Fix floating point data loss in SkPictureShader

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 172 matching lines @@
     SkScalar tileArea = SkScalarMul(scaledSize.width(), scaledSize.height());
     if (tileArea > kMaxTileArea) {
         SkScalar clampScale = SkScalarSqrt(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 = maxTextureSize / SkMax32(scaledSize.width(), scaledSize.height());
+            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();
     if (tileSize.isEmpty()) {
         return SkShader::CreateEmptyShader();
     }
@@ skipping 119 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