From e8d277081293b6fb2a5d469616baaa7a06f52496 Mon Sep 17 00:00:00 2001
From: qinxialei <xialeiqin@gmail.com>
Date: Thu, 29 Oct 2020 11:26:59 +0800
Subject: Import Upstream version 0.16.0

---
 src/utils/dynamic_buffer.h | 82 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 src/utils/dynamic_buffer.h

(limited to 'src/utils/dynamic_buffer.h')

diff --git a/src/utils/dynamic_buffer.h b/src/utils/dynamic_buffer.h
new file mode 100644
index 0000000..b51345a
--- /dev/null
+++ b/src/utils/dynamic_buffer.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2020 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_UTILS_DYNAMIC_BUFFER_H_
+#define LIBGAV1_SRC_UTILS_DYNAMIC_BUFFER_H_
+
+#include <memory>
+#include <new>
+
+#include "src/utils/memory.h"
+
+namespace libgav1 {
+
+template <typename T>
+class DynamicBuffer {
+ public:
+  T* get() { return buffer_.get(); }
+  const T* get() const { return buffer_.get(); }
+
+  // Resizes the buffer so that it can hold at least |size| elements. Existing
+  // contents will be destroyed when resizing to a larger size.
+  //
+  // Returns true on success. If Resize() returns false, then subsequent calls
+  // to get() will return nullptr.
+  bool Resize(size_t size) {
+    if (size <= size_) return true;
+    buffer_.reset(new (std::nothrow) T[size]);
+    if (buffer_ == nullptr) {
+      size_ = 0;
+      return false;
+    }
+    size_ = size;
+    return true;
+  }
+
+ private:
+  std::unique_ptr<T[]> buffer_;
+  size_t size_ = 0;
+};
+
+template <typename T, int alignment>
+class AlignedDynamicBuffer {
+ public:
+  T* get() { return buffer_.get(); }
+
+  // Resizes the buffer so that it can hold at least |size| elements. Existing
+  // contents will be destroyed when resizing to a larger size.
+  //
+  // Returns true on success. If Resize() returns false, then subsequent calls
+  // to get() will return nullptr.
+  bool Resize(size_t size) {
+    if (size <= size_) return true;
+    buffer_ = MakeAlignedUniquePtr<T>(alignment, size);
+    if (buffer_ == nullptr) {
+      size_ = 0;
+      return false;
+    }
+    size_ = size;
+    return true;
+  }
+
+ private:
+  AlignedUniquePtr<T> buffer_;
+  size_t size_ = 0;
+};
+
+}  // namespace libgav1
+
+#endif  // LIBGAV1_SRC_UTILS_DYNAMIC_BUFFER_H_
-- 
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