eglfs_kms_vsp2: Add support for setting layer alpha

Exposed through QEglFSFunctions::vsp2SetLayerAlpha.

Change-Id: I2a600971d5a2aa56d4bf7cde03df3323f17249cd
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_vsp2/qlinuxmediadevice.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_vsp2/qlinuxmediadevice.cpp
index 21de052b87..25b0c39050 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_vsp2/qlinuxmediadevice.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_vsp2/qlinuxmediadevice.cpp
@@ -533,6 +533,14 @@ bool QLinuxMediaDevice::OutputSubDevice::streamOff()
     return QLinuxMediaDevice::streamOff(m_subdevFd, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
 }
 
+int QLinuxMediaDevice::openVideoDevice(media_pad *pad)
+{
+    const char *deviceName = media_entity_get_devname(pad->entity);
+    int fd = open(deviceName, O_RDWR);
+    qCDebug(qLcEglfsKmsDebug) << "Opened video device:" << deviceName << "with fd" << fd;
+    return fd;
+}
+
 bool QLinuxMediaDevice::setSubdevFormat(struct media_pad *pad, const QSize &size, uint32_t mbusFormat)
 {
     Q_ASSERT(size.isValid());
@@ -556,6 +564,18 @@ bool QLinuxMediaDevice::setSubdevFormat(struct media_pad *pad, const QSize &size
     return true;
 }
 
+bool QLinuxMediaDevice::setSubdevAlpha(int subdevFd, qreal alpha)
+{
+    struct v4l2_control control;
+    control.id = V4L2_CID_ALPHA_COMPONENT;
+    control.value = static_cast<__s32>(alpha * 0xff);
+    if (ioctl(subdevFd, VIDIOC_S_CTRL, &control) == -1) {
+        qErrnoWarning("Setting alpha (%d) failed", control.value);
+        return false;
+    }
+    return true;
+}
+
 bool QLinuxMediaDevice::setSubdevSelection(struct media_pad *pad, const QRect &geometry, uint target)
 {
     Q_ASSERT(geometry.isValid());