/usr/include/mirclient/mir_toolkit/mir_display_configuration.h is in libmirclient-dev 0.21.0+16.04.20160330-0ubuntu1.
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* Copyright © 2016 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
*/
#ifndef MIR_TOOLKIT_MIR_DISPLAY_CONFIGURATION_H_
#define MIR_TOOLKIT_MIR_DISPLAY_CONFIGURATION_H_
#include "client_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* \addtogroup mir_toolkit
* @{
*/
/**
* A descriptor for a display mode.
*
* A display mode contains all the information necessary to drive a display. It
* includes resolution and refresh rate, but also pixel clock, vsync and hsync
* timings, and so on.
*/
typedef struct MirOutputMode MirOutputMode;
/**
* Release resources associated with a MirDisplayConfig handle.
*
* \param [in] config The handle to release
*/
void mir_display_config_release(MirDisplayConfig* config);
/**
* Get the maximum possible number of simultaneously active outputs this system
* supports.
*
* \note There may be restrictions on the configuration required to achieve this
* many active outputs. Typically the achievable number of simultaneously active
* outputs is lower than this number.
*
* \param [in] config The configuration to query
* \returns The maximum number of simultaneously active outputs
* supportable at this time.
*/
int mir_display_config_get_max_simultaneous_outputs(
MirDisplayConfig const* config);
/**
* Get the number of outputs available in this display configuration.
*
* This returns the total number of outputs the system has. This includes both
* enabled and disabled output connections, and is typically larger than the
* value returned from mir_display_config_get_max_simultaneous_outputs().
*
* Typically this will be constant over the lifetime of a client as devices
* usually do not gain extra physical ports at runtime. However, hotpluggable
* display devices exist and the number of virtual outputs may change at
* runtime, so this should always be called to determine the number of outputs
* to iterate over.
*
* \param [in] config The configuration to query
* \returns The number of outputs available in this configuration.
*/
int mir_display_config_get_num_outputs(MirDisplayConfig const* config);
/**
* Get a read-only handle to the index 'th output of this configuration
*
* \note The MirOutput handle is only valid while config is valid.
* \pre 0 <= index < mir_display_config_get_num_outputs(config)
* \param [in] config The configuration to query
* \param [in] index The index of the output to get
* \returns A read-only handle to a MirOutput within config which is valid
* until mir_display_config_release(config) is called.
*/
MirOutput const* mir_display_config_get_output(MirDisplayConfig const* config,
size_t index);
/**
* Get the number of modes in the supported mode list of this output.
*
* The list of supported modes is retrieved from the hardware, possibly modified
* by any applicable quirk tables, and may not be exhaustive.
*
* \param [in] output The MirOutput to query
* \returns The number of modes in the supported mode list of output.
*/
int mir_output_get_num_modes(MirOutput const* output);
/**
* Get a handle for a mode descriptor from the list of supported modes.
*
* The list of supported modes is retrieved from the hardware, possibly modified
* by any applicable quirk tables, and may not be exhaustive.
*
* \pre 0 <= index < mir_output_get_num_modes(output)
* \note The handle remains valid as long as output is valid.
*
* \param [in] output The MirOutput to query
* \param [in] index The index of the mode to retrieve.
* \returns A handle for a description of the supported mode. This is valid
* for as long as output is valid. The return value is never null.
*/
MirOutputMode const* mir_output_get_mode(MirOutput const* output, size_t index);
/**
* Get a handle to the output's preferred mode.
*
* This is provided by the output itself. For modern displays (LCD, OLED, etc)
* it is typically a mode with the native resolution.
*
* An output may not have a preferred mode, in which case this call will return
* NULL.
*
* \note The handle remains valid as long as output is valid.
*
* \param [in] output The MirOutput to query
* \returns A handle for a description of the supported mode. This is valid
* for as long as output is valid. If the output does not have a
* preferred mode, it returns NULL.
*/
MirOutputMode const* mir_output_get_preferred_mode(MirOutput const* output);
/**
* Get a handle to the output's current mode.
*
* An output may not have a current mode (for example, if it is disabled), in
* which case this call will return NULL.
*
* \note The handle remains valid as long as output is valid.
*
* \param [in] output The MirOutput to query
* \returns A handle for a description of the supported mode. This is valid
* for as long as output is valid. If the output does not have a
* current mode, it returns NULL.
*/
MirOutputMode const* mir_output_get_current_mode(MirOutput const* output);
/**
* Get the number of pixel formats supported by this output
*
* \param [in] output The MirOutput to query
* \returns The number of pixel formats for output.
*/
int mir_output_get_num_pixel_formats(MirOutput const* output);
/**
* Get a pixel format from the list of supported formats
*
* \pre 0 <= index < mir_output_get_num_pixel_formats(output)
*
* \param [in] output The MirOutput to query
* \param [in] index The index of the format to query
* \returns The index 'th supported pixel format.
*/
MirPixelFormat mir_output_get_pixel_format(MirOutput const* output,
size_t index);
/**
* Get the current pixel format.
*
* \param [in] output The MirOutput to query
* \returns The current pixel format. This may be mir_pixel_format_invalid
* (for example, if the output is not currently enabled).
*/
MirPixelFormat mir_output_get_current_pixel_format(MirOutput const* output);
/**
* Set the output format
*
* \param [in] output The MirOutput to modify
* \param [in] format The MirPixelFormat to set
*/
void mir_output_set_pixel_format(MirOutput* output, MirPixelFormat format);
/**
* Get the ID of an output
*
* This can be used to refer to the output in other parts of the API, such as
* mir_surface_spec_set_fullscreen_on_output().
*
* \param [in] output The MirOutput to query.
* \returns The ID of output, which may be used to refer to it in other
* parts of the API.
*/
int mir_output_get_id(MirOutput const* output);
/**
* Get the physical connection type of an output.
*
* This is a best-effort determination, and may be incorrect.
*
* \param [in] output The MirOutput to query
* \returns The type of the display connection, or mir_output_type_unknown
* if it cannot be determined.
*/
MirOutputType mir_output_get_type(MirOutput const* output);
/**
* Get the x coordinate of the top-left point of the output in the virtual
* display space.
*
* Outputs can be thought of as viewports into a virtual display space. They may
* freely overlap, coincide, or be disjoint as desired.
*
* Output orientation changes the orientation of the output rectangle in virtual
* display space, but does not change its top-left corner.
*
* \param [in] output The MirOutput to query
* \returns The x coordinate of the top-left point of the output in the
* virtual display space.
*/
int mir_output_get_position_x(MirOutput const* output);
/**
* Get the y coordinate of the top-left point of the output in the virtual
* display space.
*
* Outputs can be thought of as viewports into a virtual display space. They may
* freely overlap, coincide, or be disjoint as desired.
*
* Output orientation changes the orientation of the output rectangle in virtual
* display space, but does not change its top-left corner.
*
* \param [in] output The MirOutput to query
* \returns The y coordinate of the top-left point of the output in the
* virtual display space.
*/
int mir_output_get_position_y(MirOutput const* output);
/**
* Get whether there is a display physically connected to the output.
*
* This gives a best-effort determination of whether or not enabling this output
* will result in an image being displayed to the user.
*
* The accuracy of this determination varies with connection type - for example,
* for DisplayPort and HDMI connections a return value of
* mir_output_connection_state_connected is usually a reliable indicator that
* there is a powered-on display connected.
*
* VGA and DVI connectors can usually determine whether or not there is a
* physically connected display, but cannot distinguish between a powered or
* unpowered display.
*
* It is not always possible to determine whether or not there is a display
* connected; in such cases mir_output_connection_state_unknown is returned.
*
* \param [in] output The MirOutput to query
* \returns Whether there is a display connected to this output.
*/
MirOutputConnectionState mir_output_get_connection_state(
MirOutput const* output);
/**
* Get whether this output is enabled in the current configuration.
*
* \param [in] output the MirOutput to query
* \returns Whether the output is enabled.
*/
bool mir_output_is_enabled(MirOutput const* output);
/**
* Get the physical width of the connected display, in millimetres.
*
* A best-effort report of the physical width of the display connected to this
* output. This is retrieved from the display hardware, possibly modified by any
* applicable quirk tables.
*
* Where this information is unavailable or inapplicable (for example,
* projectors), 0 is returned.
*
* \param [in] output the MirOutput to query
* \returns Physical width of the connected display, in mm.
*/
int mir_output_get_physical_width_mm(MirOutput const* output);
/**
* Get the physical height of the connected display, in millimetres.
*
* A best-effort report of the physical height of the display connected to this
* output. This is retrieved from the display hardware, possibly modified by any
* applicable quirk tables.
*
* Where this information is unavailable or inapplicable (for example,
* projectors), 0 is returned.
*
* \param [in] output the MirOutput to query
* \returns Physical height of the connected display, in mm.
*/
int mir_output_get_physical_height_mm(MirOutput const* output);
/**
* Get the power state of a connected display.
*
* It is undefined which power state is returned for an output which is not
* connected.
*
* \param [in] output The MirOutput to query
* \returns The power state of the display connected to output.
*/
MirPowerMode mir_output_get_power_mode(MirOutput const* output);
/**
* Get the orientation of a display.
*
* \param [in] output The MirOutput to query
* \returns The orientation of output
*/
MirOrientation mir_output_get_orientation(MirOutput const* output);
/**
* Get the scale-factor of a display
*
* The scale-factor specifies the conversion between logical pixels and physical pixels on this output.
*
* A surface with dimensions 200×100 on an output with scale-factor 2.0 will display 400x200 pixels
* on this output, will display 300x150 pixels on an output with scale-factor 1.5, and so on.
*
* Where this calculation would result in a fractional number of pixels the floor is used, so a surface with
* dimensions 101x100 on an output with scale-factor of 1.5 will display 151x150 pixels, not 152x150.
*
* \param [in] output The MirOutput to query
* \returns The scale-factor of this monitor
*/
float mir_output_get_scale_factor(MirOutput const* output);
/**
* Get the form-factor of a connected output.
*
* This call succeeds even if the output is not connected, but may return nonsense values.
*
* \param [in] output The MirOutput to query
* \returns The form factor of this output
*/
MirFormFactor mir_output_get_form_factor(MirOutput const* output);
/**
* Get the width, in pixels, of a MirOutputMode
*
* \note This is unaffected by the orientation of the output
*
* \param [in] mode The MirOutputMode to query
* \returns The width, in pixels, of mode.
*/
int mir_output_mode_get_width(MirOutputMode const* mode);
/** Get the height, in pixels, of a MirOutputMode
*
* \note This is unaffected by the orientation of the output
*
* \param [in] mode The MirOutputMode to query
* \returns The height, in pixels, of mode.
*/
int mir_output_mode_get_height(MirOutputMode const* mode);
/** Get the refresh rate, in Hz, of a MirOutputMode
*
* \param [in] mode The MirOutputMode to query
* \returns The refresh rate, in Hz, of mode
*/
double mir_output_mode_get_refresh_rate(MirOutputMode const* mode);
/**@}*/
#ifdef __cplusplus
}
#endif
#endif //MIR_TOOLKIT_MIR_DISPLAY_CONFIGURATION_H_
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