Function scale8_to_16_accurate

src/fl/gfx/hsv16.cpp.hpp:11–17

Improved 8-bit to 16-bit scaling using the same technique as map8_to_16 but with proper rounding for the 0-255 to 0-65535 conversion

// Improved 8-bit to 16-bit scaling using the same technique as map8_to_16
// but with proper rounding for the 0-255 to 0-65535 conversion
static inline u16 scale8_to_16_accurate(u8 x) {
    if (x == 0) return 0;
    if (x == 255) return 65535;
    // Use 32-bit arithmetic with rounding: (x * 65535 + 127) / 255
    // This is equivalent to: (x * 65535 + 255/2) / 255
    return (u16)(((u32)x * 65535 + 127) / 255);
}

static HSV16 RGBtoHSV16(const CRGB &rgb) {
    // Work with 8-bit values directly