Function bgra32_to_bgr

rustcv-camera/src/decode.rs:200–207

Drop the alpha channel from BGRA32 to produce BGR24. 从 BGRA32 去掉 Alpha 通道，生成 BGR24。 Input: [B, G, R, A, B, G, R, A, ...] (4 bytes/pixel) Output: [B, G, R, B, G, R, ...] (3 bytes/pixel)

(src: &[u8], dst: &mut [u8])

/// Input:  [B, G, R, A, B, G, R, A, ...]  (4 bytes/pixel)
/// Output: [B, G, R, B, G, R, ...]        (3 bytes/pixel)
pub fn bgra32_to_bgr(src: &[u8], dst: &mut [u8]) {
    for (s, d) in src.chunks_exact(4).zip(dst.chunks_exact_mut(3)) {
        d[0] = s[0]; // B
        d[1] = s[1]; // G
        d[2] = s[2]; // R
                     // s[3] = A, discarded
    }
}

// ─── RGB → BGR ──────────────────────────────────────────────────────────────