Serialize invNormRotation in SkLightingShader.

src/core/SkLightingShader.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 "SkBitmapProcState.h"
 #include "SkColor.h"
 #include "SkEmptyShader.h"
@@ skipping 588 matching lines @@
             SkVector3 dir;
             if (!buf.readScalarArray(&dir.fX, 3)) {
                 return nullptr;
             }
             builder.add(SkLight(color, dir));
         }
     }
 
     SkAutoTUnref<const SkLightingShader::Lights> lights(builder.finish());
 
-    return sk_make_sp<SkLightingShaderImpl>(diffuse, normal, lights, SkVector::Make(1.0f, 0.0f),
+    SkVector invNormRotation = {1,0};
+    if (!buf.isVersionLT(SkReadBuffer::kLightingShaderWritesInvNormRotation)) {
+        invNormRotation = buf.readPoint();
+    }
+
+    return sk_make_sp<SkLightingShaderImpl>(diffuse, normal, lights, invNormRotation,
                                             &diffLocalM, &normLocalM);
 }
 
 void SkLightingShaderImpl::flatten(SkWriteBuffer& buf) const {
     this->INHERITED::flatten(buf);
 
     bool hasNormLocalM = !fNormLocalMatrix.isIdentity();
     buf.writeBool(hasNormLocalM);
     if (hasNormLocalM) {
         buf.writeMatrix(fNormLocalMatrix);
     }
 
     buf.writeBitmap(fDiffuseMap);
     buf.writeBitmap(fNormalMap);
 
     buf.writeInt(fLights->numLights());
     for (int l = 0; l < fLights->numLights(); ++l) {
         const SkLight& light = fLights->light(l);
 
         bool isAmbient = SkLight::kAmbient_LightType == light.type();
 
         buf.writeBool(isAmbient);
         buf.writeScalarArray(&light.color().fX, 3);
         if (!isAmbient) {
             buf.writeScalarArray(&light.dir().fX, 3);
         }
     }
+    buf.writePoint(fInvNormRotation);
 }
 
 bool SkLightingShaderImpl::computeNormTotalInverse(const ContextRec& rec,
                                                    SkMatrix* normTotalInverse) const {
     SkMatrix total;
     total.setConcat(*rec.fMatrix, fNormLocalMatrix);
 
     const SkMatrix* m = &total;
     if (rec.fLocalMatrix) {
         total.setConcat(*m, *rec.fLocalMatrix);
@@ skipping 69 matching lines @@
                                             normLocalM);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingShader)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkLightingShaderImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
 
 ///////////////////////////////////////////////////////////////////////////////