Creating framework for drawShadowedPicture

include/core/SkLights.h

 
 /*
  * 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 SkLights_DEFINED
 #define SkLights_DEFINED
 
 #include "SkPoint3.h"
 #include "SkRefCnt.h"
 #include "../private/SkTDArray.h"
+#include "SkImage.h"
 
 class SK_API SkLights  : public SkRefCnt {
 public:
     class Light {
     public:
         enum LightType {
             kAmbient_LightType,       // only 'fColor' is used
             kDirectional_LightType
         };
 
         Light(const SkColor3f& color)
             : fType(kAmbient_LightType)
-            , fColor(color) {
+            , fColor(color)
+            , fShadowMap(nullptr) {
             fDirection.set(0.0f, 0.0f, 1.0f);
         }
 
         Light(const SkColor3f& color, const SkVector3& dir)
             : fType(kDirectional_LightType)
             , fColor(color)
-            , fDirection(dir) {
+            , fDirection(dir)
+            , fShadowMap(nullptr) {
             if (!fDirection.normalize()) {
                 fDirection.set(0.0f, 0.0f, 1.0f);
             }
         }
 
         LightType type() const { return fType; }
         const SkColor3f& color() const { return fColor; }
         const SkVector3& dir() const { 
             SkASSERT(kAmbient_LightType != fType);
             return fDirection; 
         }
 
+        void setShadowMap(sk_sp<SkImage> shadowMap) {
+            fShadowMap = shadowMap.get();
+        }
+
     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).
+        SkImage* fShadowMap; // if we use an sk_sp, this freaking breaks because it's init to nullptr
     };
 
     class Builder {
     public:
         Builder() : fLights(new SkLights) { }
     
         void add(const Light& light) {
             if (fLights) {
                 *fLights->fLights.push() = light;
             }
         }
 
         sk_sp<SkLights> finish() {
             return fLights;
         }
 
     private:
         sk_sp<SkLights> fLights;
     };
 
     int numLights() const {
         return fLights.count();
     }
 
     const Light& light(int index) const {
         return fLights[index];
     }
 
+    Light& editLight(int index) {

[jvanverth1, 2016/07/18 15:02:26]

You can just call this light() like the const version -- the compiler will
figure it out.

[vjiaoblack, 2016/07/18 16:51:06]

Done.

+        return fLights[index];
+    }
+
 private:
     SkLights() {}
 
     SkTDArray<Light> fLights;
 };
 
 #endif