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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 "SVGViewBoxSMILType.h"
#include "mozilla/SMILValue.h"
#include "nsDebug.h"
#include "SVGAnimatedViewBox.h"
#include <math.h>
namespace mozilla {
/*static*/
SVGViewBoxSMILType SVGViewBoxSMILType::sSingleton;
void SVGViewBoxSMILType::Init(SMILValue& aValue) const {
MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
aValue.mU.mPtr = new SVGViewBox();
aValue.mType = this;
}
void SVGViewBoxSMILType::Destroy(SMILValue& aValue) const {
MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value");
delete static_cast<SVGViewBox*>(aValue.mU.mPtr);
aValue.mU.mPtr = nullptr;
aValue.mType = SMILNullType::Singleton();
}
nsresult SVGViewBoxSMILType::Assign(SMILValue& aDest,
const SMILValue& aSrc) const {
MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value");
const SVGViewBox* src = static_cast<const SVGViewBox*>(aSrc.mU.mPtr);
SVGViewBox* dst = static_cast<SVGViewBox*>(aDest.mU.mPtr);
*dst = *src;
return NS_OK;
}
bool SVGViewBoxSMILType::IsEqual(const SMILValue& aLeft,
const SMILValue& aRight) const {
MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
const SVGViewBox* leftBox = static_cast<const SVGViewBox*>(aLeft.mU.mPtr);
const SVGViewBox* rightBox = static_cast<SVGViewBox*>(aRight.mU.mPtr);
return *leftBox == *rightBox;
}
nsresult SVGViewBoxSMILType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
uint32_t aCount) const {
MOZ_ASSERT(aValueToAdd.mType == aDest.mType, "Trying to add invalid types");
MOZ_ASSERT(aValueToAdd.mType == this, "Unexpected source type");
// See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c3 and the two
// comments that follow that one for arguments for and against allowing
// viewBox to be additive.
return NS_ERROR_FAILURE;
}
nsresult SVGViewBoxSMILType::ComputeDistance(const SMILValue& aFrom,
const SMILValue& aTo,
double& aDistance) const {
MOZ_ASSERT(aFrom.mType == aTo.mType, "Trying to compare different types");
MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
const SVGViewBox* from = static_cast<const SVGViewBox*>(aFrom.mU.mPtr);
const SVGViewBox* to = static_cast<const SVGViewBox*>(aTo.mU.mPtr);
if (from->none || to->none) {
return NS_ERROR_FAILURE;
}
// We use the distances between the edges rather than the difference between
// the x, y, width and height for the "distance". This is necessary in
// order for the "distance" result that we calculate to be the same for a
// given change in the left side as it is for an equal change in the opposite
// side. See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c12
float dLeft = to->x - from->x;
float dTop = to->y - from->y;
float dRight = (to->x + to->width) - (from->x + from->width);
float dBottom = (to->y + to->height) - (from->y + from->height);
aDistance = std::sqrt(dLeft * dLeft + dTop * dTop + dRight * dRight +
dBottom * dBottom);
return NS_OK;
}
nsresult SVGViewBoxSMILType::Interpolate(const SMILValue& aStartVal,
const SMILValue& aEndVal,
double aUnitDistance,
SMILValue& aResult) const {
MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
"Trying to interpolate different types");
MOZ_ASSERT(aStartVal.mType == this, "Unexpected types for interpolation");
MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
const SVGViewBox* start = static_cast<const SVGViewBox*>(aStartVal.mU.mPtr);
const SVGViewBox* end = static_cast<const SVGViewBox*>(aEndVal.mU.mPtr);
if (start->none || end->none) {
return NS_ERROR_FAILURE;
}
SVGViewBox* current = static_cast<SVGViewBox*>(aResult.mU.mPtr);
float x = (start->x + (end->x - start->x) * aUnitDistance);
float y = (start->y + (end->y - start->y) * aUnitDistance);
float width = (start->width + (end->width - start->width) * aUnitDistance);
float height =
(start->height + (end->height - start->height) * aUnitDistance);
*current = SVGViewBox(x, y, width, height);
return NS_OK;
}
} // namespace mozilla
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