screen_resolution.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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 <algorithm>
8#include <limits>
9
10namespace remoting {
11
12ScreenResolution::ScreenResolution()
13    : dimensions_(SkISize::Make(0, 0)),
14      dpi_(SkIPoint::Make(0, 0)) {
15}
16
17ScreenResolution::ScreenResolution(const SkISize& dimensions,
18                                   const SkIPoint& dpi)
19    : dimensions_(dimensions),
20      dpi_(dpi) {
21}
22
23SkISize ScreenResolution::ScaleDimensionsToDpi(const SkIPoint& new_dpi) const {
24  int64 width = dimensions_.width();
25  int64 height = dimensions_.height();
26
27  // Scale the screen dimensions to new DPI.
28  width = std::min(width * new_dpi.x() / dpi_.x(),
29                   static_cast<int64>(std::numeric_limits<int32>::max()));
30  height = std::min(height * new_dpi.y() / dpi_.y(),
31                    static_cast<int64>(std::numeric_limits<int32>::max()));
32  return SkISize::Make(static_cast<int32>(width), static_cast<int32>(height));
33}
34
35bool ScreenResolution::IsEmpty() const {
36  return dimensions_.isEmpty() || dpi_.x() <= 0 || dpi_.y() <= 0;
37}
38
39bool ScreenResolution::IsValid() const {
40  return !IsEmpty() || dimensions_.isZero();
41}
42
43}  // namespace remoting
44