Encode runs of 1 as index (+ "reference" feature)
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2 changed files with 21 additions and 5 deletions
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@ -15,6 +15,10 @@ exclude = [
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"assets/*",
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]
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[features]
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default = []
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reference = [] # follows reference encoder implementation precisely, but may be slightly slower
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[dependencies]
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bytemuck = "1.7"
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@ -8,7 +8,7 @@ use crate::pixel::{Pixel, SupportedChannels};
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use crate::types::{Channels, ColorSpace};
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use crate::utils::{unlikely, BytesMut, GenericWriter, Writer};
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#[allow(clippy::cast_possible_truncation)]
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#[allow(clippy::cast_possible_truncation, unused_assignments)]
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fn qoi_encode_impl<W: Writer, const N: usize>(mut buf: W, data: &[u8]) -> Result<usize>
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where
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Pixel<N>: SupportedChannels,
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@ -17,6 +17,7 @@ where
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let mut index = [Pixel::new(); 256];
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let mut px_prev = Pixel::new().with_a(0xff);
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let mut hash_prev = Pixel::<N>::new().with_a(0xff).hash_index();
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let mut run = 0_u8;
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let mut px = Pixel::<N>::new().with_a(0xff);
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@ -32,14 +33,25 @@ where
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}
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} else {
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if run != 0 {
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#[cfg(not(feature = "reference"))]
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{
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buf = buf.write_one(if run == 1 {
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QOI_OP_INDEX | (hash_prev as u8)
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} else {
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QOI_OP_RUN | (run - 1)
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})?;
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}
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#[cfg(feature = "reference")]
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{
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buf = buf.write_one(QOI_OP_RUN | (run - 1))?;
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}
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run = 0;
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}
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let index_pos = px.hash_index();
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let index_px = &mut index[index_pos as usize];
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hash_prev = px.hash_index();
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let index_px = &mut index[hash_prev as usize];
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let px_rgba = px.as_rgba(0xff);
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if *index_px == px_rgba {
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buf = buf.write_one(QOI_OP_INDEX | index_pos)?;
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buf = buf.write_one(QOI_OP_INDEX | hash_prev)?;
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} else {
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*index_px = px_rgba;
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buf = px.encode_into(px_prev, buf)?;
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