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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 androidx.media.filterpacks.transform;
     18 
     19 import androidx.media.filterfw.Filter;
     20 import androidx.media.filterfw.FrameImage2D;
     21 import androidx.media.filterfw.FrameType;
     22 import androidx.media.filterfw.ImageShader;
     23 import androidx.media.filterfw.InputPort;
     24 import androidx.media.filterfw.MffContext;
     25 import androidx.media.filterfw.OutputPort;
     26 import androidx.media.filterfw.Signature;
     27 import androidx.media.filterfw.geometry.Quad;
     28 
     29 public class RotateFilter extends Filter {
     30 
     31     private Quad mSourceRect = Quad.fromRect(0f, 0f, 1f, 1f);
     32     private float mRotateAngle = 0;
     33     private ImageShader mShader;
     34 
     35     public RotateFilter(MffContext context, String name) {
     36         super(context, name);
     37     }
     38 
     39     @Override
     40     public Signature getSignature() {
     41         FrameType imageIn = FrameType.image2D(FrameType.ELEMENT_RGBA8888, FrameType.READ_GPU);
     42         FrameType imageOut = FrameType.image2D(FrameType.ELEMENT_RGBA8888, FrameType.WRITE_GPU);
     43         return new Signature()
     44             .addInputPort("image", Signature.PORT_REQUIRED, imageIn)
     45             .addInputPort("rotateAngle", Signature.PORT_REQUIRED, FrameType.single(float.class))
     46             .addInputPort("sourceRect", Signature.PORT_OPTIONAL, FrameType.single(Quad.class))
     47             .addOutputPort("image", Signature.PORT_REQUIRED, imageOut)
     48             .disallowOtherPorts();
     49     }
     50 
     51     @Override
     52     public void onInputPortOpen(InputPort port) {
     53         if (port.getName().equals("rotateAngle")) {
     54             port.bindToFieldNamed("mRotateAngle");
     55             port.setAutoPullEnabled(true);
     56         } else if (port.getName().equals("sourceRect")) {
     57             port.bindToFieldNamed("mSourceRect");
     58             port.setAutoPullEnabled(true);
     59         }
     60     }
     61 
     62     @Override
     63     protected void onPrepare() {
     64         mShader = ImageShader.createIdentity();
     65     }
     66 
     67     @Override
     68     protected void onProcess() {
     69         OutputPort outPort = getConnectedOutputPort("image");
     70         FrameImage2D inputImage = getConnectedInputPort("image").pullFrame().asFrameImage2D();
     71         int[] inDims = inputImage.getDimensions();
     72 
     73         FrameImage2D outputImage = outPort.fetchAvailableFrame(inDims).asFrameImage2D();
     74         mShader.setSourceQuad(mSourceRect);
     75         Quad targetQuad = mSourceRect.rotated((float) (mRotateAngle / 180 * Math.PI));
     76         mShader.setTargetQuad(targetQuad);
     77         mShader.process(inputImage, outputImage);
     78         outPort.pushFrame(outputImage);
     79     }
     80 }
     81