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Like eglfs, linuxfb (when QT_QPA_FB_DRM=1) can be configured to
use a buffer and fb of a format other than the default XRGB8888.
Most notably, adding "mode": "rgb565" to the first output in the
config file pointed to by QT_QPA_KMS_CONFIG will switch over
to using 16 bpp dumb buffers and a QImage::Format_RGB16 wrapping
QImage. Note that linuxfb/drm has no multiple output support atm,
so only the first output is taken into account.
The BGR variants (e.g. xbgr8888) are available but cause no
difference when it comes to Qt's painting (still maps to RGB32 etc.).
This may need to be revisited later.
Has no effect on the regular (fbdev) path in linuxfb.
Task-number: QTBUG-63272
Change-Id: Ie7d0b05e3449b336104332d9568dab60b4bedaa8
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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Explicitly declare which DRM event context version we want to use,
rather than just the latest one libdrm supports. New versions may change
semantics, or extend the structure, in ways we're unaware of.
Stick with version 2, which is the version that introduced
page_flip_handler.
Change-Id: I1d2066d5ab485ea571f016a8660829f435821c82
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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drmEventContext has grown by one pointer, so the build fails with an
error about a member without initialization.
qeglfskmsgbmdevice.cpp:147:5: error: missing initializer for member ‘_drmEventContext::page_flip_handler2’ [-Werror=missing-field-initializers]
Change-Id: I0e1a09998253489388abfffd14b6014b1ddc90e1
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Not having a way to say that a given output should be registered as the
primary screen (meaning it comes first in the QGuiApplication::screens() list,
emits primaryScreenChanged() signal etc.) can be a problem for some systems.
The order of the outputs array in the JSON configuration file is not relevant
in this respect since screens are registered either in the original DRM connector
order, or, when the virtual desktop layout is specified via virtualIndex, in the
order specified by virtualIndex. The primary screen status is independent from this.
Therefore, add a new, optional boolean property: primary. For example, the following
forces the QScreen corresponding to the VGA output to be the primary screen on the
Renesas R-Car H2 board, even though by default it is the HDMI one that happens to
be reported first by the system.
{
"device": "/dev/dri/card0",
"outputs": [
{ "name": "HDMI1", "mode": "1280x720" },
{ "name": "VGA1", "mode": "1280x720", "primary": true },
{ "name": "LVDS1", "mode": "off" }
]
}
In addition, improve the quality of the logging output.
[ChangeLog][Platform Specific Changes] Added support for specifying the primary screen
in the JSON config file in QT_QPA_EGLFS_KMS_CONFIG when running on DRM/KMS with eglfs.
Task-number: QTBUG-57980
Change-Id: Iba490800dee3b7162c68c4d40b0822f3f6d81b69
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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Add a QFbScreen implementation that uses DRM dumb buffers and page
flipping, thus implementing a vsynced, double (triple) buffered plain
software platform plugin. Besides better supporting systems that by
now only do fbdev via (possibly buggy) emulation, this can also be an
enabler for implementing certain types of 2D accelerated compositors
e.g. for Wayland.
Enable with QT_QPA_FB_DRM=1. Right now there is no good way to
autodetect the support for dumb buffers early enough so the default is
always the traditional fbdev path.
Long-term this will also enable proper multi-display support like with
eglfs' DRM backends. Multiple QScreens are not yet reported currently
due to the single-screen limitations of fbconvenience.
The generic DRM code is shared with eglfs, meaning configuration
happens via the JSON file specified in QT_QPA_(EGLFS_)KMS_CONFIG. This
allows changing the screen resolution, disabling outputs, etc.
[ChangeLog][Platform Specific Changes][linuxfb] Added experimental
support for DRM dumb buffers. Enable by setting the environment
variable QT_QPA_FB_DRM to 1.
Task-number: QTBUG-56306
Change-Id: I4bdcf16fff67412183220dffa0c4ea235c5cad3d
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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