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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 <algorithm>
#include <iosfwd>
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/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,
kCSSClipChanged = 1 << 4,
// The object needs to issue paint invalidations if it is affected by text
// decorations or properties dependent on color (e.g., border or outline).
// TextDecoration changes must also invalidate ink overflow.
kTextDecorationOrColorChanged = 1 << 5,
kBlendModeChanged = 1 << 6,
kMaskChanged = 1 << 7,
// Whether background-color changed alpha to or from 1.
kHasAlphaChanged = 1 << 8,
// If you add a value here, be sure to update kPropertyDifferenceCount.
};
StyleDifference()
: needs_paint_invalidation_(false),
layout_type_(kNoLayout),
needs_reshape_(false),
recompute_visual_overflow_(false),
visual_rect_update_(false),
property_specific_differences_(0),
scroll_anchor_disabling_property_changed_(false),
compositing_reasons_changed_(false) {}
void Merge(StyleDifference other) {
needs_paint_invalidation_ |= other.needs_paint_invalidation_;
layout_type_ = std::max(layout_type_, other.layout_type_);
needs_reshape_ |= other.needs_reshape_;
recompute_visual_overflow_ |= other.recompute_visual_overflow_;
visual_rect_update_ |= other.visual_rect_update_;
property_specific_differences_ |= other.property_specific_differences_;
scroll_anchor_disabling_property_changed_ |=
other.scroll_anchor_disabling_property_changed_;
compositing_reasons_changed_ |= other.compositing_reasons_changed_;
}
bool HasDifference() const {
return needs_paint_invalidation_ || layout_type_ || needs_reshape_ ||
property_specific_differences_ || recompute_visual_overflow_ ||
visual_rect_update_ || scroll_anchor_disabling_property_changed_ ||
compositing_reasons_changed_;
}
bool HasAtMostPropertySpecificDifferences(
unsigned property_differences) const {
return !needs_paint_invalidation_ && !layout_type_ &&
!compositing_reasons_changed_ &&
!(property_specific_differences_ & ~property_differences);
}
bool NeedsPaintInvalidation() const { return needs_paint_invalidation_; }
void SetNeedsPaintInvalidation() { needs_paint_invalidation_ = true; }
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 NeedsReshape() const { return needs_reshape_; }
void SetNeedsReshape() { needs_reshape_ = true; }
bool NeedsRecomputeVisualOverflow() const {
return recompute_visual_overflow_;
}
void SetNeedsRecomputeVisualOverflow() { recompute_visual_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 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 MaskChanged() const {
return property_specific_differences_ & kMaskChanged;
}
void SetMaskChanged() { property_specific_differences_ |= kMaskChanged; }
bool HasAlphaChanged() const {
return property_specific_differences_ & kHasAlphaChanged;
}
void SetHasAlphaChanged() {
property_specific_differences_ |= kHasAlphaChanged;
}
bool ScrollAnchorDisablingPropertyChanged() const {
return scroll_anchor_disabling_property_changed_;
}
void SetScrollAnchorDisablingPropertyChanged() {
scroll_anchor_disabling_property_changed_ = true;
}
bool CompositingReasonsChanged() const {
return compositing_reasons_changed_;
}
void SetCompositingReasonsChanged() { compositing_reasons_changed_ = true; }
private:
static constexpr int kPropertyDifferenceCount = 9;
friend CORE_EXPORT std::ostream& operator<<(std::ostream&,
const StyleDifference&);
unsigned needs_paint_invalidation_ : 1;
enum LayoutType { kNoLayout = 0, kPositionedMovement, kFullLayout };
unsigned layout_type_ : 2;
unsigned needs_reshape_ : 1;
unsigned recompute_visual_overflow_ : 1;
unsigned visual_rect_update_ : 1;
unsigned property_specific_differences_ : kPropertyDifferenceCount;
unsigned scroll_anchor_disabling_property_changed_ : 1;
unsigned compositing_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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