;
+
+			bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
+			mBitmapRect = new RectF (0, 0, bitmap.getWidth(), bitmap.getHeight());
+			
+			paint = new Paint();
+			paint.setAntiAlias(true);
+			paint.setShader(bitmapShader);
+			paint.setFilterBitmap(true);
+			paint.setDither(true);
+			if (strokeColor == null) strokePaint = null;
+			else {
+				strokePaint = new Paint();
+				strokePaint.setStyle(Paint.Style.STROKE);
+				strokePaint.setColor(strokeColor);
+				strokePaint.setStrokeWidth(0.0F);
+				strokePaint.setAntiAlias(true);
+			}
+		}
+
+		@Override
+		protected void onBoundsChange(Rect bounds) {
+			super.onBoundsChange(bounds);
+			mRect.set(0, 0, bounds.width(), bounds.height());
+			radius = Math.min(bounds.width(), bounds.height()) / 2;
+			
+			// 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.drawCircle(radius, radius, radius, paint);
+			if (strokePaint != null) canvas.drawCircle(radius, radius, radius, strokePaint);
+		}
+
+		@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);
+		}
+	}
+}