streamtools/rescalers/public.hpp

   1 #ifndef _rescalers__public__hpp__included__
   2 #define _rescalers__public__hpp__included__
   3
   4 #include <stdint.h>
   5 #include <string>
   6 #include <list>
   7 #include <map>
   8
   9 class rescaler
  10 {
  11 public:
  12         virtual ~rescaler();
  13         virtual void operator()(uint8_t* target, uint32_t twidth, uint32_t theight,
  14                 const uint8_t* source, uint32_t swidth, uint32_t sheight) = 0;
  15         static rescaler& make(const std::string& type);
  16 };
  17
  18 struct parsed_scaler
  19 {
  20         bool is_special;
  21         uint32_t swidth;        //Meaningful only if is_special is set.
  22         uint32_t sheight;       //Meaningful only if is_special is set.
  23         rescaler* use_rescaler;
  24 };
  25
  26 std::string get_rescaler_string();
  27 std::list<std::string> get_rescaler_list();
  28 rescaler& composite_rescaler(rescaler& s1, uint32_t iwidth, uint32_t iheight, rescaler& s2);
  29 struct parsed_scaler parse_rescaler_expression(const std::string& expr);
  30 rescaler& get_default_rescaler();
  31
  32 class rescaler_group
  33 {
  34 public:
  35         rescaler_group(rescaler& _default_rescaler);
  36         ~rescaler_group();
  37         void set_default_rescaler(rescaler& _default_rescaler);
  38         void set_special_rescaler(uint32_t width, uint32_t height, rescaler& rescaler);
  39         void operator()(uint8_t* target, uint32_t twidth, uint32_t theight,
  40                 const uint8_t* source, uint32_t swidth, uint32_t sheight);
  41 private:
  42         rescaler* default_rescaler;
  43         std::map<std::pair<uint32_t, uint32_t>, rescaler*> special_rescalers;
  44 };
  45
  46 #endif