Android Render Script Error when assigning to Out paramaeter

Question

i am getting error

Fatal signal 11 (SIGSEGV) at 0x51b71000 (code=1), thread 3696 (sssist.magnitab)

Whenever i assign value to out parameter for send back the values main app , when i remove assignment error goes away , here is my code ,(below part the android code )

 void root(const char *in, int *out, uint32_t x, uint32_t y) {\
    int  pixelData[size];
    for (int i = 0; i <size ; i += 16)
        {
            //rsDebug("---------------:","3333");



            int lumOne = in[i];
            lumOne += 128;
            pixelData[lumOne]=pixelData[lumOne]+1;

            int lumTwo = in[i+2];
            lumTwo += 128;
            //pixelData[lumTwo]++;
            pixelData[lumTwo]=pixelData[lumTwo]+1;

        }

        out[10]=23;


}
RenderScript mRS;

       mRS = RenderScript.create(activity);
       ScriptC_mono mScript;
       // Convert to Bitmap

       Allocation alloc = Allocation.createSized(mRS, Element.I8(mRS), array.length, Allocation.USAGE_SCRIPT);
       alloc.copyFrom(array);
       int[] ret = new int[array.length];
       int[] ret2 = new int[array.length];
       Allocation alloc_out =    Allocation.createSized(mRS, Element.I32(mRS), array.length, Allocation.USAGE_SCRIPT);
       alloc_out.copyFrom(ret2);

       mScript = new ScriptC_mono(mRS, activity.getResources(),R.raw.mono);
       mScript.set_size(array.length);
       mScript.forEach_root(alloc, alloc_out);
       alloc_out.copyTo(ret2);

       //byte [] outarray = array;
       // mOutPixelsAllocation.copyTo(outarray);
        mRS.finish();

help me to correct this.

Answer 1

You should only be writing to out[0], and never to out[10]. The out pointer is advanced automatically and root() is run on each cell in your input/output allocations. Each individual cell has this function called with a valid in/out pointer pair that really maps to in[y][x], out[y][x] (or 1D as appropriate).