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aa_coverage_span

rasterrocket_render::simd::aa_coverage

Function aa_coverage_span 

Source 
pub fn aa_coverage_span(rows: [&[u8]; 4], x0: usize, shape: &mut [u8])
Expand description

Fill shape[i] with the AA coverage count (0..=16) for output pixel x0 + i.

rows are the four AaBuf sub-row byte slices, each of length (bitmap_width * AA_SIZE + 7) / 8.

§Preconditions

  • x0 + shape.len() ≤ bitmap_width — span must not exceed the bitmap row.
  • x0 should be even for the SIMD tiers to be used. An odd x0 is correctly handled by the scalar tier (full precision, lower throughput).

§Panics

Panics if any row slice is shorter than required by the span — i.e. if the x0 + shape.len() ≤ bitmap_width precondition is violated.