Refactoring of GPU NormalMap handling out into its own class

tests/SerializationTest.cpp

Index: tests/SerializationTest.cpp
diff --git a/tests/SerializationTest.cpp b/tests/SerializationTest.cpp
index 9e9b221cd287800c74dd8c19cde24c1273092610..8acfcc202ed5a7da8f9ddfd6fed54a209d799de7 100644
--- a/tests/SerializationTest.cpp
+++ b/tests/SerializationTest.cpp
@@ -5,13 +5,14 @@
  * found in the LICENSE file.
  */
 
-#include "SkAnnotationKeys.h"
 #include "Resources.h"
+#include "SkAnnotationKeys.h"
 #include "SkCanvas.h"
 #include "SkFixed.h"
 #include "SkFontDescriptor.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
+#include "SkLightingShader.h"
 #include "SkMallocPixelRef.h"
 #include "SkOSFile.h"
 #include "SkPictureRecorder.h"
@@ -21,6 +22,7 @@
 #include "SkWriteBuffer.h"
 #include "SkValidatingReadBuffer.h"
 #include "SkXfermodeImageFilter.h"
+#include "sk_tool_utils.h"
 #include "Test.h"
 
 static const uint32_t kArraySize = 64;
@@ -182,8 +184,8 @@ static T* TestFlattenableSerialization(T* testObj, bool shouldSucceed,
     size_t bytesWritten = writer.bytesWritten();
     REPORTER_ASSERT(reporter, SkAlign4(bytesWritten) == bytesWritten);
 
-    unsigned char dataWritten[4096];
-    SkASSERT(bytesWritten <= sizeof(dataWritten));
+    // TODO Is this ok? or was the 4KB limit there for some technical reason?
+    unsigned char dataWritten[bytesWritten];
     writer.writeToMemory(dataWritten);
 
     // Make sure this fails when it should (test with smaller size, but still multiple of 4)
@@ -546,6 +548,43 @@ DEF_TEST(Serialization, reporter) {
     }
 
     TestPictureTypefaceSerialization(reporter);
+
+    // Test SkLightingShader/NormalMapSource serialization
+    {
+        const int kTexSize = 128;
+
+        SkLights::Builder builder;
+
+        builder.add(SkLights::Light(SkColor3f::Make(1.0f, 1.0f, 1.0f),
+                                    SkVector3::Make(1.0f, 0.0f, 0.0f)));
+        builder.add(SkLights::Light(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
+
+        sk_sp<SkLights> fLights = builder.finish();
+
+        SkBitmap diffuse = sk_tool_utils::create_checkerboard_bitmap(
+                kTexSize, kTexSize,
+                sk_tool_utils::color_to_565(0x0),
+                sk_tool_utils::color_to_565(0xFF804020),
+                8);
+
+        SkRect bitmapBounds = SkRect::MakeIWH(diffuse.width(), diffuse.height());
+
+        SkMatrix matrix;
+        SkRect r = SkRect::MakeWH(SkIntToScalar(kTexSize), SkIntToScalar(kTexSize));
+        matrix.setRectToRect(bitmapBounds, r, SkMatrix::kFill_ScaleToFit);
+
+        SkVector invNormRotation = { SkScalarSqrt(0.3), SkScalarSqrt(0.7) };
+        SkBitmap normals;
+        normals.allocN32Pixels(kTexSize, kTexSize);
+
+        sk_tool_utils::create_frustum_normal_map(&normals, SkIRect::MakeWH(kTexSize, kTexSize));
+        sk_sp<SkShader> lightingShader = SkLightingShader::Make(diffuse, normals, fLights,
+                invNormRotation, &matrix, &matrix);
+
+        TestFlattenableSerialization(lightingShader.get(), true, reporter);
+        // TODO test equality?
+
+    }
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////