Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/blenlib/intern/compression.cc

@@ -0,0 +1,44 @@
+/* SPDX-FileCopyrightText: 2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup bli
+ */
+
+#include "BLI_compression.hh"
+
+namespace blender {
+
+void filter_transpose_delta(const uint8_t *src, uint8_t *dst, size_t items_num, size_t item_size)
+{
+  for (size_t ib = 0; ib < item_size; ib++) {
+    uint8_t prev = 0;
+    const uint8_t *src_ptr = src + ib;
+    size_t it = 0;
+    for (; it < items_num; it++) {
+      uint8_t v = *src_ptr;
+      *dst = v - prev;
+      prev = v;
+      src_ptr += item_size;
+      dst += 1;
+    }
+  }
+}
+
+void unfilter_transpose_delta(const uint8_t *src, uint8_t *dst, size_t items_num, size_t item_size)
+{
+  for (size_t ib = 0; ib < item_size; ib++) {
+    uint8_t prev = 0;
+    uint8_t *dst_ptr = dst + ib;
+    for (size_t it = 0; it < items_num; it++) {
+      uint8_t v = *src + prev;
+      prev = v;
+      *dst_ptr = v;
+      src += 1;
+      dst_ptr += item_size;
+    }
+  }
+}
+
+}  // namespace blender