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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 
     18 package android.filterpacks.imageproc;
     19 
     20 import android.filterfw.core.Filter;
     21 import android.filterfw.core.FilterContext;
     22 import android.filterfw.core.Frame;
     23 import android.filterfw.core.FrameFormat;
     24 import android.filterfw.core.Program;
     25 import android.filterfw.format.ImageFormat;
     26 
     27 import java.lang.reflect.Field;
     28 
     29 /**
     30  * @hide
     31  */
     32 public abstract class ImageCombineFilter extends Filter {
     33 
     34     protected Program mProgram;
     35     protected String[] mInputNames;
     36     protected String mOutputName;
     37     protected String mParameterName;
     38     protected int mCurrentTarget = FrameFormat.TARGET_UNSPECIFIED;
     39 
     40     public ImageCombineFilter(String name,
     41                               String[] inputNames,
     42                               String outputName,
     43                               String parameterName) {
     44         super(name);
     45         mInputNames = inputNames;
     46         mOutputName = outputName;
     47         mParameterName = parameterName;
     48     }
     49 
     50     @Override
     51     public void setupPorts() {
     52         if (mParameterName != null) {
     53             try {
     54                 Field programField = ImageCombineFilter.class.getDeclaredField("mProgram");
     55                 addProgramPort(mParameterName, mParameterName, programField, float.class, false);
     56             } catch (NoSuchFieldException e) {
     57                 throw new RuntimeException("Internal Error: mProgram field not found!");
     58             }
     59         }
     60         for (String inputName : mInputNames) {
     61             addMaskedInputPort(inputName, ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     62         }
     63         addOutputBasedOnInput(mOutputName, mInputNames[0]);
     64     }
     65 
     66     @Override
     67     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     68         return inputFormat;
     69     }
     70 
     71     private void assertAllInputTargetsMatch() {
     72         int target = getInputFormat(mInputNames[0]).getTarget();
     73         for (String inputName : mInputNames) {
     74             if (target != getInputFormat(inputName).getTarget()) {
     75                 throw new RuntimeException("Type mismatch of input formats in filter " + this
     76                     + ". All input frames must have the same target!");
     77             }
     78         }
     79     }
     80 
     81     @Override
     82     public void process(FilterContext context) {
     83         // Pull input frames
     84         int i = 0;
     85         Frame[] inputs = new Frame[mInputNames.length];
     86         for (String inputName : mInputNames) {
     87             inputs[i++] = pullInput(inputName);
     88         }
     89 
     90         // Create output frame
     91         Frame output = context.getFrameManager().newFrame(inputs[0].getFormat());
     92 
     93         // Make sure we have a program
     94         updateProgramWithTarget(inputs[0].getFormat().getTarget(), context);
     95 
     96         // Process
     97         mProgram.process(inputs, output);
     98 
     99         // Push output
    100         pushOutput(mOutputName, output);
    101 
    102         // Release pushed frame
    103         output.release();
    104     }
    105 
    106     protected void updateProgramWithTarget(int target, FilterContext context) {
    107         if (target != mCurrentTarget) {
    108             switch (target) {
    109                 case FrameFormat.TARGET_NATIVE:
    110                     mProgram = getNativeProgram(context);
    111                     break;
    112 
    113                 case FrameFormat.TARGET_GPU:
    114                     mProgram = getShaderProgram(context);
    115                     break;
    116 
    117                 default:
    118                     mProgram = null;
    119                     break;
    120             }
    121             if (mProgram == null) {
    122                 throw new RuntimeException("Could not create a program for image filter "
    123                     + this + "!");
    124             }
    125             initProgramInputs(mProgram, context);
    126             mCurrentTarget = target;
    127         }
    128     }
    129 
    130     protected abstract Program getNativeProgram(FilterContext context);
    131 
    132     protected abstract Program getShaderProgram(FilterContext context);
    133 }
    134