The Tor Browser: comparison dom/smil/nsSMILCompositor.cpp

--1:000000000000
+:5f806e061045
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsSMILCompositor.h"
+#include "nsSMILCSSProperty.h"
+#include "nsCSSProps.h"
+#include "nsHashKeys.h"
+// PLDHashEntryHdr methods
+bool
+nsSMILCompositor::KeyEquals(KeyTypePointer aKey) const
+{
+return aKey && aKey->Equals(mKey);
+}
+/*static*/ PLDHashNumber
+nsSMILCompositor::HashKey(KeyTypePointer aKey)
+{
+// Combine the 3 values into one numeric value, which will be hashed.
+// NOTE: We right-shift one of the pointers by 2 to get some randomness in
+// its 2 lowest-order bits. (Those shifted-off bits will always be 0 since
+// our pointers will be word-aligned.)
+return (NS_PTR_TO_UINT32(aKey->mElement.get()) >> 2) +
+NS_PTR_TO_UINT32(aKey->mAttributeName.get()) +
+(aKey->mIsCSS ? 1 : 0);
+}
+// Cycle-collection support
+void
+nsSMILCompositor::Traverse(nsCycleCollectionTraversalCallback* aCallback)
+{
+if (!mKey.mElement)
+return;
+NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*aCallback, "Compositor mKey.mElement");
+aCallback->NoteXPCOMChild(mKey.mElement);
+}
+// Other methods
+void
+nsSMILCompositor::AddAnimationFunction(nsSMILAnimationFunction* aFunc)
+{
+if (aFunc) {
+mAnimationFunctions.AppendElement(aFunc);
+}
+}
+void
+nsSMILCompositor::ComposeAttribute()
+{
+if (!mKey.mElement)
+return;
+// FIRST: Get the nsISMILAttr (to grab base value from, and to eventually
+// give animated value to)
+nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
+if (!smilAttr) {
+// Target attribute not found (or, out of memory)
+return;
+}
+if (mAnimationFunctions.IsEmpty()) {
+// No active animation functions. (We can still have a nsSMILCompositor in
+// that case if an animation function has *just* become inactive)
+smilAttr->ClearAnimValue();
+return;
+}
+// SECOND: Sort the animationFunctions, to prepare for compositing.
+nsSMILAnimationFunction::Comparator comparator;
+mAnimationFunctions.Sort(comparator);
+// THIRD: Step backwards through animation functions to find out
+// which ones we actually care about.
+uint32_t firstFuncToCompose = GetFirstFuncToAffectSandwich();
+// FOURTH: Get & cache base value
+nsSMILValue sandwichResultValue;
+if (!mAnimationFunctions[firstFuncToCompose]->WillReplace()) {
+sandwichResultValue = smilAttr->GetBaseValue();
+}
+UpdateCachedBaseValue(sandwichResultValue);
+if (!mForceCompositing) {
+return;
+}
+// FIFTH: Compose animation functions
+uint32_t length = mAnimationFunctions.Length();
+for (uint32_t i = firstFuncToCompose; i < length; ++i) {
+mAnimationFunctions[i]->ComposeResult(*smilAttr, sandwichResultValue);
+}
+if (sandwichResultValue.IsNull()) {
+smilAttr->ClearAnimValue();
+return;
+}
+// SIXTH: Set the animated value to the final composited result.
+nsresult rv = smilAttr->SetAnimValue(sandwichResultValue);
+if (NS_FAILED(rv)) {
+NS_WARNING("nsISMILAttr::SetAnimValue failed");
+}
+}
+void
+nsSMILCompositor::ClearAnimationEffects()
+{
+if (!mKey.mElement || !mKey.mAttributeName)
+return;
+nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
+if (!smilAttr) {
+// Target attribute not found (or, out of memory)
+return;
+}
+smilAttr->ClearAnimValue();
+}
+// Protected Helper Functions
+// --------------------------
+nsISMILAttr*
+nsSMILCompositor::CreateSMILAttr()
+{
+if (mKey.mIsCSS) {
+nsCSSProperty propId =
+nsCSSProps::LookupProperty(nsDependentAtomString(mKey.mAttributeName),
+nsCSSProps::eEnabledForAllContent);
+if (nsSMILCSSProperty::IsPropertyAnimatable(propId)) {
+return new nsSMILCSSProperty(propId, mKey.mElement.get());
+}
+} else {
+return mKey.mElement->GetAnimatedAttr(mKey.mAttributeNamespaceID,
+mKey.mAttributeName);
+}
+return nullptr;
+}
+uint32_t
+nsSMILCompositor::GetFirstFuncToAffectSandwich()
+{
+uint32_t i;
+for (i = mAnimationFunctions.Length(); i > 0; --i) {
+nsSMILAnimationFunction* curAnimFunc = mAnimationFunctions[i-1];
+// In the following, the lack of short-circuit behavior of |= means that we
+// will ALWAYS run UpdateCachedTarget (even if mForceCompositing is true)
+// but only call HasChanged and WasSkippedInPrevSample if necessary.  This
+// is important since we need UpdateCachedTarget to run in order to detect
+// changes to the target in subsequent samples.
+mForceCompositing |=
+curAnimFunc->UpdateCachedTarget(mKey) ||
+curAnimFunc->HasChanged() ||
+curAnimFunc->WasSkippedInPrevSample();
+if (curAnimFunc->WillReplace()) {
+--i;
+break;
+}
+}
+// Mark remaining animation functions as having been skipped so if we later
+// use them we'll know to force compositing.
+// Note that we only really need to do this if something has changed
+// (otherwise we would have set the flag on a previous sample) and if
+// something has changed mForceCompositing will be true.
+if (mForceCompositing) {
+for (uint32_t j = i; j > 0; --j) {
+mAnimationFunctions[j-1]->SetWasSkipped();
+}
+}
+return i;
+}
+void
+nsSMILCompositor::UpdateCachedBaseValue(const nsSMILValue& aBaseValue)
+{
+if (!mCachedBaseValue) {
+// We don't have last sample's base value cached. Assume it's changed.
+mCachedBaseValue = new nsSMILValue(aBaseValue);
+NS_WARN_IF_FALSE(mCachedBaseValue, "failed to cache base value (OOM?)");
+mForceCompositing = true;
+} else if (*mCachedBaseValue != aBaseValue) {
+// Base value has changed since last sample.
+*mCachedBaseValue = aBaseValue;
+mForceCompositing = true;
+}
+}

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comparison: dom/smil/nsSMILCompositor.cpp

dom/smil/nsSMILCompositor.cpp