Function parseHexColor

src/fl/control/wled/json_helpers.cpp.hpp:10–44

Helper function to parse hex color string to RGB

// Helper function to parse hex color string to RGB
bool parseHexColor(const fl::string& hexStr, u8& r, u8& g, u8& b) {
    fl::string hex = hexStr;

    // Strip leading '#' if present
    if (hex.length() > 0 && hex[0] == '#') {
        hex = hex.substr(1);
    }

    // Validate length (must be exactly 6 characters)
    if (hex.length() != 6) {
        return false;
    }

    // Validate hex characters
    for (size_t i = 0; i < hex.length(); i++) {
        char c = hex[i];
        if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'))) {
            return false;
        }
    }

    // Parse hex digits
    auto hexDigitToInt = [](char c) -> u8 {
        if (c >= '0' && c <= '9') return c - '0';
        if (c >= 'a' && c <= 'f') return c - 'a' + 10;
        if (c >= 'A' && c <= 'F') return c - 'A' + 10;
        return 0;
    };

    r = (hexDigitToInt(hex[0]) << 4) | hexDigitToInt(hex[1]);
    g = (hexDigitToInt(hex[2]) << 4) | hexDigitToInt(hex[3]);
    b = (hexDigitToInt(hex[4]) << 4) | hexDigitToInt(hex[5]);

    return true;
}

// Helper function to convert RGB to hex string
fl::string rgbToHex(u8 r, u8 g, u8 b) {