ubsan shift fixes

src/core/SkScan_Antihair.cpp

 
 /*
  * Copyright 2011 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.
  */
 
 
 #include "SkScan.h"
@@ skipping 232 matching lines @@
             uint8_t a = (uint8_t)(fx >> 8);
             this->getBlitter()->blitAntiH2(x - 1, y, 255 - a, a);
             fx += dx;
         } while (++y < stopy);
 
         return fx - SK_Fixed1/2;
     }
 };
 
 static inline SkFixed fastfixdiv(SkFDot6 a, SkFDot6 b) {
-    SkASSERT((a << 16 >> 16) == a);
+    SkASSERT((SkLeftShift(a, 16) >> 16) == a);
     SkASSERT(b != 0);
-    return (a << 16) / b;
+    return SkLeftShift(a, 16) / b;
 }
 
 #define SkBITCOUNT(x)   (sizeof(x) << 3)
 
 #if 1
 // returns high-bit set iff x==0x8000...
 static inline int bad_int(int x) {
     return x & -x;
 }
 
@@ skipping 732 matching lines @@
 
 void SkScan::AntiFrameRect(const SkRect& r, const SkPoint& strokeSize,
                            const SkRasterClip& clip, SkBlitter* blitter) {
     if (clip.isBW()) {
         AntiFrameRect(r, strokeSize, &clip.bwRgn(), blitter);
     } else {
         SkAAClipBlitterWrapper wrap(clip, blitter);
         AntiFrameRect(r, strokeSize, &wrap.getRgn(), wrap.getBlitter());
     }
 }