Add no-op NULL picture to bench_record.

tools/bench_record.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommandLineFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
 #include "SkPicture.h"
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTime.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 // Just reading all the SKPs takes about 2 seconds for me, which is the same as about 100 loops of
 // rerecording all the SKPs.  So we default to --loops=900, which makes ~90% of our time spent in
 // recording, and this should take ~20 seconds to run.
 
 DEFINE_string2(skps, r, "skps", "Directory containing SKPs to read and re-record.");
 DEFINE_int32(loops, 900, "Number of times to re-record each SKP.");
 DEFINE_int32(flags, SkPicture::kUsePathBoundsForClip_RecordingFlag, "RecordingFlags to use.");
 DEFINE_bool(endRecording, true, "If false, don't time SkPicture::endRecording()");
+DEFINE_int32(nullSize, 1000, "Pretend dimension of null source picture.");
+
+static void bench_record(SkPicture* src, const char* name) {
+    const SkMSec start = SkTime::GetMSecs();
+    const int width  = src ? src->width()  : FLAGS_nullSize;
+    const int height = src ? src->height() : FLAGS_nullSize;
+
+    for (int i = 0; i < FLAGS_loops; i++) {
+        SkPicture dst;
+        SkCanvas* canvas = dst.beginRecording(width, height, FLAGS_flags);
+        if (src) src->draw(canvas);
+        if (FLAGS_endRecording) dst.endRecording();
+    }
+
+    const SkMSec elapsed = SkTime::GetMSecs() - start;
+    const double msPerLoop = elapsed / (double)FLAGS_loops;
+    printf("%.2g\t%s\n", msPerLoop, name);
+}
 
 int tool_main(int argc, char** argv);
 int tool_main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     SkAutoGraphics autoGraphics;
 
+    bench_record(NULL, "NULL");
+    if (FLAGS_skps.isEmpty()) return 0;
+
     SkOSFile::Iter it(FLAGS_skps[0], ".skp");
     SkString filename;
+    bool failed = false;
     while (it.next(&filename)) {
         const SkString path = SkOSPath::SkPathJoin(FLAGS_skps[0], filename.c_str());
 
         SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path.c_str()));
         if (!stream) {
             SkDebugf("Could not read %s.\n", path.c_str());
+            failed = true;
             continue;
         }
         SkAutoTUnref<SkPicture> src(SkPicture::CreateFromStream(stream));
         if (!src) {
             SkDebugf("Could not read %s as an SkPicture.\n", path.c_str());
+            failed = true;
             continue;
         }
-
-        const SkMSec start = SkTime::GetMSecs();
-        for (int i = 0; i < FLAGS_loops; i++) {
-            SkPicture dst;
-            src->draw(dst.beginRecording(src->width(), src->height(), FLAGS_flags));
-            if (FLAGS_endRecording) dst.endRecording();
-        }
-
-        const SkMSec elapsed = SkTime::GetMSecs() - start;
-        const double msPerLoop = elapsed / (double)FLAGS_loops;
-        printf("%4.2f\t%s\n", msPerLoop, filename.c_str());
+        bench_record(src, filename.c_str());
     }
-
-    return 0;
+    return failed ? 1 : 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif