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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.Paint;
     22 import android.graphics.Path;
     23 import android.graphics.RectF;
     24 
     25 public class ImageFilterParametricBorder extends ImageFilter {
     26     private FilterColorBorderRepresentation mParameters = null;
     27 
     28     public ImageFilterParametricBorder() {
     29         mName = "Border";
     30     }
     31 
     32     public void useRepresentation(FilterRepresentation representation) {
     33         FilterColorBorderRepresentation parameters = (FilterColorBorderRepresentation) representation;
     34         mParameters = parameters;
     35     }
     36 
     37     public FilterColorBorderRepresentation getParameters() {
     38         return mParameters;
     39     }
     40 
     41     private void applyHelper(Canvas canvas, int w, int h) {
     42         if (getParameters() == null) {
     43             return;
     44         }
     45         Path border = new Path();
     46         border.moveTo(0, 0);
     47         float bs = getParameters().getBorderSize() / 100.0f * w;
     48         float r = getParameters().getBorderRadius() / 100.0f * w;
     49         border.lineTo(0, h);
     50         border.lineTo(w, h);
     51         border.lineTo(w, 0);
     52         border.lineTo(0, 0);
     53         border.addRoundRect(new RectF(bs, bs, w - bs, h - bs),
     54                 r, r, Path.Direction.CW);
     55 
     56         Paint paint = new Paint();
     57         paint.setAntiAlias(true);
     58         paint.setColor(getParameters().getColor());
     59         canvas.drawPath(border, paint);
     60     }
     61 
     62     @Override
     63     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
     64        Canvas canvas = new Canvas(bitmap);
     65        applyHelper(canvas, bitmap.getWidth(), bitmap.getHeight());
     66        return bitmap;
     67     }
     68 
     69 }
     70