put max on outputted poi in skpdiff

tools/skpdiff/SkDiffContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkImageDecoder.h"
 #include "SkOSFile.h"
 #include "SkStream.h"
 #include "SkTDict.h"
 
 #include "SkDiffContext.h"
 #include "SkImageDiffer.h"
 #include "skpdiff_util.h"
 
+// Truncates the number of points of interests in JSON output to not freeze the parser
+static const int kMaxPOI = 100;
+
 SkDiffContext::SkDiffContext() {
     fRecords = NULL;
     fDiffers = NULL;
     fDifferCount = 0;
 }
 
 SkDiffContext::~SkDiffContext() {
     // Delete the record linked list
     DiffRecord* currentRecord = fRecords;
     while (NULL != currentRecord) {
@@ skipping 150 matching lines @@
 
                     stream.writeText("                    \"differName\": \"");
                     stream.writeText(data.fDiffName);
                     stream.writeText("\",\n");
 
                     stream.writeText("                    \"result\": ");
                     stream.writeScalarAsText((SkScalar)data.fResult);
                     stream.writeText(",\n");
 
                     stream.writeText("                    \"pointsOfInterest\": [\n");
-                    for (int poiIndex = 0; poiIndex < data.fPointsOfInterest.count(); poiIndex++) {
+                    for (int poiIndex = 0; poiIndex < data.fPointsOfInterest.count() &&
+                                           poiIndex < kMaxPOI; poiIndex++) {
                         SkIPoint poi = data.fPointsOfInterest[poiIndex];
                         stream.writeText("                        [");
                         stream.writeDecAsText(poi.x());
                         stream.writeText(",");
                         stream.writeDecAsText(poi.y());
                         stream.writeText("]");
 
                         // JSON does not allow trailing commas
                         if (poiIndex + 1 < data.fPointsOfInterest.count())
                         {
@@ skipping 84 matching lines @@
         for (int i = 0; i < cntColumns; i++) {
             SkString str;
             str.printf(", %f", values[i]);
             stream.writeText(str.c_str());
         }
         stream.writeText("\n");
 
         currentRecord = currentRecord->fNext;
     }
 }