Time for action – running RenderScript Blur intrinsic

Let's create the native module that will generate our new effect.

1. Create a new file jni/ RenderScript.cpp. We will need the following:
   • android/bitmap.h header to manipulate bitmaps.
   • jni.h for JNI strings.
   • RenderScript.h, which is the main RenderScript header file. This is the only one you should need. RenderScript is written in C++ and is defined in the android::RSC namespace.

     #include <android/bitmap.h>
     #include <jni.h>
     #include <RenderScript.h>
     
     using namespace android::RSC;
     ...

2. Write two utility methods to lock and unlock Android bitmaps as seen in Chapter 4, Calling Java Back from Native Code:

   ...
   void lockBitmap(JNIEnv* pEnv, jobject pImage,
           AndroidBitmapInfo* pInfo, uint32_t** pContent) {
       if (AndroidBitmap_getInfo(pEnv, pImage, pInfo) < 0) abort();
       if (pInfo->format != ANDROID_BITMAP_FORMAT_RGBA_8888) abort();
       if (AndroidBitmap_lockPixels(pEnv, pImage,
               (void**)pContent...