turn off debugging printfs

src/pathops/SkPathOpsLine.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkPathOpsLine.h"
 
 SkDLine SkDLine::subDivide(double t1, double t2) const {
     SkDVector delta = tangent();
@@ skipping 23 matching lines @@
 //            =0 for P2 on the line
 //            <0 for P2 right of the line
 //    See: the January 2001 Algorithm on Area of Triangles
 //    return (float) ((P1.x - P0.x)*(P2.y - P0.y) - (P2.x - P0.x)*(P1.y - P0.y));
 double SkDLine::isLeft(const SkDPoint& pt) const {
     SkDVector p0 = fPts[1] - fPts[0];
     SkDVector p2 = pt - fPts[0];
     return p0.cross(p2);
 }
 
-// OPTIMIZE: assert if t is 0 or 1 (caller shouldn't pass only 0/1)
-SkDPoint SkDLine::xyAtT(double t) const {
+SkDPoint SkDLine::ptAtT(double t) const {
+    if (0 == t) {
+        return fPts[0];
+    }
+    if (1 == t) {
+        return fPts[1];
+    }
     double one_t = 1 - t;
     SkDPoint result = { one_t * fPts[0].fX + t * fPts[1].fX, one_t * fPts[0].fY + t * fPts[1].fY };
     return result;
 }
 
 double SkDLine::exactPoint(const SkDPoint& xy) const {
     if (xy == fPts[0]) {  // do cheapest test first
         return 0;
     }
     if (xy == fPts[1]) {
         return 1;
     }
     return -1;
 }
 
 double SkDLine::nearPoint(const SkDPoint& xy) const {
     if (!AlmostBetweenUlps(fPts[0].fX, xy.fX, fPts[1].fX)
             || !AlmostBetweenUlps(fPts[0].fY, xy.fY, fPts[1].fY)) {
         return -1;
     }
     // project a perpendicular ray from the point to the line; find the T on the line
     SkDVector len = fPts[1] - fPts[0]; // the x/y magnitudes of the line
     double denom = len.fX * len.fX + len.fY * len.fY;  // see DLine intersectRay
     SkDVector ab0 = xy - fPts[0];
     double numer = len.fX * ab0.fX + ab0.fY * len.fY;
     if (!between(0, numer, denom)) {
         return -1;
     }
     double t = numer / denom;
-    SkDPoint realPt = xyAtT(t);
+    SkDPoint realPt = ptAtT(t);
     SkDVector distU = xy - realPt;
     double distSq = distU.fX * distU.fX + distU.fY * distU.fY;
     double dist = sqrt(distSq); // OPTIMIZATION: can we compare against distSq instead ?
     // find the ordinal in the original line with the largest unsigned exponent
     double tiniest = SkTMin(SkTMin(SkTMin(fPts[0].fX, fPts[0].fY), fPts[1].fX), fPts[1].fY);
     double largest = SkTMax(SkTMax(SkTMax(fPts[0].fX, fPts[0].fY), fPts[1].fX), fPts[1].fY);
     largest = SkTMax(largest, -tiniest);
     if (!AlmostEqualUlps(largest, largest + dist)) { // is the dist within ULPS tolerance?
         return -1;
     }
@@ skipping 44 matching lines @@
         return -1;
     }
     if (!AlmostBetweenUlps(top, xy.fY, bottom)) {
         return -1;
     }
     double t = (xy.fY - top) / (bottom - top);
     t = SkPinT(t);
     SkASSERT(between(0, t, 1));
     return t;
 }