| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "core/layout/ng/inline/ng_inline_node.h" |
| |
| #include <algorithm> |
| #include <limits> |
| #include <memory> |
| #include <utility> |
| |
| #include "core/layout/LayoutObject.h" |
| #include "core/layout/LayoutText.h" |
| #include "core/layout/LayoutTextFragment.h" |
| #include "core/layout/ng/inline/ng_bidi_paragraph.h" |
| #include "core/layout/ng/inline/ng_inline_break_token.h" |
| #include "core/layout/ng/inline/ng_inline_item.h" |
| #include "core/layout/ng/inline/ng_inline_items_builder.h" |
| #include "core/layout/ng/inline/ng_inline_layout_algorithm.h" |
| #include "core/layout/ng/inline/ng_line_box_fragment.h" |
| #include "core/layout/ng/inline/ng_line_breaker.h" |
| #include "core/layout/ng/inline/ng_offset_mapping.h" |
| #include "core/layout/ng/inline/ng_physical_line_box_fragment.h" |
| #include "core/layout/ng/inline/ng_physical_text_fragment.h" |
| #include "core/layout/ng/inline/ng_text_fragment.h" |
| #include "core/layout/ng/layout_ng_block_flow.h" |
| #include "core/layout/ng/layout_ng_list_item.h" |
| #include "core/layout/ng/legacy_layout_tree_walking.h" |
| #include "core/layout/ng/ng_box_fragment.h" |
| #include "core/layout/ng/ng_constraint_space_builder.h" |
| #include "core/layout/ng/ng_fragment_builder.h" |
| #include "core/layout/ng/ng_fragmentation_utils.h" |
| #include "core/layout/ng/ng_layout_result.h" |
| #include "core/layout/ng/ng_length_utils.h" |
| #include "core/layout/ng/ng_physical_box_fragment.h" |
| #include "core/layout/ng/ng_positioned_float.h" |
| #include "core/style/ComputedStyle.h" |
| #include "platform/fonts/shaping/HarfBuzzShaper.h" |
| #include "platform/fonts/shaping/ShapeResultSpacing.h" |
| #include "platform/runtime_enabled_features.h" |
| #include "platform/wtf/text/CharacterNames.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| // Templated helper function for CollectInlinesInternal(). |
| template <typename OffsetMappingBuilder> |
| void ClearNeedsLayoutIfUpdatingLayout(LayoutObject* node) { |
| node->ClearNeedsLayout(); |
| node->ClearNeedsCollectInlines(); |
| } |
| |
| template <> |
| void ClearNeedsLayoutIfUpdatingLayout<NGOffsetMappingBuilder>(LayoutObject*) {} |
| |
| // Templated helper function for CollectInlinesInternal(). |
| // TODO(layout-dev): Remove this function once LayoutNGPaintFragments is enabled |
| // by default. |
| template <typename OffsetMappingBuilder> |
| String GetTextForInlineCollection(const LayoutText& node) { |
| return node.GetText(); |
| } |
| |
| template <> |
| String GetTextForInlineCollection<NGOffsetMappingBuilder>( |
| const LayoutText& layout_text) { |
| if (RuntimeEnabledFeatures::LayoutNGPaintFragmentsEnabled()) |
| return layout_text.GetText(); |
| |
| // The code below is a workaround of writing the whitespace-collapsed string |
| // back to LayoutText after inline collection, so that we can still recover |
| // the original text for building offset mapping. |
| if (layout_text.Style()->TextSecurity() != ETextSecurity::kNone) |
| return layout_text.GetText(); |
| |
| // TODO(xiaochengh): Return the text-transformed string instead of DOM data |
| // string. |
| |
| // Special handling for first-letter. |
| if (layout_text.IsTextFragment()) { |
| const LayoutTextFragment& text_fragment = ToLayoutTextFragment(layout_text); |
| Text* node = text_fragment.AssociatedTextNode(); |
| if (!node) { |
| // Reaches here if the LayoutTextFragment is due to a LayoutQuote. |
| return layout_text.GetText(); |
| } |
| return node->data().Substring(text_fragment.Start(), |
| text_fragment.FragmentLength()); |
| } |
| |
| Node* node = layout_text.GetNode(); |
| if (!node || !node->IsTextNode()) |
| return layout_text.GetText(); |
| return ToText(node)->data(); |
| } |
| |
| // The function is templated to indicate the purpose of collected inlines: |
| // - With EmptyOffsetMappingBuilder: updating layout; |
| // - With NGOffsetMappingBuilder: building offset mapping on clean layout. |
| // |
| // This allows code sharing between the two purposes with slightly different |
| // behaviors. For example, we clear a LayoutObject's need layout flags when |
| // updating layout, but don't do that when building offset mapping. |
| // |
| // There are also performance considerations, since template saves the overhead |
| // for condition checking and branching. |
| template <typename OffsetMappingBuilder> |
| void CollectInlinesInternal( |
| LayoutBlockFlow* block, |
| NGInlineItemsBuilderTemplate<OffsetMappingBuilder>* builder) { |
| builder->EnterBlock(block->Style()); |
| LayoutObject* node = GetLayoutObjectForFirstChildNode(block); |
| while (node) { |
| if (node->IsText()) { |
| LayoutText* layout_text = ToLayoutText(node); |
| if (UNLIKELY(layout_text->IsWordBreak())) { |
| builder->AppendBreakOpportunity(node->Style(), layout_text); |
| } else { |
| builder->SetIsSVGText(node->IsSVGInlineText()); |
| const String& text = |
| GetTextForInlineCollection<OffsetMappingBuilder>(*layout_text); |
| builder->Append(text, node->Style(), layout_text); |
| } |
| ClearNeedsLayoutIfUpdatingLayout<OffsetMappingBuilder>(layout_text); |
| |
| |
| } else if (node->IsFloating()) { |
| // Add floats and positioned objects in the same way as atomic inlines. |
| // Because these objects need positions, they will be handled in |
| // NGInlineLayoutAlgorithm. |
| builder->AppendOpaque(NGInlineItem::kFloating, |
| kObjectReplacementCharacter, nullptr, node); |
| |
| } else if (node->IsOutOfFlowPositioned()) { |
| builder->AppendOpaque(NGInlineItem::kOutOfFlowPositioned, nullptr, node); |
| |
| } else if (node->IsAtomicInlineLevel()) { |
| if (LayoutNGListItem::IsListMarker(node)) { |
| // LayoutNGListItem produces the 'outside' list marker as an inline |
| // block. This is an out-of-flow item whose position is computed |
| // automatically. |
| builder->AppendOpaque(NGInlineItem::kListMarker, node->Style(), node); |
| } else { |
| // For atomic inlines add a unicode "object replacement character" to |
| // signal the presence of a non-text object to the unicode bidi |
| // algorithm. |
| builder->AppendAtomicInline(node->Style(), node); |
| } |
| |
| } else { |
| // Because we're collecting from LayoutObject tree, block-level children |
| // should not appear. LayoutObject tree should have created an anonymous |
| // box to prevent having inline/block-mixed children. |
| DCHECK(node->IsInline()); |
| |
| builder->EnterInline(node); |
| |
| // Traverse to children if they exist. |
| if (LayoutObject* child = node->SlowFirstChild()) { |
| node = child; |
| continue; |
| |
| } else { |
| // An empty inline node. |
| ClearNeedsLayoutIfUpdatingLayout<OffsetMappingBuilder>(node); |
| } |
| |
| builder->ExitInline(node); |
| } |
| |
| // Find the next sibling, or parent, until we reach |block|. |
| while (true) { |
| if (LayoutObject* next = node->NextSibling()) { |
| node = next; |
| break; |
| } |
| node = GetLayoutObjectForParentNode(node); |
| if (node == block) { |
| // Set |node| to |nullptr| to break out of the outer loop. |
| node = nullptr; |
| break; |
| } |
| DCHECK(node->IsInline()); |
| builder->ExitInline(node); |
| ClearNeedsLayoutIfUpdatingLayout<OffsetMappingBuilder>(node); |
| } |
| } |
| builder->ExitBlock(); |
| } |
| |
| } // namespace |
| |
| NGInlineNode::NGInlineNode(LayoutBlockFlow* block) |
| : NGLayoutInputNode(block, kInline) { |
| DCHECK(block); |
| DCHECK(block->IsLayoutNGMixin()); |
| if (!block->HasNGInlineNodeData()) |
| block->ResetNGInlineNodeData(); |
| } |
| |
| bool NGInlineNode::InLineHeightQuirksMode() const { |
| return GetDocument().InLineHeightQuirksMode(); |
| } |
| |
| NGInlineNodeData* NGInlineNode::MutableData() { |
| return ToLayoutBlockFlow(box_)->GetNGInlineNodeData(); |
| } |
| |
| bool NGInlineNode::IsPrepareLayoutFinished() const { |
| const NGInlineNodeData* data = ToLayoutBlockFlow(box_)->GetNGInlineNodeData(); |
| return data && !data->text_content_.IsNull(); |
| } |
| |
| const NGInlineNodeData& NGInlineNode::Data() const { |
| DCHECK(IsPrepareLayoutFinished() && |
| !GetLayoutBlockFlow()->NeedsCollectInlines()); |
| return *ToLayoutBlockFlow(box_)->GetNGInlineNodeData(); |
| } |
| |
| const Vector<NGInlineItem>& NGInlineNode::Items(bool is_first_line) const { |
| const NGInlineNodeData& data = Data(); |
| if (!is_first_line || !data.first_line_items_) |
| return data.items_; |
| return *data.first_line_items_; |
| } |
| |
| NGInlineItemRange NGInlineNode::Items(unsigned start, unsigned end) { |
| return NGInlineItemRange(&MutableData()->items_, start, end); |
| } |
| |
| void NGInlineNode::InvalidatePrepareLayout() { |
| GetLayoutBlockFlow()->ResetNGInlineNodeData(); |
| DCHECK(!IsPrepareLayoutFinished()); |
| } |
| |
| void NGInlineNode::PrepareLayoutIfNeeded() { |
| LayoutBlockFlow* block_flow = GetLayoutBlockFlow(); |
| if (IsPrepareLayoutFinished()) { |
| if (!block_flow->NeedsCollectInlines()) |
| return; |
| |
| block_flow->ResetNGInlineNodeData(); |
| } |
| |
| // Scan list of siblings collecting all in-flow non-atomic inlines. A single |
| // NGInlineNode represent a collection of adjacent non-atomic inlines. |
| NGInlineNodeData* data = MutableData(); |
| DCHECK(data); |
| CollectInlines(data); |
| SegmentText(data); |
| ShapeText(data); |
| DCHECK_EQ(data, MutableData()); |
| |
| block_flow->ClearNeedsCollectInlines(); |
| |
| #if DCHECK_IS_ON() |
| // ComputeOffsetMappingIfNeeded() runs some integrity checks as part of |
| // creating offset mapping. Run the check, and discard the result. |
| DCHECK(!data->offset_mapping_); |
| ComputeOffsetMappingIfNeeded(); |
| DCHECK(data->offset_mapping_); |
| data->offset_mapping_.reset(); |
| #endif |
| } |
| |
| const NGInlineNodeData& NGInlineNode::EnsureData() { |
| PrepareLayoutIfNeeded(); |
| return Data(); |
| } |
| |
| const NGOffsetMapping* NGInlineNode::ComputeOffsetMappingIfNeeded() { |
| DCHECK(!GetLayoutBlockFlow()->GetDocument().NeedsLayoutTreeUpdate()); |
| |
| if (!Data().offset_mapping_) { |
| // TODO(xiaochengh): ComputeOffsetMappingIfNeeded() discards the |
| // NGInlineItems and text content built by |builder|, because they are |
| // already there in NGInlineNodeData. For efficiency, we should make |
| // |builder| not construct items and text content. |
| Vector<NGInlineItem> items; |
| NGInlineItemsBuilderForOffsetMapping builder(&items); |
| CollectInlinesInternal(GetLayoutBlockFlow(), &builder); |
| builder.ToString(); |
| |
| // TODO(xiaochengh): This doesn't compute offset mapping correctly when |
| // text-transform CSS property changes text length. |
| NGOffsetMappingBuilder& mapping_builder = builder.GetOffsetMappingBuilder(); |
| mapping_builder.SetDestinationString(Text()); |
| MutableData()->offset_mapping_ = |
| std::make_unique<NGOffsetMapping>(mapping_builder.Build()); |
| } |
| |
| return Data().offset_mapping_.get(); |
| } |
| |
| // Depth-first-scan of all LayoutInline and LayoutText nodes that make up this |
| // NGInlineNode object. Collects LayoutText items, merging them up into the |
| // parent LayoutInline where possible, and joining all text content in a single |
| // string to allow bidi resolution and shaping of the entire block. |
| void NGInlineNode::CollectInlines(NGInlineNodeData* data) { |
| DCHECK(data->text_content_.IsNull()); |
| DCHECK(data->items_.IsEmpty()); |
| LayoutBlockFlow* block = GetLayoutBlockFlow(); |
| block->WillCollectInlines(); |
| NGInlineItemsBuilder builder(&data->items_); |
| CollectInlinesInternal(block, &builder); |
| data->text_content_ = builder.ToString(); |
| // Set |is_bidi_enabled_| for all UTF-16 strings for now, because at this |
| // point the string may or may not contain RTL characters. |
| // |SegmentText()| will analyze the text and reset |is_bidi_enabled_| if it |
| // doesn't contain any RTL characters. |
| data->is_bidi_enabled_ = |
| !data->text_content_.Is8Bit() || builder.HasBidiControls(); |
| data->is_empty_inline_ = builder.IsEmptyInline(); |
| } |
| |
| void NGInlineNode::SegmentText(NGInlineNodeData* data) { |
| if (!data->is_bidi_enabled_) { |
| data->SetBaseDirection(TextDirection::kLtr); |
| return; |
| } |
| |
| NGBidiParagraph bidi; |
| data->text_content_.Ensure16Bit(); |
| if (!bidi.SetParagraph(data->text_content_, Style())) { |
| // On failure, give up bidi resolving and reordering. |
| data->is_bidi_enabled_ = false; |
| data->SetBaseDirection(TextDirection::kLtr); |
| return; |
| } |
| |
| data->SetBaseDirection(bidi.BaseDirection()); |
| |
| if (bidi.IsUnidirectional() && IsLtr(bidi.BaseDirection())) { |
| // All runs are LTR, no need to reorder. |
| data->is_bidi_enabled_ = false; |
| return; |
| } |
| |
| Vector<NGInlineItem>& items = data->items_; |
| unsigned item_index = 0; |
| for (unsigned start = 0; start < data->text_content_.length();) { |
| UBiDiLevel level; |
| unsigned end = bidi.GetLogicalRun(start, &level); |
| DCHECK_EQ(items[item_index].start_offset_, start); |
| item_index = NGInlineItem::SetBidiLevel(items, item_index, end, level); |
| start = end; |
| } |
| #if DCHECK_IS_ON() |
| // Check all items have bidi levels, except trailing non-length items. |
| // Items that do not create break opportunities such as kOutOfFlowPositioned |
| // do not have corresponding characters, and that they do not have bidi level |
| // assigned. |
| while (item_index < items.size() && !items[item_index].Length()) |
| item_index++; |
| DCHECK_EQ(item_index, items.size()); |
| #endif |
| } |
| |
| void NGInlineNode::ShapeText(NGInlineNodeData* data) { |
| // TODO(eae): Add support for shaping latin-1 text? |
| data->text_content_.Ensure16Bit(); |
| ShapeText(data->text_content_, &data->items_); |
| |
| ShapeTextForFirstLineIfNeeded(data); |
| } |
| |
| void NGInlineNode::ShapeText(const String& text_content, |
| Vector<NGInlineItem>* items) { |
| // Shape each item with the full context of the entire node. |
| HarfBuzzShaper shaper(text_content.Characters16(), text_content.length()); |
| ShapeResultSpacing<String> spacing(text_content); |
| for (unsigned index = 0; index < items->size();) { |
| NGInlineItem& start_item = (*items)[index]; |
| if (start_item.Type() != NGInlineItem::kText) { |
| index++; |
| continue; |
| } |
| |
| const Font& font = start_item.Style()->GetFont(); |
| TextDirection direction = start_item.Direction(); |
| unsigned end_index = index + 1; |
| unsigned end_offset = start_item.EndOffset(); |
| for (; end_index < items->size(); end_index++) { |
| const NGInlineItem& item = (*items)[end_index]; |
| if (item.Type() == NGInlineItem::kText) { |
| // Shape adjacent items together if the font and direction matches to |
| // allow ligatures and kerning to apply. |
| // TODO(kojii): Figure out the exact conditions under which this |
| // behavior is desirable. |
| if (font != item.Style()->GetFont() || direction != item.Direction()) |
| break; |
| end_offset = item.EndOffset(); |
| } else if (item.Type() == NGInlineItem::kOpenTag || |
| item.Type() == NGInlineItem::kCloseTag || |
| item.Type() == NGInlineItem::kOutOfFlowPositioned) { |
| // These items are opaque to shaping. |
| // Opaque items cannot have text, such as Object Replacement Characters, |
| // since such characters can affect shaping. |
| DCHECK_EQ(0u, item.Length()); |
| } else { |
| break; |
| } |
| } |
| |
| scoped_refptr<ShapeResult> shape_result = |
| shaper.Shape(&font, direction, start_item.StartOffset(), end_offset); |
| if (UNLIKELY(spacing.SetSpacing(font.GetFontDescription()))) |
| shape_result->ApplySpacing(spacing); |
| |
| // If the text is from one item, use the ShapeResult as is. |
| if (end_offset == start_item.EndOffset()) { |
| start_item.shape_result_ = std::move(shape_result); |
| index++; |
| continue; |
| } |
| |
| // If the text is from multiple items, split the ShapeResult to |
| // corresponding items. |
| for (; index < end_index; index++) { |
| NGInlineItem& item = (*items)[index]; |
| if (item.Type() != NGInlineItem::kText) |
| continue; |
| |
| // We don't use SafeToBreak API here because this is not a line break. |
| // The ShapeResult is broken into multiple results, but they must look |
| // like they were not broken. |
| // |
| // When multiple code units shape to one glyph, such as ligatures, the |
| // item that has its first code unit keeps the glyph. |
| item.shape_result_ = |
| shape_result->SubRange(item.StartOffset(), item.EndOffset()); |
| } |
| } |
| } |
| |
| // Create Vector<NGInlineItem> with :first-line rules applied if needed. |
| void NGInlineNode::ShapeTextForFirstLineIfNeeded(NGInlineNodeData* data) { |
| // First check if the document has any :first-line rules. |
| DCHECK(!data->first_line_items_); |
| LayoutObject* layout_object = GetLayoutObject(); |
| if (!layout_object->GetDocument().GetStyleEngine().UsesFirstLineRules()) |
| return; |
| |
| // Check if :first-line rules make any differences in the style. |
| const ComputedStyle* block_style = layout_object->Style(); |
| const ComputedStyle* first_line_style = layout_object->FirstLineStyle(); |
| if (block_style == first_line_style) |
| return; |
| |
| auto first_line_items = std::make_unique<Vector<NGInlineItem>>(); |
| first_line_items->AppendVector(data->items_); |
| for (auto& item : *first_line_items) { |
| if (item.style_) { |
| DCHECK(item.layout_object_); |
| item.style_ = item.layout_object_->FirstLineStyle(); |
| } |
| } |
| |
| // Re-shape if the font is different. |
| const Font& font = block_style->GetFont(); |
| const Font& first_line_font = first_line_style->GetFont(); |
| if (&font != &first_line_font && font != first_line_font) { |
| ShapeText(data->text_content_, first_line_items.get()); |
| } |
| |
| data->first_line_items_ = std::move(first_line_items); |
| } |
| |
| scoped_refptr<NGLayoutResult> NGInlineNode::Layout( |
| const NGConstraintSpace& constraint_space, |
| NGBreakToken* break_token) { |
| PrepareLayoutIfNeeded(); |
| |
| NGInlineLayoutAlgorithm algorithm(*this, constraint_space, |
| ToNGInlineBreakToken(break_token)); |
| return algorithm.Layout(); |
| } |
| |
| static LayoutUnit ComputeContentSize(NGInlineNode node, |
| NGLineBreakerMode mode) { |
| const ComputedStyle& style = node.Style(); |
| WritingMode writing_mode = style.GetWritingMode(); |
| LayoutUnit available_inline_size = |
| mode == NGLineBreakerMode::kMaxContent ? LayoutUnit::Max() : LayoutUnit(); |
| |
| scoped_refptr<NGConstraintSpace> space = |
| NGConstraintSpaceBuilder(writing_mode, node.InitialContainingBlockSize()) |
| .SetTextDirection(style.Direction()) |
| .SetAvailableSize({available_inline_size, NGSizeIndefinite}) |
| .ToConstraintSpace(writing_mode); |
| |
| Vector<NGPositionedFloat> positioned_floats; |
| Vector<scoped_refptr<NGUnpositionedFloat>> unpositioned_floats; |
| |
| scoped_refptr<NGInlineBreakToken> break_token; |
| NGLineInfo line_info; |
| NGExclusionSpace empty_exclusion_space; |
| NGLayoutOpportunity opportunity(NGBfcRect( |
| NGBfcOffset(), NGBfcOffset(available_inline_size, LayoutUnit::Max()))); |
| LayoutUnit result; |
| while (!break_token || !break_token->IsFinished()) { |
| unpositioned_floats.clear(); |
| |
| NGLineBreaker line_breaker(node, mode, *space, &positioned_floats, |
| &unpositioned_floats, &empty_exclusion_space, 0u, |
| break_token.get()); |
| if (!line_breaker.NextLine(opportunity, &line_info)) |
| break; |
| |
| break_token = line_breaker.CreateBreakToken(nullptr); |
| LayoutUnit inline_size = line_info.TextIndent(); |
| for (const NGInlineItemResult item_result : line_info.Results()) |
| inline_size += item_result.inline_size; |
| |
| // There should be no positioned floats while determining the min/max sizes. |
| DCHECK_EQ(positioned_floats.size(), 0u); |
| |
| // These variables are only used for the max-content calculation. |
| LayoutUnit floats_inline_size; |
| EFloat previous_float_type = EFloat::kNone; |
| |
| for (const auto& unpositioned_float : unpositioned_floats) { |
| NGBlockNode float_node = unpositioned_float->node; |
| const ComputedStyle& float_style = float_node.Style(); |
| |
| Optional<MinMaxSize> child_minmax; |
| if (NeedMinMaxSizeForContentContribution(float_style)) { |
| child_minmax = float_node.ComputeMinMaxSize(); |
| } |
| |
| MinMaxSize child_sizes = |
| ComputeMinAndMaxContentContribution(float_style, child_minmax); |
| LayoutUnit child_inline_margins = |
| ComputeMinMaxMargins(style, float_node).InlineSum(); |
| |
| if (mode == NGLineBreakerMode::kMinContent) { |
| result = std::max(result, child_sizes.min_size + child_inline_margins); |
| } else { |
| const EClear float_clear = float_style.Clear(); |
| |
| // If this float clears the previous float we start a new "line". |
| // This is subtly different to block layout which will only reset either |
| // the left or the right float size trackers. |
| if ((previous_float_type == EFloat::kLeft && |
| (float_clear == EClear::kBoth || float_clear == EClear::kLeft)) || |
| (previous_float_type == EFloat::kRight && |
| (float_clear == EClear::kBoth || float_clear == EClear::kRight))) { |
| result = std::max(result, inline_size + floats_inline_size); |
| floats_inline_size = LayoutUnit(); |
| } |
| |
| floats_inline_size += child_sizes.max_size + child_inline_margins; |
| previous_float_type = float_style.Floating(); |
| } |
| } |
| |
| // NOTE: floats_inline_size will be zero for the min-content calculation, |
| // and will just take the inline size of the un-breakable line. |
| result = std::max(result, inline_size + floats_inline_size); |
| } |
| |
| return result; |
| } |
| |
| MinMaxSize NGInlineNode::ComputeMinMaxSize() { |
| PrepareLayoutIfNeeded(); |
| |
| // Run line breaking with 0 and indefinite available width. |
| |
| // TODO(kojii): There are several ways to make this more efficient and faster |
| // than runnning two line breaking. |
| |
| // Compute the max of inline sizes of all line boxes with 0 available inline |
| // size. This gives the min-content, the width where lines wrap at every |
| // break opportunity. |
| MinMaxSize sizes; |
| sizes.min_size = ComputeContentSize(*this, NGLineBreakerMode::kMinContent); |
| |
| // Compute the sum of inline sizes of all inline boxes with no line breaks. |
| // TODO(kojii): NGConstraintSpaceBuilder does not allow NGSizeIndefinite |
| // inline available size. We can allow it, or make this more efficient |
| // without using NGLineBreaker. |
| sizes.max_size = ComputeContentSize(*this, NGLineBreakerMode::kMaxContent); |
| |
| // Negative text-indent can make min > max. Ensure min is the minimum size. |
| sizes.min_size = std::min(sizes.min_size, sizes.max_size); |
| |
| return sizes; |
| } |
| |
| // Compute the delta of text offsets between NGInlineNode and LayoutText. |
| // This map is needed to produce InlineTextBox since its offsets are to |
| // LayoutText. |
| // TODO(kojii): Since NGInlineNode has text after whitespace collapsed, the |
| // length may not match with LayoutText. This function updates LayoutText to |
| // match, but this needs more careful coding, if we keep copying to layoutobject |
| // tree. |
| void NGInlineNode::GetLayoutTextOffsets( |
| Vector<unsigned, 32>* text_offsets_out) const { |
| LayoutText* current_text = nullptr; |
| unsigned current_offset = 0; |
| const Vector<NGInlineItem>& items = Data().items_; |
| |
| for (unsigned i = 0; i < items.size(); i++) { |
| const NGInlineItem& item = items[i]; |
| LayoutObject* next_object = item.GetLayoutObject(); |
| LayoutText* next_text = next_object && next_object->IsText() |
| ? ToLayoutText(next_object) |
| : nullptr; |
| if (next_text != current_text) { |
| if (current_text && |
| current_text->TextLength() != item.StartOffset() - current_offset) { |
| current_text->SetTextInternal( |
| Text(current_offset, item.StartOffset()).ToString().Impl()); |
| } |
| current_text = next_text; |
| current_offset = item.StartOffset(); |
| } |
| (*text_offsets_out)[i] = current_offset; |
| } |
| if (current_text && current_text->TextLength() != |
| Data().text_content_.length() - current_offset) { |
| current_text->SetTextInternal( |
| Text(current_offset, Data().text_content_.length()).ToString().Impl()); |
| } |
| } |
| |
| void NGInlineNode::CheckConsistency() const { |
| #if DCHECK_IS_ON() |
| const Vector<NGInlineItem>& items = Data().items_; |
| for (const NGInlineItem& item : items) { |
| DCHECK(!item.GetLayoutObject() || !item.Style() || |
| item.Style() == item.GetLayoutObject()->Style()); |
| } |
| #endif |
| } |
| |
| String NGInlineNode::ToString() const { |
| return String::Format("NGInlineNode"); |
| } |
| |
| } // namespace blink |