gecko/content/smil/nsSMILCompositor.cpp

185 lines
5.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is the Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Holbert <dholbert@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSMILCompositor.h"
#include "nsHashKeys.h"
// nsSMILCompositorKey methods
inline PRBool
nsSMILCompositorKey::Equals(const nsSMILCompositorKey &aOther) const
{
return (aOther.mElement == mElement &&
aOther.mAttributeName == mAttributeName &&
aOther.mIsCSS == mIsCSS);
}
// PLDHashEntryHdr methods
PRBool
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
const char *attrName = nsnull;
aKey->mAttributeName->GetUTF8String(&attrName);
return NS_PTR_TO_UINT32(aKey->mElement.get()) +
HashString(attrName) +
(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);
}
}
nsISMILAttr*
nsSMILCompositor::CreateSMILAttr()
{
if (mKey.mIsCSS) {
// XXX Look up style system for the CSS property. The set of CSS properties
// should be the same for all elements so we don't need to query the element
// itself.
} else {
return mKey.mElement->GetAnimatedAttr(mKey.mAttributeName);
}
return nsnull;
}
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
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.
// PRBool changed = PR_FALSE; // XXXdholbert removing until we have
// HasChangedTarget
PRUint32 length = mAnimationFunctions.Length();
PRUint32 i;
for (i = length; i > 0; --i) {
nsSMILAnimationFunction* curAnimFunc = mAnimationFunctions[i-1];
// XXXdholbert we need to add another function
// nsSMILAnimationFunction::HasChangedTarget(elem, smilAttr, isCSS) that
// we call here (in addition to HasChanged(), because even if function
// value hasn't changed, its target might have.
// For this to work, the nsSMILAnimationFunction needs to cache its last
// elem/smilAttr/isCSS values, and then check them against the new values
// here.
/*
if (!changed && curAnimFunc->HasChanged()) {
changed = PR_TRUE;
}
*/
if (curAnimFunc->WillReplace()) {
--i;
break;
}
}
// NOTE: 'i' is now the index of the first animation function that we need
// to use in compositing.
// if (!changed) // XXXdholbert removing until we have HasChangedTarget
// return;
// FOURTH: Compose animation functions (starting with base value)
nsSMILValue resultValue = smilAttr->GetBaseValue();
if (resultValue.IsNull()) {
NS_WARNING("nsISMILAttr::GetBaseValue failed");
return;
}
for (; i < length; ++i) {
nsSMILAnimationFunction* curAnimFunc = mAnimationFunctions[i];
if (curAnimFunc) {
curAnimFunc->ComposeResult(*smilAttr, resultValue);
}
}
// FIFTH: Set the animated value to the final composited result.
nsresult rv = smilAttr->SetAnimValue(resultValue);
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();
}