Make SkGpuBlurUtils::GaussianBlur more drawContext centric

src/effects/SkBlurMaskFilter.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
 #include "SkGpuBlurUtils.h"
@@ skipping 1230 matching lines @@
     SkRect clipRect = SkRect::MakeWH(maskRect.width(), maskRect.height());
 
     GrContext* context = src->getContext();
 
     SkScalar xformedSigma = this->computeXformedSigma(ctm);
     SkASSERT(xformedSigma > 0);
 
     // If we're doing a normal blur, we can clobber the pathTexture in the
     // gaussianBlur.  Otherwise, we need to save it for later compositing.
     bool isNormalBlur = (kNormal_SkBlurStyle == fBlurStyle);
-    *result = SkGpuBlurUtils::GaussianBlur(context, src, isNormalBlur && canOverwriteSrc,
-                                           clipRect, nullptr,
-                                           xformedSigma, xformedSigma);
-    if (nullptr == *result) {
+    sk_sp<GrDrawContext> drawContext(SkGpuBlurUtils::GaussianBlur(context, src,
+                                                                  isNormalBlur && canOverwriteSrc,
+                                                                  clipRect, nullptr,
+                                                                  xformedSigma, xformedSigma));
+    if (!drawContext) {
         return false;
     }
 
     if (!isNormalBlur) {
         GrPaint paint;
         SkMatrix matrix;
         matrix.setIDiv(src->width(), src->height());
         // Blend pathTexture over blurTexture.
         paint.addCoverageFragmentProcessor(GrSimpleTextureEffect::Create(src, matrix))->unref();
         if (kInner_SkBlurStyle == fBlurStyle) {
             // inner:  dst = dst * src
             paint.setCoverageSetOpXPFactory(SkRegion::kIntersect_Op);
         } else if (kSolid_SkBlurStyle == fBlurStyle) {
             // solid:  dst = src + dst - src * dst
             //             = src + (1 - src) * dst
             paint.setCoverageSetOpXPFactory(SkRegion::kUnion_Op);
         } else if (kOuter_SkBlurStyle == fBlurStyle) {
             // outer:  dst = dst * (1 - src)
             //             = 0 * src + (1 - src) * dst
             paint.setCoverageSetOpXPFactory(SkRegion::kDifference_Op);
         } else {
             paint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op);
         }
 
-        sk_sp<GrDrawContext> drawContext(
-                                    context->drawContext(sk_ref_sp((*result)->asRenderTarget())));
-        if (!drawContext) {
-            return false;
-        }
-
         drawContext->drawRect(GrClip::WideOpen(), paint, SkMatrix::I(), clipRect);
     }
 
+    *result = drawContext->asTexture().release();
     return true;
 }
 
 #endif // SK_SUPPORT_GPU
 
 
 #ifndef SK_IGNORE_TO_STRING
 void SkBlurMaskFilterImpl::toString(SkString* str) const {
     str->append("SkBlurMaskFilterImpl: (");
 
@@ skipping 18 matching lines @@
     } else {
         str->append("None");
     }
     str->append("))");
 }
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END