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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/. */
#ifndef NS_SMILCOMPOSITOR_H_
#define NS_SMILCOMPOSITOR_H_
#include "mozilla/Move.h"
#include "nsAutoPtr.h"
#include "nsTHashtable.h"
#include "nsString.h"
#include "nsSMILAnimationFunction.h"
#include "nsSMILTargetIdentifier.h"
#include "nsSMILCompositorTable.h"
#include "PLDHashTable.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. If a change is made that might produce style updates,
// aMightHavePendingStyleUpdates is set to true. Otherwise it is not modified.
void ComposeAttribute(bool& aMightHavePendingStyleUpdates);
// 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 = mozilla::Move(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.
uint32_t 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);
// 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_
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