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HdrViewfinder / src / com.example.android.hdrviewfinder /

ViewfinderProcessor.java

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.hdrviewfinder;
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import android.graphics.ImageFormat;
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import android.os.Handler;
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import android.os.HandlerThread;
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import android.renderscript.Allocation;
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import android.renderscript.Element;
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import android.renderscript.RenderScript;
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import android.renderscript.Type;
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import android.util.Size;
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import android.view.Surface;
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/**
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 * Renderscript-based merger for an HDR viewfinder
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 */
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public class ViewfinderProcessor {
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    private Allocation mInputHdrAllocation;
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    private Allocation mInputNormalAllocation;
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    private Allocation mPrevAllocation;
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    private Allocation mOutputAllocation;
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    private Surface mOutputSurface;
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    private HandlerThread mProcessingThread;
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    private Handler mProcessingHandler;
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    private ScriptC_hdr_merge mHdrMergeScript;
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    public ProcessingTask mHdrTask;
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    public ProcessingTask mNormalTask;
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    private Size mSize;
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    private int mMode;
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    public final static int MODE_NORMAL = 0;
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    public final static int MODE_SIDE_BY_SIDE = 1;
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    public final static int MODE_HDR = 2;
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    public ViewfinderProcessor(RenderScript rs, Size dimensions) {
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        mSize = dimensions;
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        Type.Builder yuvTypeBuilder = new Type.Builder(rs, Element.YUV(rs));
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        yuvTypeBuilder.setX(dimensions.getWidth());
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        yuvTypeBuilder.setY(dimensions.getHeight());
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        yuvTypeBuilder.setYuvFormat(ImageFormat.YUV_420_888);
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        mInputHdrAllocation = Allocation.createTyped(rs, yuvTypeBuilder.create(),
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                Allocation.USAGE_IO_INPUT | Allocation.USAGE_SCRIPT);
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        mInputNormalAllocation = Allocation.createTyped(rs, yuvTypeBuilder.create(),
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                Allocation.USAGE_IO_INPUT | Allocation.USAGE_SCRIPT);
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        Type.Builder rgbTypeBuilder = new Type.Builder(rs, Element.RGBA_8888(rs));
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        rgbTypeBuilder.setX(dimensions.getWidth());
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        rgbTypeBuilder.setY(dimensions.getHeight());
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        mPrevAllocation = Allocation.createTyped(rs, rgbTypeBuilder.create(),
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                Allocation.USAGE_SCRIPT);
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        mOutputAllocation = Allocation.createTyped(rs, rgbTypeBuilder.create(),
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                Allocation.USAGE_IO_OUTPUT | Allocation.USAGE_SCRIPT);
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        mProcessingThread = new HandlerThread("ViewfinderProcessor");
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        mProcessingThread.start();
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        mProcessingHandler = new Handler(mProcessingThread.getLooper());
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        mHdrMergeScript = new ScriptC_hdr_merge(rs);
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        mHdrMergeScript.set_gPrevFrame(mPrevAllocation);
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        mHdrTask = new ProcessingTask(mInputHdrAllocation, dimensions.getWidth()/2, true);
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        mNormalTask = new ProcessingTask(mInputNormalAllocation, 0, false);
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        setRenderMode(MODE_NORMAL);
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    }
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    public Surface getInputHdrSurface() {
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        return mInputHdrAllocation.getSurface();
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    }
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    public Surface getInputNormalSurface() {
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        return mInputNormalAllocation.getSurface();
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    }
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    public void setOutputSurface(Surface output) {
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        mOutputAllocation.setSurface(output);
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    }
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    public void setRenderMode(int mode) {
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        mMode = mode;
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    }
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    /**
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     * Simple class to keep track of incoming frame count,
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     * and to process the newest one in the processing thread
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     */
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    class ProcessingTask implements Runnable, Allocation.OnBufferAvailableListener {
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        private int mPendingFrames = 0;
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        private int mFrameCounter = 0;
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        private int mCutPointX;
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        private boolean mCheckMerge;
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        private Allocation mInputAllocation;
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        public ProcessingTask(Allocation input, int cutPointX, boolean checkMerge) {
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            mInputAllocation = input;
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            mInputAllocation.setOnBufferAvailableListener(this);
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            mCutPointX = cutPointX;
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            mCheckMerge = checkMerge;
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        }
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        @Override
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        public void onBufferAvailable(Allocation a) {
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            synchronized(this) {
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                mPendingFrames++;
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                mProcessingHandler.post(this);
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            }
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        }
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        @Override
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        public void run() {
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            // Find out how many frames have arrived
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            int pendingFrames;
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            synchronized(this) {
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                pendingFrames = mPendingFrames;
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                mPendingFrames = 0;
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                // Discard extra messages in case processing is slower than frame rate
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                mProcessingHandler.removeCallbacks(this);
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            }
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            // Get to newest input
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            for (int i = 0; i < pendingFrames; i++) {
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                mInputAllocation.ioReceive();
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            }
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            mHdrMergeScript.set_gFrameCounter(mFrameCounter++);
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            mHdrMergeScript.set_gCurrentFrame(mInputAllocation);
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            mHdrMergeScript.set_gCutPointX(mCutPointX);
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            if (mCheckMerge && mMode == MODE_HDR) {
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                mHdrMergeScript.set_gDoMerge(1);
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            } else {
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                mHdrMergeScript.set_gDoMerge(0);
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            }
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            // Run processing pass
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            mHdrMergeScript.forEach_mergeHdrFrames(mPrevAllocation, mOutputAllocation);
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            mOutputAllocation.ioSend();
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        }
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    }
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}
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