Reformat and fix warnings

benches/zopfli.rs

@@ -9,12 +9,7 @@ use std::num::NonZeroU8;
 use std::path::PathBuf;
 use test::Bencher;
 
-
-const DEFAULT_DEFLATER: BufferedZopfliDeflater = BufferedZopfliDeflater::new(
-    // SAFETY: trivially safe. Stopgap solution until const unwrap is stabilized.
-    unsafe { NonZeroU8::new_unchecked(15) },
-    4 * 1024 * 1024
-);
+const DEFAULT_DEFLATER: BufferedZopfliDeflater = BufferedZopfliDeflater::const_default();
 
 #[bench]
 fn zopfli_16_bits_strategy_0(b: &mut Bencher) {
@@ -23,7 +18,9 @@ fn zopfli_16_bits_strategy_0(b: &mut Bencher) {
     let max_size = AtomicMin::new(Some(png.idat_data.len()));
 
     b.iter(|| {
-        DEFAULT_DEFLATER.deflate(png.raw.data.as_ref(), &max_size).ok();
+        DEFAULT_DEFLATER
+            .deflate(png.raw.data.as_ref(), &max_size)
+            .ok();
     });
 }
 
@@ -34,7 +31,9 @@ fn zopfli_8_bits_strategy_0(b: &mut Bencher) {
     let max_size = AtomicMin::new(Some(png.idat_data.len()));
 
     b.iter(|| {
-        DEFAULT_DEFLATER.deflate(png.raw.data.as_ref(), &max_size).ok();
+        DEFAULT_DEFLATER
+            .deflate(png.raw.data.as_ref(), &max_size)
+            .ok();
     });
 }
 
@@ -47,7 +46,9 @@ fn zopfli_4_bits_strategy_0(b: &mut Bencher) {
     let max_size = AtomicMin::new(Some(png.idat_data.len()));
 
     b.iter(|| {
-        DEFAULT_DEFLATER.deflate(png.raw.data.as_ref(), &max_size).ok();
+        DEFAULT_DEFLATER
+            .deflate(png.raw.data.as_ref(), &max_size)
+            .ok();
     });
 }
 
@@ -60,7 +61,9 @@ fn zopfli_2_bits_strategy_0(b: &mut Bencher) {
     let max_size = AtomicMin::new(Some(png.idat_data.len()));
 
     b.iter(|| {
-        DEFAULT_DEFLATER.deflate(png.raw.data.as_ref(), &max_size).ok();
+        DEFAULT_DEFLATER
+            .deflate(png.raw.data.as_ref(), &max_size)
+            .ok();
     });
 }
 
@@ -73,6 +76,8 @@ fn zopfli_1_bits_strategy_0(b: &mut Bencher) {
     let max_size = AtomicMin::new(Some(png.idat_data.len()));
 
     b.iter(|| {
-        DEFAULT_DEFLATER.deflate(png.raw.data.as_ref(), &max_size).ok();
+        DEFAULT_DEFLATER
+            .deflate(png.raw.data.as_ref(), &max_size)
+            .ok();
     });
 }

src/deflate/mod.rs

@@ -4,8 +4,8 @@ use crate::{PngError, PngResult};
 pub use deflater::crc32;
 pub use deflater::deflate;
 pub use deflater::inflate;
-use std::{fmt, fmt::Display, io};
 use std::io::{BufWriter, Cursor, Write};
+use std::{fmt, fmt::Display, io};
 
 #[cfg(feature = "zopfli")]
 use std::num::NonZeroU8;
@@ -61,29 +61,60 @@ pub struct BufferedZopfliDeflater {
     iterations: NonZeroU8,
     input_buffer_size: usize,
     output_buffer_size: usize,
-    max_block_splits: u16
+    max_block_splits: u16,
 }
 
+#[cfg(feature = "zopfli")]
 impl BufferedZopfliDeflater {
-    pub const fn new(iterations: NonZeroU8,
-                 input_buffer_size: usize,
-                 output_buffer_size: usize,
-                 max_block_splits: u16) -> Self {
-        BufferedZopfliDeflater {iterations, input_buffer_size, output_buffer_size, max_block_splits }
+    pub const fn new(
+        iterations: NonZeroU8,
+        input_buffer_size: usize,
+        output_buffer_size: usize,
+        max_block_splits: u16,
+    ) -> Self {
+        BufferedZopfliDeflater {
+            iterations,
+            input_buffer_size,
+            output_buffer_size,
+            max_block_splits,
+        }
+    }
+
+    pub const fn const_default() -> Self {
+        BufferedZopfliDeflater {
+            // SAFETY: trivially safe. Stopgap solution until const unwrap is stabilized.
+            iterations: unsafe { NonZeroU8::new_unchecked(15) },
+            input_buffer_size: 1024 * 1024,
+            output_buffer_size: 64 * 1024,
+            max_block_splits: 15,
+        }
+    }
+}
+
+#[cfg(feature = "zopfli")]
+impl Default for BufferedZopfliDeflater {
+    fn default() -> Self {
+        Self::const_default()
     }
 }
 
 #[cfg(feature = "zopfli")]
 impl Deflater for BufferedZopfliDeflater {
     fn deflate(&self, data: &[u8], max_size: &AtomicMin) -> PngResult<Vec<u8>> {
+        #[allow(clippy::needless_update)]
         let options = Options {
             iteration_count: self.iterations,
             maximum_block_splits: self.max_block_splits,
-            ..Default::default()
+            ..Default::default() // for forward compatibility
         };
-        let mut buffer = BufWriter::with_capacity(self.input_buffer_size,
-                                                  DeflateEncoder::new(
-            options, Default::default(), Cursor::new(Vec::new())));
+        let mut buffer = BufWriter::with_capacity(
+            self.input_buffer_size,
+            DeflateEncoder::new(
+                options,
+                Default::default(),
+                Cursor::new(Vec::with_capacity(self.output_buffer_size)),
+            ),
+        );
         let result = (|| -> io::Result<Vec<u8>> {
             buffer.write_all(data)?;
             Ok(buffer.into_inner()?.finish()?.into_inner())

src/headers.rs

@@ -1,5 +1,5 @@
 use crate::colors::{BitDepth, ColorType};
-use crate::deflate::{crc32, Deflater, inflate};
+use crate::deflate::{crc32, inflate, Deflater};
 use crate::error::PngError;
 use crate::interlace::Interlacing;
 use crate::AtomicMin;

src/lib.rs

@@ -41,6 +41,7 @@ use std::sync::Arc;
 use std::time::{Duration, Instant};
 
 pub use crate::colors::{BitDepth, ColorType};
+use crate::deflate::Deflater;
 pub use crate::deflate::Deflaters;
 pub use crate::error::PngError;
 pub use crate::filters::RowFilter;
@@ -48,7 +49,6 @@ pub use crate::headers::StripChunks;
 pub use crate::interlace::Interlacing;
 pub use indexmap::{indexset, IndexSet};
 pub use rgb::{RGB16, RGBA8};
-use crate::deflate::Deflater;
 
 mod atomicmin;
 mod colors;
@@ -387,11 +387,13 @@ impl RawImage {
     }
 
     /// Create an optimized png from the raw image data using the options provided
-    pub fn create_optimized_png<T: Deflater>
-            (&self, opts: &Options, deflater: &T) -> PngResult<Vec<u8>> {
+    pub fn create_optimized_png<T: Deflater>(
+        &self,
+        opts: &Options,
+        deflater: &T,
+    ) -> PngResult<Vec<u8>> {
         let deadline = Arc::new(Deadline::new(opts.timeout));
-        let mut png = optimize_raw(self.png.clone(),
-                                   opts, deadline, None, deflater)
+        let mut png = optimize_raw(self.png.clone(), opts, deadline, None, deflater)
             .ok_or_else(|| PngError::new("Failed to optimize input data"))?;
 
         // Process aux chunks
@@ -572,8 +574,7 @@ fn optimize_png(
     } else {
         Some(png.estimated_output_size())
     };
-    if let Some(new_png) = optimize_raw(raw.clone(), opts, deadline, max_size,
-            &opts.deflate) {
+    if let Some(new_png) = optimize_raw(raw.clone(), opts, deadline, max_size, &opts.deflate) {
         png.raw = new_png.raw;
         png.idat_data = new_png.idat_data;
     }
@@ -623,7 +624,7 @@ fn optimize_raw<T: Deflater>(
     opts: &Options,
     deadline: Arc<Deadline>,
     max_size: Option<usize>,
-    deflater: &T
+    deflater: &T,
 ) -> Option<PngData> {
     // Must use normal (lazy) compression, as faster ones (greedy) are not representative
     let eval_compression = 5;
@@ -765,7 +766,7 @@ fn perform_trial<T: Deflater>(
     opts: &Options,
     filter: RowFilter,
     best_size: &AtomicMin,
-    deflater: &T
+    deflater: &T,
 ) -> Option<TrialResult> {
     let result = deflater.deflate(filtered, best_size);
     match result {
@@ -782,11 +783,11 @@ fn perform_trial<T: Deflater>(
         }
         Err(PngError::DeflatedDataTooLong(bytes)) => {
             trace!(
-                    "    zc = {}  f = {:8} >{} bytes",
-                    opts.deflate,
-                    filter,
-                    bytes,
-                );
+                "    zc = {}  f = {:8} >{} bytes",
+                opts.deflate,
+                filter,
+                bytes,
+            );
             None
         }
         Err(e) => {