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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/ui/webui/ntp/favicon_webui_handler.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/string_split.h"
#include "base/string_util.h"
#include "base/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_icon_manager.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/extensions/extension_resource.h"
#include "chrome/common/url_constants.h"
#include "grit/ui_resources.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/color_analysis.h"
// Thin inheritance-dependent trampoline to forward notification of app
// icon loads to the FaviconWebUIHandler. Base class does caching of icons.
class ExtensionIconColorManager : public ExtensionIconManager {
public:
explicit ExtensionIconColorManager(FaviconWebUIHandler* handler)
: ExtensionIconManager(),
handler_(handler) {}
virtual ~ExtensionIconColorManager() {}
virtual void OnImageLoaded(SkBitmap* image,
const ExtensionResource& resource,
int index) OVERRIDE {
ExtensionIconManager::OnImageLoaded(image, resource, index);
handler_->NotifyAppIconReady(resource.extension_id());
}
private:
FaviconWebUIHandler* handler_;
};
FaviconWebUIHandler::FaviconWebUIHandler()
: id_(0),
app_icon_color_manager_(new ExtensionIconColorManager(this)) {
}
FaviconWebUIHandler::~FaviconWebUIHandler() {
}
void FaviconWebUIHandler::RegisterMessages() {
web_ui_->RegisterMessageCallback("getFaviconDominantColor",
base::Bind(&FaviconWebUIHandler::HandleGetFaviconDominantColor,
base::Unretained(this)));
web_ui_->RegisterMessageCallback("getAppIconDominantColor",
base::Bind(&FaviconWebUIHandler::HandleGetAppIconDominantColor,
base::Unretained(this)));
}
void FaviconWebUIHandler::HandleGetFaviconDominantColor(const ListValue* args) {
std::string path;
CHECK(args->GetString(0, &path));
DCHECK(StartsWithASCII(path, "chrome://favicon/size/16/", false)) <<
"path is " << path;
path = path.substr(arraysize("chrome://favicon/size/16/") - 1);
std::string dom_id;
CHECK(args->GetString(1, &dom_id));
dom_id_map_[id_] = dom_id;
FaviconService* favicon_service =
Profile::FromWebUI(web_ui_)->GetFaviconService(Profile::EXPLICIT_ACCESS);
if (!favicon_service || path.empty())
return;
FaviconService::Handle handle = favicon_service->GetFaviconForURL(
GURL(path),
history::FAVICON,
&consumer_,
base::Bind(&FaviconWebUIHandler::OnFaviconDataAvailable,
base::Unretained(this)));
consumer_.SetClientData(favicon_service, handle, id_++);
}
void FaviconWebUIHandler::OnFaviconDataAvailable(
FaviconService::Handle request_handle,
history::FaviconData favicon) {
FaviconService* favicon_service =
Profile::FromWebUI(web_ui_)->GetFaviconService(Profile::EXPLICIT_ACCESS);
int id = consumer_.GetClientData(favicon_service, request_handle);
scoped_ptr<StringValue> color_value;
if (favicon.is_valid())
color_value.reset(GetDominantColorCssString(favicon.image_data));
else
color_value.reset(new StringValue("#919191"));
StringValue dom_id(dom_id_map_[id]);
web_ui_->CallJavascriptFunction("ntp4.setStripeColor", dom_id, *color_value);
dom_id_map_.erase(id);
}
StringValue* FaviconWebUIHandler::GetDominantColorCssString(
scoped_refptr<RefCountedMemory> png) {
color_utils::GridSampler sampler;
SkColor color = color_utils::CalculateKMeanColorOfPNG(png, 100, 665, sampler);
std::string css_color = base::StringPrintf("rgb(%d, %d, %d)",
SkColorGetR(color),
SkColorGetG(color),
SkColorGetB(color));
return new StringValue(css_color);
}
void FaviconWebUIHandler::HandleGetAppIconDominantColor(
const ListValue* args) {
std::string extension_id;
CHECK(args->GetString(0, &extension_id));
ExtensionService* extension_service =
Profile::FromWebUI(web_ui_)->GetExtensionService();
const Extension* extension = extension_service->GetExtensionById(
extension_id, false);
if (!extension)
return;
app_icon_color_manager_->LoadIcon(extension);
}
void FaviconWebUIHandler::NotifyAppIconReady(const std::string& extension_id) {
const SkBitmap& bitmap = app_icon_color_manager_->GetIcon(extension_id);
// TODO(estade): would be nice to avoid a round trip through png encoding.
std::vector<unsigned char> bits;
if (!gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &bits))
return;
scoped_refptr<RefCountedStaticMemory> bits_mem(
new RefCountedStaticMemory(&bits.front(), bits.size()));
scoped_ptr<StringValue> color_value(GetDominantColorCssString(bits_mem));
StringValue id(extension_id);
web_ui_->CallJavascriptFunction(
"ntp4.setStripeColor", id, *color_value);
}
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