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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.gallery3d.filtershow.filters;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.Canvas;
     21 import android.graphics.Color;
     22 import android.graphics.Paint;
     23 import android.graphics.Path;
     24 import android.graphics.RectF;
     25 
     26 public class ImageFilterColorBorder extends ImageFilter {
     27     private static final String LOGTAG = "ImageFilterColorBorder";
     28     private FilterColorBorderRepresentation mParameters = null;
     29     Paint mPaint = new Paint();
     30     RectF mBounds = new RectF();
     31     RectF mInsideBounds = new RectF();
     32     Path mBorderPath = new Path();
     33 
     34     public ImageFilterColorBorder() {
     35         mName = "Border";
     36     }
     37 
     38     public FilterRepresentation getDefaultRepresentation() {
     39         return new FilterColorBorderRepresentation(Color.WHITE, 3, 2);
     40     }
     41 
     42     public void useRepresentation(FilterRepresentation representation) {
     43         FilterColorBorderRepresentation parameters =
     44                 (FilterColorBorderRepresentation) representation;
     45         mParameters = parameters;
     46     }
     47 
     48     public FilterColorBorderRepresentation getParameters() {
     49         return mParameters;
     50     }
     51 
     52     private void applyHelper(Canvas canvas, int w, int h) {
     53         if (getParameters() == null) {
     54             return;
     55         }
     56         float size = getParameters().getBorderSize();
     57         float radius = getParameters().getBorderRadius();
     58 
     59         mPaint.reset();
     60         mPaint.setColor(getParameters().getColor());
     61         mPaint.setAntiAlias(true);
     62         mBounds.set(0, 0, w, h);
     63         mBorderPath.reset();
     64         mBorderPath.moveTo(0, 0);
     65 
     66         float bs = size / 100.f * mBounds.width();
     67         float r = radius / 100.f * mBounds.width();
     68 
     69         mInsideBounds.set(mBounds.left + bs,
     70                 mBounds.top + bs, mBounds.right - bs,
     71                 mBounds.bottom - bs);
     72 
     73         mBorderPath.moveTo(mBounds.left, mBounds.top);
     74         mBorderPath.lineTo(mBounds.right, mBounds.top);
     75         mBorderPath.lineTo(mBounds.right, mBounds.bottom);
     76         mBorderPath.lineTo(mBounds.left, mBounds.bottom);
     77         mBorderPath.addRoundRect(mInsideBounds,
     78                 r, r, Path.Direction.CCW);
     79 
     80         canvas.drawPath(mBorderPath, mPaint);
     81     }
     82 
     83     @Override
     84     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
     85         Canvas canvas = new Canvas(bitmap);
     86         applyHelper(canvas, bitmap.getWidth(), bitmap.getHeight());
     87         return bitmap;
     88     }
     89 
     90 }
     91