47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
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// Copyright 2022 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#ifndef SkContainers_DEFINED
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#define SkContainers_DEFINED
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#include "include/private/base/SkAPI.h"
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#include "include/private/base/SkSpan_impl.h"
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#include <cstddef>
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#include <cstdint>
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class SK_SPI SkContainerAllocator {
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public:
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SkContainerAllocator(size_t sizeOfT, int maxCapacity)
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: fSizeOfT{sizeOfT}
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, fMaxCapacity{maxCapacity} {}
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// allocate will abort on failure. Given a capacity of 0, it will return the empty span.
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// The bytes allocated are freed using sk_free().
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SkSpan<std::byte> allocate(int capacity, double growthFactor = 1.0);
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private:
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friend struct SkContainerAllocatorTestingPeer;
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// All capacity counts will be rounded up to kCapacityMultiple.
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// TODO: this is a constant from the original SkTArray code. This should be checked some how.
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static constexpr int64_t kCapacityMultiple = 8;
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// Rounds up capacity to next multiple of kCapacityMultiple and pin to fMaxCapacity.
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size_t roundUpCapacity(int64_t capacity) const;
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// Grows the capacity by growthFactor being sure to stay with in kMinBytes and fMaxCapacity.
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size_t growthFactorCapacity(int capacity, double growthFactor) const;
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const size_t fSizeOfT;
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const int64_t fMaxCapacity;
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};
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// sk_allocate_canfail returns the empty span on failure. Parameter size must be > 0.
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SkSpan<std::byte> sk_allocate_canfail(size_t size);
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// Returns the empty span if size is 0. sk_allocate_throw aborts on failure.
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SkSpan<std::byte> sk_allocate_throw(size_t size);
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SK_SPI void sk_report_container_overflow_and_die();
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#endif // SkContainers_DEFINED
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