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// Copyright 2020 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 THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_ASPECT_RATIO_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_ASPECT_RATIO_H_
#include "third_party/blink/renderer/platform/geometry/float_size.h"
#include "third_party/blink/renderer/platform/geometry/int_size.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
enum class EAspectRatioType { kAuto, kAutoAndRatio, kRatio };
class StyleAspectRatio {
DISALLOW_NEW();
public:
// Style data for aspect-ratio: auto || <ratio>
StyleAspectRatio(EAspectRatioType type, FloatSize ratio)
: type_(static_cast<unsigned>(type)), ratio_(ratio) {}
// 0/x and x/0 are valid (and computed style needs to serialize them
// as such), but they are not useful for layout, so we map it to auto here.
EAspectRatioType GetType() const {
if (ratio_.Width() == 0 || ratio_.Height() == 0)
return EAspectRatioType::kAuto;
// Since we do calculations on LayoutUnits, also check that our width/height
// doesn't convert to zero.
if (ratio_.Width() < LayoutUnit::Epsilon() ||
ratio_.Height() < LayoutUnit::Epsilon()) {
return EAspectRatioType::kAuto;
}
return GetTypeForComputedStyle();
}
EAspectRatioType GetTypeForComputedStyle() const {
return static_cast<EAspectRatioType>(type_);
}
bool IsAuto() const { return GetType() == EAspectRatioType::kAuto; }
FloatSize GetRatio() const { return ratio_; }
bool operator==(const StyleAspectRatio& o) const {
return type_ == o.type_ && ratio_ == o.ratio_;
}
bool operator!=(const StyleAspectRatio& o) const { return !(*this == o); }
private:
unsigned type_ : 2; // EAspectRatioType
FloatSize ratio_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_ASPECT_RATIO_H_
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