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-rw-r--r--layout/base/BorderCache.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/layout/base/BorderCache.h b/layout/base/BorderCache.h
new file mode 100644
index 000000000..c70acf2ad
--- /dev/null
+++ b/layout/base/BorderCache.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; 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 mozilla_BorderCache_h_
+#define mozilla_BorderCache_h_
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/HashFunctions.h"
+#include "nsDataHashtable.h"
+#include "PLDHashTable.h"
+
+namespace mozilla {
+// Cache for best overlap and best dashLength.
+
+struct FourFloats
+{
+ typedef mozilla::gfx::Float Float;
+
+ Float n[4];
+
+ FourFloats()
+ {
+ n[0] = 0.0f;
+ n[1] = 0.0f;
+ n[2] = 0.0f;
+ n[3] = 0.0f;
+ }
+
+ FourFloats(Float a, Float b, Float c, Float d)
+ {
+ n[0] = a;
+ n[1] = b;
+ n[2] = c;
+ n[3] = d;
+ }
+
+ bool
+ operator==(const FourFloats& aOther) const
+ {
+ return n[0] == aOther.n[0] &&
+ n[1] == aOther.n[1] &&
+ n[2] == aOther.n[2] &&
+ n[3] == aOther.n[3];
+ }
+};
+
+class FourFloatsHashKey : public PLDHashEntryHdr
+{
+public:
+ typedef const FourFloats& KeyType;
+ typedef const FourFloats* KeyTypePointer;
+
+ explicit FourFloatsHashKey(KeyTypePointer aKey) : mValue(*aKey) {}
+ FourFloatsHashKey(const FourFloatsHashKey& aToCopy) : mValue(aToCopy.mValue) {}
+ ~FourFloatsHashKey() {}
+
+ KeyType GetKey() const { return mValue; }
+ bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mValue; }
+
+ static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
+ static PLDHashNumber HashKey(KeyTypePointer aKey)
+ {
+ return HashBytes(aKey->n, sizeof(mozilla::gfx::Float) * 4);
+ }
+ enum { ALLOW_MEMMOVE = true };
+
+private:
+ const FourFloats mValue;
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_BorderCache_h_ */