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edited May 14 at 10:20

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Which implemenation is prefered? (translating Translating an image encoded as u32 to an array)

I have a function in an embedded system which translatetranslates an image encoded in a 32 bit-bit integer to 3x9 matrix (an array of arrays):

Which is the preferred implementation, and why? Is there an even better waysway of writing it?

comparative-review rust

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asked May 14 at 6:38

Simson

Which implemenation is prefered? (translating an u32 to an array)

I have a function in an embedded system which translate an image encoded in a 32 bit integer to 3x9 matrix (an array of arrays)

    pub fn image_to_preformated_vector(image: u32) -> [[u8; 9]; 3] {
        [
            [
                1 & (image >> 0) as u8,
                1 & (image >> 1) as u8,
                1 & (image >> 2) as u8,
                1 & (image >> 3) as u8,
                1 & (image >> 4) as u8,
                1 & (image >> 5) as u8,
                1 & (image >> 6) as u8,
                1 & (image >> 7) as u8,
                1 & (image >> 8) as u8,
            ],
            [
                1 & (image >> 9) as u8,
                1 & (image >> 10) as u8,
                1 & (image >> 11) as u8,
                1 & (image >> 12) as u8,
                1 & (image >> 13) as u8,
                1 & (image >> 14) as u8,
                1 & (image >> 15) as u8,
                1 & (image >> 16) as u8,
                1 & (image >> 17) as u8,
            ],
            [
                1 & (image >> 18) as u8,
                1 & (image >> 19) as u8,
                1 & (image >> 20) as u8,
                1 & (image >> 21) as u8,
                1 & (image >> 22) as u8,
                1 & (image >> 23) as u8,
                1 & (image >> 24) as u8,
                1 & (image >> 25) as u8,
                1 & (image >> 26) as u8,
            ],
        ]
    }

Alternative implementation

    pub fn image_to_preformated_vector(image: u32) -> [[u8; 9]; 3] {
        [
            [0, 1, 2, 3, 4, 5, 6, 7, 8],
            [9, 10, 11, 12, 13, 14, 15, 16, 17],
            [18, 19, 20, 21, 22, 23, 24, 25, 26],
        ]
        .map(|v| v.map(|i| 1_u8 & (image >> i) as u8))
    }

Which is the preferred implementation, and why? Is there an even better ways of writing it?

rust