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// Copyright 2017 The Chromium 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 "third_party/blink/renderer/core/layout/ng/ng_text_decoration_offset.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_baseline.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_text_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/fonts/font_metrics.h"
namespace blink {
int NGTextDecorationOffset::ComputeUnderlineOffsetForUnder(
float text_decoration_thickness,
FontVerticalPositionType position_type) const {
LayoutUnit offset = LayoutUnit::Max();
const ComputedStyle& style = text_fragment_.Style();
FontBaseline baseline_type = style.GetFontBaseline();
if (decorating_box_) {
// TODO(eae): Replace with actual baseline once available.
NGBaselineRequest baseline_request = {
NGBaselineAlgorithmType::kAtomicInline,
FontBaseline::kIdeographicBaseline};
if (base::Optional<LayoutUnit> baseline =
decorating_box_->Baseline(baseline_request))
offset = baseline.value();
}
if (offset == LayoutUnit::Max()) {
// TODO(layout-dev): How do we compute the baseline offset with a
// decorating_box?
const SimpleFontData* font_data = style.GetFont().PrimaryFont();
if (!font_data)
return 0;
offset = font_data->GetFontMetrics().Ascent(baseline_type) -
font_data->VerticalPosition(position_type, baseline_type);
}
// Compute offset to the farthest position of the decorating box.
// TODO(layout-dev): This does not take farthest offset within the decorating
// box into account, only the position within this text fragment.
int offset_int = offset.Floor();
// Gaps are not needed for TextTop because it generally has internal
// leadings.
if (position_type == FontVerticalPositionType::TextTop)
return offset_int;
return !IsLineOverSide(position_type) ? offset_int + 1 : offset_int - 1;
}
} // namespace blink
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