| // 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_ |