1 // Copyright (c) 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 "remoting/host/screen_resolution.h"
6
7 #include <stdint.h>
8
9 #include <algorithm>
10 #include <limits>
11
12 #include "base/check_op.h"
13
14 namespace remoting {
15
ScreenResolution()16 ScreenResolution::ScreenResolution()
17 : dimensions_(webrtc::DesktopSize(0, 0)),
18 dpi_(webrtc::DesktopVector(0, 0)) {
19 }
20
ScreenResolution(const webrtc::DesktopSize & dimensions,const webrtc::DesktopVector & dpi)21 ScreenResolution::ScreenResolution(const webrtc::DesktopSize& dimensions,
22 const webrtc::DesktopVector& dpi)
23 : dimensions_(dimensions),
24 dpi_(dpi) {
25 // Check that dimensions are not negative.
26 DCHECK(!dimensions.is_empty() || dimensions.equals(webrtc::DesktopSize()));
27 DCHECK_GE(dpi.x(), 0);
28 DCHECK_GE(dpi.y(), 0);
29 }
30
ScaleDimensionsToDpi(const webrtc::DesktopVector & new_dpi) const31 webrtc::DesktopSize ScreenResolution::ScaleDimensionsToDpi(
32 const webrtc::DesktopVector& new_dpi) const {
33 int64_t width = dimensions_.width();
34 int64_t height = dimensions_.height();
35
36 // Scale the screen dimensions to new DPI.
37 width = std::min(width * new_dpi.x() / dpi_.x(),
38 static_cast<int64_t>(std::numeric_limits<int32_t>::max()));
39 height = std::min(height * new_dpi.y() / dpi_.y(),
40 static_cast<int64_t>(std::numeric_limits<int32_t>::max()));
41 return webrtc::DesktopSize(width, height);
42 }
43
IsEmpty() const44 bool ScreenResolution::IsEmpty() const {
45 return dimensions_.is_empty() || dpi_.is_zero();
46 }
47
Equals(const ScreenResolution & other) const48 bool ScreenResolution::Equals(const ScreenResolution& other) const {
49 return dimensions_.equals(other.dimensions()) && dpi_.equals(other.dpi());
50 }
51
52 } // namespace remoting
53