streamtools/resize-linear-separable.hpp

   1 #ifndef _resize_linear_separable__hpp__included__
   2 #define _resize_linear_separable__hpp__included__
   3
   4 #include "resize.hpp"
   5
   6 #define MAXCOEFFICIENTS 256
   7
   8 typedef signed long long position_t;
   9
  10
  11
  12 class resizer_linear_separable : public resizer
  13 {
  14 public:
  15         void operator()(uint8_t* target, uint32_t twidth, uint32_t theight,
  16                 const uint8_t* source, uint32_t swidth, uint32_t sheight);
  17 protected:
  18         //Fill coeffs, base and coeffcount. Coeffs is set of floating-point coefficients for pixels
  19         //starting from pixel number base (zero-based) and numbering coeffcount. Take care not to refer
  20         //to pixel outside range [0,width). Twidth is target width.
  21         //num / denum gives position of pixel being approximated. The coordinate range is [0, width),
  22         //width giving the width of original data.
  23         virtual void compute_coeffs(float* coeffs, position_t num, position_t denum, position_t width,
  24                 position_t twidth, unsigned& base, unsigned& coeffcount) = 0;
  25 };
  26
  27 class simple_resizer_linear_separable : public resizer_factory
  28 {
  29 public:
  30         simple_resizer_linear_separable(const std::string& type, void(*coeffs_fn)(float* coeffs, position_t num,
  31                         position_t denum, position_t width, position_t twidth, unsigned& base, unsigned& coeffcount));
  32         simple_resizer_linear_separable(const std::string& type, void(*coeffs_fn)(float* coeffs, position_t num,
  33                         position_t denum, position_t width, position_t twidth, unsigned& base, unsigned& coeffcount,
  34                         int algo), int algo);
  35         resizer& make(const std::string& type);
  36 private:
  37         void(*coeffs_fn)(float* coeffs, position_t newsize, position_t oldsize, position_t width, position_t twidth,
  38                 unsigned& base, unsigned& coeffcount);
  39         void(*coeffs_fn2)(float* coeffs, position_t newsize, position_t oldsize, position_t width,
  40                 position_t twidth, unsigned& base, unsigned& coeffcount, int algo);
  41         int algo;
  42 };
  43
  44 #endif