1 files changed, 35 insertions, 0 deletions
diff --git a/src/gpu/effects/GrXfermodeFragmentProcessor.h b/src/gpu/effects/GrXfermodeFragmentProcessor.h
new file mode 100644
index 0000000000..edc5ae71e1
--- /dev/null
+++ b/src/gpu/effects/GrXfermodeFragmentProcessor.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrXfermodeFragmentProcessor_DEFINED
+#define GrXfermodeFragmentProcessor_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkBlendMode.h"
+
+class GrFragmentProcessor;
+
+namespace GrXfermodeFragmentProcessor {
+    /** The color input to the returned processor is treated as the src and the passed in processor
+        is the dst. */
+    sk_sp<GrFragmentProcessor> MakeFromDstProcessor(sk_sp<GrFragmentProcessor> dst,
+                                                    SkBlendMode mode);
+
+    /** The color input to the returned processor is treated as the dst and the passed in processor
+        is the src. */
+    sk_sp<GrFragmentProcessor> MakeFromSrcProcessor(sk_sp<GrFragmentProcessor> src,
+                                                    SkBlendMode mode);
+
+    /** Takes the input color, which is assumed to be unpremultiplied, passes it as an opaque color
+        to both src and dst. The outputs of a src and dst are blended using mode and the original
+        input's alpha is applied to the blended color to produce a premul output. */
+    sk_sp<GrFragmentProcessor> MakeFromTwoProcessors(sk_sp<GrFragmentProcessor> src,
+                                                     sk_sp<GrFragmentProcessor> dst,
+                                                     SkBlendMode mode);
+};
+
+#endif