Thanks Yang. But I have to define the processing algorithm in javascript. Feng Wang 邮箱：[email protected] 签名由 网易邮箱大师 定制 On 05/16/2020 22:03, Yang Guo wrote: Put everything into an ArrayBuffer and call C++ just once. On Sat, May 16, 2020, 15:07 Feng Wang <[email protected]> wrote: 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. } -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/dd3c7a28-1144-4e5f-a982-15e8558d7e5c%40googlegroups.com. -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CAFSTc_g3hQ9P3bevpXqjux%2BZa%3DMcZmQRyjQ-uD62Mi3w_tkezg%40mail.gmail.com.
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