Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/blenlib/BLI_compression.hh

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+/* SPDX-FileCopyrightText: 2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+/** \file
+ * \ingroup bli
+ *
+ * Utilities for lossless data compression.
+ */
+
+#include <cstddef>
+#include <cstdint>
+
+namespace blender {
+
+/**
+ * Transforms array of data, making it more compressible,
+ * especially if data is smoothly varying. Typically you do
+ * this before compression with a general purpose compressor.
+ *
+ * Transposes input array so that output data is first byte of
+ * all items, then 2nd byte of all items, etc. And successive
+ * items within each "byte stream" are stored as difference
+ * from previous byte.
+ *
+ * See https://aras-p.info/blog/2023/03/01/Float-Compression-7-More-Filtering-Optimization/
+ * for details.
+ */
+void filter_transpose_delta(const uint8_t *src, uint8_t *dst, size_t items_num, size_t item_size);
+
+/**
+ * Reverses the data transform done by #unfilter_transpose_delta.
+ * Typically you do this after decompression with a general purpose
+ * compressor.
+ */
+void unfilter_transpose_delta(const uint8_t *src,
+                              uint8_t *dst,
+                              size_t items_num,
+                              size_t item_size);
+
+}  // namespace blender