notcurses/tests/internal.cpp

#include <string>
#include <cstdlib>
#include <clocale>
#include "internal.h"
#include "main.h"

TEST_CASE("RGBtoANSIWhite") {
  unsigned r, g, b;
  for(r = 250 ; r < 256 ; ++r){
    g = b = r;
    CHECK(15 == rgb_quantize_256(r, g, b));
  }
}

TEST_CASE("RGBtoANSIBlack") {
  unsigned r, g, b;
  for(r = 0 ; r < 10 ; ++r){
    g = b = r;
    CHECK(0 == rgb_quantize_256(r, g, b));
  }
}

TEST_CASE("RGBtoANSIGrey") {
  unsigned r, g, b;
  for(r = 10 ; r < 244 ; ++r){
    g = b = r;
    CHECK(231 + (r * 5) / 49 == rgb_quantize_256(r, g, b));
  }
}

// Pure reds are either 0 (black), or 16 plus 36 * [0..5].
TEST_CASE("RGBtoANSIRed") {
  unsigned r, g, b;
  g = b = 0x0;
  for(r = 0 ; r < 256 ; ++r){
    int c256 = rgb_quantize_256(r, g, b);
    if(r < 8){
      CHECK(0 == c256);
    }else{
      CHECK(15 < c256);
      CHECK(16 == c256 % 36);
    }
  }
}

// Pure greens are either 0 (black), or 16 plus 6 * [0..5].
TEST_CASE("RGBtoANSIGreen") {
  unsigned r, g, b;
  r = b = 0x0;
  for(g = 0 ; g < 256 ; ++g){
    int c256 = rgb_quantize_256(r, g, b);
    CHECK(48 > c256);
    if(g < 8){
      CHECK(0 == c256);
    }else{
      CHECK(15 < c256);
      CHECK(4 == c256 % 6);
    }
  }
}

// Pure blues are either 0 (black), or one of the first 6 colors [16..22].
TEST_CASE("RGBtoANSIBlue") {
  unsigned r, g, b;
  r = g = 0x0;
  for(b = 0 ; b < 256 ; ++b){
    int c256 = rgb_quantize_256(r, g, b);
    CHECK(22 > c256);
    if(b < 8){
      CHECK(0 == c256);
    }else{
      CHECK(15 < c256);
    }
  }
}