gamma.hpp

Go to the documentation of this file.

 
#ifndef MODES_GAMMA8_H
#define MODES_GAMMA8_H
 
#include <cstdint>
 
namespace lampda::modes::colors {
 
namespace __internal {
 
static constexpr uint8_t gammaT[256] = {
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   1,   1,   1,   1,   1,   1,   1,   1,   1,   1,   1,   1,   1,   2,   2,   2,
        2,   2,   2,   2,   2,   3,   3,   3,   3,   3,   3,   3,   4,   4,   4,   4,   4,   5,   5,   5,   5,   6,
        6,   6,   6,   7,   7,   7,   7,   8,   8,   8,   9,   9,   9,   10,  10,  10,  11,  11,  11,  12,  12,  13,
        13,  13,  14,  14,  15,  15,  16,  16,  17,  17,  18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  24,
        24,  25,  25,  26,  27,  27,  28,  29,  29,  30,  31,  32,  32,  33,  34,  35,  35,  36,  37,  38,  39,  39,
        40,  41,  42,  43,  44,  45,  46,  47,  48,  49,  50,  50,  51,  52,  54,  55,  56,  57,  58,  59,  60,  61,
        62,  63,  64,  66,  67,  68,  69,  70,  72,  73,  74,  75,  77,  78,  79,  81,  82,  83,  85,  86,  87,  89,
        90,  92,  93,  95,  96,  98,  99,  101, 102, 104, 105, 107, 109, 110, 112, 114, 115, 117, 119, 120, 122, 124,
        126, 127, 129, 131, 133, 135, 137, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 167,
        169, 171, 173, 175, 177, 180, 182, 184, 186, 189, 191, 193, 196, 198, 200, 203, 205, 208, 210, 213, 215, 218,
        220, 223, 225, 228, 231, 233, 236, 239, 241, 244, 247, 249, 252, 255};
 
#if 0
// re-calculates & fills gamma table
void calcGammaTable(float gamma)
{
  for (size_t i = 0; i < 256; i++)
  {
    __internal::gammaT[i] = (int)(powf((float)i / 255.0f, gamma) * 255.0f + 0.5f);
  }
}
#endif
 
} // namespace __internal
 
static constexpr uint8_t gamma8(uint8_t value) { return __internal::gammaT[value]; }
 
} // namespace lampda::modes::colors
 
#endif