From 99d0f997aa84e210178fc1f6dfc6321be8b33cf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tor=20Arne=20Vestb=C3=B8?= <tor.arne.vestbo@qt.io>
Date: Wed, 2 Aug 2023 16:32:15 +0200
Subject: [PATCH] iOS: Implement QPlatformWindow::setMask() for masking
 rendering and input

Same implementation as for macOS.

[ChangeLog][iOS] QWindow::setMask() is now supported for masking the
rendering and touch input of child windows.

Change-Id: I2f9429f0f8fa278fdd8edc15c7b242c7c6bc0ff0
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
(cherry picked from commit ed7c7a1458a0d903cea250e8b7272c6b5bf9c624)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/plugins/platforms/ios/qioswindow.h  |  2 ++
 src/plugins/platforms/ios/qioswindow.mm | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/plugins/platforms/ios/qioswindow.h b/src/plugins/platforms/ios/qioswindow.h
index 90380e4bb06..6a50ccfbcec 100644
--- a/src/plugins/platforms/ios/qioswindow.h
+++ b/src/plugins/platforms/ios/qioswindow.h
@@ -56,6 +56,8 @@ public:
 
     void requestUpdate() override;
 
+    void setMask(const QRegion &region) override;
+
 #if QT_CONFIG(opengl)
     CAEAGLLayer *eaglLayer() const;
 #endif
diff --git a/src/plugins/platforms/ios/qioswindow.mm b/src/plugins/platforms/ios/qioswindow.mm
index 8de094533bf..908ead2e5d2 100644
--- a/src/plugins/platforms/ios/qioswindow.mm
+++ b/src/plugins/platforms/ios/qioswindow.mm
@@ -11,7 +11,10 @@
 #include "quiview.h"
 #include "qiosinputcontext.h"
 
+#include <QtCore/private/qcore_mac_p.h>
+
 #include <QtGui/private/qwindow_p.h>
+#include <QtGui/private/qhighdpiscaling_p.h>
 #include <qpa/qplatformintegration.h>
 
 #if QT_CONFIG(opengl)
@@ -54,6 +57,7 @@ QIOSWindow::QIOSWindow(QWindow *window)
 
     setWindowState(window->windowStates());
     setOpacity(window->opacity());
+    setMask(QHighDpi::toNativeLocalRegion(window->mask(), window));
 
     Qt::ScreenOrientation initialOrientation = window->contentOrientation();
     if (initialOrientation != Qt::PrimaryOrientation) {
@@ -355,6 +359,20 @@ void QIOSWindow::requestUpdate()
     static_cast<QIOSScreen *>(screen())->setUpdatesPaused(false);
 }
 
+void QIOSWindow::setMask(const QRegion &region)
+{
+    if (!region.isEmpty()) {
+        QCFType<CGMutablePathRef> maskPath = CGPathCreateMutable();
+        for (const QRect &r : region)
+            CGPathAddRect(maskPath, nullptr, r.toCGRect());
+        CAShapeLayer *maskLayer = [CAShapeLayer layer];
+        maskLayer.path = maskPath;
+        m_view.layer.mask = maskLayer;
+    } else {
+        m_view.layer.mask = nil;
+    }
+}
+
 #if QT_CONFIG(opengl)
 CAEAGLLayer *QIOSWindow::eaglLayer() const
 {