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

src/effects/SkTileImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTileImageFilter.h"
 
 #include "SkCanvas.h"
@@ skipping 37 matching lines @@
         return nullptr;
     }
 
     SkRect dstRect;
     ctx.ctm().mapRect(&dstRect, fDstRect);
     if (!dstRect.intersect(SkRect::Make(ctx.clipBounds()))) {
         return nullptr;
     }
 
     const SkIRect dstIRect = dstRect.roundOut();
-    int dstWidth = dstIRect.width();
-    int dstHeight = dstIRect.height();
-    if (!fSrcRect.width() || !fSrcRect.height() || !dstWidth || !dstHeight) {
+    if (!fSrcRect.width() || !fSrcRect.height() || !dstIRect.width() || !dstIRect.height()) {
         return nullptr;
     }
 
     SkRect srcRect;
     ctx.ctm().mapRect(&srcRect, fSrcRect);
     SkIRect srcIRect;
     srcRect.roundOut(&srcIRect);
     srcIRect.offset(-inputOffset);
     const SkIRect inputBounds = SkIRect::MakeWH(input->width(), input->height());
 
@@ skipping 24 matching lines @@
 
         input->draw(canvas, 
                     SkIntToScalar(inputOffset.x()), SkIntToScalar(inputOffset.y()),
                     &paint);
 
         subset = surf->makeImageSnapshot();
     }
     SkASSERT(subset->width() == srcIRect.width());
     SkASSERT(subset->height() == srcIRect.height());
 
-    const SkImageInfo info = SkImageInfo::MakeN32(dstWidth, dstHeight, kPremul_SkAlphaType);
-
-    sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
+    sk_sp<SkSpecialSurface> surf(source->makeSurface(dstIRect));
     if (!surf) {
         return nullptr;
     }
 
     SkCanvas* canvas = surf->getCanvas();
     SkASSERT(canvas);
 
     SkPaint paint;
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     paint.setShader(subset->makeShader(SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
@@ skipping 42 matching lines @@
     str->appendf(" dst: %.2f %.2f %.2f %.2f",
                  fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
     if (this->getInput(0)) {
         str->appendf("input: (");
         this->getInput(0)->toString(str);
         str->appendf(")");
     }
     str->append(")");
 }
 #endif