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-rw-r--r--layout/base/nsAutoLayoutPhase.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/layout/base/nsAutoLayoutPhase.h b/layout/base/nsAutoLayoutPhase.h
new file mode 100644
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+++ b/layout/base/nsAutoLayoutPhase.h
@@ -0,0 +1,49 @@
+/* -*- 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/. */
+
+#ifndef nsAutoLayoutPhase_h
+#define nsAutoLayoutPhase_h
+
+#ifdef DEBUG
+
+# include <stdint.h>
+
+enum class nsLayoutPhase : uint8_t;
+class nsPresContext;
+
+struct nsAutoLayoutPhase {
+ nsAutoLayoutPhase(nsPresContext* aPresContext, nsLayoutPhase aPhase);
+ ~nsAutoLayoutPhase();
+
+ void Enter();
+ void Exit();
+
+ private:
+ nsPresContext* mPresContext;
+ nsLayoutPhase mPhase;
+ uint32_t mCount;
+};
+
+# define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) \
+ nsAutoLayoutPhase autoLayoutPhase((pc_), (nsLayoutPhase::phase_))
+# define LAYOUT_PHASE_TEMP_EXIT() \
+ PR_BEGIN_MACRO \
+ autoLayoutPhase.Exit(); \
+ PR_END_MACRO
+# define LAYOUT_PHASE_TEMP_REENTER() \
+ PR_BEGIN_MACRO \
+ autoLayoutPhase.Enter(); \
+ PR_END_MACRO
+
+#else // DEBUG
+
+# define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) PR_BEGIN_MACRO PR_END_MACRO
+# define LAYOUT_PHASE_TEMP_EXIT() PR_BEGIN_MACRO PR_END_MACRO
+# define LAYOUT_PHASE_TEMP_REENTER() PR_BEGIN_MACRO PR_END_MACRO
+
+#endif // DEBUG
+
+#endif // nsAutoLayoutPhase_h