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      1 /*
      2  * Copyright 2009, The Android Open Source Project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 package com.android.sampleplugin;
     26 
     27 import android.content.Context;
     28 import android.graphics.PixelFormat;
     29 import android.view.SurfaceHolder;
     30 import android.view.SurfaceView;
     31 import android.view.SurfaceHolder.Callback;
     32 
     33 public class PaintSurface extends SurfaceView {
     34 
     35     static {
     36         //needed for jni calls
     37         System.loadLibrary("sampleplugin");
     38     }
     39 
     40     private final int npp;
     41 
     42     private boolean validNPP = true;
     43     private Object nppLock = new Object();
     44 
     45     public PaintSurface(Context context, int NPP, int width, int height) {
     46         super(context);
     47 
     48         this.npp = NPP;
     49 
     50         this.getHolder().setFormat(PixelFormat.RGBA_8888);
     51         this.getHolder().addCallback(new Callback() {
     52 
     53             public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
     54                 synchronized (nppLock) {
     55                     if (validNPP) {
     56                         nativeSurfaceChanged(npp, format, width, height);
     57                     }
     58                 }
     59             }
     60 
     61             public void surfaceCreated(SurfaceHolder holder) {
     62                 synchronized (nppLock) {
     63                     if (validNPP) {
     64                         nativeSurfaceCreated(npp);
     65                     }
     66                 }
     67             }
     68 
     69             public void surfaceDestroyed(SurfaceHolder holder) {
     70                 synchronized (nppLock) {
     71                     if (validNPP) {
     72                         nativeSurfaceDestroyed(npp);
     73                     }
     74                 }
     75             }
     76         });
     77 
     78         // sets the plugin's surface to a fixed size
     79         this.getHolder().setFixedSize(width, height);
     80 
     81         // ensure that the view system is aware that we will be drawing
     82         this.setWillNotDraw(false);
     83     }
     84 
     85     // called by JNI
     86     private void invalidateNPP() {
     87         synchronized (nppLock) {
     88             validNPP = false;
     89         }
     90     }
     91 
     92     private native void nativeSurfaceCreated(int npp);
     93     private native void nativeSurfaceChanged(int npp, int format, int width, int height);
     94     private native void nativeSurfaceDestroyed(int npp);
     95 }
     96