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#include <filesystem>
#include <fstream>
#include "colormaps.h"
#include "nlohmann/json.hpp"
namespace colormaps
{
Map loadMap(std::string path)
{
std::ifstream file(path.c_str());
nlohmann::json data;
file >> data;
file.close();
Map map;
std::vector<std::string> mapTxt;
try
{
map.name = data["name"];
map.author = data["author"];
mapTxt = data["map"].get<std::vector<std::string>>();
}
catch (const std::exception &)
{
return map;
}
map.entryCount = mapTxt.size();
map.map = new float[mapTxt.size() * 3];
int i = 0;
for (auto const &col : mapTxt)
{
// uint8_t r, g, b, a;
map.map[i * 3] = std::stoi(col.substr(1, 2), NULL, 16);
map.map[(i * 3) + 1] = std::stoi(col.substr(3, 2), NULL, 16);
map.map[(i * 3) + 2] = std::stoi(col.substr(5, 2), NULL, 16);
i++;
}
return map;
}
std::vector<uint32_t> generatePalette(Map map, int resolution)
{
int colorCount = map.entryCount;
std::vector<uint32_t> waterfallPallet(resolution);
for (int i = 0; i < resolution; i++)
{
int lowerId = floorf(((float)i / (float)resolution) * colorCount);
int upperId = ceilf(((float)i / (float)resolution) * colorCount);
lowerId = std::clamp<int>(lowerId, 0, colorCount - 1);
upperId = std::clamp<int>(upperId, 0, colorCount - 1);
float ratio = (((float)i / (float)resolution) * colorCount) - lowerId;
float r = (map.map[(lowerId * 3) + 0] * (1.0 - ratio)) + (map.map[(upperId * 3) + 0] * (ratio));
float g = (map.map[(lowerId * 3) + 1] * (1.0 - ratio)) + (map.map[(upperId * 3) + 1] * (ratio));
float b = (map.map[(lowerId * 3) + 2] * (1.0 - ratio)) + (map.map[(upperId * 3) + 2] * (ratio));
waterfallPallet[i] = ((uint32_t)255 << 24) | ((uint32_t)b << 16) | ((uint32_t)g << 8) | (uint32_t)r;
}
return waterfallPallet;
}
}
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