create imagepriv and name params

Named all parameters and made the names consistent
for documentation.

Moved SK_IMAGEFILTER_UNFLATTEN_COMMON to private file.

TBR=reed@google.com
Bug: skia:6898
Change-Id: I1343d2b16d4217088fa3bc9c40f1f4177fa32740
Reviewed-on: https://skia-review.googlesource.com/66521
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/core/SkImageFilterPriv.h b/src/core/SkImageFilterPriv.h
new file mode 100644
index 0000000000..dff3e0c68a
--- /dev/null
+++ b/src/core/SkImageFilterPriv.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkImageFilterPriv_DEFINED
+#define SkImageFilterPriv_DEFINED
+
+#include "SkImageFilter.h"
+
+/**
+ *  Helper to unflatten the common data, and return nullptr if we fail.
+ */
+#define SK_IMAGEFILTER_UNFLATTEN_COMMON(localVar, expectedCount)    \
+    Common localVar;                                                \
+    do {                                                            \
+        if (!localVar.unflatten(buffer, expectedCount)) {           \
+            return nullptr;                                         \
+        }                                                           \
+    } while (0)
+
+#endif