1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/desktop_capture/mac/desktop_configuration.h"
#include <math.h>
#include <algorithm>
#include <Cocoa/Cocoa.h>
#include "rtc_base/checks.h"
#if !defined(MAC_OS_X_VERSION_10_7) || \
MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
@interface NSScreen (LionAPI)
- (CGFloat)backingScaleFactor;
- (NSRect)convertRectToBacking:(NSRect)aRect;
@end
#endif // MAC_OS_X_VERSION_10_7
namespace webrtc {
namespace {
DesktopRect NSRectToDesktopRect(const NSRect& ns_rect) {
return DesktopRect::MakeLTRB(
static_cast<int>(floor(ns_rect.origin.x)),
static_cast<int>(floor(ns_rect.origin.y)),
static_cast<int>(ceil(ns_rect.origin.x + ns_rect.size.width)),
static_cast<int>(ceil(ns_rect.origin.y + ns_rect.size.height)));
}
// Inverts the position of `rect` from bottom-up coordinates to top-down,
// relative to `bounds`.
void InvertRectYOrigin(const DesktopRect& bounds,
DesktopRect* rect) {
RTC_DCHECK_EQ(bounds.top(), 0);
*rect = DesktopRect::MakeXYWH(
rect->left(), bounds.bottom() - rect->bottom(),
rect->width(), rect->height());
}
MacDisplayConfiguration GetConfigurationForScreen(NSScreen* screen) {
MacDisplayConfiguration display_config;
// Fetch the NSScreenNumber, which is also the CGDirectDisplayID.
NSDictionary* device_description = [screen deviceDescription];
display_config.id = static_cast<CGDirectDisplayID>(
[[device_description objectForKey:@"NSScreenNumber"] intValue]);
// Determine the display's logical & physical dimensions.
NSRect ns_bounds = [screen frame];
display_config.bounds = NSRectToDesktopRect(ns_bounds);
// If the host is running Mac OS X 10.7+ or later, query the scaling factor
// between logical and physical (aka "backing") pixels, otherwise assume 1:1.
if ([screen respondsToSelector:@selector(backingScaleFactor)] &&
[screen respondsToSelector:@selector(convertRectToBacking:)]) {
display_config.dip_to_pixel_scale = [screen backingScaleFactor];
NSRect ns_pixel_bounds = [screen convertRectToBacking: ns_bounds];
display_config.pixel_bounds = NSRectToDesktopRect(ns_pixel_bounds);
} else {
display_config.pixel_bounds = display_config.bounds;
}
// Determine if the display is built-in or external.
display_config.is_builtin = CGDisplayIsBuiltin(display_config.id);
return display_config;
}
} // namespace
MacDisplayConfiguration::MacDisplayConfiguration() = default;
MacDisplayConfiguration::MacDisplayConfiguration(
const MacDisplayConfiguration& other) = default;
MacDisplayConfiguration::MacDisplayConfiguration(
MacDisplayConfiguration&& other) = default;
MacDisplayConfiguration::~MacDisplayConfiguration() = default;
MacDisplayConfiguration& MacDisplayConfiguration::operator=(
const MacDisplayConfiguration& other) = default;
MacDisplayConfiguration& MacDisplayConfiguration::operator=(
MacDisplayConfiguration&& other) = default;
MacDesktopConfiguration::MacDesktopConfiguration() = default;
MacDesktopConfiguration::MacDesktopConfiguration(
const MacDesktopConfiguration& other) = default;
MacDesktopConfiguration::MacDesktopConfiguration(
MacDesktopConfiguration&& other) = default;
MacDesktopConfiguration::~MacDesktopConfiguration() = default;
MacDesktopConfiguration& MacDesktopConfiguration::operator=(
const MacDesktopConfiguration& other) = default;
MacDesktopConfiguration& MacDesktopConfiguration::operator=(
MacDesktopConfiguration&& other) = default;
// static
MacDesktopConfiguration MacDesktopConfiguration::GetCurrent(Origin origin) {
MacDesktopConfiguration desktop_config;
NSArray* screens = [NSScreen screens];
RTC_DCHECK(screens);
// Iterator over the monitors, adding the primary monitor and monitors whose
// DPI match that of the primary monitor.
for (NSUInteger i = 0; i < [screens count]; ++i) {
MacDisplayConfiguration display_config =
GetConfigurationForScreen([screens objectAtIndex: i]);
if (i == 0)
desktop_config.dip_to_pixel_scale = display_config.dip_to_pixel_scale;
// Cocoa uses bottom-up coordinates, so if the caller wants top-down then
// we need to invert the positions of secondary monitors relative to the
// primary one (the primary monitor's position is (0,0) in both systems).
if (i > 0 && origin == TopLeftOrigin) {
InvertRectYOrigin(desktop_config.displays[0].bounds,
&display_config.bounds);
// `display_bounds` is density dependent, so we need to convert the
// primay monitor's position into the secondary monitor's density context.
float scaling_factor = display_config.dip_to_pixel_scale /
desktop_config.displays[0].dip_to_pixel_scale;
DesktopRect primary_bounds = DesktopRect::MakeLTRB(
desktop_config.displays[0].pixel_bounds.left() * scaling_factor,
desktop_config.displays[0].pixel_bounds.top() * scaling_factor,
desktop_config.displays[0].pixel_bounds.right() * scaling_factor,
desktop_config.displays[0].pixel_bounds.bottom() * scaling_factor);
InvertRectYOrigin(primary_bounds, &display_config.pixel_bounds);
}
// Add the display to the configuration.
desktop_config.displays.push_back(display_config);
// Update the desktop bounds to account for this display, unless the current
// display uses different DPI settings.
if (display_config.dip_to_pixel_scale ==
desktop_config.dip_to_pixel_scale) {
desktop_config.bounds.UnionWith(display_config.bounds);
desktop_config.pixel_bounds.UnionWith(display_config.pixel_bounds);
}
}
return desktop_config;
}
// For convenience of comparing MacDisplayConfigurations in
// MacDesktopConfiguration::Equals.
bool operator==(const MacDisplayConfiguration& left,
const MacDisplayConfiguration& right) {
return left.id == right.id &&
left.bounds.equals(right.bounds) &&
left.pixel_bounds.equals(right.pixel_bounds) &&
left.dip_to_pixel_scale == right.dip_to_pixel_scale;
}
bool MacDesktopConfiguration::Equals(const MacDesktopConfiguration& other) {
return bounds.equals(other.bounds) &&
pixel_bounds.equals(other.pixel_bounds) &&
dip_to_pixel_scale == other.dip_to_pixel_scale &&
displays == other.displays;
}
const MacDisplayConfiguration*
MacDesktopConfiguration::FindDisplayConfigurationById(
CGDirectDisplayID id) {
bool is_builtin = CGDisplayIsBuiltin(id);
for (MacDisplayConfigurations::const_iterator it = displays.begin();
it != displays.end(); ++it) {
// The MBP having both discrete and integrated graphic cards will do
// automate graphics switching by default. When it switches from discrete to
// integrated one, the current display ID of the built-in display will
// change and this will cause screen capture stops.
// So make screen capture of built-in display continuing even if its display
// ID is changed.
if ((is_builtin && it->is_builtin) || (!is_builtin && it->id == id)) return &(*it);
}
return NULL;
}
} // namespace webrtc
|
