1 files changed, 103 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFontFeatures.h b/gfx/thebes/gfxFontFeatures.h
new file mode 100644
index 0000000000..24ece02d36
--- /dev/null
+++ b/gfx/thebes/gfxFontFeatures.h
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/* 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/. */
+
+#ifndef GFX_FONT_FEATURES_H
+#define GFX_FONT_FEATURES_H
+
+#include "nsAtom.h"
+#include "nsTHashtable.h"
+#include "nsTArray.h"
+#include "nsString.h"
+
+// An OpenType feature tag and value pair
+struct gfxFontFeature {
+  uint32_t
+      mTag;  // see http://www.microsoft.com/typography/otspec/featuretags.htm
+  uint32_t mValue;  // 0 = off, 1 = on, larger values may be used as parameters
+                    // to features that select among multiple alternatives
+};
+
+inline bool operator<(const gfxFontFeature& a, const gfxFontFeature& b) {
+  return (a.mTag < b.mTag) || ((a.mTag == b.mTag) && (a.mValue < b.mValue));
+}
+
+inline bool operator==(const gfxFontFeature& a, const gfxFontFeature& b) {
+  return (a.mTag == b.mTag) && (a.mValue == b.mValue);
+}
+
+class nsAtom;
+
+class gfxFontFeatureValueSet final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(gfxFontFeatureValueSet)
+
+  gfxFontFeatureValueSet();
+
+  struct ValueList {
+    ValueList(const nsAString& aName, const nsTArray<uint32_t>& aSelectors)
+        : name(aName), featureSelectors(aSelectors.Clone()) {}
+    nsString name;
+    nsTArray<uint32_t> featureSelectors;
+  };
+
+  struct FeatureValues {
+    uint32_t alternate;
+    nsTArray<ValueList> valuelist;
+  };
+
+  mozilla::Span<const uint32_t> GetFontFeatureValuesFor(
+      const nsACString& aFamily, uint32_t aVariantProperty,
+      nsAtom* aName) const;
+
+  // Appends a new hash entry with given key values and returns a pointer to
+  // mValues array to fill. This should be filled first.
+  nsTArray<uint32_t>* AppendFeatureValueHashEntry(const nsACString& aFamily,
+                                                  nsAtom* aName,
+                                                  uint32_t aAlternate);
+
+ private:
+  // Private destructor, to discourage deletion outside of Release():
+  ~gfxFontFeatureValueSet() = default;
+
+  struct FeatureValueHashKey {
+    nsCString mFamily;
+    uint32_t mPropVal;
+    RefPtr<nsAtom> mName;
+
+    FeatureValueHashKey() : mPropVal(0) {}
+    FeatureValueHashKey(const nsACString& aFamily, uint32_t aPropVal,
+                        nsAtom* aName)
+        : mFamily(aFamily), mPropVal(aPropVal), mName(aName) {}
+    FeatureValueHashKey(const FeatureValueHashKey& aKey) = default;
+  };
+
+  class FeatureValueHashEntry : public PLDHashEntryHdr {
+   public:
+    typedef const FeatureValueHashKey& KeyType;
+    typedef const FeatureValueHashKey* KeyTypePointer;
+
+    explicit FeatureValueHashEntry(KeyTypePointer aKey) {}
+    FeatureValueHashEntry(FeatureValueHashEntry&& other)
+        : PLDHashEntryHdr(std::move(other)),
+          mKey(std::move(other.mKey)),
+          mValues(std::move(other.mValues)) {
+      NS_ERROR("Should not be called");
+    }
+    ~FeatureValueHashEntry() = default;
+
+    bool KeyEquals(const KeyTypePointer aKey) const;
+    static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
+    static PLDHashNumber HashKey(const KeyTypePointer aKey);
+    enum { ALLOW_MEMMOVE = true };
+
+    FeatureValueHashKey mKey;
+    nsTArray<uint32_t> mValues;
+  };
+
+  nsTHashtable<FeatureValueHashEntry> mFontFeatureValues;
+};
+
+#endif