aprock · August 12, 2013 18:08 · Aug 12, 2013
diff --git a/RoundedTransformation.java b/RoundedTransformation.java
@@ -0,0 +1,43 @@
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.BitmapShader;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.graphics.Shader;
+
+// enables hardware accelerated rounded corners
+// original idea here : http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/
+public class RoundedTransformation implements com.squareup.picasso.Transformation {
+    private final int radius;
+    private final int margin;  // dp
+
+    // radius is corner radii in dp
+    // margin is the board in dp
+    public RoundedTransformation(final int radius, final int margin) {
+        this.radius = radius;
+        this.margin = margin;
+    }
+
+    @Override
+    public Bitmap transform(final Bitmap source) {
+        final Paint paint = new Paint();
+        paint.setAntiAlias(true);
+        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
+
+        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888);
+        Canvas canvas = new Canvas(output);
+        canvas.drawRoundRect(new RectF(margin, margin, source.getWidth() - margin, source.getHeight() - margin), radius, radius, paint);
+
+        if (source != output) {
+            source.recycle();
+        }
+
+        return output;
+    }
+
+    @Override
+    public String key() {
+        return "rounded";
+    }
+}