Adding new benchmark to test image decoding performance.

bench/ImageDecodeBench.cpp

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "Benchmark.h"
-#include "SkBitmap.h"
-#include "SkData.h"
-#include "SkForceLinking.h"
-#include "SkImageDecoder.h"
-#include "SkOSFile.h"
-#include "SkStream.h"
-#include "SkString.h"
-
-__SK_FORCE_IMAGE_DECODER_LINKING;
-
-class SkCanvas;
-
-class ImageDecodeBench : public Benchmark {
-public:
-    ImageDecodeBench(void* p, const char* filename)
-    : fName("image_decode_")
-    , fFilename(filename)
-    , fStream()
-    , fValid(false) {
-        fName.append(SkOSPath::Basename(filename));
-    }
-
-    bool isSuitableFor(Backend backend) SK_OVERRIDE {
-        return backend == kNonRendering_Backend;
-    }
-
-protected:
-    const char* onGetName() SK_OVERRIDE {
-        return fName.c_str();
-    }
-
-    void onPreDraw() SK_OVERRIDE {
-        SkFILEStream fileStream(fFilename.c_str());
-        fValid = fileStream.isValid() && fileStream.getLength() > 0;
-        if (fValid) {
-            const size_t size = fileStream.getLength();
-            void* data = sk_malloc_throw(size);
-            if (fileStream.read(data, size) < size) {
-                fValid = false;
-            } else {
-                SkAutoTUnref<SkData> skdata(SkData::NewFromMalloc(data, size));
-                fStream.setData(skdata.get());
-            }
-        }
-    }
-
-    void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
-#ifdef SK_DEBUG
-        if (!fValid) {
-            SkDebugf("stream was invalid: %s\n", fName.c_str());
-            return;
-        }
-#endif
-        // Decode a bunch of times
-        SkBitmap bm;
-        for (int i = 0; i < loops; ++i) {
-            SkDEBUGCODE(bool success =) SkImageDecoder::DecodeStream(&fStream, &bm);
-#ifdef SK_DEBUG
-            if (!success) {
-                SkDebugf("failed to decode %s\n", fName.c_str());
-                return;
-            }
-#endif
-            SkDEBUGCODE(success =) fStream.rewind();
-#ifdef SK_DEBUG
-            if (!success) {
-                SkDebugf("failed to rewind %s\n", fName.c_str());
-                return;
-            }
-#endif
-        }
-    }
-
-private:
-    SkString        fName;
-    const SkString  fFilename;
-    SkMemoryStream  fStream;
-    bool            fValid;
-
-    typedef Benchmark INHERITED;
-};
-
-// These are files which call decodePalette
-//DEF_BENCH( return SkNEW_ARGS(ImageDecodeBench, ("/usr/local/google/home/scroggo/Downloads/images/hal_163x90.png")); )
-//DEF_BENCH( return SkNEW_ARGS(ImageDecodeBench, ("/usr/local/google/home/scroggo/Downloads/images/box_19_top-left.png")); )