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// Copyright (c) 2011 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 "chrome/browser/icon_manager.h"
#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "base/task_runner.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
namespace {
void RunCallbackIfNotCanceled(
const base::CancelableTaskTracker::IsCanceledCallback& is_canceled,
const IconManager::IconRequestCallback& callback,
gfx::Image* image) {
if (is_canceled.Run())
return;
callback.Run(image);
}
} // namespace
struct IconManager::ClientRequest {
IconRequestCallback callback;
base::FilePath file_path;
IconLoader::IconSize size;
};
IconManager::IconManager() {
}
IconManager::~IconManager() {
STLDeleteValues(&icon_cache_);
}
gfx::Image* IconManager::LookupIconFromFilepath(const base::FilePath& file_name,
IconLoader::IconSize size) {
GroupMap::iterator it = group_cache_.find(file_name);
if (it != group_cache_.end())
return LookupIconFromGroup(it->second, size);
return NULL;
}
gfx::Image* IconManager::LookupIconFromGroup(const IconGroupID& group,
IconLoader::IconSize size) {
IconMap::iterator it = icon_cache_.find(CacheKey(group, size));
if (it != icon_cache_.end())
return it->second;
return NULL;
}
base::CancelableTaskTracker::TaskId IconManager::LoadIcon(
const base::FilePath& file_name,
IconLoader::IconSize size,
const IconRequestCallback& callback,
base::CancelableTaskTracker* tracker) {
IconLoader* loader = new IconLoader(file_name, size, this);
loader->AddRef();
loader->Start();
base::CancelableTaskTracker::IsCanceledCallback is_canceled;
base::CancelableTaskTracker::TaskId id =
tracker->NewTrackedTaskId(&is_canceled);
IconRequestCallback callback_runner = base::Bind(
&RunCallbackIfNotCanceled, is_canceled, callback);
ClientRequest client_request = { callback_runner, file_name, size };
requests_[loader] = client_request;
return id;
}
// IconLoader::Delegate implementation -----------------------------------------
bool IconManager::OnGroupLoaded(IconLoader* loader,
const IconGroupID& group) {
ClientRequests::iterator rit = requests_.find(loader);
if (rit == requests_.end()) {
NOTREACHED();
return false;
}
gfx::Image* result = LookupIconFromGroup(group, rit->second.size);
if (!result) {
return false;
}
return OnImageLoaded(loader, result, group);
}
bool IconManager::OnImageLoaded(
IconLoader* loader, gfx::Image* result, const IconGroupID& group) {
ClientRequests::iterator rit = requests_.find(loader);
// Balances the AddRef() in LoadIcon().
loader->Release();
// Look up our client state.
if (rit == requests_.end()) {
NOTREACHED();
return false; // Return false to indicate result should be deleted.
}
const ClientRequest& client_request = rit->second;
// Cache the bitmap. Watch out: |result| may be NULL to indicate a current
// failure. We assume that if we have an entry in |icon_cache_|
// it must not be NULL.
CacheKey key(group, client_request.size);
IconMap::iterator it = icon_cache_.find(key);
if (it != icon_cache_.end()) {
if (!result) {
delete it->second;
icon_cache_.erase(it);
} else if (result != it->second) {
it->second->SwapRepresentations(result);
delete result;
result = it->second;
}
} else if (result) {
icon_cache_[key] = result;
}
group_cache_[client_request.file_path] = group;
// Inform our client that the request has completed.
client_request.callback.Run(result);
requests_.erase(rit);
return true; // Indicates we took ownership of result.
}
IconManager::CacheKey::CacheKey(const IconGroupID& group,
IconLoader::IconSize size)
: group(group),
size(size) {
}
bool IconManager::CacheKey::operator<(const CacheKey &other) const {
if (group != other.group)
return group < other.group;
return size < other.size;
}
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