Introduce a simpler cache dedicated to just decode JPEGs (#1550)

* New cache for decoded tensors

* Use the tensor_decode_cache

* Actually track/purge the decode cache

* At least log warning if the image can't be decoded

* Pull in the zero-copy deserialization for ArrowBinary

* Bump up decode cache to 4G on non-wasm targets

crates/re_log_types/src/component_types/arrow_convert_shims.rs

@@ -0,0 +1,107 @@
+//! Assorted shims that should make their way back to [arrow2-convert](https://github.com/DataEngineeringLabs/arrow2-convert/)
+
+use std::ops::Index;
+
+use arrow2::{
+    array::{Array, BinaryArray},
+    buffer::Buffer,
+};
+use arrow2_convert::{
+    deserialize::{ArrowArray, ArrowDeserialize},
+    ArrowField, ArrowSerialize,
+};
+
+/// Shim to enable zero-copy arrow deserialization for `Buffer<u8>`
+/// Can be removed when: [arrow2-convert#103](https://github.com/DataEngineeringLabs/arrow2-convert/pull/103) lands
+#[derive(Clone, Debug, PartialEq, ArrowField, ArrowSerialize)]
+#[arrow_field(transparent)]
+pub struct BinaryBuffer(pub Buffer<u8>);
+
+impl BinaryBuffer {
+    pub fn as_slice(&self) -> &[u8] {
+        self.0.as_slice()
+    }
+}
+
+impl Index<usize> for BinaryBuffer {
+    type Output = u8;
+    fn index(&self, i: usize) -> &u8 {
+        &self.0[i]
+    }
+}
+
+impl From<Vec<u8>> for BinaryBuffer {
+    fn from(v: Vec<u8>) -> Self {
+        Self(v.into())
+    }
+}
+
+/// Iterator for for [`BufferBinaryArray`]
+pub struct BufferBinaryArrayIter<'a> {
+    index: usize,
+    array: &'a BinaryArray<i32>,
+}
+
+impl<'a> Iterator for BufferBinaryArrayIter<'a> {
+    type Item = Option<Buffer<u8>>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.index >= self.array.len() {
+            None
+        } else {
+            if let Some(validity) = self.array.validity() {
+                if !validity.get_bit(self.index) {
+                    self.index += 1;
+                    return Some(None);
+                }
+            }
+            let (start, end) = self.array.offsets().start_end(self.index);
+            self.index += 1;
+            Some(Some(self.array.values().clone().slice(start, end - start)))
+        }
+    }
+}
+
+/// Internal `ArrowArray` helper to iterate over a `BinaryArray` while exposing Buffer slices
+pub struct BufferBinaryArray;
+
+extern "C" {
+    fn do_not_call_into_iter(); // we never define this function, so the linker will fail
+}
+
+impl<'a> IntoIterator for &'a BufferBinaryArray {
+    type Item = Option<Buffer<u8>>;
+
+    type IntoIter = BufferBinaryArrayIter<'a>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        #[allow(unsafe_code)]
+        // SAFETY:
+        // This exists so we get a link-error if some code tries to call into_iter
+        // Iteration should only happen via iter_from_array_ref.
+        // This is a quirk of the way the traits work in arrow2_convert.
+        unsafe {
+            do_not_call_into_iter();
+        }
+        unreachable!()
+    }
+}
+
+impl ArrowArray for BufferBinaryArray {
+    type BaseArrayType = BinaryArray<i32>;
+    #[inline]
+    fn iter_from_array_ref(a: &dyn Array) -> <&Self as IntoIterator>::IntoIter {
+        let b = a.as_any().downcast_ref::<Self::BaseArrayType>().unwrap();
+
+        BufferBinaryArrayIter { index: 0, array: b }
+    }
+}
+
+impl ArrowDeserialize for BinaryBuffer {
+    type ArrayType = BufferBinaryArray;
+
+    #[inline]
+    fn arrow_deserialize(v: Option<Buffer<u8>>) -> Option<Self> {
+        v.map(BinaryBuffer)
+    }
+}

crates/re_log_types/src/component_types/mod.rs

@@ -17,6 +17,7 @@ use lazy_static::lazy_static;
 use crate::msg_bundle::Component;
 
 mod arrow;
+mod arrow_convert_shims;
 mod bbox;
 mod class_id;
 mod color;
@@ -59,6 +60,8 @@ pub use radius::Radius;
 pub use rect::Rect2D;
 pub use scalar::{Scalar, ScalarPlotProps};
 pub use size::Size3D;
+#[cfg(feature = "image")]
+pub use tensor::TensorImageError;
 pub use tensor::{
     Tensor, TensorCastError, TensorData, TensorDataMeaning, TensorDimension, TensorId, TensorTrait,
 };

crates/re_log_types/src/component_types/tensor.rs

@@ -7,6 +7,8 @@ use arrow2_convert::{serialize::ArrowSerialize, ArrowDeserialize, ArrowField, Ar
 use crate::msg_bundle::Component;
 use crate::{TensorDataType, TensorElement};
 
+use super::arrow_convert_shims::BinaryBuffer;
+
 pub trait TensorTrait {
     fn id(&self) -> TensorId;
     fn shape(&self) -> &[TensorDimension];
@@ -16,6 +18,7 @@ pub trait TensorTrait {
     fn meaning(&self) -> TensorDataMeaning;
     fn get(&self, index: &[u64]) -> Option<TensorElement>;
     fn dtype(&self) -> TensorDataType;
+    fn size_in_bytes(&self) -> usize;
 }
 
 // ----------------------------------------------------------------------------
@@ -154,7 +157,7 @@ impl ArrowDeserialize for TensorId {
 #[derive(Clone, Debug, PartialEq, ArrowField, ArrowSerialize, ArrowDeserialize)]
 #[arrow_field(type = "dense")]
 pub enum TensorData {
-    U8(Vec<u8>),
+    U8(BinaryBuffer),
     U16(Buffer<u16>),
     U32(Buffer<u32>),
     U64(Buffer<u64>),
@@ -168,7 +171,7 @@ pub enum TensorData {
     //F16(Vec<arrow2::types::f16>),
     F32(Buffer<f32>),
     F64(Buffer<f64>),
-    JPEG(Vec<u8>),
+    JPEG(BinaryBuffer),
 }
 
 /// Flattened `Tensor` data payload
@@ -404,6 +407,21 @@ impl TensorTrait for Tensor {
             TensorData::F64(_) => TensorDataType::F64,
         }
     }
+
+    fn size_in_bytes(&self) -> usize {
+        match &self.data {
+            TensorData::U8(buf) | TensorData::JPEG(buf) => buf.0.len(),
+            TensorData::U16(buf) => buf.len(),
+            TensorData::U32(buf) => buf.len(),
+            TensorData::U64(buf) => buf.len(),
+            TensorData::I8(buf) => buf.len(),
+            TensorData::I16(buf) => buf.len(),
+            TensorData::I32(buf) => buf.len(),
+            TensorData::I64(buf) => buf.len(),
+            TensorData::F32(buf) => buf.len(),
+            TensorData::F64(buf) => buf.len(),
+        }
+    }
 }
 
 impl Component for Tensor {
@@ -535,7 +553,7 @@ impl<'a> TryFrom<&'a Tensor> for ::ndarray::ArrayViewD<'a, half::f16> {
 
 #[cfg(feature = "image")]
 #[derive(thiserror::Error, Debug)]
-pub enum ImageError {
+pub enum TensorImageError {
     #[error(transparent)]
     Image(#[from] image::ImageError),
 
@@ -575,20 +593,22 @@ impl Tensor {
     #[cfg(not(target_arch = "wasm32"))]
     pub fn tensor_from_jpeg_file(
         image_path: impl AsRef<std::path::Path>,
-    ) -> Result<Self, ImageError> {
+    ) -> Result<Self, TensorImageError> {
         let jpeg_bytes = std::fs::read(image_path)?;
         Self::tensor_from_jpeg_bytes(jpeg_bytes)
     }
 
     /// Construct a tensor from the contents of a JPEG file.
     ///
     /// Requires the `image` feature.
-    pub fn tensor_from_jpeg_bytes(jpeg_bytes: Vec<u8>) -> Result<Self, ImageError> {
+    pub fn tensor_from_jpeg_bytes(jpeg_bytes: Vec<u8>) -> Result<Self, TensorImageError> {
         use image::ImageDecoder as _;
         let jpeg = image::codecs::jpeg::JpegDecoder::new(std::io::Cursor::new(&jpeg_bytes))?;
         if jpeg.color_type() != image::ColorType::Rgb8 {
             // TODO(emilk): support gray-scale jpeg as well
-            return Err(ImageError::UnsupportedJpegColorType(jpeg.color_type()));
+            return Err(TensorImageError::UnsupportedJpegColorType(
+                jpeg.color_type(),
+            ));
         }
         let (w, h) = jpeg.dimensions();
 
@@ -599,7 +619,7 @@ impl Tensor {
                 TensorDimension::width(w as _),
                 TensorDimension::depth(3),
             ],
-            data: TensorData::JPEG(jpeg_bytes),
+            data: TensorData::JPEG(jpeg_bytes.into()),
             meaning: TensorDataMeaning::Unknown,
             meter: None,
         })
@@ -608,20 +628,20 @@ impl Tensor {
     /// Construct a tensor from something that can be turned into a [`image::DynamicImage`].
     ///
     /// Requires the `image` feature.
-    pub fn from_image(image: impl Into<image::DynamicImage>) -> Result<Self, ImageError> {
+    pub fn from_image(image: impl Into<image::DynamicImage>) -> Result<Self, TensorImageError> {
         Self::from_dynamic_image(image.into())
     }
 
     /// Construct a tensor from [`image::DynamicImage`].
     ///
     /// Requires the `image` feature.
-    pub fn from_dynamic_image(image: image::DynamicImage) -> Result<Self, ImageError> {
+    pub fn from_dynamic_image(image: image::DynamicImage) -> Result<Self, TensorImageError> {
         let (w, h) = (image.width(), image.height());
 
         let (depth, data) = match image {
-            image::DynamicImage::ImageLuma8(image) => (1, TensorData::U8(image.into_raw())),
-            image::DynamicImage::ImageRgb8(image) => (3, TensorData::U8(image.into_raw())),
-            image::DynamicImage::ImageRgba8(image) => (4, TensorData::U8(image.into_raw())),
+            image::DynamicImage::ImageLuma8(image) => (1, TensorData::U8(image.into_raw().into())),
+            image::DynamicImage::ImageRgb8(image) => (3, TensorData::U8(image.into_raw().into())),
+            image::DynamicImage::ImageRgba8(image) => (4, TensorData::U8(image.into_raw().into())),
             image::DynamicImage::ImageLuma16(image) => {
                 (1, TensorData::U16(image.into_raw().into()))
             }
@@ -649,7 +669,7 @@ impl Tensor {
             }
             _ => {
                 // It is very annoying that DynamicImage is #[non_exhaustive]
-                return Err(ImageError::UnsupportedImageColorType(image.color()));
+                return Err(TensorImageError::UnsupportedImageColorType(image.color()));
             }
         };
 
@@ -741,7 +761,7 @@ fn test_concat_and_slice() {
             size: 4,
             name: None,
         }],
-        data: TensorData::JPEG(vec![1, 2, 3, 4]),
+        data: TensorData::JPEG(vec![1, 2, 3, 4].into()),
         meaning: TensorDataMeaning::Unknown,
         meter: Some(1000.0),
     }];
@@ -752,7 +772,7 @@ fn test_concat_and_slice() {
             size: 4,
             name: None,
         }],
-        data: TensorData::JPEG(vec![5, 6, 7, 8]),
+        data: TensorData::JPEG(vec![5, 6, 7, 8].into()),
         meaning: TensorDataMeaning::Unknown,
         meter: None,
     }];

crates/re_tensor_ops/tests/tensor_tests.rs

@@ -11,7 +11,7 @@ fn convert_tensor_to_ndarray_u8() {
             TensorDimension::unnamed(4),
             TensorDimension::unnamed(5),
         ],
-        TensorData::U8(vec![0; 60]),
+        TensorData::U8(vec![0; 60].into()),
         TensorDataMeaning::Unknown,
         None,
     );
@@ -130,7 +130,7 @@ fn check_tensor_shape_error() {
             TensorDimension::unnamed(4),
             TensorDimension::unnamed(5),
         ],
-        TensorData::U8(vec![0; 59]),
+        TensorData::U8(vec![0; 59].into()),
         TensorDataMeaning::Unknown,
         None,
     );

crates/re_viewer/Cargo.toml

@@ -45,6 +45,7 @@ re_log.workspace = true
 re_log_types = { workspace = true, features = [
   "ecolor",
   "glam",
+  "image",
   "save",
   "load",
 ] }
@@ -99,6 +100,7 @@ serde = { version = "1", features = ["derive"] }
 slotmap = { version = "1.0.6", features = ["serde"] }
 smallvec = { version = "1.10", features = ["serde"] }
 time = { workspace = true, default-features = false, features = ["formatting"] }
+thiserror.workspace = true
 uuid = { version = "1.1", features = ["serde", "v4", "js"] }
 vec1 = "1.8"
 wgpu.workspace = true

crates/re_viewer/src/app.rs

@@ -457,7 +457,7 @@ impl eframe::App for App {
 
         self.purge_memory_if_needed();
 
-        self.state.cache.new_frame();
+        self.state.cache.begin_frame();
 
         self.receive_messages(egui_ctx);
 

crates/re_viewer/src/misc/caches/mod.rs

@@ -1,4 +1,5 @@
 mod mesh_cache;
+mod tensor_decode_cache;
 mod tensor_image_cache;
 
 use re_log_types::component_types::{self, TensorTrait};
@@ -9,6 +10,7 @@ pub use tensor_image_cache::{AsDynamicImage, TensorImageView};
 pub struct Caches {
     /// For displaying images efficiently in immediate mode.
     pub image: tensor_image_cache::ImageCache,
+    pub decode: tensor_decode_cache::DecodeCache,
 
     /// For displaying meshes efficiently in immediate mode.
     pub mesh: mesh_cache::MeshCache,
@@ -18,18 +20,28 @@ pub struct Caches {
 
 impl Caches {
     /// Call once per frame to potentially flush the cache(s).
-    pub fn new_frame(&mut self) {
+    pub fn begin_frame(&mut self) {
         let max_image_cache_use = 1_000_000_000;
-        self.image.new_frame(max_image_cache_use);
+
+        #[cfg(not(target_arch = "wasm32"))]
+        let max_decode_cache_use = 4_000_000_000;
+
+        #[cfg(target_arch = "wasm32")]
+        let max_decode_cache_use = 1_000_000_000;
+
+        self.image.begin_frame(max_image_cache_use);
+        self.decode.begin_frame(max_decode_cache_use);
     }
 
     pub fn purge_memory(&mut self) {
         let Self {
             image,
+            decode,
             tensor_stats,
             mesh: _, // TODO(emilk)
         } = self;
         image.purge_memory();
+        decode.purge_memory();
         tensor_stats.clear();
     }