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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/platform/graphics/paint/paint_property_node.h"
#include "third_party/blink/renderer/platform/graphics/paint/clip_paint_property_node.h"
#include "third_party/blink/renderer/platform/graphics/paint/effect_paint_property_node.h"
#include "third_party/blink/renderer/platform/graphics/paint/scroll_paint_property_node.h"
#include "third_party/blink/renderer/platform/graphics/paint/transform_paint_property_node.h"
namespace blink {
int PaintPropertyNode::NodeDepthOrFoundAncestor(
const PaintPropertyNode& maybe_ancestor) const {
int depth = 0;
for (const auto* n = this; n; n = n->Parent()) {
if (n == &maybe_ancestor) {
return -1;
}
depth++;
}
return depth;
}
const PaintPropertyNode& PaintPropertyNode::LowestCommonAncestorInternal(
const PaintPropertyNode& other) const {
// Measure both depths.
auto depth_a = NodeDepthOrFoundAncestor(other);
if (depth_a == -1) {
return other;
}
auto depth_b = other.NodeDepthOrFoundAncestor(*this);
if (depth_b == -1) {
return *this;
}
const auto* a_ptr = this;
const auto* b_ptr = &other;
// Make it so depth_a >= depth_b.
if (depth_a < depth_b) {
std::swap(a_ptr, b_ptr);
std::swap(depth_a, depth_b);
}
// Make it so depth_a == depth_b.
while (depth_a > depth_b) {
a_ptr = a_ptr->Parent();
depth_a--;
}
// Walk up until we find the ancestor.
while (a_ptr != b_ptr) {
a_ptr = a_ptr->Parent();
b_ptr = b_ptr->Parent();
}
DCHECK(a_ptr) << "Malformed property tree. All nodes must be descendant of "
"the same root.";
return *a_ptr;
}
String PaintPropertyNode::ToString() const {
String s = ToJSON()->ToJSONString();
#if DCHECK_IS_ON()
return debug_name_ + String::Format(" %p ", this) + s;
#else
return s;
#endif
}
std::unique_ptr<JSONObject> PaintPropertyNode::ToJSON() const {
auto json = std::make_unique<JSONObject>();
if (Parent()) {
json->SetString("parent", String::Format("%p", Parent()));
}
if (IsParentAlias()) {
json->SetBoolean("is_alias", true);
}
if (NodeChanged() != PaintPropertyChangeType::kUnchanged) {
json->SetString("changed", PaintPropertyChangeTypeToString(NodeChanged()));
}
return json;
}
const char* PaintPropertyChangeTypeToString(PaintPropertyChangeType change) {
switch (change) {
case PaintPropertyChangeType::kUnchanged:
return "unchanged";
case PaintPropertyChangeType::kChangedOnlyCompositedValues:
return "composited-values";
case PaintPropertyChangeType::kChangedOnlyNonRerasterValues:
return "non-reraster";
case PaintPropertyChangeType::kChangedOnlySimpleValues:
return "simple-values";
case PaintPropertyChangeType::kChangedOnlyValues:
return "values";
case PaintPropertyChangeType::kNodeAddedOrRemoved:
return "node-add-remove";
}
}
#if DCHECK_IS_ON()
String PaintPropertyNode::ToTreeString() const {
return PropertyTreePrinter().PathAsString(*this);
}
void PropertyTreePrinter::AddNode(const PaintPropertyNode* node) {
if (node) {
nodes_.insert(node);
}
}
String PropertyTreePrinter::NodesAsTreeString() {
if (nodes_.empty()) {
return "";
}
StringBuilder string_builder;
BuildTreeString(string_builder, RootNode(), 0);
return string_builder.ToString();
}
String PropertyTreePrinter::PathAsString(const PaintPropertyNode& last_node) {
for (const auto* n = &last_node; n; n = n->Parent()) {
AddNode(n);
}
return NodesAsTreeString();
}
void PropertyTreePrinter::BuildTreeString(StringBuilder& string_builder,
const PaintPropertyNode& node,
unsigned indent) {
for (unsigned i = 0; i < indent; i++) {
string_builder.Append(' ');
}
string_builder.Append(node.DebugName());
string_builder.Append(String::Format(" %p ", &node));
auto json = node.ToJSON();
json->Remove("parent");
string_builder.Append(json->ToJSONString());
string_builder.Append("\n");
for (const auto& child_node : nodes_) {
if (child_node->Parent() == &node) {
BuildTreeString(string_builder, *child_node, indent + 2);
}
}
}
const PaintPropertyNode& PropertyTreePrinter::RootNode() {
const auto* node = nodes_.back().Get();
while (!node->IsRoot()) {
node = node->Parent();
}
if (node->DebugName().empty()) {
const_cast<PaintPropertyNode*>(node)->SetDebugName("root");
}
nodes_.insert(node);
return *node;
}
#endif // DCHECK_IS_ON()
} // namespace blink
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