source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.15.0/xf86Crtc.h@ 78293

/*
 * Copyright © 2006 Keith Packard
 * Copyright © 2011 Aaron Plattner
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */
#ifndef _XF86CRTC_H_
#define _XF86CRTC_H_

#include <edid.h>
#include "randrstr.h"
#include "xf86Modes.h"
#include "xf86Cursor.h"
#include "xf86i2c.h"
#include "damage.h"
#include "picturestr.h"

/* Compat definitions for older X Servers. */
#ifndef M_T_PREFERRED
#define M_T_PREFERRED   0x08
#endif
#ifndef M_T_DRIVER
#define M_T_DRIVER      0x40
#endif
#ifndef M_T_USERPREF
#define M_T_USERPREF    0x80
#endif
#ifndef HARDWARE_CURSOR_ARGB
#define HARDWARE_CURSOR_ARGB                            0x00004000
#endif

typedef struct _xf86Crtc xf86CrtcRec, *xf86CrtcPtr;
typedef struct _xf86Output xf86OutputRec, *xf86OutputPtr;

/* define a standard for connector types */
typedef enum _xf86ConnectorType {
    XF86ConnectorNone,
    XF86ConnectorVGA,
    XF86ConnectorDVI_I,
    XF86ConnectorDVI_D,
    XF86ConnectorDVI_A,
    XF86ConnectorComposite,
    XF86ConnectorSvideo,
    XF86ConnectorComponent,
    XF86ConnectorLFP,
    XF86ConnectorProprietary,
    XF86ConnectorHDMI,
    XF86ConnectorDisplayPort,
} xf86ConnectorType;

typedef enum _xf86OutputStatus {
    XF86OutputStatusConnected,
    XF86OutputStatusDisconnected,
    XF86OutputStatusUnknown
} xf86OutputStatus;

typedef struct _xf86CrtcFuncs {
   /**
    * Turns the crtc on/off, or sets intermediate power levels if available.
    *
    * Unsupported intermediate modes drop to the lower power setting.  If the
    * mode is DPMSModeOff, the crtc must be disabled sufficiently for it to
    * be safe to call mode_set.
    */
    void
     (*dpms) (xf86CrtcPtr crtc, int mode);

   /**
    * Saves the crtc's state for restoration on VT switch.
    */
    void
     (*save) (xf86CrtcPtr crtc);

   /**
    * Restore's the crtc's state at VT switch.
    */
    void
     (*restore) (xf86CrtcPtr crtc);

    /**
     * Lock CRTC prior to mode setting, mostly for DRI.
     * Returns whether unlock is needed
     */
    Bool
     (*lock) (xf86CrtcPtr crtc);

    /**
     * Unlock CRTC after mode setting, mostly for DRI
     */
    void
     (*unlock) (xf86CrtcPtr crtc);

    /**
     * Callback to adjust the mode to be set in the CRTC.
     *
     * This allows a CRTC to adjust the clock or even the entire set of
     * timings, which is used for panels with fixed timings or for
     * buses with clock limitations.
     */
    Bool
     (*mode_fixup) (xf86CrtcPtr crtc,
                    DisplayModePtr mode, DisplayModePtr adjusted_mode);

    /**
     * Prepare CRTC for an upcoming mode set.
     */
    void
     (*prepare) (xf86CrtcPtr crtc);

    /**
     * Callback for setting up a video mode after fixups have been made.
     */
    void
     (*mode_set) (xf86CrtcPtr crtc,
                  DisplayModePtr mode,
                  DisplayModePtr adjusted_mode, int x, int y);

    /**
     * Commit mode changes to a CRTC
     */
    void
     (*commit) (xf86CrtcPtr crtc);

    /* Set the color ramps for the CRTC to the given values. */
    void
     (*gamma_set) (xf86CrtcPtr crtc, CARD16 *red, CARD16 *green, CARD16 *blue,
                   int size);

    /**
     * Allocate the shadow area, delay the pixmap creation until needed
     */
    void *(*shadow_allocate) (xf86CrtcPtr crtc, int width, int height);

    /**
     * Create shadow pixmap for rotation support
     */
    PixmapPtr
     (*shadow_create) (xf86CrtcPtr crtc, void *data, int width, int height);

    /**
     * Destroy shadow pixmap
     */
    void
     (*shadow_destroy) (xf86CrtcPtr crtc, PixmapPtr pPixmap, void *data);

    /**
     * Set cursor colors
     */
    void
     (*set_cursor_colors) (xf86CrtcPtr crtc, int bg, int fg);

    /**
     * Set cursor position
     */
    void
     (*set_cursor_position) (xf86CrtcPtr crtc, int x, int y);

    /**
     * Show cursor
     */
    void
     (*show_cursor) (xf86CrtcPtr crtc);

    /**
     * Hide cursor
     */
    void
     (*hide_cursor) (xf86CrtcPtr crtc);

    /**
     * Load monochrome image
     */
    void
     (*load_cursor_image) (xf86CrtcPtr crtc, CARD8 *image);

    /**
     * Load ARGB image
     */
    void
     (*load_cursor_argb) (xf86CrtcPtr crtc, CARD32 *image);

    /**
     * Clean up driver-specific bits of the crtc
     */
    void
     (*destroy) (xf86CrtcPtr crtc);

    /**
     * Less fine-grained mode setting entry point for kernel modesetting
     */
    Bool
     (*set_mode_major) (xf86CrtcPtr crtc, DisplayModePtr mode,
                        Rotation rotation, int x, int y);

    /**
     * Callback for panning. Doesn't change the mode.
     * Added in ABI version 2
     */
    void
     (*set_origin) (xf86CrtcPtr crtc, int x, int y);

    /**
     */
    Bool
    (*set_scanout_pixmap)(xf86CrtcPtr crtc, PixmapPtr pixmap);

} xf86CrtcFuncsRec, *xf86CrtcFuncsPtr;

#define XF86_CRTC_VERSION 5

struct _xf86Crtc {
    /**
     * ABI versioning
     */
    int version;

    /**
     * Associated ScrnInfo
     */
    ScrnInfoPtr scrn;

    /**
     * Desired state of this CRTC
     *
     * Set when this CRTC should be driving one or more outputs 
     */
    Bool enabled;

    /**
     * Active mode
     *
     * This reflects the mode as set in the CRTC currently
     * It will be cleared when the VT is not active or
     * during server startup
     */
    DisplayModeRec mode;
    Rotation rotation;
    PixmapPtr rotatedPixmap;
    void *rotatedData;

    /**
     * Position on screen
     *
     * Locates this CRTC within the frame buffer
     */
    int x, y;

    /**
     * Desired mode
     *
     * This is set to the requested mode, independent of
     * whether the VT is active. In particular, it receives
     * the startup configured mode and saves the active mode
     * on VT switch.
     */
    DisplayModeRec desiredMode;
    Rotation desiredRotation;
    int desiredX, desiredY;

    /** crtc-specific functions */
    const xf86CrtcFuncsRec *funcs;

    /**
     * Driver private
     *
     * Holds driver-private information
     */
    void *driver_private;

#ifdef RANDR_12_INTERFACE
    /**
     * RandR crtc
     *
     * When RandR 1.2 is available, this
     * points at the associated crtc object
     */
    RRCrtcPtr randr_crtc;
#else
    void *randr_crtc;
#endif

    /**
     * Current cursor is ARGB
     */
    Bool cursor_argb;
    /**
     * Track whether cursor is within CRTC range 
     */
    Bool cursor_in_range;
    /**
     * Track state of cursor associated with this CRTC
     */
    Bool cursor_shown;

    /**
     * Current transformation matrix
     */
    PictTransform crtc_to_framebuffer;
    /* framebuffer_to_crtc was removed in ABI 2 */
    struct pict_f_transform f_crtc_to_framebuffer;      /* ABI 2 */
    struct pict_f_transform f_framebuffer_to_crtc;      /* ABI 2 */
    PictFilterPtr filter;       /* ABI 2 */
    xFixed *params;             /* ABI 2 */
    int nparams;                /* ABI 2 */
    int filter_width;           /* ABI 2 */
    int filter_height;          /* ABI 2 */
    Bool transform_in_use;
    RRTransformRec transform;   /* ABI 2 */
    Bool transformPresent;      /* ABI 2 */
    RRTransformRec desiredTransform;    /* ABI 2 */
    Bool desiredTransformPresent;       /* ABI 2 */
    /**
     * Bounding box in screen space
     */
    BoxRec bounds;
    /**
     * Panning:
     * TotalArea: total panning area, larger than CRTC's size
     * TrackingArea: Area of the pointer for which the CRTC is panned
     * border: Borders of the displayed CRTC area which induces panning if the pointer reaches them
     * Added in ABI version 2
     */
    BoxRec panningTotalArea;
    BoxRec panningTrackingArea;
    INT16 panningBorder[4];

    /**
     * Current gamma, especially useful after initial config.
     * Added in ABI version 3
     */
    CARD16 *gamma_red;
    CARD16 *gamma_green;
    CARD16 *gamma_blue;
    int gamma_size;

    /**
     * Actual state of this CRTC
     *
     * Set to TRUE after modesetting, set to FALSE if no outputs are connected
     * Added in ABI version 3
     */
    Bool active;
    /**
     * Clear the shadow
     */
    Bool shadowClear;

    /**
     * Indicates that the driver is handling the transform, so the shadow
     * surface should be disabled.  The driver writes this field before calling
     * xf86CrtcRotate to indicate that it is handling the transform (including
     * rotation and reflection).
     *
     * Setting this flag also causes the server to stop adjusting the cursor
     * image and position.
     *
     * Added in ABI version 4
     */
    Bool driverIsPerformingTransform;

    /* Added in ABI version 5
     */
    PixmapPtr current_scanout;
};

typedef struct _xf86OutputFuncs {
    /**
     * Called to allow the output a chance to create properties after the
     * RandR objects have been created.
     */
    void
     (*create_resources) (xf86OutputPtr output);

    /**
     * Turns the output on/off, or sets intermediate power levels if available.
     *
     * Unsupported intermediate modes drop to the lower power setting.  If the
     * mode is DPMSModeOff, the output must be disabled, as the DPLL may be
     * disabled afterwards.
     */
    void
     (*dpms) (xf86OutputPtr output, int mode);

    /**
     * Saves the output's state for restoration on VT switch.
     */
    void
     (*save) (xf86OutputPtr output);

    /**
     * Restore's the output's state at VT switch.
     */
    void
     (*restore) (xf86OutputPtr output);

    /**
     * Callback for testing a video mode for a given output.
     *
     * This function should only check for cases where a mode can't be supported
     * on the output specifically, and not represent generic CRTC limitations.
     *
     * \return MODE_OK if the mode is valid, or another MODE_* otherwise.
     */
    int
     (*mode_valid) (xf86OutputPtr output, DisplayModePtr pMode);

    /**
     * Callback to adjust the mode to be set in the CRTC.
     *
     * This allows an output to adjust the clock or even the entire set of
     * timings, which is used for panels with fixed timings or for
     * buses with clock limitations.
     */
    Bool
     (*mode_fixup) (xf86OutputPtr output,
                    DisplayModePtr mode, DisplayModePtr adjusted_mode);

    /**
     * Callback for preparing mode changes on an output
     */
    void
     (*prepare) (xf86OutputPtr output);

    /**
     * Callback for committing mode changes on an output
     */
    void
     (*commit) (xf86OutputPtr output);

    /**
     * Callback for setting up a video mode after fixups have been made.
     *
     * This is only called while the output is disabled.  The dpms callback
     * must be all that's necessary for the output, to turn the output on
     * after this function is called.
     */
    void
     (*mode_set) (xf86OutputPtr output,
                  DisplayModePtr mode, DisplayModePtr adjusted_mode);

    /**
     * Probe for a connected output, and return detect_status.
     */
     xf86OutputStatus(*detect) (xf86OutputPtr output);

    /**
     * Query the device for the modes it provides.
     *
     * This function may also update MonInfo, mm_width, and mm_height.
     *
     * \return singly-linked list of modes or NULL if no modes found.
     */
     DisplayModePtr(*get_modes) (xf86OutputPtr output);

#ifdef RANDR_12_INTERFACE
    /**
     * Callback when an output's property has changed.
     */
    Bool
     (*set_property) (xf86OutputPtr output,
                      Atom property, RRPropertyValuePtr value);
#endif
#ifdef RANDR_13_INTERFACE
    /**
     * Callback to get an updated property value
     */
    Bool
     (*get_property) (xf86OutputPtr output, Atom property);
#endif
#ifdef RANDR_GET_CRTC_INTERFACE
    /**
     * Callback to get current CRTC for a given output
     */
     xf86CrtcPtr(*get_crtc) (xf86OutputPtr output);
#endif
    /**
     * Clean up driver-specific bits of the output
     */
    void
     (*destroy) (xf86OutputPtr output);
} xf86OutputFuncsRec, *xf86OutputFuncsPtr;

#define XF86_OUTPUT_VERSION 2

struct _xf86Output {
    /**
     * ABI versioning
     */
    int version;

    /**
     * Associated ScrnInfo
     */
    ScrnInfoPtr scrn;

    /**
     * Currently connected crtc (if any)
     *
     * If this output is not in use, this field will be NULL.
     */
    xf86CrtcPtr crtc;

    /**
     * Possible CRTCs for this output as a mask of crtc indices
     */
    CARD32 possible_crtcs;

    /**
     * Possible outputs to share the same CRTC as a mask of output indices
     */
    CARD32 possible_clones;

    /**
     * Whether this output can support interlaced modes
     */
    Bool interlaceAllowed;

    /**
     * Whether this output can support double scan modes
     */
    Bool doubleScanAllowed;

    /**
     * List of available modes on this output.
     *
     * This should be the list from get_modes(), plus perhaps additional
     * compatible modes added later.
     */
    DisplayModePtr probed_modes;

    /**
     * Options parsed from the related monitor section
     */
    OptionInfoPtr options;

    /**
     * Configured monitor section
     */
    XF86ConfMonitorPtr conf_monitor;

    /**
     * Desired initial position
     */
    int initial_x, initial_y;

    /**
     * Desired initial rotation
     */
    Rotation initial_rotation;

    /**
     * Current connection status
     *
     * This indicates whether a monitor is known to be connected
     * to this output or not, or whether there is no way to tell
     */
    xf86OutputStatus status;

    /** EDID monitor information */
    xf86MonPtr MonInfo;

    /** subpixel order */
    int subpixel_order;

    /** Physical size of the currently attached output device. */
    int mm_width, mm_height;

    /** Output name */
    char *name;

    /** output-specific functions */
    const xf86OutputFuncsRec *funcs;

    /** driver private information */
    void *driver_private;

    /** Whether to use the old per-screen Monitor config section */
    Bool use_screen_monitor;

#ifdef RANDR_12_INTERFACE
    /**
     * RandR 1.2 output structure.
     *
     * When RandR 1.2 is available, this points at the associated
     * RandR output structure and is created when this output is created
     */
    RROutputPtr randr_output;
#else
    void *randr_output;
#endif
    /** 
     * Desired initial panning
     * Added in ABI version 2
     */
    BoxRec initialTotalArea;
    BoxRec initialTrackingArea;
    INT16 initialBorder[4];
};

typedef struct _xf86ProviderFuncs {
    /**
     * Called to allow the provider a chance to create properties after the
     * RandR objects have been created.
     */
    void
    (*create_resources) (ScrnInfoPtr scrn);

    /**
     * Callback when an provider's property has changed.
     */
    Bool
    (*set_property) (ScrnInfoPtr scrn,
                     Atom property, RRPropertyValuePtr value);

    /**
     * Callback to get an updated property value
     */
    Bool
    (*get_property) (ScrnInfoPtr provider, Atom property);

} xf86ProviderFuncsRec, *xf86ProviderFuncsPtr;

typedef struct _xf86CrtcConfigFuncs {
    /**
     * Requests that the driver resize the screen.
     *
     * The driver is responsible for updating scrn->virtualX and scrn->virtualY.
     * If the requested size cannot be set, the driver should leave those values
     * alone and return FALSE.
     *
     * A naive driver that cannot reallocate the screen may simply change
     * virtual[XY].  A more advanced driver will want to also change the
     * devPrivate.ptr and devKind of the screen pixmap, update any offscreen
     * pixmaps it may have moved, and change pScrn->displayWidth.
     */
    Bool
     (*resize) (ScrnInfoPtr scrn, int width, int height);
} xf86CrtcConfigFuncsRec, *xf86CrtcConfigFuncsPtr;

typedef void (*xf86_crtc_notify_proc_ptr) (ScreenPtr pScreen);

typedef struct _xf86CrtcConfig {
    int num_output;
    xf86OutputPtr *output;
    /**
     * compat_output is used whenever we deal
     * with legacy code that only understands a single
     * output. pScrn->modes will be loaded from this output,
     * adjust frame will whack this output, etc.
     */
    int compat_output;

    int num_crtc;
    xf86CrtcPtr *crtc;

    int minWidth, minHeight;
    int maxWidth, maxHeight;

    /* For crtc-based rotation */
    DamagePtr rotation_damage;
    Bool rotation_damage_registered;

    /* DGA */
    unsigned int dga_flags;
    unsigned long dga_address;
    DGAModePtr dga_modes;
    int dga_nmode;
    int dga_width, dga_height, dga_stride;
    DisplayModePtr dga_save_mode;

    const xf86CrtcConfigFuncsRec *funcs;

    CreateScreenResourcesProcPtr CreateScreenResources;

    CloseScreenProcPtr CloseScreen;

    /* Cursor information */
    xf86CursorInfoPtr cursor_info;
    CursorPtr cursor;
    CARD8 *cursor_image;
    Bool cursor_on;
    CARD32 cursor_fg, cursor_bg;

    /**
     * Options parsed from the related device section
     */
    OptionInfoPtr options;

    Bool debug_modes;

    /* wrap screen BlockHandler for rotation */
    ScreenBlockHandlerProcPtr BlockHandler;

    /* callback when crtc configuration changes */
    xf86_crtc_notify_proc_ptr xf86_crtc_notify;

    char *name;
    const xf86ProviderFuncsRec *provider_funcs;
#ifdef RANDR_12_INTERFACE
    RRProviderPtr randr_provider;
#else
    void *randr_provider;
#endif
} xf86CrtcConfigRec, *xf86CrtcConfigPtr;

extern _X_EXPORT int xf86CrtcConfigPrivateIndex;

#define XF86_CRTC_CONFIG_PTR(p) ((xf86CrtcConfigPtr) ((p)->privates[xf86CrtcConfigPrivateIndex].ptr))

static _X_INLINE xf86OutputPtr
xf86CompatOutput(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);

    return config->output[config->compat_output];
}

static _X_INLINE xf86CrtcPtr
xf86CompatCrtc(ScrnInfoPtr pScrn)
{
    xf86OutputPtr compat_output = xf86CompatOutput(pScrn);

    if (!compat_output)
        return NULL;
    return compat_output->crtc;
}

static _X_INLINE RRCrtcPtr
xf86CompatRRCrtc(ScrnInfoPtr pScrn)
{
    xf86CrtcPtr compat_crtc = xf86CompatCrtc(pScrn);

    if (!compat_crtc)
        return NULL;
    return compat_crtc->randr_crtc;
}

/*
 * Initialize xf86CrtcConfig structure
 */

extern _X_EXPORT void
 xf86CrtcConfigInit(ScrnInfoPtr scrn, const xf86CrtcConfigFuncsRec * funcs);

extern _X_EXPORT void

xf86CrtcSetSizeRange(ScrnInfoPtr scrn,
                     int minWidth, int minHeight, int maxWidth, int maxHeight);

/*
 * Crtc functions
 */
extern _X_EXPORT xf86CrtcPtr
xf86CrtcCreate(ScrnInfoPtr scrn, const xf86CrtcFuncsRec * funcs);

extern _X_EXPORT void
 xf86CrtcDestroy(xf86CrtcPtr crtc);

/**
 * Sets the given video mode on the given crtc
 */

extern _X_EXPORT Bool

xf86CrtcSetModeTransform(xf86CrtcPtr crtc, DisplayModePtr mode,
                         Rotation rotation, RRTransformPtr transform, int x,
                         int y);

extern _X_EXPORT Bool

xf86CrtcSetMode(xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
                int x, int y);

extern _X_EXPORT void
 xf86CrtcSetOrigin(xf86CrtcPtr crtc, int x, int y);

/*
 * Assign crtc rotation during mode set
 */
extern _X_EXPORT Bool
 xf86CrtcRotate(xf86CrtcPtr crtc);

/*
 * Clean up any rotation data, used when a crtc is turned off
 * as well as when rotation is disabled.
 */
extern _X_EXPORT void
 xf86RotateDestroy(xf86CrtcPtr crtc);

/*
 * free shadow memory allocated for all crtcs
 */
extern _X_EXPORT void
 xf86RotateFreeShadow(ScrnInfoPtr pScrn);

/*
 * Clean up rotation during CloseScreen
 */
extern _X_EXPORT void
 xf86RotateCloseScreen(ScreenPtr pScreen);

/**
 * Return whether any output is assigned to the crtc
 */
extern _X_EXPORT Bool
 xf86CrtcInUse(xf86CrtcPtr crtc);

/*
 * Output functions
 */
extern _X_EXPORT xf86OutputPtr
xf86OutputCreate(ScrnInfoPtr scrn,
                 const xf86OutputFuncsRec * funcs, const char *name);

extern _X_EXPORT void
 xf86OutputUseScreenMonitor(xf86OutputPtr output, Bool use_screen_monitor);

extern _X_EXPORT Bool
 xf86OutputRename(xf86OutputPtr output, const char *name);

extern _X_EXPORT void
 xf86OutputDestroy(xf86OutputPtr output);

extern _X_EXPORT void
 xf86ProbeOutputModes(ScrnInfoPtr pScrn, int maxX, int maxY);

extern _X_EXPORT void
 xf86SetScrnInfoModes(ScrnInfoPtr pScrn);

#ifdef RANDR_13_INTERFACE
#define ScreenInitRetType       int
#else
#define ScreenInitRetType       Bool
#endif

extern _X_EXPORT ScreenInitRetType xf86CrtcScreenInit(ScreenPtr pScreen);

extern _X_EXPORT Bool
 xf86InitialConfiguration(ScrnInfoPtr pScrn, Bool canGrow);

extern _X_EXPORT void
 xf86DPMSSet(ScrnInfoPtr pScrn, int PowerManagementMode, int flags);

extern _X_EXPORT Bool
 xf86SaveScreen(ScreenPtr pScreen, int mode);

extern _X_EXPORT void
 xf86DisableUnusedFunctions(ScrnInfoPtr pScrn);

extern _X_EXPORT DisplayModePtr
xf86OutputFindClosestMode(xf86OutputPtr output, DisplayModePtr desired);

extern _X_EXPORT Bool

xf86SetSingleMode(ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation);

/**
 * Set the EDID information for the specified output
 */
extern _X_EXPORT void
 xf86OutputSetEDID(xf86OutputPtr output, xf86MonPtr edid_mon);

/**
 * Return the list of modes supported by the EDID information
 * stored in 'output'
 */
extern _X_EXPORT DisplayModePtr xf86OutputGetEDIDModes(xf86OutputPtr output);

extern _X_EXPORT xf86MonPtr
xf86OutputGetEDID(xf86OutputPtr output, I2CBusPtr pDDCBus);

/**
 * Initialize dga for this screen
 */

#ifdef XFreeXDGA
extern _X_EXPORT Bool
 xf86DiDGAInit(ScreenPtr pScreen, unsigned long dga_address);

/* this is the real function, used only internally */
_X_INTERNAL Bool
 _xf86_di_dga_init_internal(ScreenPtr pScreen);

/**
 * Re-initialize dga for this screen (as when the set of modes changes)
 */

extern _X_EXPORT Bool
 xf86DiDGAReInit(ScreenPtr pScreen);
#endif

/* This is the real function, used only internally */
_X_INTERNAL Bool
 _xf86_di_dga_reinit_internal(ScreenPtr pScreen);

/*
 * Set the subpixel order reported for the screen using
 * the information from the outputs
 */

extern _X_EXPORT void
 xf86CrtcSetScreenSubpixelOrder(ScreenPtr pScreen);

/*
 * Get a standard string name for a connector type 
 */
extern _X_EXPORT const char *xf86ConnectorGetName(xf86ConnectorType connector);

/*
 * Using the desired mode information in each crtc, set
 * modes (used in EnterVT functions, or at server startup)
 */

extern _X_EXPORT Bool
 xf86SetDesiredModes(ScrnInfoPtr pScrn);

/**
 * Initialize the CRTC-based cursor code. CRTC function vectors must
 * contain relevant cursor setting functions.
 *
 * Driver should call this from ScreenInit function
 */
extern _X_EXPORT Bool
 xf86_cursors_init(ScreenPtr screen, int max_width, int max_height, int flags);

/**
 * Called when anything on the screen is reconfigured.
 *
 * Reloads cursor images as needed, then adjusts cursor positions.
 * 
 * Driver should call this from crtc commit function.
 */
extern _X_EXPORT void
 xf86_reload_cursors(ScreenPtr screen);

/**
 * Called from EnterVT to turn the cursors back on
 */
extern _X_EXPORT void
 xf86_show_cursors(ScrnInfoPtr scrn);

/**
 * Called by the driver to turn cursors off
 */
extern _X_EXPORT void
 xf86_hide_cursors(ScrnInfoPtr scrn);

/**
 * Clean up CRTC-based cursor code. Driver must call this at CloseScreen time.
 */
extern _X_EXPORT void
 xf86_cursors_fini(ScreenPtr screen);

/**
 * Transform the cursor's coordinates based on the crtc transform.  Normally
 * this is done by the server, but if crtc->driverIsPerformingTransform is TRUE,
 * then the server does not transform the cursor position automatically.
 */
extern _X_EXPORT void
 xf86CrtcTransformCursorPos(xf86CrtcPtr crtc, int *x, int *y);

#ifdef XV
/*
 * For overlay video, compute the relevant CRTC and
 * clip video to that.
 * wraps xf86XVClipVideoHelper()
 */

extern _X_EXPORT Bool

xf86_crtc_clip_video_helper(ScrnInfoPtr pScrn,
                            xf86CrtcPtr * crtc_ret,
                            xf86CrtcPtr desired_crtc,
                            BoxPtr dst,
                            INT32 *xa,
                            INT32 *xb,
                            INT32 *ya,
                            INT32 *yb,
                            RegionPtr reg, INT32 width, INT32 height);
#endif

extern _X_EXPORT xf86_crtc_notify_proc_ptr
xf86_wrap_crtc_notify(ScreenPtr pScreen, xf86_crtc_notify_proc_ptr new);

extern _X_EXPORT void
 xf86_unwrap_crtc_notify(ScreenPtr pScreen, xf86_crtc_notify_proc_ptr old);

extern _X_EXPORT void
 xf86_crtc_notify(ScreenPtr pScreen);

/**
 * Gamma
 */

extern _X_EXPORT Bool
 xf86_crtc_supports_gamma(ScrnInfoPtr pScrn);

extern _X_EXPORT void
xf86ProviderSetup(ScrnInfoPtr scrn,
                  const xf86ProviderFuncsRec * funcs, const char *name);

extern _X_EXPORT void
xf86DetachAllCrtc(ScrnInfoPtr scrn);

#endif                          /* _XF86CRTC_H_ */