Let's continue our application by decoding and filtering images on the native side by the color channel:
Create native C source,
jni/CameraDecoder.c(not a C++ file, so that we can see the difference with JNI code written in C++).Include
android/bitmap.h, which defines the NDK bitmap processing API andstdlib.h(notcstdlibas this file is written in C):#include <android/bitmap.h> #include <stdlib.h> ...
Write a few utility macros to help decode a video.
toInt()converts a jbyte to an integer, erasing all useless bits with a maskmax()gets the maximum between two valuesclamp()clamps a value inside a defined intervalcolor()builds an ARGB color from each color component... #define toInt(pValue) \ (0xff & (int32_t) pValue) #define max(pValue1, pValue2) \ (pValue1 < pValue2) ? pValue2 : pValue1 #define clamp(pValue, pLowest, pHighest) \ ((pValue < 0) ? pLowest : (pValue > pHighest) ? pHighest :...