allow pictures to have a full bounds

src/core/SkBBHFactory.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 "SkBBHFactory.h"
 #include "SkRTree.h"
 #include "SkTileGrid.h"
 
-
-SkBBoxHierarchy* SkRTreeFactory::operator()(int width, int height) const {
-    SkScalar aspectRatio = SkScalarDiv(SkIntToScalar(width), SkIntToScalar(height));
+SkBBoxHierarchy* SkRTreeFactory::operator()(const SkRect& bounds) const {
+    SkScalar aspectRatio = bounds.width() / bounds.height();
     return SkNEW_ARGS(SkRTree, (aspectRatio));
 }
 
-SkBBoxHierarchy* SkTileGridFactory::operator()(int width, int height) const {
+SkBBoxHierarchy* SkTileGridFactory::operator()(const SkRect& bounds) const {
     SkASSERT(fInfo.fMargin.width() >= 0);
     SkASSERT(fInfo.fMargin.height() >= 0);
+
+    // We want a conservative answer for the size...
+    const SkIRect ibounds = bounds.roundOut();
+    const int width = ibounds.width();
+    const int height = ibounds.height();
+
     // Note: SkIRects are non-inclusive of the right() column and bottom() row.
     // For example, an SkIRect at 0,0 with a size of (1,1) will only have
     // content at pixel (0,0) and will report left=0 and right=1, hence the
     // "-1"s below.
     int xTileCount = (width + fInfo.fTileInterval.width() - 1) / fInfo.fTileInterval.width();
     int yTileCount = (height + fInfo.fTileInterval.height() - 1) / fInfo.fTileInterval.height();
     return SkNEW_ARGS(SkTileGrid, (xTileCount, yTileCount, fInfo));
 }