WIP: Add support for std::simd

Cargo.toml

@@ -14,6 +14,7 @@ rust-version = "1.61"
 [features]
 default = ["std"]
 simd = ["std"]
+nightly-portable-simd = ["std"]
 std = []
 
 [dependencies]

src/encoder.rs

@@ -453,19 +453,53 @@ impl<W: JfifWrite> Encoder<W> {
             }
         }
 
-        match color_type {
-            ColorType::Luma => self.encode_image(GrayImage(data, width, height))?,
-            ColorType::Rgb => self.encode_image(RgbImage(data, width, height))?,
-            ColorType::Rgba => self.encode_image(RgbaImage(data, width, height))?,
-            ColorType::Bgr => self.encode_image(BgrImage(data, width, height))?,
-            ColorType::Bgra => self.encode_image(BgraImage(data, width, height))?,
-            ColorType::Ycbcr => self.encode_image(YCbCrImage(data, width, height))?,
-            ColorType::Cmyk => self.encode_image(CmykImage(data, width, height))?,
-            ColorType::CmykAsYcck => self.encode_image(CmykAsYcckImage(data, width, height))?,
-            ColorType::Ycck => self.encode_image(YcckImage(data, width, height))?,
+        #[cfg(feature = "nightly-portable-simd")]
+        {
+            use crate::std_simd::*;
+
+            return match color_type {
+                ColorType::Luma => self
+                    .encode_image_internal::<_, StdSimdOperations>(GrayImage(data, width, height)),
+                ColorType::Rgb => self.encode_image_internal::<_, StdSimdOperations>(
+                    RgbImageStdSimd(data, width, height),
+                ),
+                ColorType::Rgba => self.encode_image_internal::<_, StdSimdOperations>(
+                    RgbaImageStdSimd(data, width, height),
+                ),
+                ColorType::Bgr => self.encode_image_internal::<_, StdSimdOperations>(
+                    BgrImageStdSimd(data, width, height),
+                ),
+                ColorType::Bgra => self.encode_image_internal::<_, StdSimdOperations>(
+                    BgraImageStdSimd(data, width, height),
+                ),
+                ColorType::Ycbcr => self.encode_image_internal::<_, StdSimdOperations>(
+                    YCbCrImage(data, width, height),
+                ),
+                ColorType::Cmyk => self
+                    .encode_image_internal::<_, StdSimdOperations>(CmykImage(data, width, height)),
+                ColorType::CmykAsYcck => self.encode_image_internal::<_, StdSimdOperations>(
+                    CmykAsYcckImage(data, width, height),
+                ),
+                ColorType::Ycck => self
+                    .encode_image_internal::<_, StdSimdOperations>(YcckImage(data, width, height)),
+            };
         }
 
-        Ok(())
+        #[cfg(not(feature = "nightly-portable-simd"))]
+        {
+            match color_type {
+                ColorType::Luma => self.encode_image(GrayImage(data, width, height))?,
+                ColorType::Rgb => self.encode_image(RgbImage(data, width, height))?,
+                ColorType::Rgba => self.encode_image(RgbaImage(data, width, height))?,
+                ColorType::Bgr => self.encode_image(BgrImage(data, width, height))?,
+                ColorType::Bgra => self.encode_image(BgraImage(data, width, height))?,
+                ColorType::Ycbcr => self.encode_image(YCbCrImage(data, width, height))?,
+                ColorType::Cmyk => self.encode_image(CmykImage(data, width, height))?,
+                ColorType::CmykAsYcck => self.encode_image(CmykAsYcckImage(data, width, height))?,
+                ColorType::Ycck => self.encode_image(YcckImage(data, width, height))?,
+            }
+            Ok(())
+        }
     }
 
     /// Encode an image

src/lib.rs

@@ -25,6 +25,8 @@
 #![no_std]
 #![cfg_attr(not(feature = "simd"), forbid(unsafe_code))]
 
+#![cfg_attr(feature = "nightly-portable-simd", feature(portable_simd))]
+
 #[cfg(feature = "std")]
 extern crate std;
 
@@ -33,6 +35,10 @@ extern crate core;
 
 #[cfg(all(feature = "simd", any(target_arch = "x86", target_arch = "x86_64")))]
 mod avx2;
+
+#[cfg(feature = "nightly-portable-simd")]
+mod std_simd;
+
 mod encoder;
 mod error;
 mod fdct;

src/std_simd.rs

@@ -0,0 +1,9 @@
+mod ycbcr;
+
+pub(crate) use ycbcr::*;
+use crate::encoder::Operations;
+
+pub(crate) struct StdSimdOperations;
+
+impl Operations for StdSimdOperations {
+}