Initial error handling code

src/core/SkValidation.h

Index: src/core/SkValidation.h
diff --git a/src/core/SkValidation.h b/src/core/SkValidation.h
new file mode 100644
index 0000000000000000000000000000000000000000..dba7494e23ce81737017b9939c55bae3175cb6a4
--- /dev/null
+++ b/src/core/SkValidation.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkValidation_DEFINED

[reed1, 2013/09/04 18:49:36]

SkValidationUtils.h might be a more similar naming scheme for skia

[sugoi1, 2013/09/04 20:14:52]

Done.

+#define SkValidation_DEFINED
+
+#include "SkBitmap.h"
+#include "SkXfermode.h"
+
+/** Returns true if coeff's value is in the SkXfermode::Coeff enum.
+  */
+static inline bool IsValidCoeff(SkXfermode::Coeff coeff) {
+    return coeff >= 0 && coeff < SkXfermode::kCoeffCount;
+}
+
+/** Returns true if mode's value is in the SkXfermode::Mode enum.
+  */
+static inline bool IsValidMode(SkXfermode::Mode mode) {
+    return (mode >= 0) && (mode <= SkXfermode::kLastMode);
+}
+
+/** Returns true if config's value is in the SkBitmap::Config enum.
+  */
+static inline bool IsValidConfig(SkBitmap::Config config) {
+    return (config >= 0) && (config <= SkBitmap::kLastConfig);
+}
+
+#endif