chromium/third_party/blink/renderer/platform/fonts/shaping/shaping_line_breaker.h

// Copyright 2017 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_SHAPING_LINE_BREAKER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_SHAPING_LINE_BREAKER_H_

#include <optional>

#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/text_spacing_trim.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/text/text_direction.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"

namespace blink {

class Font;
class ShapeResult;
class ShapeResultView;
class Hyphenation;
class LazyLineBreakIterator;

// Shapes a line of text by finding the ideal break position as indicated by the
// available space and the shape results for the entire paragraph. Once an ideal
// break position has been found the text is scanned backwards until a valid and
// and appropriate break opportunity is identified. Unless the break opportunity
// is at a safe-to-break boundary (as identified by HarfBuzz) the beginning and/
// or end of the line is reshaped to account for differences caused by breaking.
//
// This allows for significantly faster and more efficient line breaking by only
// reshaping when absolutely necessarily and by only evaluating likely candidate
// break opportunities instead of measuring and evaluating all possible options.
class PLATFORM_EXPORT ShapingLineBreaker { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_SHAPING_SHAPING_LINE_BREAKER_H_