I have an image (1024x1024x3) that needs to be process pixel-by-pixel. The
per-pixel processing code is written using javascript. I've found that it
takes 277ms to loop through this handler in c++ code, and only 10ms to loop
in javascript code. I want to know how to make the c++ call javascript
function as fast as possible.
//javascript per-pixel processing function
var pixelfunction=function( rgb , index )
{
var outval = (rgb[0]-rgb[1]/(rgb[0]+rgb[1]) ;
return outval;
}
//c++ codes loop call pixelfunction
...
v8::Function* pixelFunc = ...; // this Function pointer is pixelfunction in
javascript.
v8::Local<v8::Uint8Array> vals = ...; //
v8::Local<Value> targs[2] ;
for(int it = 0 ;it<1024*1024;++it)
{
vals = ...; // get r,g,b values from image ;
targs[0] = vals;
targs[1] = v8::Integer::New( global , it );
pixelFunc->Call( context , context->Global() , 2 , targs);//For
convenience, I'm giving up the return value.
}
...
-
//javascript loop call:
var vals=new Uint8Array(3);
for(var it = 0 ; it < 1024*1024 ; ++it )
{
vals=...; //get r,g,b values from image
pixelfunction( vals , it );//For convenience, I'm giving up the return
value.
}
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