| 1 | /* |
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| 2 | * Copyright (C) 2016 The Qt Company Ltd. |
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| 3 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
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| 4 | * |
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| 5 | * SPDX-License-Identifier: MIT |
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| 6 | */ |
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| 7 | |
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| 8 | #pragma once |
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| 9 | |
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| 10 | #include "BitUtils.h" |
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| 11 | #include "YGFloatOptional.h" |
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| 12 | #include "Yoga-internal.h" |
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| 13 | |
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| 14 | QT_YOGA_NAMESPACE_BEGIN |
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| 15 | |
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| 16 | struct YGLayout { |
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| 17 | std::array<float, 4> position = {}; |
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| 18 | std::array<float, 2> dimensions = {._M_elems: {YGUndefined, YGUndefined}}; |
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| 19 | std::array<float, 4> margin = {}; |
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| 20 | std::array<float, 4> border = {}; |
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| 21 | std::array<float, 4> padding = {}; |
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| 22 | |
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| 23 | private: |
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| 24 | static constexpr size_t directionOffset = 0; |
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| 25 | static constexpr size_t hadOverflowOffset = |
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| 26 | directionOffset + facebook::yoga::detail::bitWidthFn<YGDirection>(); |
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| 27 | uint8_t flags = 0; |
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| 28 | |
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| 29 | public: |
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| 30 | uint32_t computedFlexBasisGeneration = 0; |
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| 31 | YGFloatOptional computedFlexBasis = {}; |
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| 32 | |
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| 33 | // Instead of recomputing the entire layout every single time, we cache some |
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| 34 | // information to break early when nothing changed |
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| 35 | uint32_t generationCount = 0; |
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| 36 | YGDirection lastOwnerDirection = YGDirectionInherit; |
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| 37 | |
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| 38 | uint32_t nextCachedMeasurementsIndex = 0; |
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| 39 | std::array<YGCachedMeasurement, YG_MAX_CACHED_RESULT_COUNT> |
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| 40 | cachedMeasurements = {}; |
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| 41 | std::array<float, 2> measuredDimensions = {._M_elems: {YGUndefined, YGUndefined}}; |
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| 42 | |
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| 43 | YGCachedMeasurement cachedLayout = YGCachedMeasurement(); |
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| 44 | |
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| 45 | YGDirection direction() const { |
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| 46 | return facebook::yoga::detail::getEnumData<YGDirection>( |
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| 47 | flags, index: directionOffset); |
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| 48 | } |
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| 49 | |
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| 50 | void setDirection(YGDirection direction) { |
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| 51 | facebook::yoga::detail::setEnumData<YGDirection>( |
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| 52 | flags, index: directionOffset, newValue: direction); |
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| 53 | } |
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| 54 | |
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| 55 | bool hadOverflow() const { |
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| 56 | return facebook::yoga::detail::getBooleanData(flags, index: hadOverflowOffset); |
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| 57 | } |
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| 58 | void setHadOverflow(bool hadOverflow) { |
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| 59 | facebook::yoga::detail::setBooleanData( |
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| 60 | flags, index: hadOverflowOffset, value: hadOverflow); |
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| 61 | } |
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| 62 | |
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| 63 | bool operator==(YGLayout layout) const; |
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| 64 | bool operator!=(YGLayout layout) const { return !(*this == layout); } |
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| 65 | }; |
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| 66 | |
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| 67 | QT_YOGA_NAMESPACE_END |
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| 68 | |
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