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