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