SWCA.cs

public enum AccentState
{
    ACCENT_DISABLED = 0,                    // Black and solid background
    ACCENT_ENABLE_GRADIENT = 1,             // Custom-colored solid background
    ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,  // Custom-colored transparent background
    ACCENT_ENABLE_BLURBEHIND = 3,           // Custom-colored and blurred transparent background
    ACCENT_ENABLE_FLUENT = 4,               // Custom-colored Fluent effect
    ACCENT_INVALID_STATE = 5                // Completely transparent background
}

[StructLayout(LayoutKind.Sequential)]
private struct AccentPolicy
{
    AccentState AccentState;
    int AccentFlags;              // Set to 2 to have a custom color if possible. If not possible, custom color is ignored anyways
    uint GradientColor;           // Custom color in format AABBGGRR
    int AnimationId;              // No idea what this does
}