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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 com.android.gallery3d.R;
     20 import com.android.gallery3d.filtershow.editors.BasicEditor;
     21 
     22 import android.graphics.Bitmap;
     23 
     24 public class ImageFilterHue extends SimpleImageFilter {
     25     private ColorSpaceMatrix cmatrix = null;
     26 
     27     public ImageFilterHue() {
     28         mName = "Hue";
     29         cmatrix = new ColorSpaceMatrix();
     30     }
     31 
     32     public FilterRepresentation getDefaultRepresentation() {
     33         FilterBasicRepresentation representation =
     34                 (FilterBasicRepresentation) super.getDefaultRepresentation();
     35         representation.setName("Hue");
     36         representation.setFilterClass(ImageFilterHue.class);
     37         representation.setMinimum(-180);
     38         representation.setMaximum(180);
     39         representation.setTextId(R.string.hue);
     40         representation.setButtonId(R.id.hueButton);
     41         representation.setEditorId(BasicEditor.ID);
     42         representation.setSupportsPartialRendering(true);
     43         return representation;
     44     }
     45 
     46     native protected void nativeApplyFilter(Bitmap bitmap, int w, int h, float []matrix);
     47 
     48     @Override
     49     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
     50         if (getParameters() == null) {
     51             return bitmap;
     52         }
     53         int w = bitmap.getWidth();
     54         int h = bitmap.getHeight();
     55         float value = getParameters().getValue();
     56         cmatrix.identity();
     57         cmatrix.setHue(value);
     58 
     59         nativeApplyFilter(bitmap, w, h, cmatrix.getMatrix());
     60 
     61         return bitmap;
     62     }
     63 }
     64