mirror of
https://github.com/classilla/tenfourfox.git
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188 lines
5.7 KiB
C++
188 lines
5.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsSMILCompositor.h"
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#include "nsSMILCSSProperty.h"
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#include "nsCSSProps.h"
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#include "nsHashKeys.h"
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// PLDHashEntryHdr methods
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bool
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nsSMILCompositor::KeyEquals(KeyTypePointer aKey) const
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{
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return aKey && aKey->Equals(mKey);
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}
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/*static*/ PLDHashNumber
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nsSMILCompositor::HashKey(KeyTypePointer aKey)
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{
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// Combine the 3 values into one numeric value, which will be hashed.
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// NOTE: We right-shift one of the pointers by 2 to get some randomness in
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// its 2 lowest-order bits. (Those shifted-off bits will always be 0 since
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// our pointers will be word-aligned.)
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return (NS_PTR_TO_UINT32(aKey->mElement.get()) >> 2) +
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NS_PTR_TO_UINT32(aKey->mAttributeName.get()) +
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(aKey->mIsCSS ? 1 : 0);
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}
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// Cycle-collection support
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void
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nsSMILCompositor::Traverse(nsCycleCollectionTraversalCallback* aCallback)
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{
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if (!mKey.mElement)
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return;
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*aCallback, "Compositor mKey.mElement");
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aCallback->NoteXPCOMChild(mKey.mElement);
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}
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// Other methods
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void
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nsSMILCompositor::AddAnimationFunction(nsSMILAnimationFunction* aFunc)
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{
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if (aFunc) {
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mAnimationFunctions.AppendElement(aFunc);
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}
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}
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void
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nsSMILCompositor::ComposeAttribute()
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{
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if (!mKey.mElement)
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return;
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// FIRST: Get the nsISMILAttr (to grab base value from, and to eventually
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// give animated value to)
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nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
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if (!smilAttr) {
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// Target attribute not found (or, out of memory)
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return;
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}
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if (mAnimationFunctions.IsEmpty()) {
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// No active animation functions. (We can still have a nsSMILCompositor in
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// that case if an animation function has *just* become inactive)
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smilAttr->ClearAnimValue();
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return;
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}
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// SECOND: Sort the animationFunctions, to prepare for compositing.
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nsSMILAnimationFunction::Comparator comparator;
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mAnimationFunctions.Sort(comparator);
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// THIRD: Step backwards through animation functions to find out
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// which ones we actually care about.
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uint32_t firstFuncToCompose = GetFirstFuncToAffectSandwich();
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// FOURTH: Get & cache base value
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nsSMILValue sandwichResultValue;
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if (!mAnimationFunctions[firstFuncToCompose]->WillReplace()) {
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sandwichResultValue = smilAttr->GetBaseValue();
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}
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UpdateCachedBaseValue(sandwichResultValue);
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if (!mForceCompositing) {
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return;
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}
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// FIFTH: Compose animation functions
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uint32_t length = mAnimationFunctions.Length();
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for (uint32_t i = firstFuncToCompose; i < length; ++i) {
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mAnimationFunctions[i]->ComposeResult(*smilAttr, sandwichResultValue);
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}
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if (sandwichResultValue.IsNull()) {
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smilAttr->ClearAnimValue();
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return;
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}
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// SIXTH: Set the animated value to the final composited result.
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nsresult rv = smilAttr->SetAnimValue(sandwichResultValue);
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if (NS_FAILED(rv)) {
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NS_WARNING("nsISMILAttr::SetAnimValue failed");
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}
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}
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void
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nsSMILCompositor::ClearAnimationEffects()
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{
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if (!mKey.mElement || !mKey.mAttributeName)
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return;
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nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
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if (!smilAttr) {
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// Target attribute not found (or, out of memory)
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return;
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}
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smilAttr->ClearAnimValue();
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}
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// Protected Helper Functions
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// --------------------------
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nsISMILAttr*
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nsSMILCompositor::CreateSMILAttr()
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{
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if (mKey.mIsCSS) {
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nsCSSProperty propId =
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nsCSSProps::LookupProperty(nsDependentAtomString(mKey.mAttributeName),
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nsCSSProps::eEnabledForAllContent);
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if (nsSMILCSSProperty::IsPropertyAnimatable(propId)) {
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return new nsSMILCSSProperty(propId, mKey.mElement.get());
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}
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} else {
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return mKey.mElement->GetAnimatedAttr(mKey.mAttributeNamespaceID,
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mKey.mAttributeName);
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}
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return nullptr;
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}
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uint32_t
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nsSMILCompositor::GetFirstFuncToAffectSandwich()
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{
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uint32_t i;
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for (i = mAnimationFunctions.Length(); i > 0; --i) {
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nsSMILAnimationFunction* curAnimFunc = mAnimationFunctions[i-1];
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// In the following, the lack of short-circuit behavior of |= means that we
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// will ALWAYS run UpdateCachedTarget (even if mForceCompositing is true)
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// but only call HasChanged and WasSkippedInPrevSample if necessary. This
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// is important since we need UpdateCachedTarget to run in order to detect
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// changes to the target in subsequent samples.
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mForceCompositing |=
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curAnimFunc->UpdateCachedTarget(mKey) ||
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curAnimFunc->HasChanged() ||
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curAnimFunc->WasSkippedInPrevSample();
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if (curAnimFunc->WillReplace()) {
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--i;
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break;
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}
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}
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// Mark remaining animation functions as having been skipped so if we later
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// use them we'll know to force compositing.
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// Note that we only really need to do this if something has changed
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// (otherwise we would have set the flag on a previous sample) and if
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// something has changed mForceCompositing will be true.
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if (mForceCompositing) {
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for (uint32_t j = i; j > 0; --j) {
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mAnimationFunctions[j-1]->SetWasSkipped();
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}
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}
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return i;
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}
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void
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nsSMILCompositor::UpdateCachedBaseValue(const nsSMILValue& aBaseValue)
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{
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if (!mCachedBaseValue) {
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// We don't have last sample's base value cached. Assume it's changed.
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mCachedBaseValue = new nsSMILValue(aBaseValue);
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NS_WARN_IF_FALSE(mCachedBaseValue, "failed to cache base value (OOM?)");
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mForceCompositing = true;
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} else if (*mCachedBaseValue != aBaseValue) {
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// Base value has changed since last sample.
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*mCachedBaseValue = aBaseValue;
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mForceCompositing = true;
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}
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}
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