Move core/layout/style to core/style

Source/core/layout/style/StyleDifference.h

-// 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.
-
-#ifndef StyleDifference_h
-#define StyleDifference_h
-
-#include "wtf/Assertions.h"
-
-namespace blink {
-
-class StyleDifference {
-public:
-    enum PropertyDifference {
-        TransformChanged = 1 << 0,
-        OpacityChanged = 1 << 1,
-        ZIndexChanged = 1 << 2,
-        FilterChanged = 1 << 3,
-        // The object needs to issue paint invalidations if it contains text or properties dependent on color (e.g., border or outline).
-        TextOrColorChanged = 1 << 4,
-    };
-
-    StyleDifference()
-        : m_paintInvalidationType(NoPaintInvalidation)
-        , m_layoutType(NoLayout)
-        , m_propertySpecificDifferences(0)
-    { }
-
-    bool hasDifference() const { return m_paintInvalidationType || m_layoutType || m_propertySpecificDifferences; }
-
-    bool hasAtMostPropertySpecificDifferences(unsigned propertyDifferences) const
-    {
-        return !m_paintInvalidationType && !m_layoutType && !(m_propertySpecificDifferences & ~propertyDifferences);
-    }
-
-    bool needsPaintInvalidation() const { return m_paintInvalidationType != NoPaintInvalidation; }
-    void clearNeedsPaintInvalidation() { m_paintInvalidationType = NoPaintInvalidation; }
-
-    // The object just needs to issue paint invalidations.
-    bool needsPaintInvalidationObject() const { return m_paintInvalidationType == PaintInvalidationObject; }
-    void setNeedsPaintInvalidationObject()
-    {
-        ASSERT(!needsPaintInvalidationLayer());
-        m_paintInvalidationType = PaintInvalidationObject;
-    }
-
-    // The layer and its descendant layers need to issue paint invalidations.
-    bool needsPaintInvalidationLayer() const { return m_paintInvalidationType == PaintInvalidationLayer; }
-    void setNeedsPaintInvalidationLayer() { m_paintInvalidationType = PaintInvalidationLayer; }
-
-    bool needsLayout() const { return m_layoutType != NoLayout; }
-    void clearNeedsLayout() { m_layoutType = NoLayout; }
-
-    // The offset of this positioned object has been updated.
-    bool needsPositionedMovementLayout() const { return m_layoutType == PositionedMovement; }
-    void setNeedsPositionedMovementLayout()
-    {
-        ASSERT(!needsFullLayout());
-        m_layoutType = PositionedMovement;
-    }
-
-    bool needsFullLayout() const { return m_layoutType == FullLayout; }
-    void setNeedsFullLayout() { m_layoutType = FullLayout; }
-
-    bool transformChanged() const { return m_propertySpecificDifferences & TransformChanged; }
-    void setTransformChanged() { m_propertySpecificDifferences |= TransformChanged; }
-
-    bool opacityChanged() const { return m_propertySpecificDifferences & OpacityChanged; }
-    void setOpacityChanged() { m_propertySpecificDifferences |= OpacityChanged; }
-
-    bool zIndexChanged() const { return m_propertySpecificDifferences & ZIndexChanged; }
-    void setZIndexChanged() { m_propertySpecificDifferences |= ZIndexChanged; }
-
-    bool filterChanged() const { return m_propertySpecificDifferences & FilterChanged; }
-    void setFilterChanged() { m_propertySpecificDifferences |= FilterChanged; }
-
-    bool textOrColorChanged() const { return m_propertySpecificDifferences & TextOrColorChanged; }
-    void setTextOrColorChanged() { m_propertySpecificDifferences |= TextOrColorChanged; }
-
-private:
-    enum PaintInvalidationType {
-        NoPaintInvalidation = 0,
-        PaintInvalidationObject,
-        PaintInvalidationLayer
-    };
-    unsigned m_paintInvalidationType : 2;
-
-    enum LayoutType {
-        NoLayout = 0,
-        PositionedMovement,
-        FullLayout
-    };
-    unsigned m_layoutType : 2;
-
-    unsigned m_propertySpecificDifferences : 5;
-};
-
-} // namespace blink
-
-#endif // StyleDifference_h