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// Copyright 2022 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#ifndef SkContainers_DEFINED
#define SkContainers_DEFINED
#include "include/private/base/SkAPI.h"
#include "include/private/base/SkAlign.h"
#include "include/private/base/SkSpan_impl.h"
#include <cstddef>
#include <cstdint>
class SK_SPI SkContainerAllocator {
public:
SkContainerAllocator(size_t sizeOfT, int maxCapacity)
: fSizeOfT{sizeOfT}
, fMaxCapacity{maxCapacity} {}
// allocate will abort on failure. Given a capacity of 0, it will return the empty span.
// The bytes allocated are freed using sk_free().
SkSpan<std::byte> allocate(int capacity, double growthFactor = 1.0);
// Rounds a requested capacity up towards `kCapacityMultiple` in a constexpr-friendly fashion.
template <typename T>
static constexpr size_t RoundUp(size_t capacity) {
return SkAlignTo(capacity * sizeof(T), (size_t) kCapacityMultiple) / sizeof(T);
}
private:
friend struct SkContainerAllocatorTestingPeer;
// All capacity counts will be rounded up to kCapacityMultiple. This matches ASAN's shadow
// granularity, as well as our typical struct alignment on a 64-bit machine.
static constexpr int64_t kCapacityMultiple = 8;
// Rounds up capacity to next multiple of kCapacityMultiple and pin to fMaxCapacity.
size_t roundUpCapacity(int64_t capacity) const;
// Grows the capacity by growthFactor being sure to stay with in kMinBytes and fMaxCapacity.
size_t growthFactorCapacity(int capacity, double growthFactor) const;
const size_t fSizeOfT;
const int64_t fMaxCapacity;
};
// sk_allocate_canfail returns the empty span on failure. Parameter size must be > 0.
SkSpan<std::byte> sk_allocate_canfail(size_t size);
// Returns the empty span if size is 0. sk_allocate_throw aborts on failure.
SkSpan<std::byte> sk_allocate_throw(size_t size);
SK_SPI void sk_report_container_overflow_and_die();
#endif // SkContainers_DEFINED
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