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