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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/. */
#include "SVGNumberListSMILType.h"
#include "nsSMILValue.h"
#include "SVGNumberList.h"
#include "nsMathUtils.h"
#include "mozilla/FloatingPoint.h"
#include <math.h>
/* The "identity" number list for a given number list attribute (the effective
* number list that is used if an attribute value is not specified) varies
* widely for different number list attributes, and can depend on the value of
* other attributes on the same element:
*
* http://www.w3.org/TR/SVG11/filters.html#feColorMatrixValuesAttribute
* http://www.w3.org/TR/SVG11/filters.html#feComponentTransferTableValuesAttribute
* http://www.w3.org/TR/SVG11/filters.html#feConvolveMatrixElementKernelMatrixAttribute
* http://www.w3.org/TR/SVG11/text.html#TextElementRotateAttribute
*
* Note that we don't need to worry about that variation here, however. The way
* that the SMIL engine creates and composites sandwich layers together allows
* us to treat "identity" nsSMILValue objects as a number list of zeros. Such
* identity nsSMILValues are identified by the fact that their
# SVGNumberListAndInfo has not been given an element yet.
*/
namespace mozilla {
/*static*/ SVGNumberListSMILType SVGNumberListSMILType::sSingleton;
//----------------------------------------------------------------------
// nsISMILType implementation
void
SVGNumberListSMILType::Init(nsSMILValue &aValue) const
{
MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
SVGNumberListAndInfo* numberList = new SVGNumberListAndInfo();
aValue.mU.mPtr = numberList;
aValue.mType = this;
}
void
SVGNumberListSMILType::Destroy(nsSMILValue& aValue) const
{
NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value type");
delete static_cast<SVGNumberListAndInfo*>(aValue.mU.mPtr);
aValue.mU.mPtr = nullptr;
aValue.mType = nsSMILNullType::Singleton();
}
nsresult
SVGNumberListSMILType::Assign(nsSMILValue& aDest,
const nsSMILValue& aSrc) const
{
NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
const SVGNumberListAndInfo* src =
static_cast<const SVGNumberListAndInfo*>(aSrc.mU.mPtr);
SVGNumberListAndInfo* dest =
static_cast<SVGNumberListAndInfo*>(aDest.mU.mPtr);
return dest->CopyFrom(*src);
}
bool
SVGNumberListSMILType::IsEqual(const nsSMILValue& aLeft,
const nsSMILValue& aRight) const
{
NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
return *static_cast<const SVGNumberListAndInfo*>(aLeft.mU.mPtr) ==
*static_cast<const SVGNumberListAndInfo*>(aRight.mU.mPtr);
}
nsresult
SVGNumberListSMILType::Add(nsSMILValue& aDest,
const nsSMILValue& aValueToAdd,
uint32_t aCount) const
{
NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL type");
NS_PRECONDITION(aValueToAdd.mType == this, "Incompatible SMIL type");
SVGNumberListAndInfo& dest =
*static_cast<SVGNumberListAndInfo*>(aDest.mU.mPtr);
const SVGNumberListAndInfo& valueToAdd =
*static_cast<const SVGNumberListAndInfo*>(aValueToAdd.mU.mPtr);
MOZ_ASSERT(dest.Element() || valueToAdd.Element(),
"Target element propagation failure");
if (!valueToAdd.Element()) {
MOZ_ASSERT(valueToAdd.Length() == 0,
"Not identity value - target element propagation failure");
return NS_OK;
}
if (!dest.Element()) {
MOZ_ASSERT(dest.Length() == 0,
"Not identity value - target element propagation failure");
if (!dest.SetLength(valueToAdd.Length())) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (uint32_t i = 0; i < dest.Length(); ++i) {
dest[i] = aCount * valueToAdd[i];
}
dest.SetInfo(valueToAdd.Element()); // propagate target element info!
return NS_OK;
}
MOZ_ASSERT(dest.Element() == valueToAdd.Element(),
"adding values from different elements...?");
if (dest.Length() != valueToAdd.Length()) {
// For now we only support animation between lists with the same number of
// items. SVGContentUtils::ReportToConsole
return NS_ERROR_FAILURE;
}
for (uint32_t i = 0; i < dest.Length(); ++i) {
dest[i] += aCount * valueToAdd[i];
}
dest.SetInfo(valueToAdd.Element()); // propagate target element info!
return NS_OK;
}
nsresult
SVGNumberListSMILType::ComputeDistance(const nsSMILValue& aFrom,
const nsSMILValue& aTo,
double& aDistance) const
{
NS_PRECONDITION(aFrom.mType == this, "Unexpected SMIL type");
NS_PRECONDITION(aTo.mType == this, "Incompatible SMIL type");
const SVGNumberListAndInfo& from =
*static_cast<const SVGNumberListAndInfo*>(aFrom.mU.mPtr);
const SVGNumberListAndInfo& to =
*static_cast<const SVGNumberListAndInfo*>(aTo.mU.mPtr);
if (from.Length() != to.Length()) {
// Lists in the 'values' attribute must have the same length.
// SVGContentUtils::ReportToConsole
return NS_ERROR_FAILURE;
}
// We return the root of the sum of the squares of the delta between the
// numbers at each correspanding index.
double total = 0.0;
for (uint32_t i = 0; i < to.Length(); ++i) {
double delta = to[i] - from[i];
total += delta * delta;
}
double distance = sqrt(total);
if (!IsFinite(distance)) {
return NS_ERROR_FAILURE;
}
aDistance = distance;
return NS_OK;
}
nsresult
SVGNumberListSMILType::Interpolate(const nsSMILValue& aStartVal,
const nsSMILValue& aEndVal,
double aUnitDistance,
nsSMILValue& aResult) const
{
NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
"Trying to interpolate different types");
NS_PRECONDITION(aStartVal.mType == this,
"Unexpected types for interpolation");
NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
const SVGNumberListAndInfo& start =
*static_cast<const SVGNumberListAndInfo*>(aStartVal.mU.mPtr);
const SVGNumberListAndInfo& end =
*static_cast<const SVGNumberListAndInfo*>(aEndVal.mU.mPtr);
SVGNumberListAndInfo& result =
*static_cast<SVGNumberListAndInfo*>(aResult.mU.mPtr);
MOZ_ASSERT(end.Element(), "Can't propagate target element");
MOZ_ASSERT(start.Element() == end.Element() || !start.Element(),
"Different target elements");
if (start.Element() && // 'start' is not an "identity" value
start.Length() != end.Length()) {
// For now we only support animation between lists of the same length.
// SVGContentUtils::ReportToConsole
return NS_ERROR_FAILURE;
}
if (!result.SetLength(end.Length())) {
return NS_ERROR_OUT_OF_MEMORY;
}
result.SetInfo(end.Element()); // propagate target element info!
if (start.Length() != end.Length()) {
MOZ_ASSERT(start.Length() == 0, "Not an identity value");
for (uint32_t i = 0; i < end.Length(); ++i) {
result[i] = aUnitDistance * end[i];
}
return NS_OK;
}
for (uint32_t i = 0; i < end.Length(); ++i) {
result[i] = start[i] + (end[i] - start[i]) * aUnitDistance;
}
return NS_OK;
}
} // namespace mozilla
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