1/C Calculation

• Note that the 1/C computation is common for derivatives of Z,R,G,B,A,S,T

  • Only computed one time

• The sign of 1/C is used to determine if major edge is on left or right side

  • if 1/C < 0 , then major edge on left side
  • if 1/C >= 0, then major edge on right side

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