pub fn encode(
    components_x: u32,
    components_y: u32,
    width: u32,
    height: u32,
    rgba_image: &[u8],
) -> Result<String, Error> {
    if !(1..=9).contains(&components_x)
        || !(1..=9).contains(&components_y)
    {
        return Err(Error::ComponentsOutOfRange);
    }

    let factors: Vec<[f32; 3]> = (0..components_y)
        .into_par_iter()
        .map(
            |y| {
                (0..components_x)
                    .into_par_iter()
                    .map(
                        |x| {
                            multiply_basis_function(
                                x,
                                y,
                                width,
                                height,
                                rgba_image,
                            )
                        }
                    )
                    .collect::<Vec<[f32; 3]>>()
            }
        )
        .flatten()
        .collect();

    let dc = factors[0];
    let ac = &factors[1..];

    let mut blurhash = String::new();

    let size_flag =
        (components_x - 1)
            + (components_y - 1)
            * 9;

    blurhash
        .push_str(
            &base83::encode(
                size_flag,
                1,
            ),
        );

    let maximum_value: f32;

    if !ac.is_empty() {
        let mut actualmaximum_value = 0.0;

        for i in 0..components_y * components_x - 1 {
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][0]), actualmaximum_value);
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][1]), actualmaximum_value);
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][2]), actualmaximum_value);
        }

        let quantised_maximum_value =
            f32::max(
                0.,
                f32::min(
                    82.,
                    f32::floor(
                        actualmaximum_value
                            * 166.
                            - 0.5,
                    ),
                ),
            ) as u32;

        maximum_value = (quantised_maximum_value + 1) as f32 / 166.;

        blurhash.push_str(&base83::encode(quantised_maximum_value, 1));
    } else {
        maximum_value = 1.;

        blurhash.push_str(&base83::encode(0, 1));
    }

    blurhash.push_str(&base83::encode(direct_current::encode(dc), 4));

    for i in 0..components_y * components_x - 1 {
        blurhash.push_str(&base83::encode(
            alternating_current::encode(ac[i as usize], maximum_value),
            2,
        ));
    }

    Ok(blurhash)
}
/// Calculates the blurhash for an image using the given x and y component counts.
Calculates the blurhash for an image using the given x and y component counts.
Calculates the blurhash for an image using the given x and y component counts .
pub fn encode(
    components_x: u32,
    components_y: u32,
    width: u32,
    height: u32,
    rgba_image: &[u8],
) -> Result<String, Error> {
    if !(1..=9).contains(&components_x)
        || !(1..=9).contains(&components_y)
    {
        return Err(Error::ComponentsOutOfRange);
    }
    let factors: Vec<[f32; 3]> = (0..components_y)
        .into_par_iter()
        .map(
            |y| {
                (0..components_x)
                    .into_par_iter()
                    .map(
                        |x| {
                            multiply_basis_function(
                                x,
                                y,
                                width,
                                height,
                                rgba_image,
                            )
                        }
                    )
                    .collect::<Vec<[f32; 3]>>()
            }
        )
        .flatten()
        .collect();
    let dc = factors[0];
    let ac = &factors[1..];
    let mut blurhash = String::new();
    let size_flag =
        (components_x - 1)
            + (components_y - 1)
            * 9;
    blurhash
        .push_str(
            &base83::encode(
                size_flag,
                1,
            ),
        );
    let maximum_value: f32;
    if !ac.is_empty() {
        let mut actualmaximum_value = 0.0;
        for i in 0..components_y * components_x - 1 {
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][0]), actualmaximum_value);
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][1]), actualmaximum_value);
            actualmaximum_value = f32::max(f32::abs(ac[i as usize][2]), actualmaximum_value);
        }
        let quantised_maximum_value =
            f32::max(
                0.,
                f32::min(
                    82.,
                    f32::floor(
                        actualmaximum_value
                            * 166.
                            - 0.5,
                    ),
                ),
            ) as u32;
        maximum_value = (quantised_maximum_value + 1) as f32 / 166.;
        blurhash.push_str(&base83::encode(quantised_maximum_value, 1));
    } else {
        maximum_value = 1.;
        blurhash.push_str(&base83::encode(0, 1));
    }
    blurhash.push_str(&base83::encode(direct_current::encode(dc), 4));
    for i in 0..components_y * components_x - 1 {
        blurhash.push_str(&base83::encode(
            alternating_current::encode(ac[i as usize], maximum_value),
            2,
        ));
    }
    Ok(blurhash)
}
pub fn encode ( components_x : u32 , components_y : u32 , width : u32 , height : u32 , rgba_image : & [ u8 ] , ) -> Result < String , Error > { if ! ( 1 ..= 9 ) . contains ( & components_x ) || ! ( 1 ..= 9 ) . contains ( & components_y ) { return Err ( Error :: ComponentsOutOfRange ) ; } let factors : Vec < [ f32 ; 3 ] > = ( 0 .. components_y ) . into_par_iter ( ) . map ( | y | { ( 0 .. components_x ) . into_par_iter ( ) . map ( | x | { multiply_basis_function ( x , y , width , height , rgba_image , ) } ) . collect :: < Vec < [ f32 ; 3 ] > > ( ) } ) . flatten ( ) . collect ( ) ; let dc = factors [ 0 ] ; let ac = & factors [ 1 .. ] ; let mut blurhash = String :: new ( ) ; let size_flag = ( components_x - 1 ) + ( components_y - 1 ) * 9 ; blurhash . push_str ( & base83 :: encode ( size_flag , 1 , ) , ) ; let maximum_value : f32 ; if ! ac . is_empty ( ) { let mut actualmaximum_value = 0.0 ; for i in 0 .. components_y * components_x - 1 { actualmaximum_value = f32 :: max ( f32 :: abs ( ac [ i as usize ] [ 0 ] ) , actualmaximum_value ) ; actualmaximum_value = f32 :: max ( f32 :: abs ( ac [ i as usize ] [ 1 ] ) , actualmaximum_value ) ; actualmaximum_value = f32 :: max ( f32 :: abs ( ac [ i as usize ] [ 2 ] ) , actualmaximum_value ) ; } let quantised_maximum_value = f32 :: max ( 0. , f32 :: min ( 82. , f32 :: floor ( actualmaximum_value * 166. - 0.5 , ) , ) , ) as u32 ; maximum_value = ( quantised_maximum_value + 1 ) as f32 / 166. ; blurhash . push_str ( & base83 :: encode ( quantised_maximum_value , 1 ) ) ; } else { maximum_value = 1. ; blurhash . push_str ( & base83 :: encode ( 0 , 1 ) ) ; } blurhash . push_str ( & base83 :: encode ( direct_current :: encode ( dc ) , 4 ) ) ; for i in 0 .. components_y * components_x - 1 { blurhash . push_str ( & base83 :: encode ( alternating_current :: encode ( ac [ i as usize ] , maximum_value ) , 2 , ) ) ; } Ok ( blurhash ) }
Calculates the blurhash for an image using the given x and y component counts.
Calculates the blurhash for an image using the given x and y component counts .
components_x
u32
components_y
u32
width
u32
height
u32
rgba_image
&[u8]