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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_RANGE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_RANGE_H_
#include "third_party/blink/renderer/platform/fonts/shaping/glyph_data.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/heap/visitor.h"
namespace blink {
struct ShapeResultRun;
// Represents a range of HarfBuzzRunGlyphData. |begin| and |end| follow the
// iterator pattern; i.e., |begin| is lower or equal to |end| in the address
// space regardless of LTR/RTL. |begin| is inclusive, |end| is exclusive.
class PLATFORM_EXPORT GlyphDataRange {
DISALLOW_NEW();
public:
GlyphDataRange() = default;
explicit GlyphDataRange(const ShapeResultRun&);
unsigned size() const { return size_; }
bool IsEmpty() const { return !size_; }
// The `span` of `HarfBuzzRunGlyphData`.
base::span<const HarfBuzzRunGlyphData> Glyphs() const;
using const_iterator = const HarfBuzzRunGlyphData*;
const_iterator begin() const;
const_iterator end() const;
bool HasOffsets() const;
// The `span` of `GlyphOffset` if `HasOffsets()`, or an empty span.
base::span<const GlyphOffset> Offsets() const;
void Trace(Visitor*) const;
GlyphDataRange FindGlyphDataRange(bool is_rtl,
unsigned start_character_index,
unsigned end_character_index) const;
private:
GlyphDataRange(const GlyphDataRange&,
const_iterator begin,
const_iterator end);
Member<const ShapeResultRun> run_;
wtf_size_t index_ = 0;
wtf_size_t size_ = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_GLYPH_DATA_RANGE_H_
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