Add crop circle with border transformation (#136)

transformations/src/main/java/jp/wasabeef/glide/transformations/CropCircleWithBorderTransformation.java

@@ -0,0 +1,94 @@
+package jp.wasabeef.glide.transformations;
+
+/**
+ * Copyright (C) 2017 Wasabeef
+ *
+ * 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.
+ */
+
+public class CropCircleWithBorderTransformation implements Transformation<Bitmap> {
+
+    private BitmapPool mBitmapPool;
+    private int borderWidth;
+    private int borderColor;
+
+    public CropCircleWithBorderTransformation(Context context, int borderWidth,
+                                              @ColorInt int borderColor) {
+        this(Glide.get(context).getBitmapPool());
+        this.borderWidth = borderWidth;
+        this.borderColor = borderColor;
+    }
+
+    public CropCircleWithBorderTransformation(BitmapPool pool) {
+        this.mBitmapPool = pool;
+    }
+
+    @Override
+    public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
+        Bitmap source = resource.get();
+        int size = Math.min(source.getWidth(), source.getHeight());
+
+        int width = (source.getWidth() - size) / 2;
+        int height = (source.getHeight() - size) / 2;
+
+        Bitmap bitmap = mBitmapPool.get(size, size, Bitmap.Config.ARGB_8888);
+        if (bitmap == null) {
+            bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
+        }
+
+        Canvas canvas = new Canvas(bitmap);
+        Paint paint = new Paint();
+        BitmapShader shader =
+                new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
+        if (width != 0 || height != 0) {
+            // source isn't square, move viewport to center
+            Matrix matrix = new Matrix();
+            matrix.setTranslate(-width, -height);
+            shader.setLocalMatrix(matrix);
+        }
+        paint.setShader(shader);
+        paint.setAntiAlias(true);
+
+        float r = size / 2f;
+        canvas.drawCircle(r, r, r, paint);
+
+        // add border
+        int dstBitmapWidth = bitmap.getWidth() + borderWidth * 2;
+        Bitmap borderedBitmap =
+                Bitmap.createBitmap(dstBitmapWidth, dstBitmapWidth, Bitmap.Config.ARGB_8888);
+        Canvas canvas1 = new Canvas(borderedBitmap);
+        canvas1.drawBitmap(bitmap, borderWidth, borderWidth, null);
+
+        Paint paint1 = new Paint();
+        paint1.setColor(borderColor);
+        paint1.setStyle(Paint.Style.STROKE);
+        paint1.setStrokeWidth(borderWidth);
+        paint1.setAntiAlias(true);
+
+        canvas1.drawCircle(
+                canvas1.getWidth() / 2,
+                canvas1.getWidth() / 2,
+                canvas1.getWidth() / 2 - borderWidth / 2,
+                paint1
+        );
+
+        bitmap.recycle();
+
+        return BitmapResource.obtain(borderedBitmap, mBitmapPool);
+    }
+
+    @Override public String getId() {
+        return "CropCircleWithBorderTransformation(" +
+                "width=" + borderWidth + ", color=" + borderColor + ")";
+    }
+}