4aa4441186
Sketching a thin (as in close-to-skia-semantics) scene graph API, focused on
external animation, inval tracking and minimal repaint.
Only a few concrete classes/features so far:
* Rect/Color/Transform/Group
* basic inval tracking
* a trivial animated sample with inval visualization
Pretty much everything (especially naming) is volatile, so treat accordingly.
The interesting bits to review are likely in Node.{h,cpp} for inval and
SampleSGInval.cpp for usage.
Initial class hierarchy:
* Node: invalidation/ancestors tracking
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-- * RenderNode: onRender(SkCanvas)
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| -- * Draw (concrete): rendering a [geometry, paint] tuple
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| -- * Group (concrete): grouping multiple RenderNodes
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| -- * EffectNode: single-descendant effect wrapper
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| -- * Transform (concrete): transform effect
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-- * PaintNode: onMakePaint()
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| -- * Color (concrete): SkColor paint wrapper
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-- * GeometryNode: onComputeBounds(), onDraw(SkCanvas, SkPaint)
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-- * Rect (concrete): SkRect wrapper
TBR=
Change-Id: Iacf9b773c181a7582ecd31ee968562f179d1aa1b
Reviewed-on: https://skia-review.googlesource.com/85502
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
118 lines
2.6 KiB
C++
118 lines
2.6 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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#include "SkSGNode.h"
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namespace sksg {
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class Node::ScopedFlag {
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public:
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ScopedFlag(Node* node, uint32_t flag)
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: fNode(node)
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, fFlag(flag) {
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SkASSERT(!(fNode->fFlags & fFlag));
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fNode->fFlags |= fFlag;
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}
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~ScopedFlag() {
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fNode->fFlags &= ~fFlag;;
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}
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private:
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Node* fNode;
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uint32_t fFlag;
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};
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#define TRAVERSAL_GUARD \
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if (this->fFlags & kInTraversal_Flag) { \
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return; \
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} \
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ScopedFlag traversal_guard(this, kInTraversal_Flag);
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Node::Node()
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: fInvalReceiver(nullptr)
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, fFlags(kInvalidated_Flag) {}
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Node::~Node() {
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if (fFlags & kReceiverArray_Flag) {
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SkASSERT(fInvalReceiverArray->isEmpty());
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delete fInvalReceiverArray;
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} else {
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SkASSERT(!fInvalReceiver);
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}
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}
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void Node::addInvalReceiver(Node* receiver) {
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if (!(fFlags & kReceiverArray_Flag)) {
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if (!fInvalReceiver) {
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fInvalReceiver = receiver;
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return;
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}
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auto receivers = new SkTDArray<Node*>();
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receivers->setReserve(2);
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receivers->push(fInvalReceiver);
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fInvalReceiverArray = receivers;
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fFlags |= kReceiverArray_Flag;
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}
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// No duplicate receivers.
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SkASSERT(fInvalReceiverArray->find(receiver) < 0);
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fInvalReceiverArray->push(receiver);
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}
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void Node::removeInvalReceiver(Node* receiver) {
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if (!(fFlags & kReceiverArray_Flag)) {
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SkASSERT(fInvalReceiver == receiver);
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fInvalReceiver = nullptr;
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return;
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}
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const auto idx = fInvalReceiverArray->find(receiver);
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SkASSERT(idx >= 0);
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fInvalReceiverArray->remove(idx);
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}
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template <typename Func>
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void Node::forEachInvalReceiver(Func&& func) const {
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if (fFlags & kReceiverArray_Flag) {
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for (const auto& parent : *fInvalReceiverArray) {
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func(parent);
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}
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return;
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}
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if (fInvalReceiver) {
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func(fInvalReceiver);
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}
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}
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void Node::invalidate() {
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TRAVERSAL_GUARD
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if (this->isInvalidated()) {
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return;
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}
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fFlags |= kInvalidated_Flag;
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forEachInvalReceiver([&](Node* receiver) {
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receiver->invalidate();
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});
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}
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void Node::revalidate(InvalidationController* ic, const SkMatrix& ctm) {
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TRAVERSAL_GUARD
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if (this->isInvalidated()) {
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this->onRevalidate(ic, ctm);
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fFlags &= ~kInvalidated_Flag;
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}
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}
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} // namespace sksg
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