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screen_mac.mm
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/screen.h"
#import <AppKit/AppKit.h>
#import <ApplicationServices/ApplicationServices.h>
#import <Cocoa/Cocoa.h>
#include <stdint.h>
#include <map>
#include <memory>
#include "base/bind.h"
#include "base/logging.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_nsobject.h"
#include "base/mac/sdk_forward_declarations.h"
#include "base/stl_util.h"
#include "base/timer/timer.h"
#include "base/trace_event/trace_event.h"
#include "ui/display/display.h"
#include "ui/display/display_change_notifier.h"
#include "ui/display/mac/display_link_mac.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/icc_profile.h"
#include "ui/gfx/mac/coordinate_conversion.h"
extern "C" {
Boolean CGDisplayUsesForceToGray(void);
}
namespace display {
namespace {
NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) {
// Default to the monitor with the current keyboard focus, in case
// |match_rect| is not on any screen at all.
NSScreen* max_screen = [NSScreen mainScreen];
int max_area = 0;
for (NSScreen* screen in [NSScreen screens]) {
gfx::Rect monitor_area = gfx::ScreenRectFromNSRect([screen frame]);
gfx::Rect intersection = gfx::IntersectRects(monitor_area, match_rect);
int area = intersection.width() * intersection.height();
if (area > max_area) {
max_area = area;
max_screen = screen;
}
}
return max_screen;
}
Display BuildDisplayForScreen(NSScreen* screen) {
TRACE_EVENT0("ui", "BuildDisplayForScreen");
NSRect frame = [screen frame];
CGDirectDisplayID display_id =
[[screen deviceDescription][@"NSScreenNumber"] unsignedIntValue];
Display display(display_id, gfx::Rect(NSRectToCGRect(frame)));
NSRect visible_frame = [screen visibleFrame];
NSScreen* primary = [[NSScreen screens] firstObject];
// Convert work area's coordinate systems.
if ([screen isEqual:primary]) {
gfx::Rect work_area = gfx::Rect(NSRectToCGRect(visible_frame));
work_area.set_y(frame.size.height - visible_frame.origin.y -
visible_frame.size.height);
display.set_work_area(work_area);
} else {
display.set_bounds(gfx::ScreenRectFromNSRect(frame));
display.set_work_area(gfx::ScreenRectFromNSRect(visible_frame));
}
// Compute device scale factor
CGFloat scale = [screen backingScaleFactor];
if (Display::HasForceDeviceScaleFactor())
scale = Display::GetForcedDeviceScaleFactor();
display.set_device_scale_factor(scale);
// Examine the presence of HDR.
bool enable_hdr = false;
if (@available(macOS 10.15, *)) {
if ([screen maximumPotentialExtendedDynamicRangeColorComponentValue] >
1.0) {
enable_hdr = true;
}
}
// Compute DisplayColorSpaces.
gfx::ICCProfile icc_profile;
{
CGColorSpaceRef cg_color_space = [[screen colorSpace] CGColorSpace];
if (cg_color_space) {
base::ScopedCFTypeRef<CFDataRef> cf_icc_profile(
CGColorSpaceCopyICCProfile(cg_color_space));
if (cf_icc_profile) {
icc_profile = gfx::ICCProfile::FromData(
CFDataGetBytePtr(cf_icc_profile), CFDataGetLength(cf_icc_profile));
}
}
}
gfx::DisplayColorSpaces display_color_spaces(icc_profile.GetColorSpace(),
gfx::BufferFormat::RGBA_8888);
if (Display::HasForceDisplayColorProfile()) {
if (Display::HasEnsureForcedColorProfile()) {
if (display_color_spaces != display.color_spaces()) {
LOG(FATAL) << "The display's color space does not match the color "
"space that was forced by the command line. This will "
"cause pixel tests to fail.";
}
}
} else {
if (enable_hdr) {
bool needs_alpha_values[] = {true, false};
for (const auto& needs_alpha : needs_alpha_values) {
display_color_spaces.SetOutputColorSpaceAndBufferFormat(
gfx::ContentColorUsage::kHDR, needs_alpha,
gfx::ColorSpace::CreateExtendedSRGB(), gfx::BufferFormat::RGBA_F16);
}
}
display.set_color_spaces(display_color_spaces);
}
if (enable_hdr) {
display.set_color_depth(Display::kHDR10BitsPerPixel);
display.set_depth_per_component(Display::kHDR10BitsPerComponent);
} else {
display.set_color_depth(Display::kDefaultBitsPerPixel);
display.set_depth_per_component(Display::kDefaultBitsPerComponent);
}
display.set_is_monochrome(CGDisplayUsesForceToGray());
if (auto display_link = ui::DisplayLinkMac::GetForDisplay(display_id))
display.set_display_frequency(display_link->GetRefreshRate());
// CGDisplayRotation returns a double. Display::SetRotationAsDegree will
// handle the unexpected situations were the angle is not a multiple of 90.
display.SetRotationAsDegree(static_cast<int>(CGDisplayRotation(display_id)));
// TODO(crbug.com/1078903): Support multiple internal displays.
if (CGDisplayIsBuiltin(display_id))
Display::SetInternalDisplayId(display_id);
return display;
}
Display BuildPrimaryDisplay() {
return BuildDisplayForScreen([[NSScreen screens] firstObject]);
}
std::vector<Display> BuildDisplaysFromQuartz() {
TRACE_EVENT0("ui", "BuildDisplaysFromQuartz");
// Don't just return all online displays. This would include displays
// that mirror other displays, which are not desired in this list. It's
// tempting to use the count returned by CGGetActiveDisplayList, but active
// displays exclude sleeping displays, and those are desired.
// It would be ridiculous to have this many displays connected, but
// CGDirectDisplayID is just an integer, so supporting up to this many
// doesn't hurt.
CGDirectDisplayID online_displays[1024];
CGDisplayCount online_display_count = 0;
if (CGGetOnlineDisplayList(base::size(online_displays), online_displays,
&online_display_count) != kCGErrorSuccess) {
return std::vector<Display>(1, BuildPrimaryDisplay());
}
typedef std::map<int64_t, NSScreen*> ScreenIdsToScreensMap;
ScreenIdsToScreensMap screen_ids_to_screens;
for (NSScreen* screen in [NSScreen screens]) {
NSDictionary* screen_device_description = [screen deviceDescription];
int64_t screen_id =
[screen_device_description[@"NSScreenNumber"] unsignedIntValue];
screen_ids_to_screens[screen_id] = screen;
}
std::vector<Display> displays;
for (CGDisplayCount online_display_index = 0;
online_display_index < online_display_count; ++online_display_index) {
CGDirectDisplayID online_display = online_displays[online_display_index];
if (CGDisplayMirrorsDisplay(online_display) == kCGNullDirectDisplay) {
// If this display doesn't mirror any other, include it in the list.
// The primary display in a mirrored set will be counted, but those that
// mirror it will not be.
ScreenIdsToScreensMap::iterator foundScreen =
screen_ids_to_screens.find(online_display);
if (foundScreen != screen_ids_to_screens.end()) {
displays.push_back(BuildDisplayForScreen(foundScreen->second));
}
}
}
return displays.empty() ? std::vector<Display>(1, BuildPrimaryDisplay())
: displays;
}
// Returns the minimum Manhattan distance from |point| to corners of |screen|
// frame.
CGFloat GetMinimumDistanceToCorner(const NSPoint& point, NSScreen* screen) {
NSRect frame = [screen frame];
CGFloat distance =
fabs(point.x - NSMinX(frame)) + fabs(point.y - NSMinY(frame));
distance = std::min(
distance, fabs(point.x - NSMaxX(frame)) + fabs(point.y - NSMinY(frame)));
distance = std::min(
distance, fabs(point.x - NSMinX(frame)) + fabs(point.y - NSMaxY(frame)));
distance = std::min(
distance, fabs(point.x - NSMaxX(frame)) + fabs(point.y - NSMaxY(frame)));
return distance;
}
class ScreenMac : public Screen {
public:
ScreenMac() {
displays_ = BuildDisplaysFromQuartz();
CGDisplayRegisterReconfigurationCallback(
ScreenMac::DisplayReconfigurationCallBack, this);
auto update_block = ^(NSNotification* notification) {
OnNSScreensMayHaveChanged();
};
NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
screen_color_change_observer_.reset(
[[center addObserverForName:NSScreenColorSpaceDidChangeNotification
object:nil
queue:nil
usingBlock:update_block] retain]);
screen_params_change_observer_.reset([[center
addObserverForName:NSApplicationDidChangeScreenParametersNotification
object:nil
queue:nil
usingBlock:update_block] retain]);
}
~ScreenMac() override {
NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
[center removeObserver:screen_color_change_observer_];
[center removeObserver:screen_params_change_observer_];
CGDisplayRemoveReconfigurationCallback(
ScreenMac::DisplayReconfigurationCallBack, this);
}
gfx::Point GetCursorScreenPoint() override {
// Flip coordinates to gfx (0,0 in top-left corner) using primary screen.
return gfx::ScreenPointFromNSPoint([NSEvent mouseLocation]);
}
bool IsWindowUnderCursor(gfx::NativeWindow native_window) override {
NSWindow* window = native_window.GetNativeNSWindow();
return [NSWindow windowNumberAtPoint:[NSEvent mouseLocation]
belowWindowWithWindowNumber:0] == [window windowNumber];
}
gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
NOTIMPLEMENTED();
return gfx::NativeWindow();
}
gfx::NativeWindow GetLocalProcessWindowAtPoint(
const gfx::Point& point,
const std::set<gfx::NativeWindow>& ignore) override {
const NSPoint ns_point = gfx::ScreenPointToNSPoint(point);
// Note: [NSApp orderedWindows] doesn't include NSPanels.
for (NSWindow* window : [NSApp orderedWindows]) {
if (ignore.count(window))
continue;
if (![window isOnActiveSpace])
continue;
// NativeWidgetMac::Close() calls -orderOut: on NSWindows before actually
// closing them.
if (![window isVisible])
continue;
if (NSPointInRect(ns_point, [window frame]))
return window;
}
return nil;
}
int GetNumDisplays() const override { return GetAllDisplays().size(); }
const std::vector<Display>& GetAllDisplays() const override {
return displays_;
}
Display GetDisplayNearestWindow(
gfx::NativeWindow native_window) const override {
if (displays_.size() == 1)
return displays_[0];
NSWindow* window = native_window.GetNativeNSWindow();
if (!window)
return GetPrimaryDisplay();
// Note the following line calls -[NSWindow
// _bestScreenBySpaceAssignmentOrGeometry] which is quite expensive and
// performs IPC with the window server process.
NSScreen* match_screen = [window screen];
if (!match_screen)
return GetPrimaryDisplay();
return GetCachedDisplayForScreen(match_screen);
}
Display GetDisplayNearestView(gfx::NativeView native_view) const override {
NSView* view = native_view.GetNativeNSView();
NSWindow* window = [view window];
if (!window)
return GetPrimaryDisplay();
return GetDisplayNearestWindow(window);
}
Display GetDisplayNearestPoint(const gfx::Point& point) const override {
NSArray* screens = [NSScreen screens];
if ([screens count] <= 1)
return GetPrimaryDisplay();
NSPoint ns_point = NSPointFromCGPoint(point.ToCGPoint());
NSScreen* primary = screens[0];
ns_point.y = NSMaxY([primary frame]) - ns_point.y;
for (NSScreen* screen in screens) {
if (NSMouseInRect(ns_point, [screen frame], NO))
return GetCachedDisplayForScreen(screen);
}
NSScreen* nearest_screen = primary;
CGFloat min_distance = CGFLOAT_MAX;
for (NSScreen* screen in screens) {
CGFloat distance = GetMinimumDistanceToCorner(ns_point, screen);
if (distance < min_distance) {
min_distance = distance;
nearest_screen = screen;
}
}
return GetCachedDisplayForScreen(nearest_screen);
}
// Returns the display that most closely intersects the provided bounds.
Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
NSScreen* match_screen = GetMatchingScreen(match_rect);
return GetCachedDisplayForScreen(match_screen);
}
// Returns the primary display.
Display GetPrimaryDisplay() const override {
// Primary display is defined as the display with the menubar,
// which is always at index 0.
NSScreen* primary = [[NSScreen screens] firstObject];
Display display = GetCachedDisplayForScreen(primary);
return display;
}
void AddObserver(DisplayObserver* observer) override {
change_notifier_.AddObserver(observer);
}
void RemoveObserver(DisplayObserver* observer) override {
change_notifier_.RemoveObserver(observer);
}
static void DisplayReconfigurationCallBack(CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void* userInfo) {
ScreenMac* screen_mac = static_cast<ScreenMac*>(userInfo);
screen_mac->OnNSScreensMayHaveChanged();
}
private:
Display GetCachedDisplayForScreen(NSScreen* screen) const {
const CGDirectDisplayID display_id =
[[screen deviceDescription][@"NSScreenNumber"] unsignedIntValue];
for (const Display& display : displays_) {
if (display_id == display.id())
return display;
}
// In theory, this should not be reached, but in practice, on Catalina, it
// has been observed that -[NSScreen screens] changes before any
// notifications are received.
// https://crbug.com/1021340.
DLOG(ERROR) << "Value of -[NSScreen screens] changed before notification.";
return BuildDisplayForScreen(screen);
}
void OnNSScreensMayHaveChanged() {
TRACE_EVENT0("ui", "OnNSScreensMayHaveChanged");
auto new_displays = BuildDisplaysFromQuartz();
if (displays_ == new_displays)
return;
auto old_displays = std::move(displays_);
displays_ = std::move(new_displays);
change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
}
// The displays currently attached to the device. Updated by
// OnNSScreensMayHaveChanged.
std::vector<Display> displays_;
// The observers notified by NSScreenColorSpaceDidChangeNotification and
// NSApplicationDidChangeScreenParametersNotification.
base::scoped_nsobject<id> screen_color_change_observer_;
base::scoped_nsobject<id> screen_params_change_observer_;
DisplayChangeNotifier change_notifier_;
DISALLOW_COPY_AND_ASSIGN(ScreenMac);
};
} // namespace
// static
gfx::NativeWindow Screen::GetWindowForView(gfx::NativeView native_view) {
#if !defined(USE_AURA)
NSView* view = native_view.GetNativeNSView();
return [view window];
#else
gfx::NativeWindow window = nil;
return window;
#endif
}
#if !defined(USE_AURA)
Screen* CreateNativeScreen() {
return new ScreenMac;
}
#endif
} // namespace display