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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/smil/nsSMILCompositor.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/smil/nsSMILCompositor.cpp')
-rw-r--r--dom/smil/nsSMILCompositor.cpp204
1 files changed, 204 insertions, 0 deletions
diff --git a/dom/smil/nsSMILCompositor.cpp b/dom/smil/nsSMILCompositor.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsCSSProps.h"
+#include "nsHashKeys.h"
+#include "nsSMILCSSProperty.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(bool& aMightHavePendingStyleUpdates)
+{
+ 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();
+ // Removing the animation effect may require a style update.
+ aMightHavePendingStyleUpdates = true;
+ 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
+ aMightHavePendingStyleUpdates = true;
+ 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) {
+ nsCSSPropertyID propId =
+ nsCSSProps::LookupProperty(nsDependentAtomString(mKey.mAttributeName),
+ CSSEnabledState::eForAllContent);
+ 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()
+{
+ // For performance reasons, we throttle most animations on elements in
+ // display:none subtrees. (We can't throttle animations that target the
+ // "display" property itself, though -- if we did, display:none elements
+ // could never be dynamically displayed via animations.)
+ // To determine whether we're in a display:none subtree, we will check the
+ // element's primary frame since element in display:none subtree doesn't have
+ // a primary frame. Before this process, we will construct frame when we
+ // append an element to subtree. So we will not need to worry about pending
+ // frame construction in this step.
+ bool canThrottle = mKey.mAttributeName != nsGkAtoms::display &&
+ !mKey.mElement->GetPrimaryFrame();
+
+ 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() && !canThrottle) ||
+ 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_WARNING_ASSERTION(mCachedBaseValue, "failed to cache base value (OOM?)");
+ mForceCompositing = true;
+ } else if (*mCachedBaseValue != aBaseValue) {
+ // Base value has changed since last sample.
+ *mCachedBaseValue = aBaseValue;
+ mForceCompositing = true;
+ }
+}