question: get the above-left pixel from the buffer . concode_field_sep int bpp concode_elem_sep int width concode_elem_sep int height concode_field_sep void encode concode_elem_sep void setBpp concode_elem_sep int leftPixel concode_elem_sep int getBpp concode_elem_sep void main concode_elem_sep void encodeLine concode_elem_sep int getWidth concode_elem_sep void decode concode_elem_sep void setHeight concode_elem_sep void setWidth concode_elem_sep void checkBufsiz concode_elem_sep PredictorAlgorithm getFilter concode_elem_sep void decodeLine concode_elem_sep int getHeight concode_elem_sep int abovePixel concode_elem_sep void dump
target: int function ( byte [ ] arg0 , int arg1 , int arg2 , int arg3 ) { return arg1 >= arg2 && arg3 >= getBpp ( ) ? arg0 [ arg1 + arg3 - arg2 - getBpp ( ) ] : 0 ; }