зеркало из https://github.com/mozilla/pjs.git
203 строки
6.3 KiB
C++
203 строки
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Holbert <dholbert@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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PRBool
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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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PRUint32 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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PRUint32 length = mAnimationFunctions.Length();
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for (PRUint32 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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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 nsnull;
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}
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PRUint32
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nsSMILCompositor::GetFirstFuncToAffectSandwich()
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{
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PRUint32 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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if (curAnimFunc->UpdateCachedTarget(mKey) ||
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(!mForceCompositing && curAnimFunc->HasChanged())) {
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mForceCompositing = PR_TRUE;
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}
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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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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 = PR_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 = PR_TRUE;
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}
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}
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