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// Copyright 2014 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/text_decoration_offset.h"
#include "third_party/blink/renderer/core/layout/line/inline_text_box.h"
#include "third_party/blink/renderer/core/layout/line/root_inline_box.h"
#include "third_party/blink/renderer/platform/fonts/font_metrics.h"
namespace blink {
int TextDecorationOffset::ComputeUnderlineOffsetForUnder(
float text_decoration_thickness,
FontVerticalPositionType position_type) const {
const RootInlineBox& root = inline_text_box_->Root();
FontBaseline baseline_type = root.BaselineType();
LayoutUnit offset = inline_text_box_->OffsetTo(position_type, baseline_type);
// Compute offset to the farthest position of the decorating box.
LayoutUnit logical_top = inline_text_box_->LogicalTop();
LayoutUnit position = logical_top + offset;
LayoutUnit farthest = root.FarthestPositionForUnderline(
decorating_box_, position_type, baseline_type, position);
// Round() looks more logical but Floor() produces better results in
// positive/negative offsets, in horizontal/vertical flows, on Win/Mac/Linux.
int offset_int = (farthest - logical_top).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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