Use enclosing int rect for picture shader tiles

src/core/SkPictureShader.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPictureShader.h"
 
 #include "SkBitmap.h"
@@ skipping 179 matching lines @@
     // Scale down the tile size if larger than maxTextureSize for GPU Path or it should fail on create texture
     if (maxTextureSize) {
         if (scaledSize.width() > maxTextureSize || scaledSize.height() > maxTextureSize) {
             SkScalar downScale = maxTextureSize / SkMaxScalar(scaledSize.width(), scaledSize.height());
             scaledSize.set(SkScalarFloorToScalar(SkScalarMul(scaledSize.width(), downScale)),
                            SkScalarFloorToScalar(SkScalarMul(scaledSize.height(), downScale)));
         }
     }
 #endif
 
-    SkISize tileSize = scaledSize.toRound();
+#ifdef SK_SUPPORT_LEGACY_PICTURESHADER_ROUNDING
+    const SkISize tileSize = scaledSize.toRound();
+#else
+    const SkISize tileSize = scaledSize.toCeil();
+#endif
     if (tileSize.isEmpty()) {
         return SkShader::CreateEmptyShader();
     }
 
     // The actual scale, compensating for rounding & clamping.
-    SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fTile.width(),
-                                    SkIntToScalar(tileSize.height()) / fTile.height());
+    const SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fTile.width(),
+                                          SkIntToScalar(tileSize.height()) / fTile.height());
 
     SkAutoTUnref<SkShader> tileShader;
     BitmapShaderKey key(fPicture->uniqueID(),
                         fTile,
                         fTmx,
                         fTmy,
                         tileScale,
                         this->getLocalMatrix());
 
     if (!SkResourceCache::Find(key, BitmapShaderRec::Visitor, &tileShader)) {
@@ skipping 103 matching lines @@
     if (context) {
         maxTextureSize = context->caps()->maxTextureSize();
     }
     SkAutoTUnref<SkShader> bitmapShader(this->refBitmapShader(viewM, localMatrix, maxTextureSize));
     if (!bitmapShader) {
         return nullptr;
     }
     return bitmapShader->asFragmentProcessor(context, viewM, nullptr, fq);
 }
 #endif