How to bulid new  layer blend modes?

please look link: https://forums.adobe.com/thread/1755389
I did not learn Microsoft Visual Studio, I want to use my algorithms,  have same functionin   as The layer blend modes in photoshop , but algorithm  not the same , written in JavaScript to run very slowly, pls help me.
  thx

inline unsigned8 Mul8x8Div255 (unsigned8 a, unsigned8 b)
  unsigned32 temp = (unsigned32)a * (unsigned32)b + 128;    //how modify here?
  return static_cast<unsigned8>((temp + (temp >> 8)) >> 8);  //how  modify  here?
inline unsigned16 Mul16x16Div32768 (unsigned16 a, unsigned16 b)
  unsigned32 temp = (unsigned32)a * (unsigned32)b + 16384; ////how  modify here?
  return (unsigned16) (temp >> 15);   ////how  modify here?             
inline float Mul32x32(float a, float b)              
  if(a>=b){
rerurn  255-(510-a-b-(255-a)*(255-b)*(b+255)/(255*255)); //here ok
else {
return 255-(510-a-b-(255-a)*(255-b)*(a+255)/(255*255)); //here ok
pls help me
how modify:
inline unsigned8 Mul8x8Div255 (unsigned8 a, unsigned8 b)
  unsigned32 temp = (unsigned32)a * (unsigned32)b + 128;    //how modify here?
  return static_cast<unsigned8>((temp + (temp >> 8)) >> 8);  //how  modify  here?
inline unsigned16 Mul16x16Div32768 (unsigned16 a, unsigned16 b)
  unsigned32 temp = (unsigned32)a * (unsigned32)b + 16384; ////how  modify here?
  return (unsigned16) (temp >> 15);   ////how  modify here?             

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