Update skdiff.
https://codereview.appspot.com/6850115/
git-svn-id: http://skia.googlecode.com/svn/trunk@6681 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skdiff_utils.h b/tools/skdiff_utils.h
new file mode 100644
index 0000000..bd496b3
--- /dev/null
+++ b/tools/skdiff_utils.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef skdiff_utils_DEFINED
+#define skdiff_utils_DEFINED
+
+#include "skdiff.h"
+#include "SkImageDecoder.h"
+
+class SkBitmap;
+class SkData;
+class SkString;
+
+/** Returns true if the two buffers passed in are both non-NULL,
+ * have the same length, and contain exactly the same byte values.
+ */
+bool are_buffers_equal(SkData* skdata1, SkData* skdata2);
+
+/** Reads the file at the given path and returns its complete contents as an
+ * SkData object (or returns NULL on error).
+ */
+SkData* read_file(const char* file_path);
+
+/** Decodes the fileBits into the resource.fBitmap. Returns false on failure. */
+bool get_bitmap(SkData* fileBits, DiffResource& resource, SkImageDecoder::Mode mode);
+
+/** Writes the bitmap as a PNG to the path specified. */
+bool write_bitmap(const SkString& path, const SkBitmap& bitmap);
+
+/** Given an image filename, returns the name of the file containing
+ * the associated difference image.
+ */
+SkString filename_to_diff_filename(const SkString& filename);
+
+/** Given an image filename, returns the name of the file containing
+ * the "white" difference image.
+ */
+SkString filename_to_white_filename(const SkString& filename);
+
+/** Calls compute_diff and handles the difference and white diff resources.
+ * If !outputDir.isEmpty(), writes out difference and white images.
+ */
+void create_and_write_diff_image(DiffRecord* drp,
+ DiffMetricProc dmp,
+ const int colorThreshold,
+ const SkString& outputDir,
+ const SkString& filename);
+
+#endif