128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "chrome/browser/icon_manager.h"
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#include <memory>
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#include <tuple>
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#include "base/bind.h"
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#include "base/stl_util.h"
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#include "base/task_runner.h"
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#include "third_party/skia/include/core/SkBitmap.h"
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#include "third_party/skia/include/core/SkCanvas.h"
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struct IconManager::ClientRequest {
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IconRequestCallback callback;
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base::FilePath file_path;
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IconLoader::IconSize size;
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};
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// static
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IconManager* IconManager::GetInstance() {
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return base::Singleton<IconManager>::get();
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}
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IconManager::IconManager() {}
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IconManager::~IconManager() {
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base::STLDeleteValues(&icon_cache_);
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}
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gfx::Image* IconManager::LookupIconFromFilepath(const base::FilePath& file_name,
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IconLoader::IconSize size) {
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GroupMap::iterator it = group_cache_.find(file_name);
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if (it != group_cache_.end())
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return LookupIconFromGroup(it->second, size);
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return NULL;
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}
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gfx::Image* IconManager::LookupIconFromGroup(const IconGroupID& group,
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IconLoader::IconSize size) {
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IconMap::iterator it = icon_cache_.find(CacheKey(group, size));
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if (it != icon_cache_.end())
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return it->second;
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return nullptr;
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}
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void IconManager::LoadIcon(const base::FilePath& file_name,
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IconLoader::IconSize size,
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const IconRequestCallback& callback) {
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IconLoader* loader = new IconLoader(file_name, size, this);
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loader->AddRef();
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loader->Start();
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ClientRequest client_request = {callback, file_name, size};
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requests_[loader] = client_request;
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}
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// IconLoader::Delegate implementation -----------------------------------------
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bool IconManager::OnGroupLoaded(IconLoader* loader, const IconGroupID& group) {
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ClientRequests::iterator rit = requests_.find(loader);
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if (rit == requests_.end()) {
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NOTREACHED();
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return false;
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}
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gfx::Image* result = LookupIconFromGroup(group, rit->second.size);
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if (!result) {
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return false;
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}
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return OnImageLoaded(loader, result, group);
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}
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bool IconManager::OnImageLoaded(IconLoader* loader,
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gfx::Image* result,
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const IconGroupID& group) {
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ClientRequests::iterator rit = requests_.find(loader);
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// Balances the AddRef() in LoadIcon().
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loader->Release();
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// Look up our client state.
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if (rit == requests_.end()) {
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NOTREACHED();
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return false; // Return false to indicate result should be deleted.
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}
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const ClientRequest& client_request = rit->second;
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// Cache the bitmap. Watch out: |result| may be NULL to indicate a current
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// failure. We assume that if we have an entry in |icon_cache_|
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// it must not be NULL.
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CacheKey key(group, client_request.size);
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IconMap::iterator it = icon_cache_.find(key);
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if (it != icon_cache_.end()) {
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if (!result) {
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delete it->second;
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icon_cache_.erase(it);
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} else if (result != it->second) {
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it->second->SwapRepresentations(result);
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delete result;
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result = it->second;
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}
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} else if (result) {
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icon_cache_[key] = result;
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}
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group_cache_[client_request.file_path] = group;
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// Inform our client that the request has completed.
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client_request.callback.Run(result);
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requests_.erase(rit);
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return true; // Indicates we took ownership of result.
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}
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IconManager::CacheKey::CacheKey(const IconGroupID& group,
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IconLoader::IconSize size)
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: group(group), size(size) {}
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bool IconManager::CacheKey::operator<(const CacheKey& other) const {
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return std::tie(group, size) < std::tie(other.group, other.size);
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}
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