Add --uninterestingHashesFile to DM

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 256014e5daabc979a0339b36086a230744700216..b5bf97934d87357de5089521ef1206d7b62a703b 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -17,8 +17,10 @@
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkInstCnt.h"
+#include "SkJSONCPP.h"
 #include "SkMD5.h"
 #include "SkOSFile.h"
+#include "SkTDict.h"
 #include "SkTHash.h"
 #include "SkTaskGroup.h"
 #include "SkThreadUtils.h"
@@ -42,6 +44,10 @@ DEFINE_string(blacklist, "",
 
 DEFINE_string2(readPath, r, "", "If set check for equality with golden results in this directory.");
 
+DEFINE_string(uninterestingHashesFile, "",
+        "JSON file containing a list of uninteresting hashes. If a result hashes to something in "
+        "this list, no image is written for that result.");
+
 __SK_FORCE_IMAGE_DECODER_LINKING;
 using namespace DM;
 
@@ -137,6 +143,32 @@ static void gather_gold() {
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
+static SkTDict<bool> gUninterestingHashes(0);

[mtklein, 2015/04/03 19:58:04]

Let's try:
  static SkTHashSet<SkString> gUninterestingHashes;

The loop would be

  for (const SkString& hash : lines) {
     gUninterestingHashes.add(hash);
  }

and the check:
  && !gUninterestingHashes.contains(md5) { 

[borenet, 2015/04/03 20:26:50]

Done.

+
+static void gather_uninteresting_hashes() {
+    if (!FLAGS_uninterestingHashesFile.isEmpty()) {
+        SkString path(FLAGS_uninterestingHashesFile[0]);
+        SkAutoTUnref<SkData> json(SkData::NewFromFileName(path.c_str()));
+        if (!json) {
+            fail(SkStringPrintf("Couldn't read %s to get the list of uninteresting hashes.",
+                                path.c_str()));
+        }
+
+        Json::Reader reader;
+        Json::Value root;
+        const char* data = (const char*)json->data();
+        if (!reader.parse(data, data+json->size(), root)) {
+            fail(SkStringPrintf("Couldn't parse JSON from %s.", path.c_str()));
+        }
+
+        for (unsigned i = 0; i < root.size(); i++) {
+            gUninterestingHashes.set(root[i].asCString(), true);
+        }
+    }
+}
+
+/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
+
 template <typename T>
 struct Tagged : public SkAutoTDelete<T> {
   const char* tag;
@@ -435,7 +467,7 @@ struct Task {
                                     FLAGS_readPath[0]));
             }
 
-            if (!FLAGS_writePath.isEmpty()) {
+            if (!FLAGS_writePath.isEmpty() && !gUninterestingHashes.find(md5.c_str(), md5.size())) {
                 const char* ext = task->sink->fileExtension();
                 if (data->getLength()) {
                     WriteToDisk(*task, md5, ext, data, data->getLength(), NULL);
@@ -625,6 +657,7 @@ int dm_main() {
     start_keepalive();
 
     gather_gold();
+    gather_uninteresting_hashes();
 
     gather_srcs();
     gather_sinks();