зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
5.0 KiB
C++
129 строки
5.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 DOM_SMIL_SMILCOMPOSITOR_H_
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#define DOM_SMIL_SMILCOMPOSITOR_H_
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#include <utility>
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#include "PLDHashTable.h"
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#include "SMILTargetIdentifier.h"
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#include "mozilla/SMILAnimationFunction.h"
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#include "mozilla/SMILCompositorTable.h"
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#include "mozilla/UniquePtr.h"
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#include "nsCSSPropertyID.h"
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#include "nsString.h"
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#include "nsTHashtable.h"
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namespace mozilla {
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class ComputedStyle;
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//----------------------------------------------------------------------
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// SMILCompositor
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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 SMILCompositor : public PLDHashEntryHdr {
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public:
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using KeyType = SMILTargetIdentifier;
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using KeyTypeRef = const KeyType&;
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using KeyTypePointer = const KeyType*;
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explicit SMILCompositor(KeyTypePointer aKey)
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: mKey(*aKey), mForceCompositing(false) {}
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SMILCompositor(SMILCompositor&& toMove) noexcept
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: PLDHashEntryHdr(std::move(toMove)),
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mKey(std::move(toMove.mKey)),
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mAnimationFunctions(std::move(toMove.mAnimationFunctions)),
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mForceCompositing(false) {}
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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(SMILAnimationFunction* 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. If a change is made that might produce style updates,
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// aMightHavePendingStyleUpdates is set to true. Otherwise it is not modified.
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void ComposeAttribute(bool& aMightHavePendingStyleUpdates);
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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(SMILCompositor* aOther) {
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mCachedBaseValue = std::move(aOther->mCachedBaseValue);
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}
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private:
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// Create a SMILAttr for my target, on the heap.
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//
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// @param aBaseComputedStyle An optional ComputedStyle which, if set, will be
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// used when fetching the base style.
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UniquePtr<SMILAttr> CreateSMILAttr(const ComputedStyle* aBaseComputedStyle);
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// Returns the CSS property this compositor should animate, or
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// eCSSProperty_UNKNOWN if this compositor does not animate a CSS property.
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nsCSSPropertyID GetCSSPropertyToAnimate() const;
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// Returns true if we might need to refer to base styles (i.e. we are
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// targeting a CSS property and have one or more animation functions that
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// don't just replace the underlying value).
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//
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// This might return true in some cases where we don't actually need the base
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// style since it doesn't build up the animation sandwich to check if the
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// functions that appear to need the base style are actually replaced by
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// a function further up the stack.
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bool MightNeedBaseStyle() const;
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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 SMILValue& aBaseValue);
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// The hash key (tuple of element and attributeName)
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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<SMILAnimationFunction*> 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. (SMILAnimationController moves this
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// forward from the previous sample's compositor by calling
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// StealCachedBaseValue.)
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SMILValue mCachedBaseValue;
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};
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} // namespace mozilla
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#endif // DOM_SMIL_SMILCOMPOSITOR_H_
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