API change to allow for NormalSource selection at the user level.

samplecode/SampleLighting.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "DecodeFile.h"
 #include "SampleCode.h"
 #include "Resources.h"
 
+#include "SkBitmapProcShader.h"
 #include "SkCanvas.h"
 #include "SkLightingShader.h"
+#include "SkNormalSource.h"
 #include "SkPoint3.h"
 
 static sk_sp<SkLights> create_lights(SkScalar angle, SkScalar blue) {
 
     const SkVector3 dir = SkVector3::Make(SkScalarSin(angle)*SkScalarSin(SK_ScalarPI*0.25f),
                                           SkScalarCos(angle)*SkScalarSin(SK_ScalarPI*0.25f),
                                           SkScalarCos(SK_ScalarPI*0.25f));
 
     SkLights::Builder builder;
 
@@ skipping 34 matching lines @@
 
     void onDrawContent(SkCanvas* canvas) override {
         fLightAngle += 0.015f;
         fColorFactor += 0.01f;
         if (fColorFactor > 1.0f) {
             fColorFactor = 0.0f;
         }
 
         sk_sp<SkLights> lights(create_lights(fLightAngle, fColorFactor));
         SkPaint paint;
-        paint.setShader(SkLightingShader::Make(fDiffuseBitmap, fNormalBitmap,
-                                               std::move(lights), SkVector::Make(1.0f, 0.0f),
-                                               nullptr, nullptr));
+        sk_sp<SkShader> normalMap = SkMakeBitmapShader(fNormalBitmap,
+            SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, nullptr, nullptr);
+        sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(
+                std::move(normalMap), SkMatrix::I());
+        paint.setShader(SkLightingShader::Make(fDiffuseBitmap, std::move(lights), nullptr,
+                                               std::move(normalSource)));
         paint.setColor(SK_ColorBLACK);
 
         SkRect r = SkRect::MakeWH((SkScalar)fDiffuseBitmap.width(),
                                   (SkScalar)fDiffuseBitmap.height());
         canvas->drawRect(r, paint);
 
         // so we're constantly updating
         this->inval(nullptr);
     }
 
     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
         this->inval(nullptr);
         return this->INHERITED::onFindClickHandler(x, y, modi);
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new LightingView; }
 static SkViewRegister reg(MyFactory);