gecko/content/smil/nsSMILCompositor.h
2011-10-17 10:59:28 -04:00

140 lines
5.4 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 ***** */
#ifndef NS_SMILCOMPOSITOR_H_
#define NS_SMILCOMPOSITOR_H_
#include "nsTHashtable.h"
#include "nsString.h"
#include "nsSMILAnimationFunction.h"
#include "nsSMILTargetIdentifier.h"
#include "nsSMILCompositorTable.h"
#include "pldhash.h"
//----------------------------------------------------------------------
// nsSMILCompositor
//
// Performs the composition of the animation sandwich by combining the results
// of a series animation functions according to the rules of SMIL composition
// including prioritising animations.
class nsSMILCompositor : public PLDHashEntryHdr
{
public:
typedef nsSMILTargetIdentifier KeyType;
typedef const KeyType& KeyTypeRef;
typedef const KeyType* KeyTypePointer;
explicit nsSMILCompositor(KeyTypePointer aKey)
: mKey(*aKey),
mForceCompositing(false)
{ }
nsSMILCompositor(const nsSMILCompositor& toCopy)
: mKey(toCopy.mKey),
mAnimationFunctions(toCopy.mAnimationFunctions),
mForceCompositing(false)
{ }
~nsSMILCompositor() { }
// PLDHashEntryHdr methods
KeyTypeRef GetKey() const { return mKey; }
bool KeyEquals(KeyTypePointer aKey) const;
static KeyTypePointer KeyToPointer(KeyTypeRef aKey) { return &aKey; }
static PLDHashNumber HashKey(KeyTypePointer aKey);
enum { ALLOW_MEMMOVE = false };
// Adds the given animation function to this Compositor's list of functions
void AddAnimationFunction(nsSMILAnimationFunction* aFunc);
// Composes the attribute's current value with the list of animation
// functions, and assigns the resulting value to this compositor's target
// attribute
void ComposeAttribute();
// Clears animation effects on my target attribute
void ClearAnimationEffects();
// Cycle-collection support
void Traverse(nsCycleCollectionTraversalCallback* aCallback);
// Toggles a bit that will force us to composite (bypassing early-return
// optimizations) when we hit ComposeAttribute.
void ToggleForceCompositing() { mForceCompositing = true; }
// Transfers |aOther|'s mCachedBaseValue to |this|
void StealCachedBaseValue(nsSMILCompositor* aOther) {
mCachedBaseValue = aOther->mCachedBaseValue;
}
private:
// Create a nsISMILAttr for my target, on the heap. Caller is responsible
// for deallocating the returned object.
nsISMILAttr* CreateSMILAttr();
// Finds the index of the first function that will affect our animation
// sandwich. Also toggles the 'mForceCompositing' flag if it finds that any
// (used) functions have changed.
PRUint32 GetFirstFuncToAffectSandwich();
// If the passed-in base value differs from our cached base value, this
// method updates the cached value (and toggles the 'mForceCompositing' flag)
void UpdateCachedBaseValue(const nsSMILValue& aBaseValue);
// Static callback methods
PR_STATIC_CALLBACK(PLDHashOperator) DoComposeAttribute(
nsSMILCompositor* aCompositor, void *aData);
// The hash key (tuple of element/attributeName/attributeType)
KeyType mKey;
// Hash Value: List of animation functions that animate the specified attr
nsTArray<nsSMILAnimationFunction*> mAnimationFunctions;
// Member data for detecting when we need to force-recompose
// ---------------------------------------------------------
// Flag for tracking whether we need to compose. Initialized to false, but
// gets flipped to true if we detect that something has changed.
bool mForceCompositing;
// Cached base value, so we can detect & force-recompose when it changes
// from one sample to the next. (nsSMILAnimationController copies this
// forward from the previous sample's compositor.)
nsAutoPtr<nsSMILValue> mCachedBaseValue;
};
#endif // NS_SMILCOMPOSITOR_H_