path ops work in progress

src/pathops/SkPathOpsBounds.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpBounds_DEFINED
 #define SkPathOpBounds_DEFINED
 
 #include "SkPathOpsRect.h"
 #include "SkRect.h"
 
 // SkPathOpsBounds, unlike SkRect, does not consider a line to be empty.
 struct SkPathOpsBounds : public SkRect {
     static bool Intersects(const SkPathOpsBounds& a, const SkPathOpsBounds& b) {
-        return a.fLeft <= b.fRight && b.fLeft <= a.fRight &&
-                a.fTop <= b.fBottom && b.fTop <= a.fBottom;
+        return AlmostLessOrEqualUlps(a.fLeft, b.fRight)
+                && AlmostLessOrEqualUlps(b.fLeft, a.fRight)
+                && AlmostLessOrEqualUlps(a.fTop, b.fBottom)
+                && AlmostLessOrEqualUlps(b.fTop, a.fBottom);
     }
 
    // Note that add(), unlike SkRect::join() or SkRect::growToInclude()
    // does not treat the bounds of horizontal and vertical lines as
    // empty rectangles.
     void add(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) {
         if (left < fLeft) fLeft = left;
         if (top < fTop) fTop = top;
         if (right > fRight) fRight = right;
         if (bottom > fBottom) fBottom = bottom;
     }
 
     void add(const SkPathOpsBounds& toAdd) {
         add(toAdd.fLeft, toAdd.fTop, toAdd.fRight, toAdd.fBottom);
     }
 
     void add(const SkPoint& pt) {
         if (pt.fX < fLeft) fLeft = pt.fX;
         if (pt.fY < fTop) fTop = pt.fY;
         if (pt.fX > fRight) fRight = pt.fX;
         if (pt.fY > fBottom) fBottom = pt.fY;
     }
 
+    bool almostContains(const SkPoint& pt) {
+        return AlmostLessOrEqualUlps(fLeft, pt.fX)
+                && AlmostLessOrEqualUlps(pt.fX, fRight)
+                && AlmostLessOrEqualUlps(fTop, pt.fY)
+                && AlmostLessOrEqualUlps(pt.fY, fBottom);
+    }
+
     // unlike isEmpty(), this permits lines, but not points
     // FIXME: unused for now
     bool isReallyEmpty() const {
         // use !<= instead of > to detect NaN values
         return !(fLeft <= fRight) || !(fTop <= fBottom)
                 || (fLeft == fRight && fTop == fBottom);
     }
 
     void setCubicBounds(const SkPoint a[4]);
     void setLineBounds(const SkPoint a[2]);
     void setQuadBounds(const SkPoint a[3]);
 
     void setPointBounds(const SkPoint& pt) {
         fLeft = fRight = pt.fX;
         fTop = fBottom = pt.fY;
     }
 
     typedef SkRect INHERITED;
 };
 
 extern void (SkPathOpsBounds::*SetCurveBounds[])(const SkPoint[]);
 
 #endif