tor-browser

The Tor Browser
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nsCSSValue.cpp (3165B)

      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 /* representation of simple property values within CSS declarations */
      8 
      9 #include "nsCSSValue.h"
     10 
     11 #include "gfxFontConstants.h"
     12 #include "imgRequestProxy.h"
     13 #include "mozilla/CORSMode.h"
     14 #include "mozilla/FontPropertyTypes.h"
     15 #include "mozilla/ServoBindings.h"
     16 #include "mozilla/ServoStyleSet.h"
     17 #include "mozilla/ServoTypes.h"
     18 #include "mozilla/StyleSheetInlines.h"
     19 #include "mozilla/css/ImageLoader.h"
     20 #include "mozilla/dom/Document.h"
     21 #include "nsCSSProps.h"
     22 #include "nsContentUtils.h"
     23 #include "nsDeviceContext.h"
     24 #include "nsNetUtil.h"
     25 #include "nsPresContext.h"
     26 #include "nsStyleUtil.h"
     27 
     28 using namespace mozilla;
     29 using namespace mozilla::css;
     30 using namespace mozilla::dom;
     31 
     32 nsCSSValue::nsCSSValue(float aValue, nsCSSUnit aUnit) : mUnit(aUnit) {
     33  MOZ_ASSERT(eCSSUnit_Null == aUnit, "not a float value");
     34  mValue = aValue;
     35  MOZ_ASSERT(!std::isnan(mValue));
     36 }
     37 
     38 nsCSSValue::nsCSSValue(const nsCSSValue& aCopy) : mUnit(aCopy.mUnit) {
     39  if (eCSSUnit_Null != mUnit) {
     40    mValue = aCopy.mValue;
     41    MOZ_ASSERT(!std::isnan(mValue));
     42  } else {
     43    MOZ_ASSERT_UNREACHABLE("unknown unit");
     44  }
     45 }
     46 
     47 nsCSSValue& nsCSSValue::operator=(const nsCSSValue& aCopy) {
     48  if (this != &aCopy) {
     49    this->~nsCSSValue();
     50    new (this) nsCSSValue(aCopy);
     51  }
     52  return *this;
     53 }
     54 
     55 nsCSSValue& nsCSSValue::operator=(nsCSSValue&& aOther) {
     56  MOZ_ASSERT(this != &aOther, "Self assigment with rvalue reference");
     57 
     58  Reset();
     59  mUnit = aOther.mUnit;
     60  mValue = aOther.mValue;
     61  aOther.mUnit = eCSSUnit_Null;
     62 
     63  return *this;
     64 }
     65 
     66 bool nsCSSValue::operator==(const nsCSSValue& aOther) const {
     67  if (mUnit != aOther.mUnit) {
     68    return false;
     69  }
     70  return mValue == aOther.mValue;
     71 }
     72 
     73 nscoord nsCSSValue::GetPixelLength() const {
     74  MOZ_ASSERT(IsPixelLengthUnit(), "not a fixed length unit");
     75 
     76  double scaleFactor;
     77  switch (mUnit) {
     78    case eCSSUnit_Pixel:
     79      return nsPresContext::CSSPixelsToAppUnits(mValue);
     80    case eCSSUnit_Pica:
     81      scaleFactor = 16.0;
     82      break;
     83    case eCSSUnit_Point:
     84      scaleFactor = 4 / 3.0;
     85      break;
     86    case eCSSUnit_Inch:
     87      scaleFactor = 96.0;
     88      break;
     89    case eCSSUnit_Millimeter:
     90      scaleFactor = 96 / 25.4;
     91      break;
     92    case eCSSUnit_Centimeter:
     93      scaleFactor = 96 / 2.54;
     94      break;
     95    case eCSSUnit_Quarter:
     96      scaleFactor = 96 / 101.6;
     97      break;
     98    default:
     99      NS_ERROR("should never get here");
    100      return 0;
    101  }
    102  return nsPresContext::CSSPixelsToAppUnits(float(mValue * scaleFactor));
    103 }
    104 
    105 void nsCSSValue::SetPercentValue(float aValue) {
    106  Reset();
    107  mUnit = eCSSUnit_Percent;
    108  mValue = aValue;
    109  MOZ_ASSERT(!std::isnan(mValue));
    110 }
    111 
    112 void nsCSSValue::SetFloatValue(float aValue, nsCSSUnit aUnit) {
    113  MOZ_ASSERT(IsFloatUnit(aUnit), "not a float value");
    114  Reset();
    115  if (IsFloatUnit(aUnit)) {
    116    mUnit = aUnit;
    117    mValue = aValue;
    118    MOZ_ASSERT(!std::isnan(mValue));
    119  }
    120 }