handle halfway case in scan converter

include/core/SkRect.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkRect_DEFINED
 #define SkRect_DEFINED
 
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      *  Set the dst rectangle by rounding this rectangle's coordinates to their
      *  nearest integer values using SkScalarRoundToInt.
      */
     void round(SkIRect* dst) const {
         SkASSERT(dst);
         dst->set(SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
                  SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom));
     }
 
     /**
-     *  Variant of round() that explicitly performs the rounding step (i.e. floor(x + 0.5)) using
-     *  double instead of SkScalar (float). It does this by calling SkDScalarRoundToInt(), which
-     *  may be slower than calling SkScalarRountToInt(), but gives slightly more accurate results.
-     *
-     *  e.g.
-     *      SkScalar x = 0.49999997f;
-     *      int ix = SkScalarRoundToInt(x);
-     *      SkASSERT(0 == ix);  // <--- fails
-     *      ix = SkDScalarRoundToInt(x);
-     *      SkASSERT(0 == ix);  // <--- succeeds
-     */
-    void dround(SkIRect* dst) const {
-        SkASSERT(dst);
-        dst->set(SkDScalarRoundToInt(fLeft), SkDScalarRoundToInt(fTop),
-                 SkDScalarRoundToInt(fRight), SkDScalarRoundToInt(fBottom));
-    }
-
-    /**
      *  Set the dst rectangle by rounding "out" this rectangle, choosing the
      *  SkScalarFloor of top and left, and the SkScalarCeil of right and bottom.
      */
     void roundOut(SkIRect* dst) const {
         SkASSERT(dst);
         dst->set(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
                  SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom));
     }
 
     /**
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     void dumpHex() const { this->dump(true); }
 };
 
 inline bool SkIRect::contains(const SkRect& r) const {
     return  !r.isEmpty() && !this->isEmpty() &&     // check for empties
             (SkScalar)fLeft <= r.fLeft && (SkScalar)fTop <= r.fTop &&
             (SkScalar)fRight >= r.fRight && (SkScalar)fBottom >= r.fBottom;
 }
 
 #endif