1 files changed, 148 insertions, 0 deletions
diff --git a/layout/style/nsCSSValue.h b/layout/style/nsCSSValue.h
new file mode 100644
index 0000000000..bc8914bbc1
--- /dev/null
+++ b/layout/style/nsCSSValue.h
@@ -0,0 +1,148 @@
+/* -*- 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_Percent = 100,  // (1.0 == 100%) value is percentage of
+                           // something
+  eCSSUnit_Number = 101,   // value is numeric (usually multiplier,
+                           // different behavior than percent)
+
+  // Font relative measure
+  eCSSUnit_EM = 800,           // == current font size
+  eCSSUnit_XHeight = 801,      // distance from top of lower case x to
+                               // baseline
+  eCSSUnit_Char = 802,         // number of characters, used for width with
+                               // monospace font
+  eCSSUnit_RootEM = 803,       // == root element font size
+  eCSSUnit_Ideographic = 804,  // == CJK water ideograph width
+  eCSSUnit_CapHeight = 805,    // == Capital letter height
+
+  // Screen relative measure
+  eCSSUnit_Point = 900,       // 4/3 of a CSS pixel
+  eCSSUnit_Inch = 901,        // 96 CSS pixels
+  eCSSUnit_Millimeter = 902,  // 96/25.4 CSS pixels
+  eCSSUnit_Centimeter = 903,  // 96/2.54 CSS pixels
+  eCSSUnit_Pica = 904,        // 12 points == 16 CSS pixls
+  eCSSUnit_Quarter = 905,     // 96/101.6 CSS pixels
+  eCSSUnit_Pixel = 906,       // CSS pixel unit
+
+  // Viewport percentage lengths
+  eCSSUnit_VW = 950,
+  eCSSUnit_VH = 951,
+  eCSSUnit_VMin = 952,
+  eCSSUnit_VMax = 953,
+};
+
+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(float aValue, nsCSSUnit aUnit);
+  nsCSSValue(const nsCSSValue& aCopy);
+  nsCSSValue(nsCSSValue&& aOther) : mUnit(aOther.mUnit), mValue(aOther.mValue) {
+    aOther.mUnit = eCSSUnit_Null;
+  }
+
+  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;
+  }
+  /**
+   * 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;
+  }
+  static bool IsFloatUnit(nsCSSUnit aUnit) { return eCSSUnit_Number <= aUnit; }
+
+  float GetPercentValue() const {
+    MOZ_ASSERT(mUnit == eCSSUnit_Percent, "not a percent value");
+    return mValue;
+  }
+
+  float GetFloatValue() const {
+    MOZ_ASSERT(eCSSUnit_Number <= mUnit, "not a float value");
+    MOZ_ASSERT(!std::isnan(mValue));
+    return mValue;
+  }
+
+  nscoord GetPixelLength() const;
+
+  void Reset() { mUnit = eCSSUnit_Null; }
+  ~nsCSSValue() { Reset(); }
+
+ public:
+  void SetPercentValue(float aValue);
+  void SetFloatValue(float aValue, nsCSSUnit aUnit);
+
+ protected:
+  nsCSSUnit mUnit;
+  float mValue;
+};
+
+#endif /* nsCSSValue_h___ */