Index: chrome/browser/net/client_hints.cc |
diff --git a/chrome/browser/net/client_hints.cc b/chrome/browser/net/client_hints.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4d500a133d3668f24f08f3f52bcdf329a0f888ad |
--- /dev/null |
+++ b/chrome/browser/net/client_hints.cc |
@@ -0,0 +1,53 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "chrome/browser/net/client_hints.h" |
+ |
+#include "base/bind.h" |
+#include "base/stringprintf.h" |
+#include "content/public/browser/browser_thread.h" |
+#include "ui/gfx/screen.h" |
+ |
+namespace { |
+ |
+void FetchScreenInfoOnUIThread(ClientHints::ScreenInfo* info) { |
+ DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)); |
+ gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay(); |
+ info->width = display.GetSizeInPixel().width(); |
+ info->height = display.GetSizeInPixel().height(); |
+ info->pixel_ratio = display.device_scale_factor(); |
+} |
+ |
+} // namespace |
+ |
+ClientHints::ClientHints() : |
+ weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) { |
+} |
+ |
+ClientHints::~ClientHints() { |
+} |
+ |
+bool ClientHints::RetrieveScreenInfo() { |
+ DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO)); |
+ ClientHints::ScreenInfo* info = new ClientHints::ScreenInfo(); |
+ return content::BrowserThread::PostTaskAndReply( |
+ content::BrowserThread::UI, |
+ FROM_HERE, |
+ base::Bind(&FetchScreenInfoOnUIThread, info), |
+ base::Bind(&ClientHints::UpdateScreenInfo, weak_ptr_factory_.GetWeakPtr(), |
+ base::Owned(info))); |
mmenke
2013/02/27 21:06:05
What if the user changes screen resolution?
bengr
2013/03/06 00:34:19
I presume that screen resolution changes are much
Ryan Sleevi
2013/03/06 00:38:19
Why isn't an orientation change considered a resol
|
+} |
+ |
+std::string ClientHints::GetScreenInfoHints() { |
mmenke
2013/02/27 21:06:05
optional: Could just make this return a const str
bengr
2013/03/06 00:34:19
Done.
|
+ return screen_hints_; |
+} |
+ |
+void ClientHints::UpdateScreenInfo(ClientHints::ScreenInfo* info) { |
+ if (info->height > 0 && info->width > 0 && info->pixel_ratio > 0.0) { |
+ screen_hints_ = base::StringPrintf( |
+ "dh=%d, dw=%d, dpr=%0.3g", |
+ info->height, info->width, info->pixel_ratio); |
+ } |
+} |
+ |