chrome/browser/renderer_host/pepper/monitor_finder_mac.mm

   1 // Copyright 2014 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/renderer_host/pepper/monitor_finder_mac.h"
   6
   7 #import <Cocoa/Cocoa.h>
   8
   9 #include "content/public/browser/browser_thread.h"
  10 #include "content/public/browser/render_frame_host.h"
  11
  12 namespace chrome {
  13
  14 MonitorFinder::MonitorFinder(int process_id, int render_frame_id)
  15     : process_id_(process_id),
  16       render_frame_id_(render_frame_id),
  17       request_sent_(false),
  18       display_id_(kCGNullDirectDisplay) {}
  19
  20 MonitorFinder::~MonitorFinder() {}
  21
  22 int64_t MonitorFinder::GetMonitor() {
  23   {
  24     // The plugin may call this method several times, so avoid spamming the UI
  25     // thread with requests by only allowing one outstanding request at a time.
  26     base::AutoLock lock(mutex_);
  27     if (request_sent_)
  28       return display_id_;
  29     request_sent_ = true;
  30   }
  31
  32   content::BrowserThread::PostTask(
  33       content::BrowserThread::UI,
  34       FROM_HERE,
  35       base::Bind(&MonitorFinder::FetchMonitorFromWidget, this));
  36   return display_id_;
  37 }
  38
  39 // static
  40 bool MonitorFinder::IsMonitorBuiltIn(int64_t display_id) {
  41   return CGDisplayIsBuiltin(display_id);
  42 }
  43
  44 void MonitorFinder::FetchMonitorFromWidget() {
  45   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  46   content::RenderFrameHost* rfh =
  47       content::RenderFrameHost::FromID(process_id_, render_frame_id_);
  48   if (!rfh)
  49     return;
  50
  51   gfx::NativeView native_view = rfh->GetNativeView();
  52   NSWindow* window = [native_view window];
  53   NSScreen* screen = [window screen];
  54   CGDirectDisplayID display_id =
  55       [[[screen deviceDescription] objectForKey:@"NSScreenNumber"] intValue];
  56
  57   base::AutoLock lock(mutex_);
  58   request_sent_ = false;
  59   display_id_ = display_id;
  60 }
  61
  62 }  // namespace chrome