guard rasterizer and drawlooper setters

tests/PaintTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkLayerDrawLooper.h"
@@ skipping 128 matching lines @@
 }
 
 DEF_TEST(Paint_copy, reporter) {
     SkPaint paint;
     // set a few member variables
     paint.setStyle(SkPaint::kStrokeAndFill_Style);
     paint.setTextAlign(SkPaint::kLeft_Align);
     paint.setStrokeWidth(SkIntToScalar(2));
     // set a few pointers
     SkLayerDrawLooper::Builder looperBuilder;
-    SkLayerDrawLooper* looper = looperBuilder.detachLooper();
-    paint.setLooper(looper)->unref();
+    paint.setLooper(looperBuilder.detach());
     SkMaskFilter* mask = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
                                       SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)));
     paint.setMaskFilter(mask)->unref();
 
     // copy the paint using the copy constructor and check they are the same
     SkPaint copiedPaint = paint;
     REPORTER_ASSERT(reporter, paint == copiedPaint);
 
     // copy the paint using the equal operator and check they are the same
     copiedPaint = paint;
@@ skipping 201 matching lines @@
     SkColorMatrix cm;
     cm.setIdentity();   // does not change alpha
     paint.setColorFilter(SkColorMatrixFilter::Create(cm))->unref();
     REPORTER_ASSERT(r, paint.nothingToDraw());
 
     cm.postTranslate(0, 0, 0, 1);    // wacks alpha
     paint.setColorFilter(SkColorMatrixFilter::Create(cm))->unref();
     REPORTER_ASSERT(r, !paint.nothingToDraw());
 }