Revert 129925 - ash: Icon cache for app list to save shadow generation time.

- Add an IconCache that stores processed (resized and shadow-generated) image,
  keyed by source image + desired size;
- The cache is created with AppList controller and destroyed when controller is
  gone;
- Controller marks all entries in cache unused before showing the UI and purges
  all unused entry after dismissing UI;
- In item view, try cache first to get processed image before scheduling job,
  and update cache when background processing comes back;

BUG=120961
TEST=Verify fix for issue 120961.


Review URL: http://codereview.chromium.org/9934006

TBR=xiyuan@chromium.org
Review URL: https://chromiumcodereview.appspot.com/9959039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129931 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 87 deletions

diff --git a/ash/app_list/icon_cache.cc b/ash/app_list/icon_cache.cc
deleted file mode 100644
index dcd295c..0000000
--- a/ash/app_list/icon_cache.cc
+++ /dev/null
@@ -1,87 +0,0 @@
-// Copyright (c) 2012 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 "ash/app_list/icon_cache.h"
-
-#include "base/logging.h"
-#include "base/md5.h"
-#include "ui/gfx/size.h"
-
-namespace {
-
-// Gets cache key based on |image| contents and desired |size|.
-std::string GetKey(const SkBitmap& image, const gfx::Size& size) {
-  SkAutoLockPixels image_lock(image);
-  base::MD5Digest digest;
-  MD5Sum(image.getPixels(), image.getSize(), &digest);
-
-  return MD5DigestToBase16(digest) + "." + size.ToString();
-}
-
-}  // namespace
-
-namespace ash {
-
-// static
-IconCache* IconCache::instance_ = NULL;
-
-// static
-void IconCache::CreateInstance() {
-  DCHECK(!instance_);
-  instance_ = new IconCache;
-}
-
-// static
-void IconCache::DeleteInstance() {
-  DCHECK(instance_);
-  delete instance_;
-  instance_ = NULL;
-}
-
-// static
-IconCache* IconCache::GetInstance() {
-  DCHECK(instance_);
-  return instance_;
-}
-
-void IconCache::MarkAllEntryUnused() {
-  for (Cache::iterator i = cache_.begin(); i != cache_.end(); ++i)
-    i->second.used = false;
-}
-
-void IconCache::PurgeAllUnused() {
-  for (Cache::iterator i = cache_.begin(); i != cache_.end();) {
-    Cache::iterator current(i);
-    ++i;
-    if (!current->second.used)
-      cache_.erase(current);
-  }
-}
-
-bool IconCache::Get(const SkBitmap& src,
-                    const gfx::Size& size,
-                    SkBitmap* processed) {
-  Cache::iterator it = cache_.find(GetKey(src, size));
-  if (it == cache_.end())
-    return false;
-
-  it->second.used = true;
-
-  if (processed)
-    *processed = it->second.image;
-  return true;
-}
-
-void IconCache::Put(const SkBitmap& src,
-                    const gfx::Size& size,
-                    const SkBitmap& processed) {
-  const std::string key = GetKey(src, size);
-  cache_[key].image = processed;
-  cache_[key].used = true;
-}
-
-IconCache::IconCache() {
-}
-
-}  // namespace ash