1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/ui/webui/ntp/favicon_webui_handler.h"
6
7#include "base/bind.h"
8#include "base/bind_helpers.h"
9#include "base/strings/string_split.h"
10#include "base/strings/string_util.h"
11#include "base/strings/stringprintf.h"
12#include "base/values.h"
13#include "chrome/browser/extensions/extension_icon_manager.h"
14#include "chrome/browser/extensions/extension_service.h"
15#include "chrome/browser/favicon/favicon_service_factory.h"
16#include "chrome/browser/history/top_sites.h"
17#include "chrome/browser/profiles/profile.h"
18#include "chrome/common/url_constants.h"
19#include "content/public/browser/web_ui.h"
20#include "grit/ui_resources.h"
21#include "third_party/skia/include/core/SkBitmap.h"
22#include "ui/base/l10n/l10n_util.h"
23#include "ui/gfx/codec/png_codec.h"
24#include "ui/gfx/color_analysis.h"
25#include "ui/gfx/favicon_size.h"
26
27namespace {
28
29StringValue* SkColorToCss(SkColor color) {
30  return new StringValue(base::StringPrintf("rgb(%d, %d, %d)",
31                                            SkColorGetR(color),
32                                            SkColorGetG(color),
33                                            SkColorGetB(color)));
34}
35
36base::StringValue* GetDominantColorCssString(
37    scoped_refptr<base::RefCountedMemory> png) {
38  color_utils::GridSampler sampler;
39  SkColor color =
40      color_utils::CalculateKMeanColorOfPNG(png, 100, 665, &sampler);
41  return SkColorToCss(color);
42}
43
44}  // namespace
45
46// Thin inheritance-dependent trampoline to forward notification of app
47// icon loads to the FaviconWebUIHandler. Base class does caching of icons.
48class ExtensionIconColorManager : public ExtensionIconManager {
49 public:
50  explicit ExtensionIconColorManager(FaviconWebUIHandler* handler)
51      : ExtensionIconManager(),
52        handler_(handler) {}
53  virtual ~ExtensionIconColorManager() {}
54
55  virtual void OnImageLoaded(const std::string& extension_id,
56                             const gfx::Image& image) OVERRIDE {
57    ExtensionIconManager::OnImageLoaded(extension_id, image);
58    handler_->NotifyAppIconReady(extension_id);
59  }
60
61 private:
62  FaviconWebUIHandler* handler_;
63};
64
65FaviconWebUIHandler::FaviconWebUIHandler()
66    : id_(0),
67      app_icon_color_manager_(new ExtensionIconColorManager(this)) {
68}
69
70FaviconWebUIHandler::~FaviconWebUIHandler() {
71}
72
73void FaviconWebUIHandler::RegisterMessages() {
74  web_ui()->RegisterMessageCallback("getFaviconDominantColor",
75      base::Bind(&FaviconWebUIHandler::HandleGetFaviconDominantColor,
76                 base::Unretained(this)));
77  web_ui()->RegisterMessageCallback("getAppIconDominantColor",
78      base::Bind(&FaviconWebUIHandler::HandleGetAppIconDominantColor,
79                 base::Unretained(this)));
80}
81
82void FaviconWebUIHandler::HandleGetFaviconDominantColor(const ListValue* args) {
83  std::string path;
84  CHECK(args->GetString(0, &path));
85  std::string prefix = "chrome://favicon/size/";
86  DCHECK(StartsWithASCII(path, prefix, false)) << "path is " << path;
87  size_t slash = path.find("/", prefix.length());
88  path = path.substr(slash + 1);
89
90  std::string dom_id;
91  CHECK(args->GetString(1, &dom_id));
92
93  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
94      Profile::FromWebUI(web_ui()), Profile::EXPLICIT_ACCESS);
95  if (!favicon_service || path.empty())
96    return;
97
98  GURL url(path);
99  // Intercept requests for prepopulated pages.
100  for (size_t i = 0; i < arraysize(history::kPrepopulatedPages); i++) {
101    if (url.spec() ==
102        l10n_util::GetStringUTF8(history::kPrepopulatedPages[i].url_id)) {
103      StringValue dom_id_value(dom_id);
104      scoped_ptr<StringValue> color(
105          SkColorToCss(history::kPrepopulatedPages[i].color));
106      web_ui()->CallJavascriptFunction("ntp.setFaviconDominantColor",
107                                       dom_id_value, *color);
108      return;
109    }
110  }
111
112  dom_id_map_[id_] = dom_id;
113  favicon_service->GetRawFaviconForURL(
114      FaviconService::FaviconForURLParams(
115          url,
116          chrome::FAVICON,
117          gfx::kFaviconSize),
118      ui::SCALE_FACTOR_100P,
119      base::Bind(&FaviconWebUIHandler::OnFaviconDataAvailable,
120                 base::Unretained(this),
121                 id_++),
122      &cancelable_task_tracker_);
123}
124
125void FaviconWebUIHandler::OnFaviconDataAvailable(
126    int id,
127    const chrome::FaviconBitmapResult& bitmap_result) {
128  scoped_ptr<StringValue> color_value;
129
130  if (bitmap_result.is_valid())
131    color_value.reset(GetDominantColorCssString(bitmap_result.bitmap_data));
132  else
133    color_value.reset(new StringValue("#919191"));
134
135  StringValue dom_id(dom_id_map_[id]);
136  web_ui()->CallJavascriptFunction("ntp.setFaviconDominantColor",
137                                   dom_id, *color_value);
138  dom_id_map_.erase(id);
139}
140
141void FaviconWebUIHandler::HandleGetAppIconDominantColor(
142    const ListValue* args) {
143  std::string extension_id;
144  CHECK(args->GetString(0, &extension_id));
145
146  ExtensionService* extension_service =
147      Profile::FromWebUI(web_ui())->GetExtensionService();
148  const extensions::Extension* extension = extension_service->GetExtensionById(
149      extension_id, false);
150  if (!extension)
151    return;
152  app_icon_color_manager_->LoadIcon(extension_service->profile(), extension);
153}
154
155void FaviconWebUIHandler::NotifyAppIconReady(const std::string& extension_id) {
156  const SkBitmap& bitmap = app_icon_color_manager_->GetIcon(extension_id);
157  // TODO(estade): would be nice to avoid a round trip through png encoding.
158  std::vector<unsigned char> bits;
159  if (!gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &bits))
160    return;
161  scoped_refptr<base::RefCountedStaticMemory> bits_mem(
162      new base::RefCountedStaticMemory(&bits.front(), bits.size()));
163  scoped_ptr<StringValue> color_value(GetDominantColorCssString(bits_mem));
164  StringValue id(extension_id);
165  web_ui()->CallJavascriptFunction(
166      "ntp.setFaviconDominantColor", id, *color_value);
167}
168