eglfs_kms: Add headless mode for DRM render nodes

Attempting to switch /dev/dri/cardX to /dev/dri/renderDY is futile
on its own now since many output-related drm operations fail and we
eventually crash.

Add a new headless mode that skips the real screen stuff and registers
a fairly dummy, headless screen, does not bother with the mouse cursor,
and disallows rendering to the screen via a QWindow (while keeping the
actual rendering still fully functional).

Such applications will not need any special privileges and will run even
if there is a DRM master (X11, Wayland compositor) active.

For example the configuration can look like this:

{
    "device": "/dev/dri/renderD128",
    "headless": "1024x768"
}

After this applications have two choices to perform offscreen
rendering:

1. Use an ordinary window (and its default framebuffer, meaning the
gbm_surface), e.g. a QOpenGLWindow subclass

  MyOpenGLWindow w;
  w.show(); // will not actually show on screen
  w.grabFramebuffer().save("output.png");

Note that there is no vsync-based throttling. Also note that windows are
still sized to match the screen size, hence the need for specifying a size
in the headless property.

2. Or the typical offscreen approach with an extra FBO

  QOffscreenSurface s;
  s.setFormat(ctx.format());
  s.create();
  ctx.makeCurrent(&s0;
  QOpenGLFramebufferObject fbo(1024, 768);
  fbo.bind();
  ctx.functions()->glClearColor(1, 0, 0, 1);
  ctx.functions()->glClear(GL_COLOR_BUFFER_BIT);
  fbo.toImage().save("output.png");
  ctx.doneCurrent();

Task-number: QTBUG-62262
Change-Id: Ic1dbfa2b27b223bd5ef8ba36b665f0f61abf4f06
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
index 47752510b6..79c9687dc6 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmdevice.cpp
@@ -151,7 +151,7 @@ void QEglFSKmsGbmDevice::handleDrmEvent()
 
 QPlatformScreen *QEglFSKmsGbmDevice::createScreen(const QKmsOutput &output)
 {
-    QEglFSKmsGbmScreen *screen = new QEglFSKmsGbmScreen(this, output);
+    QEglFSKmsGbmScreen *screen = new QEglFSKmsGbmScreen(this, output, false);
 
     if (!m_globalCursor && screenConfig()->hwCursor()) {
         qCDebug(qLcEglfsKmsDebug, "Creating new global GBM mouse cursor");
@@ -161,6 +161,11 @@ QPlatformScreen *QEglFSKmsGbmDevice::createScreen(const QKmsOutput &output)
     return screen;
 }
 
+QPlatformScreen *QEglFSKmsGbmDevice::createHeadlessScreen()
+{
+    return new QEglFSKmsGbmScreen(this, QKmsOutput(), true);
+}
+
 void QEglFSKmsGbmDevice::registerScreenCloning(QPlatformScreen *screen,
                                                QPlatformScreen *screenThisScreenClones,
                                                const QVector<QPlatformScreen *> &screensCloningThisScreen)