57d083730e
Implement ApplyConfiguration in terms of XRandR calls. Error checking is done before actually committing the configuration. If mutter is using one of the other monitor config backends, an error is reported and nothing happens. https://bugzilla.gnome.org/show_bug.cgi?id=705670
199 lines
8.4 KiB
XML
199 lines
8.4 KiB
XML
<!DOCTYPE node PUBLIC
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'-//freedesktop//DTD D-BUS Object Introspection 1.0//EN'
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'http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd'>
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<node>
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<!--
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org.gnome.Mutter.DisplayConfig:
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@short_description: display configuration interface
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This interface is used by mutter and gnome-settings-daemon
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to apply multiple monitor configuration.
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-->
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<interface name="org.gnome.Mutter.DisplayConfig">
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<!--
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GetResources:
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@serial: configuration serial
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@crtcs: available CRTCs
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@outputs: available outputs
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@modes: available modes
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@max_screen_width:
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@max_screen_height:
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Retrieves the current layout of the hardware.
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@serial is an unique identifier representing the current state
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of the screen. It must be passed back to ApplyConfiguration()
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and will be increased for every configuration change (so that
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mutter can detect that the new configuration is based on old
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state).
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A CRTC (CRT controller) is a logical monitor, ie a portion
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of the compositor coordinate space. It might correspond
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to multiple monitors, when in clone mode, but not that
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it is possible to implement clone mode also by setting different
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CRTCs to the same coordinates.
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The number of CRTCs represent the maximum number of monitors
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that can be set to expand and it is a HW constraint; if more
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monitors are connected, then necessarily some will clone. This
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is complementary to the concept of the encoder (not exposed in
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the API), which groups outputs that necessarily will show the
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same image (again a HW constraint).
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A CRTC is represented by a DBus structure with the following
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layout:
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* u ID: the ID in the API of this CRTC
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* x winsys_id: the low-level ID of this CRTC (which might
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be a XID, a KMS handle or something entirely
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different)
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* i x, y, width, height: the geometry of this CRTC
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(might be invalid if the CRTC is not in
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use)
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* i current_mode: the current mode of the CRTC, or -1 if this
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CRTC is not used
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Note: the size of the mode will always correspond
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to the width and height of the CRTC
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* u current_transform: the current transform (espressed according
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to the wayland protocol)
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* au transforms: all possible transforms
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* a{sv} properties: other high-level properties that affect this
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CRTC; they are not necessarily reflected in
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the hardware.
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No property is specified in this version of the API.
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FIXME: gamma?
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Note: all geometry information refers to the untransformed
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display.
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An output represents a physical screen, connected somewhere to
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the computer. Floating connectors are not exposed in the API.
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An output is a DBus struct with the following fields:
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* u ID: the ID in the API
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* x winsys_id: the low-level ID of this output (XID or KMS handle)
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* i current_crtc: the CRTC that is currently driving this output,
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or -1 if the output is disabled
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* au possible_crtcs: all CRTCs that can control this output
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* s name: the name of the connector to which the output is attached
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(like VGA1 or HDMI)
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* au modes: valid modes for this output
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* au clones: valid clones for this output, ie other outputs that
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can be assigned the same CRTC as this one; if you
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want to mirror two outputs that don't have each other
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in the clone list, you must configure two different
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CRTCs for the same geometry
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* a{sv} properties: other high-level properties that affect this
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output; they are not necessarily reflected in
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the hardware.
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Known properties:
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- "vendor" (s): (readonly) the human readable name
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of the manufacturer
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- "product" (s): (readonly) the human readable name
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of the display model
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- "serial" (s): (readonly) the serial number of this
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particular hardware part
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- "display-name" (s): (readonly) a human readable name
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of this output, to be shown in the UI
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- "primary" (b): whether this output is primary
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or not
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- "presentation" (b): whether this output is
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for presentation only
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Note: properties might be ignored if not consistenly
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applied to all outputs in the same clone group. In
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general, it's expected that presentation or primary
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outputs will not be cloned.
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A mode represents a set of parameters that are applied to
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each output, such as resolution and refresh rate. It is a separate
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object so that it can be referenced by CRTCs and outputs.
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Multiple outputs in the same CRTCs must all have the same mode.
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A mode is exposed as:
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* u ID: the ID in the API
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* x winsys_id: the low-level ID of this mode
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* u width, height: the resolution
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* d frequency: refresh rate
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Output and modes are read-only objects (except for output properties),
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they can change only in accordance to HW changes (such as hotplugging
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a monitor), while CRTCs can be changed with ApplyConfiguration().
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XXX: actually, if you insist enough, you can add new modes
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through xrandr command line or the KMS API, overriding what the
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kernel driver and the EDID say.
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Usually, it only matters with old cards with broken drivers, or
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old monitors with broken EDIDs, but it happens more often with
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projectors (if for example the kernel driver doesn't add the
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640x480 - 800x600 - 1024x768 default modes). Probably something
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that we need to handle in mutter anyway.
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-->
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<method name="GetResources">
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<arg name="serial" direction="out" type="u" />
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<arg name="crtcs" direction="out" type="a(uxiiiiiuaua{sv})" />
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<arg name="outputs" direction="out" type="a(uxiausauaua{sv})" />
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<arg name="modes" direction="out" type="a(uxuud)" />
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<arg name="max_screen_width" direction="out" type="i" />
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<arg name="max_screen_height" direction="out" type="i" />
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</method>
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<!--
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ApplyConfiguration:
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@serial: configuration serial
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@persistent: whether this configuration should be saved on disk
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@crtcs: new data for CRTCs
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@outputs: new data for outputs
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Applies the requested configuration changes.
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@serial must match the serial from the last GetResources() call,
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or org.freedesktop.DBus.AccessDenied will be generated.
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If @persistent is true, mutter will attempt to replicate this
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configuration the next time this HW layout appears.
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@crtcs represents the new logical configuration, as a list
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of structures containing:
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- u ID: the API ID from the corresponding GetResources() call
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- i new_mode: the API ID of the new mode to configure the CRTC
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with, or -1 if the CRTC should be disabled
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- i x, y: the new coordinates of the top left corner
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the geometry will be completed with the size information
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from @new_mode
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- u transform: the desired transform
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- au outputs: the API ID of outputs that should be assigned to
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this CRTC
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- a{sv} properties: properties whose value should be changed
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Note: CRTCs not referenced in the array will be disabled.
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@outputs represent the output property changes as:
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- u ID: the API ID of the output to change
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- a{sv} properties: properties whose value should be changed
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Note: both for CRTCs and outputs, properties not included in
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the dictionary will not be changed.
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Note: unrecognized properties will have no effect, but if the
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configuration change succeeds the property will be reported
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by the next GetResources() call, and if @persistent is true,
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it will also be saved to disk.
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If the configuration is invalid according to the previous
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GetResources() call, for example because a CRTC references
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an output it cannot drive, or not all outputs support the
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chosen mode, the error org.freedesktop.DBus.InvalidArgs will
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be generated.
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If the configuration cannot be applied for any other reason
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(eg. the screen size would exceed texture limits), the error
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org.freedesktop.DBus.Error.LimitsExceeded will be generated.
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-->
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<method name="ApplyConfiguration">
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<arg name="serial" direction="in" type="u" />
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<arg name="persistent" direction="in" type="b" />
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<arg name="crtcs" direction="in" type="a(uiiiuaua{sv})" />
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<arg name="outputs" direction="in" type="a(ua{sv})" />
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</method>
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</interface>
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</node>
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