chrome/browser/ui/webui/ntp/favicon_webui_handler.cc

   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
  27 namespace {
  28
  29 base::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
  36 base::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.
  48 class 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
  65 FaviconWebUIHandler::FaviconWebUIHandler()
  66     : id_(0),
  67       app_icon_color_manager_(new ExtensionIconColorManager(this)) {
  68 }
  69
  70 FaviconWebUIHandler::~FaviconWebUIHandler() {
  71 }
  72
  73 void 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
  82 void FaviconWebUIHandler::HandleGetFaviconDominantColor(
  83     const base::ListValue* args) {
  84   std::string path;
  85   CHECK(args->GetString(0, &path));
  86   std::string prefix = "chrome://favicon/size/";
  87   DCHECK(StartsWithASCII(path, prefix, false)) << "path is " << path;
  88   size_t slash = path.find("/", prefix.length());
  89   path = path.substr(slash + 1);
  90
  91   std::string dom_id;
  92   CHECK(args->GetString(1, &dom_id));
  93
  94   FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
  95       Profile::FromWebUI(web_ui()), Profile::EXPLICIT_ACCESS);
  96   if (!favicon_service || path.empty())
  97     return;
  98
  99   GURL url(path);
 100   // Intercept requests for prepopulated pages.
 101   for (size_t i = 0; i < arraysize(history::kPrepopulatedPages); i++) {
 102     if (url.spec() ==
 103         l10n_util::GetStringUTF8(history::kPrepopulatedPages[i].url_id)) {
 104       base::StringValue dom_id_value(dom_id);
 105       scoped_ptr<base::StringValue> color(
 106           SkColorToCss(history::kPrepopulatedPages[i].color));
 107       web_ui()->CallJavascriptFunction("ntp.setFaviconDominantColor",
 108                                        dom_id_value, *color);
 109       return;
 110     }
 111   }
 112
 113   dom_id_map_[id_] = dom_id;
 114   favicon_service->GetRawFaviconForURL(
 115       FaviconService::FaviconForURLParams(
 116           url,
 117           chrome::FAVICON,
 118           gfx::kFaviconSize),
 119       ui::SCALE_FACTOR_100P,
 120       base::Bind(&FaviconWebUIHandler::OnFaviconDataAvailable,
 121                  base::Unretained(this),
 122                  id_++),
 123       &cancelable_task_tracker_);
 124 }
 125
 126 void FaviconWebUIHandler::OnFaviconDataAvailable(
 127     int id,
 128     const chrome::FaviconBitmapResult& bitmap_result) {
 129   scoped_ptr<base::StringValue> color_value;
 130
 131   if (bitmap_result.is_valid())
 132     color_value.reset(GetDominantColorCssString(bitmap_result.bitmap_data));
 133   else
 134     color_value.reset(new base::StringValue("#919191"));
 135
 136   base::StringValue dom_id(dom_id_map_[id]);
 137   web_ui()->CallJavascriptFunction("ntp.setFaviconDominantColor",
 138                                    dom_id, *color_value);
 139   dom_id_map_.erase(id);
 140 }
 141
 142 void FaviconWebUIHandler::HandleGetAppIconDominantColor(
 143     const base::ListValue* args) {
 144   std::string extension_id;
 145   CHECK(args->GetString(0, &extension_id));
 146
 147   ExtensionService* extension_service =
 148       Profile::FromWebUI(web_ui())->GetExtensionService();
 149   const extensions::Extension* extension = extension_service->GetExtensionById(
 150       extension_id, false);
 151   if (!extension)
 152     return;
 153   app_icon_color_manager_->LoadIcon(extension_service->profile(), extension);
 154 }
 155
 156 void FaviconWebUIHandler::NotifyAppIconReady(const std::string& extension_id) {
 157   const SkBitmap& bitmap = app_icon_color_manager_->GetIcon(extension_id);
 158   // TODO(estade): would be nice to avoid a round trip through png encoding.
 159   std::vector<unsigned char> bits;
 160   if (!gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, true, &bits))
 161     return;
 162   scoped_refptr<base::RefCountedStaticMemory> bits_mem(
 163       new base::RefCountedStaticMemory(&bits.front(), bits.size()));
 164   scoped_ptr<base::StringValue> color_value(
 165       GetDominantColorCssString(bits_mem));
 166   base::StringValue id(extension_id);
 167   web_ui()->CallJavascriptFunction(
 168       "ntp.setFaviconDominantColor", id, *color_value);
 169 }