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/*
* 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 <Cocoa/Cocoa.h>
#include <math.h>
#include <algorithm>
#include "rtc_base/checks.h"
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);
display_config.dip_to_pixel_scale = [screen backingScaleFactor];
NSRect ns_pixel_bounds = [screen convertRectToBacking:ns_bounds];
display_config.pixel_bounds = NSRectToDesktopRect(ns_pixel_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
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