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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/paint/fragment_data.h"
#include "base/debug/dump_without_crashing.h"
#include "third_party/blink/renderer/core/page/scrolling/sticky_position_scrolling_constraints.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/platform/graphics/paint/geometry_mapper.h"
namespace blink {
// These are defined here because of PaintLayer dependency.
FragmentData::RareData::RareData() = default;
FragmentData::RareData::~RareData() = default;
void FragmentData::RareData::EnsureId() {
if (!unique_id) {
unique_id = NewUniqueObjectId();
}
}
void FragmentData::RareData::SetLayer(PaintLayer* new_layer) {
if (layer && layer != new_layer) {
layer->Destroy();
sticky_constraints = nullptr;
}
layer = new_layer;
}
void FragmentData::RareData::Trace(Visitor* visitor) const {
visitor->Trace(layer);
visitor->Trace(sticky_constraints);
visitor->Trace(additional_fragments);
visitor->Trace(paint_properties);
visitor->Trace(local_border_box_properties);
}
FragmentData::RareData& FragmentData::EnsureRareData() {
if (!rare_data_)
rare_data_ = MakeGarbageCollected<RareData>();
return *rare_data_;
}
void FragmentData::SetLayer(PaintLayer* layer) {
AssertIsFirst();
if (rare_data_ || layer)
EnsureRareData().SetLayer(layer);
}
const TransformPaintPropertyNodeOrAlias& FragmentData::PreTransform() const {
if (const auto* properties = PaintProperties()) {
for (const TransformPaintPropertyNode* transform :
properties->AllCSSTransformPropertiesOutsideToInside()) {
if (transform) {
DCHECK(transform->Parent());
return *transform->Parent();
}
}
}
return LocalBorderBoxProperties().Transform();
}
const TransformPaintPropertyNodeOrAlias& FragmentData::ContentsTransform()
const {
if (const auto* properties = PaintProperties()) {
if (properties->TransformIsolationNode())
return *properties->TransformIsolationNode();
if (properties->ScrollTranslation())
return *properties->ScrollTranslation();
if (properties->ReplacedContentTransform())
return *properties->ReplacedContentTransform();
if (properties->Perspective())
return *properties->Perspective();
}
return LocalBorderBoxProperties().Transform();
}
const ClipPaintPropertyNodeOrAlias& FragmentData::PreClip() const {
if (const auto* properties = PaintProperties()) {
if (const auto* clip = properties->ClipPathClip()) {
DCHECK(clip->Parent());
return *clip->Parent();
}
if (const auto* mask_clip = properties->MaskClip()) {
DCHECK(mask_clip->Parent());
return *mask_clip->Parent();
}
if (const auto* css_clip = properties->CssClip()) {
DCHECK(css_clip->Parent());
return *css_clip->Parent();
}
if (const auto* clip = properties->PixelMovingFilterClipExpander()) {
DCHECK(clip->Parent());
return *clip->Parent();
}
}
return LocalBorderBoxProperties().Clip();
}
const ClipPaintPropertyNodeOrAlias& FragmentData::ContentsClip() const {
if (const auto* properties = PaintProperties()) {
if (properties->ClipIsolationNode())
return *properties->ClipIsolationNode();
if (properties->OverflowClip())
return *properties->OverflowClip();
if (properties->InnerBorderRadiusClip())
return *properties->InnerBorderRadiusClip();
}
return LocalBorderBoxProperties().Clip();
}
const EffectPaintPropertyNodeOrAlias& FragmentData::PreEffect() const {
if (const auto* properties = PaintProperties()) {
if (const auto* effect = properties->Effect()) {
DCHECK(effect->Parent());
return *effect->Parent();
}
if (const auto* filter = properties->Filter()) {
DCHECK(filter->Parent());
return *filter->Parent();
}
}
return LocalBorderBoxProperties().Effect();
}
const EffectPaintPropertyNodeOrAlias& FragmentData::ContentsEffect() const {
if (const auto* properties = PaintProperties()) {
if (properties->EffectIsolationNode())
return *properties->EffectIsolationNode();
}
return LocalBorderBoxProperties().Effect();
}
PropertyTreeStateOrAlias FragmentData::LocalBorderBoxPropertiesFallback()
const {
// TODO(crbug.com/40218657): This should never be reached, but does in
// practice and we haven't been able to find all of the cases where it
// happens yet. crbug.com/40152845 is an example case. crbug.com/396612314
// is an example of fixed cases.
#if DCHECK_IS_ON()
// Crash on DCHECK build.
NOTREACHED();
#else
// Otherwise, dump stack without crashing, and fallback to root. This may
// cause unexpected situation in later stages, which are probably also worked
// around. We can remove this function and all later workarounds if this no
// longer happens.
base::debug::DumpWithoutCrashing();
return PropertyTreeStateOrAlias::Root();
#endif
}
FragmentData& FragmentDataList::AppendNewFragment() {
AssertIsFirst();
FragmentData* new_fragment = MakeGarbageCollected<FragmentData>();
EnsureRareData().additional_fragments.push_back(new_fragment);
return *new_fragment;
}
void FragmentDataList::Shrink(wtf_size_t new_size) {
CHECK_GE(new_size, 1u);
CHECK_LE(new_size, size());
if (rare_data_) {
rare_data_->additional_fragments.resize(new_size - 1);
}
}
FragmentData& FragmentDataList::back() {
AssertIsFirst();
if (rare_data_ && !rare_data_->additional_fragments.empty()) {
return *rare_data_->additional_fragments.back();
}
return *this;
}
const FragmentData& FragmentDataList::back() const {
return const_cast<FragmentDataList*>(this)->back();
}
FragmentData& FragmentDataList::at(wtf_size_t idx) {
AssertIsFirst();
if (idx == 0) {
return *this;
}
CHECK(rare_data_);
return *rare_data_->additional_fragments.at(idx - 1);
}
const FragmentData& FragmentDataList::at(wtf_size_t idx) const {
return const_cast<FragmentDataList*>(this)->at(idx);
}
wtf_size_t FragmentDataList::size() const {
return rare_data_ ? rare_data_->additional_fragments.size() + 1 : 1;
}
} // namespace blink
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