xref: /xsrc/external/mit/xorg-server/dist/include/scrnintstr.h

/***********************************************************

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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Except as contained in this notice, the name of The Open Group shall not be
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in this Software without prior written authorization from The Open Group.

Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
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 Digital not be
used in advertising or publicity pertaining to distribution of the
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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******************************************************************/

#ifndef SCREENINTSTRUCT_H
#define SCREENINTSTRUCT_H

#include "screenint.h"
#include "regionstr.h"
#include "colormap.h"
#include "cursor.h"
#include "validate.h"
#include <X11/Xproto.h>
#include "dix.h"
#include "privates.h"
#include <X11/extensions/randr.h>

typedef struct _PixmapFormat {
    unsigned char depth;
    unsigned char bitsPerPixel;
    unsigned char scanlinePad;
} PixmapFormatRec;

typedef struct _Visual {
    VisualID vid;
    short class;
    short bitsPerRGBValue;
    short ColormapEntries;
    short nplanes;              /* = log2 (ColormapEntries). This does not
                                 * imply that the screen has this many planes.
                                 * it may have more or fewer */
    unsigned long redMask, greenMask, blueMask;
    int offsetRed, offsetGreen, offsetBlue;
} VisualRec;

typedef struct _Depth {
    unsigned char depth;
    short numVids;
    VisualID *vids;             /* block of visual ids for this depth */
} DepthRec;

typedef struct _ScreenSaverStuff {
    WindowPtr pWindow;
    XID wid;
    char blanked;
    Bool (*ExternalScreenSaver) (ScreenPtr /*pScreen */ ,
                                 int /*xstate */ ,
                                 Bool /*force */ );
} ScreenSaverStuffRec;

/*
 *  There is a typedef for each screen function pointer so that code that
 *  needs to declare a screen function pointer (e.g. in a screen private
 *  or as a local variable) can easily do so and retain full type checking.
 */

typedef Bool (*CloseScreenProcPtr) (ScreenPtr /*pScreen */ );

typedef void (*QueryBestSizeProcPtr) (int /*class */ ,
                                      unsigned short * /*pwidth */ ,
                                      unsigned short * /*pheight */ ,
                                      ScreenPtr /*pScreen */ );

typedef Bool (*SaveScreenProcPtr) (ScreenPtr /*pScreen */ ,
                                   int /*on */ );

typedef void (*GetImageProcPtr) (DrawablePtr /*pDrawable */ ,
                                 int /*sx */ ,
                                 int /*sy */ ,
                                 int /*w */ ,
                                 int /*h */ ,
                                 unsigned int /*format */ ,
                                 unsigned long /*planeMask */ ,
                                 char * /*pdstLine */ );

typedef void (*GetSpansProcPtr) (DrawablePtr /*pDrawable */ ,
                                 int /*wMax */ ,
                                 DDXPointPtr /*ppt */ ,
                                 int * /*pwidth */ ,
                                 int /*nspans */ ,
                                 char * /*pdstStart */ );

typedef void (*SourceValidateProcPtr) (DrawablePtr /*pDrawable */ ,
                                       int /*x */ ,
                                       int /*y */ ,
                                       int /*width */ ,
                                       int /*height */ ,
                                       unsigned int /*subWindowMode */ );

typedef Bool (*CreateWindowProcPtr) (WindowPtr /*pWindow */ );

typedef Bool (*DestroyWindowProcPtr) (WindowPtr /*pWindow */ );

typedef Bool (*PositionWindowProcPtr) (WindowPtr /*pWindow */ ,
                                       int /*x */ ,
                                       int /*y */ );

typedef Bool (*ChangeWindowAttributesProcPtr) (WindowPtr /*pWindow */ ,
                                               unsigned long /*mask */ );

typedef Bool (*RealizeWindowProcPtr) (WindowPtr /*pWindow */ );

typedef Bool (*UnrealizeWindowProcPtr) (WindowPtr /*pWindow */ );

typedef void (*RestackWindowProcPtr) (WindowPtr /*pWindow */ ,
                                      WindowPtr /*pOldNextSib */ );

typedef int (*ValidateTreeProcPtr) (WindowPtr /*pParent */ ,
                                    WindowPtr /*pChild */ ,
                                    VTKind /*kind */ );

typedef void (*PostValidateTreeProcPtr) (WindowPtr /*pParent */ ,
                                         WindowPtr /*pChild */ ,
                                         VTKind /*kind */ );

typedef void (*WindowExposuresProcPtr) (WindowPtr /*pWindow */ ,
                                        RegionPtr /*prgn */);

typedef void (*PaintWindowProcPtr) (WindowPtr /*pWindow*/,
                                    RegionPtr /*pRegion*/,
                                    int /*what*/);

typedef void (*CopyWindowProcPtr) (WindowPtr /*pWindow */ ,
                                   DDXPointRec /*ptOldOrg */ ,
                                   RegionPtr /*prgnSrc */ );

typedef void (*ClearToBackgroundProcPtr) (WindowPtr /*pWindow */ ,
                                          int /*x */ ,
                                          int /*y */ ,
                                          int /*w */ ,
                                          int /*h */ ,
                                          Bool /*generateExposures */ );

typedef void (*ClipNotifyProcPtr) (WindowPtr /*pWindow */ ,
                                   int /*dx */ ,
                                   int /*dy */ );

/* pixmap will exist only for the duration of the current rendering operation */
#define CREATE_PIXMAP_USAGE_SCRATCH                     1
/* pixmap will be the backing pixmap for a redirected window */
#define CREATE_PIXMAP_USAGE_BACKING_PIXMAP              2
/* pixmap will contain a glyph */
#define CREATE_PIXMAP_USAGE_GLYPH_PICTURE               3
/* pixmap will be shared */
#define CREATE_PIXMAP_USAGE_SHARED                      4

typedef PixmapPtr (*CreatePixmapProcPtr) (ScreenPtr /*pScreen */ ,
                                          int /*width */ ,
                                          int /*height */ ,
                                          int /*depth */ ,
                                          unsigned /*usage_hint */ );

typedef Bool (*DestroyPixmapProcPtr) (PixmapPtr /*pPixmap */ );

typedef Bool (*RealizeFontProcPtr) (ScreenPtr /*pScreen */ ,
                                    FontPtr /*pFont */ );

typedef Bool (*UnrealizeFontProcPtr) (ScreenPtr /*pScreen */ ,
                                      FontPtr /*pFont */ );

typedef void (*ConstrainCursorProcPtr) (DeviceIntPtr /*pDev */ ,
                                        ScreenPtr /*pScreen */ ,
                                        BoxPtr /*pBox */ );

typedef void (*CursorLimitsProcPtr) (DeviceIntPtr /* pDev */ ,
                                     ScreenPtr /*pScreen */ ,
                                     CursorPtr /*pCursor */ ,
                                     BoxPtr /*pHotBox */ ,
                                     BoxPtr /*pTopLeftBox */ );

typedef Bool (*DisplayCursorProcPtr) (DeviceIntPtr /* pDev */ ,
                                      ScreenPtr /*pScreen */ ,
                                      CursorPtr /*pCursor */ );

typedef Bool (*RealizeCursorProcPtr) (DeviceIntPtr /* pDev */ ,
                                      ScreenPtr /*pScreen */ ,
                                      CursorPtr /*pCursor */ );

typedef Bool (*UnrealizeCursorProcPtr) (DeviceIntPtr /* pDev */ ,
                                        ScreenPtr /*pScreen */ ,
                                        CursorPtr /*pCursor */ );

typedef void (*RecolorCursorProcPtr) (DeviceIntPtr /* pDev */ ,
                                      ScreenPtr /*pScreen */ ,
                                      CursorPtr /*pCursor */ ,
                                      Bool /*displayed */ );

typedef Bool (*SetCursorPositionProcPtr) (DeviceIntPtr /* pDev */ ,
                                          ScreenPtr /*pScreen */ ,
                                          int /*x */ ,
                                          int /*y */ ,
                                          Bool /*generateEvent */ );

typedef Bool (*CreateGCProcPtr) (GCPtr /*pGC */ );

typedef Bool (*CreateColormapProcPtr) (ColormapPtr /*pColormap */ );

typedef void (*DestroyColormapProcPtr) (ColormapPtr /*pColormap */ );

typedef void (*InstallColormapProcPtr) (ColormapPtr /*pColormap */ );

typedef void (*UninstallColormapProcPtr) (ColormapPtr /*pColormap */ );

typedef int (*ListInstalledColormapsProcPtr) (ScreenPtr /*pScreen */ ,
                                              XID * /*pmaps */ );

typedef void (*StoreColorsProcPtr) (ColormapPtr /*pColormap */ ,
                                    int /*ndef */ ,
                                    xColorItem * /*pdef */ );

typedef void (*ResolveColorProcPtr) (unsigned short * /*pred */ ,
                                     unsigned short * /*pgreen */ ,
                                     unsigned short * /*pblue */ ,
                                     VisualPtr /*pVisual */ );

typedef RegionPtr (*BitmapToRegionProcPtr) (PixmapPtr /*pPix */ );

typedef void (*ScreenBlockHandlerProcPtr) (ScreenPtr pScreen,
                                           void *pTimeout,
                                           void *pReadmask);

typedef void (*ScreenWakeupHandlerProcPtr) (ScreenPtr pScreen,
                                            unsigned long result,
                                            void *pReadMask);

typedef Bool (*CreateScreenResourcesProcPtr) (ScreenPtr /*pScreen */ );

typedef Bool (*ModifyPixmapHeaderProcPtr) (PixmapPtr pPixmap,
                                           int width,
                                           int height,
                                           int depth,
                                           int bitsPerPixel,
                                           int devKind,
                                           void *pPixData);

typedef PixmapPtr (*GetWindowPixmapProcPtr) (WindowPtr /*pWin */ );

typedef void (*SetWindowPixmapProcPtr) (WindowPtr /*pWin */ ,
                                        PixmapPtr /*pPix */ );

typedef PixmapPtr (*GetScreenPixmapProcPtr) (ScreenPtr /*pScreen */ );

typedef void (*SetScreenPixmapProcPtr) (PixmapPtr /*pPix */ );

typedef void (*MarkWindowProcPtr) (WindowPtr /*pWin */ );

typedef Bool (*MarkOverlappedWindowsProcPtr) (WindowPtr /*parent */ ,
                                              WindowPtr /*firstChild */ ,
                                              WindowPtr * /*pLayerWin */ );

typedef int (*ConfigNotifyProcPtr) (WindowPtr /*pWin */ ,
                                    int /*x */ ,
                                    int /*y */ ,
                                    int /*w */ ,
                                    int /*h */ ,
                                    int /*bw */ ,
                                    WindowPtr /*pSib */ );

typedef void (*MoveWindowProcPtr) (WindowPtr /*pWin */ ,
                                   int /*x */ ,
                                   int /*y */ ,
                                   WindowPtr /*pSib */ ,
                                   VTKind /*kind */ );

typedef void (*ResizeWindowProcPtr) (WindowPtr /*pWin */ ,
                                     int /*x */ ,
                                     int /*y */ ,
                                     unsigned int /*w */ ,
                                     unsigned int /*h */ ,
                                     WindowPtr  /*pSib */
    );

typedef WindowPtr (*GetLayerWindowProcPtr) (WindowPtr   /*pWin */
    );

typedef void (*HandleExposuresProcPtr) (WindowPtr /*pWin */ );

typedef void (*ReparentWindowProcPtr) (WindowPtr /*pWin */ ,
                                       WindowPtr /*pPriorParent */ );

typedef void (*SetShapeProcPtr) (WindowPtr /*pWin */ ,
                                 int /* kind */ );

typedef void (*ChangeBorderWidthProcPtr) (WindowPtr /*pWin */ ,
                                          unsigned int /*width */ );

typedef void (*MarkUnrealizedWindowProcPtr) (WindowPtr /*pChild */ ,
                                             WindowPtr /*pWin */ ,
                                             Bool /*fromConfigure */ );

typedef Bool (*DeviceCursorInitializeProcPtr) (DeviceIntPtr /* pDev */ ,
                                               ScreenPtr /* pScreen */ );

typedef void (*DeviceCursorCleanupProcPtr) (DeviceIntPtr /* pDev */ ,
                                            ScreenPtr /* pScreen */ );

typedef void (*ConstrainCursorHarderProcPtr) (DeviceIntPtr, ScreenPtr, int,
                                              int *, int *);


typedef Bool (*SharePixmapBackingProcPtr)(PixmapPtr, ScreenPtr, void **);

typedef Bool (*SetSharedPixmapBackingProcPtr)(PixmapPtr, void *);

typedef Bool (*StartPixmapTrackingProcPtr)(PixmapPtr, PixmapPtr,
                                           int x, int y,
                                           int dst_x, int dst_y,
                                           Rotation rotation);

typedef Bool (*StopPixmapTrackingProcPtr)(PixmapPtr, PixmapPtr);

typedef Bool (*ReplaceScanoutPixmapProcPtr)(DrawablePtr, PixmapPtr, Bool);

typedef WindowPtr (*XYToWindowProcPtr)(ScreenPtr pScreen,
                                       SpritePtr pSprite, int x, int y);

typedef int (*NameWindowPixmapProcPtr)(WindowPtr, PixmapPtr, CARD32);

/* Wrapping Screen procedures

   There are a few modules in the X server which dynamically add and
    remove themselves from various screen procedure call chains.

    For example, the BlockHandler is dynamically modified by:

     * xf86Rotate
     * miSprite
     * composite
     * render (for animated cursors)

    Correctly manipulating this chain is complicated by the fact that
    the chain is constructed through a sequence of screen private
    structures, each holding the next screen->proc pointer.

    To add a module to a screen->proc chain is fairly simple; just save
    the current screen->proc value in the module screen private
    and store the module's function in the screen->proc location.

    Removing a screen proc is a bit trickier. It seems like all you
    need to do is set the screen->proc pointer back to the value saved
    in your screen private. However, if some other module has come
    along and wrapped on top of you, then the right place to store the
    previous screen->proc value is actually in the wrapping module's
    screen private structure(!). Of course, you have no idea what
    other module may have wrapped on top, nor could you poke inside
    its screen private in any case.

    To make this work, we restrict the unwrapping process to happen
    during the invocation of the screen proc itself, and then we
    require the screen proc to take some care when manipulating the
    screen proc functions pointers.

    The requirements are:

     1) The screen proc must set the screen->proc pointer back to the
        value saved in its screen private before calling outside its
        module.

     2a) If the screen proc wants to be remove itself from the chain,
         it must not manipulate screen->proc pointer again before
         returning.

     2b) If the screen proc wants to remain in the chain, it must:

       2b.1) Re-fetch the screen->proc pointer and store that in
             its screen private. This ensures that any changes
             to the chain will be preserved.

       2b.2) Set screen->proc back to itself

    One key requirement here is that these steps must wrap not just
    any invocation of the nested screen->proc value, but must nest
    essentially any calls outside the current module. This ensures
    that other modules can reliably manipulate screen->proc wrapping
    using these same rules.

    For example, the animated cursor code in render has two macros,
    Wrap and Unwrap.

        #define Unwrap(as,s,elt)    ((s)->elt = (as)->elt)

    Unwrap takes the screen private (as), the screen (s) and the
    member name (elt), and restores screen->proc to that saved in the
    screen private.

        #define Wrap(as,s,elt,func) (((as)->elt = (s)->elt), (s)->elt = func)

    Wrap takes the screen private (as), the screen (s), the member
    name (elt) and the wrapping function (func). It saves the
    current screen->proc value in the screen private, and then sets the
    screen->proc to the local wrapping function.

    Within each of these functions, there's a pretty simple pattern:

        Unwrap(as, pScreen, UnrealizeCursor);

        // Do local stuff, including possibly calling down through
        // pScreen->UnrealizeCursor

        Wrap(as, pScreen, UnrealizeCursor, AnimCurUnrealizeCursor);

    The wrapping block handler is a bit different; it does the Unwrap,
    the local operations and then only re-Wraps if the hook is still
    required. Unwrap occurrs at the top of each function, just after
    entry, and Wrap occurrs at the bottom of each function, just
    before returning.
 */

typedef struct _Screen {
    int myNum;                  /* index of this instance in Screens[] */
    ATOM id;
    short x, y, width, height;
    short mmWidth, mmHeight;
    short numDepths;
    unsigned char rootDepth;
    DepthPtr allowedDepths;
    unsigned long rootVisual;
    unsigned long defColormap;
    short minInstalledCmaps, maxInstalledCmaps;
    char backingStoreSupport, saveUnderSupport;
    unsigned long whitePixel, blackPixel;
    GCPtr GCperDepth[MAXFORMATS + 1];
    /* next field is a stipple to use as default in
       a GC.  we don't build default tiles of all depths
       because they are likely to be of a color
       different from the default fg pixel, so
       we don't win anything by building
       a standard one.
     */
    PixmapPtr PixmapPerDepth[1];
    void *devPrivate;
    short numVisuals;
    VisualPtr visuals;
    WindowPtr root;
    ScreenSaverStuffRec screensaver;

    DevPrivateSetRec    screenSpecificPrivates[PRIVATE_LAST];

    /* Random screen procedures */

    CloseScreenProcPtr CloseScreen;
    QueryBestSizeProcPtr QueryBestSize;
    SaveScreenProcPtr SaveScreen;
    GetImageProcPtr GetImage;
    GetSpansProcPtr GetSpans;
    SourceValidateProcPtr SourceValidate;

    /* Window Procedures */

    CreateWindowProcPtr CreateWindow;
    DestroyWindowProcPtr DestroyWindow;
    PositionWindowProcPtr PositionWindow;
    ChangeWindowAttributesProcPtr ChangeWindowAttributes;
    RealizeWindowProcPtr RealizeWindow;
    UnrealizeWindowProcPtr UnrealizeWindow;
    ValidateTreeProcPtr ValidateTree;
    PostValidateTreeProcPtr PostValidateTree;
    WindowExposuresProcPtr WindowExposures;
    CopyWindowProcPtr CopyWindow;
    ClearToBackgroundProcPtr ClearToBackground;
    ClipNotifyProcPtr ClipNotify;
    RestackWindowProcPtr RestackWindow;
    PaintWindowProcPtr PaintWindow;

    /* Pixmap procedures */

    CreatePixmapProcPtr CreatePixmap;
    DestroyPixmapProcPtr DestroyPixmap;

    /* Font procedures */

    RealizeFontProcPtr RealizeFont;
    UnrealizeFontProcPtr UnrealizeFont;

    /* Cursor Procedures */

    ConstrainCursorProcPtr ConstrainCursor;
    ConstrainCursorHarderProcPtr ConstrainCursorHarder;
    CursorLimitsProcPtr CursorLimits;
    DisplayCursorProcPtr DisplayCursor;
    RealizeCursorProcPtr RealizeCursor;
    UnrealizeCursorProcPtr UnrealizeCursor;
    RecolorCursorProcPtr RecolorCursor;
    SetCursorPositionProcPtr SetCursorPosition;

    /* GC procedures */

    CreateGCProcPtr CreateGC;

    /* Colormap procedures */

    CreateColormapProcPtr CreateColormap;
    DestroyColormapProcPtr DestroyColormap;
    InstallColormapProcPtr InstallColormap;
    UninstallColormapProcPtr UninstallColormap;
    ListInstalledColormapsProcPtr ListInstalledColormaps;
    StoreColorsProcPtr StoreColors;
    ResolveColorProcPtr ResolveColor;

    /* Region procedures */

    BitmapToRegionProcPtr BitmapToRegion;

    /* os layer procedures */

    ScreenBlockHandlerProcPtr BlockHandler;
    ScreenWakeupHandlerProcPtr WakeupHandler;

    /* anybody can get a piece of this array */
    PrivateRec *devPrivates;

    CreateScreenResourcesProcPtr CreateScreenResources;
    ModifyPixmapHeaderProcPtr ModifyPixmapHeader;

    GetWindowPixmapProcPtr GetWindowPixmap;
    SetWindowPixmapProcPtr SetWindowPixmap;
    GetScreenPixmapProcPtr GetScreenPixmap;
    SetScreenPixmapProcPtr SetScreenPixmap;
    NameWindowPixmapProcPtr NameWindowPixmap;

    PixmapPtr pScratchPixmap;   /* scratch pixmap "pool" */

    unsigned int totalPixmapSize;

    MarkWindowProcPtr MarkWindow;
    MarkOverlappedWindowsProcPtr MarkOverlappedWindows;
    ConfigNotifyProcPtr ConfigNotify;
    MoveWindowProcPtr MoveWindow;
    ResizeWindowProcPtr ResizeWindow;
    GetLayerWindowProcPtr GetLayerWindow;
    HandleExposuresProcPtr HandleExposures;
    ReparentWindowProcPtr ReparentWindow;

    SetShapeProcPtr SetShape;

    ChangeBorderWidthProcPtr ChangeBorderWidth;
    MarkUnrealizedWindowProcPtr MarkUnrealizedWindow;

    /* Device cursor procedures */
    DeviceCursorInitializeProcPtr DeviceCursorInitialize;
    DeviceCursorCleanupProcPtr DeviceCursorCleanup;

    /* set it in driver side if X server can copy the framebuffer content.
     * Meant to be used together with '-background none' option, avoiding
     * malicious users to steal framebuffer's content if that would be the
     * default */
    Bool canDoBGNoneRoot;

    Bool isGPU;

    struct xorg_list unattached_list;
    struct xorg_list unattached_head;

    ScreenPtr current_master;

    struct xorg_list output_slave_list;
    struct xorg_list output_head;

    SharePixmapBackingProcPtr SharePixmapBacking;
    SetSharedPixmapBackingProcPtr SetSharedPixmapBacking;

    StartPixmapTrackingProcPtr StartPixmapTracking;
    StopPixmapTrackingProcPtr StopPixmapTracking;

    struct xorg_list pixmap_dirty_list;
    struct xorg_list offload_slave_list;
    struct xorg_list offload_head;

    ReplaceScanoutPixmapProcPtr ReplaceScanoutPixmap;
    XYToWindowProcPtr XYToWindow;
} ScreenRec;

static inline RegionPtr
BitmapToRegion(ScreenPtr _pScreen, PixmapPtr pPix)
{
    return (*(_pScreen)->BitmapToRegion) (pPix);        /* no mi version?! */
}

typedef struct _ScreenInfo {
    int imageByteOrder;
    int bitmapScanlineUnit;
    int bitmapScanlinePad;
    int bitmapBitOrder;
    int numPixmapFormats;
     PixmapFormatRec formats[MAXFORMATS];
    int numScreens;
    ScreenPtr screens[MAXSCREENS];
    int numGPUScreens;
    ScreenPtr gpuscreens[MAXGPUSCREENS];
    int x;                      /* origin */
    int y;                      /* origin */
    int width;                  /* total width of all screens together */
    int height;                 /* total height of all screens together */
} ScreenInfo;

extern _X_EXPORT ScreenInfo screenInfo;

extern _X_EXPORT void InitOutput(ScreenInfo * /*pScreenInfo */ ,
                                 int /*argc */ ,
                                 char ** /*argv */ );

#endif                          /* SCREENINTSTRUCT_H */