Function libwebp::WebPEncodeBGRA

pub fn WebPEncodeBGRA(
    bgra: &[u8], 
    width: u32, 
    height: u32, 
    stride: u32, 
    quality_factor: f32
) -> Result<WebpBox<[u8]>, WebPSimpleError>

Same as WebPEncodeRGBA, but expecting B, G, R, A, B, G, R, A... ordered data.