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// Copyright 2017 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 "third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_break_token.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_cursor.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_line_box_fragment_builder.h"
#include "third_party/blink/renderer/core/layout/ng/ng_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_relative_utils.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/wtf/size_assertions.h"
namespace blink {
namespace {
struct SameSizeAsNGPhysicalLineBoxFragment : NGPhysicalContainerFragment {
FontHeight metrics;
};
ASSERT_SIZE(NGPhysicalLineBoxFragment, SameSizeAsNGPhysicalLineBoxFragment);
} // namespace
scoped_refptr<const NGPhysicalLineBoxFragment>
NGPhysicalLineBoxFragment::Create(NGLineBoxFragmentBuilder* builder) {
// We store the children list inline in the fragment as a flexible
// array. Therefore, we need to make sure to allocate enough space for
// that array here, which requires a manual allocation + placement new.
// The initialization of the array is done by NGPhysicalContainerFragment;
// we pass the buffer as a constructor argument.
void* data = ::WTF::Partitions::FastMalloc(
sizeof(NGPhysicalLineBoxFragment) +
builder->children_.size() * sizeof(NGLink),
::WTF::GetStringWithTypeName<NGPhysicalLineBoxFragment>());
new (data) NGPhysicalLineBoxFragment(PassKey(), builder);
return base::AdoptRef(static_cast<NGPhysicalLineBoxFragment*>(data));
}
NGPhysicalLineBoxFragment::NGPhysicalLineBoxFragment(
PassKey key,
NGLineBoxFragmentBuilder* builder)
: NGPhysicalContainerFragment(builder,
builder->GetWritingMode(),
children_,
kFragmentLineBox,
builder->line_box_type_),
metrics_(builder->metrics_) {
// A line box must have a metrics unless it's an empty line box.
DCHECK(!metrics_.IsEmpty() || IsEmptyLineBox());
base_or_resolved_direction_ = static_cast<unsigned>(builder->base_direction_);
has_hanging_ = builder->hang_inline_size_ != 0;
has_propagated_descendants_ = has_floating_descendants_for_paint_ ||
HasOutOfFlowPositionedDescendants() ||
builder->unpositioned_list_marker_;
}
FontHeight NGPhysicalLineBoxFragment::BaselineMetrics() const {
// TODO(kojii): Computing other baseline types than the used one is not
// implemented yet.
// TODO(kojii): We might need locale/script to look up OpenType BASE table.
return metrics_;
}
namespace {
// Include the inline-size of the line-box in the overflow.
// Do not update block offset and block size of |overflow|.
inline void AddInlineSizeToOverflow(const PhysicalRect& rect,
const WritingMode container_writing_mode,
PhysicalRect* overflow) {
PhysicalRect inline_rect;
inline_rect.offset = rect.offset;
if (IsHorizontalWritingMode(container_writing_mode)) {
inline_rect.size.width = rect.size.width;
inline_rect.offset.top = overflow->offset.top;
inline_rect.size.height = overflow->size.height;
} else {
inline_rect.size.height = rect.size.height;
inline_rect.offset.left = overflow->offset.left;
inline_rect.size.width = overflow->size.width;
}
overflow->UniteEvenIfEmpty(inline_rect);
}
} // namespace
PhysicalRect NGPhysicalLineBoxFragment::ScrollableOverflow(
const NGPhysicalBoxFragment& container,
const ComputedStyle& container_style,
TextHeightType height_type) const {
const WritingMode container_writing_mode = container_style.GetWritingMode();
PhysicalRect overflow;
for (const auto& child : PostLayoutChildren()) {
PhysicalRect child_scroll_overflow =
child->ScrollableOverflowForPropagation(container, height_type);
child_scroll_overflow.offset += child.Offset();
if (UNLIKELY(has_hanging_ && !child->IsFloatingOrOutOfFlowPositioned())) {
AdjustScrollableOverflowForHanging(LocalRect(), container_writing_mode,
&child_scroll_overflow);
}
overflow.Unite(child_scroll_overflow);
}
// Make sure we include the inline-size of the line-box in the overflow.
AddInlineSizeToOverflow(LocalRect(), container_writing_mode, &overflow);
return overflow;
}
PhysicalRect NGPhysicalLineBoxFragment::ScrollableOverflowForLine(
const NGPhysicalBoxFragment& container,
const ComputedStyle& container_style,
const NGFragmentItem& line,
const NGInlineCursor& cursor,
TextHeightType height_type) const {
DCHECK_EQ(&line, cursor.CurrentItem());
DCHECK_EQ(line.LineBoxFragment(), this);
PhysicalRect overflow;
AddScrollableOverflowForInlineChild(container, container_style, line,
has_hanging_, cursor, height_type,
&overflow);
// Make sure we include the inline-size of the line-box in the overflow.
// Note, the bottom half-leading should not be included. crbug.com/996847
const WritingMode container_writing_mode = container_style.GetWritingMode();
AddInlineSizeToOverflow(line.RectInContainerFragment(),
container_writing_mode, &overflow);
return overflow;
}
bool NGPhysicalLineBoxFragment::HasSoftWrapToNextLine() const {
const auto* break_token = To<NGInlineBreakToken>(BreakToken());
return break_token && !break_token->IsForcedBreak();
}
} // namespace blink
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