Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/layout/style/nsCSSValue.h b/layout/style/nsCSSValue.h
new file mode 100644
index 0000000000..7dc4e2fa6d
--- /dev/null
+++ b/layout/style/nsCSSValue.h
@@ -0,0 +1,216 @@
+/* -*- 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/. */
+
+/* representation of simple property values within CSS declarations */
+
+#ifndef nsCSSValue_h___
+#define nsCSSValue_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/CORSMode.h"
+#include "mozilla/EnumTypeTraits.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/ServoBindingTypes.h"
+#include "mozilla/URLExtraData.h"
+#include "mozilla/UniquePtr.h"
+
+#include "nsCoord.h"
+#include "nsTArray.h"
+
+#include <type_traits>
+
+// XXX Avoid including this here by moving function bodies to the cpp file
+#include "mozilla/FloatingPoint.h"
+
+class imgRequestProxy;
+class nsAtom;
+class nsIContent;
+
+class nsIPrincipal;
+class nsIURI;
+class nsPresContext;
+template <class T>
+class nsPtrHashKey;
+struct RawServoCssUrlData;
+
+namespace mozilla {
+class CSSStyleSheet;
+}  // namespace mozilla
+
+// Forward declaration copied here since ServoBindings.h #includes nsCSSValue.h.
+extern "C" {
+mozilla::URLExtraData* Servo_CssUrlData_GetExtraData(const RawServoCssUrlData*);
+bool Servo_CssUrlData_IsLocalRef(const RawServoCssUrlData* url);
+}
+
+enum nsCSSUnit : uint32_t {
+  eCSSUnit_Null = 0,  // (n/a) null unit, value is not specified
+
+  eCSSUnit_Integer = 70,     // (int) simple value
+  eCSSUnit_Enumerated = 71,  // (int) value has enumerated meaning
+
+  eCSSUnit_Percent = 100,  // (float) (1.0 == 100%) value is percentage of
+                           // something
+  eCSSUnit_Number = 101,   // (float) value is numeric (usually multiplier,
+                           // different behavior than percent)
+
+  // Font relative measure
+  eCSSUnit_EM = 800,       // (float) == current font size
+  eCSSUnit_XHeight = 801,  // (float) distance from top of lower case x to
+                           // baseline
+  eCSSUnit_Char = 802,     // (float) number of characters, used for width with
+                           // monospace font
+  eCSSUnit_RootEM = 803,   // (float) == root element font size
+
+  // Screen relative measure
+  eCSSUnit_Point = 900,       // (float) 4/3 of a CSS pixel
+  eCSSUnit_Inch = 901,        // (float) 96 CSS pixels
+  eCSSUnit_Millimeter = 902,  // (float) 96/25.4 CSS pixels
+  eCSSUnit_Centimeter = 903,  // (float) 96/2.54 CSS pixels
+  eCSSUnit_Pica = 904,        // (float) 12 points == 16 CSS pixls
+  eCSSUnit_Quarter = 905,     // (float) 96/101.6 CSS pixels
+  eCSSUnit_Pixel = 906,       // (float) CSS pixel unit
+
+  // Angular units
+  eCSSUnit_Degree = 1000,  // (float) 360 per circle
+
+  // Frequency units
+  eCSSUnit_Hertz = 2000,      // (float) 1/seconds
+  eCSSUnit_Kilohertz = 2001,  // (float) 1000 Hertz
+
+  // Time units
+  eCSSUnit_Seconds = 3000,       // (float) Standard time
+  eCSSUnit_Milliseconds = 3001,  // (float) 1/1000 second
+
+  // Flexible fraction (CSS Grid)
+  eCSSUnit_FlexFraction = 4000,  // (float) Fraction of free space
+};
+
+struct nsCSSValuePair;
+struct nsCSSValuePair_heap;
+struct nsCSSValueList;
+struct nsCSSValueList_heap;
+struct nsCSSValueSharedList;
+struct nsCSSValuePairList;
+struct nsCSSValuePairList_heap;
+
+class nsCSSValue {
+ public:
+  explicit nsCSSValue() : mUnit(eCSSUnit_Null) {}
+
+  nsCSSValue(int32_t aValue, nsCSSUnit aUnit);
+  nsCSSValue(float aValue, nsCSSUnit aUnit);
+  nsCSSValue(const nsCSSValue& aCopy);
+  nsCSSValue(nsCSSValue&& aOther) : mUnit(aOther.mUnit), mValue(aOther.mValue) {
+    aOther.mUnit = eCSSUnit_Null;
+  }
+  template <typename T, typename = std::enable_if_t<std::is_enum<T>::value>>
+  explicit nsCSSValue(T aValue) : mUnit(eCSSUnit_Enumerated) {
+    static_assert(mozilla::EnumTypeFitsWithin<T, int32_t>::value,
+                  "aValue must be an enum that fits within mValue.mInt");
+    mValue.mInt = static_cast<int32_t>(aValue);
+  }
+
+  nsCSSValue& operator=(const nsCSSValue& aCopy);
+  nsCSSValue& operator=(nsCSSValue&& aCopy);
+  bool operator==(const nsCSSValue& aOther) const;
+
+  bool operator!=(const nsCSSValue& aOther) const { return !(*this == aOther); }
+
+  nsCSSUnit GetUnit() const { return mUnit; }
+  bool IsLengthUnit() const {
+    return eCSSUnit_EM <= mUnit && mUnit <= eCSSUnit_Pixel;
+  }
+  bool IsLengthPercentUnit() const {
+    return IsLengthUnit() || mUnit == eCSSUnit_Percent;
+  }
+  /**
+   * What the spec calls relative length units is, for us, split
+   * between relative length units and pixel length units.
+   *
+   * A "relative" length unit is a multiple of some derived metric,
+   * such as a font em-size, which itself was controlled by an input CSS
+   * length. Relative length units should not be scaled by zooming, since
+   * the underlying CSS length would already have been scaled.
+   */
+  bool IsRelativeLengthUnit() const {
+    return eCSSUnit_EM <= mUnit && mUnit <= eCSSUnit_RootEM;
+  }
+  /**
+   * A "pixel" length unit is a some multiple of CSS pixels.
+   */
+  static bool IsPixelLengthUnit(nsCSSUnit aUnit) {
+    return eCSSUnit_Point <= aUnit && aUnit <= eCSSUnit_Pixel;
+  }
+  bool IsPixelLengthUnit() const { return IsPixelLengthUnit(mUnit); }
+  static bool IsPercentLengthUnit(nsCSSUnit aUnit) {
+    return aUnit == eCSSUnit_Percent;
+  }
+  bool IsPercentLengthUnit() { return IsPercentLengthUnit(mUnit); }
+  static bool IsFloatUnit(nsCSSUnit aUnit) { return eCSSUnit_Number <= aUnit; }
+  bool IsAngularUnit() const { return eCSSUnit_Degree == mUnit; }
+  bool IsFrequencyUnit() const {
+    return eCSSUnit_Hertz <= mUnit && mUnit <= eCSSUnit_Kilohertz;
+  }
+  bool IsTimeUnit() const {
+    return eCSSUnit_Seconds <= mUnit && mUnit <= eCSSUnit_Milliseconds;
+  }
+
+  int32_t GetIntValue() const {
+    MOZ_ASSERT(mUnit == eCSSUnit_Integer || mUnit == eCSSUnit_Enumerated,
+               "not an int value");
+    return mValue.mInt;
+  }
+
+  float GetPercentValue() const {
+    MOZ_ASSERT(mUnit == eCSSUnit_Percent, "not a percent value");
+    return mValue.mFloat;
+  }
+
+  float GetFloatValue() const {
+    MOZ_ASSERT(eCSSUnit_Number <= mUnit, "not a float value");
+    MOZ_ASSERT(!std::isnan(mValue.mFloat));
+    return mValue.mFloat;
+  }
+
+  float GetAngleValue() const {
+    MOZ_ASSERT(eCSSUnit_Degree == mUnit, "not an angle value");
+    return mValue.mFloat;
+  }
+
+  // Converts any angle to radians.
+  double GetAngleValueInRadians() const;
+
+  // Converts any angle to degrees.
+  double GetAngleValueInDegrees() const;
+
+  nscoord GetPixelLength() const;
+
+  void Reset() { mUnit = eCSSUnit_Null; }
+  ~nsCSSValue() { Reset(); }
+
+ public:
+  void SetIntValue(int32_t aValue, nsCSSUnit aUnit);
+  template <typename T, typename = std::enable_if_t<std::is_enum<T>::value>>
+  void SetEnumValue(T aValue) {
+    static_assert(mozilla::EnumTypeFitsWithin<T, int32_t>::value,
+                  "aValue must be an enum that fits within mValue.mInt");
+    SetIntValue(static_cast<int32_t>(aValue), eCSSUnit_Enumerated);
+  }
+  void SetPercentValue(float aValue);
+  void SetFloatValue(float aValue, nsCSSUnit aUnit);
+  // converts the nscoord to pixels
+  void SetIntegerCoordValue(nscoord aCoord);
+
+ protected:
+  nsCSSUnit mUnit;
+  union {
+    int32_t mInt;
+    float mFloat;
+  } mValue;
+};
+
+#endif /* nsCSSValue_h___ */