add maskfilter to c api
BUG=skia:
TBR=
Review URL: https://codereview.chromium.org/822053002
diff --git a/include/c/sk_maskfilter.h b/include/c/sk_maskfilter.h
new file mode 100644
index 0000000..ce38605
--- /dev/null
+++ b/include/c/sk_maskfilter.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL
+// DO NOT USE -- FOR INTERNAL TESTING ONLY
+
+#ifndef sk_maskfilter_DEFINED
+#define sk_maskfilter_DEFINED
+
+#include "sk_types.h"
+
+typedef enum {
+ NORMAL_SK_BLUR_STYLE, //!< fuzzy inside and outside
+ SOLID_SK_BLUR_STYLE, //!< solid inside, fuzzy outside
+ OUTER_SK_BLUR_STYLE, //!< nothing inside, fuzzy outside
+ INNER_SK_BLUR_STYLE, //!< fuzzy inside, nothing outside
+} sk_blurstyle_t;
+
+SK_C_PLUS_PLUS_BEGIN_GUARD
+
+void sk_maskfilter_ref(sk_maskfilter_t*);
+void sk_maskfilter_unref(sk_maskfilter_t*);
+
+sk_maskfilter_t* sk_maskfilter_new_blur(sk_blurstyle_t, float sigma);
+
+SK_C_PLUS_PLUS_END_GUARD
+
+#endif