tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

SVGViewBoxSMILType.cpp (5010B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "SVGViewBoxSMILType.h"
      8 
      9 #include <math.h>
     10 
     11 #include "SVGAnimatedViewBox.h"
     12 #include "mozilla/SMILValue.h"
     13 #include "nsDebug.h"
     14 
     15 namespace mozilla {
     16 
     17 /*static*/
     18 SVGViewBoxSMILType SVGViewBoxSMILType::sSingleton;
     19 
     20 void SVGViewBoxSMILType::InitValue(SMILValue& aValue) const {
     21  MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
     22 
     23  aValue.mU.mPtr = new SVGViewBox(0.0f, 0.0f, 0.0f, 0.0f);
     24  aValue.mType = this;
     25 }
     26 
     27 void SVGViewBoxSMILType::DestroyValue(SMILValue& aValue) const {
     28  MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value");
     29  delete static_cast<SVGViewBox*>(aValue.mU.mPtr);
     30  aValue.mU.mPtr = nullptr;
     31  aValue.mType = SMILNullType::Singleton();
     32 }
     33 
     34 nsresult SVGViewBoxSMILType::Assign(SMILValue& aDest,
     35                                    const SMILValue& aSrc) const {
     36  MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
     37  MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value");
     38 
     39  const SVGViewBox* src = static_cast<const SVGViewBox*>(aSrc.mU.mPtr);
     40  SVGViewBox* dst = static_cast<SVGViewBox*>(aDest.mU.mPtr);
     41  *dst = *src;
     42  return NS_OK;
     43 }
     44 
     45 bool SVGViewBoxSMILType::IsEqual(const SMILValue& aLeft,
     46                                 const SMILValue& aRight) const {
     47  MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
     48  MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
     49 
     50  const SVGViewBox* leftBox = static_cast<const SVGViewBox*>(aLeft.mU.mPtr);
     51  const SVGViewBox* rightBox = static_cast<SVGViewBox*>(aRight.mU.mPtr);
     52  return *leftBox == *rightBox;
     53 }
     54 
     55 nsresult SVGViewBoxSMILType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
     56                                 uint32_t aCount) const {
     57  MOZ_ASSERT(aValueToAdd.mType == aDest.mType, "Trying to add invalid types");
     58  MOZ_ASSERT(aValueToAdd.mType == this, "Unexpected source type");
     59 
     60  auto* dest = static_cast<SVGViewBox*>(aDest.mU.mPtr);
     61  const auto* valueToAdd = static_cast<const SVGViewBox*>(aValueToAdd.mU.mPtr);
     62 
     63  if (dest->none || valueToAdd->none) {
     64    return NS_ERROR_FAILURE;
     65  }
     66 
     67  dest->x += valueToAdd->x * aCount;
     68  dest->y += valueToAdd->y * aCount;
     69  dest->width += valueToAdd->width * aCount;
     70  dest->height += valueToAdd->height * aCount;
     71 
     72  return NS_OK;
     73 }
     74 
     75 nsresult SVGViewBoxSMILType::ComputeDistance(const SMILValue& aFrom,
     76                                             const SMILValue& aTo,
     77                                             double& aDistance) const {
     78  MOZ_ASSERT(aFrom.mType == aTo.mType, "Trying to compare different types");
     79  MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
     80 
     81  const SVGViewBox* from = static_cast<const SVGViewBox*>(aFrom.mU.mPtr);
     82  const SVGViewBox* to = static_cast<const SVGViewBox*>(aTo.mU.mPtr);
     83 
     84  if (from->none || to->none) {
     85    return NS_ERROR_FAILURE;
     86  }
     87 
     88  // We use the distances between the edges rather than the difference between
     89  // the x, y, width and height for the "distance". This is necessary in
     90  // order for the "distance" result that we calculate to be the same for a
     91  // given change in the left side as it is for an equal change in the opposite
     92  // side. See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c12
     93 
     94  double dLeft = to->x - from->x;
     95  double dTop = to->y - from->y;
     96  double dRight = (to->x + to->width) - (from->x + from->width);
     97  double dBottom = (to->y + to->height) - (from->y + from->height);
     98 
     99  aDistance = std::sqrt(dLeft * dLeft + dTop * dTop + dRight * dRight +
    100                        dBottom * dBottom);
    101 
    102  return NS_OK;
    103 }
    104 
    105 nsresult SVGViewBoxSMILType::Interpolate(const SMILValue& aStartVal,
    106                                         const SMILValue& aEndVal,
    107                                         double aUnitDistance,
    108                                         SMILValue& aResult) const {
    109  MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
    110             "Trying to interpolate different types");
    111  MOZ_ASSERT(aStartVal.mType == this, "Unexpected types for interpolation");
    112  MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
    113 
    114  const SVGViewBox* start = static_cast<const SVGViewBox*>(aStartVal.mU.mPtr);
    115  const SVGViewBox* end = static_cast<const SVGViewBox*>(aEndVal.mU.mPtr);
    116 
    117  if (start->none || end->none) {
    118    return NS_ERROR_FAILURE;
    119  }
    120 
    121  SVGViewBox* current = static_cast<SVGViewBox*>(aResult.mU.mPtr);
    122 
    123  float x = (start->x + (end->x - start->x) * aUnitDistance);
    124  float y = (start->y + (end->y - start->y) * aUnitDistance);
    125  float width = (start->width + (end->width - start->width) * aUnitDistance);
    126  float height =
    127      (start->height + (end->height - start->height) * aUnitDistance);
    128 
    129  *current = SVGViewBox(x, y, width, height);
    130 
    131  return NS_OK;
    132 }
    133 
    134 }  // namespace mozilla