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// Copyright 2022 The Dawn 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 SRC_DAWN_COMMON_NUMERIC_H_
#define SRC_DAWN_COMMON_NUMERIC_H_
#include <cstdint>
#include <limits>
#include <type_traits>
#include "dawn/common/Assert.h"
namespace dawn {
namespace detail {
template <typename T>
inline constexpr uint32_t u32_sizeof() {
static_assert(sizeof(T) <= std::numeric_limits<uint32_t>::max());
return uint32_t(sizeof(T));
}
template <typename T>
inline constexpr uint32_t u32_alignof() {
static_assert(alignof(T) <= std::numeric_limits<uint32_t>::max());
return uint32_t(alignof(T));
}
} // namespace detail
template <typename T>
inline constexpr uint32_t u32_sizeof = detail::u32_sizeof<T>();
template <typename T>
inline constexpr uint32_t u32_alignof = detail::u32_alignof<T>();
// Only defined for unsigned integers because that is all that is
// needed at the time of writing.
template <typename Dst, typename Src, typename = std::enable_if_t<std::is_unsigned_v<Src>>>
inline Dst checked_cast(const Src& value) {
ASSERT(value <= std::numeric_limits<Dst>::max());
return static_cast<Dst>(value);
}
template <typename T>
bool IsDoubleValueRepresentable(double value) {
if constexpr (std::is_same_v<T, float> || std::is_integral_v<T>) {
// Following WebIDL 3.3.6.[EnforceRange] for integral
// Following WebIDL 3.2.5.float for float
// TODO(crbug.com/1396194): now follows what blink does but may need revisit.
constexpr double kLowest = static_cast<double>(std::numeric_limits<T>::lowest());
constexpr double kMax = static_cast<double>(std::numeric_limits<T>::max());
return kLowest <= value && value <= kMax;
} else {
static_assert(std::is_same_v<T, float> || std::is_integral_v<T>, "Unsupported type");
}
}
// Returns if two inclusive integral ranges [x0, x1] and [y0, y1] have overlap.
template <typename T>
bool RangesOverlap(T x0, T x1, T y0, T y1) {
ASSERT(x0 <= x1 && y0 <= y1);
if constexpr (std::is_integral_v<T>) {
// Two ranges DON'T have overlap if and only if:
// 1. [x0, x1] [y0, y1], or
// 2. [y0, y1] [x0, x1]
// which is (x1 < y0 || y1 < x0)
// The inverse of which ends in the following statement.
return x0 <= y1 && y0 <= x1;
} else {
static_assert(std::is_integral_v<T>, "Unsupported type");
}
}
} // namespace dawn
#endif // SRC_DAWN_COMMON_NUMERIC_H_