ubsan shift fixes

src/core/SkScan_AntiPath.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkScanPriv.h"
@@ skipping 527 matching lines @@
         return;
     }
 
 #ifdef SK_DEBUG
     {
         int ix = x >> SHIFT;
         SkASSERT(ix >= fMask.fBounds.fLeft && ix < fMask.fBounds.fRight);
     }
 #endif
 
-    x -= (fMask.fBounds.fLeft << SHIFT);
+    x -= SkLeftShift(fMask.fBounds.fLeft, SHIFT);
 
     // hack, until I figure out why my cubics (I think) go beyond the bounds
     if (x < 0) {
         width += x;
         x = 0;
     }
 
     uint8_t* row = fMask.fImage + iy * fMask.fRowBytes + (x >> SHIFT);
 
     int start = x;
@@ skipping 26 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 static bool fitsInsideLimit(const SkRect& r, SkScalar max) {
     const SkScalar min = -max;
     return  r.fLeft > min && r.fTop > min &&
             r.fRight < max && r.fBottom < max;
 }
 
 static int overflows_short_shift(int value, int shift) {
     const int s = 16 + shift;
-    return (value << s >> s) - value;
+    return (SkLeftShift(value, s) >> s) - value;
 }
 
 /**
   Would any of the coordinates of this rectangle not fit in a short,
   when left-shifted by shift?
 */
 static int rect_overflows_short_shift(SkIRect rect, int shift) {
     SkASSERT(!overflows_short_shift(8191, SHIFT));
     SkASSERT(overflows_short_shift(8192, SHIFT));
     SkASSERT(!overflows_short_shift(32767, 0));
@@ skipping 152 matching lines @@
         AntiFillPath(path, clip.bwRgn(), blitter);
     } else {
         SkRegion        tmp;
         SkAAClipBlitter aaBlitter;
 
         tmp.setRect(clip.getBounds());
         aaBlitter.init(blitter, &clip.aaRgn());
         SkScan::AntiFillPath(path, tmp, &aaBlitter, true);
     }
 }