chromium/third_party/blink/renderer/core/layout/inline/justification_utils.cc

// Copyright 2016 The Chromium Authors
// 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/inline/justification_utils.h"

#include "third_party/blink/renderer/core/layout/inline/inline_item_result_ruby_column.h"
#include "third_party/blink/renderer/core/layout/inline/line_info.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_spacing.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_view.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"

namespace blink {

namespace {

constexpr UChar kTextCombineItemMarker = …;  // U+3042 Hiragana Letter A

// Build the source text for ShapeResultSpacing. This needs special handling
// for text-combine items, ruby annotations, and hyphenations.
String BuildJustificationText(const String& text_content,
                              const InlineItemResults& results,
                              unsigned line_text_start_offset,
                              unsigned end_offset,
                              bool may_have_text_combine_or_ruby) { … }

// This function returns spacing amount on the right of the last glyph.
// It's zero if the last item is an atomic-inline.
float JustifyResults(const String& text_content,
                     const String& line_text,
                     unsigned line_text_start_offset,
                     ShapeResultSpacing<String>& spacing,
                     InlineItemResults& results) { … }

class ExpandableItemsFinder { … };

void ApplyLeftAndRightExpansion(LayoutUnit left_expansion,
                                LayoutUnit right_expansion,
                                LogicalLineItem& item) { … }

std::optional<LayoutUnit> ApplyJustificationInternal(
    LayoutUnit space,
    JustificationTarget target,
    const LineInfo& line_info,
    InlineItemResults* results) { … }

}  // namespace

std::optional<LayoutUnit> ApplyJustification(LayoutUnit space,
                                             JustificationTarget target,
                                             LineInfo* line_info) { … }

std::optional<LayoutUnit> ComputeRubyBaseInset(LayoutUnit space,
                                               const LineInfo& line_info) { … }

bool ApplyLeftAndRightExpansion(LayoutUnit left_expansion,
                                LayoutUnit right_expansion,
                                base::span<LogicalLineItem> items) { … }

}  // namespace blink