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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/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/resources_util.h"
#include "chrome/browser/search/instant_io_context.h"
#include "chrome/browser/themes/browser_theme_pack.h"
#include "chrome/browser/themes/theme_properties.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 "net/url_request/url_request.h"
#include "ui/base/layout.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "url/gurl.h"
using content::BrowserThread;
namespace {
std::string GetThemePath() {
return std::string(content::kChromeUIScheme) + "://" +
std::string(chrome::kChromeUIThemePath) + "/";
}
// 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";
} // namespace
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, public:
ThemeSource::ThemeSource(Profile* profile)
: profile_(profile->GetOriginalProfile()) {
NTPResourceCache::WindowType win_type = NTPResourceCache::GetWindowType(
profile_, NULL);
css_bytes_ =
NTPResourceCacheFactory::GetForProfile(profile)->GetNewTabCSS(win_type);
}
ThemeSource::~ThemeSource() {
}
std::string ThemeSource::GetSource() const {
return chrome::kChromeUIThemePath;
}
void ThemeSource::StartDataRequest(
const std::string& path,
int render_process_id,
int render_frame_id,
const content::URLDataSource::GotDataCallback& callback) {
// Default scale factor if not specified.
float scale_factor = 1.0f;
std::string uncached_path;
webui::ParsePathAndScale(GURL(GetThemePath() + path),
&uncached_path,
&scale_factor);
if (uncached_path == kNewTabCSSPath ||
uncached_path == kNewIncognitoTabCSSPath) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
callback.Run(css_bytes_.get());
return;
}
int resource_id = ResourcesUtil::GetThemeResourceId(uncached_path);
if (resource_id != -1) {
if (GetMimeType(path) == "image/png")
SendThemeImage(callback, resource_id, scale_factor);
else
SendThemeBitmap(callback, resource_id, scale_factor);
return;
}
// We don't have any data to send back.
callback.Run(NULL);
}
std::string ThemeSource::GetMimeType(const std::string& path) const {
std::string uncached_path;
webui::ParsePathAndScale(GURL(GetThemePath() + path), &uncached_path, NULL);
if (uncached_path == kNewTabCSSPath ||
uncached_path == kNewIncognitoTabCSSPath) {
return "text/css";
}
return "image/png";
}
base::MessageLoop* ThemeSource::MessageLoopForRequestPath(
const std::string& path) const {
std::string uncached_path;
webui::ParsePathAndScale(GURL(GetThemePath() + path), &uncached_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 (!BrowserThemePack::IsPersistentImageID(resource_id))
return NULL;
return content::URLDataSource::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;
}
bool ThemeSource::ShouldServiceRequest(const net::URLRequest* request) const {
if (request->url().SchemeIs(chrome::kChromeSearchScheme))
return InstantIOContext::ShouldServiceRequest(request);
return URLDataSource::ShouldServiceRequest(request);
}
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, private:
void ThemeSource::SendThemeBitmap(
const content::URLDataSource::GotDataCallback& callback,
int resource_id,
float scale_factor) {
ui::ScaleFactor resource_scale_factor =
ui::GetSupportedScaleFactor(scale_factor);
if (BrowserThemePack::IsPersistentImageID(resource_id)) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
ui::ThemeProvider* tp = ThemeServiceFactory::GetForProfile(profile_);
DCHECK(tp);
scoped_refptr<base::RefCountedMemory> image_data(
tp->GetRawData(resource_id, resource_scale_factor));
callback.Run(image_data.get());
} else {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
callback.Run(
rb.LoadDataResourceBytesForScale(resource_id, resource_scale_factor));
}
}
void ThemeSource::SendThemeImage(
const content::URLDataSource::GotDataCallback& callback,
int resource_id,
float scale_factor) {
// If the resource bundle contains the data pack for |scale_factor|, we can
// safely fallback to SendThemeBitmap().
ResourceBundle& rb = ResourceBundle::GetSharedInstance();
if (ui::GetScaleForScaleFactor(rb.GetMaxScaleFactor()) >= scale_factor) {
SendThemeBitmap(callback, resource_id, scale_factor);
return;
}
// Otherwise, we should use gfx::ImageSkia to obtain the data. ImageSkia can
// rescale the bitmap if its backend doesn't contain the representation for
// the specified scale factor. This is the fallback path in case chrome is
// shipped without 2x resource pack but needs to use HighDPI display, which
// can happen in ChromeOS.
// TODO(mukai): remove this method itself when we ship 2x resource to all
// ChromeOS devices.
gfx::ImageSkia image;
if (BrowserThemePack::IsPersistentImageID(resource_id)) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
ui::ThemeProvider* tp = ThemeServiceFactory::GetForProfile(profile_);
DCHECK(tp);
image = *tp->GetImageSkiaNamed(resource_id);
} else {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
image = *rb.GetImageSkiaNamed(resource_id);
}
const gfx::ImageSkiaRep& rep = image.GetRepresentation(scale_factor);
scoped_refptr<base::RefCountedBytes> data(new base::RefCountedBytes());
gfx::PNGCodec::EncodeBGRASkBitmap(
rep.sk_bitmap(), false /* discard transparency */, &data->data());
callback.Run(data.get());
}
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