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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/layout/ng/inline/ng_inline_break_token.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_relative_utils.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
namespace {
struct SameSizeAsNGPhysicalLineBoxFragment : NGPhysicalContainerFragment {
void* pointer;
NGLineHeightMetrics metrics;
};
static_assert(sizeof(NGPhysicalLineBoxFragment) ==
sizeof(SameSizeAsNGPhysicalLineBoxFragment),
"NGPhysicalLineBoxFragment should stay small");
} // 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(NGLinkStorage),
::WTF::GetStringWithTypeName<NGPhysicalLineBoxFragment>());
new (data) NGPhysicalLineBoxFragment(builder);
return base::AdoptRef(static_cast<NGPhysicalLineBoxFragment*>(data));
}
NGPhysicalLineBoxFragment::NGPhysicalLineBoxFragment(
NGLineBoxFragmentBuilder* builder)
: NGPhysicalContainerFragment(builder,
builder->GetWritingMode(),
children_,
kFragmentLineBox,
builder->line_box_type_),
metrics_(builder->metrics_) {
style_ = std::move(builder->style_);
base_direction_ = static_cast<unsigned>(builder->base_direction_);
}
NGLineHeightMetrics NGPhysicalLineBoxFragment::BaselineMetrics(
FontBaseline) 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_;
}
NGPhysicalOffsetRect NGPhysicalLineBoxFragment::ScrollableOverflow(
const LayoutObject* container,
const ComputedStyle* container_style,
NGPhysicalSize container_physical_size) const {
WritingMode container_writing_mode = container_style->GetWritingMode();
TextDirection container_direction = container_style->Direction();
NGPhysicalOffsetRect overflow({}, Size());
for (const auto& child : Children()) {
NGPhysicalOffsetRect child_scroll_overflow =
child->ScrollableOverflowForPropagation(container);
child_scroll_overflow.offset += child.Offset();
// If child has the same style as parent, parent will compute relative
// offset.
if (&child->Style() != container_style) {
child_scroll_overflow.offset +=
ComputeRelativeOffset(child->Style(), container_writing_mode,
container_direction, container_physical_size);
}
overflow.Unite(child_scroll_overflow);
}
return overflow;
}
const NGPhysicalFragment* NGPhysicalLineBoxFragment::FirstLogicalLeaf() const {
if (Children().IsEmpty())
return nullptr;
// TODO(xiaochengh): This isn't correct for mixed Bidi. Fix it. Besides, we
// should compute and store it during layout.
const TextDirection direction = Style().Direction();
const NGPhysicalFragment* runner = this;
while (const auto* runner_as_container =
DynamicTo<NGPhysicalContainerFragment>(runner)) {
if (runner->IsBlockFormattingContextRoot())
break;
if (runner_as_container->Children().IsEmpty())
break;
runner = direction == TextDirection::kLtr
? runner_as_container->Children().front().get()
: runner_as_container->Children().back().get();
}
DCHECK_NE(runner, this);
return runner;
}
const NGPhysicalFragment* NGPhysicalLineBoxFragment::LastLogicalLeaf() const {
if (Children().IsEmpty())
return nullptr;
// TODO(xiaochengh): This isn't correct for mixed Bidi. Fix it. Besides, we
// should compute and store it during layout.
const TextDirection direction = Style().Direction();
const NGPhysicalFragment* runner = this;
while (const auto* runner_as_container =
DynamicTo<NGPhysicalContainerFragment>(runner)) {
if (runner->IsBlockFormattingContextRoot())
break;
if (runner_as_container->Children().IsEmpty())
break;
runner = direction == TextDirection::kLtr
? runner_as_container->Children().back().get()
: runner_as_container->Children().front().get();
}
DCHECK_NE(runner, this);
return runner;
}
bool NGPhysicalLineBoxFragment::HasSoftWrapToNextLine() const {
const auto& break_token = To<NGInlineBreakToken>(*BreakToken());
return !break_token.IsFinished() && !break_token.IsForcedBreak();
}
NGPhysicalOffset NGPhysicalLineBoxFragment::LineStartPoint() const {
const NGLogicalOffset logical_start; // (0, 0)
const NGPhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
return logical_start.ConvertToPhysical(Style().GetWritingMode(),
BaseDirection(), Size(), pixel_size);
}
NGPhysicalOffset NGPhysicalLineBoxFragment::LineEndPoint() const {
const LayoutUnit inline_size =
NGFragment(Style().GetWritingMode(), *this).InlineSize();
const NGLogicalOffset logical_end(inline_size, LayoutUnit());
const NGPhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
return logical_end.ConvertToPhysical(Style().GetWritingMode(),
BaseDirection(), Size(), pixel_size);
}
} // namespace blink
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