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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 
     21 import com.android.gallery3d.filtershow.imageshow.Spline;
     22 
     23 public class ImageFilterCurves extends ImageFilter {
     24 
     25     private static final String LOGTAG = "ImageFilterCurves";
     26     FilterCurvesRepresentation mParameters = new FilterCurvesRepresentation();
     27 
     28     @Override
     29     public FilterRepresentation getDefaultRepresentation() {
     30         return new FilterCurvesRepresentation();
     31     }
     32 
     33     @Override
     34     public void useRepresentation(FilterRepresentation representation) {
     35         FilterCurvesRepresentation parameters = (FilterCurvesRepresentation) representation;
     36         mParameters = parameters;
     37     }
     38 
     39     public ImageFilterCurves() {
     40         mName = "Curves";
     41         reset();
     42     }
     43 
     44     public void populateArray(int[] array, int curveIndex) {
     45         Spline spline = mParameters.getSpline(curveIndex);
     46         if (spline == null) {
     47             return;
     48         }
     49         float[] curve = spline.getAppliedCurve();
     50         for (int i = 0; i < 256; i++) {
     51             array[i] = (int) (curve[i] * 255);
     52         }
     53     }
     54 
     55     @Override
     56     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
     57         if (!mParameters.getSpline(Spline.RGB).isOriginal()) {
     58             int[] rgbGradient = new int[256];
     59             populateArray(rgbGradient, Spline.RGB);
     60             nativeApplyGradientFilter(bitmap, bitmap.getWidth(), bitmap.getHeight(),
     61                     rgbGradient, rgbGradient, rgbGradient);
     62         }
     63 
     64         int[] redGradient = null;
     65         if (!mParameters.getSpline(Spline.RED).isOriginal()) {
     66             redGradient = new int[256];
     67             populateArray(redGradient, Spline.RED);
     68         }
     69         int[] greenGradient = null;
     70         if (!mParameters.getSpline(Spline.GREEN).isOriginal()) {
     71             greenGradient = new int[256];
     72             populateArray(greenGradient, Spline.GREEN);
     73         }
     74         int[] blueGradient = null;
     75         if (!mParameters.getSpline(Spline.BLUE).isOriginal()) {
     76             blueGradient = new int[256];
     77             populateArray(blueGradient, Spline.BLUE);
     78         }
     79 
     80         nativeApplyGradientFilter(bitmap, bitmap.getWidth(), bitmap.getHeight(),
     81                 redGradient, greenGradient, blueGradient);
     82         return bitmap;
     83     }
     84 
     85     public void setSpline(Spline spline, int splineIndex) {
     86         mParameters.setSpline(splineIndex, new Spline(spline));
     87     }
     88 
     89     public Spline getSpline(int splineIndex) {
     90         return mParameters.getSpline(splineIndex);
     91     }
     92 
     93     public void reset() {
     94         Spline spline = new Spline();
     95 
     96         spline.addPoint(0.0f, 1.0f);
     97         spline.addPoint(1.0f, 0.0f);
     98 
     99         for (int i = 0; i < 4; i++) {
    100             mParameters.setSpline(i, new Spline(spline));
    101         }
    102     }
    103 
    104     public void useFilter(ImageFilter a) {
    105         ImageFilterCurves c = (ImageFilterCurves) a;
    106         for (int i = 0; i < 4; i++) {
    107             if (c.mParameters.getSpline(i) != null) {
    108                 setSpline(c.mParameters.getSpline(i), i);
    109             }
    110         }
    111     }
    112 }
    113