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

src/effects/SkImageSource.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageSource.h"
 
 #include "SkCanvas.h"
@@ skipping 75 matching lines @@
     if (fSrcRect == bounds && dstRect == bounds) {
         // No regions cropped out or resized; return entire image.
         offset->fX = offset->fY = 0;
         return SkSpecialImage::MakeFromImage(SkIRect::MakeWH(fImage->width(), fImage->height()),
                                              fImage,
                                              &source->props());
     }
 
     const SkIRect dstIRect = dstRect.roundOut();
 
-    // SRGBTODO: Propagate SkColorType?
-    const SkImageInfo info = SkImageInfo::MakeN32(dstIRect.width(), dstIRect.height(),
-                                                  kPremul_SkAlphaType);
-
-    sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
+    sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), dstIRect.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 23 matching lines @@
 void SkImageSource::toString(SkString* str) const {
     str->appendf("SkImageSource: (");
     str->appendf("src: (%f,%f,%f,%f) dst: (%f,%f,%f,%f) ",
                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom,
                  fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
     str->appendf("image: (%d,%d)",
                  fImage->width(), fImage->height());
     str->append(")");
 }
 #endif