lib/ui/text/line_metrics.cc

// 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.

#include "flutter/lib/ui/text/line_metrics.h"

#include "flutter/fml/logging.h"
#include "third_party/tonic/dart_class_library.h"
#include "third_party/tonic/dart_state.h"
#include "third_party/tonic/logging/dart_error.h"

using namespace flutter;

namespace tonic {

namespace {

Dart_Handle GetLineMetricsType() {
  DartClassLibrary& class_library = DartState::Current()->class_library();
  Dart_Handle type =
      Dart_HandleFromPersistent(class_library.GetClass("ui", "LineMetrics"));
  FML_DCHECK(!LogIfError(type));
  return type;
}

}  // anonymous namespace

Dart_Handle DartConverter<flutter::LineMetrics>::ToDart(
    const flutter::LineMetrics& val) {
  constexpr int argc = 9;

  Dart_Handle argv[argc] = {
      tonic::ToDart(*val.hard_break), tonic::ToDart(*val.ascent),
      tonic::ToDart(*val.descent), tonic::ToDart(*val.unscaled_ascent),
      // We add then round to get the height. The
      // definition of height here is different
      // than the one in LibTxt.
      tonic::ToDart(round(*val.ascent + *val.descent)),
      tonic::ToDart(*val.width), tonic::ToDart(*val.left),
      tonic::ToDart(*val.baseline), tonic::ToDart(*val.line_number)};
  return Dart_New(GetLineMetricsType(), tonic::ToDart("_"), argc, argv);
}

Dart_Handle DartListFactory<flutter::LineMetrics>::NewList(intptr_t length) {
  return Dart_NewListOfType(GetLineMetricsType(), length);
}

}  // namespace tonic