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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.
#ifndef StyleDifference_h
#define StyleDifference_h
#include "wtf/Allocator.h"
#include "wtf/Assertions.h"
namespace blink {
class StyleDifference {
STACK_ALLOCATED();
public:
enum PropertyDifference {
TransformChanged = 1 << 0,
OpacityChanged = 1 << 1,
ZIndexChanged = 1 << 2,
FilterChanged = 1 << 3,
BackdropFilterChanged = 1 << 4,
CSSClipChanged = 1 << 5,
// The object needs to issue paint invalidations if it is affected by text
// decorations or properties dependent on color (e.g., border or outline).
TextDecorationOrColorChanged = 1 << 6,
// If you add a value here, be sure to update the number of bits on
// m_propertySpecificDifferences.
};
StyleDifference()
: m_paintInvalidationType(NoPaintInvalidation),
m_layoutType(NoLayout),
m_recomputeOverflow(false),
m_propertySpecificDifferences(0),
m_scrollAnchorDisablingPropertyChanged(false) {}
bool hasDifference() const {
bool result = m_paintInvalidationType || m_layoutType ||
m_propertySpecificDifferences;
// m_recomputeOverflow, m_scrollAnchorDisablingPropertyChanged and
// are never set without other flags set.
DCHECK(result ||
(!m_recomputeOverflow && !m_scrollAnchorDisablingPropertyChanged));
return result;
}
bool hasAtMostPropertySpecificDifferences(
unsigned propertyDifferences) const {
return !m_paintInvalidationType && !m_layoutType &&
!(m_propertySpecificDifferences & ~propertyDifferences);
}
bool needsPaintInvalidation() const {
return m_paintInvalidationType != NoPaintInvalidation;
}
// The object just needs to issue paint invalidations.
bool needsPaintInvalidationObject() const {
return m_paintInvalidationType == PaintInvalidationObject;
}
void setNeedsPaintInvalidationObject() {
ASSERT(!needsPaintInvalidationSubtree());
m_paintInvalidationType = PaintInvalidationObject;
}
// The object and its descendants need to issue paint invalidations.
bool needsPaintInvalidationSubtree() const {
return m_paintInvalidationType == PaintInvalidationSubtree;
}
void setNeedsPaintInvalidationSubtree() {
m_paintInvalidationType = PaintInvalidationSubtree;
}
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 needsRecomputeOverflow() const { return m_recomputeOverflow; }
void setNeedsRecomputeOverflow() { m_recomputeOverflow = true; }
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 backdropFilterChanged() const {
return m_propertySpecificDifferences & BackdropFilterChanged;
}
void setBackdropFilterChanged() {
m_propertySpecificDifferences |= BackdropFilterChanged;
}
bool cssClipChanged() const {
return m_propertySpecificDifferences & CSSClipChanged;
}
void setCSSClipChanged() { m_propertySpecificDifferences |= CSSClipChanged; }
bool textDecorationOrColorChanged() const {
return m_propertySpecificDifferences & TextDecorationOrColorChanged;
}
void setTextDecorationOrColorChanged() {
m_propertySpecificDifferences |= TextDecorationOrColorChanged;
}
bool scrollAnchorDisablingPropertyChanged() const {
return m_scrollAnchorDisablingPropertyChanged;
}
void setScrollAnchorDisablingPropertyChanged() {
m_scrollAnchorDisablingPropertyChanged = true;
}
private:
enum PaintInvalidationType {
NoPaintInvalidation = 0,
PaintInvalidationObject,
PaintInvalidationSubtree
};
unsigned m_paintInvalidationType : 2;
enum LayoutType { NoLayout = 0, PositionedMovement, FullLayout };
unsigned m_layoutType : 2;
unsigned m_recomputeOverflow : 1;
unsigned m_propertySpecificDifferences : 7;
unsigned m_scrollAnchorDisablingPropertyChanged : 1;
};
} // namespace blink
#endif // StyleDifference_h
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