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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkRectPriv.h"
#include "SkSGNode.h"
#include "SkSGInvalidationController.h"
namespace sksg {
class Node::ScopedFlag {
public:
ScopedFlag(Node* node, uint32_t flag)
: fNode(node)
, fFlag(flag)
, fWasSet(node->fFlags & flag) {
node->fFlags |= flag;
}
~ScopedFlag() {
if (!fWasSet) {
fNode->fFlags &= ~fFlag;;
}
}
bool wasSet() const { return fWasSet; }
private:
Node* fNode;
uint32_t fFlag;
bool fWasSet;
};
#define TRAVERSAL_GUARD \
ScopedFlag traversal_guard(this, kInTraversal_Flag); \
if (traversal_guard.wasSet()) \
return
Node::Node(uint32_t invalTraits)
: fInvalObserver(nullptr)
, fBounds(SkRectPriv::MakeLargeS32())
, fInvalTraits(invalTraits)
, fFlags(kInvalidated_Flag) {}
Node::~Node() {
if (fFlags & kObserverArray_Flag) {
SkASSERT(fInvalObserverArray->isEmpty());
delete fInvalObserverArray;
} else {
SkASSERT(!fInvalObserver);
}
}
void Node::observeInval(const sk_sp<Node>& node) {
SkASSERT(node);
if (!(node->fFlags & kObserverArray_Flag)) {
if (!node->fInvalObserver) {
node->fInvalObserver = this;
return;
}
auto observers = new SkTDArray<Node*>();
observers->setReserve(2);
observers->push(node->fInvalObserver);
node->fInvalObserverArray = observers;
node->fFlags |= kObserverArray_Flag;
}
// No duplicate observers.
SkASSERT(node->fInvalObserverArray->find(this) < 0);
node->fInvalObserverArray->push(this);
}
void Node::unobserveInval(const sk_sp<Node>& node) {
SkASSERT(node);
if (!(node->fFlags & kObserverArray_Flag)) {
SkASSERT(node->fInvalObserver == this);
node->fInvalObserver = nullptr;
return;
}
const auto idx = node->fInvalObserverArray->find(this);
SkASSERT(idx >= 0);
node->fInvalObserverArray->remove(idx);
}
template <typename Func>
void Node::forEachInvalObserver(Func&& func) const {
if (fFlags & kObserverArray_Flag) {
for (const auto& parent : *fInvalObserverArray) {
func(parent);
}
return;
}
if (fInvalObserver) {
func(fInvalObserver);
}
}
void Node::invalidate(bool damageBubbling) {
TRAVERSAL_GUARD;
if (this->hasInval() && (!damageBubbling || (fFlags & kDamage_Flag))) {
// All done.
return;
}
if (damageBubbling && !(fInvalTraits & kBubbleDamage_Trait)) {
// Found a damage observer.
fFlags |= kDamage_Flag;
damageBubbling = false;
}
fFlags |= kInvalidated_Flag;
forEachInvalObserver([&](Node* observer) {
observer->invalidate(damageBubbling);
});
}
const SkRect& Node::revalidate(InvalidationController* ic, const SkMatrix& ctm) {
TRAVERSAL_GUARD fBounds;
if (!this->hasInval()) {
return fBounds;
}
SkRect prevBounds;
if (fFlags & kDamage_Flag) {
prevBounds = fBounds;
}
fBounds = this->onRevalidate(ic, ctm);
if (fFlags & kDamage_Flag) {
ic->inval(prevBounds, ctm);
if (fBounds != prevBounds) {
ic->inval(fBounds, ctm);
}
}
fFlags &= ~(kInvalidated_Flag | kDamage_Flag);
return fBounds;
}
} // namespace sksg
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