Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/blenlib/BLI_memarena.h

@@ -0,0 +1,77 @@
+/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup bli
+ */
+
+#pragma once
+
+#include <cstddef>
+
+#include "BLI_compiler_attrs.h"
+
+#include "MEM_guardedalloc.h"
+
+namespace blender {
+
+/**
+ * A reasonable standard buffer size, big enough to not cause much internal fragmentation,
+ * small enough not to waste resources
+ */
+#define BLI_MEMARENA_STD_BUFSIZE MEM_SIZE_OPTIMAL(1 << 14)
+
+struct MemArena;
+
+MemArena *BLI_memarena_new(size_t bufsize,
+                           const char *name) ATTR_WARN_UNUSED_RESULT ATTR_RETURNS_NONNULL
+    ATTR_NONNULL(2) ATTR_MALLOC;
+void BLI_memarena_free(MemArena *ma) ATTR_NONNULL(1);
+void BLI_memarena_use_malloc(MemArena *ma) ATTR_NONNULL(1);
+void BLI_memarena_use_calloc(MemArena *ma) ATTR_NONNULL(1);
+void BLI_memarena_use_align(MemArena *ma, size_t align) ATTR_NONNULL(1);
+void *BLI_memarena_alloc(MemArena *ma, size_t size) ATTR_WARN_UNUSED_RESULT
+    ATTR_NONNULL(1) ATTR_MALLOC ATTR_ALLOC_SIZE(2);
+void *BLI_memarena_calloc(MemArena *ma, size_t size) ATTR_WARN_UNUSED_RESULT
+    ATTR_NONNULL(1) ATTR_MALLOC ATTR_ALLOC_SIZE(2);
+
+/**
+ * C++ templates for convenience.
+ */
+template<typename T>
+ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1) ATTR_MALLOC T *BLI_memarena_alloc(MemArena *ma,
+                                                                          const size_t num = 1)
+{
+  static_assert(std::is_trivial_v<T>,
+                "Only trivial types may be allocated with BLI_memarena_alloc");
+  return static_cast<T *>(BLI_memarena_alloc(ma, sizeof(T) * num));
+}
+template<typename T>
+ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1) ATTR_MALLOC T *BLI_memarena_calloc(MemArena *ma,
+                                                                           const size_t num = 1)
+{
+  static_assert(std::is_trivial_v<T>,
+                "Only trivial types may be allocated with BLI_memarena_calloc");
+  return static_cast<T *>(BLI_memarena_calloc(ma, sizeof(T) * num));
+}
+
+/**
+ * Transfer ownership of allocated blocks from `ma_src` into `ma_dst`,
+ * cleaning the contents of `ma_src`.
+ *
+ * \note Useful for multi-threaded tasks that need a thread-local #MemArena
+ * that is kept after the multi-threaded operation is completed.
+ *
+ * \note Avoid accumulating memory pools where possible
+ * as any unused memory in `ma_src` is wasted every merge.
+ */
+void BLI_memarena_merge(MemArena *ma_dst, MemArena *ma_src) ATTR_NONNULL(1, 2);
+
+/**
+ * Clear for reuse, avoids re-allocation when an arena may
+ * otherwise be freed and recreated.
+ */
+void BLI_memarena_clear(MemArena *ma) ATTR_NONNULL(1);
+
+}  // namespace blender