chrome/browser/media/desktop_media_list_ash.cc

   1 // Copyright 2013 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/media/desktop_media_list_ash.h"
   6
   7 #include <set>
   8
   9 #include "ash/shell.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "base/hash.h"
  12 #include "base/logging.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "base/threading/sequenced_worker_pool.h"
  15 #include "chrome/browser/media/desktop_media_list_observer.h"
  16 #include "chrome/grit/generated_resources.h"
  17 #include "content/public/browser/browser_thread.h"
  18 #include "media/base/video_util.h"
  19 #include "ui/base/l10n/l10n_util.h"
  20 #include "ui/compositor/dip_util.h"
  21 #include "ui/gfx/image/image.h"
  22 #include "ui/snapshot/snapshot.h"
  23
  24 using content::BrowserThread;
  25 using content::DesktopMediaID;
  26
  27 namespace {
  28
  29 // Update the list twice per second.
  30 const int kDefaultUpdatePeriod = 500;
  31
  32 }  // namespace
  33
  34 DesktopMediaListAsh::SourceDescription::SourceDescription(
  35     DesktopMediaID id,
  36     const base::string16& name)
  37     : id(id),
  38       name(name) {
  39 }
  40
  41 DesktopMediaListAsh::DesktopMediaListAsh(int source_types)
  42     : source_types_(source_types),
  43       update_period_(base::TimeDelta::FromMilliseconds(kDefaultUpdatePeriod)),
  44       thumbnail_size_(100, 100),
  45       view_dialog_id_(-1),
  46       observer_(NULL),
  47       pending_window_capture_requests_(0),
  48       weak_factory_(this) {
  49 }
  50
  51 DesktopMediaListAsh::~DesktopMediaListAsh() {}
  52
  53 void DesktopMediaListAsh::SetUpdatePeriod(base::TimeDelta period) {
  54   DCHECK(!observer_);
  55   update_period_ = period;
  56 }
  57
  58 void DesktopMediaListAsh::SetThumbnailSize(
  59     const gfx::Size& thumbnail_size) {
  60   thumbnail_size_ = thumbnail_size;
  61 }
  62
  63 void DesktopMediaListAsh::SetViewDialogWindowId(
  64     content::DesktopMediaID::Id dialog_id) {
  65   view_dialog_id_ = dialog_id;
  66 }
  67
  68 void DesktopMediaListAsh::StartUpdating(DesktopMediaListObserver* observer) {
  69   DCHECK(!observer_);
  70
  71   observer_ = observer;
  72   Refresh();
  73 }
  74
  75 int DesktopMediaListAsh::GetSourceCount() const {
  76   return sources_.size();
  77 }
  78
  79 const DesktopMediaList::Source& DesktopMediaListAsh::GetSource(
  80     int index) const {
  81   return sources_[index];
  82 }
  83
  84 void DesktopMediaListAsh::Refresh() {
  85   std::vector<SourceDescription> new_sources;
  86   EnumerateSources(&new_sources);
  87
  88   typedef std::set<content::DesktopMediaID> SourceSet;
  89   SourceSet new_source_set;
  90   for (size_t i = 0; i < new_sources.size(); ++i) {
  91     new_source_set.insert(new_sources[i].id);
  92   }
  93   // Iterate through the old sources to find the removed sources.
  94   for (size_t i = 0; i < sources_.size(); ++i) {
  95     if (new_source_set.find(sources_[i].id) == new_source_set.end()) {
  96       sources_.erase(sources_.begin() + i);
  97       observer_->OnSourceRemoved(i);
  98       --i;
  99     }
 100   }
 101   // Iterate through the new sources to find the added sources.
 102   if (new_sources.size() > sources_.size()) {
 103     SourceSet old_source_set;
 104     for (size_t i = 0; i < sources_.size(); ++i) {
 105       old_source_set.insert(sources_[i].id);
 106     }
 107
 108     for (size_t i = 0; i < new_sources.size(); ++i) {
 109       if (old_source_set.find(new_sources[i].id) == old_source_set.end()) {
 110         sources_.insert(sources_.begin() + i, Source());
 111         sources_[i].id = new_sources[i].id;
 112         sources_[i].name = new_sources[i].name;
 113         observer_->OnSourceAdded(i);
 114       }
 115     }
 116   }
 117   DCHECK_EQ(new_sources.size(), sources_.size());
 118
 119   // Find the moved/changed sources.
 120   size_t pos = 0;
 121   while (pos < sources_.size()) {
 122     if (!(sources_[pos].id == new_sources[pos].id)) {
 123       // Find the source that should be moved to |pos|, starting from |pos + 1|
 124       // of |sources_|, because entries before |pos| should have been sorted.
 125       size_t old_pos = pos + 1;
 126       for (; old_pos < sources_.size(); ++old_pos) {
 127         if (sources_[old_pos].id == new_sources[pos].id)
 128           break;
 129       }
 130       DCHECK(sources_[old_pos].id == new_sources[pos].id);
 131
 132       // Move the source from |old_pos| to |pos|.
 133       Source temp = sources_[old_pos];
 134       sources_.erase(sources_.begin() + old_pos);
 135       sources_.insert(sources_.begin() + pos, temp);
 136
 137       observer_->OnSourceMoved(old_pos, pos);
 138     }
 139
 140     if (sources_[pos].name != new_sources[pos].name) {
 141       sources_[pos].name = new_sources[pos].name;
 142       observer_->OnSourceNameChanged(pos);
 143     }
 144     ++pos;
 145   }
 146 }
 147
 148 void DesktopMediaListAsh::EnumerateWindowsForRoot(
 149     std::vector<DesktopMediaListAsh::SourceDescription>* sources,
 150     aura::Window* root_window,
 151     int container_id) {
 152   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 153
 154   aura::Window* container = ash::Shell::GetContainer(root_window, container_id);
 155   if (!container)
 156     return;
 157   for (aura::Window::Windows::const_iterator it = container->children().begin();
 158        it != container->children().end(); ++it) {
 159     if (!(*it)->IsVisible() || !(*it)->CanFocus())
 160       continue;
 161     content::DesktopMediaID id =
 162         content::DesktopMediaID::RegisterAuraWindow(*it);
 163     if (id.id == view_dialog_id_)
 164       continue;
 165     SourceDescription window_source(id, (*it)->title());
 166     sources->push_back(window_source);
 167
 168     CaptureThumbnail(window_source.id, *it);
 169   }
 170 }
 171
 172 void DesktopMediaListAsh::EnumerateSources(
 173     std::vector<DesktopMediaListAsh::SourceDescription>* sources) {
 174   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 175
 176   aura::Window::Windows root_windows = ash::Shell::GetAllRootWindows();
 177
 178   for (size_t i = 0; i < root_windows.size(); ++i) {
 179     if (source_types_ & SCREENS) {
 180       SourceDescription screen_source(
 181           content::DesktopMediaID::RegisterAuraWindow(root_windows[i]),
 182           root_windows[i]->title());
 183
 184       if (root_windows[i] == ash::Shell::GetPrimaryRootWindow())
 185         sources->insert(sources->begin(), screen_source);
 186       else
 187         sources->push_back(screen_source);
 188
 189       if (screen_source.name.empty()) {
 190         if (root_windows.size() > 1) {
 191           screen_source.name = l10n_util::GetStringFUTF16Int(
 192               IDS_DESKTOP_MEDIA_PICKER_MULTIPLE_SCREEN_NAME,
 193               static_cast<int>(i + 1));
 194         } else {
 195           screen_source.name = l10n_util::GetStringUTF16(
 196               IDS_DESKTOP_MEDIA_PICKER_SINGLE_SCREEN_NAME);
 197         }
 198       }
 199
 200       CaptureThumbnail(screen_source.id, root_windows[i]);
 201     }
 202
 203     if (source_types_ & WINDOWS) {
 204       EnumerateWindowsForRoot(
 205           sources, root_windows[i], ash::kShellWindowId_DefaultContainer);
 206       EnumerateWindowsForRoot(
 207           sources, root_windows[i], ash::kShellWindowId_AlwaysOnTopContainer);
 208       EnumerateWindowsForRoot(
 209           sources, root_windows[i], ash::kShellWindowId_DockedContainer);
 210     }
 211   }
 212 }
 213
 214 void DesktopMediaListAsh::CaptureThumbnail(content::DesktopMediaID id,
 215                                            aura::Window* window) {
 216   gfx::Rect window_rect(window->bounds().width(), window->bounds().height());
 217   gfx::Rect scaled_rect = media::ComputeLetterboxRegion(
 218       gfx::Rect(thumbnail_size_), window_rect.size());
 219
 220   ++pending_window_capture_requests_;
 221   ui::GrabWindowSnapshotAndScaleAsync(
 222       window,
 223       window_rect,
 224       scaled_rect.size(),
 225       BrowserThread::GetBlockingPool(),
 226       base::Bind(&DesktopMediaListAsh::OnThumbnailCaptured,
 227                  weak_factory_.GetWeakPtr(),
 228                  id));
 229 }
 230
 231 void DesktopMediaListAsh::OnThumbnailCaptured(content::DesktopMediaID id,
 232                                               const gfx::Image& image) {
 233   for (size_t i = 0; i < sources_.size(); ++i) {
 234     if (sources_[i].id == id) {
 235       sources_[i].thumbnail = image.AsImageSkia();
 236       observer_->OnSourceThumbnailChanged(i);
 237       break;
 238     }
 239   }
 240
 241   --pending_window_capture_requests_;
 242   DCHECK_GE(pending_window_capture_requests_, 0);
 243
 244   if (!pending_window_capture_requests_) {
 245     // Once we've finished capturing all windows post a task for the next list
 246     // update.
 247     BrowserThread::PostDelayedTask(
 248         BrowserThread::UI, FROM_HERE,
 249         base::Bind(&DesktopMediaListAsh::Refresh,
 250                    weak_factory_.GetWeakPtr()),
 251         update_period_);
 252   }
 253 }