3ba3fa72ae
... to avoid having too many Node friends. TBR= Change-Id: I8f8ff570d94ea48017935066a3d51cd8265ec120 Reviewed-on: https://skia-review.googlesource.com/97980 Reviewed-by: Florin Malita <fmalita@chromium.org> Commit-Queue: Florin Malita <fmalita@chromium.org>
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSGNode_DEFINED
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#define SkSGNode_DEFINED
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#include "SkRect.h"
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#include "SkRefCnt.h"
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#include "SkTDArray.h"
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class SkCanvas;
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class SkMatrix;
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namespace sksg {
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class InvalidationController;
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/**
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* Base class for all scene graph nodes.
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*
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* Handles ingress edge management for the DAG (i.e. node -> "parent" node mapping),
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* and invalidation.
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*
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* Note: egress edges are only implemented/supported in container subclasses
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* (e.g. Group, Effect, Draw).
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*/
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class Node : public SkRefCnt {
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public:
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// Traverse the DAG and revalidate any dependant/invalidated nodes.
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// Returns the bounding box for the DAG fragment.
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const SkRect& revalidate(InvalidationController*, const SkMatrix&);
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protected:
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enum InvalTraits {
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// Nodes with this trait never generate direct damage -- instead,
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// the damage bubbles up to ancestors.
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kBubbleDamage_Trait = 1 << 0,
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};
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explicit Node(uint32_t invalTraits);
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~Node() override;
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const SkRect& bounds() const {
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SkASSERT(!this->hasInval());
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return fBounds;
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}
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// Tag this node for invalidation and optional damage.
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void invalidate(bool damage = true);
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bool hasInval() const { return fFlags & kInvalidated_Flag; }
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// Dispatched on revalidation. Subclasses are expected to recompute/cache their properties
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// and return their bounding box in local coordinates.
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virtual SkRect onRevalidate(InvalidationController*, const SkMatrix& ctm) = 0;
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// Register/unregister |this| to receive invalidation events from a descendant.
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void observeInval(const sk_sp<Node>&);
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void unobserveInval(const sk_sp<Node>&);
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private:
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enum Flags {
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kInvalidated_Flag = 1 << 0, // the node or its descendants require revalidation
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kDamage_Flag = 1 << 1, // the node contributes damage during revalidation
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kObserverArray_Flag = 1 << 2, // the node has more than one inval observer
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kInTraversal_Flag = 1 << 3, // the node is part of a traversal (cycle detection)
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};
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template <typename Func>
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void forEachInvalObserver(Func&&) const;
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class ScopedFlag;
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union {
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Node* fInvalObserver;
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SkTDArray<Node*>* fInvalObserverArray;
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};
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SkRect fBounds;
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const uint32_t fInvalTraits : 16;
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uint32_t fFlags : 16;
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typedef SkRefCnt INHERITED;
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};
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// Helper for defining attribute getters/setters in subclasses.
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#define SG_ATTRIBUTE(attr_name, attr_type, attr_container) \
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const attr_type& get##attr_name() const { return attr_container; } \
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void set##attr_name(const attr_type& v) { \
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if (attr_container == v) return; \
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attr_container = v; \
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this->invalidate(); \
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}
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} // namespace sksg
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#endif // SkSGNode_DEFINED
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