java – Renderscript支持库的问题

我试图在API 16及更高版本的设备上使用 Android Renderscript支持库,按照步骤 described here.到目前为止,事情并不顺利.

我的Renderscript代码如下所示.

#pragma version(1)
#pragma rs java_package_name(com.xxx.renderscript.test)

#include "rs_time.rsh"

rs_script flipScript;
rs_allocation gIn;
rs_allocation gOut;
int width;
int height;
int direction = 0;

void root(uchar4 *v_out,const void *usrData,uint32_t x,uint32_t y) {
    if(direction == 0) { // flip horizontally
        const uchar4 *element = rsGetElementAt(gIn,width - x,y);
        float4 color = rsUnpackColor8888(*element);
        float4 output = {color.r,color.g,color.b};
        *v_out = rsPackColorTo8888(output);
    }
    else if(direction == 1) { // flip vertically
        const uchar4 *element = rsGetElementAt(gIn,x,height - y);
        float4 color = rsUnpackColor8888(*element);
        float4 output = {color.r,color.b};
        *v_out = rsPackColorTo8888(output);
    }
    else if(direction == 2) { // rotate left
        const uchar4 *element = rsGetElementAt(gIn,width - y,x);
        float4 color = rsUnpackColor8888(*element);
        float4 output = {color.r,color.b};
        *v_out = rsPackColorTo8888(output);
    }
    else if(direction == 3) { // rotate right
        const uchar4 *element = rsGetElementAt(gIn,y,height - x);
        float4 color = rsUnpackColor8888(*element);
        float4 output = {color.r,color.b};
        *v_out = rsPackColorTo8888(output);
    }
}

void flip(int testIdx) {
    int64_t  t0,t1;
    int64_t  t;
    t0 = rsUptimeNanos();
    rsForEach(flipScript,gIn,gOut);
    t1 = rsUptimeNanos();
    t = t1 - t0;
    rsDebug("  flip: timer on RS side: ",t);
}

首先我将我的Android SDK工具升级到22.3,将我的SDK平台工具升级到19.如果我单击ADT / Help / About ADT / Installation Details,我看到所有组件都已升级到22.3.0,除了Developer Tools,仍然是21.0.1：

Android DDMS  22.3.0.v201310242005-887826 com.android.ide.eclipse.ddms.feature.group  The Android Open Source Project
  Android Developer Tools   21.0.1.201212060302 com.android.ide.eclipse.adt.package.product null
  Android Development Tools 22.3.0.v201310242005-887826 com.android.ide.eclipse.adt.feature.group   The Android Open Source Project
  Android Hierarchy Viewer  22.3.0.v201310242005-887826 com.android.ide.eclipse.hierarchyviewer.feature.group   The Android Open Source Project
  Android Native Development Tools  22.3.0.v201310242005-887826 com.android.ide.eclipse.ndk.feature.group   The Android Open Source Project
  Android Traceview 22.3.0.v201310242005-887826 com.android.ide.eclipse.traceview.feature.group The Android Open Source Project
  Tracer for OpenGL ES  22.3.0.v201310242005-887826 com.android.ide.eclipse.gldebugger.feature.group    The Android Open Source Project

然后我按照上述步骤中的建议编辑了我的“project.properties”文件.我也做了修改,加入了Tim Murray的评论.

proguard.config=C:/android/adt-bundle-windows-x86_64/sdk/tools/proguard/proguard-android.txt:proguard-project.txt

# Project target.
target=android-18
renderscript.target=18
renderscript.support.mode=true
#sdk.buildtools=19.0.0

在我的Java代码中,我确保导入了支持库中的包.下面列出的是完整的Java文件：

package com.xxx.renderscript.test;

import android.support.v8.renderscript.*;
//import android.renderscript.RenderScript;
//import android.renderscript.Allocation;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;

public class RenderScriptTestActivity extends Activity {

    private final String mLog = this.getClass().getName();
    private static final int TESTS_PER_GROUP = 12;

    private Bitmap mBitmapIn;
    private Bitmap mBitmapOut;
    private ImageView mDisplayView;

    private RenderScript mRS = null;
    private ScriptC_flip mScriptFlip = null;
    private Allocation mInPixelsAllocation = null;
    private Allocation mOutPixelsAllocation = null;

    //use aSyncTask so we display the image while rendering it.
    private ImageRenderTask mImageRenderTask = null;
    private boolean isRsBenchDone = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.i(mLog,"onCreate() ");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_rs);

        mBitmapIn = loadBitmap(R.drawable.city);
        mBitmapOut = loadBitmap(R.drawable.city);

        mDisplayView = (ImageView) findViewById(R.id.rs_display);
        mDisplayView.setImageBitmap(mBitmapOut);

        // RS instances
        mRS = RenderScript.create(this);
        mScriptFlip = new ScriptC_flip(mRS,getResources(),R.raw.flip);

        mInPixelsAllocation = Allocation.createFromBitmap(mRS,mBitmapIn,Allocation.MipmapControl.MIPMAP_NONE,Allocation.USAGE_SCRIPT);
        mOutPixelsAllocation = Allocation.createFromBitmap(mRS,mBitmapOut,Allocation.USAGE_SCRIPT);
    }

    @Override
    protected void onResume() {
        Log.i(mLog,"onResume ");
        super.onResume();

        // for thread & display control
        isRsBenchDone = true;
    }

    // initialize flip.rs
    private void setupRS() {
        Log.i(mLog,"Initializing flip.rs...");
        mScriptFlip.set_flipScript(mScriptFlip);
        mScriptFlip.set_width(mBitmapIn.getWidth());
        mScriptFlip.set_height(mBitmapIn.getHeight());
        mScriptFlip.set_gIn(mInPixelsAllocation);
        mScriptFlip.set_gOut(mOutPixelsAllocation);
    }

    @Override
    protected void onStop() {
        Log.i(mLog,"onStop ");
        super.onStop();
    }

    private void resetRS() {
        mBitmapIn  = null;
        mBitmapOut = null;
        mRS = null;
        mScriptFlip   = null;
        mInPixelsAllocation    = null;
        mOutPixelsAllocation   = null;
    }

    private Bitmap loadBitmap(int resource) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap b_temp = BitmapFactory.decodeResource(getResources(),resource,options);
        int w = b_temp.getWidth();
        int h = b_temp.getHeight();
        Config cfg = b_temp.getConfig();
        Bitmap b_keep = Bitmap.createBitmap(w,h,cfg);
        Canvas c = new Canvas(b_keep);
        c.drawBitmap(b_temp,null);
        b_temp.recycle();

        if (true) {
            Log.d(mLog,"loadBitmap(): width = " + w + "  loadBitmap(): height = " + h);
        }
        return b_keep;
    }

    // press the button to invoke this function
    public void benchmark(View v) {
        if (false == isRsBenchDone) {  //do nothing if it's not done yet
            return;
        }
        if (mImageRenderTask != null) {
            if (mImageRenderTask.getStatus() == AsyncTask.Status.RUNNING) {
                return;
            }
            if (mImageRenderTask.getStatus() == AsyncTask.Status.PENDING) {
                mImageRenderTask.execute();
                return;
            }
        }
        // instantiate AsyncTask if not already existed & running
        Log.i(mLog,"User pressed Start");
        SystemClock.sleep(2000);
        isRsBenchDone = false;
        setupRS();
        mImageRenderTask = new ImageRenderTask();
        mImageRenderTask.execute();
    }

    // user presses this button when the test is done and all results have been
    // recorded.
    public void pressedRsExit(View view) {
        Log.i(mLog,"User pressed Exit");
        if (isRsBenchDone) {  // only exit when we are finished
            resetRS();
            RenderScriptTestActivity.this.finish();
        }
    }


    /**************************************************************************
     **
     *   Since the display must be updated in the main UI thread,and the main
     *   UI thread cannot be put to sleep,we have to use an AsyncTask to update
     *   the display after the image is rendered,and then sleep some time
     *   so that the tester can view the images being displayed.
     **
     **************************************************************************/
    private class ImageRenderTask extends AsyncTask<Void,Drawable,Void> {

        // runs in the UI (main) thread in correspondence to the AsyncTask
        // updating the drawable.
        protected void onProgressUpdate(Drawable... values) {
            Log.i(mLog,"onProgressUpdate...");
            super.onProgressUpdate(values);
            Drawable draw_tmp = values[0];
            mDisplayView.setImageDrawable(draw_tmp);
            mDisplayView.invalidate();
        }

        // runs on the UI (main) thread after the AsyncTask is finished
        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);

            // reset the flag to exit
            isRsBenchDone = true;
        }

        @Override
        protected Void doInBackground(Void... params) {
            int group_id;
            int flip_way;

            //------------------------------------------------------------
            //                    group 4: flip horizontally
            //------------------------------------------------------------
            flip_way = 0;
            mScriptFlip.set_direction(flip_way);
            Log.i(mLog,"starting horizontal flipping ... ... ... ...");

            // measure group 4
            group_id = 4;  // used as a switch for render script
            measureRS(group_id);
            Log.i(mLog,"    horizontal done");

            // sleep cannot happen in the main UI thread
            SystemClock.sleep(2500);
            updateDisplay();
            SystemClock.sleep(2500);

            //------------------------------------------------------------
            //                    group 5: flip vertically
            //------------------------------------------------------------
            mScriptFlip.set_gIn(mInPixelsAllocation);
            flip_way = 1;
            mScriptFlip.set_direction(flip_way);
            Log.i(mLog,"starting vertical flipping ... ... ... ...");

            // measure group 5
            group_id = 5;  // used as a switch for render script
            measureRS(group_id);
            Log.i(mLog,"    vertical done");

            // sleep cannot happen in the main UI thread
            SystemClock.sleep(2500);
            updateDisplay();
            SystemClock.sleep(2500);

            return null;
        }

        // run and measure Render Script instances
        private void measureRS(int group_id) {
            if ((0==group_id) || (1 == group_id) || (2 == group_id)) {
                //other stuff
            }
            if (3 == group_id) {
                //other stuff
            }
            if ((4==group_id) || (5 == group_id)) {
                for (int i = 0; i < TESTS_PER_GROUP; i++) {
                    mScriptFlip.invoke_flip(i);
                }
            }
        }

        // update the displayed image
        private void updateDisplay() {
            Log.i(mLog,"updateDisplay...");
            //mOutPixelsAllocation.copyTo(mBitmapIn);  // this to verify the display.
            mOutPixelsAllocation.copyTo(mBitmapOut);
            Bitmap b_temp = Bitmap.createBitmap(mBitmapOut.getWidth(),mBitmapOut.getHeight(),Bitmap.Config.ARGB_8888);
            Canvas c_temp = new Canvas(b_temp);
            c_temp.drawBitmap(mBitmapOut,null);
            Drawable d_temp = new BitmapDrawable(getResources(),b_temp);
            publishProgress(d_temp);
        }
    }
}

最后,在我的项目属性中,我将外部JAR添加到Java Build Path中：

renderscript-v8.jar - C:androidadt-bundle-windows-x86_64sdkbuild-tools19.0.0renderscriptlib

代码构建没有任何问题.然后我在几台设备上测试了它.以下是测试结果.

Nexus 7(2012版,升级到Android 4.4)
代码运行完成而没有崩溃.但是,在第一次调用Renderscript之后,更新ImageView会导致显示空白.显然输出位图没有正确写入.

（编辑：安卓应用网）

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