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GridTrackSizingAlgorithm.cpp
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2219 lines (1875 loc) · 113 KB
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/*
* Copyright (C) 2017 Igalia S.L.
* Copyright (C) 2024-2025 Apple Inc. All rights reserved.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "GridTrackSizingAlgorithm.h"
#include "AncestorSubgridIterator.h"
#include "Grid.h"
#include "GridArea.h"
#include "GridLayoutFunctions.h"
#include "RenderElementStyleInlines.h"
#include "RenderGrid.h"
#include "RenderObjectInlines.h"
#include "RenderStyleConstants.h"
#include "StyleGridPositionsResolver.h"
#include "StyleSelfAlignmentData.h"
#include <ranges>
#include <wtf/Range.h>
#include <wtf/StdMap.h>
#include <wtf/TZoneMallocInlines.h>
#include <wtf/Vector.h>
#include <wtf/WeakPtr.h>
#include <wtf/text/ParsingUtilities.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(GridTrack);
WTF_MAKE_TZONE_ALLOCATED_IMPL(GridTrackSizingAlgorithm);
WTF_MAKE_TZONE_ALLOCATED_IMPL(GridTrackSizingAlgorithmStrategy);
GridTrackSizingAlgorithm::GridTrackSizingAlgorithm(const RenderGrid* renderGrid, Grid& grid)
: m_grid(grid)
, m_renderGrid(renderGrid)
, m_sizingState(SizingState::ColumnSizingFirstIteration)
{
}
GridTrackSizingAlgorithm::~GridTrackSizingAlgorithm() = default;
LayoutUnit GridTrack::baseSize() const
{
ASSERT(isGrowthLimitBiggerThanBaseSize());
return std::max(m_baseSize, 0_lu);
}
LayoutUnit GridTrack::unclampedBaseSize() const
{
ASSERT(isGrowthLimitBiggerThanBaseSize());
return m_baseSize;
}
const LayoutUnit& GridTrack::growthLimit() const
{
ASSERT(isGrowthLimitBiggerThanBaseSize());
ASSERT(!m_growthLimitCap || m_growthLimitCap.value() >= m_growthLimit || baseSize() >= m_growthLimitCap.value());
return m_growthLimit;
}
void GridTrack::setBaseSize(LayoutUnit baseSize)
{
m_baseSize = baseSize;
ensureGrowthLimitIsBiggerThanBaseSize();
}
void GridTrack::setGrowthLimit(LayoutUnit growthLimit)
{
m_growthLimit = growthLimit == infinity ? growthLimit : std::min(growthLimit, m_growthLimitCap.value_or(growthLimit));
ensureGrowthLimitIsBiggerThanBaseSize();
}
LayoutUnit GridTrack::growthLimitIfNotInfinite() const
{
ASSERT(isGrowthLimitBiggerThanBaseSize());
return m_growthLimit == infinity ? baseSize() : m_growthLimit;
}
void GridTrack::setTempSize(const LayoutUnit& tempSize)
{
ASSERT(tempSize >= 0);
ASSERT(growthLimitIsInfinite() || growthLimit() >= tempSize);
m_tempSize = tempSize;
}
void GridTrack::growTempSize(const LayoutUnit& tempSize)
{
ASSERT(tempSize >= 0);
m_tempSize += tempSize;
}
void GridTrack::setGrowthLimitCap(std::optional<LayoutUnit> growthLimitCap)
{
ASSERT(!growthLimitCap || growthLimitCap.value() >= 0);
m_growthLimitCap = growthLimitCap;
}
const Style::GridTrackSize& GridTrack::cachedTrackSize() const
{
RELEASE_ASSERT(m_cachedTrackSize);
return *m_cachedTrackSize;
}
void GridTrack::setCachedTrackSize(const Style::GridTrackSize& cachedTrackSize)
{
m_cachedTrackSize = cachedTrackSize;
}
void GridTrack::ensureGrowthLimitIsBiggerThanBaseSize()
{
if (m_growthLimit != infinity && m_growthLimit < std::max(m_baseSize, 0_lu))
m_growthLimit = std::max(m_baseSize, 0_lu);
}
static bool NODELETE hasRelativeMarginOrPaddingForGridItem(const RenderBox& gridItem, Style::GridTrackSizingDirection direction)
{
if (direction == Style::GridTrackSizingDirection::Columns)
return gridItem.style().marginStart().isPercentOrCalculated() || gridItem.style().marginEnd().isPercentOrCalculated() || gridItem.style().paddingStart().isPercentOrCalculated() || gridItem.style().paddingEnd().isPercentOrCalculated();
return gridItem.style().marginBefore().isPercentOrCalculated() || gridItem.style().marginAfter().isPercentOrCalculated() || gridItem.style().paddingBefore().isPercentOrCalculated() || gridItem.style().paddingAfter().isPercentOrCalculated();
}
static bool NODELETE hasRelativeOrKeywordOrAutoSizeForGridItem(const RenderBox& gridItem, Style::GridTrackSizingDirection direction)
{
if (direction == Style::GridTrackSizingDirection::Columns)
return gridItem.hasRelativeLogicalWidth() || gridItem.style().logicalWidth().isSizingKeywordOrAuto();
return gridItem.hasRelativeLogicalHeight() || gridItem.style().logicalHeight().isSizingKeywordOrAuto();
}
static bool NODELETE shouldClearOverridingContainingBlockContentSizeForGridItem(const RenderBox& gridItem, Style::GridTrackSizingDirection direction)
{
return hasRelativeOrKeywordOrAutoSizeForGridItem(gridItem, direction) || hasRelativeMarginOrPaddingForGridItem(gridItem, direction);
}
static void setOverridingContainingBlockContentSizeForGridItem(const RenderGrid& grid, RenderBox& gridItem, Style::GridTrackSizingDirection direction, std::optional<LayoutUnit> size)
{
// This function sets the dimension based on the writing mode of the containing block.
// For subgrids, this might not be the outermost grid, but could be a subgrid. If the
// writing mode of the CB and the grid for which we're doing sizing don't match, swap
// the directions.
direction = GridLayoutFunctions::flowAwareDirectionForGridItem(grid, *gridItem.containingBlock(), direction);
if (direction == Style::GridTrackSizingDirection::Columns)
gridItem.setGridAreaContentLogicalWidth(size);
else
gridItem.setGridAreaContentLogicalHeight(size);
}
// GridTrackSizingAlgorithm private.
void GridTrackSizingAlgorithm::setFreeSpace(Style::GridTrackSizingDirection direction, std::optional<LayoutUnit> freeSpace)
{
if (direction == Style::GridTrackSizingDirection::Columns)
m_freeSpaceColumns = freeSpace;
else
m_freeSpaceRows = freeSpace;
}
std::optional<LayoutUnit> GridTrackSizingAlgorithm::availableSpace() const
{
ASSERT(wasSetup());
return availableSpace(m_direction);
}
void GridTrackSizingAlgorithm::setAvailableSpace(Style::GridTrackSizingDirection direction, std::optional<LayoutUnit> availableSpace)
{
if (direction == Style::GridTrackSizingDirection::Columns)
m_availableSpaceColumns = availableSpace;
else
m_availableSpaceRows = availableSpace;
}
LayoutUnit GridTrackSizingAlgorithm::computeTrackBasedSize() const
{
if (isDirectionInMasonryDirection())
return m_renderGrid->masonryContentSize();
WTF::Range<size_t> rangeToIgnore;
if (m_renderGrid->shouldCheckExplicitIntrinsicInnerLogicalSize(m_direction) && m_renderGrid->autoRepeatType(m_direction) == AutoRepeatType::Fit)
rangeToIgnore = m_renderGrid->autoRepeatTracksRange(m_direction);
auto& tracks = this->tracks(m_direction);
LayoutUnit size;
for (size_t i = 0; i < tracks.size(); ++i) {
if (rangeToIgnore && i == rangeToIgnore.begin()) {
i += rangeToIgnore.distance() - 1;
continue;
}
size += tracks[i]->baseSize();
}
size += m_renderGrid->guttersSize(m_direction, 0, tracks.size() - rangeToIgnore.distance(), availableSpace());
return size;
}
LayoutUnit GridTrackSizingAlgorithm::initialBaseSize(const Style::GridTrackSize& trackSize) const
{
auto& gridLength = trackSize.minTrackBreadth();
if (gridLength.isFlex())
return 0;
auto& trackLength = gridLength.length();
if (trackLength.isSpecified())
return Style::evaluate<LayoutUnit>(trackLength, std::max<LayoutUnit>(availableSpace().value_or(0), 0), Style::ZoomNeeded { });
ASSERT(trackLength.isMinContent() || trackLength.isAuto() || trackLength.isMaxContent());
return 0;
}
LayoutUnit GridTrackSizingAlgorithm::initialGrowthLimit(const Style::GridTrackSize& trackSize, LayoutUnit baseSize) const
{
auto& gridLength = trackSize.maxTrackBreadth();
if (gridLength.isFlex())
return trackSize.minTrackBreadth().isContentSized() ? LayoutUnit(infinity) : baseSize;
auto& trackLength = gridLength.length();
if (trackLength.isSpecified())
return Style::evaluate<LayoutUnit>(trackLength, std::max<LayoutUnit>(availableSpace().value_or(0), 0), Style::ZoomNeeded { });
ASSERT(trackLength.isMinContent() || trackLength.isAuto() || trackLength.isMaxContent());
return infinity;
}
void GridTrackSizingAlgorithm::sizeTrackToFitSingleSpanMasonryGroup(const GridSpan& span, MasonryMinMaxTrackSize& masonryIndefiniteItems, GridTrack& track)
{
auto trackPosition = span.startLine();
const auto& trackSize = tracks(m_direction)[trackPosition]->cachedTrackSize();
if (trackSize.hasMinContentMinTrackBreadth())
track.setBaseSize(std::max(track.baseSize(), masonryIndefiniteItems.minContentSize));
else if (trackSize.hasMaxContentMinTrackBreadth())
track.setBaseSize(std::max(track.baseSize(), masonryIndefiniteItems.maxContentSize));
else if (trackSize.hasAutoMinTrackBreadth())
track.setBaseSize(std::max(track.baseSize(), masonryIndefiniteItems.minSize));
if (trackSize.hasMinContentMaxTrackBreadth())
track.setGrowthLimit(std::max(track.growthLimit(), masonryIndefiniteItems.minContentSize));
else if (trackSize.hasMaxContentOrAutoMaxTrackBreadth()) {
auto growthLimit = masonryIndefiniteItems.maxContentSize;
if (trackSize.isFitContent())
growthLimit = std::min(growthLimit, Style::evaluate<LayoutUnit>(trackSize.fitContentTrackLength(), availableSpace().value_or(0), Style::ZoomNeeded { }));
track.setGrowthLimit(std::max(track.growthLimit(), growthLimit));
}
}
void GridTrackSizingAlgorithm::sizeTrackToFitNonSpanningItem(const GridSpan& span, RenderBox& gridItem, GridTrack& track, RenderGridLayoutState& gridLayoutState)
{
unsigned trackPosition = span.startLine();
const auto& trackSize = tracks(m_direction)[trackPosition]->cachedTrackSize();
if (trackSize.hasMinContentMinTrackBreadth()) {
track.setBaseSize(std::max(track.baseSize(), m_strategy->minContentContributionForGridItem(gridItem, gridLayoutState)));
} else if (trackSize.hasMaxContentMinTrackBreadth()) {
track.setBaseSize(std::max(track.baseSize(), m_strategy->maxContentContributionForGridItem(gridItem, gridLayoutState)));
} else if (trackSize.hasAutoMinTrackBreadth()) {
track.setBaseSize(std::max(track.baseSize(), m_strategy->minContributionForGridItem(gridItem, gridLayoutState)));
}
if (trackSize.hasMinContentMaxTrackBreadth()) {
track.setGrowthLimit(std::max(track.growthLimit(), m_strategy->minContentContributionForGridItem(gridItem, gridLayoutState)));
} else if (trackSize.hasMaxContentOrAutoMaxTrackBreadth()) {
LayoutUnit growthLimit = m_strategy->maxContentContributionForGridItem(gridItem, gridLayoutState);
if (trackSize.isFitContent())
growthLimit = std::min(growthLimit, Style::evaluate<LayoutUnit>(trackSize.fitContentTrackLength(), availableSpace().value_or(0), Style::ZoomNeeded { }));
track.setGrowthLimit(std::max(track.growthLimit(), growthLimit));
}
}
bool GridTrackSizingAlgorithm::spanningItemCrossesFlexibleSizedTracks(const GridSpan& itemSpan) const
{
auto& trackList = tracks(m_direction);
for (auto trackPosition : itemSpan) {
const auto& trackSize = trackList[trackPosition]->cachedTrackSize();
if (trackSize.minTrackBreadth().isFlex() || trackSize.maxTrackBreadth().isFlex())
return true;
}
return false;
}
class GridItemWithSpan {
public:
GridItemWithSpan(RenderBox& gridItem, GridSpan span)
: m_gridItem(gridItem)
, m_span(span)
{
}
RenderBox& NODELETE gridItem() const { return m_gridItem; }
GridSpan NODELETE span() const { return m_span; }
bool operator<(const GridItemWithSpan other) const { return m_span.integerSpan() < other.m_span.integerSpan(); }
private:
std::reference_wrapper<RenderBox> m_gridItem;
GridSpan m_span;
};
enum class TrackSizeRestriction : uint8_t {
AllowInfinity,
ForbidInfinity,
};
LayoutUnit GridTrackSizingAlgorithm::itemSizeForTrackSizeComputationPhase(TrackSizeComputationPhase phase, RenderBox& gridItem, RenderGridLayoutState& gridLayoutState) const
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
return m_strategy->minContributionForGridItem(gridItem, gridLayoutState);
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
return m_strategy->minContentContributionForGridItem(gridItem, gridLayoutState);
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
return m_strategy->maxContentContributionForGridItem(gridItem, gridLayoutState);
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit GridTrackSizingAlgorithm::itemSizeForTrackSizeComputationPhaseMasonry(TrackSizeComputationPhase phase, const MasonryMinMaxTrackSize& trackSize) const
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
return trackSize.minSize;
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
return trackSize.minContentSize;
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
return trackSize.maxContentSize;
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}
static bool NODELETE shouldProcessTrackForTrackSizeComputationPhase(TrackSizeComputationPhase phase, const Style::GridTrackSize& trackSize)
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
return trackSize.hasIntrinsicMinTrackBreadth();
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
return trackSize.hasMinOrMaxContentMinTrackBreadth();
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
return trackSize.hasMaxContentMinTrackBreadth();
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
return trackSize.hasIntrinsicMaxTrackBreadth();
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
return trackSize.hasMaxContentOrAutoMaxTrackBreadth();
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return false;
}
ASSERT_NOT_REACHED();
return false;
}
static LayoutUnit trackSizeForTrackSizeComputationPhase(TrackSizeComputationPhase phase, GridTrack& track, TrackSizeRestriction restriction)
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
case TrackSizeComputationPhase::MaximizeTracks:
return track.baseSize();
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
return restriction == TrackSizeRestriction::AllowInfinity ? track.growthLimit() : track.growthLimitIfNotInfinite();
}
ASSERT_NOT_REACHED();
return track.baseSize();
}
static void updateTrackSizeForTrackSizeComputationPhase(TrackSizeComputationPhase phase, GridTrack& track)
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
track.setBaseSize(track.plannedSize());
return;
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
track.setGrowthLimit(track.plannedSize());
return;
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return;
}
ASSERT_NOT_REACHED();
}
static bool NODELETE trackShouldGrowBeyondGrowthLimitsForTrackSizeComputationPhase(TrackSizeComputationPhase phase, const Style::GridTrackSize& trackSize)
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
return trackSize.hasAutoOrMinContentMinTrackBreadthAndIntrinsicMaxTrackBreadth();
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
return trackSize.hasMaxContentMinTrackBreadthAndMaxContentMaxTrackBreadth();
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
return true;
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return false;
}
ASSERT_NOT_REACHED();
return false;
}
static void markAsInfinitelyGrowableForTrackSizeComputationPhase(TrackSizeComputationPhase phase, GridTrack& track)
{
switch (phase) {
case TrackSizeComputationPhase::ResolveIntrinsicMinimums:
case TrackSizeComputationPhase::ResolveContentBasedMinimums:
case TrackSizeComputationPhase::ResolveMaxContentMinimums:
return;
case TrackSizeComputationPhase::ResolveIntrinsicMaximums:
if (trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::AllowInfinity) == infinity && track.plannedSize() != infinity)
track.setInfinitelyGrowable(true);
return;
case TrackSizeComputationPhase::ResolveMaxContentMaximums:
if (track.infinitelyGrowable())
track.setInfinitelyGrowable(false);
return;
case TrackSizeComputationPhase::MaximizeTracks:
ASSERT_NOT_REACHED();
return;
}
ASSERT_NOT_REACHED();
}
template <TrackSizeComputationVariant variant, TrackSizeComputationPhase phase>
void GridTrackSizingAlgorithm::increaseSizesToAccommodateSpanningItems(GridItemsSpanGroupRange gridItemsWithSpan, RenderGridLayoutState& gridLayoutState)
{
auto& allTracks = tracks(m_direction);
for (const auto& trackIndex : m_contentSizedTracksIndex) {
GridTrack& track = allTracks[trackIndex];
track.setPlannedSize(trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::AllowInfinity));
}
Vector<CheckedRef<GridTrack>> growBeyondGrowthLimitsTracks;
Vector<CheckedRef<GridTrack>> filteredTracks;
for (auto& gridItemWithSpan : gridItemsWithSpan) {
const GridSpan& itemSpan = gridItemWithSpan.span();
ASSERT(variant == TrackSizeComputationVariant::CrossingFlexibleTracks || itemSpan.integerSpan() > 1u);
filteredTracks.shrink(0);
growBeyondGrowthLimitsTracks.shrink(0);
LayoutUnit spanningTracksSize;
for (auto trackPosition : itemSpan) {
GridTrack& track = allTracks[trackPosition];
const auto& trackSize = track.cachedTrackSize();
spanningTracksSize += trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::ForbidInfinity);
if (variant == TrackSizeComputationVariant::CrossingFlexibleTracks && !trackSize.maxTrackBreadth().isFlex())
continue;
if (!shouldProcessTrackForTrackSizeComputationPhase(phase, trackSize))
continue;
filteredTracks.append(track);
if (trackShouldGrowBeyondGrowthLimitsForTrackSizeComputationPhase(phase, trackSize))
growBeyondGrowthLimitsTracks.append(track);
}
if (filteredTracks.isEmpty())
continue;
spanningTracksSize += m_renderGrid->guttersSize(m_direction, itemSpan.startLine(), itemSpan.integerSpan(), availableSpace());
LayoutUnit extraSpace = itemSizeForTrackSizeComputationPhase(phase, gridItemWithSpan.gridItem(), gridLayoutState) - spanningTracksSize;
extraSpace = std::max<LayoutUnit>(extraSpace, 0);
auto& tracksToGrowBeyondGrowthLimits = growBeyondGrowthLimitsTracks.isEmpty() ? filteredTracks : growBeyondGrowthLimitsTracks;
distributeSpaceToTracks<variant, phase>(filteredTracks, &tracksToGrowBeyondGrowthLimits, extraSpace);
}
for (const auto& trackIndex : m_contentSizedTracksIndex) {
GridTrack& track = allTracks[trackIndex];
markAsInfinitelyGrowableForTrackSizeComputationPhase(phase, track);
updateTrackSizeForTrackSizeComputationPhase(phase, track);
}
}
template <TrackSizeComputationVariant variant>
void GridTrackSizingAlgorithm::increaseSizesToAccommodateSpanningItems(GridItemsSpanGroupRange gridItemsWithSpan, RenderGridLayoutState& gridLayoutState)
{
increaseSizesToAccommodateSpanningItems<variant, TrackSizeComputationPhase::ResolveIntrinsicMinimums>(gridItemsWithSpan, gridLayoutState);
increaseSizesToAccommodateSpanningItems<variant, TrackSizeComputationPhase::ResolveContentBasedMinimums>(gridItemsWithSpan, gridLayoutState);
increaseSizesToAccommodateSpanningItems<variant, TrackSizeComputationPhase::ResolveMaxContentMinimums>(gridItemsWithSpan, gridLayoutState);
increaseSizesToAccommodateSpanningItems<variant, TrackSizeComputationPhase::ResolveIntrinsicMaximums>(gridItemsWithSpan, gridLayoutState);
increaseSizesToAccommodateSpanningItems<variant, TrackSizeComputationPhase::ResolveMaxContentMaximums>(gridItemsWithSpan, gridLayoutState);
}
template <TrackSizeComputationVariant variant>
void GridTrackSizingAlgorithm::increaseSizesToAccommodateSpanningItemsMasonry(StdMap<SpanLength, Vector<MasonryMinMaxTrackSizeWithGridSpan>>& definiteItemSizes)
{
auto increaseSizes = [&]<TrackSizeComputationPhase phase>(Vector<MasonryMinMaxTrackSizeWithGridSpan>& definiteItemSizes)
{
auto& allTracks = tracks(m_direction);
for (const auto& trackIndex : m_contentSizedTracksIndex) {
auto& track = allTracks[trackIndex];
track->setPlannedSize(trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::AllowInfinity));
}
Vector<CheckedRef<GridTrack>> growBeyondGrowthLimitsTracks;
Vector<CheckedRef<GridTrack>> filteredTracks;
for (auto definiteItem : definiteItemSizes) {
const auto& itemSpan = definiteItem.gridSpan;
ASSERT(variant == TrackSizeComputationVariant::CrossingFlexibleTracks || itemSpan.integerSpan() > 1u);
filteredTracks.shrink(0);
growBeyondGrowthLimitsTracks.shrink(0);
LayoutUnit spanningTracksSize;
for (auto trackPosition : itemSpan) {
auto& track = allTracks[trackPosition];
const auto& trackSize = track->cachedTrackSize();
spanningTracksSize += trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::ForbidInfinity);
if (!shouldProcessTrackForTrackSizeComputationPhase(phase, trackSize))
continue;
filteredTracks.append(track);
if (trackShouldGrowBeyondGrowthLimitsForTrackSizeComputationPhase(phase, trackSize))
growBeyondGrowthLimitsTracks.append(track);
}
if (filteredTracks.isEmpty())
continue;
spanningTracksSize += m_renderGrid->guttersSize(m_direction, itemSpan.startLine(), itemSpan.integerSpan(), availableSpace());
auto extraSpace = itemSizeForTrackSizeComputationPhaseMasonry(phase, definiteItem.trackSize) - spanningTracksSize;
extraSpace = std::max<LayoutUnit>(extraSpace, 0);
auto& tracksToGrowBeyondGrowthLimits = growBeyondGrowthLimitsTracks.isEmpty() ? filteredTracks : growBeyondGrowthLimitsTracks;
distributeSpaceToTracks<variant, phase>(filteredTracks, &tracksToGrowBeyondGrowthLimits, extraSpace);
}
for (const auto& trackIndex : m_contentSizedTracksIndex) {
auto& track = allTracks[trackIndex];
markAsInfinitelyGrowableForTrackSizeComputationPhase(phase, track);
updateTrackSizeForTrackSizeComputationPhase(phase, track);
}
};
for (auto definiteItemSpanGroup : definiteItemSizes) {
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveIntrinsicMinimums>(definiteItemSpanGroup.second);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveContentBasedMinimums>(definiteItemSpanGroup.second);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveMaxContentMinimums>(definiteItemSpanGroup.second);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveIntrinsicMaximums>(definiteItemSpanGroup.second);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveMaxContentMaximums>(definiteItemSpanGroup.second);
}
}
template <TrackSizeComputationVariant variant>
void GridTrackSizingAlgorithm::increaseSizesToAccommodateSpanningItemsMasonryWithFlex(Vector<MasonryMinMaxTrackSizeWithGridSpan>& definiteItemSizesSpanFlexTracks)
{
auto increaseSizes = [&]<TrackSizeComputationPhase phase>(Vector<MasonryMinMaxTrackSizeWithGridSpan>& definiteItemSizesSpanFlexTracks)
{
auto& allTracks = tracks(m_direction);
for (const auto& trackIndex : m_contentSizedTracksIndex) {
auto& track = allTracks[trackIndex];
track->setPlannedSize(trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::AllowInfinity));
}
Vector<CheckedRef<GridTrack>> growBeyondGrowthLimitsTracks;
Vector<CheckedRef<GridTrack>> filteredTracks;
for (auto& item : definiteItemSizesSpanFlexTracks) {
const auto& itemSpan = item.gridSpan;
ASSERT(variant == TrackSizeComputationVariant::CrossingFlexibleTracks || itemSpan.integerSpan() > 1u);
filteredTracks.shrink(0);
growBeyondGrowthLimitsTracks.shrink(0);
LayoutUnit spanningTracksSize;
for (auto trackPosition : itemSpan) {
auto& track = allTracks[trackPosition];
const auto& trackSize = track->cachedTrackSize();
spanningTracksSize += trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::ForbidInfinity);
if (!trackSize.maxTrackBreadth().isFlex())
continue;
if (!shouldProcessTrackForTrackSizeComputationPhase(phase, trackSize))
continue;
filteredTracks.append(track);
if (trackShouldGrowBeyondGrowthLimitsForTrackSizeComputationPhase(phase, trackSize))
growBeyondGrowthLimitsTracks.append(track);
}
if (filteredTracks.isEmpty())
continue;
spanningTracksSize += m_renderGrid->guttersSize(m_direction, itemSpan.startLine(), itemSpan.integerSpan(), availableSpace());
auto extraSpace = itemSizeForTrackSizeComputationPhaseMasonry(phase, item.trackSize) - spanningTracksSize;
extraSpace = std::max<LayoutUnit>(extraSpace, 0);
auto& tracksToGrowBeyondGrowthLimits = growBeyondGrowthLimitsTracks.isEmpty() ? filteredTracks : growBeyondGrowthLimitsTracks;
distributeSpaceToTracks<variant, phase>(filteredTracks, &tracksToGrowBeyondGrowthLimits, extraSpace);
}
for (const auto& trackIndex : m_contentSizedTracksIndex) {
auto& track = allTracks[trackIndex];
markAsInfinitelyGrowableForTrackSizeComputationPhase(phase, track);
updateTrackSizeForTrackSizeComputationPhase(phase, track);
}
};
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveIntrinsicMinimums>(definiteItemSizesSpanFlexTracks);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveContentBasedMinimums>(definiteItemSizesSpanFlexTracks);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveMaxContentMinimums>(definiteItemSizesSpanFlexTracks);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveIntrinsicMaximums>(definiteItemSizesSpanFlexTracks);
increaseSizes.template operator()<TrackSizeComputationPhase::ResolveMaxContentMaximums>(definiteItemSizesSpanFlexTracks);
}
void GridTrackSizingAlgorithm::convertIndefiniteItemsToDefiniteMasonry(const StdMap<SpanLength, MasonryMinMaxTrackSize>& indefiniteSpanSizes, StdMap<SpanLength, Vector<MasonryMinMaxTrackSizeWithGridSpan>>& definiteItemSizes, Vector<MasonryMinMaxTrackSizeWithGridSpan>& definiteItemSizesSpanFlexTracks)
{
auto& allTracks = tracks(m_direction);
for (auto& indefiniteItem : indefiniteSpanSizes) {
for (size_t trackIndex = 0; trackIndex < allTracks.size(); trackIndex++) {
auto endLine = trackIndex + indefiniteItem.first;
auto itemSpan = GridSpan::translatedDefiniteGridSpan(trackIndex, endLine);
if (endLine > allTracks.size())
continue;
// The spec requires items with a span of 1 to be handled earlier.
if (itemSpan.integerSpan() != 1 && !spanningItemCrossesFlexibleSizedTracks(itemSpan))
definiteItemSizes[itemSpan.integerSpan()].append(MasonryMinMaxTrackSizeWithGridSpan { indefiniteItem.second, itemSpan });
if (spanningItemCrossesFlexibleSizedTracks(itemSpan))
definiteItemSizesSpanFlexTracks.append(MasonryMinMaxTrackSizeWithGridSpan { indefiniteItem.second, itemSpan });
}
}
}
template <TrackSizeComputationVariant variant>
static double NODELETE getSizeDistributionWeight(const GridTrack& track)
{
if (variant != TrackSizeComputationVariant::CrossingFlexibleTracks)
return 0;
ASSERT(track.cachedTrackSize().maxTrackBreadth().isFlex());
return track.cachedTrackSize().maxTrackBreadth().flex().value;
}
static bool sortByGridTrackGrowthPotential(const CheckedRef<GridTrack>& track1, const CheckedRef<GridTrack>& track2)
{
// This check ensures that we respect the irreflexivity property of the strict weak ordering required by std::sort
// (forall x: NOT x < x).
bool track1HasInfiniteGrowthPotentialWithoutCap = track1->infiniteGrowthPotential() && !track1->growthLimitCap();
bool track2HasInfiniteGrowthPotentialWithoutCap = track2->infiniteGrowthPotential() && !track2->growthLimitCap();
if (track1HasInfiniteGrowthPotentialWithoutCap && track2HasInfiniteGrowthPotentialWithoutCap)
return false;
if (track1HasInfiniteGrowthPotentialWithoutCap || track2HasInfiniteGrowthPotentialWithoutCap)
return track2HasInfiniteGrowthPotentialWithoutCap;
LayoutUnit track1Limit = track1->growthLimitCap().value_or(track1->growthLimit());
LayoutUnit track2Limit = track2->growthLimitCap().value_or(track2->growthLimit());
return (track1Limit - track1->baseSize()) < (track2Limit - track2->baseSize());
}
static void clampGrowthShareIfNeeded(TrackSizeComputationPhase phase, const GridTrack& track, LayoutUnit& growthShare)
{
if (phase != TrackSizeComputationPhase::ResolveMaxContentMaximums || !track.growthLimitCap())
return;
LayoutUnit distanceToCap = track.growthLimitCap().value() - track.tempSize();
if (distanceToCap <= 0)
return;
growthShare = std::min(growthShare, distanceToCap);
}
template <TrackSizeComputationPhase phase, SpaceDistributionLimit limit>
static void distributeItemIncurredIncreaseToTrack(GridTrack& track, LayoutUnit& freeSpace, double shareFraction)
{
LayoutUnit freeSpaceShare(freeSpace / shareFraction);
LayoutUnit growthShare = limit == SpaceDistributionLimit::BeyondGrowthLimit || track.infiniteGrowthPotential() ? freeSpaceShare : std::min(freeSpaceShare, track.growthLimit() - trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::ForbidInfinity));
clampGrowthShareIfNeeded(phase, track, growthShare);
ASSERT_WITH_MESSAGE(growthShare >= 0, "We must never shrink any grid track or else we can't guarantee we abide by our min-sizing function.");
track.growTempSize(growthShare);
freeSpace -= growthShare;
}
template <TrackSizeComputationVariant variant, TrackSizeComputationPhase phase, SpaceDistributionLimit limit>
static void distributeItemIncurredIncreases(Vector<CheckedRef<GridTrack>>& tracks, LayoutUnit& freeSpace)
{
uint32_t tracksSize = tracks.size();
if (!tracksSize)
return;
if (variant == TrackSizeComputationVariant::NotCrossingFlexibleTracks) {
// We have to sort tracks according to their growth potential. This is necessary even when distributing beyond growth limits,
// because there might be tracks with growth limit caps (like the ones with fit-content()) which cannot indefinitely grow over the limits.
std::ranges::sort(tracks, sortByGridTrackGrowthPotential);
for (uint32_t i = 0; i < tracksSize; ++i) {
ASSERT(!getSizeDistributionWeight<variant>(tracks[i]));
distributeItemIncurredIncreaseToTrack<phase, limit>(tracks[i], freeSpace, tracksSize - i);
}
return;
}
// We never grow flex tracks beyond growth limits, since they are infinite.
ASSERT(limit != SpaceDistributionLimit::BeyondGrowthLimit);
// For TrackSizeComputationVariant::CrossingFlexibleTracks we don't distribute equally, we need to take the weights into account.
Vector<double> fractionsOfRemainingSpace(tracksSize);
double weightSum = 0;
for (int32_t i = tracksSize - 1; i >= 0; --i) {
double weight = getSizeDistributionWeight<variant>(tracks[i]);
weightSum += weight;
fractionsOfRemainingSpace[i] = weightSum > 0 ? weightSum / weight : tracksSize - i;
}
for (uint32_t i = 0; i < tracksSize; ++i) {
// Sorting is not needed for TrackSizeComputationVariant::CrossingFlexibleTracks, since all tracks have an infinite growth potential.
ASSERT(tracks[i]->growthLimitIsInfinite());
distributeItemIncurredIncreaseToTrack<phase, limit>(tracks[i], freeSpace, fractionsOfRemainingSpace[i]);
}
}
template <TrackSizeComputationVariant variant, TrackSizeComputationPhase phase>
void GridTrackSizingAlgorithm::distributeSpaceToTracks(Vector<CheckedRef<GridTrack>>& tracks, Vector<CheckedRef<GridTrack>>* growBeyondGrowthLimitsTracks, LayoutUnit& freeSpace) const
{
ASSERT(freeSpace >= 0);
for (auto& track : tracks)
track->setTempSize(trackSizeForTrackSizeComputationPhase(phase, track, TrackSizeRestriction::ForbidInfinity));
if (freeSpace > 0)
distributeItemIncurredIncreases<variant, phase, SpaceDistributionLimit::UpToGrowthLimit>(tracks, freeSpace);
if (freeSpace > 0 && growBeyondGrowthLimitsTracks)
distributeItemIncurredIncreases<variant, phase, SpaceDistributionLimit::BeyondGrowthLimit>(*growBeyondGrowthLimitsTracks, freeSpace);
for (auto& track : tracks)
track->setPlannedSize(track->plannedSize() == infinity ? track->tempSize() : std::max(track->plannedSize(), track->tempSize()));
}
std::optional<LayoutUnit> GridTrackSizingAlgorithm::estimatedGridAreaBreadthForGridItem(const RenderBox& gridItem, Style::GridTrackSizingDirection direction) const
{
const GridSpan& span = m_renderGrid->gridSpanForGridItem(gridItem, direction);
LayoutUnit gridAreaSize;
bool gridAreaIsIndefinite = false;
std::optional<LayoutUnit> availableSize = availableSpace(direction);
for (auto trackPosition : span) {
// We may need to estimate the grid area size before running the track sizing algorithm in order to perform the pre-layout of orthogonal items.
// We cannot use tracks(direction)[trackPosition].cachedTrackSize() because tracks(direction) is empty, since we are either performing pre-layout
// or are running the track sizing algorithm in the opposite direction and haven't run it in the desired direction yet.
const auto& trackSize = wasSetup() ? calculateGridTrackSize(direction, trackPosition) : GridLayoutFunctions::rawGridTrackSize(m_renderGrid->style(), direction, trackPosition, m_grid.autoRepeatTracks(direction), m_grid.explicitGridStart(direction));
auto& maxTrackSize = trackSize.maxTrackBreadth();
if (maxTrackSize.isContentSized() || maxTrackSize.isFlex() || GridLayoutFunctions::isRelativeGridTrackBreadthAsAuto(maxTrackSize, availableSpace(direction)))
gridAreaIsIndefinite = true;
else
gridAreaSize += Style::evaluate<LayoutUnit>(maxTrackSize.length(), availableSize.value_or(0_lu), Style::ZoomNeeded { });
}
gridAreaSize += m_renderGrid->guttersSize(direction, span.startLine(), span.integerSpan(), availableSize);
auto gridItemInlineDirection = GridLayoutFunctions::flowAwareDirectionForGridItem(*m_renderGrid, gridItem, Style::GridTrackSizingDirection::Columns);
if (gridAreaIsIndefinite)
return direction == gridItemInlineDirection ? std::make_optional(std::max(gridItem.maxPreferredLogicalWidth(), gridAreaSize)) : std::nullopt;
return gridAreaSize;
}
static LayoutUnit computeGridSpanSize(const Vector<UniqueRef<GridTrack>>& tracks, const GridSpan& gridSpan, const std::optional<LayoutUnit> gridItemOffset, const LayoutUnit totalGuttersSize)
{
LayoutUnit totalTracksSize;
for (auto trackPosition : gridSpan)
totalTracksSize += tracks[trackPosition]->baseSize();
return totalTracksSize + totalGuttersSize + ((gridSpan.integerSpan() - 1) * gridItemOffset.value_or(0_lu));
}
std::optional<LayoutUnit> GridTrackSizingAlgorithm::gridAreaBreadthForGridItem(const RenderBox& gridItem, Style::GridTrackSizingDirection direction) const
{
// FIXME: These checks only works if we have precomputed logical width/height of the grid, which is not guaranteed.
if (m_renderGrid->areMasonryColumns() && direction == Style::GridTrackSizingDirection::Columns)
return m_renderGrid->contentBoxLogicalWidth();
if (m_renderGrid->areMasonryRows() && direction == Style::GridTrackSizingDirection::Rows && !GridLayoutFunctions::isOrthogonalGridItem(*m_renderGrid, gridItem))
return m_renderGrid->contentBoxLogicalHeight();
bool addContentAlignmentOffset =
direction == Style::GridTrackSizingDirection::Columns && (m_sizingState == SizingState::RowSizingFirstIteration || m_sizingState == SizingState::RowSizingExtraIterationForSizeContainment);
// To determine the column track's size based on an orthogonal grid item we need it's logical
// height, which may depend on the row track's size. It's possible that the row tracks sizing
// logic has not been performed yet, so we will need to do an estimation.
if (direction == Style::GridTrackSizingDirection::Rows && (m_sizingState == SizingState::ColumnSizingFirstIteration || m_sizingState == SizingState::ColumnSizingSecondIteration) && !m_renderGrid->areMasonryColumns()) {
if (m_sizingState == SizingState::ColumnSizingFirstIteration) {
auto spannedRowsSize = estimatedGridAreaBreadthForGridItem(gridItem, Style::GridTrackSizingDirection::Rows);
if (spannedRowsSize) {
if (auto availableLogicalHeight = m_renderGrid->availableLogicalHeightForContentBox(); availableLogicalHeight && hasAllLengthRowSizes()) {
auto contentDistributionForRows = m_renderGrid->computeContentPositionAndDistributionOffset(Style::GridTrackSizingDirection::Rows,
*availableLogicalHeight - *spannedRowsSize, m_renderGrid->numTracks(Style::GridTrackSizingDirection::Rows));
auto rowSpanForGridItem = m_renderGrid->gridSpanForGridItem(gridItem, Style::GridTrackSizingDirection::Rows);
return *spannedRowsSize + contentDistributionForRows.distributionOffset * (rowSpanForGridItem.integerSpan() - 1);
}
}
return spannedRowsSize;
}
addContentAlignmentOffset = true;
}
const GridSpan& span = m_renderGrid->gridSpanForGridItem(gridItem, direction);
return computeGridSpanSize(tracks(direction), span, addContentAlignmentOffset ? std::make_optional(m_renderGrid->gridItemOffset(direction)) : std::nullopt, m_renderGrid->guttersSize(direction, span.startLine(), span.integerSpan(), availableSpace(direction)));
}
bool GridTrackSizingAlgorithm::isIntrinsicSizedGridArea(const RenderBox& gridItem, Style::GridTrackSizingDirection gridAreaDirection) const
{
ASSERT(wasSetup());
const GridSpan& span = m_renderGrid->gridSpanForGridItem(gridItem, gridAreaDirection);
for (auto trackPosition : span) {
const auto& trackSize = GridLayoutFunctions::rawGridTrackSize(m_renderGrid->style(), gridAreaDirection, trackPosition, m_grid.autoRepeatTracks(gridAreaDirection), m_grid.explicitGridStart(gridAreaDirection));
// We consider fr units as 'auto' for the min sizing function.
// FIXME(jfernandez): https://github.com/w3c/csswg-drafts/issues/2611
//
// The use of AvailableSize function may imply different results
// for the same item when assuming indefinite or definite size
// constraints depending on the phase we evaluate the item's
// baseline participation.
// FIXME(jfernandez): https://github.com/w3c/csswg-drafts/issues/3046
if (trackSize.isContentSized() || trackSize.isFitContent() || trackSize.minTrackBreadth().isFlex() || (trackSize.maxTrackBreadth().isFlex() && !availableSpace(gridAreaDirection)))
return true;
}
return false;
}
Style::GridTrackSize GridTrackSizingAlgorithm::calculateGridTrackSize(Style::GridTrackSizingDirection direction, unsigned translatedIndex) const
{
ASSERT(wasSetup());
// Collapse empty auto repeat tracks if auto-fit.
if (m_grid.hasAutoRepeatEmptyTracks(direction) && m_grid.isEmptyAutoRepeatTrack(direction, translatedIndex))
return 0_css_px;
auto& trackSize = GridLayoutFunctions::rawGridTrackSize(m_renderGrid->style(), direction, translatedIndex, m_grid.autoRepeatTracks(direction), m_grid.explicitGridStart(direction));
if (trackSize.isFitContent()) {
if (GridLayoutFunctions::isRelativeGridTrackBreadthAsAuto(trackSize.fitContentTrackLength(), availableSpace(direction)))
return Style::GridTrackSize::MinMax { CSS::Keyword::Auto { }, CSS::Keyword::MaxContent { } };
return trackSize;
}
auto minTrackBreadth = trackSize.minTrackBreadth();
auto maxTrackBreadth = trackSize.maxTrackBreadth();
// If the logical width/height of the grid container is indefinite, percentage
// values are treated as <auto>.
if (GridLayoutFunctions::isRelativeGridTrackBreadthAsAuto(trackSize.minTrackBreadth(), availableSpace(direction)))
minTrackBreadth = CSS::Keyword::Auto { };
if (GridLayoutFunctions::isRelativeGridTrackBreadthAsAuto(trackSize.maxTrackBreadth(), availableSpace(direction)))
maxTrackBreadth = CSS::Keyword::Auto { };
// Flex sizes are invalid as a min sizing function. However we still can have a flexible |minTrackBreadth|
// if the track size is just a flex size (e.g. "1fr"), the spec says that in this case it implies an automatic minimum.
if (minTrackBreadth.isFlex())
minTrackBreadth = CSS::Keyword::Auto { };
return Style::GridTrackSize::MinMax { WTF::move(minTrackBreadth), WTF::move(maxTrackBreadth) };
}
double GridTrackSizingAlgorithm::computeFlexFactorUnitSize(const Vector<UniqueRef<GridTrack>>& tracks, double flexFactorSum, LayoutUnit& leftOverSpace, const Vector<unsigned, 8>& flexibleTracksIndexes, std::unique_ptr<TrackIndexSet> tracksToTreatAsInflexible) const
{
// We want to avoid the effect of flex factors sum below 1 making the factor unit size to grow exponentially.
double hypotheticalFactorUnitSize = leftOverSpace / std::max<double>(1, flexFactorSum);
// product of the hypothetical "flex factor unit" and any flexible track's "flex factor" must be grater than such track's "base size".
bool validFlexFactorUnit = true;
for (auto index : flexibleTracksIndexes) {
if (tracksToTreatAsInflexible && tracksToTreatAsInflexible->contains(index))
continue;
auto baseSize = tracks[index]->baseSize();
auto flexFactor = tracks[index]->cachedTrackSize().maxTrackBreadth().flex().value;
// treating all such tracks as inflexible.
if (baseSize > hypotheticalFactorUnitSize * flexFactor) {
leftOverSpace -= baseSize;
flexFactorSum -= flexFactor;
if (!tracksToTreatAsInflexible)
tracksToTreatAsInflexible = makeUnique<TrackIndexSet>();
tracksToTreatAsInflexible->add(index);
validFlexFactorUnit = false;
}
}
if (!validFlexFactorUnit)
return computeFlexFactorUnitSize(tracks, flexFactorSum, leftOverSpace, flexibleTracksIndexes, WTF::move(tracksToTreatAsInflexible));
return hypotheticalFactorUnitSize;
}
void GridTrackSizingAlgorithm::computeFlexSizedTracksGrowth(double flexFraction, Vector<LayoutUnit>& increments, LayoutUnit& totalGrowth) const
{
size_t numFlexTracks = m_flexibleSizedTracksIndex.size();
ASSERT(increments.size() == numFlexTracks);
auto& allTracks = tracks(m_direction);
// The flexFraction multiplied by the flex factor can result in a non-integer size. Since we floor the stretched size to fit in a LayoutUnit,
// we may lose the fractional part of the computation which can cause the entire free space not being distributed evenly. The leftover
// fractional part from every flexible track are accumulated here to avoid this issue.
double leftOverSize = 0;
for (size_t i = 0; i < numFlexTracks; ++i) {
unsigned trackIndex = m_flexibleSizedTracksIndex[i];
const auto& trackSize = allTracks[trackIndex]->cachedTrackSize();
ASSERT(trackSize.maxTrackBreadth().isFlex());
LayoutUnit oldBaseSize = allTracks[trackIndex]->baseSize();
auto frShare = flexFraction * trackSize.maxTrackBreadth().flex().value + leftOverSize;
auto stretchedSize = LayoutUnit(frShare);
LayoutUnit newBaseSize = std::max(oldBaseSize, stretchedSize);
increments[i] = newBaseSize - oldBaseSize;
totalGrowth += increments[i];
// In the case that stretchedSize is greater than frShare, we floor it to 0 to avoid a negative leftover.
leftOverSize = std::max(frShare - stretchedSize.toDouble(), 0.0);
}
}
double GridTrackSizingAlgorithm::findFrUnitSize(const GridSpan& tracksSpan, LayoutUnit leftOverSpace) const
{
if (leftOverSpace <= 0)
return 0;
auto& allTracks = tracks(m_direction);
double flexFactorSum = 0;
Vector<unsigned, 8> flexibleTracksIndexes;
for (auto trackIndex : tracksSpan) {
const auto& trackSize = allTracks[trackIndex]->cachedTrackSize();
if (!trackSize.maxTrackBreadth().isFlex())
leftOverSpace -= allTracks[trackIndex]->baseSize();
else {
auto flexFactor = trackSize.maxTrackBreadth().flex().value;
flexibleTracksIndexes.append(trackIndex);
flexFactorSum += flexFactor;
}
}
// We don't remove the gutters from left_over_space here, because that was already done before.
// The function is not called if we don't have <flex> grid tracks.
ASSERT(!flexibleTracksIndexes.isEmpty());
return computeFlexFactorUnitSize(allTracks, flexFactorSum, leftOverSpace, flexibleTracksIndexes);
}
void GridTrackSizingAlgorithm::computeGridContainerIntrinsicSizes()
{
if (m_direction == Style::GridTrackSizingDirection::Columns && m_strategy->isComputingSizeOrInlineSizeContainment()) {
if (auto size = m_renderGrid->explicitIntrinsicInnerLogicalSize(m_direction)) {
m_minContentSize = size.value();
m_maxContentSize = size.value();
return;
}
}
m_minContentSize = m_maxContentSize = 0_lu;
bool hasAutoRepeatFitTracks = m_renderGrid->autoRepeatType(m_direction) == AutoRepeatType::Fit;
auto autoRepeatTracksRange = m_renderGrid->autoRepeatTracksRange(m_direction);
Vector<UniqueRef<GridTrack>>& allTracks = tracks(m_direction);
for (size_t trackIndex = 0; trackIndex < allTracks.size(); ++trackIndex) {
auto& track = allTracks[trackIndex];
ASSERT(m_strategy->isComputingSizeOrInlineSizeContainment() || !track->infiniteGrowthPotential());
if (m_strategy->isComputingSizeOrInlineSizeContainment() && hasAutoRepeatFitTracks && autoRepeatTracksRange.contains(trackIndex))
continue;
m_minContentSize += track->baseSize();
m_maxContentSize += track->growthLimitIsInfinite() ? track->baseSize() : track->growthLimit();
// The growth limit caps must be cleared now in order to properly sort
// tracks by growth potential on an eventual "Maximize Tracks".
track->setGrowthLimitCap(std::nullopt);
}
}