Commit Graph

6178 Commits

Author SHA1 Message Date
Jonas Ådahl
0b4d80d74f wayland/output: Operate on monitors instead of outputs
Operate on MetaMonitor's instead of MetaOutput's, as the latter may be
only a subset of an actual "monitor" when referring to the physical
computer equipment.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
1a2b493d17 tests/monitor-unit-tests: Check current monitor mode
Check both that current mode is up to date, and that deriving it again
won't change it.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
9ceeddd952 monitor: Track current monitor mode
Track what monitor mode is the current. This is derived from the mode
of the corresponding CRTC's.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
e1849ccbfa monitor: Add getter for vendor and serial
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
6262b46928 wayland/output: Pass 'unknown' subpixel order when mismatch
When a logical monitor constains monitors with different subpixel
ordering, make the wl_output have the subpixel order 'unknown' so that
clients don't make assumptions given only a subset of the monitors of
the given region.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
8752f40792 monitor-manager-kms: Some harmless style fixes
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
8c5600e81b monitor-manager-kms: Handle EDID blob not being ready immediately
Sometimes we hit a race on hot-plug where we try to read the KMS
resources and the EDID blob is not yet ready. This would normally
result in a ENOENT when retrieving the blob. Handle this by retrying
after 50 milliseconds after a hot-plug event. Do this up to 10 times,
and after that give up trying to get the EDID blob and continue with
best effort.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
4c1b48d0cc monitor: Add API to get monitor mode from spec
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
536ae8430b monitor-manager: Add API to get monitor from monitor spec
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
aaddf44d45 monitor-manager: Add API to find primary monitor
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:55 +08:00
Jonas Ådahl
0c42faf34d monitor-manager: Some trivial style fixes
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
be13d0f8ee monitor: Allow monitor mode foreach crtc iterator failable
Allow the function used to iterate over the CRTC modes of a monitor
mode to fail, causing the iteration to fail as well.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
81438eebef monitor-unit-tests: Test suggested-x/y configuration
Test the suggested-x/y output state often set by virtual machines.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
b70187c2d9 monitor-manager: Move meta_monitor_manager_ function to right place
Move a meta_monitor_manager_ function to meta-monitor-manager.c where
it belongs.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
c041851fa5 monitor-manager: Rename read_current_config to read_current_state
The function meta_monitor_manager_read_current_config() was renamed to
meta_monitor_manager_read_current_state() as it does not read any
configuration, but reads the current state as described by the backend.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
b59a8b1de3 monitor-manager: Move configuration paths behind 'legacy' functions
In preparation of replacing the configuration system with one working
with high level monitors instead of low level outputs etc, move
configuarion handling code into obviously named function (containing
the word 'legacy'.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
e3b9fe7e58 monitor-manager: Use MetaMonitor to check laptop panel status
Instead of looking at the current configuration, just find the
MetaMonitor of the laptop display panel and check the currest status
directly.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
0177ab45af MetaMonitor: Add _is_laptop_panel() helper
Add a helper to determine whether the monitor is the laptop panel or
not. To be used by the configuration system.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
bc951557e8 monitor: Add monitor spec object
A monitor spec object is meant to be used to identify a certain monitor
on a certain output. The spec is unique per actual monitor and connector,
meaning that a monitor that changes from one connector from another
(e.g. HDMI1 to HDMI2) will not be identified as the same. It is meant
to associate for example a configuration entry with an actual monitor.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
2c32d94e1d monitor: Determine preferred monitor mode
Determine the preferred monitor mode given what the preferred CRTC mode
is, and expose it via the API.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
5d9e2d8d2e MetaMonitor: Add mode spec concept
Add a "mode spec" concept, meaning to be used as a identifier for an
actual monitor mode. It consists of details making a mode unique, i.e.
the total resolution and refresh rate. This will later be used to get
the actual monitor mode (set of one or more CRTC modes).

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
0637537355 monitor-config: Modernize type declaration
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
63ed134165 monitor-unit-tests: Check monitor modes
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
a6f464a600 monitor: Add monitor modes abstraction
Add "monitor modes" abstracting the modes set on a monitor. On normal
monitors, this directly maps to the CRTC modes, but on tiled monitors,
a monitor mode can consist modes per tiled output.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
0a0c49af71 logical-monitor: Remove outdated comment
Remove the comment about tiling things being calculated. It doesn't add
anything valuable, and tiling is hidden behind MetaMonitor.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
3c6d688c87 logical-monitor: Don't mirror refresh rate
Let the callers figure out how to associate a logical monitor with a
refresh rate, instead of exposing an arbitrary one.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
5d66a13397 logical-monitor: Don't mirror physical dimensions
Don't try to mirror the physical dimension, since that's a property of
one of the monitors, not of the logical monitor. Callers are changed to
deal with choosing the monitor to represent the logical monitor.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
ff633f295e logical-monitor: Don't duplicate output list
Just use the monitor list and the output lists of each monitor.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
310064601c monitor-unit-tests: Check tiled monitor adding/removing notification
Check that the moniter manager backends get the tiled monitor
added/removed notification.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
78799e58d2 monitor-manager: Make tiled Xrandr monitors based on monitors
Don't deal with adding/removing tiled Xrandr monitors in the generic
backend, but leave it to the Xrandr backend. The tiled monitor will
itself notify the backend when such a monitor is added and removed.

Tiled Xrandr monitors are now based no MetaMonitor instead of
MetaLogicalMonitor. This means that mirrored tiled monitors will now be
represented correctly.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
4fa8b74dc7 monitor-unit-tests: Add musing about test declarations
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
bf8b4e9927 monitor-manager: Generate logical monitors from monitors
Instead of using crtcs and outputs to generate logical monitors, use
the ready made monitor abstraction that hides irrelevant things such as
monitor tiling etc.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
f48acd8448 tests: Check that the crtc gets a logical monitor set
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:54 +08:00
Jonas Ådahl
d0c9d2dc7b tests: Check that the monitors are properly generated
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
d9a0f2a88d monitor-manager: Generate a monitor abstraction from outputs and crtcs
Generate a set of "monitors" abstracting the physical concepts. Each
monitor is built up of one or more outputs; multiple outputs being
tiled monitors. Logical monitors will later be built from these.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
4e812410cc monitor-manager: Move logical monitor into its own file
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
0873e3812b backends: Rename MetaMonitorMode to MetaCrtcMode
The MetaMonitorMode referred to the mode of a CRTC, and with the future
introduction of a MetaMonitor, theh old name would be confusing.
Instead call it what it is.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
7eac28189b monitor-manager: Fix private header guard
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
1650c35e38 monitor-manager: Rename MetaCRTC(Info) to MetaCrtc(Info)
Change to follow the naming convention used everywhere else. This means
changing CRTC to Crtc even though it is an abbreviation.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
156c478ccb tests/monitor: Add HiDPI test
This doesn't test the actual calculation, since that is done in the
backend, it only tests the configuration.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
10e6eae0dd tests/monitor: Add tiled monitor test
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
f519093f89 monitor-manager: Initialize tiled logical monitor scale
The logical monitor scale were not initialized properly when created
for a tiled monitor. Set it to the scale of the main monitor tile.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
8a8ab6c673 tests/monitor: Test preferred mode
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
9e28303588 tests/monitor: Test one out of two outputs being off
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
6776329cf5 tests/monitor: Test two crtcs, one output
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
2e4c516d43 tests/monitor-manager: Add API to emulate a hotplug event
Let a test case pass a test setup, which will be used as the new state
emulated by the test backend.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
d920eaba4a tests: Also make test case verification declarative
Set up the expected result in a declarative way in the same place as
the test case setup is declared. This way we have a completely
declarative way to create test cases.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
376a76a082 tests: Make monitor test case setup more declarative
In order to more easily create more test cases, make the test case
setup more declarative.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
c6d940d3b2 tests: Make monitor unit tests create initial config
This way we have both the test setup and testing in the same file.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
95c101a0ba tests: Use custom Wayland display name
This gets rid of a warning about the Wayland display name already being
taken.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
239671f882 wayland: Add API to override display name
Add API that the tests can use in order to override the Wayland display
name.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
12150c1ca7 tests: Add basic monitor configuration tests
The added test checks that two monitors are lied out on a row next to
each other.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
a251675cc0 tests: Use special purpose backend in unit tests
Use a special purpose backend when running the unit tests. This will
eventually allow testing things like configuration and hot plugging.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
d188949101 backends/x11: Make the X11 backend derivable
Make the X11 backend derivable so that we can base a nested test backend
on it.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:53 +08:00
Jonas Ådahl
d3920ddb67 core: Add private API to override compositor configuration
Add private API for overriding the compositor configuration, i.e. the
compositor type (X11 WM or Wayland compositor) and backend type. This
will make it possible to add a special test backend used by src/tests/.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
bc5077f623 screen: Put xinerama monitor index outside of MetaLogicalMonitor
Put the monitor xinerama index in a separate struct that is attached to
the logical monitor using g_object_set/get_qdata(). Eventually this
should be moved to some "X11 window manager" object, but lets keep it
in MetaScreen until we have such a thing.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
68f3b5849a workspace: Don't keep state given logical monitor indices
Don't store logical monitor specific state in an array where the index
from the monitor manager is used as index locally. Instead just use
table associating a logical monitor with a monitor specific state
holder, and store the state in there. This way we don't have the
workspace implementation relying on implementation details of other
units.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
6de3e4a07e Turn MetaLogicalMonitor into a GObject
This will make it easier to move various manually managed data and data
now in MetaLogicalMonitor into GObject QData fields.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
1fb0e8e9bb monitor-manager: Store logical monitors in a GList
Instead of storing the logical monitors in an array and having users
either look up them in the array given an index or iterate using
indices, put it in a GList, and use GList iterators when iterating and
alternative API where array indices were previously used.

This allows for more liberty regarding the type of the logical monitor.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
20b8743f21 monitor-manager: Refactor tiled monitor assembly code
Refactor the tiled monitor assembly code (that constructs a logical
monitor out of tiling information. Part of the reason is to move away
from array based storage, part is to make the code easier to follow,
and part is to separate logical monitor construction from list
manipulation.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
016359ede2 window: Remove public meta_window_get_all_monitors API
It's not used anywhere and used monitor indices which is unoptimal.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
410bad88a8 screen: Don't use monitor indices in check_fullscreen_func
Rewrite check_fullscreen_func to not use indexes (and
offset-index-as-pointer) tricks. This also removes the usage of an API
constructing temporary logical monitor arrays carrying indices.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
c98bab8327 monitor-manager: Make logical monitor from point API take floats
Change meta_monitor_manager_get_logical_monitor_at() to use floats,
replace users of meta_monitor_manager_get_monitor_at_point() to use the
API that returns a logical monitor and remove the now unused function.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
a422d6fe08 Move logical monitor neighbor API into monitor manager
Move the last piece of monitor grid getter API to the monitor manager
away from MetaScreen. The public facing API are still there, but are
thin wrappers around the MetaMonitorManager API.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
98ee85ce82 Let the MetaWindow calculate its main logical monitor itself
There is no point in going via a MetaScreen API to calculate the "main
monitor" of a window, so let the window do that calculation itself.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
5a8509f895 Move current logical monitor retrieval to the backends
The method used for getting the current logical monitor (the monitor
where the pointer cursor is currently at) depends on the backend type,
so move that logic to the corresponding backends.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
06770b0dd4 display: Use logical monitor API when requesting pad OSD
Don't use the array index based logical monitor API and switch to the
one directly referencing logical monitor instances.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
af616c96d4 Move more logical monitor getters from the screen to the monitor manager
Turning a rectangle into a logical monitor also has nothing to do with
the screen (MetaScreen) so move it to MetaMonitorManager which has that
information.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
f5b2d79f3b backends: Use macros for declaring the backend types
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
d644993a74 MetaBackend: Move fields from MetaBackend into MetaBackendPrivate
Lets prepare for being able to declare the MetaBackend type using
the macro helper.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
2df4ebff47 Put logical monitor grid lookup API in MetaMonitorManager
Don't falsely assume the screen has anything to do with the monitor
grid, and thus move the related API to MetaMonitorManager.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
9337d18468 screen: Remove meta_screen_get_current_monitor_for_pos from public API
It was not used by anyone, and had strange caching behaviour to begin
with.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:52 +08:00
Jonas Ådahl
317b734dcc Move cursor tracker ownership to the backend
Let the backend initialize the cursor tracker, and change all call
sites to get the cursor tracker from the backend instead of from the
screen. It wasn't associated with the screen anyway, so the API was
missleading.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
e35ac9be8d cursor-tracker: Don't cache a private pointer to the cursor renderer
This means we don't rely on contruction order any more.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
6dbb524b9f core/events: Only get MetaBackend once in meta_display_handle_event
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
a3f0bf3ff8 core/events: Don't shadow variable name
Don't use the same variable name for two different things (gesture
tracker vs cursor tracker).

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
ecf796f82b window: Keep track of fullscreen monitors directly
Instead of keeping around array indexes, keep track of them by storing
a pointer instead. This also changes from using an array (imitating the
X11 behaviour) to more explicit storing.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
0a4fb008f3 core/place: Use logical monitor references instead of indices
Don't rely on the API exposing implementation details and replace it
with the API that takes direct references.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
79fd91ec35 Add API for getting work area given a logical monitor
To complement the current API which takes an index referencing a
logical monitor in the logical monitor array, add API that takes a
direct reference to the logical monitor itself. The intention is to
replace the usage of the index based API with one that doesn't rely on
internal implementation details.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
e659b07c39 MetaMonitorManager: Add API turning monitor index into logical monitor
This is the current equivalent of looking up the logical monitor in the
logical monitor array using the number, but eventually that will be
deprecated, and before that done differently, so add a temporary helper
for the places that has not been ported yet.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
441b854d41 MetaScreen: Remove const qualifiers from monitor getters
They will cause issues when monitors are stared in a GList.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
c936056663 MetaMonitorManager: Track primary monitor by pointer instead of index
Instead of keeping an index in an array to keep track of the current
primary logical monitor, just keep a pointer instead.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
e22bbd4b14 MetaScreen: Remove redundant copy of logical monitors array
It was just pointer to the actual list; having to synchronize a list of
logical monitors with the actual monitors managed by the backend is
unnecessary.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
103df63023 MetaWindow: Clear fullscreen monitors when monitors change
The fullscreen monitors state is set given a set of xinerama monitor
identification numbers. When the monitor configuration changes (e.g. by
a hotplug event) these are no longer valid, and may point to
uninitialized or unallocated data. Avoid accessing
uninitialized/unallocated memory by clearing the fullscreen monitor
state when the monitor configuration changes.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
36f2d5b0f1 wayland: Make surface role vfunc better named
It checks whether a surface is on a given "logical monitor", not
output. Output here is the Wayland name for the same thing, but should
not be confused with MetaOutput.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
920cc15ea9 screen: Fly-by coding style fixes
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
842ff5d6aa Rename MetaMonitorInfo MetaLogicalMonitor
In preparation for further refactorizations, rename the MetaMonitorInfo
struct to MetaLogicalMonitor. Eventually, part of MetaLogicalMonitor
will be split into a MetaMonitor type.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
e1b10769e5 screen: Remove unused function
https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Jonas Ådahl
4177d4f9f4 MetaMonitorManagerKms: Don't leak tile property blob
Also warn when we don't understand the property blob we got.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-01-25 16:28:51 +08:00
Bastien Nocera
9b64e09a24 egl: Fix GCC warning
src/backends/meta-egl.c: In function ‘set_egl_error’:
src/backends/meta-egl.c:144:16: error: format not a string literal and no format arguments [-Werror=format-security]
      error_str);
      ^~~~~~~~~

https://bugzilla.gnome.org/show_bug.cgi?id=777389
2017-01-17 14:22:27 +01:00
Jonas Ådahl
2df35d636e MetaWaylandEglStream: Use EGL_WL_wayland_eglstream instead of fd hack
Use the proposed EGL_WL_wayland_eglstream EGL extension instead of the
file descriptor hack that was used as a temporary solution.

Note that this results in EGL clients will no longer work if they are
running on a Nvidia driver with a version older than 370.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
f7fd018cf8 wayland/buffer: Remove unnecessary break
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
405aa8fb9e wayland/buffer: Add 'realization' concept to buffers
Instead of having a way to determine the type of a buffer, add a
realization step that implicitly detects the buffer type. This makes it
possible to both realize (i.e. creating needed objects from the buffer)
and determine the type at the same time, which may be the only possible
way (for example, the only way to know whether a buffer is a EGLStream
is to create the EGLStream from it).

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
0a826da330 egl: Add EGL_WL_wayland_eglstream helpers
These are to replace the file descriptor hack currently in use.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
139bed73f8 MetaRendererNative: Remove unnecessary ifdef
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
778f92e170 egl: Use correct proc to meta_egl_stream_consumer_aquire_attrib
It should be eglStreamConsumerAcquireAttribNV and not
eglStreamConsumerAcquireAttribEXT as the EXT variant is not defined in
any extension.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2017-01-03 17:50:03 +08:00
Jonas Ådahl
81b11929f7 wayland/xdg-shell: Scale window menu coordinates
When the monitor the surface is on has a scale other than 1, the
coordinate of the window menu popup position needs to be scaled, as it
is reported in logical pixels, while the stage is still in physical
pixels.

https://bugzilla.gnome.org/show_bug.cgi?id=776055
2016-12-30 21:44:51 +08:00
Olivier Fourdan
76012506ff wayland: Preserve the event mask on the root window
A window manager must select the SubstructureRedirect mask on the root
window to receive the MapRequest from the X11 clients and manage the
windows. Without this event mask set, a window manager won't be able to
map any new window.

The Wayland selection code in mutter can change/clear the event mask on
the requestor window from a XSelectionRequest event when the window is
not managed by mutter/gnome-shell.

A rogue or simply buggy X11 client may send a XConvertSelection() on the
root window and mutter will happily change/clear its own event mask on
the root window, effectively turning itself into a regular X11 client
unable to map any new X11 window from the other X11 clients.

To avoid this, simply check that the requestor window is not the root
window prior to change/clear the event mask on that window.

https://bugzilla.gnome.org/show_bug.cgi?id=776128
2016-12-15 13:01:57 +01:00
Olivier Fourdan
1ab6ac2996 wayland: disconnect mapped signal handler on destroy
Commit 5eb5f72 - wayland: Check surface outputs after mapped state
changes connected the ::mapped signal handler, we need to disconnect it
on destroy to avoid a possible assertion failure in
update_surface_output_state()

https://bugzilla.gnome.org/show_bug.cgi?id=776036
2016-12-13 15:34:03 +01:00
Rui Matos
c98d5448ec wayland: Ensure we don't focus xdg_popups iff they're non-grabbing
Commit 4295fdb892 made us skip focusing
all xdg_popups instead of just non-grabbing ones as intended. This
means that when unmanaging a window we might select a xdg_popup window
to focus (in meta_stack_get_default_focus_window() ) but then since we
don't actually focus it we go on unmanaging the focused window which
triggers an assertion, as it should.

To avoid this and still fixing bug 771694 we can make use of the
MetaWindow->input property for non-grabbing xdg_popup windows since
their semantics, in this regard, are the same as no input X11 windows.

This way, when unmanaging a focused window while a xdg_popup is up,
we'll either give focus to the xdg_popup or not select the popup at
all to be focused if it's non-grabbing.

https://bugzilla.gnome.org/show_bug.cgi?id=775986
2016-12-13 15:03:39 +01:00
Rui Matos
cfafb0bfca MetaRendererNative: Flush all pending swap notifies on idle
We need to do swap notifications asynchronously from flip events since
these might be processed during swap buffers if we are waiting for the
previous frame's flip to continue with the current.

This means that we might have more than one swap notification queued
to be delivered when the idle handler runs. In that case we must
deliver all notifications for which we've already seen a flip event.

Failing to do so means that if a new frame, that only swaps buffers on
such a swap notification backlogged Onscreen, is started, when later
we get its flip event, we'd notify only an old frame which would hit
this MetaStageNative's frame_cb() early exit:

  if (global_frame_counter <= presented_frame_counter)
    return;

and we'd never finish the new frame and thus clutter's master clock
would be waiting forever stuck.

https://bugzilla.gnome.org/show_bug.cgi?id=774557
2016-12-07 16:48:22 +01:00
Carlos Garnacho
5eb5f72434 wayland: Check surface outputs after mapped state changes
So they consistently receive wl_surface.leave after the surface
is not visible anymore.

https://bugzilla.gnome.org/show_bug.cgi?id=775478
2016-12-02 12:04:40 +01:00
Florian Müllner
ff5a7ba9b9 build: Add missing file 2016-11-23 22:20:48 +01:00
Florian Müllner
c50ae726a9 build: Fix typo 2016-11-23 21:58:23 +01:00
Rui Matos
2b59b4c793 keybindings: Grab buttons with any modifier combo on unfocused windows
We currently only focus unfocused windows on button press if no
modifiers (or just ignored modifiers) are in effect. This behavior
seems surprising and counter-intuitive so let's do it for any modifier
combination instead.

https://bugzilla.gnome.org/show_bug.cgi?id=746642
2016-11-23 18:40:11 +01:00
Rui Matos
0249993377 keybindings: Remove #if 0'd code
There's no reason to keep this ~15 year old piece of code around as
well as the preference handling that would only make sense if this
hunk was actually enabled.

https://bugzilla.gnome.org/show_bug.cgi?id=746642
2016-11-23 18:40:05 +01:00
Jonas Ådahl
d9a9844005 MetaRendererNative: Don't requeue flush-swap-notify
When flush-swap-notify is already queued, we might end up trying to
requeue it, for example when handling flip callbacks inside
swap-buffers. Actually queuing it there is harmless, since old frames
will be discarded anyway.

https://bugzilla.gnome.org/show_bug.cgi?id=774923
2016-11-23 18:38:46 +01:00
Jonas Ådahl
227187f1f1 MetaRendererNative: Wait for the last flip callback before flipping
We might still end up in swap-buffer without the previous flip callback
having been invoked. This can happen if there are two monitors, and we
manage to draw before having all monitor flip callbacks invoked.

https://bugzilla.gnome.org/show_bug.cgi?id=774923
2016-11-23 18:38:44 +01:00
Jonas Ådahl
77384ffa9a MetaRendererNative: Let the closure handle queuing flip notification
The queuing that was removed in this commit would be done in the clean
up function of the closure anyway.

https://bugzilla.gnome.org/show_bug.cgi?id=774923
2016-11-23 18:38:43 +01:00
Rui Matos
1956a6ae76 window: Use the target rect for the grab anchor position on unmaximize
A window's unconstrained_rect is essentially just the target rectangle
we hand to meta_window_move_resize_internal() except it's not updated
until the window actually moves or resizes.

As such, for wayland client resizes, since they're async, using
window->unconstrained_rect right after calling move_resize_internal()
to update the grab anchor position on unmaximize doesn't work as it
does for X clients.

To fix this, we can just use the target rectangle for the grab
anchor. Note that comment here was already wrong since it says we
should be taking constraints into account and yet the code used the
unconstrained rect anyway.

https://bugzilla.gnome.org/show_bug.cgi?id=770345
2016-11-23 18:37:47 +01:00
Rui Matos
5df5b00927 Revert "wayland: Mark pending moved as moved"
This reverts commit 989ec7fc60.

We now rely on accurately knowing if a window moved and/or resized in
meta_window_move_resize_internal() so the wayland implementation can't
lie any longer.

https://bugzilla.gnome.org/show_bug.cgi?id=770345
2016-11-23 18:37:43 +01:00
Rui Matos
1d280d8fa1 window: Inform the compositor when a window effectively changes size
In order for the compositor plugin to be able to animate window size
changes properly we need to let it know of the starting and final
window sizes.

For X clients this can be done synchronously and thus with a single
call into the compositor plugin since it's us (the window manager)
who's in charge of the final window size.

Wayland clients though, have the final say over their window size
since it's determined from the client allocated buffer.

This patch moves the meta_compositor_size_change_window() calls before
move_resize_internal() which lets the compositor plugin know the old
window size and freezes the MetaWindowActor.

Then we get rid of the META_MOVE_RESIZE_DONT_SYNC_COMPOSITOR flag
since it's not needed anymore as the window actor is frozen and that
means we can use meta_compositor_sync_window_geometry() as the point
where we inform the compositor plugin of the final window size.

https://bugzilla.gnome.org/show_bug.cgi?id=770345
2016-11-23 18:37:35 +01:00
Rui Matos
9c03e78505 MetaPlugin: add a size_changed vfunc
This will be used to let plugins know when a previous size change
actually becomes effective. This is needed to handle wayland client
resizing properly since, unlike X, it's async.

https://bugzilla.gnome.org/show_bug.cgi?id=770345
2016-11-23 18:37:31 +01:00
Florian Müllner
4af62438f2 wayland: Fix cogl include
Do not include cogl.h in a way that may pick up the header from a
system-installed cogl version, which is incompatible with our
internal fork.
2016-11-23 18:03:59 +01:00
Florian Müllner
0aa6d9782c build: Fix cogl include paths
cogl-egl-defines.h is now referenced from a public header, so we need
to include its location whenever the header is used (directly or via
cogl.h).
2016-11-23 18:03:59 +01:00
Rui Matos
d829fa19d2 keybindings: Factor out a function to determine XIGrabModifiers
This de-dups code and reduces the amount of protocol round trips.

https://bugzilla.gnome.org/show_bug.cgi?id=746642
2016-11-21 15:34:43 +01:00
Rui Matos
76b6cc02d6 meta-monitor-config: Initialize MetaConfiguration's properly
We weren't initializing the ref count which means we could either be
leaking or end up using free'd memory.

https://bugzilla.gnome.org/show_bug.cgi?id=774135
2016-11-21 15:34:26 +01:00
Jonas Ådahl
2ed7ca5b6a constraints: Don't early out of custom rule if window can't fit
Still go through the rules. For example a tall menu might still be
positioned better, and/or shrunk to a better size if applicable.

https://bugzilla.gnome.org/show_bug.cgi?id=771297
2016-11-21 12:52:13 +08:00
Jonas Ådahl
5774fcdd80 MetaShapedTexture: Default to y-inverted being true
Normally textures in OpenGL are inverted on the Y axis, and we only
apply our rotation transform when it is not. To make the common case
work as normal, default to assuming textures are Y inverted.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 09:36:51 +08:00
Jonas Ådahl
eed4dab0fc wayland: Add support for EGLStream client buffers
This commit adds for a new type of buffer being attached to a Wayland
surface: buffers from an EGLStream. These buffers behave very
differently from regular Wayland buffers; instead of each buffer
reperesenting an actual frame, the same buffer is attached over and
over again, and EGL API is used to switch the content of the OpenGL
texture associated with the buffer attached. It more or less
side-tracks the Wayland buffer handling.

It is implemented by creating a MetaWaylandEglStream object, dealing
with the EGLStream state. The lifetime of the MetaWaylandEglStream is
tied to the texture object (CoglTexture), which is referenced-counted
and owned by both the actors and the MetaWaylandBuffer.

When the buffer is reattached and committed, the EGLStream is triggered
to switch the content of the associated texture to the new content.
This means that one cannot keep old texture content around without
copying, so any feature relying on that will effectively be broken.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
f5bdf75f70 egl: Add vfuncs needed for client EGLStream surfaces
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
7c31fb2450 MetaShapedTexture: Add support for setting a custom CoglSnippet
To support special types of buffer types, add support for setting a
CoglSnippet on the shaped texture which will then be added to the
pipeline.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
11783ffdd0 MetaSurfaceActorWayland: Remove API never used externally anymore
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
41c96921d6 wayland: Add support for EGL_WAYLAND_Y_INVERTED_WL
Add support for inverted Y Wayland buffers. OpenGL textures are by
default inverted, so adding support for EGL_WAYLAND_Y_INVERTED_WL
effectively means adding support for non-inverted, which makes the
MetaShapedTexture apply a transformation when drawing only when querying
EGL_WAYLAND_Y_INVERTED_WL resulted in the response "EGL_FALSE".

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
23455985cd wayland: Make MetaWaylandBuffer handle texture generation itself
Don't rely on the Cogl layer having Wayland specific paths by
determining the buffer type and creating the EGLImage ourself, while
using the newly exposed CoglTexture from EGLImage API. This changes the
API used by MetaWaylandSurface to make the MetaWaylandBuffer API be
aware when the buffer is being attached. For SHM and EGL buffers, only
the first time it is attached will result in a new texture being
allocated, but later for EGLStream's, more logic on every attach is
needed.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
659c987335 egl: Add helpers for importing Wayland buffers as EGLImage's
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
18b9cf8a85 egl: Allow passing NULL as error
When calling an EGL function is expected to sometimes fail, we might
not care about the error.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
934184e236 MetaRendererNative: Add EGLDevice based rendering support
This commit adds support for using a EGLDevice and EGLStreams for
rendering on top of KMS instead of gbm. It is disabled by default; to
enable it pass --enable-egl-device to configure.

By default gbm is first tried, and if it fails, the EGLDevice path is
tried. If both fails, mutter will terminate just as before.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
b735bdcf2f MetaEgl: Add EGL procs necessary for EGLDevice based rendering
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
b1597b4291 MetaOnscreenNative: Allocate for real after cogl_framebuffer_allocate
There is no way to pass any backend specific parameters to a
CoglFramebuffer until after it has been allocated by
cogl_framebuffer_allocate() (since this is where the winsys/platform
fields are initialized). This can make it hard to actually allocate
anything, if the platform depends on some backend specific data.

A proper solution would be to refactor the onscreens and framebuffers to
use a GObject based type system instead of the home baked Cogl one, but
that'll be left for another day. For now, allocate in two steps, one to
allocate the backend specific parts (MetaOnscreenNative), and one to
allocate the actual onscreen framebuffer (via
meta_onscreen_native_allocate()).

So far there is nothing that forces this separation, but in the future
there will, for example EGLDevice's need to know about the CRTC in
order to create the EGLSurface.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
faa96444b5 MetaRendererNative: Add helper for getting the next framebuffer id
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
78c121eb10 egl: Add eglInitialize helper
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
cb6adc45d1 MetaRendererNative: Warn instead of wait when swapping flip in progress
A swap-buffers should never be issued when we are waiting for a flipped
callback, so instead of trying to handle a situation that sholud never
happen, warn instead.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
59b4b5e9e8 MetaOnscreenNative: Make flip waiting state more generic
Use a boolean to keep track whether a flipped event is pending or not,
and use that instead of looking at the framebuffer id field.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
ad784501a6 backends/native: Don't set discarded framebuffer as current
When a swap failed with EACCES (possibly due to VT switching), don't
mark the framebuffer as 'in use', so that it'll be cleaned up properly
and not set as current.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
68d690225a MetaCursorRendererNative: Fall back to texture when there is no gbm
For when there is no gbm available, for example when using
EGLDevice/EGLStream's, just fall back to the OpenGL texture based
cursor rendering path.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
8f716772c2 cogl: Make platforms set the EGL_SURFACE_TYPE
Cogl has no way to know how to properly set the surface type, so lets
outsource that to the platform layer.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
da21f02eb9 MetaRendererNative: Always use eglGetPlatformDisplay
Drivers may be bad at guessing what is passed to eglGetDisplay, ending
up return non-functioning EGLDisplay's. Using eglGetPlatformDisplay
avoids this issue.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
4ce7d3a772 MetaRendererNative: Log error reason when failing to create gbm device
https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
77b7ecfd04 backends/native: Pass KMS file path to renderer
The KMS file path will later be used for EGLDevice based rendering.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
da1c1d9c22 MetaRendererNative: Use pbuffer surface as dummy surface
Lets use a pbuffer surface as a dummy surface instead of a gbm based
one, so that we don't need to rely on the availability of gbm to create
a dummy surface when there is no need for it.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
f7cd6af9c6 MetaRendererNative: Put gbm initialization in its own function
Separate gbm initialization from general renderer initialization. Do
this even though no other initialization is done for now; later there
will will be other types of rendering mode, initialized in their own
functions.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
678ebbb7f6 MetaRendererNative: Put gbm related things in an anonymous struct
In order to separate gbm related fields from generic ones, put them in
anonymous structs.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
87d6e45da5 MetaEgl: Add eglGetPlatformDisplayEXT helper
Prepare a helper function for the more reliable way to get a platform
display.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
80c61c4b3b MetaEgl: Add EGL extensions support
Add proc symbol loading and helper functions for calling them, dealing
with errors etc. So far no extension symbols are loaded, only the
infrastructure is there.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
4547c6e9f3 MetaLauncher: Remember the KMS file path
Not only keep the KMS fd around, also remember the file path used. This
will later be used when initializing a EGLDevice based renderer.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
cde622b8e1 MetaRendererNative: Get EGLDisplay on init
Use MetaEgl to get the EGLDisplay on initialization; use that when
constructing the Cogl renderer.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
8b810193dd MetaRendererNative: GLib:ify a few Cogl types
In another step getting rid of the duplications introduced by Cogl,
use the equivalent GLib types where Cogl types previously used. While
CoglBool is not a typedef to gboolean, they are both typedefs to int,
and we already use GLib's TRUE/FALSE to set them.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
22f019826c Add EGL abstraction class MetaEgl
Add a MetaEgl meant to deal with EGL. It is intended to be use by EGL
based renderers and handle extension symbols loading, handle errors etc.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00
Jonas Ådahl
7fa3f41df2 MetaBackendNative: Initialize GError pointer
Initialize the GError pointer used when creating the renderer. If an
error occurs, the error is expected to be NULL, otherwise it'll
misinterpreted as already set.

https://bugzilla.gnome.org/show_bug.cgi?id=773629
2016-11-18 00:00:10 +08:00