Implement a first pass at thumbnail store storage to disk, including a unit test for the new behavior.

TEST=covered by unittest
BUG=none

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17670 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 174 insertions, 0 deletions

diff --git a/chrome/browser/thumbnail_store_unittest.cc b/chrome/browser/thumbnail_store_unittest.cc
new file mode 100644
index 0000000..53ec322
--- /dev/null
+++ b/chrome/browser/thumbnail_store_unittest.cc
@@ -0,0 +1,174 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string.h>
+#include <iostream>
+
+#include "chrome/browser/thumbnail_store.h"
+
+#include "base/time.h"
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/gfx/jpeg_codec.h"
+#include "base/path_service.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/thumbnail_score.h"
+#include "chrome/tools/profiles/thumbnail-inl.h"
+#include "googleurl/src/gurl.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkPixelRef.h"
+
+inline unsigned int diff(unsigned int a, unsigned int b) {
+  return a>b ? a-b : b-a;
+}
+
+class ThumbnailStoreTest : public testing::Test {
+ public:
+  ThumbnailStoreTest() : score1_(.5, true, false),
+    url1_("http://www.google.com"), url2_("http://www.elgoog.com") {
+  }
+  ~ThumbnailStoreTest() {
+  }
+
+ protected:
+  void SetUp();
+
+  void TearDown() {
+    file_util::Delete(file_path_.AppendASCII(url1_.host()), false);
+    file_util::Delete(file_path_.AppendASCII(url2_.host()), false);
+  }
+
+  // Compute the max difference over all pixels for each RGBA component.
+  void PrintPixelDiff(SkBitmap* image_a, SkBitmap* image_b);
+
+  // The directory where ThumbnailStore will store data.
+  FilePath file_path_;
+
+  SkBitmap read_image_, image_enc_dec_, image_;
+  ThumbnailScore score1_, score2_;
+  GURL url1_, url2_;
+  base::Time time_;
+};
+
+void ThumbnailStoreTest::SetUp() {
+  if (!file_util::GetTempDir(&file_path_))
+    FAIL();
+
+  // Delete any old thumbnail files if they exist.
+  file_util::Delete(file_path_.AppendASCII(url1_.host()), false);
+  file_util::Delete(file_path_.AppendASCII(url2_.host()), false);
+
+  // image is the original SkBitmap representing the thumbnail
+  image_ = *(JPEGCodec::Decode(kGoogleThumbnail, sizeof(kGoogleThumbnail)));
+
+  // The ThumbnailStore will encode the thumbnail to jpeg at 90% quality, so
+  // we do this to image.  When image is stored, image_enc_dec_ is what
+  // ThumbnailStore should return.
+  std::vector<unsigned char> jpeg_data;
+  SkAutoLockPixels thumbnail_lock(image_);
+  bool encoded = JPEGCodec::Encode(
+      reinterpret_cast<unsigned char*>(image_.getAddr32(0, 0)),
+      JPEGCodec::FORMAT_BGRA, image_.width(),
+      image_.height(),
+      static_cast<int>(image_.rowBytes()), 90,
+      &jpeg_data);
+
+  image_enc_dec_ = *(JPEGCodec::Decode(
+                        reinterpret_cast<const unsigned char*>(&jpeg_data[0]),
+                        jpeg_data.size()));
+}
+
+void ThumbnailStoreTest::PrintPixelDiff(SkBitmap* image_a, SkBitmap* image_b) {
+  // Compute the maximum difference in each of the RGBA components across all
+  // pixels between the retrieved SkBitmap and the original.  These
+  // differences should be small since encoding was done at 90% before
+  // writing to disk.
+
+  SkAutoLockPixels lock_a(*image_a);
+  SkAutoLockPixels lock_b(*image_b);
+
+  int ppr = read_image_.rowBytesAsPixels();
+  unsigned int *a, *b;
+  unsigned int maxv[4];
+  memset(maxv, 0, sizeof(maxv));
+
+  for (int nrows = read_image_.height()-1; nrows >= 0; nrows--) {
+    a = image_a->getAddr32(0, nrows);
+    b = image_b->getAddr32(0, nrows);
+    for (int i = 0; i < ppr; i += 4) {
+      for (int j = 0; j < 4; j++) {
+        maxv[j] = std::max(diff(*(a+i) >> (j<<3) & 0xff,
+                                *(b+i) >> (j<<3) & 0xff),
+                           maxv[j]);
+      }
+    }
+  }
+
+  std::cout << "Max diff btwn original and encoded image (b,g,r,a) = ("
+            << maxv[0] << ","
+            << maxv[1] << ","
+            << maxv[2] << ","
+            << maxv[3] << ")" << std::endl;
+}
+
+TEST_F(ThumbnailStoreTest, RetrieveFromCache) {
+  ThumbnailStore* store = new ThumbnailStore;
+  store->AddRef();
+  store->file_path_ = file_path_;
+  store->cache_.reset(new ThumbnailStore::Cache);
+  store->cache_initialized_ = true;
+
+  read_image_.reset();
+
+  // Retrieve a thumbnail/score for a nonexistent page.
+
+  EXPECT_FALSE(store->GetPageThumbnail(url2_, &read_image_, &score2_));
+
+  // Store a thumbnail into the cache and retrieve it.
+
+  EXPECT_TRUE(store->SetPageThumbnail(url1_, image_, score1_, false));
+  EXPECT_TRUE(store->GetPageThumbnail(url1_, &read_image_, &score2_));
+  EXPECT_TRUE(score1_.Equals(score2_));
+  EXPECT_TRUE(read_image_.getSize() == image_.getSize());
+  EXPECT_TRUE(read_image_.pixelRef() == image_.pixelRef());
+  EXPECT_FALSE(read_image_.isNull());
+
+  store->Release();
+}
+
+TEST_F(ThumbnailStoreTest, RetrieveFromDisk) {
+  ThumbnailStore* store = new ThumbnailStore;
+  store->AddRef();
+  store->file_path_ = file_path_;
+  store->cache_.reset(new ThumbnailStore::Cache);
+  store->cache_initialized_ = true;
+
+  read_image_.reset();
+
+  // Store a thumbnail onto the disk and retrieve it.
+
+  EXPECT_TRUE(store->SetPageThumbnail(url1_, image_, score1_, false));
+  EXPECT_TRUE(store->WriteThumbnailToDisk(url1_));
+  EXPECT_TRUE(store->GetPageThumbnailFromDisk(
+      file_path_.AppendASCII(url1_.host()), &url2_, &read_image_, &score2_));
+  EXPECT_TRUE(url1_ == url2_);
+  EXPECT_TRUE(score1_.Equals(score2_));
+  EXPECT_TRUE(read_image_.getSize() == image_enc_dec_.getSize());
+  EXPECT_FALSE(read_image_.isNull());
+
+  // The retrieved SkBitmap should be the same as the original image
+  // encoded at 90% quality to jpeg, then decoded.
+
+  {
+    SkAutoLockPixels lock_a(read_image_);
+    SkAutoLockPixels lock_b(image_enc_dec_);
+    EXPECT_TRUE(0 == memcmp(read_image_.getPixels(),
+                            image_enc_dec_.getPixels(),
+                            read_image_.getSize()));
+  }
+  PrintPixelDiff(&read_image_, &image_);
+
+  store->Release();
+}