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// Copyright 2022 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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) {
DAWN_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) {
DAWN_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_