chrome/browser/ui/metro_pin_tab_helper_win.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/metro_pin_tab_helper_win.h"
   6
   7 #include <set>
   8
   9 #include "base/base_paths.h"
  10 #include "base/bind.h"
  11 #include "base/file_util.h"
  12 #include "base/files/file_path.h"
  13 #include "base/logging.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/ref_counted_memory.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/path_service.h"
  18 #include "base/strings/string_number_conversions.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "base/win/metro.h"
  21 #include "chrome/browser/favicon/favicon_tab_helper.h"
  22 #include "chrome/browser/favicon/favicon_util.h"
  23 #include "chrome/common/chrome_paths.h"
  24 #include "content/public/browser/browser_thread.h"
  25 #include "content/public/browser/web_contents.h"
  26 #include "crypto/sha2.h"
  27 #include "third_party/skia/include/core/SkCanvas.h"
  28 #include "third_party/skia/include/core/SkColor.h"
  29 #include "ui/gfx/canvas.h"
  30 #include "ui/gfx/codec/png_codec.h"
  31 #include "ui/gfx/color_analysis.h"
  32 #include "ui/gfx/color_utils.h"
  33 #include "ui/gfx/image/image.h"
  34 #include "ui/gfx/rect.h"
  35 #include "ui/gfx/size.h"
  36
  37 DEFINE_WEB_CONTENTS_USER_DATA_KEY(MetroPinTabHelper);
  38
  39 namespace {
  40
  41 // Histogram name for site-specific tile pinning metrics.
  42 const char kMetroPinMetric[] = "Metro.SecondaryTilePin";
  43
  44 // Generate an ID for the tile based on |url_str|. The ID is simply a hash of
  45 // the URL.
  46 base::string16 GenerateTileId(const base::string16& url_str) {
  47   uint8 hash[crypto::kSHA256Length];
  48   crypto::SHA256HashString(base::UTF16ToUTF8(url_str), hash, sizeof(hash));
  49   std::string hash_str = base::HexEncode(hash, sizeof(hash));
  50   return base::UTF8ToUTF16(hash_str);
  51 }
  52
  53 // Get the path of the directory to store the tile logos in.
  54 base::FilePath GetTileImagesDir() {
  55   base::FilePath tile_images_dir;
  56   if (!PathService::Get(chrome::DIR_USER_DATA, &tile_images_dir))
  57     return base::FilePath();
  58
  59   tile_images_dir = tile_images_dir.Append(L"TileImages");
  60   if (!base::DirectoryExists(tile_images_dir) &&
  61       !base::CreateDirectory(tile_images_dir))
  62     return base::FilePath();
  63
  64   return tile_images_dir;
  65 }
  66
  67 // For the given |image| and |tile_id|, try to create a site specific logo in
  68 // |logo_dir|. The path of any created logo is returned in |logo_path|. Return
  69 // value indicates whether a site specific logo was created.
  70 bool CreateSiteSpecificLogo(const SkBitmap& bitmap,
  71                             const base::string16& tile_id,
  72                             const base::FilePath& logo_dir,
  73                             base::FilePath* logo_path) {
  74   const int kLogoWidth = 120;
  75   const int kLogoHeight = 120;
  76   const int kBoxWidth = 40;
  77   const int kBoxHeight = 40;
  78   const int kCaptionHeight = 20;
  79   const double kBoxFade = 0.75;
  80
  81   if (bitmap.isNull())
  82     return false;
  83
  84   // Fill the tile logo with the dominant color of the favicon bitmap.
  85   SkColor dominant_color = color_utils::CalculateKMeanColorOfBitmap(bitmap);
  86   SkPaint paint;
  87   paint.setColor(dominant_color);
  88   gfx::Canvas canvas(gfx::Size(kLogoWidth, kLogoHeight), 1.0f,
  89                      true);
  90   canvas.DrawRect(gfx::Rect(0, 0, kLogoWidth, kLogoHeight), paint);
  91
  92   // Now paint a faded square for the favicon to go in.
  93   color_utils::HSL shift = {-1, -1, kBoxFade};
  94   paint.setColor(color_utils::HSLShift(dominant_color, shift));
  95   int box_left = (kLogoWidth - kBoxWidth) / 2;
  96   int box_top = (kLogoHeight - kCaptionHeight - kBoxHeight) / 2;
  97   canvas.DrawRect(gfx::Rect(box_left, box_top, kBoxWidth, kBoxHeight), paint);
  98
  99   // Now paint the favicon into the tile, leaving some room at the bottom for
 100   // the caption.
 101   int left = (kLogoWidth - bitmap.width()) / 2;
 102   int top = (kLogoHeight - kCaptionHeight - bitmap.height()) / 2;
 103   canvas.DrawImageInt(gfx::ImageSkia::CreateFrom1xBitmap(bitmap), left, top);
 104
 105   SkBitmap logo_bitmap = canvas.ExtractImageRep().sk_bitmap();
 106   std::vector<unsigned char> logo_png;
 107   if (!gfx::PNGCodec::EncodeBGRASkBitmap(logo_bitmap, true, &logo_png))
 108     return false;
 109
 110   *logo_path = logo_dir.Append(tile_id).ReplaceExtension(L".png");
 111   return file_util::WriteFile(*logo_path,
 112                               reinterpret_cast<char*>(&logo_png[0]),
 113                               logo_png.size()) > 0;
 114 }
 115
 116 // Get the path to the backup logo. If the backup logo already exists in
 117 // |logo_dir|, it will be used, otherwise it will be copied out of the install
 118 // folder. (The version in the install folder is not used as it may disappear
 119 // after an upgrade, causing tiles to lose their images if Windows rebuilds
 120 // its tile image cache.)
 121 // The path to the logo is returned in |logo_path|, with the return value
 122 // indicating success.
 123 bool GetPathToBackupLogo(const base::FilePath& logo_dir,
 124                          base::FilePath* logo_path) {
 125   const wchar_t kDefaultLogoFileName[] = L"SecondaryTile.png";
 126   *logo_path = logo_dir.Append(kDefaultLogoFileName);
 127   if (base::PathExists(*logo_path))
 128     return true;
 129
 130   base::FilePath default_logo_path;
 131   if (!PathService::Get(base::DIR_MODULE, &default_logo_path))
 132     return false;
 133
 134   default_logo_path = default_logo_path.Append(kDefaultLogoFileName);
 135   return base::CopyFile(default_logo_path, *logo_path);
 136 }
 137
 138 // UMA reporting callback for site-specific secondary tile creation.
 139 void PinPageReportUmaCallback(
 140     base::win::MetroSecondaryTilePinUmaResult result) {
 141   UMA_HISTOGRAM_ENUMERATION(kMetroPinMetric,
 142                             result,
 143                             base::win::METRO_PIN_STATE_LIMIT);
 144 }
 145
 146 // The PinPageTaskRunner class performs the necessary FILE thread actions to
 147 // pin a page, such as generating or copying the tile image file. When it
 148 // has performed these actions it will send the tile creation request to the
 149 // metro driver.
 150 class PinPageTaskRunner : public base::RefCountedThreadSafe<PinPageTaskRunner> {
 151  public:
 152   // Creates a task runner for the pinning operation with the given details.
 153   // |favicon| can be a null image (i.e. favicon.isNull() can be true), in
 154   // which case the backup tile image will be used.
 155   PinPageTaskRunner(const base::string16& title,
 156                     const base::string16& url,
 157                     const SkBitmap& favicon);
 158
 159   void Run();
 160   void RunOnFileThread();
 161
 162  private:
 163   ~PinPageTaskRunner() {}
 164
 165   // Details of the page being pinned.
 166   const base::string16 title_;
 167   const base::string16 url_;
 168   SkBitmap favicon_;
 169
 170   friend class base::RefCountedThreadSafe<PinPageTaskRunner>;
 171   DISALLOW_COPY_AND_ASSIGN(PinPageTaskRunner);
 172 };
 173
 174 PinPageTaskRunner::PinPageTaskRunner(const base::string16& title,
 175                                      const base::string16& url,
 176                                      const SkBitmap& favicon)
 177     : title_(title),
 178       url_(url),
 179       favicon_(favicon) {}
 180
 181 void PinPageTaskRunner::Run() {
 182   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 183
 184   content::BrowserThread::PostTask(
 185       content::BrowserThread::FILE,
 186       FROM_HERE,
 187       base::Bind(&PinPageTaskRunner::RunOnFileThread, this));
 188 }
 189
 190 void PinPageTaskRunner::RunOnFileThread() {
 191   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
 192
 193   base::string16 tile_id = GenerateTileId(url_);
 194   base::FilePath logo_dir = GetTileImagesDir();
 195   if (logo_dir.empty()) {
 196     LOG(ERROR) << "Could not create directory to store tile image.";
 197     return;
 198   }
 199
 200   base::FilePath logo_path;
 201   if (!CreateSiteSpecificLogo(favicon_, tile_id, logo_dir, &logo_path) &&
 202       !GetPathToBackupLogo(logo_dir, &logo_path)) {
 203     LOG(ERROR) << "Count not get path to logo tile.";
 204     return;
 205   }
 206
 207   UMA_HISTOGRAM_ENUMERATION(kMetroPinMetric,
 208                             base::win::METRO_PIN_LOGO_READY,
 209                             base::win::METRO_PIN_STATE_LIMIT);
 210
 211   HMODULE metro_module = base::win::GetMetroModule();
 212   if (!metro_module)
 213     return;
 214
 215   base::win::MetroPinToStartScreen metro_pin_to_start_screen =
 216       reinterpret_cast<base::win::MetroPinToStartScreen>(
 217           ::GetProcAddress(metro_module, "MetroPinToStartScreen"));
 218   if (!metro_pin_to_start_screen) {
 219     NOTREACHED();
 220     return;
 221   }
 222
 223   metro_pin_to_start_screen(tile_id,
 224                             title_,
 225                             url_,
 226                             logo_path,
 227                             base::Bind(&PinPageReportUmaCallback));
 228 }
 229
 230 }  // namespace
 231
 232 class MetroPinTabHelper::FaviconChooser {
 233  public:
 234   FaviconChooser(MetroPinTabHelper* helper,
 235                  const base::string16& title,
 236                  const base::string16& url,
 237                  const SkBitmap& history_bitmap);
 238
 239   ~FaviconChooser() {}
 240
 241   // Pin the page on the FILE thread using the current |best_candidate_| and
 242   // delete the FaviconChooser.
 243   void UseChosenCandidate();
 244
 245   // Update the |best_candidate_| with the newly downloaded favicons provided.
 246   void UpdateCandidate(int id,
 247                        const GURL& image_url,
 248                        const std::vector<SkBitmap>& bitmaps);
 249
 250   void AddPendingRequest(int request_id);
 251
 252  private:
 253   // The tab helper that this chooser is operating for.
 254   MetroPinTabHelper* helper_;
 255
 256   // Title and URL of the page being pinned.
 257   const base::string16 title_;
 258   const base::string16 url_;
 259
 260   // The best candidate we have so far for the current pin operation.
 261   SkBitmap best_candidate_;
 262
 263   // Outstanding favicon download requests.
 264   std::set<int> in_progress_requests_;
 265
 266   DISALLOW_COPY_AND_ASSIGN(FaviconChooser);
 267 };
 268
 269 MetroPinTabHelper::FaviconChooser::FaviconChooser(
 270     MetroPinTabHelper* helper,
 271     const base::string16& title,
 272     const base::string16& url,
 273     const SkBitmap& history_bitmap)
 274         : helper_(helper),
 275           title_(title),
 276           url_(url),
 277           best_candidate_(history_bitmap) {}
 278
 279 void MetroPinTabHelper::FaviconChooser::UseChosenCandidate() {
 280   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 281   scoped_refptr<PinPageTaskRunner> runner(
 282       new PinPageTaskRunner(title_, url_, best_candidate_));
 283   runner->Run();
 284   helper_->FaviconDownloaderFinished();
 285 }
 286
 287 void MetroPinTabHelper::FaviconChooser::UpdateCandidate(
 288     int id,
 289     const GURL& image_url,
 290     const std::vector<SkBitmap>& bitmaps) {
 291   const int kMaxIconSize = 32;
 292
 293   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 294
 295   std::set<int>::iterator iter = in_progress_requests_.find(id);
 296   // Check that this request is one of ours.
 297   if (iter == in_progress_requests_.end())
 298     return;
 299
 300   in_progress_requests_.erase(iter);
 301
 302   // Process the bitmaps, keeping the one that is best so far.
 303   for (std::vector<SkBitmap>::const_iterator iter = bitmaps.begin();
 304        iter != bitmaps.end();
 305        ++iter) {
 306
 307     // If the new bitmap is too big, ignore it.
 308     if (iter->height() > kMaxIconSize || iter->width() > kMaxIconSize)
 309       continue;
 310
 311     // If we don't have a best candidate yet, this is better so just grab it.
 312     if (best_candidate_.isNull()) {
 313       best_candidate_ = *iter;
 314       continue;
 315     }
 316
 317     // If it is smaller than our best one so far, ignore it.
 318     if (iter->height() <= best_candidate_.height() ||
 319         iter->width() <= best_candidate_.width()) {
 320       continue;
 321     }
 322
 323     // Othewise it is our new best candidate.
 324     best_candidate_ = *iter;
 325   }
 326
 327   // If there are no more outstanding requests, pin the page on the FILE thread.
 328   // Once this happens this downloader has done its job, so delete it.
 329   if (in_progress_requests_.empty())
 330     UseChosenCandidate();
 331 }
 332
 333 void MetroPinTabHelper::FaviconChooser::AddPendingRequest(int request_id) {
 334   in_progress_requests_.insert(request_id);
 335 }
 336
 337 MetroPinTabHelper::MetroPinTabHelper(content::WebContents* web_contents)
 338     : content::WebContentsObserver(web_contents) {
 339 }
 340
 341 MetroPinTabHelper::~MetroPinTabHelper() {}
 342
 343 bool MetroPinTabHelper::IsPinned() const {
 344   HMODULE metro_module = base::win::GetMetroModule();
 345   if (!metro_module)
 346     return false;
 347
 348   typedef BOOL (*MetroIsPinnedToStartScreen)(const base::string16&);
 349   MetroIsPinnedToStartScreen metro_is_pinned_to_start_screen =
 350       reinterpret_cast<MetroIsPinnedToStartScreen>(
 351           ::GetProcAddress(metro_module, "MetroIsPinnedToStartScreen"));
 352   if (!metro_is_pinned_to_start_screen) {
 353     NOTREACHED();
 354     return false;
 355   }
 356
 357   GURL url = web_contents()->GetURL();
 358   base::string16 tile_id = GenerateTileId(base::UTF8ToUTF16(url.spec()));
 359   return metro_is_pinned_to_start_screen(tile_id) != 0;
 360 }
 361
 362 void MetroPinTabHelper::TogglePinnedToStartScreen() {
 363   if (IsPinned()) {
 364     UMA_HISTOGRAM_ENUMERATION(kMetroPinMetric,
 365                               base::win::METRO_UNPIN_INITIATED,
 366                               base::win::METRO_PIN_STATE_LIMIT);
 367     UnPinPageFromStartScreen();
 368     return;
 369   }
 370
 371   UMA_HISTOGRAM_ENUMERATION(kMetroPinMetric,
 372                             base::win::METRO_PIN_INITIATED,
 373                             base::win::METRO_PIN_STATE_LIMIT);
 374   GURL url = web_contents()->GetURL();
 375   base::string16 url_str = base::UTF8ToUTF16(url.spec());
 376   base::string16 title = web_contents()->GetTitle();
 377   // TODO(oshima): Use scoped_ptr::Pass to pass it to other thread.
 378   SkBitmap favicon;
 379   FaviconTabHelper* favicon_tab_helper = FaviconTabHelper::FromWebContents(
 380       web_contents());
 381   if (favicon_tab_helper->FaviconIsValid()) {
 382     // Only the 1x bitmap data is needed.
 383     favicon = favicon_tab_helper->GetFavicon().AsImageSkia().GetRepresentation(
 384         1.0f).sk_bitmap();
 385   }
 386
 387   favicon_chooser_.reset(new FaviconChooser(this, title, url_str, favicon));
 388
 389   if (favicon_url_candidates_.empty()) {
 390     favicon_chooser_->UseChosenCandidate();
 391     return;
 392   }
 393
 394   // Request all the candidates.
 395   int max_image_size = 0;  // Do not resize images.
 396   for (std::vector<content::FaviconURL>::const_iterator iter =
 397            favicon_url_candidates_.begin();
 398        iter != favicon_url_candidates_.end();
 399        ++iter) {
 400     favicon_chooser_->AddPendingRequest(
 401         web_contents()->DownloadImage(iter->icon_url,
 402             true,
 403             max_image_size,
 404             base::Bind(&MetroPinTabHelper::DidDownloadFavicon,
 405                        base::Unretained(this))));
 406   }
 407
 408 }
 409
 410 void MetroPinTabHelper::DidNavigateMainFrame(
 411     const content::LoadCommittedDetails& /*details*/,
 412     const content::FrameNavigateParams& /*params*/) {
 413   // Cancel any outstanding pin operations once the user navigates away from
 414   // the page.
 415   if (favicon_chooser_.get())
 416     favicon_chooser_.reset();
 417   // Any candidate favicons we have are now out of date so clear them.
 418   favicon_url_candidates_.clear();
 419 }
 420
 421 void MetroPinTabHelper::DidUpdateFaviconURL(
 422     int32 page_id,
 423     const std::vector<content::FaviconURL>& candidates) {
 424   favicon_url_candidates_ = candidates;
 425 }
 426
 427 void MetroPinTabHelper::DidDownloadFavicon(
 428     int id,
 429     int http_status_code,
 430     const GURL& image_url,
 431     const std::vector<SkBitmap>& bitmaps,
 432     const std::vector<gfx::Size>& original_bitmap_sizes) {
 433   if (favicon_chooser_.get()) {
 434     favicon_chooser_->UpdateCandidate(id, image_url, bitmaps);
 435   }
 436 }
 437
 438 void MetroPinTabHelper::UnPinPageFromStartScreen() {
 439   HMODULE metro_module = base::win::GetMetroModule();
 440   if (!metro_module)
 441     return;
 442
 443   base::win::MetroUnPinFromStartScreen metro_un_pin_from_start_screen =
 444       reinterpret_cast<base::win::MetroUnPinFromStartScreen>(
 445           ::GetProcAddress(metro_module, "MetroUnPinFromStartScreen"));
 446   if (!metro_un_pin_from_start_screen) {
 447     NOTREACHED();
 448     return;
 449   }
 450
 451   GURL url = web_contents()->GetURL();
 452   base::string16 tile_id = GenerateTileId(base::UTF8ToUTF16(url.spec()));
 453   metro_un_pin_from_start_screen(tile_id,
 454                                  base::Bind(&PinPageReportUmaCallback));
 455 }
 456
 457 void MetroPinTabHelper::FaviconDownloaderFinished() {
 458   favicon_chooser_.reset();
 459 }