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comparison: dom/smil/nsSMILCompositor.h
dom/smil/nsSMILCompositor.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef NS_SMILCOMPOSITOR_H_ | |
| 7 #define NS_SMILCOMPOSITOR_H_ | |
| 8 | |
| 9 #include "nsTHashtable.h" | |
| 10 #include "nsString.h" | |
| 11 #include "nsSMILAnimationFunction.h" | |
| 12 #include "nsSMILTargetIdentifier.h" | |
| 13 #include "nsSMILCompositorTable.h" | |
| 14 #include "pldhash.h" | |
| 15 | |
| 16 //---------------------------------------------------------------------- | |
| 17 // nsSMILCompositor | |
| 18 // | |
| 19 // Performs the composition of the animation sandwich by combining the results | |
| 20 // of a series animation functions according to the rules of SMIL composition | |
| 21 // including prioritising animations. | |
| 22 | |
| 23 class nsSMILCompositor : public PLDHashEntryHdr | |
| 24 { | |
| 25 public: | |
| 26 typedef nsSMILTargetIdentifier KeyType; | |
| 27 typedef const KeyType& KeyTypeRef; | |
| 28 typedef const KeyType* KeyTypePointer; | |
| 29 | |
| 30 explicit nsSMILCompositor(KeyTypePointer aKey) | |
| 31 : mKey(*aKey), | |
| 32 mForceCompositing(false) | |
| 33 { } | |
| 34 nsSMILCompositor(const nsSMILCompositor& toCopy) | |
| 35 : mKey(toCopy.mKey), | |
| 36 mAnimationFunctions(toCopy.mAnimationFunctions), | |
| 37 mForceCompositing(false) | |
| 38 { } | |
| 39 ~nsSMILCompositor() { } | |
| 40 | |
| 41 // PLDHashEntryHdr methods | |
| 42 KeyTypeRef GetKey() const { return mKey; } | |
| 43 bool KeyEquals(KeyTypePointer aKey) const; | |
| 44 static KeyTypePointer KeyToPointer(KeyTypeRef aKey) { return &aKey; } | |
| 45 static PLDHashNumber HashKey(KeyTypePointer aKey); | |
| 46 enum { ALLOW_MEMMOVE = false }; | |
| 47 | |
| 48 // Adds the given animation function to this Compositor's list of functions | |
| 49 void AddAnimationFunction(nsSMILAnimationFunction* aFunc); | |
| 50 | |
| 51 // Composes the attribute's current value with the list of animation | |
| 52 // functions, and assigns the resulting value to this compositor's target | |
| 53 // attribute | |
| 54 void ComposeAttribute(); | |
| 55 | |
| 56 // Clears animation effects on my target attribute | |
| 57 void ClearAnimationEffects(); | |
| 58 | |
| 59 // Cycle-collection support | |
| 60 void Traverse(nsCycleCollectionTraversalCallback* aCallback); | |
| 61 | |
| 62 // Toggles a bit that will force us to composite (bypassing early-return | |
| 63 // optimizations) when we hit ComposeAttribute. | |
| 64 void ToggleForceCompositing() { mForceCompositing = true; } | |
| 65 | |
| 66 // Transfers |aOther|'s mCachedBaseValue to |this| | |
| 67 void StealCachedBaseValue(nsSMILCompositor* aOther) { | |
| 68 mCachedBaseValue = aOther->mCachedBaseValue; | |
| 69 } | |
| 70 | |
| 71 private: | |
| 72 // Create a nsISMILAttr for my target, on the heap. Caller is responsible | |
| 73 // for deallocating the returned object. | |
| 74 nsISMILAttr* CreateSMILAttr(); | |
| 75 | |
| 76 // Finds the index of the first function that will affect our animation | |
| 77 // sandwich. Also toggles the 'mForceCompositing' flag if it finds that any | |
| 78 // (used) functions have changed. | |
| 79 uint32_t GetFirstFuncToAffectSandwich(); | |
| 80 | |
| 81 // If the passed-in base value differs from our cached base value, this | |
| 82 // method updates the cached value (and toggles the 'mForceCompositing' flag) | |
| 83 void UpdateCachedBaseValue(const nsSMILValue& aBaseValue); | |
| 84 | |
| 85 // Static callback methods | |
| 86 static PLDHashOperator DoComposeAttribute( | |
| 87 nsSMILCompositor* aCompositor, void *aData); | |
| 88 | |
| 89 // The hash key (tuple of element/attributeName/attributeType) | |
| 90 KeyType mKey; | |
| 91 | |
| 92 // Hash Value: List of animation functions that animate the specified attr | |
| 93 nsTArray<nsSMILAnimationFunction*> mAnimationFunctions; | |
| 94 | |
| 95 // Member data for detecting when we need to force-recompose | |
| 96 // --------------------------------------------------------- | |
| 97 // Flag for tracking whether we need to compose. Initialized to false, but | |
| 98 // gets flipped to true if we detect that something has changed. | |
| 99 bool mForceCompositing; | |
| 100 | |
| 101 // Cached base value, so we can detect & force-recompose when it changes | |
| 102 // from one sample to the next. (nsSMILAnimationController copies this | |
| 103 // forward from the previous sample's compositor.) | |
| 104 nsAutoPtr<nsSMILValue> mCachedBaseValue; | |
| 105 }; | |
| 106 | |
| 107 #endif // NS_SMILCOMPOSITOR_H_ |
