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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.
#ifndef NGBaseline_h
#define NGBaseline_h
#include "third_party/blink/renderer/platform/fonts/font_baseline.h"
#include "third_party/blink/renderer/platform/layout_unit.h"
namespace blink {
class LayoutBox;
class NGLayoutInputNode;
enum class NGBaselineAlgorithmType {
// Compute baselines for atomic inlines.
kAtomicInline,
// Compute baseline of first line box.
kFirstLine
};
// Baselines are products of layout.
// To compute baseline, add requests to NGConstraintSpace and run Layout().
struct NGBaselineRequest {
NGBaselineAlgorithmType algorithm_type;
FontBaseline baseline_type;
bool operator==(const NGBaselineRequest& other) const;
bool operator!=(const NGBaselineRequest& other) const {
return !(*this == other);
}
};
// Represents a computed baseline position.
struct NGBaseline {
NGBaselineRequest request;
LayoutUnit offset;
// @return if the node needs to propagate baseline requests/results.
static bool ShouldPropagateBaselines(const NGLayoutInputNode);
static bool ShouldPropagateBaselines(LayoutBox*);
};
} // namespace blink
#endif // NGBaseline_h
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