1 files changed, 53 insertions, 0 deletions
diff --git a/layout/style/RuleNodeCacheConditions.cpp b/layout/style/RuleNodeCacheConditions.cpp
new file mode 100644
index 000000000..2dbb6c344
--- /dev/null
+++ b/layout/style/RuleNodeCacheConditions.cpp
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=78: */
+/* 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/. */
+
+/*
+ * an object that stores the result of determining whether a style struct that
+ * was computed can be cached in the rule tree, and if so, what the cache
+ * key is
+ */
+
+#include "RuleNodeCacheConditions.h"
+
+#include "nsStyleContext.h"
+#include "WritingModes.h"
+
+using namespace mozilla;
+
+bool
+RuleNodeCacheConditions::Matches(nsStyleContext* aStyleContext) const
+{
+  MOZ_ASSERT(Cacheable());
+  if ((mBits & eHaveFontSize) &&
+      mFontSize != aStyleContext->StyleFont()->mFont.size) {
+    return false;
+  }
+  if ((mBits & eHaveWritingMode) &&
+      (GetWritingMode() != WritingMode(aStyleContext).GetBits())) {
+    return false;
+  }
+  return true;
+}
+
+#ifdef DEBUG
+void
+RuleNodeCacheConditions::List() const
+{
+  printf("{ ");
+  bool first = true;
+  if (mBits & eHaveFontSize) {
+    printf("FontSize(%d)", mFontSize);
+    first = false;
+  }
+  if (mBits & eHaveWritingMode) {
+    if (!first) {
+      printf(", ");
+    }
+    printf("WritingMode(0x%x)", GetWritingMode());
+  }
+  printf(" }");
+}
+#endif