Add a way to monitor cache hits and misses for deferred decoding.

tools/bench_pictures_main.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "BenchTimer.h"
 #include "CopyTilesRenderer.h"
 #include "PictureBenchmark.h"
@@ skipping 26 matching lines @@
 DEFINE_string(logFile, "", "Destination for writing log output, in addition to stdout.");
 DEFINE_bool(logPerIter, false, "Log each repeat timer instead of mean.");
 DEFINE_bool(min, false, "Print the minimum times (instead of average).");
 DECLARE_int32(multi);
 DECLARE_string(r);
 DEFINE_int32(repeat, 1, "Set the number of times to repeat each test.");
 DEFINE_bool(timeIndividualTiles, false, "Report times for drawing individual tiles, rather than "
             "times for drawing the whole page. Requires tiled rendering.");
 DEFINE_string(timers, "", "[wcgWC]*: Display wall, cpu, gpu, truncated wall or truncated cpu time"
               " for each picture.");
+DEFINE_bool(trackDeferredCaching, false, "Only meaningful with --deferImageDecoding and "
+            "LAZY_CACHE_STATS set to true. Report percentage of cache hits when using deferred "
+            "image decoding.");
 
 static char const * const gFilterTypes[] = {
     "paint",
     "point",
     "line",
     "bitmap",
     "rect",
     "oval",
     "path",
     "text",
@@ skipping 76 matching lines @@
         }
         if (index < kFilterFlagsCount - 1) {
             result += " | ";
         }
     }
     return result;
 }
 
 #include "SkData.h"
 #include "SkLruImageCache.h"
+#include "SkLazyPixelRef.h"
 
 static SkLruImageCache gLruImageCache(1024*1024);
 
 static bool lazy_decode_bitmap(const void* buffer, size_t size, SkBitmap* bitmap) {
     void* copiedBuffer = sk_malloc_throw(size);
     memcpy(copiedBuffer, buffer, size);
     SkAutoDataUnref data(SkData::NewFromMalloc(copiedBuffer, size));
     SkBitmapFactory factory(&SkImageDecoder::DecodeMemoryToTarget);
     factory.setImageCache(&gLruImageCache);
     return factory.installPixelRef(data, bitmap);
 }
 
+#if LAZY_CACHE_STATS
+static int32_t gTotalCacheHits;
+static int32_t gTotalCacheMisses;
+#endif
+
 static bool run_single_benchmark(const SkString& inputPath,
                                  sk_tools::PictureBenchmark& benchmark) {
     SkFILEStream inputStream;
 
     inputStream.setPath(inputPath.c_str());
     if (!inputStream.isValid()) {
         SkString err;
         err.printf("Could not open file %s\n", inputPath.c_str());
         gLogger.logError(err);
         return false;
@@ skipping 17 matching lines @@
 
     SkString filename;
     sk_tools::get_basename(&filename, inputPath);
 
     SkString result;
     result.printf("running bench [%i %i] %s ", picture->width(), picture->height(),
                   filename.c_str());
     gLogger.logProgress(result);
 
     benchmark.run(picture);
+
+#if LAZY_CACHE_STATS
+    if (FLAGS_trackDeferredCaching) {
+        int32_t cacheHits = SkLazyPixelRef::GetCacheHits();
+        int32_t cacheMisses = SkLazyPixelRef::GetCacheMisses();
+        SkLazyPixelRef::ResetCacheStats();
+        SkDebugf("Cache hit rate: %f\n", (double) cacheHits / (cacheHits + cacheMisses));
+        gTotalCacheHits += cacheHits;
+        gTotalCacheMisses += cacheMisses;
+    }
+#endif
+
     return true;
 }
 
 static void setup_benchmark(sk_tools::PictureBenchmark* benchmark) {
     sk_tools::PictureRenderer::DrawFilterFlags drawFilters[SkDrawFilter::kTypeCount];
     sk_bzero(drawFilters, sizeof(drawFilters));
 
     if (FLAGS_filter.count() > 0) {
         const char* filters = FLAGS_filter[0];
         const char* colon = strchr(filters, ':');
         if (colon) {
-            int type = -1;
+            int32_t type = -1;
             size_t typeLen = colon - filters;
             for (size_t tIndex = 0; tIndex < kFilterTypesCount; ++tIndex) {
                 if (typeLen == strlen(gFilterTypes[tIndex])
                         && !strncmp(filters, gFilterTypes[tIndex], typeLen)) {
-                    type = tIndex;
+                    type = SkToS32(tIndex);
                     break;
                 }
             }
             if (type < 0) {
                 SkString err;
                 err.printf("Unknown type for --filter %s\n", filters);
                 gLogger.logError(err);
                 exit(-1);
             }
             int flag = -1;
@@ skipping 170 matching lines @@
     for (int i = 0; i < FLAGS_r.count(); ++i) {
         failures += process_input(FLAGS_r[i], benchmark);
     }
 
     if (failures != 0) {
         SkString err;
         err.printf("Failed to run %i benchmarks.\n", failures);
         gLogger.logError(err);
         return 1;
     }
+#if LAZY_CACHE_STATS
+    if (FLAGS_trackDeferredCaching) {
+        SkDebugf("Total cache hit rate: %f\n",
+                 (double) gTotalCacheHits / (gTotalCacheHits + gTotalCacheMisses));
+    }
+#endif
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif