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/favicon/favicon_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 "extensions/browser/extension_registry.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
29base::StringValue* SkColorToCss(SkColor color) {
30  return new base::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 = color_utils::CalculateKMeanColorOfPNG(png);
40  return SkColorToCss(color);
41}
42
43}  // namespace
44
45// Thin inheritance-dependent trampoline to forward notification of app
46// icon loads to the FaviconWebUIHandler. Base class does caching of icons.
47class ExtensionIconColorManager : public ExtensionIconManager {
48 public:
49  explicit ExtensionIconColorManager(FaviconWebUIHandler* handler)
50      : ExtensionIconManager(),
51        handler_(handler) {}
52  virtual ~ExtensionIconColorManager() {}
53
54  virtual void OnImageLoaded(const std::string& extension_id,
55                             const gfx::Image& image) OVERRIDE {
56    ExtensionIconManager::OnImageLoaded(extension_id, image);
57    handler_->NotifyAppIconReady(extension_id);
58  }
59
60 private:
61  FaviconWebUIHandler* handler_;
62};
63
64FaviconWebUIHandler::FaviconWebUIHandler()
65    : id_(0),
66      app_icon_color_manager_(new ExtensionIconColorManager(this)) {
67}
68
69FaviconWebUIHandler::~FaviconWebUIHandler() {
70}
71
72void FaviconWebUIHandler::RegisterMessages() {
73  web_ui()->RegisterMessageCallback("getFaviconDominantColor",
74      base::Bind(&FaviconWebUIHandler::HandleGetFaviconDominantColor,
75                 base::Unretained(this)));
76  web_ui()->RegisterMessageCallback("getAppIconDominantColor",
77      base::Bind(&FaviconWebUIHandler::HandleGetAppIconDominantColor,
78                 base::Unretained(this)));
79}
80
81void FaviconWebUIHandler::HandleGetFaviconDominantColor(
82    const base::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      base::StringValue dom_id_value(dom_id);
104      scoped_ptr<base::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->GetRawFaviconForPageURL(
114      url,
115      favicon_base::FAVICON,
116      gfx::kFaviconSize,
117      base::Bind(&FaviconWebUIHandler::OnFaviconDataAvailable,
118                 base::Unretained(this),
119                 id_++),
120      &cancelable_task_tracker_);
121}
122
123void FaviconWebUIHandler::OnFaviconDataAvailable(
124    int id,
125    const favicon_base::FaviconRawBitmapResult& bitmap_result) {
126  scoped_ptr<base::StringValue> color_value;
127
128  if (bitmap_result.is_valid())
129    color_value.reset(GetDominantColorCssString(bitmap_result.bitmap_data));
130  else
131    color_value.reset(new base::StringValue("#919191"));
132
133  base::StringValue dom_id(dom_id_map_[id]);
134  web_ui()->CallJavascriptFunction("ntp.setFaviconDominantColor",
135                                   dom_id, *color_value);
136  dom_id_map_.erase(id);
137}
138
139void FaviconWebUIHandler::HandleGetAppIconDominantColor(
140    const base::ListValue* args) {
141  std::string extension_id;
142  CHECK(args->GetString(0, &extension_id));
143
144  Profile* profile = Profile::FromWebUI(web_ui());
145  extensions::ExtensionRegistry* extension_registry =
146      extensions::ExtensionRegistry::Get(profile);
147  const extensions::Extension* extension =
148      extension_registry->enabled_extensions().GetByID(extension_id);
149  if (!extension)
150    return;
151  app_icon_color_manager_->LoadIcon(profile, extension);
152}
153
154void FaviconWebUIHandler::NotifyAppIconReady(const std::string& extension_id) {
155  const SkBitmap& bitmap = app_icon_color_manager_->GetIcon(extension_id);
156  // TODO(estade): would be nice to avoid a round trip through png encoding.
157  std::vector<unsigned char> bits;
158  if (!gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &bits))
159    return;
160  scoped_refptr<base::RefCountedStaticMemory> bits_mem(
161      new base::RefCountedStaticMemory(&bits.front(), bits.size()));
162  scoped_ptr<base::StringValue> color_value(
163      GetDominantColorCssString(bits_mem));
164  base::StringValue id(extension_id);
165  web_ui()->CallJavascriptFunction(
166      "ntp.setFaviconDominantColor", id, *color_value);
167}
168