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Expose zc level 0 (uncompressed) 🚀 (#641)

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Allow the creation of PNGs with uncompressed deflate streams via level 0
of libdeflate. If you want a glorified BMP with delta filters, this
change will make your dreams come true 🙂.
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Galaxy4594 2024-09-04 15:32:28 -07:00 committed by GitHub
parent 0f24120c9a
commit 0d60e8b7c6
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4 changed files with 6 additions and 6 deletions
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2
MANUAL.txt
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@ -132,7 +132,7 @@ Options:
CPU cores. CPU cores.
--zc <level> --zc <level>
Deflate compression level (1-12) for main compression trials. The levels here are defined Deflate compression level (0-12) for main compression trials. The levels here are defined
by the libdeflate compression library. by the libdeflate compression library.
The default value depends on the optimization level preset. The default value depends on the optimization level preset.

6
src/cli.rs
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@ -259,15 +259,15 @@ CPU cores.")
) )
.arg( .arg(
Arg::new("compression") Arg::new("compression")
.help("Deflate compression level (1-12)") .help("Deflate compression level (0-12)")
.long_help("\ .long_help("\
Deflate compression level (1-12) for main compression trials. The levels here are defined \ Deflate compression level (0-12) for main compression trials. The levels here are defined \
by the libdeflate compression library. by the libdeflate compression library.
The default value depends on the optimization level preset.") The default value depends on the optimization level preset.")
.long("zc") .long("zc")
.value_name("level") .value_name("level")
.value_parser(1..=12) .value_parser(0..=12)
.conflicts_with("zopfli"), .conflicts_with("zopfli"),
) )
.arg( .arg(

2
src/deflate/mod.rs
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@ -16,7 +16,7 @@ pub use zopfli_oxipng::deflate as zopfli_deflate;
pub enum Deflaters { pub enum Deflaters {
/// Use libdeflater. /// Use libdeflater.
Libdeflater { Libdeflater {
/// Which compression level to use on the file (1-12) /// Which compression level to use on the file (0-12)
compression: u8, compression: u8,
}, },
#[cfg(feature = "zopfli")] #[cfg(feature = "zopfli")]

2
src/lib.rs
View file

@ -413,7 +413,7 @@ fn optimize_raw(
deadline: Arc<Deadline>, deadline: Arc<Deadline>,
max_size: Option<usize>, max_size: Option<usize>,
) -> Option<PngData> { ) -> Option<PngData> {
// Libdeflate has four algorithms: 1-4 = 'greedy', 5-7 = 'lazy', 8-9 = 'lazy2', 10-12 = 'near-optimal' // Libdeflate has four algorithms: 0 = 'uncompressed', 1-4 = 'greedy', 5-7 = 'lazy', 8-9 = 'lazy2', 10-12 = 'near-optimal'
// 5 is the minimumm required for a decent evaluation result // 5 is the minimumm required for a decent evaluation result
// 7 is not noticeably slower than 5 and improves evaluation of filters in 'fast' mode (o2 and lower) // 7 is not noticeably slower than 5 and improves evaluation of filters in 'fast' mode (o2 and lower)
// 8 is a little slower but not noticeably when used only for reductions (o3 and higher) // 8 is a little slower but not noticeably when used only for reductions (o3 and higher)