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5.13.2: qcocoascreen original

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kleuter 2019-11-29 08:39:32 +01:00
parent ea9ad9fff1
commit ad520af861
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5.13.2/qtbase/src/plugins/platforms/cocoa/qcocoascreen.h Normal file
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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QCOCOASCREEN_H
#define QCOCOASCREEN_H
#include <AppKit/AppKit.h>
#include "qcocoacursor.h"
#include <qpa/qplatformintegration.h>
QT_BEGIN_NAMESPACE
class QCocoaIntegration;
class QCocoaScreen : public QPlatformScreen
{
public:
static void initializeScreens();
static void cleanupScreens();
~QCocoaScreen();
// ----------------------------------------------------
// Virtual methods overridden from QPlatformScreen
QPixmap grabWindow(WId window, int x, int y, int width, int height) const override;
QRect geometry() const override { return m_geometry; }
QRect availableGeometry() const override { return m_availableGeometry; }
int depth() const override { return m_depth; }
QImage::Format format() const override { return m_format; }
qreal devicePixelRatio() const override { return m_devicePixelRatio; }
QSizeF physicalSize() const override { return m_physicalSize; }
QDpi logicalDpi() const override { return m_logicalDpi; }
qreal refreshRate() const override { return m_refreshRate; }
QString name() const override { return m_name; }
QPlatformCursor *cursor() const override { return m_cursor; }
QWindow *topLevelAt(const QPoint &point) const override;
QList<QPlatformScreen *> virtualSiblings() const override;
QPlatformScreen::SubpixelAntialiasingType subpixelAntialiasingTypeHint() const override;
// ----------------------------------------------------
NSScreen *nativeScreen() const;
void updateProperties();
void requestUpdate();
void deliverUpdateRequests();
bool isRunningDisplayLink() const;
static QCocoaScreen *primaryScreen();
static QCocoaScreen *get(NSScreen *nsScreen);
static QCocoaScreen *get(CGDirectDisplayID displayId);
static CGPoint mapToNative(const QPointF &pos, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
static CGRect mapToNative(const QRectF &rect, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
static QPointF mapFromNative(CGPoint pos, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
static QRectF mapFromNative(CGRect rect, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
private:
QCocoaScreen(CGDirectDisplayID displayId);
static void add(CGDirectDisplayID displayId);
void remove();
CGDirectDisplayID m_displayId = 0;
QRect m_geometry;
QRect m_availableGeometry;
QDpi m_logicalDpi;
qreal m_refreshRate;
int m_depth;
QString m_name;
QImage::Format m_format;
QSizeF m_physicalSize;
QCocoaCursor *m_cursor;
qreal m_devicePixelRatio;
CVDisplayLinkRef m_displayLink = nullptr;
dispatch_source_t m_displayLinkSource = nullptr;
QAtomicInt m_pendingUpdates;
friend QDebug operator<<(QDebug debug, const QCocoaScreen *screen);
};
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug debug, const QCocoaScreen *screen);
#endif
QT_END_NAMESPACE
@interface NSScreen (QtExtras)
@property(readonly) CGDirectDisplayID qt_displayId;
@end
#endif // QCOCOASCREEN_H

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5.13.2/qtbase/src/plugins/platforms/cocoa/qcocoascreen.mm Normal file
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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcocoascreen.h"
#include "qcocoawindow.h"
#include "qcocoahelpers.h"
#include "qcocoaintegration.h"
#include <QtCore/qcoreapplication.h>
#include <QtGui/private/qcoregraphics_p.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <QtGui/private/qwindow_p.h>
#include <QtCore/private/qeventdispatcher_cf_p.h>
QT_BEGIN_NAMESPACE
void QCocoaScreen::initializeScreens()
{
uint32_t displayCount = 0;
if (CGGetActiveDisplayList(0, nullptr, &displayCount) != kCGErrorSuccess)
qFatal("Failed to get number of active displays");
CGDirectDisplayID activeDisplays[displayCount];
if (CGGetActiveDisplayList(displayCount, &activeDisplays[0], &displayCount) != kCGErrorSuccess)
qFatal("Failed to get active displays");
for (CGDirectDisplayID displayId : activeDisplays)
QCocoaScreen::add(displayId);
CGDisplayRegisterReconfigurationCallback([](CGDirectDisplayID displayId, CGDisplayChangeSummaryFlags flags, void *userInfo) {
if (flags & kCGDisplayBeginConfigurationFlag)
return; // Wait for changes to apply
Q_UNUSED(userInfo);
QCocoaScreen *cocoaScreen = QCocoaScreen::get(displayId);
if ((flags & kCGDisplayAddFlag) || !cocoaScreen) {
if (!CGDisplayIsActive(displayId)) {
qCDebug(lcQpaScreen) << "Not adding inactive display" << displayId;
return; // Will be added when activated
}
QCocoaScreen::add(displayId);
} else if ((flags & kCGDisplayRemoveFlag) || !CGDisplayIsActive(displayId)) {
cocoaScreen->remove();
} else {
// Detect changes to the primary screen immediately, instead of
// waiting for a display reconfigure with kCGDisplaySetMainFlag.
// This ensures that any property updates to the other screens
// will be in reference to the correct primary screen.
QCocoaScreen *mainDisplay = QCocoaScreen::get(CGMainDisplayID());
if (QGuiApplication::primaryScreen()->handle() != mainDisplay) {
mainDisplay->updateProperties();
qCInfo(lcQpaScreen) << "Primary screen changed to" << mainDisplay;
QWindowSystemInterface::handlePrimaryScreenChanged(mainDisplay);
}
if (cocoaScreen == mainDisplay)
return; // Already reconfigured
cocoaScreen->updateProperties();
qCInfo(lcQpaScreen) << "Reconfigured" << cocoaScreen;
}
}, nullptr);
}
void QCocoaScreen::add(CGDirectDisplayID displayId)
{
QCocoaScreen *cocoaScreen = new QCocoaScreen(displayId);
qCInfo(lcQpaScreen) << "Adding" << cocoaScreen;
QWindowSystemInterface::handleScreenAdded(cocoaScreen, CGDisplayIsMain(displayId));
}
QCocoaScreen::QCocoaScreen(CGDirectDisplayID displayId)
: QPlatformScreen(), m_displayId(displayId)
{
updateProperties();
m_cursor = new QCocoaCursor;
}
void QCocoaScreen::cleanupScreens()
{
// Remove screens in reverse order to avoid crash in case of multiple screens
for (QScreen *screen : backwards(QGuiApplication::screens()))
static_cast<QCocoaScreen*>(screen->handle())->remove();
}
void QCocoaScreen::remove()
{
m_displayId = 0; // Prevent stale references during removal
// This may result in the application responding to QGuiApplication::screenRemoved
// by moving the window to another screen, either by setGeometry, or by setScreen.
// If the window isn't moved by the application, Qt will as a fallback move it to
// the primary screen via setScreen. Due to the way setScreen works, this won't
// actually recreate the window on the new screen, it will just assign the new
// QScreen to the window. The associated NSWindow will have an NSScreen determined
// by AppKit. AppKit will then move the window to another screen by changing the
// geometry, and we will get a callback in QCocoaWindow::windowDidMove and then
// QCocoaWindow::windowDidChangeScreen. At that point the window will appear to have
// already changed its screen, but that's only true if comparing the Qt screens,
// not when comparing the NSScreens.
QWindowSystemInterface::handleScreenRemoved(this);
}
QCocoaScreen::~QCocoaScreen()
{
Q_ASSERT_X(!screen(), "QCocoaScreen", "QScreen should be deleted first");
delete m_cursor;
CVDisplayLinkRelease(m_displayLink);
if (m_displayLinkSource)
dispatch_release(m_displayLinkSource);
}
static QString displayName(CGDirectDisplayID displayID)
{
QIOType<io_iterator_t> iterator;
if (IOServiceGetMatchingServices(kIOMasterPortDefault,
IOServiceMatching("IODisplayConnect"), &iterator))
return QString();
QIOType<io_service_t> display;
while ((display = IOIteratorNext(iterator)) != 0)
{
NSDictionary *info = [(__bridge NSDictionary*)IODisplayCreateInfoDictionary(
display, kIODisplayOnlyPreferredName) autorelease];
if ([[info objectForKey:@kDisplayVendorID] longValue] != CGDisplayVendorNumber(displayID))
continue;
if ([[info objectForKey:@kDisplayProductID] longValue] != CGDisplayModelNumber(displayID))
continue;
if ([[info objectForKey:@kDisplaySerialNumber] longValue] != CGDisplaySerialNumber(displayID))
continue;
NSDictionary *localizedNames = [info objectForKey:@kDisplayProductName];
if (![localizedNames count])
break; // Correct screen, but no name in dictionary
return QString::fromNSString([localizedNames objectForKey:[[localizedNames allKeys] objectAtIndex:0]]);
}
return QString();
}
void QCocoaScreen::updateProperties()
{
Q_ASSERT(m_displayId);
const QRect previousGeometry = m_geometry;
const QRect previousAvailableGeometry = m_availableGeometry;
const QDpi previousLogicalDpi = m_logicalDpi;
const qreal previousRefreshRate = m_refreshRate;
// Some properties are only available via NSScreen
NSScreen *nsScreen = nativeScreen();
Q_ASSERT(nsScreen);
// The reference screen for the geometry is always the primary screen
QRectF primaryScreenGeometry = QRectF::fromCGRect(CGDisplayBounds(CGMainDisplayID()));
m_geometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.frame), primaryScreenGeometry).toRect();
m_availableGeometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.visibleFrame), primaryScreenGeometry).toRect();
m_devicePixelRatio = nsScreen.backingScaleFactor;
m_format = QImage::Format_RGB32;
m_depth = NSBitsPerPixelFromDepth(nsScreen.depth);
CGSize size = CGDisplayScreenSize(m_displayId);
m_physicalSize = QSizeF(size.width, size.height);
m_logicalDpi.first = 72;
m_logicalDpi.second = 72;
QCFType<CGDisplayModeRef> displayMode = CGDisplayCopyDisplayMode(m_displayId);
float refresh = CGDisplayModeGetRefreshRate(displayMode);
m_refreshRate = refresh > 0 ? refresh : 60.0;
m_name = displayName(m_displayId);
const bool didChangeGeometry = m_geometry != previousGeometry || m_availableGeometry != previousAvailableGeometry;
if (didChangeGeometry)
QWindowSystemInterface::handleScreenGeometryChange(screen(), geometry(), availableGeometry());
if (m_logicalDpi != previousLogicalDpi)
QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(screen(), m_logicalDpi.first, m_logicalDpi.second);
if (m_refreshRate != previousRefreshRate)
QWindowSystemInterface::handleScreenRefreshRateChange(screen(), m_refreshRate);
}
// ----------------------- Display link -----------------------
Q_LOGGING_CATEGORY(lcQpaScreenUpdates, "qt.qpa.screen.updates", QtCriticalMsg);
void QCocoaScreen::requestUpdate()
{
Q_ASSERT(m_displayId);
if (!m_displayLink) {
CVDisplayLinkCreateWithCGDisplay(m_displayId, &m_displayLink);
CVDisplayLinkSetOutputCallback(m_displayLink, [](CVDisplayLinkRef, const CVTimeStamp*,
const CVTimeStamp*, CVOptionFlags, CVOptionFlags*, void* displayLinkContext) -> int {
// FIXME: It would be nice if update requests would include timing info
static_cast<QCocoaScreen*>(displayLinkContext)->deliverUpdateRequests();
return kCVReturnSuccess;
}, this);
qCDebug(lcQpaScreenUpdates) << "Display link created for" << this;
// During live window resizing -[NSWindow _resizeWithEvent:] will spin a local event loop
// in event-tracking mode, dequeuing only the mouse drag events needed to update the window's
// frame. It will repeatedly spin this loop until no longer receiving any mouse drag events,
// and will then update the frame (effectively coalescing/compressing the events). Unfortunately
// the events are pulled out using -[NSApplication nextEventMatchingEventMask:untilDate:inMode:dequeue:]
// which internally uses CFRunLoopRunSpecific, so the event loop will also process GCD queues and other
// runloop sources that have been added to the tracking mode. This includes the GCD display-link
// source that we use to marshal the display-link callback over to the main thread. If the
// subsequent delivery of the update-request on the main thread stalls due to inefficient
// user code, the NSEventThread will have had time to deliver additional mouse drag events,
// and the logic in -[NSWindow _resizeWithEvent:] will keep on compressing events and never
// get to the point of actually updating the window frame, making it seem like the window
// is stuck in its original size. Only when the user stops moving their mouse, and the event
// queue is completely drained of drag events, will the window frame be updated.
// By keeping an event tap listening for drag events, registered as a version 1 runloop source,
// we prevent the GCD source from being prioritized, giving the resize logic enough time
// to finish coalescing the events. This is incidental, but conveniently gives us the behavior
// we are looking for, interleaving display-link updates and resize events.
static CFMachPortRef eventTap = []() {
CFMachPortRef eventTap = CGEventTapCreateForPid(getpid(), kCGTailAppendEventTap,
kCGEventTapOptionListenOnly, NSEventMaskLeftMouseDragged,
[](CGEventTapProxy, CGEventType type, CGEventRef event, void *) -> CGEventRef {
if (type == kCGEventTapDisabledByTimeout)
qCWarning(lcQpaScreenUpdates) << "Event tap disabled due to timeout!";
return event; // Listen only tap, so what we return doesn't really matter
}, nullptr);
CGEventTapEnable(eventTap, false); // Event taps are normally enabled when created
static CFRunLoopSourceRef runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserverForName:NSWindowWillStartLiveResizeNotification object:nil queue:nil
usingBlock:^(NSNotification *notification) {
qCDebug(lcQpaScreenUpdates) << "Live resize of" << notification.object
<< "started. Enabling event tap";
CGEventTapEnable(eventTap, true);
}];
[center addObserverForName:NSWindowDidEndLiveResizeNotification object:nil queue:nil
usingBlock:^(NSNotification *notification) {
qCDebug(lcQpaScreenUpdates) << "Live resize of" << notification.object
<< "ended. Disabling event tap";
CGEventTapEnable(eventTap, false);
}];
return eventTap;
}();
Q_UNUSED(eventTap);
}
if (!CVDisplayLinkIsRunning(m_displayLink)) {
qCDebug(lcQpaScreenUpdates) << "Starting display link for" << this;
CVDisplayLinkStart(m_displayLink);
}
}
// Helper to allow building up debug output in multiple steps
struct DeferredDebugHelper
{
DeferredDebugHelper(const QLoggingCategory &cat) {
if (cat.isDebugEnabled())
debug = new QDebug(QMessageLogger().debug(cat).nospace());
}
~DeferredDebugHelper() {
flushOutput();
}
void flushOutput() {
if (debug) {
delete debug;
debug = nullptr;
}
}
QDebug *debug = nullptr;
};
#define qDeferredDebug(helper) if (Q_UNLIKELY(helper.debug)) *helper.debug
void QCocoaScreen::deliverUpdateRequests()
{
if (!m_displayId)
return; // Screen removed
QMacAutoReleasePool pool;
// The CVDisplayLink callback is a notification that it's a good time to produce a new frame.
// Since the callback is delivered on a separate thread we have to marshal it over to the
// main thread, as Qt requires update requests to be delivered there. This needs to happen
// asynchronously, as otherwise we may end up deadlocking if the main thread calls back
// into any of the CVDisplayLink APIs.
if (!NSThread.isMainThread) {
// We're explicitly not using the data of the GCD source to track the pending updates,
// as the data isn't reset to 0 until after the event handler, and also doesn't update
// during the event handler, both of which we need to track late frames.
const int pendingUpdates = ++m_pendingUpdates;
DeferredDebugHelper screenUpdates(lcQpaScreenUpdates());
qDeferredDebug(screenUpdates) << "display link callback for screen " << m_displayId;
if (const int framesAheadOfDelivery = pendingUpdates - 1) {
// If we have more than one update pending it means that a previous display link callback
// has not been fully processed on the main thread, either because GCD hasn't delivered
// it on the main thread yet, because the processing of the update request is taking
// too long, or because the update request was deferred due to window live resizing.
qDeferredDebug(screenUpdates) << ", " << framesAheadOfDelivery << " frame(s) ahead";
// We skip the frame completely if we're live-resizing, to not put any extra
// strain on the main thread runloop. Otherwise we assume we should push frames
// as fast as possible, and hopefully the callback will be delivered on the
// main thread just when the previous finished.
if (qt_apple_sharedApplication().keyWindow.inLiveResize) {
qDeferredDebug(screenUpdates) << "; waiting for main thread to catch up";
return;
}
}
qDeferredDebug(screenUpdates) << "; signaling dispatch source";
if (!m_displayLinkSource) {
m_displayLinkSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_DATA_ADD, 0, 0, dispatch_get_main_queue());
dispatch_source_set_event_handler(m_displayLinkSource, ^{
deliverUpdateRequests();
});
dispatch_resume(m_displayLinkSource);
}
dispatch_source_merge_data(m_displayLinkSource, 1);
} else {
DeferredDebugHelper screenUpdates(lcQpaScreenUpdates());
qDeferredDebug(screenUpdates) << "gcd event handler on main thread";
const int pendingUpdates = m_pendingUpdates;
if (pendingUpdates > 1)
qDeferredDebug(screenUpdates) << ", " << (pendingUpdates - 1) << " frame(s) behind display link";
screenUpdates.flushOutput();
bool pauseUpdates = true;
auto windows = QGuiApplication::allWindows();
for (int i = 0; i < windows.size(); ++i) {
QWindow *window = windows.at(i);
auto *platformWindow = static_cast<QCocoaWindow*>(window->handle());
if (!platformWindow)
continue;
if (!platformWindow->hasPendingUpdateRequest())
continue;
if (window->screen() != screen())
continue;
// Skip windows that are not doing update requests via display link
if (!platformWindow->updatesWithDisplayLink())
continue;
platformWindow->deliverUpdateRequest();
// Another update request was triggered, keep the display link running
if (platformWindow->hasPendingUpdateRequest())
pauseUpdates = false;
}
if (pauseUpdates) {
// Pause the display link if there are no pending update requests
qCDebug(lcQpaScreenUpdates) << "Stopping display link for" << this;
CVDisplayLinkStop(m_displayLink);
}
if (const int missedUpdates = m_pendingUpdates.fetchAndStoreRelaxed(0) - pendingUpdates) {
qCWarning(lcQpaScreenUpdates) << "main thread missed" << missedUpdates
<< "update(s) from display link during update request delivery";
}
}
}
bool QCocoaScreen::isRunningDisplayLink() const
{
return m_displayLink && CVDisplayLinkIsRunning(m_displayLink);
}
// -----------------------------------------------------------
QPlatformScreen::SubpixelAntialiasingType QCocoaScreen::subpixelAntialiasingTypeHint() const
{
QPlatformScreen::SubpixelAntialiasingType type = QPlatformScreen::subpixelAntialiasingTypeHint();
if (type == QPlatformScreen::Subpixel_None) {
// Every OSX machine has RGB pixels unless a peculiar or rotated non-Apple screen is attached
type = QPlatformScreen::Subpixel_RGB;
}
return type;
}
QWindow *QCocoaScreen::topLevelAt(const QPoint &point) const
{
NSPoint screenPoint = mapToNative(point);
// Search (hit test) for the top-level window. [NSWidow windowNumberAtPoint:
// belowWindowWithWindowNumber] may return windows that are not interesting
// to Qt. The search iterates until a suitable window or no window is found.
NSInteger topWindowNumber = 0;
QWindow *window = nullptr;
do {
// Get the top-most window, below any previously rejected window.
topWindowNumber = [NSWindow windowNumberAtPoint:screenPoint
belowWindowWithWindowNumber:topWindowNumber];
// Continue the search if the window does not belong to this process.
NSWindow *nsWindow = [NSApp windowWithWindowNumber:topWindowNumber];
if (!nsWindow)
continue;
// Continue the search if the window does not belong to Qt.
if (![nsWindow conformsToProtocol:@protocol(QNSWindowProtocol)])
continue;
QCocoaWindow *cocoaWindow = qnsview_cast(nsWindow.contentView).platformWindow;
if (!cocoaWindow)
continue;
window = cocoaWindow->window();
// Continue the search if the window is not a top-level window.
if (!window->isTopLevel())
continue;
// Stop searching. The current window is the correct window.
break;
} while (topWindowNumber > 0);
return window;
}
QPixmap QCocoaScreen::grabWindow(WId view, int x, int y, int width, int height) const
{
// Determine the grab rect. FIXME: The rect should be bounded by the view's
// geometry, but note that for the pixeltool use case that window will be the
// desktop widget's view, which currently gets resized to fit one screen
// only, since its NSWindow has the NSWindowStyleMaskTitled flag set.
Q_UNUSED(view);
QRect grabRect = QRect(x, y, width, height);
qCDebug(lcQpaScreen) << "input grab rect" << grabRect;
// Find which displays to grab from, or all of them if the grab size is unspecified
const int maxDisplays = 128;
CGDirectDisplayID displays[maxDisplays];
CGDisplayCount displayCount;
CGRect cgRect = (width < 0 || height < 0) ? CGRectInfinite : grabRect.toCGRect();
const CGDisplayErr err = CGGetDisplaysWithRect(cgRect, maxDisplays, displays, &displayCount);
if (err || displayCount == 0)
return QPixmap();
// If the grab size is not specified, set it to be the bounding box of all screens,
if (width < 0 || height < 0) {
QRect windowRect;
for (uint i = 0; i < displayCount; ++i) {
QRect displayBounds = QRectF::fromCGRect(CGDisplayBounds(displays[i])).toRect();
windowRect = windowRect.united(displayBounds);
}
if (grabRect.width() < 0)
grabRect.setWidth(windowRect.width());
if (grabRect.height() < 0)
grabRect.setHeight(windowRect.height());
}
qCDebug(lcQpaScreen) << "final grab rect" << grabRect << "from" << displayCount << "displays";
// Grab images from each display
QVector<QImage> images;
QVector<QRect> destinations;
for (uint i = 0; i < displayCount; ++i) {
auto display = displays[i];
QRect displayBounds = QRectF::fromCGRect(CGDisplayBounds(display)).toRect();
QRect grabBounds = displayBounds.intersected(grabRect);
QRect displayLocalGrabBounds = QRect(QPoint(grabBounds.topLeft() - displayBounds.topLeft()), grabBounds.size());
QImage displayImage = qt_mac_toQImage(QCFType<CGImageRef>(CGDisplayCreateImageForRect(display, displayLocalGrabBounds.toCGRect())));
displayImage.setDevicePixelRatio(displayImage.size().width() / displayLocalGrabBounds.size().width());
images.append(displayImage);
QRect destBounds = QRect(QPoint(grabBounds.topLeft() - grabRect.topLeft()), grabBounds.size());
destinations.append(destBounds);
qCDebug(lcQpaScreen) << "grab display" << i << "global" << grabBounds << "local" << displayLocalGrabBounds
<< "grab image size" << displayImage.size() << "devicePixelRatio" << displayImage.devicePixelRatio();
}
// Determine the highest dpr, which becomes the dpr for the returned pixmap.
qreal dpr = 1.0;
for (uint i = 0; i < displayCount; ++i)
dpr = qMax(dpr, images.at(i).devicePixelRatio());
// Allocate target pixmap and draw each screen's content
qCDebug(lcQpaScreen) << "Create grap pixmap" << grabRect.size() << "at devicePixelRatio" << dpr;
QPixmap windowPixmap(grabRect.size() * dpr);
windowPixmap.setDevicePixelRatio(dpr);
windowPixmap.fill(Qt::transparent);
QPainter painter(&windowPixmap);
for (uint i = 0; i < displayCount; ++i)
painter.drawImage(destinations.at(i), images.at(i));
return windowPixmap;
}
/*!
The screen used as a reference for global window geometry
*/
QCocoaScreen *QCocoaScreen::primaryScreen()
{
auto screen = static_cast<QCocoaScreen *>(QGuiApplication::primaryScreen()->handle());
Q_ASSERT_X(screen == get(CGMainDisplayID()), "QCocoaScreen",
"The application's primary screen should always be in sync with the main display");
return screen;
}
QList<QPlatformScreen*> QCocoaScreen::virtualSiblings() const
{
QList<QPlatformScreen*> siblings;
// Screens on macOS are always part of the same virtual desktop
for (QScreen *screen : QGuiApplication::screens())
siblings << screen->handle();
return siblings;
}
QCocoaScreen *QCocoaScreen::get(NSScreen *nsScreen)
{
return get(nsScreen.qt_displayId);
}
QCocoaScreen *QCocoaScreen::get(CGDirectDisplayID displayId)
{
for (QScreen *screen : QGuiApplication::screens()) {
QCocoaScreen *cocoaScreen = static_cast<QCocoaScreen*>(screen->handle());
if (cocoaScreen->m_displayId == displayId)
return cocoaScreen;
}
return nullptr;
}
NSScreen *QCocoaScreen::nativeScreen() const
{
if (!m_displayId)
return nil; // The display has been disconnected
// A single display may have different displayIds depending on
// which GPU is in use or which physical port the display is
// connected to. By comparing UUIDs instead of display IDs we
// ensure that we always pick up the appropriate NSScreen.
QCFType<CFUUIDRef> uuid = CGDisplayCreateUUIDFromDisplayID(m_displayId);
for (NSScreen *screen in [NSScreen screens]) {
if (CGDisplayCreateUUIDFromDisplayID(screen.qt_displayId) == uuid)
return screen;
}
qCWarning(lcQpaScreen) << "Could not find NSScreen for display ID" << m_displayId;
return nil;
}
CGPoint QCocoaScreen::mapToNative(const QPointF &pos, QCocoaScreen *screen)
{
Q_ASSERT(screen);
return qt_mac_flip(pos, screen->geometry()).toCGPoint();
}
CGRect QCocoaScreen::mapToNative(const QRectF &rect, QCocoaScreen *screen)
{
Q_ASSERT(screen);
return qt_mac_flip(rect, screen->geometry()).toCGRect();
}
QPointF QCocoaScreen::mapFromNative(CGPoint pos, QCocoaScreen *screen)
{
Q_ASSERT(screen);
return qt_mac_flip(QPointF::fromCGPoint(pos), screen->geometry());
}
QRectF QCocoaScreen::mapFromNative(CGRect rect, QCocoaScreen *screen)
{
Q_ASSERT(screen);
return qt_mac_flip(QRectF::fromCGRect(rect), screen->geometry());
}
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug debug, const QCocoaScreen *screen)
{
QDebugStateSaver saver(debug);
debug.nospace();
debug << "QCocoaScreen(" << (const void *)screen;
if (screen) {
debug << ", geometry=" << screen->geometry();
debug << ", dpr=" << screen->devicePixelRatio();
debug << ", name=" << screen->name();
debug << ", native=" << screen->nativeScreen();
}
debug << ')';
return debug;
}
#endif // !QT_NO_DEBUG_STREAM
QT_END_NAMESPACE
@implementation NSScreen (QtExtras)
- (CGDirectDisplayID)qt_displayId
{
return [self.deviceDescription[@"NSScreenNumber"] unsignedIntValue];
}
@end