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// 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 "chrome/browser/ui/webui/theme_source.h"
#include "base/memory/ref_counted_memory.h"
#include "base/message_loop.h"
#include "base/string_number_conversions.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/resources_util.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache_factory.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/browser_thread.h"
#include "googleurl/src/gurl.h"
#include "ui/base/layout.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/theme_provider.h"
using content::BrowserThread;
namespace {
// use a resource map rather than hard-coded strings.
static const char* kNewTabCSSPath = "css/new_tab_theme.css";
static const char* kNewIncognitoTabCSSPath = "css/incognito_new_tab_theme.css";
struct ScaleFactorMap {
const char* name;
ui::ScaleFactor scale_factor;
};
const ScaleFactorMap kScaleFactorMap[] = {
{ "1x", ui::SCALE_FACTOR_100P },
{ "2x", ui::SCALE_FACTOR_200P },
};
std::string StripQueryParams(const std::string& path) {
GURL path_url = GURL(std::string(chrome::kChromeUIScheme) + "://" +
std::string(chrome::kChromeUIThemePath) + "/" + path);
return path_url.path().substr(1); // path() always includes a leading '/'.
}
std::string ParsePathAndScale(const std::string& path,
ui::ScaleFactor* scale_factor) {
// Our path may include cachebuster arguments, so trim them off.
std::string uncached_path = StripQueryParams(path);
if (scale_factor)
*scale_factor = ui::SCALE_FACTOR_100P;
// Detect and parse resource string ending in @<scale>x.
std::size_t pos = uncached_path.rfind('@');
if (pos != std::string::npos) {
if (scale_factor) {
for (size_t i = 0; i < arraysize(kScaleFactorMap); i++) {
if (uncached_path.compare(pos + 1, uncached_path.length() - pos - 1,
kScaleFactorMap[i].name) == 0) {
*scale_factor = kScaleFactorMap[i].scale_factor;
}
}
}
// Strip scale factor specification from path.
uncached_path = uncached_path.substr(0, pos);
}
return uncached_path;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, public:
ThemeSource::ThemeSource(Profile* profile)
: DataSource(chrome::kChromeUIThemePath, MessageLoop::current()),
profile_(profile->GetOriginalProfile()) {
css_bytes_ = NTPResourceCacheFactory::GetForProfile(profile)->GetNewTabCSS(
profile->IsOffTheRecord());
}
ThemeSource::~ThemeSource() {
}
void ThemeSource::StartDataRequest(const std::string& path,
bool is_incognito,
int request_id) {
// Default scale factor if not specified.
ui::ScaleFactor scale_factor;
std::string uncached_path = ParsePathAndScale(path, &scale_factor);
if (uncached_path == kNewTabCSSPath ||
uncached_path == kNewIncognitoTabCSSPath) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK((uncached_path == kNewTabCSSPath && !is_incognito) ||
(uncached_path == kNewIncognitoTabCSSPath && is_incognito));
SendResponse(request_id, css_bytes_);
return;
} else {
int resource_id = ResourcesUtil::GetThemeResourceId(uncached_path);
if (resource_id != -1) {
SendThemeBitmap(request_id, resource_id, scale_factor);
return;
}
}
// We don't have any data to send back.
SendResponse(request_id, NULL);
}
std::string ThemeSource::GetMimeType(const std::string& path) const {
std::string uncached_path = ParsePathAndScale(path, NULL);
if (uncached_path == kNewTabCSSPath ||
uncached_path == kNewIncognitoTabCSSPath) {
return "text/css";
}
return "image/png";
}
MessageLoop* ThemeSource::MessageLoopForRequestPath(
const std::string& path) const {
std::string uncached_path = ParsePathAndScale(path, NULL);
if (uncached_path == kNewTabCSSPath ||
uncached_path == kNewIncognitoTabCSSPath) {
// We generated and cached this when we initialized the object. We don't
// have to go back to the UI thread to send the data.
return NULL;
}
// If it's not a themeable image, we don't need to go to the UI thread.
int resource_id = ResourcesUtil::GetThemeResourceId(uncached_path);
if (!ThemeService::IsThemeableImage(resource_id))
return NULL;
return DataSource::MessageLoopForRequestPath(path);
}
bool ThemeSource::ShouldReplaceExistingSource() const {
// We currently get the css_bytes_ in the ThemeSource constructor, so we need
// to recreate the source itself when a theme changes.
return true;
}
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, private:
void ThemeSource::SendThemeBitmap(int request_id,
int resource_id,
ui::ScaleFactor scale_factor) {
if (ThemeService::IsThemeableImage(resource_id)) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
ui::ThemeProvider* tp = ThemeServiceFactory::GetForProfile(profile_);
DCHECK(tp);
// TODO(flackr): Pass scale factor when fetching themeable images.
scoped_refptr<base::RefCountedMemory> image_data(tp->GetRawData(
resource_id));
SendResponse(request_id, image_data);
} else {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
SendResponse(request_id,
rb.LoadDataResourceBytes(resource_id, scale_factor));
}
}
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