File: dbestruct.h

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/******************************************************************************
 *
 * Copyright (c) 1994, 1995  Hewlett-Packard Company
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL HEWLETT-PACKARD COMPANY BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the Hewlett-Packard
 * Company shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization from the Hewlett-Packard Company.
 *
 *     Header file for DIX-related DBE
 *
 *****************************************************************************/

#ifndef DBE_STRUCT_H
#define DBE_STRUCT_H

/* INCLUDES */

#define NEED_DBE_PROTOCOL
#include <X11/extensions/dbeproto.h>
#include "windowstr.h"
#include "privates.h"

typedef struct {
    VisualID visual;            /* one visual ID that supports double-buffering */
    int depth;                  /* depth of visual in bits                      */
    int perflevel;              /* performance level of visual                  */
} XdbeVisualInfo;

typedef struct {
    int count;                  /* number of items in visual_depth   */
    XdbeVisualInfo *visinfo;    /* list of visuals & depths for scrn */
} XdbeScreenVisualInfo;

/* DEFINES */

#define DBE_SCREEN_PRIV(pScreen) ((DbeScreenPrivPtr) \
    dixLookupPrivate(&(pScreen)->devPrivates, dbeScreenPrivKey))

#define DBE_SCREEN_PRIV_FROM_DRAWABLE(pDrawable) \
    DBE_SCREEN_PRIV((pDrawable)->pScreen)

#define DBE_SCREEN_PRIV_FROM_WINDOW_PRIV(pDbeWindowPriv) \
    DBE_SCREEN_PRIV((pDbeWindowPriv)->pWindow->drawable.pScreen)

#define DBE_SCREEN_PRIV_FROM_WINDOW(pWindow) \
    DBE_SCREEN_PRIV((pWindow)->drawable.pScreen)

#define DBE_SCREEN_PRIV_FROM_PIXMAP(pPixmap) \
    DBE_SCREEN_PRIV((pPixmap)->drawable.pScreen)

#define DBE_SCREEN_PRIV_FROM_GC(pGC)\
    DBE_SCREEN_PRIV((pGC)->pScreen)

#define DBE_WINDOW_PRIV(pWin) ((DbeWindowPrivPtr) \
    dixLookupPrivate(&(pWin)->devPrivates, dbeWindowPrivKey))

/* Initial size of the buffer ID array in the window priv. */
#define DBE_INIT_MAX_IDS	2

/* Reallocation increment for the buffer ID array. */
#define DBE_INCR_MAX_IDS	4

/* Marker for free elements in the buffer ID array. */
#define DBE_FREE_ID_ELEMENT	0

/* TYPEDEFS */

/* Record used to pass swap information between DIX and DDX swapping
 * procedures.
 */
typedef struct _DbeSwapInfoRec {
    WindowPtr pWindow;
    unsigned char swapAction;

} DbeSwapInfoRec, *DbeSwapInfoPtr;

/*
 ******************************************************************************
 ** Per-window data
 ******************************************************************************
 */

typedef struct _DbeWindowPrivRec {
    /* A pointer to the window with which the DBE window private (buffer) is
     * associated.
     */
    WindowPtr pWindow;

    /* Last known swap action for this buffer.  Legal values for this field
     * are XdbeUndefined, XdbeBackground, XdbeUntouched, and XdbeCopied.
     */
    unsigned char swapAction;

    /* Last known buffer size.
     */
    unsigned short width, height;

    /* Coordinates used for static gravity when the window is positioned.
     */
    short x, y;

    /* Number of XIDs associated with this buffer.
     */
    int nBufferIDs;

    /* Capacity of the current buffer ID array, IDs. */
    int maxAvailableIDs;

    /* Pointer to the array of buffer IDs.  This initially points to initIDs.
     * When the static limit of the initIDs array is reached, the array is
     * reallocated and this pointer is set to the new array instead of initIDs.
     */
    XID *IDs;

    /* Initial array of buffer IDs.  We are defining the XID array within the
     * window priv to optimize for data locality.  In most cases, only one
     * buffer will be associated with a window.  Having the array declared
     * here can prevent us from accessing the data in another memory page,
     * possibly resulting in a page swap and loss of performance.  Initially we
     * will use this array to store buffer IDs.  For situations where we have
     * more IDs than can fit in this static array, we will allocate a larger
     * array to use, possibly suffering a performance loss.
     */
    XID initIDs[DBE_INIT_MAX_IDS];

    /* Pointer to a drawable that contains the contents of the back buffer.
     */
    PixmapPtr pBackBuffer;

    /* Pointer to a drawable that contains the contents of the front buffer.
     * This pointer is only used for the XdbeUntouched swap action.  For that
     * swap action, we need to copy the front buffer (window) contents into
     * this drawable, copy the contents of current back buffer drawable (the
     * back buffer) into the window, swap the front and back drawable pointers,
     * and then swap the drawable/resource associations in the resource
     * database.
     */
    PixmapPtr pFrontBuffer;

    /* Device-specific private information.
     */
    PrivateRec *devPrivates;

} DbeWindowPrivRec, *DbeWindowPrivPtr;

/*
 ******************************************************************************
 ** Per-screen data
 ******************************************************************************
 */

typedef struct _DbeScreenPrivRec {
    /* Wrapped functions
     * It is the responsibilty of the DDX layer to wrap PositionWindow().
     * DbeExtensionInit wraps DestroyWindow().
     */
    PositionWindowProcPtr PositionWindow;
    DestroyWindowProcPtr DestroyWindow;

    /* Per-screen DIX routines */
    Bool (*SetupBackgroundPainter) (WindowPtr /*pWin */ ,
                                    GCPtr       /*pGC */
        );

    /* Per-screen DDX routines */
    Bool (*GetVisualInfo) (ScreenPtr /*pScreen */ ,
                           XdbeScreenVisualInfo *       /*pVisInfo */
        );
    int (*AllocBackBufferName) (WindowPtr /*pWin */ ,
                                XID /*bufId */ ,
                                int     /*swapAction */
        );
    int (*SwapBuffers) (ClientPtr /*client */ ,
                        int * /*pNumWindows */ ,
                        DbeSwapInfoPtr  /*swapInfo */
        );
    void (*WinPrivDelete) (DbeWindowPrivPtr /*pDbeWindowPriv */ ,
                           XID  /*bufId */
        );
} DbeScreenPrivRec, *DbeScreenPrivPtr;

#endif                          /* DBE_STRUCT_H */