add JSONP option to output of skpdiff

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/18648002

git-svn-id: http://skia.googlecode.com/svn/trunk@9907 2bbb7eff-a529-9590-31e7-b0007b416f81

experimental/skpdiff/SkDiffContext.cpp

@@ -147,9 +147,15 @@ void SkDiffContext::diffPatterns(const char baselinePattern[], const char testPa
     }
 }
 
-void SkDiffContext::outputRecords(SkWStream& stream) {
+void SkDiffContext::outputRecords(SkWStream& stream, bool useJSONP) {
     DiffRecord* currentRecord = fRecords;
-    stream.writeText("{\n");
+    if (useJSONP) {
+        stream.writeText("var SkPDiffRecords = {\n");
+    }
+    else
+    {
+        stream.writeText("{\n");
+    }
     stream.writeText("    \"records\": [\n");
     while (NULL != currentRecord) {
         stream.writeText("        {\n");
@@ -214,5 +220,11 @@ void SkDiffContext::outputRecords(SkWStream& stream) {
         currentRecord = currentRecord->fNext;
     }
     stream.writeText("    ]\n");
-    stream.writeText("}\n");
+    if (useJSONP) {
+        stream.writeText("};\n");
+    }
+    else
+    {
+        stream.writeText("}\n");
+    }
 }

experimental/skpdiff/SkDiffContext.h

@@ -85,9 +85,10 @@ public:
      *     ]
      * }
      *
-     * @param stream The stream to output the diff to
+     * @param stream   The stream to output the diff to
+     * @param useJSONP True to adding padding to the JSON output to make it cross-site requestable.
      */
-    void outputRecords(SkWStream& stream);
+    void outputRecords(SkWStream& stream, bool useJSONP);
 
 private:
     struct DiffData {

experimental/skpdiff/main.cpp

@@ -29,6 +29,7 @@ DEFINE_string2(differs, d, "", "The names of the differs to use or all of them b
 DEFINE_string2(folders, f, "", "Compare two folders with identical subfile names: <baseline folder> <test folder>");
 DEFINE_string2(patterns, p, "", "Use two patterns to compare images: <baseline> <test>");
 DEFINE_string2(output, o, "skpdiff_output.json", "Writes the output of these diffs to output: <output>");
+DEFINE_bool(jsonp, true, "Output JSON with padding");
 
 /// A callback for any OpenCL errors
 CL_CALLBACK void error_notify(const char* errorInfo, const void* privateInfoSize, ::size_t cb, void* userData) {
@@ -181,7 +182,7 @@ int main(int argc, char** argv) {
     // Output to the file specified
     if (!FLAGS_output.isEmpty()) {
         SkFILEWStream outputStream(FLAGS_output[0]);
-        ctx.outputRecords(outputStream);
+        ctx.outputRecords(outputStream, FLAGS_jsonp);
     }
 
     return 0;