pub fn decode(blurhash: &str, width: u32, height: u32, punch: f32) -> Result<Vec<u8>, Error> {
    let (num_x, num_y) =
        extract_hash_dimensions(
            blurhash,
        )?;

    let quantised_maximum_value =
        base83::decode(
            &blurhash[1..2],
        )?;

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

    let mut colors =
        vec![[0.; 3]; num_x * num_y];

    for i in 0..colors.len() {
        if i == 0 {
            let value =
                base83::decode(
                    &blurhash[2..6],
                )?;

            colors[i as usize] =
                direct_current::decode(
                    value as u32,
                );

            continue;
        }

        let value =
            base83::decode(
                &blurhash[4 + i * 2..6 + i * 2]
            )?;

        colors[i as usize] =
            alternating_current::decode(
                value as u32,
                maximum_value * punch,
            );
    }

    let bytes_per_row = width * 4;
    let mut pixels = vec![0; (bytes_per_row * height) as usize];

    for y in 0..height {
        for x in 0..width {
            let mut pixel = [0.; 3];

            for j in 0..num_y {
                for i in 0..num_x {
                    let basis =
                        f32::cos((PI * x as f32 * i as f32) / width as f32)
                            * f32::cos((PI * y as f32 * j as f32) / height as f32);

                    let color =
                        &colors[i + j * num_x as usize];

                    pixel[0] += color[0] * basis;
                    pixel[1] += color[1] * basis;
                    pixel[2] += color[2] * basis;
                }
            }

            let int_r = linear_to_srgb(pixel[0]);
            let int_g = linear_to_srgb(pixel[1]);
            let int_b = linear_to_srgb(pixel[2]);

            pixels[(4 * x + y * bytes_per_row) as usize] = int_r as u8;
            pixels[(4 * x + 1 + y * bytes_per_row) as usize] = int_g as u8;
            pixels[(4 * x + 2 + y * bytes_per_row) as usize] = int_b as u8;
            pixels[(4 * x + 3 + y * bytes_per_row) as usize] = 255u8;
        }
    }
    Ok(pixels)
}
/// Decodes the given blurhash to an image of the specified size.
///
/// The punch parameter can be used to de- or increase the contrast of the
/// resulting image.
Decodes the given blurhash to an image of the specified size.
The punch parameter can be used to de- or increase the contrast of the
resulting image.
Decodes the given blurhash to an image of the specified size . The punch parameter can be used to de - or increase the contrast of the resulting image .
pub fn decode(blurhash: &str, width: u32, height: u32, punch: f32) -> Result<Vec<u8>, Error> {
    let (num_x, num_y) =
        extract_hash_dimensions(
            blurhash,
        )?;
    let quantised_maximum_value =
        base83::decode(
            &blurhash[1..2],
        )?;
    let maximum_value =
        (quantised_maximum_value + 1) as f32 / 166.;
    let mut colors =
        vec![[0.; 3]; num_x * num_y];
    for i in 0..colors.len() {
        if i == 0 {
            let value =
                base83::decode(
                    &blurhash[2..6],
                )?;
            colors[i as usize] =
                direct_current::decode(
                    value as u32,
                );
            continue;
        }
        let value =
            base83::decode(
                &blurhash[4 + i * 2..6 + i * 2]
            )?;
        colors[i as usize] =
            alternating_current::decode(
                value as u32,
                maximum_value * punch,
            );
    }
    let bytes_per_row = width * 4;
    let mut pixels = vec![0; (bytes_per_row * height) as usize];
    for y in 0..height {
        for x in 0..width {
            let mut pixel = [0.; 3];
            for j in 0..num_y {
                for i in 0..num_x {
                    let basis =
                        f32::cos((PI * x as f32 * i as f32) / width as f32)
                            * f32::cos((PI * y as f32 * j as f32) / height as f32);
                    let color =
                        &colors[i + j * num_x as usize];
                    pixel[0] += color[0] * basis;
                    pixel[1] += color[1] * basis;
                    pixel[2] += color[2] * basis;
                }
            }
            let int_r = linear_to_srgb(pixel[0]);
            let int_g = linear_to_srgb(pixel[1]);
            let int_b = linear_to_srgb(pixel[2]);
            pixels[(4 * x + y * bytes_per_row) as usize] = int_r as u8;
            pixels[(4 * x + 1 + y * bytes_per_row) as usize] = int_g as u8;
            pixels[(4 * x + 2 + y * bytes_per_row) as usize] = int_b as u8;
            pixels[(4 * x + 3 + y * bytes_per_row) as usize] = 255u8;
        }
    }
    Ok(pixels)
}
pub fn decode ( blurhash : & str , width : u32 , height : u32 , punch : f32 ) -> Result < Vec < u8 > , Error > { let ( num_x , num_y ) = extract_hash_dimensions ( blurhash , ) ? ; let quantised_maximum_value = base83 :: decode ( & blurhash [ 1 .. 2 ] , ) ? ; let maximum_value = ( quantised_maximum_value + 1 ) as f32 / 166. ; let mut colors = vec ! [ [ 0. 3 ] num_x num_y ] ; for i in 0 .. colors . len ( ) { if i == 0 { let value = base83 :: decode ( & blurhash [ 2 .. 6 ] , ) ? ; colors [ i as usize ] = direct_current :: decode ( value as u32 , ) ; continue ; } let value = base83 :: decode ( & blurhash [ 4 + i * 2 .. 6 + i * 2 ] ) ? ; colors [ i as usize ] = alternating_current :: decode ( value as u32 , maximum_value * punch , ) ; } let bytes_per_row = width * 4 ; let mut pixels = vec ! [ 0 ( bytes_per_row height ) as usize ] ; for y in 0 .. height { for x in 0 .. width { let mut pixel = [ 0. ; 3 ] ; for j in 0 .. num_y { for i in 0 .. num_x { let basis = f32 :: cos ( ( PI * x as f32 * i as f32 ) / width as f32 ) * f32 :: cos ( ( PI * y as f32 * j as f32 ) / height as f32 ) ; let color = & colors [ i + j * num_x as usize ] ; pixel [ 0 ] += color [ 0 ] * basis ; pixel [ 1 ] += color [ 1 ] * basis ; pixel [ 2 ] += color [ 2 ] * basis ; } } let int_r = linear_to_srgb ( pixel [ 0 ] ) ; let int_g = linear_to_srgb ( pixel [ 1 ] ) ; let int_b = linear_to_srgb ( pixel [ 2 ] ) ; pixels [ ( 4 * x + y * bytes_per_row ) as usize ] = int_r as u8 ; pixels [ ( 4 * x + 1 + y * bytes_per_row ) as usize ] = int_g as u8 ; pixels [ ( 4 * x + 2 + y * bytes_per_row ) as usize ] = int_b as u8 ; pixels [ ( 4 * x + 3 + y * bytes_per_row ) as usize ] = 255u8 ; } } Ok ( pixels ) }
Decodes the given blurhash to an image of the specified size.
Decodes the given blurhash to an image of the specified size .
blurhash
&str
width
u32
height
u32
punch
f32