add yee's perceptual metric
R=bsalomon@google.com
Review URL: https://codereview.chromium.org/18066004
git-svn-id: http://skia.googlecode.com/svn/trunk@9803 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/skpdiff/SkPMetric.h b/experimental/skpdiff/SkPMetric.h
new file mode 100644
index 0000000..fb32db5
--- /dev/null
+++ b/experimental/skpdiff/SkPMetric.h
@@ -0,0 +1,37 @@
+/*
+ * 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 SkPMetric_DEFINED
+#define SkPMetric_DEFINED
+
+#include "SkTDArray.h"
+
+#include "SkImageDiffer.h"
+
+/**
+ * An image differ that uses the pdiff image metric to compare images.
+ */
+class SkPMetric : public SkImageDiffer {
+public:
+ virtual const char* getName() SK_OVERRIDE;
+ virtual int queueDiff(SkBitmap* baseline, SkBitmap* test) SK_OVERRIDE;
+ virtual bool isFinished(int id) SK_OVERRIDE;
+ virtual double getResult(int id) SK_OVERRIDE;
+
+private:
+ struct QueuedDiff {
+ bool finished;
+ double result;
+ };
+
+ SkTDArray<QueuedDiff> fQueuedDiffs;
+
+ typedef SkImageDiffer INHERITED;
+};
+
+
+#endif