Catch invalid images in get_images_from_skps

tools/get_images_from_skps.cpp

Index: tools/get_images_from_skps.cpp
diff --git a/tools/get_images_from_skps.cpp b/tools/get_images_from_skps.cpp
index e6bb6e2012190698ebda8359826f7d36be275861..fecce4e067df8c5969473325cbfe89125aabd456 100644
--- a/tools/get_images_from_skps.cpp
+++ b/tools/get_images_from_skps.cpp
@@ -17,6 +17,7 @@
 
 DEFINE_string2(skps, s, "skps", "A path to a directory of skps.");
 DEFINE_string2(out, o, "img-out", "A path to an output directory.");
+DEFINE_bool(test, false, "Indicates if we want to test that the images decode successfully.");
 
 static int gKnown;
 static int gUnknown;
@@ -56,6 +57,17 @@ struct Sniffer : public SkPixelSerializer {
             default: gUnknown++; return;
         }
 
+        if (FLAGS_test) {
+            SkBitmap bitmap;
+            SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
+            bitmap.allocPixels(info);
+            if (SkCodec::kSuccess != codec->getPixels(info, bitmap.getPixels(), bitmap.rowBytes()))
+            {
+                gUnknown++;
+                return;
+            }
+        }
+
         SkString path;
         path.appendf("%s/%d.%s", gOutputDir, gKnown++, ext.c_str());