inline_item_segment.h | Explore in Territory

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_INLINE_INLINE_ITEM_SEGMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_INLINE_INLINE_ITEM_SEGMENT_H_

#include <unicode/ubidi.h>
#include <unicode/uscript.h>

#include "base/check_op.h"
#include "base/dcheck_is_on.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/inline/offset_mapping.h"
#include "third_party/blink/renderer/core/layout/style_variant.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/fonts/shaping/run_segmenter.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_options.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result.h"
#include "third_party/blink/renderer/platform/text/text_direction.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"

namespace blink {

class HarfBuzzShaper;
class InlineItem;

// Represents a segment produced by |RunSegmenter|.
//
// |RunSegmenter| is forward-only that this class provides random access to the
// result by keeping in memory. This class packs the data in a compact form to
// minimize the memory impact.
class CORE_EXPORT InlineItemSegment { … };

// Represents a set of |InlineItemSegment| for an inline formatting context
// represented by |InlineItemsData|.
//
// The segments/block ratio for Latin is 1.0 to 1.01 in average, while it
// increases to 1.01 to 1.05 for most other writing systems because it is common
// to have some Latin words within paragraphs.
//
// For writing systems that has multiple native scripts such as Japanese, the
// ratio jumps to 10-30, or sometimes 300 depends on the length of the block,
// because the average characters/segment ratio in Japanese is 2-5. This class
// builds internal indexes for faster access in such cases.
class CORE_EXPORT InlineItemSegments { … };

inline InlineItemSegments::Iterator::Iterator(unsigned start_offset,
                                              unsigned end_offset,
                                              const InlineItemSegment* segment)
    : … { … }

inline void InlineItemSegments::Iterator::operator++() { … }

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_INLINE_INLINE_ITEM_SEGMENT_H_
chromium/third_party/blink/renderer/core/layout/inline/inline_item_segment.h
