Refactor drawContext/RenderTarget creation

src/effects/SkXfermodeImageFilter.cpp

Index: src/effects/SkXfermodeImageFilter.cpp
diff --git a/src/effects/SkXfermodeImageFilter.cpp b/src/effects/SkXfermodeImageFilter.cpp
index b1ac1c32e08ac9c20bc8eed444f350f3056080eb..b1e19bbec3e207e82db9617473baa8f8e02fde5a 100644
--- a/src/effects/SkXfermodeImageFilter.cpp
+++ b/src/effects/SkXfermodeImageFilter.cpp
@@ -176,16 +176,6 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
         foregroundTex = foreground->asTextureRef(context);
     }
 
-    GrSurfaceDesc desc;
-    desc.fFlags = kRenderTarget_GrSurfaceFlag;
-    desc.fWidth = bounds.width();
-    desc.fHeight = bounds.height();
-    desc.fConfig = kSkia8888_GrPixelConfig;
-    sk_sp<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
-    if (!dst) {
-        return nullptr;
-    }
-
     GrPaint paint;
     // SRGBTODO: AllowSRGBInputs?
     SkAutoTUnref<const GrFragmentProcessor> bgFP;
@@ -236,11 +226,11 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
             mode.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode));
         }
 
-        SkAutoTUnref<const GrFragmentProcessor> xferFP(mode->getFragmentProcessorForImageFilter(bgFP));
+        sk_sp<const GrFragmentProcessor> xferFP(mode->getFragmentProcessorForImageFilter(bgFP));
 
         // A null 'xferFP' here means kSrc_Mode was used in which case we can just proceed
         if (xferFP) {
-            paint.addColorFragmentProcessor(xferFP);
+            paint.addColorFragmentProcessor(xferFP.get());
         }
     } else {
         paint.addColorFragmentProcessor(bgFP);
@@ -248,7 +238,9 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
 
     paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
 
-    sk_sp<GrDrawContext> drawContext(context->drawContext(sk_ref_sp(dst->asRenderTarget())));
+    sk_sp<GrDrawContext> drawContext(context->newDrawContext(GrContext::kLoose_BackingFit,
+                                                             bounds.width(), bounds.height(),
+                                                             kSkia8888_GrPixelConfig));
     if (!drawContext) {
         return nullptr;
     }
@@ -259,7 +251,7 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
 
     return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(bounds.width(), bounds.height()),
                                        kNeedNewImageUniqueID_SpecialImage,
-                                       std::move(dst));
+                                       drawContext->asTexture());
 }
 
 #endif