| // Copyright 2012 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ui/base/layout.h" |
| |
| #include "ui/display/display.h" |
| #include "ui/display/screen.h" |
| |
| namespace ui { |
| |
| float GetScaleFactorForNativeView(gfx::NativeView view) { |
| // A number of unit tests do not setup the screen. |
| if (!display::Screen::GetScreen()) |
| return 1.0f; |
| display::Display display = |
| display::Screen::GetScreen()->GetDisplayNearestView(view); |
| |
| // GetDisplayNearestView() may return null Display if the |view| is not shown |
| // on the screen and there is no primary display. In that case use scale |
| // factor 1.0. |
| if (!display.is_valid()) |
| return 1.0f; |
| |
| return display.device_scale_factor(); |
| } |
| |
| } // namespace ui |
