HexColorToVehicleColor(color, ColorFormat:format = RGBA);

#define RED 0xFF0000FF // RGBA
#define GREEN 0x00FF00 // RGB

// set color1 to RED and color2 to GREEN
ChangeVehicleColor(vehicleid, HexColorToVehicleColor(RED), HexColorToVehicleColor(GREEN, RGB));

new someColorFromSomeWebpage = 0xFAB2AFCC;
printf("equivalent to %x: %d", someColorFromSomeWebpage, HexColorToVehicleColor(someColorFromSomeWebpage));

// by lleps
enum ColorFormat {
    RGBA,
    ARGB,
    RGB
}

// %0 means src and %1 byte number (starting from zero)
#define getByteN(%0,%1) ((%0 >> (%1*8)) & 0xFF)

stock getR(color, ColorFormat:format) {
    switch(format) {
        case RGBA: {
            return getByteN(color,3);
        }
        case ARGB: {
            return getByteN(color,2);
        }
        case RGB: {
            return getByteN(color,2);
        }
    }
    return 0;
}

stock getG(color, ColorFormat:format) {
    switch(format) {
        case RGBA: {
            return getByteN(color,2);
        }
        case ARGB: {
            return getByteN(color,1);
        }
        case RGB: {
            return getByteN(color,1);
        }
    }
    return 0; // unknown format
}

stock getB(color, ColorFormat:format) {
    switch(format) {
        case RGBA: {
            return getByteN(color,1);
        }
        case ARGB: {
            return getByteN(color,0);
        }
        case RGB: {
            return getByteN(color,0);
        }
    }
    return 0;
}

new VehicleColoursTableRGBA[256] =
{
    // The existing colours from San Andreas
    0x000000FF, 0xF5F5F5FF, 0x2A77A1FF, 0x840410FF, 0x263739FF, 0x86446EFF, 0xD78E10FF, 0x4C75B7FF, 0xBDBEC6FF, 0x5E7072FF,
    0x46597AFF, 0x656A79FF, 0x5D7E8DFF, 0x58595AFF, 0xD6DAD6FF, 0x9CA1A3FF, 0x335F3FFF, 0x730E1AFF, 0x7B0A2AFF, 0x9F9D94FF,
    0x3B4E78FF, 0x732E3EFF, 0x691E3BFF, 0x96918CFF, 0x515459FF, 0x3F3E45FF, 0xA5A9A7FF, 0x635C5AFF, 0x3D4A68FF, 0x979592FF,
    0x421F21FF, 0x5F272BFF, 0x8494ABFF, 0x767B7CFF, 0x646464FF, 0x5A5752FF, 0x252527FF, 0x2D3A35FF, 0x93A396FF, 0x6D7A88FF,
    0x221918FF, 0x6F675FFF, 0x7C1C2AFF, 0x5F0A15FF, 0x193826FF, 0x5D1B20FF, 0x9D9872FF, 0x7A7560FF, 0x989586FF, 0xADB0B0FF,
    0x848988FF, 0x304F45FF, 0x4D6268FF, 0x162248FF, 0x272F4BFF, 0x7D6256FF, 0x9EA4ABFF, 0x9C8D71FF, 0x6D1822FF, 0x4E6881FF,
    0x9C9C98FF, 0x917347FF, 0x661C26FF, 0x949D9FFF, 0xA4A7A5FF, 0x8E8C46FF, 0x341A1EFF, 0x6A7A8CFF, 0xAAAD8EFF, 0xAB988FFF,
    0x851F2EFF, 0x6F8297FF, 0x585853FF, 0x9AA790FF, 0x601A23FF, 0x20202CFF, 0xA4A096FF, 0xAA9D84FF, 0x78222BFF, 0x0E316DFF,
    0x722A3FFF, 0x7B715EFF, 0x741D28FF, 0x1E2E32FF, 0x4D322FFF, 0x7C1B44FF, 0x2E5B20FF, 0x395A83FF, 0x6D2837FF, 0xA7A28FFF,
    0xAFB1B1FF, 0x364155FF, 0x6D6C6EFF, 0x0F6A89FF, 0x204B6BFF, 0x2B3E57FF, 0x9B9F9DFF, 0x6C8495FF, 0x4D8495FF, 0xAE9B7FFF,
    0x406C8FFF, 0x1F253BFF, 0xAB9276FF, 0x134573FF, 0x96816CFF, 0x64686AFF, 0x105082FF, 0xA19983FF, 0x385694FF, 0x525661FF,
    0x7F6956FF, 0x8C929AFF, 0x596E87FF, 0x473532FF, 0x44624FFF, 0x730A27FF, 0x223457FF, 0x640D1BFF, 0xA3ADC6FF, 0x695853FF,
    0x9B8B80FF, 0x620B1CFF, 0x5B5D5EFF, 0x624428FF, 0x731827FF, 0x1B376DFF, 0xEC6AAEFF, 0x000000FF,
    // SA-MP extended colours (0.3x)
    0x177517FF, 0x210606FF, 0x125478FF, 0x452A0DFF, 0x571E1EFF, 0x010701FF, 0x25225AFF, 0x2C89AAFF, 0x8A4DBDFF, 0x35963AFF,
    0xB7B7B7FF, 0x464C8DFF, 0x84888CFF, 0x817867FF, 0x817A26FF, 0x6A506FFF, 0x583E6FFF, 0x8CB972FF, 0x824F78FF, 0x6D276AFF,
    0x1E1D13FF, 0x1E1306FF, 0x1F2518FF, 0x2C4531FF, 0x1E4C99FF, 0x2E5F43FF, 0x1E9948FF, 0x1E9999FF, 0x999976FF, 0x7C8499FF,
    0x992E1EFF, 0x2C1E08FF, 0x142407FF, 0x993E4DFF, 0x1E4C99FF, 0x198181FF, 0x1A292AFF, 0x16616FFF, 0x1B6687FF, 0x6C3F99FF,
    0x481A0EFF, 0x7A7399FF, 0x746D99FF, 0x53387EFF, 0x222407FF, 0x3E190CFF, 0x46210EFF, 0x991E1EFF, 0x8D4C8DFF, 0x805B80FF,
    0x7B3E7EFF, 0x3C1737FF, 0x733517FF, 0x781818FF, 0x83341AFF, 0x8E2F1CFF, 0x7E3E53FF, 0x7C6D7CFF, 0x020C02FF, 0x072407FF,
    0x163012FF, 0x16301BFF, 0x642B4FFF, 0x368452FF, 0x999590FF, 0x818D96FF, 0x99991EFF, 0x7F994CFF, 0x839292FF, 0x788222FF,
    0x2B3C99FF, 0x3A3A0BFF, 0x8A794EFF, 0x0E1F49FF, 0x15371CFF, 0x15273AFF, 0x375775FF, 0x060820FF, 0x071326FF, 0x20394BFF,
    0x2C5089FF, 0x15426CFF, 0x103250FF, 0x241663FF, 0x692015FF, 0x8C8D94FF, 0x516013FF, 0x090F02FF, 0x8C573AFF, 0x52888EFF,
    0x995C52FF, 0x99581EFF, 0x993A63FF, 0x998F4EFF, 0x99311EFF, 0x0D1842FF, 0x521E1EFF, 0x42420DFF, 0x4C991EFF, 0x082A1DFF,
    0x96821DFF, 0x197F19FF, 0x3B141FFF, 0x745217FF, 0x893F8DFF, 0x7E1A6CFF, 0x0B370BFF, 0x27450DFF, 0x071F24FF, 0x784573FF,
    0x8A653AFF, 0x732617FF, 0x319490FF, 0x56941DFF, 0x59163DFF, 0x1B8A2FFF, 0x38160BFF, 0x041804FF, 0x355D8EFF, 0x2E3F5BFF,
    0x561A28FF, 0x4E0E27FF, 0x706C67FF, 0x3B3E42FF, 0x2E2D33FF, 0x7B7E7DFF, 0x4A4442FF, 0x28344EFF
};

stock HexColorToVehColor(color, ColorFormat:format = RGBA) {
    new srcR = getR(color,format), srcG = getG(color,format), srcB = getB(color,format);
    new closerColorIdx = 0;
    new minTotal = 0xFFFFFF;

    for (new i; i < sizeof(VehicleColoursTableRGBA); i++) {
        new iR = getR(VehicleColoursTableRGBA[i], RGBA);
        new iG = getG(VehicleColoursTableRGBA[i], RGBA);
        new iB = getB(VehicleColoursTableRGBA[i], RGBA);
        
        new rDiff = floatround(floatabs(iR - srcR)),
            gDiff = floatround(floatabs(iG - srcG)),
            bDiff = floatround(floatabs(iB - srcB));
            
        new total = rDiff + gDiff + bDiff;

        if (total < minTotal) {
            minTotal = total;
            closerColorIdx = i;
        }
    }
    return closerColorIdx;
}