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Android NDK Beginner`s Guide - Second Edition
book

Android NDK Beginner`s Guide - Second Edition

by Sylvain Ratabouil
April 2015
Beginner to intermediate content levelBeginner to intermediate
494 pages
10h 26m
English
Packt Publishing
Content preview from Android NDK Beginner`s Guide - Second Edition

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 ...
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Publisher Resources

ISBN: 9781783989645Supplemental Content