Adding new benchmark to test image decoding performance.

bench/nanobench.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 <ctype.h>
 
 #include "Benchmark.h"
 #include "CrashHandler.h"
+#include "DecodingBench.h"
+#include "DecodingSubsetBench.h"
 #include "GMBench.h"
 #include "ProcStats.h"
 #include "ResultsWriter.h"
 #include "RecordingBench.h"
 #include "SKPBench.h"
 #include "Stats.h"
 #include "Timer.h"
 
 #include "SkBBoxHierarchy.h"
 #include "SkCanvas.h"
 #include "SkCommonFlags.h"
+#include "SkData.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
 #include "SkPictureRecorder.h"
 #include "SkPictureUtils.h"
 #include "SkString.h"
 #include "SkSurface.h"
 #include "SkTaskGroup.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 399 matching lines @@
 }
 #endif
 
 class BenchmarkStream {
 public:
     BenchmarkStream() : fBenches(BenchRegistry::Head())
                       , fGMs(skiagm::GMRegistry::Head())
                       , fCurrentRecording(0)
                       , fCurrentScale(0)
                       , fCurrentSKP(0)
-                      , fCurrentUseMPD(0) {
+                      , fCurrentUseMPD(0)
+                      , fCurrentImage(0)
+                      , fCurrentSubsetImage(0)
+                      , fCurrentColorType(0)
+                      , fDivisor(2) {
         for (int i = 0; i < FLAGS_skps.count(); i++) {
             if (SkStrEndsWith(FLAGS_skps[i], ".skp")) {
                 fSKPs.push_back() = FLAGS_skps[i];
             } else {
                 SkOSFile::Iter it(FLAGS_skps[i], ".skp");
                 SkString path;
                 while (it.next(&path)) {
                     fSKPs.push_back() = SkOSPath::Join(FLAGS_skps[0], path.c_str());
                 }
             }
         }
 
         if (4 != sscanf(FLAGS_clip[0], "%d,%d,%d,%d",
                         &fClip.fLeft, &fClip.fTop, &fClip.fRight, &fClip.fBottom)) {
             SkDebugf("Can't parse %s from --clip as an SkIRect.\n", FLAGS_clip[0]);
             exit(1);
         }
 
         for (int i = 0; i < FLAGS_scales.count(); i++) {
             if (1 != sscanf(FLAGS_scales[i], "%f", &fScales.push_back())) {
                 SkDebugf("Can't parse %s from --scales as an SkScalar.\n", FLAGS_scales[i]);
                 exit(1);
             }
         }
 
         fUseMPDs.push_back() = false;
         if (FLAGS_mpd) {
             fUseMPDs.push_back() = true;
         }
+        
+        // Prepare the images for decoding
+        for (int i = 0; i < FLAGS_images.count(); i++) {
+            const char* flag = FLAGS_images[i];
+            if (sk_isdir(flag)) {
+                // If the value passed in is a directory, add all the images
+                SkOSFile::Iter it(flag);
+                SkString file;
+                while (it.next(&file)) {
+                    fImages.push_back() = SkOSPath::Join(flag, file.c_str());
+                }
+            } else if (sk_exists(flag)) {
+                // Also add the value if it is a single image
+                fImages.push_back() = flag;
+            }
+        }
+        
+        // Choose the candidate color types for image decoding
+        const SkColorType colorTypes[] =
+            { kN32_SkColorType, kRGB_565_SkColorType, kAlpha_8_SkColorType };
+        fColorTypes.push_back_n(SK_ARRAY_COUNT(colorTypes), colorTypes);
     }
 
     static bool ReadPicture(const char* path, SkAutoTUnref<SkPicture>* pic) {
         // Not strictly necessary, as it will be checked again later,
         // but helps to avoid a lot of pointless work if we're going to skip it.
         if (SkCommandLineFlags::ShouldSkip(FLAGS_match, path)) {
             return false;
         }
 
         SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(path));
@@ skipping 73 matching lines @@
                             (name.c_str(), pic.get(), fClip,
                              fScales[fCurrentScale], fUseMPDs[fCurrentUseMPD++]));
                 }
                 fCurrentUseMPD = 0;
                 fCurrentSKP++;
             }
             fCurrentSKP = 0;
             fCurrentScale++;
         }
 
+        // Run the DecodingBenches
+        while (fCurrentImage < fImages.count()) {
+            while (fCurrentColorType < fColorTypes.count()) {
+                const SkString& path = fImages[fCurrentImage];
+                SkColorType colorType = fColorTypes[fCurrentColorType];
+                fCurrentColorType++;
+                // Check if the image decodes before creating the benchmark
+                SkBitmap bitmap;
+                if (SkImageDecoder::DecodeFile(path.c_str(), &bitmap,
+                        colorType, SkImageDecoder::kDecodePixels_Mode)) {
+                    return new DecodingBench(path, colorType);
+                }
+            }
+            fCurrentColorType = 0;
+            fCurrentImage++;
+        }
+
+        // Run the DecodingSubsetBenches
+        while (fCurrentSubsetImage < fImages.count()) {
+            while (fCurrentColorType < fColorTypes.count()) {
+                const SkString& path = fImages[fCurrentSubsetImage];
+                SkColorType colorType = fColorTypes[fCurrentColorType];
+                fCurrentColorType++;
+                // Check if the image decodes before creating the benchmark
+                SkAutoTUnref<SkData> encoded(
+                        SkData::NewFromFileName(path.c_str()));
+                SkAutoTDelete<SkMemoryStream> stream(
+                        new SkMemoryStream(encoded));
+                SkAutoTDelete<SkImageDecoder>
+                    decoder(SkImageDecoder::Factory(stream.get()));
+                if (!decoder) {
+                    SkDebugf("Cannot find decoder for %s\n", path.c_str());
+                } else {
+                    stream->rewind();
+                    int w, h;
+                    bool success;
+                    if (!decoder->buildTileIndex(stream.detach(), &w, &h)
+                            || w*h == 1) {
+                        // This is not an error, but in this case we still
+                        // do not want to run the benchmark.
+                        success = false;
+                    } else if (fDivisor > w || fDivisor > h) {
+                        SkDebugf("Divisor %d is too big for %s %dx%d\n",
+                                fDivisor, path.c_str(), w, h);
+                        success = false;
+                    } else {
+                        const int sW  = w / fDivisor;
+                        const int sH = h / fDivisor;
+                        SkBitmap bitmap;
+                        success = true;
+                        for (int y = 0; y < h; y += sH) {
+                            for (int x = 0; x < w; x += sW) {
+                                SkIRect rect = SkIRect::MakeXYWH(x, y, sW, sH);
+                                success &= decoder->decodeSubset(&bitmap, rect,
+                                                                 colorType);
+                            }
+                        }
+                    }
+                    // Create the benchmark if successful
+                    if (success) {
+                        return new DecodingSubsetBench(path, colorType,
+                                                       fDivisor);
+                    }
+                }
+            }
+            fCurrentColorType = 0;
+            fCurrentSubsetImage++;
+        }
+
         return NULL;
     }
 
     void fillCurrentOptions(ResultsWriter* log) const {
         log->configOption("source_type", fSourceType);
         log->configOption("bench_type",  fBenchType);
         if (0 == strcmp(fSourceType, "skp")) {
             log->configOption("clip",
                     SkStringPrintf("%d %d %d %d", fClip.fLeft, fClip.fTop,
                                                   fClip.fRight, fClip.fBottom).c_str());
             log->configOption("scale", SkStringPrintf("%.2g", fScales[fCurrentScale]).c_str());
             if (fCurrentUseMPD > 0) {
                 SkASSERT(1 == fCurrentUseMPD || 2 == fCurrentUseMPD);
                 log->configOption("multi_picture_draw", fUseMPDs[fCurrentUseMPD-1] ? "true" : "false");
             }
         }
         if (0 == strcmp(fBenchType, "recording")) {
             log->metric("bytes", fSKPBytes);
             log->metric("ops",   fSKPOps);
         }
     }
 
 private:
     const BenchRegistry* fBenches;
     const skiagm::GMRegistry* fGMs;
     SkIRect            fClip;
     SkTArray<SkScalar> fScales;
     SkTArray<SkString> fSKPs;
     SkTArray<bool>     fUseMPDs;
+    SkTArray<SkString> fImages;
+    SkTArray<SkColorType> fColorTypes;
 
     double fSKPBytes, fSKPOps;
 
     const char* fSourceType;  // What we're benching: bench, GM, SKP, ...
     const char* fBenchType;   // How we bench it: micro, recording, playback, ...
     int fCurrentRecording;
     int fCurrentScale;
     int fCurrentSKP;
     int fCurrentUseMPD;
+    int fCurrentImage;
+    int fCurrentSubsetImage;
+    int fCurrentColorType;
+    const int fDivisor;
 };
 
 int nanobench_main();
 int nanobench_main() {
     SetupCrashHandler();
     SkAutoGraphics ag;
     SkTaskGroup::Enabler enabled;
 
 #if SK_SUPPORT_GPU
     GrContext::Options grContextOpts;
@@ skipping 180 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif