streamtools/rescalers/bilinear.cpp

   1 #include "rescalers/linear-separable.hpp"
   2 #include <stdint.h>
   3 #include <cmath>
   4 #include <stdexcept>
   5
   6 namespace
   7 {
   8         void compute_coefficients_bilinear(float* coeffs, position_t num, position_t denum, position_t width,
   9                 position_t twidth, unsigned& count, unsigned& base)
  10         {
  11                 base = num / denum;
  12                 if(base < width - 1) {
  13                         float fpos = (num % denum) / (float)denum;
  14                         coeffs[0] = 1 - fpos;
  15                         coeffs[1] = fpos;
  16                         count = 2;
  17                 } else {
  18                         coeffs[0] = 1;
  19                         count = 1;
  20                 }
  21         }
  22
  23         simple_rescaler_linear_separable r_bilinear("bilinear", make_bound_method(compute_coefficients_bilinear));
  24 }