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diff --git a/third_party/jpeg-xl/lib/jxl/image_ops.h b/third_party/jpeg-xl/lib/jxl/image_ops.h
new file mode 100644
index 0000000000..b2ce23f13d
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+++ b/third_party/jpeg-xl/lib/jxl/image_ops.h
@@ -0,0 +1,454 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_IMAGE_OPS_H_
+#define LIB_JXL_IMAGE_OPS_H_
+
+// Operations on images.
+
+#include <algorithm>
+#include <array>
+#include <limits>
+#include <vector>
+
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/frame_dimensions.h"
+#include "lib/jxl/image.h"
+
+namespace jxl {
+
+template <typename T>
+void CopyImageTo(const Plane<T>& from, Plane<T>* JXL_RESTRICT to) {
+  JXL_ASSERT(SameSize(from, *to));
+  if (from.ysize() == 0 || from.xsize() == 0) return;
+  for (size_t y = 0; y < from.ysize(); ++y) {
+    const T* JXL_RESTRICT row_from = from.ConstRow(y);
+    T* JXL_RESTRICT row_to = to->Row(y);
+    memcpy(row_to, row_from, from.xsize() * sizeof(T));
+  }
+}
+
+// Copies `from:rect_from` to `to:rect_to`.
+template <typename T>
+void CopyImageTo(const Rect& rect_from, const Plane<T>& from,
+                 const Rect& rect_to, Plane<T>* JXL_RESTRICT to) {
+  JXL_DASSERT(SameSize(rect_from, rect_to));
+  JXL_DASSERT(rect_from.IsInside(from));
+  JXL_DASSERT(rect_to.IsInside(*to));
+  if (rect_from.xsize() == 0) return;
+  for (size_t y = 0; y < rect_from.ysize(); ++y) {
+    const T* JXL_RESTRICT row_from = rect_from.ConstRow(from, y);
+    T* JXL_RESTRICT row_to = rect_to.Row(to, y);
+    memcpy(row_to, row_from, rect_from.xsize() * sizeof(T));
+  }
+}
+
+// Copies `from:rect_from` to `to:rect_to`.
+template <typename T>
+void CopyImageTo(const Rect& rect_from, const Image3<T>& from,
+                 const Rect& rect_to, Image3<T>* JXL_RESTRICT to) {
+  JXL_ASSERT(SameSize(rect_from, rect_to));
+  for (size_t c = 0; c < 3; c++) {
+    CopyImageTo(rect_from, from.Plane(c), rect_to, &to->Plane(c));
+  }
+}
+
+template <typename T, typename U>
+void ConvertPlaneAndClamp(const Rect& rect_from, const Plane<T>& from,
+                          const Rect& rect_to, Plane<U>* JXL_RESTRICT to) {
+  JXL_ASSERT(SameSize(rect_from, rect_to));
+  using M = decltype(T() + U());
+  for (size_t y = 0; y < rect_to.ysize(); ++y) {
+    const T* JXL_RESTRICT row_from = rect_from.ConstRow(from, y);
+    U* JXL_RESTRICT row_to = rect_to.Row(to, y);
+    for (size_t x = 0; x < rect_to.xsize(); ++x) {
+      row_to[x] =
+          std::min<M>(std::max<M>(row_from[x], std::numeric_limits<U>::min()),
+                      std::numeric_limits<U>::max());
+    }
+  }
+}
+
+// Copies `from` to `to`.
+template <typename T>
+void CopyImageTo(const T& from, T* JXL_RESTRICT to) {
+  return CopyImageTo(Rect(from), from, Rect(*to), to);
+}
+
+// Copies `from:rect_from` to `to:rect_to`; also copies `padding` pixels of
+// border around `from:rect_from`, in all directions, whenever they are inside
+// the first image.
+template <typename T>
+void CopyImageToWithPadding(const Rect& from_rect, const T& from,
+                            size_t padding, const Rect& to_rect, T* to) {
+  size_t xextra0 = std::min(padding, from_rect.x0());
+  size_t xextra1 =
+      std::min(padding, from.xsize() - from_rect.x0() - from_rect.xsize());
+  size_t yextra0 = std::min(padding, from_rect.y0());
+  size_t yextra1 =
+      std::min(padding, from.ysize() - from_rect.y0() - from_rect.ysize());
+  JXL_DASSERT(to_rect.x0() >= xextra0);
+  JXL_DASSERT(to_rect.y0() >= yextra0);
+
+  return CopyImageTo(Rect(from_rect.x0() - xextra0, from_rect.y0() - yextra0,
+                          from_rect.xsize() + xextra0 + xextra1,
+                          from_rect.ysize() + yextra0 + yextra1),
+                     from,
+                     Rect(to_rect.x0() - xextra0, to_rect.y0() - yextra0,
+                          to_rect.xsize() + xextra0 + xextra1,
+                          to_rect.ysize() + yextra0 + yextra1),
+                     to);
+}
+
+template <class ImageIn, class ImageOut>
+void Subtract(const ImageIn& image1, const ImageIn& image2, ImageOut* out) {
+  using T = typename ImageIn::T;
+  const size_t xsize = image1.xsize();
+  const size_t ysize = image1.ysize();
+  JXL_CHECK(xsize == image2.xsize());
+  JXL_CHECK(ysize == image2.ysize());
+
+  for (size_t y = 0; y < ysize; ++y) {
+    const T* const JXL_RESTRICT row1 = image1.Row(y);
+    const T* const JXL_RESTRICT row2 = image2.Row(y);
+    T* const JXL_RESTRICT row_out = out->Row(y);
+    for (size_t x = 0; x < xsize; ++x) {
+      row_out[x] = row1[x] - row2[x];
+    }
+  }
+}
+
+// In-place.
+template <typename Tin, typename Tout>
+void SubtractFrom(const Plane<Tin>& what, Plane<Tout>* to) {
+  const size_t xsize = what.xsize();
+  const size_t ysize = what.ysize();
+  for (size_t y = 0; y < ysize; ++y) {
+    const Tin* JXL_RESTRICT row_what = what.ConstRow(y);
+    Tout* JXL_RESTRICT row_to = to->Row(y);
+    for (size_t x = 0; x < xsize; ++x) {
+      row_to[x] -= row_what[x];
+    }
+  }
+}
+
+// In-place.
+template <typename Tin, typename Tout>
+void AddTo(const Plane<Tin>& what, Plane<Tout>* to) {
+  const size_t xsize = what.xsize();
+  const size_t ysize = what.ysize();
+  for (size_t y = 0; y < ysize; ++y) {
+    const Tin* JXL_RESTRICT row_what = what.ConstRow(y);
+    Tout* JXL_RESTRICT row_to = to->Row(y);
+    for (size_t x = 0; x < xsize; ++x) {
+      row_to[x] += row_what[x];
+    }
+  }
+}
+
+template <typename Tin, typename Tout>
+void AddTo(Rect rectFrom, const Plane<Tin>& what, Rect rectTo,
+           Plane<Tout>* to) {
+  JXL_ASSERT(SameSize(rectFrom, rectTo));
+  const size_t xsize = rectTo.xsize();
+  const size_t ysize = rectTo.ysize();
+  for (size_t y = 0; y < ysize; ++y) {
+    const Tin* JXL_RESTRICT row_what = rectFrom.ConstRow(what, y);
+    Tout* JXL_RESTRICT row_to = rectTo.Row(to, y);
+    for (size_t x = 0; x < xsize; ++x) {
+      row_to[x] += row_what[x];
+    }
+  }
+}
+
+// Returns linear combination of two grayscale images.
+template <typename T>
+Plane<T> LinComb(const T lambda1, const Plane<T>& image1, const T lambda2,
+                 const Plane<T>& image2) {
+  const size_t xsize = image1.xsize();
+  const size_t ysize = image1.ysize();
+  JXL_CHECK(xsize == image2.xsize());
+  JXL_CHECK(ysize == image2.ysize());
+  Plane<T> out(xsize, ysize);
+  for (size_t y = 0; y < ysize; ++y) {
+    const T* const JXL_RESTRICT row1 = image1.Row(y);
+    const T* const JXL_RESTRICT row2 = image2.Row(y);
+    T* const JXL_RESTRICT row_out = out.Row(y);
+    for (size_t x = 0; x < xsize; ++x) {
+      row_out[x] = lambda1 * row1[x] + lambda2 * row2[x];
+    }
+  }
+  return out;
+}
+
+// Multiplies image by lambda in-place
+template <typename T>
+void ScaleImage(const T lambda, Plane<T>* image) {
+  for (size_t y = 0; y < image->ysize(); ++y) {
+    T* const JXL_RESTRICT row = image->Row(y);
+    for (size_t x = 0; x < image->xsize(); ++x) {
+      row[x] = lambda * row[x];
+    }
+  }
+}
+
+// Multiplies image by lambda in-place
+template <typename T>
+void ScaleImage(const T lambda, Image3<T>* image) {
+  for (size_t c = 0; c < 3; ++c) {
+    ScaleImage(lambda, &image->Plane(c));
+  }
+}
+
+template <typename T>
+void FillImage(const T value, Plane<T>* image) {
+  for (size_t y = 0; y < image->ysize(); ++y) {
+    T* const JXL_RESTRICT row = image->Row(y);
+    for (size_t x = 0; x < image->xsize(); ++x) {
+      row[x] = value;
+    }
+  }
+}
+
+template <typename T>
+void ZeroFillImage(Plane<T>* image) {
+  if (image->xsize() == 0) return;
+  for (size_t y = 0; y < image->ysize(); ++y) {
+    T* const JXL_RESTRICT row = image->Row(y);
+    memset(row, 0, image->xsize() * sizeof(T));
+  }
+}
+
+// Mirrors out of bounds coordinates and returns valid coordinates unchanged.
+// We assume the radius (distance outside the image) is small compared to the
+// image size, otherwise this might not terminate.
+// The mirror is outside the last column (border pixel is also replicated).
+static inline int64_t Mirror(int64_t x, const int64_t xsize) {
+  JXL_DASSERT(xsize != 0);
+
+  // TODO(janwas): replace with branchless version
+  while (x < 0 || x >= xsize) {
+    if (x < 0) {
+      x = -x - 1;
+    } else {
+      x = 2 * xsize - 1 - x;
+    }
+  }
+  return x;
+}
+
+// Wrap modes for ensuring X/Y coordinates are in the valid range [0, size):
+
+// Mirrors (repeating the edge pixel once). Useful for convolutions.
+struct WrapMirror {
+  JXL_INLINE int64_t operator()(const int64_t coord, const int64_t size) const {
+    return Mirror(coord, size);
+  }
+};
+
+// Returns the same coordinate: required for TFNode with Border(), or useful
+// when we know "coord" is already valid (e.g. interior of an image).
+struct WrapUnchanged {
+  JXL_INLINE int64_t operator()(const int64_t coord, int64_t /*size*/) const {
+    return coord;
+  }
+};
+
+// Similar to Wrap* but for row pointers (reduces Row() multiplications).
+
+class WrapRowMirror {
+ public:
+  template <class ImageOrView>
+  WrapRowMirror(const ImageOrView& image, size_t ysize)
+      : first_row_(image.ConstRow(0)), last_row_(image.ConstRow(ysize - 1)) {}
+
+  const float* operator()(const float* const JXL_RESTRICT row,
+                          const int64_t stride) const {
+    if (row < first_row_) {
+      const int64_t num_before = first_row_ - row;
+      // Mirrored; one row before => row 0, two before = row 1, ...
+      return first_row_ + num_before - stride;
+    }
+    if (row > last_row_) {
+      const int64_t num_after = row - last_row_;
+      // Mirrored; one row after => last row, two after = last - 1, ...
+      return last_row_ - num_after + stride;
+    }
+    return row;
+  }
+
+ private:
+  const float* const JXL_RESTRICT first_row_;
+  const float* const JXL_RESTRICT last_row_;
+};
+
+struct WrapRowUnchanged {
+  JXL_INLINE const float* operator()(const float* const JXL_RESTRICT row,
+                                     int64_t /*stride*/) const {
+    return row;
+  }
+};
+
+// Sets "thickness" pixels on each border to "value". This is faster than
+// initializing the entire image and overwriting valid/interior pixels.
+template <typename T>
+void SetBorder(const size_t thickness, const T value, Plane<T>* image) {
+  const size_t xsize = image->xsize();
+  const size_t ysize = image->ysize();
+  // Top: fill entire row
+  for (size_t y = 0; y < std::min(thickness, ysize); ++y) {
+    T* const JXL_RESTRICT row = image->Row(y);
+    std::fill(row, row + xsize, value);
+  }
+
+  // Bottom: fill entire row
+  for (size_t y = ysize - thickness; y < ysize; ++y) {
+    T* const JXL_RESTRICT row = image->Row(y);
+    std::fill(row, row + xsize, value);
+  }
+
+  // Left/right: fill the 'columns' on either side, but only if the image is
+  // big enough that they don't already belong to the top/bottom rows.
+  if (ysize >= 2 * thickness) {
+    for (size_t y = thickness; y < ysize - thickness; ++y) {
+      T* const JXL_RESTRICT row = image->Row(y);
+      std::fill(row, row + thickness, value);
+      std::fill(row + xsize - thickness, row + xsize, value);
+    }
+  }
+}
+
+// Computes the minimum and maximum pixel value.
+template <typename T>
+void ImageMinMax(const Plane<T>& image, T* const JXL_RESTRICT min,
+                 T* const JXL_RESTRICT max) {
+  *min = std::numeric_limits<T>::max();
+  *max = std::numeric_limits<T>::lowest();
+  for (size_t y = 0; y < image.ysize(); ++y) {
+    const T* const JXL_RESTRICT row = image.Row(y);
+    for (size_t x = 0; x < image.xsize(); ++x) {
+      *min = std::min(*min, row[x]);
+      *max = std::max(*max, row[x]);
+    }
+  }
+}
+
+template <typename T>
+Plane<T> ImageFromPacked(const std::vector<T>& packed, const size_t xsize,
+                         const size_t ysize) {
+  Plane<T> out(xsize, ysize);
+  for (size_t y = 0; y < ysize; ++y) {
+    T* const JXL_RESTRICT row = out.Row(y);
+    const T* const JXL_RESTRICT packed_row = &packed[y * xsize];
+    memcpy(row, packed_row, xsize * sizeof(T));
+  }
+  return out;
+}
+
+template <typename T>
+void Image3Max(const Image3<T>& image, std::array<T, 3>* out_max) {
+  for (size_t c = 0; c < 3; ++c) {
+    T max = std::numeric_limits<T>::min();
+    for (size_t y = 0; y < image.ysize(); ++y) {
+      const T* JXL_RESTRICT row = image.ConstPlaneRow(c, y);
+      for (size_t x = 0; x < image.xsize(); ++x) {
+        max = std::max(max, row[x]);
+      }
+    }
+    (*out_max)[c] = max;
+  }
+}
+
+template <typename T>
+std::vector<T> PackedFromImage(const Plane<T>& image, const Rect& rect) {
+  const size_t xsize = rect.xsize();
+  const size_t ysize = rect.ysize();
+  std::vector<T> packed(xsize * ysize);
+  for (size_t y = 0; y < rect.ysize(); ++y) {
+    memcpy(&packed[y * xsize], rect.ConstRow(image, y), xsize * sizeof(T));
+  }
+  return packed;
+}
+
+template <typename T>
+std::vector<T> PackedFromImage(const Plane<T>& image) {
+  return PackedFromImage(image, Rect(image));
+}
+
+// Initializes all planes to the same "value".
+template <typename T>
+void FillImage(const T value, Image3<T>* image) {
+  for (size_t c = 0; c < 3; ++c) {
+    for (size_t y = 0; y < image->ysize(); ++y) {
+      T* JXL_RESTRICT row = image->PlaneRow(c, y);
+      for (size_t x = 0; x < image->xsize(); ++x) {
+        row[x] = value;
+      }
+    }
+  }
+}
+
+template <typename T>
+void FillPlane(const T value, Plane<T>* image) {
+  for (size_t y = 0; y < image->ysize(); ++y) {
+    T* JXL_RESTRICT row = image->Row(y);
+    for (size_t x = 0; x < image->xsize(); ++x) {
+      row[x] = value;
+    }
+  }
+}
+
+template <typename T>
+void FillImage(const T value, Image3<T>* image, Rect rect) {
+  for (size_t c = 0; c < 3; ++c) {
+    for (size_t y = 0; y < rect.ysize(); ++y) {
+      T* JXL_RESTRICT row = rect.PlaneRow(image, c, y);
+      for (size_t x = 0; x < rect.xsize(); ++x) {
+        row[x] = value;
+      }
+    }
+  }
+}
+
+template <typename T>
+void FillPlane(const T value, Plane<T>* image, Rect rect) {
+  for (size_t y = 0; y < rect.ysize(); ++y) {
+    T* JXL_RESTRICT row = rect.Row(image, y);
+    for (size_t x = 0; x < rect.xsize(); ++x) {
+      row[x] = value;
+    }
+  }
+}
+
+template <typename T>
+void ZeroFillImage(Image3<T>* image) {
+  for (size_t c = 0; c < 3; ++c) {
+    for (size_t y = 0; y < image->ysize(); ++y) {
+      T* JXL_RESTRICT row = image->PlaneRow(c, y);
+      if (image->xsize() != 0) memset(row, 0, image->xsize() * sizeof(T));
+    }
+  }
+}
+
+template <typename T>
+void ZeroFillPlane(Plane<T>* image, Rect rect) {
+  for (size_t y = 0; y < rect.ysize(); ++y) {
+    T* JXL_RESTRICT row = rect.Row(image, y);
+    memset(row, 0, rect.xsize() * sizeof(T));
+  }
+}
+
+// Same as above, but operates in-place. Assumes that the `in` image was
+// allocated large enough.
+void PadImageToBlockMultipleInPlace(Image3F* JXL_RESTRICT in,
+                                    size_t block_dim = kBlockDim);
+
+// Downsamples an image by a given factor.
+void DownsampleImage(Image3F* opsin, size_t factor);
+void DownsampleImage(ImageF* image, size_t factor);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_IMAGE_OPS_H_