c# - Byte comparison uses so much CPU -

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well have function compare red, blue, green, , alpha pixels in image comparison loop comparing 2 images

code:

var o = 255 - c1.a; var t = tolerance < o ? o : tolerance; var b = aresimiliar(ref c1.b, ref c2.b, ref t); var g = aresimiliar(ref c1.g, ref c2.g, ref t); var r = aresimiliar(ref c1.r, ref c2.r, ref t); if (b && g && r) continue;  [methodimpl(methodimploptions.aggressiveinlining)]  private static bool aresimiliar(ref byte v1, ref byte v2, ref double tolerance) {     var z = v1 - v2;     var t = z > 0 ? z : -z;     return t <= tolerance; }

the problem uses cpu although no external code being used, , testing narrowed down code causes load.

try instead

var o = 255 - c1.a; var t = tolerance < o ? o : tolerance; if (aresimiliar(c1.b, c2.b, t) &&      aresimiliar(c1.g, c2.g, t) &&     aresimiliar(c1.r, c2.r, t)) continue;  [methodimpl(methodimploptions.aggressiveinlining)]  private static bool aresimiliar(byte v1, byte v2, double tolerance) {     var z = v1 - v2;     var t = z > 0 ? z : -z;     return t <= tolerance; }

this might better

        var o = 255 - c1.a;         var t = tolerance < o ? o : tolerance;         if (abs(c1.b - c2.b) <= t) & //or &&             abs(c1.g - c2.g) <= t) & //or &&             abs(c1.r - c2.r) <= t)) continue;      [methodimpl(methodimploptions.aggressiveinlining)]     private static int abs(int d)     {         int y = (d >> 31);          return (d ^ y) - y;     }

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