eglfs_kms: Output cloning support

{
    "device": "/dev/dri/card0",
    "outputs": [
	{ "name": "HDMI1", "mode": "1920x1080" },
	{ "name": "DP1", "mode": "1920x1080", "clones": "HDMI1" }
   ]
}

Here, assuming the QScreen for DP1 is unused and the resolution is the same,
DP1 will simply mirror whatever is on HDMI1.

The plane-based mouse cursor is not currently supported. Same goes for any
form of scaling since this simply scans out the same framebuffer on all
target CRTCs.

Task-number: QTBUG-62262
Change-Id: I391be204264284a1bff752ebc2a1dbe5c8592013
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
index e218d580a2..47752510b6 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
@@ -161,4 +161,15 @@ QPlatformScreen *QEglFSKmsGbmDevice::createScreen(const QKmsOutput &output)
     return screen;
 }
 
+void QEglFSKmsGbmDevice::registerScreenCloning(QPlatformScreen *screen,
+                                               QPlatformScreen *screenThisScreenClones,
+                                               const QVector<QPlatformScreen *> &screensCloningThisScreen)
+{
+    if (!screenThisScreenClones && screensCloningThisScreen.isEmpty())
+        return;
+
+    QEglFSKmsGbmScreen *gbmScreen = static_cast<QEglFSKmsGbmScreen *>(screen);
+    gbmScreen->initCloning(screenThisScreenClones, screensCloningThisScreen);
+}
+
 QT_END_NAMESPACE