parseHexColor()

bool fl::wled::parseHexColor	(	const fl::string &	hexStr,
		u8 &	r,
		u8 &	g,
		u8 &	b )

Parse hex color string to RGB components.

Parameters

hexStr	Hex color string (e.g., "FF0000" or "#FF0000")
r	Output: red component (0-255)
g	Output: green component (0-255)
b	Output: blue component (0-255)

Returns

true if parsing succeeded, false otherwise

Supports formats:

• "RRGGBB" (6 hex digits)
• "#RRGGBB" (# prefix optional)

Definition at line 10 of file json_helpers.cpp.hpp.

                                                                {
    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;
}

References fl::hex.

Referenced by parseSegmentFields().

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