SkPictureShader: floor scaledSize not to exceed maxTextureSize

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 160 matching lines @@
         SkScalar clampScale = SkScalarSqrt(SkScalarDiv(kMaxTileArea, tileArea));
         scaledSize.set(SkScalarMul(scaledSize.width(), clampScale),
                        SkScalarMul(scaledSize.height(), clampScale));
     }
 #if SK_SUPPORT_GPU
     // 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 = SkScalarDiv(maxTextureSize,
                                             SkMax32(scaledSize.width(), scaledSize.height()));
-            scaledSize.set(SkScalarMul(scaledSize.width(), downScale),
-                           SkScalarMul(scaledSize.height(), downScale));
+            scaledSize.set(SkScalarFloorToScalar(SkScalarMul(scaledSize.width(), downScale)),
+                           SkScalarFloorToScalar(SkScalarMul(scaledSize.height(), downScale)));
         }
     }
 #endif
 
     SkISize tileSize = scaledSize.toRound();
     if (tileSize.isEmpty()) {
         return NULL;
     }
 
     // The actual scale, compensating for rounding & clamping.
@@ skipping 129 matching lines @@
     return bitmapShader->asFragmentProcessor(context, paint, viewM, NULL, paintColor, fp);
 }
 #else
 bool SkPictureShader::asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&,
                                           const SkMatrix*, GrColor*,
                                           GrFragmentProcessor**) const {
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 }
 #endif