add Crop

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

@@ -0,0 +1,76 @@
+package jp.wasabeef.glide.transformations;
+
+/**
+ * Copyright (C) 2015 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.
+ */
+
+import com.bumptech.glide.load.Transformation;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import com.bumptech.glide.load.resource.bitmap.BitmapResource;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.RectF;
+
+public class CropTransformation implements Transformation<Bitmap> {
+
+    private BitmapPool mBitmapPool;
+    private int mWidth;
+    private int mHeight;
+
+    public CropTransformation(BitmapPool pool) {
+        mBitmapPool = pool;
+    }
+
+    public CropTransformation(BitmapPool pool, int width, int height) {
+        mBitmapPool = pool;
+        mWidth = width;
+        mHeight = height;
+    }
+
+    @Override
+    public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
+        Bitmap source = resource.get();
+        if (mWidth == 0) {
+            mWidth = source.getWidth();
+        }
+        if (mHeight == 0) {
+            mHeight = source.getHeight();
+        }
+
+        float scaleX = (float) mWidth / source.getWidth();
+        float scaleY = (float) mHeight / source.getHeight();
+        float scale = Math.max(scaleX, scaleY);
+
+        float scaledWidth = scale * source.getWidth();
+        float scaledHeight = scale * source.getHeight();
+        float left = (mWidth - scaledWidth) / 2;
+        float top = (mHeight - scaledHeight) / 2;
+        RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
+
+        Bitmap bitmap = Bitmap.createBitmap(mWidth, mHeight, source.getConfig());
+        Canvas canvas = new Canvas(bitmap);
+        canvas.drawBitmap(source, null, targetRect, null);
+        source.recycle();
+
+        return BitmapResource.obtain(bitmap, mBitmapPool);
+    }
+
+    @Override
+    public String getId() {
+        return "CropTransform(width=" + mWidth + ", height=" + mHeight + ")";
+    }
+}