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      1 /*
      2  * Copyright (C) 2011 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 android.filterpacks.imageproc;
     18 
     19 import android.filterfw.core.Filter;
     20 import android.filterfw.core.FilterContext;
     21 import android.filterfw.core.Frame;
     22 import android.filterfw.core.FrameFormat;
     23 import android.filterfw.core.GenerateFieldPort;
     24 import android.filterfw.core.MutableFrameFormat;
     25 import android.filterfw.core.ShaderProgram;
     26 import android.filterfw.format.ImageFormat;
     27 import android.filterfw.geometry.Point;
     28 import android.filterfw.geometry.Quad;
     29 
     30 /**
     31  * The FixedRotationFilter rotates the input image clockwise, it only accepts
     32  * 4 rotation angles: 0, 90, 180, 270
     33  * @hide
     34  */
     35 public class FixedRotationFilter extends Filter {
     36 
     37     @GenerateFieldPort(name = "rotation", hasDefault = true)
     38     private int mRotation = 0;
     39 
     40     private ShaderProgram mProgram = null;
     41 
     42     public FixedRotationFilter(String name) {
     43         super(name);
     44     }
     45 
     46     @Override
     47     public void setupPorts() {
     48         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
     49                                                        FrameFormat.TARGET_GPU));
     50         addOutputBasedOnInput("image", "image");
     51     }
     52 
     53     @Override
     54     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     55         return inputFormat;
     56     }
     57 
     58     @Override
     59     public void process(FilterContext context) {
     60         Frame input = pullInput("image");
     61         if (mRotation == 0) {
     62             pushOutput("image", input);
     63             return;
     64         }
     65         FrameFormat inputFormat = input.getFormat();
     66 
     67         // Create program if not created already
     68         if (mProgram == null) {
     69             mProgram = ShaderProgram.createIdentity(context);
     70         }
     71         MutableFrameFormat outputFormat = inputFormat.mutableCopy();
     72         int width = inputFormat.getWidth();
     73         int height = inputFormat.getHeight();
     74         Point p1 = new Point(0.0f, 0.0f);
     75         Point p2 = new Point(1.0f, 0.0f);
     76         Point p3 = new Point(0.0f, 1.0f);
     77         Point p4 = new Point(1.0f, 1.0f);
     78         Quad sourceRegion;
     79         switch (((int)Math.round(mRotation / 90f)) % 4) {
     80             case 1:
     81                 sourceRegion = new Quad(p3,p1,p4,p2);
     82                 outputFormat.setDimensions(height, width);
     83                 break;
     84             case 2:
     85                 sourceRegion = new Quad(p4,p3,p2,p1);
     86                 break;
     87             case 3:
     88                 sourceRegion = new Quad(p2,p4,p1,p3);
     89                 outputFormat.setDimensions(height, width);
     90                 break;
     91             case 0:
     92             default:
     93                 sourceRegion = new Quad(p1,p2,p3,p4);
     94                 break;
     95         }
     96         // Create output frame
     97         Frame output = context.getFrameManager().newFrame(outputFormat);
     98 
     99         // Set the source region
    100         mProgram.setSourceRegion(sourceRegion);
    101 
    102         // Process
    103         mProgram.process(input, output);
    104 
    105         // Push output
    106         pushOutput("image", output);
    107 
    108         // Release pushed frame
    109         output.release();
    110     }
    111 }
    112