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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 THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_DIFFERENCE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_DIFFERENCE_H_
#include <iosfwd>
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
namespace blink {
class StyleDifference {
STACK_ALLOCATED();
public:
enum PropertyDifference {
kTransformChanged = 1 << 0,
kOpacityChanged = 1 << 1,
kZIndexChanged = 1 << 2,
kFilterChanged = 1 << 3,
kBackdropFilterChanged = 1 << 4,
kCSSClipChanged = 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).
kTextDecorationOrColorChanged = 1 << 6,
kBlendModeChanged = 1 << 7,
// If you add a value here, be sure to update kPropertyDifferenceCount.
};
StyleDifference()
: paint_invalidation_type_(kNoPaintInvalidation),
layout_type_(kNoLayout),
recompute_overflow_(false),
visual_rect_update_(false),
property_specific_differences_(0),
scroll_anchor_disabling_property_changed_(false),
composited_reasons_changed_(false) {}
bool HasDifference() const {
return paint_invalidation_type_ || layout_type_ ||
property_specific_differences_ || recompute_overflow_ ||
visual_rect_update_ || scroll_anchor_disabling_property_changed_ ||
composited_reasons_changed_;
}
bool HasAtMostPropertySpecificDifferences(
unsigned property_differences) const {
return !paint_invalidation_type_ && !layout_type_ &&
!(property_specific_differences_ & ~property_differences);
}
bool NeedsFullPaintInvalidation() const {
return paint_invalidation_type_ != kNoPaintInvalidation;
}
// The object just needs to issue paint invalidations.
bool NeedsPaintInvalidationObject() const {
return paint_invalidation_type_ == kPaintInvalidationObject;
}
void SetNeedsPaintInvalidationObject() {
DCHECK(!NeedsPaintInvalidationSubtree());
paint_invalidation_type_ = kPaintInvalidationObject;
}
// The object and its descendants need to issue paint invalidations.
bool NeedsPaintInvalidationSubtree() const {
return paint_invalidation_type_ == kPaintInvalidationSubtree;
}
void SetNeedsPaintInvalidationSubtree() {
paint_invalidation_type_ = kPaintInvalidationSubtree;
}
bool NeedsLayout() const { return layout_type_ != kNoLayout; }
void ClearNeedsLayout() { layout_type_ = kNoLayout; }
// The offset of this positioned object has been updated.
bool NeedsPositionedMovementLayout() const {
return layout_type_ == kPositionedMovement;
}
void SetNeedsPositionedMovementLayout() {
DCHECK(!NeedsFullLayout());
layout_type_ = kPositionedMovement;
}
bool NeedsFullLayout() const { return layout_type_ == kFullLayout; }
void SetNeedsFullLayout() { layout_type_ = kFullLayout; }
bool NeedsRecomputeOverflow() const { return recompute_overflow_; }
void SetNeedsRecomputeOverflow() { recompute_overflow_ = true; }
bool NeedsVisualRectUpdate() const { return visual_rect_update_; }
void SetNeedsVisualRectUpdate() { visual_rect_update_ = true; }
bool TransformChanged() const {
return property_specific_differences_ & kTransformChanged;
}
void SetTransformChanged() {
property_specific_differences_ |= kTransformChanged;
}
bool OpacityChanged() const {
return property_specific_differences_ & kOpacityChanged;
}
void SetOpacityChanged() {
property_specific_differences_ |= kOpacityChanged;
}
bool ZIndexChanged() const {
return property_specific_differences_ & kZIndexChanged;
}
void SetZIndexChanged() { property_specific_differences_ |= kZIndexChanged; }
bool FilterChanged() const {
return property_specific_differences_ & kFilterChanged;
}
void SetFilterChanged() { property_specific_differences_ |= kFilterChanged; }
bool BackdropFilterChanged() const {
return property_specific_differences_ & kBackdropFilterChanged;
}
void SetBackdropFilterChanged() {
property_specific_differences_ |= kBackdropFilterChanged;
}
bool CssClipChanged() const {
return property_specific_differences_ & kCSSClipChanged;
}
void SetCSSClipChanged() {
property_specific_differences_ |= kCSSClipChanged;
}
bool BlendModeChanged() const {
return property_specific_differences_ & kBlendModeChanged;
}
void SetBlendModeChanged() {
property_specific_differences_ |= kBlendModeChanged;
}
bool TextDecorationOrColorChanged() const {
return property_specific_differences_ & kTextDecorationOrColorChanged;
}
void SetTextDecorationOrColorChanged() {
property_specific_differences_ |= kTextDecorationOrColorChanged;
}
bool ScrollAnchorDisablingPropertyChanged() const {
return scroll_anchor_disabling_property_changed_;
}
void SetScrollAnchorDisablingPropertyChanged() {
scroll_anchor_disabling_property_changed_ = true;
}
bool CompositingReasonsChanged() const { return composited_reasons_changed_; }
void SetCompositingReasonsChanged() { composited_reasons_changed_ = true; }
private:
static constexpr int kPropertyDifferenceCount = 8;
friend CORE_EXPORT std::ostream& operator<<(std::ostream&,
const StyleDifference&);
enum PaintInvalidationType {
kNoPaintInvalidation,
kPaintInvalidationObject,
kPaintInvalidationSubtree,
};
unsigned paint_invalidation_type_ : 2;
enum LayoutType { kNoLayout = 0, kPositionedMovement, kFullLayout };
unsigned layout_type_ : 2;
unsigned recompute_overflow_ : 1;
unsigned visual_rect_update_ : 1;
unsigned property_specific_differences_ : kPropertyDifferenceCount;
unsigned scroll_anchor_disabling_property_changed_ : 1;
unsigned composited_reasons_changed_ : 1;
};
CORE_EXPORT std::ostream& operator<<(std::ostream&, const StyleDifference&);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_DIFFERENCE_H_
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