run_metrics.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_TXT_SRC_TXT_RUN_METRICS_H_
#define FLUTTER_TXT_SRC_TXT_RUN_METRICS_H_
 
#include "text_style.h"
#include "third_party/skia/include/core/SkFontMetrics.h"
 
namespace txt {
 
// Contains the font metrics and TextStyle of a unique run.
class RunMetrics {
 public:
  explicit RunMetrics(const TextStyle* style) : text_style(style) {}
 
  RunMetrics(const TextStyle* style, const SkFontMetrics& metrics)
      : text_style(style), font_metrics(metrics) {}
 
  const TextStyle* text_style;
 
  // SkFontMetrics contains the following metrics:
  //
  // * Top                 distance to reserve above baseline
  // * Ascent              distance to reserve below baseline
  // * Descent             extent below baseline
  // * Bottom              extent below baseline
  // * Leading             distance to add between lines
  // * AvgCharWidth        average character width
  // * MaxCharWidth        maximum character width
  // * XMin                minimum x
  // * XMax                maximum x
  // * XHeight             height of lower-case 'x'
  // * CapHeight           height of an upper-case letter
  // * UnderlineThickness  underline thickness
  // * UnderlinePosition   underline position relative to baseline
  // * StrikeoutThickness  strikeout thickness
  // * StrikeoutPosition   strikeout position relative to baseline
  SkFontMetrics font_metrics;
};
 
}  // namespace txt
 
#endif  // FLUTTER_TXT_SRC_TXT_RUN_METRICS_H_