Create special surfaces according to original device (not always in N32)

src/effects/SkOffsetImageFilter.cpp

 /*
  * Copyright 2012 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 "SkOffsetImageFilter.h"
 
 #include "SkCanvas.h"
@@ skipping 31 matching lines @@
         offset->fY = srcOffset.fY + SkScalarRoundToInt(vec.fY);
         return input;
     } else {
         SkIRect bounds;
         SkIRect srcBounds = SkIRect::MakeWH(input->width(), input->height());
         srcBounds.offset(srcOffset);
         if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
             return nullptr;
         }
 
-        SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
-                                                kPremul_SkAlphaType);
-        sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
+        sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
         if (!surf) {
             return nullptr;
         }
 
         SkCanvas* canvas = surf->getCanvas();
         SkASSERT(canvas);
 
         // TODO: it seems like this clear shouldn't be necessary (see skbug.com/5075)
         canvas->clear(0x0);
 
@@ skipping 50 matching lines @@
 void SkOffsetImageFilter::toString(SkString* str) const {
     str->appendf("SkOffsetImageFilter: (");
     str->appendf("offset: (%f, %f) ", fOffset.fX, fOffset.fY);
     str->append("input: (");
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
     str->append("))");
 }
 #endif