1 files changed, 39 insertions, 0 deletions
diff --git a/src/shaders/SkLightingShader.h b/src/shaders/SkLightingShader.h
new file mode 100644
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+++ b/src/shaders/SkLightingShader.h
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+/*
+ * 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 SkLightingShader_DEFINED
+#define SkLightingShader_DEFINED
+
+#include "SkLights.h"
+#include "SkShader.h"
+
+class SkBitmap;
+class SkMatrix;
+class SkNormalSource;
+
+class SK_API SkLightingShader {
+public:
+    /** Returns a shader that lights the shape, colored by the diffuseShader, using the
+        normals from normalSource, with the set of lights provided.
+
+        @param  diffuseShader     the shader that provides the colors. If nullptr, uses the paint's
+                                  color.
+        @param  normalSource      the source for the shape's normals. If nullptr, assumes straight
+                                  up normals (<0,0,1>).
+        @param  lights            the lights applied to the normals
+
+        The lighting equation is currently:
+            result = (LightColor * dot(Normal, LightDir) + AmbientColor) * DiffuseColor
+
+    */
+    static sk_sp<SkShader> Make(sk_sp<SkShader> diffuseShader, sk_sp<SkNormalSource> normalSource,
+                                sk_sp<SkLights> lights);
+
+    SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
+};
+
+#endif