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Make vertical blur parallel.

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This commit is contained in:
mindv0rtex 2021-02-26 15:52:17 -05:00
parent 4e9778bffc
commit cf35e041dd
1 changed files with 7 additions and 6 deletions
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9
src/blur.rs
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@ -100,18 +100,19 @@ impl Blur {
} }
} }
// The outer loop cannot be parallelized because we need to use the buffer sequentially.
for (i, dst_row) in dst.chunks_exact_mut(width).enumerate() { for (i, dst_row) in dst.chunks_exact_mut(width).enumerate() {
let bottom_off = ((i + height - radius - 1) & (height - 1)) * width; let bottom_off = ((i + height - radius - 1) & (height - 1)) * width;
let bottom_row = &src[bottom_off..bottom_off + width]; let bottom_row = &src[bottom_off..bottom_off + width];
let top_off = ((i + radius) & (height - 1)) * width; let top_off = ((i + radius) & (height - 1)) * width;
let top_row = &src[top_off..top_off + width]; let top_row = &src[top_off..top_off + width];
for (dst, buf, bottom, top) in (dst_row, &mut self.row_buffer, bottom_row, top_row)
multizip((dst_row, &mut self.row_buffer, bottom_row, top_row)) .into_par_iter()
{ .for_each(|(dst, buf, bottom, top)| {
*buf += top - bottom; *buf += top - bottom;
*dst = *buf * weight; *dst = *buf * weight;
} });
} }
} }
} }