Creating framework for drawShadowedPicture

include/core/SkLights.h

Index: include/core/SkLights.h
diff --git a/include/core/SkLights.h b/include/core/SkLights.h
index c5c54276a39597909ff53a0465a6e97fee5a8743..0b23cc14aa01fa742133e5dfdf332f24d8e6a334 100644
--- a/include/core/SkLights.h
+++ b/include/core/SkLights.h
@@ -12,6 +12,7 @@
 #include "SkPoint3.h"
 #include "SkRefCnt.h"
 #include "../private/SkTDArray.h"
+#include "SkImage.h"
 
 class SK_API SkLights  : public SkRefCnt {
 public:
@@ -26,6 +27,7 @@ public:
             : fType(kAmbient_LightType)
             , fColor(color) {
             fDirection.set(0.0f, 0.0f, 1.0f);
+            fShadowMap.reset(nullptr);
         }
 
         Light(const SkColor3f& color, const SkVector3& dir)
@@ -35,6 +37,7 @@ public:
             if (!fDirection.normalize()) {
                 fDirection.set(0.0f, 0.0f, 1.0f);
             }
+            fShadowMap.reset(nullptr);
         }
 
         LightType type() const { return fType; }
@@ -44,11 +47,35 @@ public:
             return fDirection; 
         }
 
+        void setShadowMap(sk_sp<SkImage> shadowMap) {
+            fShadowMap = std::move(shadowMap);
+        }
+
+        sk_sp<SkImage> getShadowMap() const {
+            return fShadowMap;
+        }
+
+        Light& operator= (const Light& b) {
+            if (this == &b)
+                return *this;
+
+            this->fColor = b.fColor;
+            this->fType = b.fType;
+            this->fDirection = b.fDirection;
+
+            if (b.fShadowMap) {
+                this->fShadowMap = b.fShadowMap;
+            }
+
+            return *this;
+        }
+
     private:
         LightType   fType;
         SkColor3f   fColor;           // linear (unpremul) color. Range is 0..1 in each channel.
         SkVector3   fDirection;       // direction towards the light (+Z is out of the screen).
                                       // If degenerate, it will be replaced with (0, 0, 1).
+        sk_sp<SkImage> fShadowMap;
     };
 
     class Builder {
@@ -57,7 +84,7 @@ public:
     
         void add(const Light& light) {
             if (fLights) {
-                *fLights->fLights.push() = light;
+                (void) fLights->fLights.append(1, &light);
             }
         }
 
@@ -77,6 +104,10 @@ public:
         return fLights[index];
     }
 
+    Light& light(int index) {
+        return fLights[index];
+    }
+
 private:
     SkLights() {}