編輯:關於Android編程
昨天看了下RenderScript的官方文檔,發現RenderScript這厮有點牛逼。無意中發現ScriptIntrinsic這個抽象類,有些很有用的子類。其中有個子類叫ScriptIntrinsicBlur類,大致就是將圖片實現高斯模糊。
ScriptIntrinsic的申明:
ScriptIntrinsicBlur類的申明:
加上結合著看了下SDK中的samples,自己寫了個高斯模糊。
( sample的具體位置為:
SDK目錄/samples/android-19/renderscript/RenderScriptIntrinsic/RenderScriptIntrinsicSample/
)。
先上圖。效果如下:
【注意!! 開始之前,我們需要導入需要的支持包。
支持包的具體路徑為: sdk目錄/buildtools/任意一個版本號/renderscript/lib/renderscript-v8.jar
另外:為了防止出現有的機型兼容問題,最好將renderscript-v8.jar同目錄下的packaged目錄下的所有庫也一並拷貝到lib文件夾下】
例如:
好了。開始寫代碼。。
1、先申明常用成員變量。
private SeekBar blurSeekBar;//拖動條 private ImageView img_blur;//顯示模糊後bitmap的ImageView //原bitmap和高斯模糊後的bitmap private Bitmap bitmap_original, bitmap_blur; //高斯模糊處理的AsyncTask private RenderScriptTask mLatestTask = null; //RenderScript 對象(Google的高性能並行計算類,他可以利用設備的GPU/CPU等計算資源) private RenderScript mRS; //下面是兩個RenderScript的傳入參數對象 private Allocation mInAllocation; private Allocation mOutAllocation; //高斯模糊處理實例 private ScriptIntrinsicBlur mScriptBlur;
2、加載兩份bitmap,並初始化高斯模糊相關的對象。
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); blurSeekBar = (SeekBar) findViewById(R.id.aty_main_seekBar); img_blur = (ImageView) findViewById(R.id.aty_main_img_blur); bitmap_original = loadBitmap(R.drawable.meet_entry_guide_3); // 復制一份 bitmap_blur = Bitmap.createBitmap(bitmap_original.getWidth(), bitmap_original.getHeight(), bitmap_original.getConfig()); createBlureScript(); setSeekBarListening();//為SeekBar設置拖拽監聽 } /** * Helper to load Bitmap from resource */ private Bitmap loadBitmap(int resource) { final BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; return BitmapFactory.decodeResource(getResources(), resource, options); } /** * 創建Script */ private void createBlureScript() { mRS = RenderScript.create(this); mInAllocation = Allocation.createFromBitmap(mRS, bitmap_original); mOutAllocation = Allocation.createFromBitmap(mRS, bitmap_blur); /* * Create intrinsics. RenderScript has built-in features such as blur, * convolve filter etc. These intrinsics are handy for specific * operations without writing RenderScript kernel. In the sample, it's * creating blur, convolve and matrix intrinsics. */ mScriptBlur = ScriptIntrinsicBlur.create(mRS, Element.U8_4(mRS)); }
3、完成高斯模糊處理代碼。
private void performFilter(Allocation inAllocation, Allocation outAllocation, Bitmap bitmapOut, float value) { /* * 設置模糊程度。范圍在0~25之間。否則會出錯 */ mScriptBlur.setRadius(value); /* * Invoke filter kernel */ mScriptBlur.setInput(inAllocation); mScriptBlur.forEach(outAllocation); outAllocation.copyTo(bitmapOut); }
4、將處理後的bitmap設置到ImageView中。
// Request UI update img_blur.setImageBitmap(bitmap_blur); img_blur.invalidate();
基本工作也就完成了。剩下就是代碼的相互調用了。
【 總 結 】
其實總起來,使用RenderScript進行高斯模糊主要是分為三步:
1、創建並初始化需要的對象(初始化一次就OK)。
mRS = RenderScript.create(this); mScriptBlur = ScriptIntrinsicBlur.create(mRS, Element.U8_4(mRS)); //RenderScript的輸入和輸出參數對象 mInAllocation = Allocation.createFromBitmap(mRS, bitmap_original); mOutAllocation = Allocation.createFromBitmap(mRS, bitmap_blur);
2、執行高斯模糊,並將結果拷貝出來。
/* * 設置模糊程度。范圍在0~25之間。否則會出錯(這個也可以只設置一次) */ mScriptBlur.setRadius(value); /* * Invoke filter kernel */ mScriptBlur.setInput(inAllocation); mScriptBlur.forEach(outAllocation); //將結果拷貝出來,拷貝到bitmapOut對象中 outAllocation.copyTo(bitmapOut);
3、回收RenderScript對象
mRS.destory(); mRs = null;
文章到此結束。
按照慣例:下面是我的完整的代碼實現。
public class MainActivity extends Activity { private SeekBar blurSeekBar; private ImageView img_blur; private Bitmap bitmap_original, bitmap_blur; private RenderScriptTask mLatestTask = null; private RenderScript mRS; private Allocation mInAllocation; private Allocation mOutAllocation; private ScriptIntrinsicBlur mScriptBlur; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); blurSeekBar = (SeekBar) findViewById(R.id.aty_main_seekBar); img_blur = (ImageView) findViewById(R.id.aty_main_img_blur); bitmap_original = loadBitmap(R.drawable.meet_entry_guide_3); // 復制一份 bitmap_blur = Bitmap.createBitmap(bitmap_original.getWidth(), bitmap_original.getHeight(), bitmap_original.getConfig()); createBlureScript(); setSeekBarListening(); } /** * 設置SeekBar的監聽 */ private void setSeekBarListening() { blurSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { updateImage(progress); } }); } /** * 創建Script */ private void createBlureScript() { mRS = RenderScript.create(this); mInAllocation = Allocation.createFromBitmap(mRS, bitmap_original); mOutAllocation = Allocation.createFromBitmap(mRS, bitmap_blur); /* * Create intrinsics. RenderScript has built-in features such as blur, * convolve filter etc. These intrinsics are handy for specific * operations without writing RenderScript kernel. In the sample, it's * creating blur, convolve and matrix intrinsics. */ mScriptBlur = ScriptIntrinsicBlur.create(mRS, Element.U8_4(mRS)); } private void performFilter(Allocation inAllocation, Allocation outAllocation, Bitmap bitmapOut, float value) { /* * Set blur kernel size */ mScriptBlur.setRadius(value); /* * Invoke filter kernel */ mScriptBlur.setInput(inAllocation); mScriptBlur.forEach(outAllocation); outAllocation.copyTo(bitmapOut); } /* * In the AsyncTask, it invokes RenderScript intrinsics to do a filtering. * After the filtering is done, an operation blocks at Allication.copyTo() * in AsyncTask thread. Once all operation is finished at onPostExecute() in * UI thread, it can invalidate and update ImageView UI. */ private class RenderScriptTask extends AsyncTask<Float, Integer, Integer> { Boolean issued = false; protected Integer doInBackground(Float... values) { if (isCancelled() == false) { issued = true; performFilter(mInAllocation, mOutAllocation, bitmap_blur, values[0]); } return 0; } void updateView(Integer result) { // Request UI update img_blur.setImageBitmap(bitmap_blur); img_blur.invalidate(); } protected void onPostExecute(Integer result) { updateView(result); } protected void onCancelled(Integer result) { if (issued) { updateView(result); } } } /* * Invoke AsynchTask and cancel previous task. When AsyncTasks are piled up * (typically in slow device with heavy kernel), Only the latest (and * already started) task invokes RenderScript operation. */ private void updateImage(int progress) { float f = getBlureParam(progress); if (mLatestTask != null) mLatestTask.cancel(false); mLatestTask = new RenderScriptTask(); mLatestTask.execute(f); } /** * 模糊的值在1 ~ 25之間 * * @param progress * SeekBar的進度值(0 ~ 100) * @return 模糊值 */ private float getBlureParam(int progress) { final float max = 25.0f; final float min = 1.f; return (float) ((max - min) * (progress / 100.0) + min); } /** * Helper to load Bitmap from resource */ private Bitmap loadBitmap(int resource) { final BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; return BitmapFactory.decodeResource(getResources(), resource, options); } }
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