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108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef NS_SMILCOMPOSITOR_H_
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#define NS_SMILCOMPOSITOR_H_
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#include "nsTHashtable.h"
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#include "nsString.h"
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#include "nsSMILAnimationFunction.h"
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#include "nsSMILTargetIdentifier.h"
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#include "nsSMILCompositorTable.h"
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#include "pldhash.h"
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//----------------------------------------------------------------------
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// nsSMILCompositor
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//
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// Performs the composition of the animation sandwich by combining the results
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// of a series animation functions according to the rules of SMIL composition
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// including prioritising animations.
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class nsSMILCompositor : public PLDHashEntryHdr
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{
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public:
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typedef nsSMILTargetIdentifier KeyType;
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typedef const KeyType& KeyTypeRef;
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typedef const KeyType* KeyTypePointer;
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explicit nsSMILCompositor(KeyTypePointer aKey)
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: mKey(*aKey),
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mForceCompositing(false)
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{ }
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nsSMILCompositor(const nsSMILCompositor& toCopy)
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: mKey(toCopy.mKey),
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mAnimationFunctions(toCopy.mAnimationFunctions),
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mForceCompositing(false)
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{ }
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~nsSMILCompositor() { }
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// PLDHashEntryHdr methods
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KeyTypeRef GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer aKey) const;
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static KeyTypePointer KeyToPointer(KeyTypeRef aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey);
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enum { ALLOW_MEMMOVE = false };
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// Adds the given animation function to this Compositor's list of functions
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void AddAnimationFunction(nsSMILAnimationFunction* aFunc);
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// Composes the attribute's current value with the list of animation
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// functions, and assigns the resulting value to this compositor's target
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// attribute
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void ComposeAttribute();
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// Clears animation effects on my target attribute
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void ClearAnimationEffects();
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// Cycle-collection support
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void Traverse(nsCycleCollectionTraversalCallback* aCallback);
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// Toggles a bit that will force us to composite (bypassing early-return
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// optimizations) when we hit ComposeAttribute.
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void ToggleForceCompositing() { mForceCompositing = true; }
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// Transfers |aOther|'s mCachedBaseValue to |this|
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void StealCachedBaseValue(nsSMILCompositor* aOther) {
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mCachedBaseValue = aOther->mCachedBaseValue;
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}
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private:
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// Create a nsISMILAttr for my target, on the heap. Caller is responsible
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// for deallocating the returned object.
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nsISMILAttr* CreateSMILAttr();
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// Finds the index of the first function that will affect our animation
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// sandwich. Also toggles the 'mForceCompositing' flag if it finds that any
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// (used) functions have changed.
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uint32_t GetFirstFuncToAffectSandwich();
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// If the passed-in base value differs from our cached base value, this
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// method updates the cached value (and toggles the 'mForceCompositing' flag)
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void UpdateCachedBaseValue(const nsSMILValue& aBaseValue);
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// Static callback methods
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PR_STATIC_CALLBACK(PLDHashOperator) DoComposeAttribute(
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nsSMILCompositor* aCompositor, void *aData);
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// The hash key (tuple of element/attributeName/attributeType)
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KeyType mKey;
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// Hash Value: List of animation functions that animate the specified attr
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nsTArray<nsSMILAnimationFunction*> mAnimationFunctions;
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// Member data for detecting when we need to force-recompose
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// ---------------------------------------------------------
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// Flag for tracking whether we need to compose. Initialized to false, but
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// gets flipped to true if we detect that something has changed.
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bool mForceCompositing;
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// Cached base value, so we can detect & force-recompose when it changes
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// from one sample to the next. (nsSMILAnimationController copies this
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// forward from the previous sample's compositor.)
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nsAutoPtr<nsSMILValue> mCachedBaseValue;
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};
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#endif // NS_SMILCOMPOSITOR_H_
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