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diff --git a/third_party/jpeg-xl/lib/jxl/render_pipeline/simple_render_pipeline.h b/third_party/jpeg-xl/lib/jxl/render_pipeline/simple_render_pipeline.h
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+++ b/third_party/jpeg-xl/lib/jxl/render_pipeline/simple_render_pipeline.h
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+// 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_RENDER_PIPELINE_SIMPLE_RENDER_PIPELINE_H_
+#define LIB_JXL_RENDER_PIPELINE_SIMPLE_RENDER_PIPELINE_H_
+
+#include <stdint.h>
+
+#include "lib/jxl/render_pipeline/render_pipeline.h"
+
+namespace jxl {
+
+// A RenderPipeline that is "obviously correct"; it may use potentially large
+// amounts of memory and be slow. It is intended to be used mostly for testing
+// purposes.
+class SimpleRenderPipeline : public RenderPipeline {
+  std::vector<std::pair<ImageF*, Rect>> PrepareBuffers(
+      size_t group_id, size_t thread_id) override;
+
+  void ProcessBuffers(size_t group_id, size_t thread_id) override;
+
+  void PrepareForThreadsInternal(size_t num, bool use_group_ids) override;
+
+  // Full frame buffers. Both X and Y dimensions are padded by
+  // kRenderPipelineXOffset.
+  std::vector<ImageF> channel_data_;
+  size_t processed_passes_ = 0;
+
+ private:
+  Rect MakeChannelRect(size_t group_id, size_t channel);
+};
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_RENDER_PIPELINE_SIMPLE_RENDER_PIPELINE_H_