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b779b2b13d
Bug: chromium:957519 Change-Id: Id7bf01df556fd9dd1ac7e587bfecd2a522122c9f Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97841 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Stephan Hartmann <stha09@googlemail.com>
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
// Copyright 2022 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_DAWN_NATIVE_BLOB_H_
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#define SRC_DAWN_NATIVE_BLOB_H_
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#include <cstdint>
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#include <functional>
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#include <type_traits>
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#include <utility>
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#include <vector>
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namespace dawn::native {
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// Blob represents a block of bytes. It may be constructed from
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// various other container types and uses type erasure to take
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// ownership of the container and release its memory on destruction.
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class Blob {
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public:
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// This function is used to create Blob with actual data.
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// Make sure the creation and deleter handles the data ownership and lifetime correctly.
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static Blob UnsafeCreateWithDeleter(uint8_t* data, size_t size, std::function<void()> deleter);
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Blob();
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~Blob();
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Blob(const Blob&) = delete;
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Blob& operator=(const Blob&) = delete;
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Blob(Blob&&);
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Blob& operator=(Blob&&);
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bool Empty() const;
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const uint8_t* Data() const;
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uint8_t* Data();
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size_t Size() const;
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// If the blob data is not aligned to |alignment|, copy it into a new backing store which
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// is aligned.
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void AlignTo(size_t alignment);
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private:
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// The constructor should be responsible to take ownership of |data| and releases ownership by
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// calling |deleter|. The deleter function is called at ~Blob() and during std::move.
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explicit Blob(uint8_t* data, size_t size, std::function<void()> deleter);
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uint8_t* mData;
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size_t mSize;
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std::function<void()> mDeleter;
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};
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Blob CreateBlob(size_t size, size_t alignment = 1);
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template <typename T, typename = std::enable_if_t<std::is_fundamental_v<T>>>
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Blob CreateBlob(std::vector<T> vec) {
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uint8_t* data = reinterpret_cast<uint8_t*>(vec.data());
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size_t size = vec.size() * sizeof(T);
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// Move the vector into a new allocation so we can destruct it in the deleter.
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auto* wrapped_vec = new std::vector<T>(std::move(vec));
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return Blob::UnsafeCreateWithDeleter(data, size, [wrapped_vec]() { delete wrapped_vec; });
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}
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} // namespace dawn::native
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#endif // SRC_DAWN_NATIVE_BLOB_H_
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