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// Copyright (c) 2006-2008 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/base_history_model.h"
#include "base/gfx/png_decoder.h"
#include "chrome/app/theme/theme_resources.h"
#include "chrome/browser/profile.h"
#include "chrome/common/jpeg_codec.h"
#include "chrome/common/resource_bundle.h"
#include "SkBitmap.h"
// Size of the favicon and thumbnail caches.
static const int kThumbnailCacheSize = 100;
// Icon to display when one isn't found for the page.
static SkBitmap* kDefaultFavicon = NULL;
// static
const int BaseHistoryModel::kHistoryScopeMonths = 18;
BaseHistoryModel::BaseHistoryModel(Profile* profile)
: profile_(profile),
observer_(NULL),
is_search_results_(false),
thumbnails_(kThumbnailCacheSize),
favicons_(kThumbnailCacheSize) {
if (!kDefaultFavicon) {
kDefaultFavicon = ResourceBundle::GetSharedInstance().
GetBitmapNamed(IDR_DEFAULT_FAVICON);
}
}
BaseHistoryModel::~BaseHistoryModel() {
}
void BaseHistoryModel::SetObserver(BaseHistoryModelObserver* observer) {
observer_ = observer;
}
BaseHistoryModelObserver* BaseHistoryModel::GetObserver() const {
return observer_;
}
SkBitmap* BaseHistoryModel::GetThumbnail(int index) {
return GetImage(THUMBNAIL, index);
}
SkBitmap* BaseHistoryModel::GetFavicon(int index) {
SkBitmap* favicon = GetImage(FAVICON, index);
return favicon ? favicon : kDefaultFavicon;
}
void BaseHistoryModel::AboutToScheduleRequest() {
if (observer_ && cancelable_consumer_.PendingRequestCount() == 0)
observer_->ModelBeginWork();
}
void BaseHistoryModel::RequestCompleted() {
if (observer_ && cancelable_consumer_.PendingRequestCount() == 1)
observer_->ModelEndWork();
}
SkBitmap* BaseHistoryModel::GetImage(ImageType image_type, int index) {
#ifndef NDEBUG
DCHECK(IsValidIndex(index));
#endif
history::URLID id = GetURLID(index);
DCHECK(id);
CacheType* cache = (image_type == THUMBNAIL) ? &thumbnails_ : &favicons_;
CacheType::iterator iter = cache->Get(id);
if (iter != cache->end()) {
// Empty bitmaps indicate one that is pending a load. We still return NULL
// in this case.
return iter->second.getSize() ? &iter->second : NULL;
}
HistoryService* history_service =
profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (!history_service)
return NULL;
// The entry isn't cached, ask the history service for it.
// Add an entry to the cache. This ensures we don't request the same page
// more than once.
cache->Put(id, SkBitmap());
// If this is the first request, we need to notify our delegate we're
// beginning work.
AboutToScheduleRequest();
// Start the request & associate the page ID with this thumbnail request.
HistoryService::Handle request;
if (image_type == THUMBNAIL) {
request = history_service->GetPageThumbnail(GetURL(index),
&cancelable_consumer_,
NewCallback(this, &BaseHistoryModel::OnThumbnailDataAvailable));
} else {
request = history_service->GetFavIconForURL(GetURL(index),
&cancelable_consumer_,
NewCallback(this, &BaseHistoryModel::OnFaviconDataAvailable));
}
cancelable_consumer_.SetClientData(history_service, request, id);
return NULL;
}
void BaseHistoryModel::OnThumbnailDataAvailable(
HistoryService::Handle request_handle,
scoped_refptr<RefCountedBytes> data) {
RequestCompleted();
if (!data || data->data.empty()) { // This gets called on failure too.
return;
}
// The client data for this request is the page ID for the thumbnail.
HistoryService* history_service =
profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
history::URLID page = cancelable_consumer_.GetClientData(history_service,
request_handle);
DCHECK(page > 0) << "Page ID is not found, maybe we forgot to set it";
scoped_ptr<SkBitmap> bitmap(JPEGCodec::Decode(
&data->data.front(), data->data.size()));
if (!bitmap.get())
return;
thumbnails_.Put(page, *bitmap);
if (observer_)
observer_->ModelChanged(false);
}
void BaseHistoryModel::OnFaviconDataAvailable(
HistoryService::Handle handle,
bool know_favicon,
scoped_refptr<RefCountedBytes> data,
bool expired,
GURL icon_url) {
RequestCompleted();
SkBitmap fav_icon;
if (!know_favicon || !data.get() ||
!PNGDecoder::Decode(&data->data, &fav_icon)) {
return;
}
history::URLID page =
cancelable_consumer_.GetClientData(
profile_->GetHistoryService(Profile::EXPLICIT_ACCESS), handle);
favicons_.Put(page, fav_icon);
if (observer_)
observer_->ModelChanged(false);
}
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