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220 lines
8.8 KiB
C++
220 lines
8.8 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_ISMILTYPE_H_
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#define NS_ISMILTYPE_H_
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#include "nscore.h"
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class nsSMILValue;
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//////////////////////////////////////////////////////////////////////////////
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// nsISMILType: Interface for defining the basic operations needed for animating
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// a particular kind of data (e.g. lengths, colors, transformation matrices).
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//
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// This interface is never used directly but always through an nsSMILValue that
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// bundles together a pointer to a concrete implementation of this interface and
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// the data upon which it should operate.
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//
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// We keep the data and type separate rather than just providing different
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// subclasses of nsSMILValue. This is so that sizeof(nsSMILValue) is the same
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// for all value types, allowing us to have a type-agnostic nsTArray of
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// nsSMILValue objects (actual objects, not pointers). It also allows most
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// nsSMILValues (except those that need to allocate extra memory for their
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// data) to be allocated on the stack and directly assigned to one another
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// provided performance benefits for the animation code.
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//
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// Note that different types have different capabilities. Roughly speaking there
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// are probably three main types:
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//
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// +---------------------+---------------+-------------+------------------+
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// | CATEGORY: | DISCRETE | LINEAR | ADDITIVE |
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// +---------------------+---------------+-------------+------------------+
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// | Example: | strings, | path data? | lengths, |
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// | | color k/words?| | RGB color values |
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// | | | | |
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// | -- Assign? | X | X | X |
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// | -- Add? | - | X? | X |
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// | -- SandwichAdd? | - | -? | X |
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// | -- ComputeDistance? | - | - | X? |
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// | -- Interpolate? | - | X | X |
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// +---------------------+---------------+-------------+------------------+
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//
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class nsISMILType
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{
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/**
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* Only give the nsSMILValue class access to this interface.
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*/
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friend class nsSMILValue;
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protected:
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/**
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* Initialises aValue and sets it to some identity value such that adding
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* aValue to another value of the same type has no effect.
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*
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* @pre aValue.IsNull()
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* @post aValue.mType == this
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*/
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virtual void Init(nsSMILValue& aValue) const = 0;
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/**
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* Destroys any data associated with a value of this type.
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*
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* @pre aValue.mType == this
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* @post aValue.IsNull()
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*/
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virtual void Destroy(nsSMILValue& aValue) const = 0;
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/**
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* Assign this object the value of another. Think of this as the assignment
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* operator.
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*
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* @param aDest The left-hand side of the assignment.
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* @param aSrc The right-hand side of the assignment.
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* @return NS_OK on success, an error code on failure such as when the
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* underlying type of the specified object differs.
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*
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* @pre aDest.mType == aSrc.mType == this
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*/
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virtual nsresult Assign(nsSMILValue& aDest,
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const nsSMILValue& aSrc) const = 0;
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/**
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* Test two nsSMILValue objects (of this nsISMILType) for equality.
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*
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* A return value of true represents a guarantee that aLeft and aRight are
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* equal. (That is, they would behave identically if passed to the methods
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* Add, SandwichAdd, ComputeDistance, and Interpolate).
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*
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* A return value of false simply indicates that we make no guarantee
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* about equality.
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*
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* NOTE: It's perfectly legal for implementations of this method to return
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* false in all cases. However, smarter implementations will make this
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* method more useful for optimization.
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*
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* @param aLeft The left-hand side of the equality check.
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* @param aRight The right-hand side of the equality check.
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* @return true if we're sure the values are equal, false otherwise.
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*
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* @pre aDest.mType == aSrc.mType == this
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*/
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virtual bool IsEqual(const nsSMILValue& aLeft,
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const nsSMILValue& aRight) const = 0;
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/**
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* Adds two values.
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*
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* The count parameter facilitates repetition.
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*
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* By equation,
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*
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* aDest += aValueToAdd * aCount
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*
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* Therefore, if aCount == 0, aDest will be unaltered.
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*
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* This method will fail if this data type is not additive or the value was
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* not specified using an additive syntax.
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*
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* See SVG 1.1, section 19.2.5. In particular,
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*
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* "If a given attribute or property can take values of keywords (which are
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* not additive) or numeric values (which are additive), then additive
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* animations are possible if the subsequent animation uses a numeric value
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* even if the base animation uses a keyword value; however, if the
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* subsequent animation uses a keyword value, additive animation is not
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* possible."
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*
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* If this method fails (e.g. because the data type is not additive), aDest
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* will be unaltered.
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*
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* @param aDest The value to add to.
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* @param aValueToAdd The value to add.
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* @param aCount The number of times to add aValueToAdd.
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* @return NS_OK on success, an error code on failure.
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*
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* @pre aValueToAdd.mType == aDest.mType == this
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*/
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virtual nsresult Add(nsSMILValue& aDest,
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const nsSMILValue& aValueToAdd,
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uint32_t aCount) const = 0;
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/**
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* Adds aValueToAdd to the underlying value in the animation sandwich, aDest.
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*
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* For most types this operation is identical to a regular Add() but for some
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* types (notably <animateTransform>) the operation differs. For
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* <animateTransform> Add() corresponds to simply adding together the
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* transform parameters and is used when calculating cumulative values or
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* by-animation values. On the other hand SandwichAdd() is used when adding to
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* the underlying value and requires matrix post-multiplication. (This
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* distinction is most clearly indicated by the SVGT1.2 test suite. It is not
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* obvious within the SMIL specifications.)
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*
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* @param aDest The value to add to.
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* @param aValueToAdd The value to add.
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* @return NS_OK on success, an error code on failure.
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*
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* @pre aValueToAdd.mType == aDest.mType == this
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*/
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virtual nsresult SandwichAdd(nsSMILValue& aDest,
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const nsSMILValue& aValueToAdd) const
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{
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return Add(aDest, aValueToAdd, 1);
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}
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/**
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* Calculates the 'distance' between two values. This is the distance used in
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* paced interpolation.
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*
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* @param aFrom The start of the interval for which the distance should
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* be calculated.
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* @param aTo The end of the interval for which the distance should be
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* calculated.
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* @param aDistance The result of the calculation.
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* @return NS_OK on success, or an appropriate error code if there is no
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* notion of distance for the underlying data type or the distance
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* could not be calculated.
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*
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* @pre aFrom.mType == aTo.mType == this
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*/
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virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
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const nsSMILValue& aTo,
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double& aDistance) const = 0;
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/**
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* Calculates an interpolated value between two values using the specified
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* proportion.
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*
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* @param aStartVal The value defining the start of the interval of
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* interpolation.
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* @param aEndVal The value defining the end of the interval of
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* interpolation.
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* @param aUnitDistance A number between 0.0 and 1.0 (inclusive) defining
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* the distance of the interpolated value in the
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* interval.
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* @param aResult The interpolated value.
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* @return NS_OK on success, NS_ERROR_FAILURE if this data type cannot be
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* interpolated or NS_ERROR_OUT_OF_MEMORY if insufficient memory was
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* available for storing the result.
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*
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* @pre aStartVal.mType == aEndVal.mType == aResult.mType == this
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*/
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virtual nsresult Interpolate(const nsSMILValue& aStartVal,
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const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const = 0;
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/**
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* Protected destructor, to ensure that no one accidentally deletes an
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* instance of this class.
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* (The only instances in existence should be singletons - one per subclass.)
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*/
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~nsISMILType() {}
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};
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#endif // NS_ISMILTYPE_H_
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