/*
 * $XConsortium: XShm.c,v 1.16 94/04/17 20:22:55 rws Exp $
 *
Copyright (c) 1989  X Consortium

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 THE
X CONSORTIUM 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 X Consortium 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 X Consortium.
 *
 * Author:  Bob Scheifler and Keith Packard, MIT X Consortium
 */

/* THIS IS NOT AN X CONSORTIUM STANDARD */

#define NEED_EVENTS
#define NEED_REPLIES
#include "Xlibint.h"
#include "XShm.h"
#include "shmstr.h"
#include "Xext.h"
#include "extutil.h"

static XExtensionInfo _shm_info_data;
static XExtensionInfo *shm_info = &_shm_info_data;
static /* const */ char *shm_extension_name = SHMNAME;

#define ShmCheckExtension(dpy,i,val) \
  XextCheckExtension (dpy, i, shm_extension_name, val)

/*****************************************************************************
 *                                                                           *
 *			   private utility routines                          *
 *                                                                           *
 *****************************************************************************/

static int close_display();
static char *error_string();
static Bool wire_to_event();
static Status event_to_wire();
static /* const */ XExtensionHooks shm_extension_hooks = {
    NULL,				/* create_gc */
    NULL,				/* copy_gc */
    NULL,				/* flush_gc */
    NULL,				/* free_gc */
    NULL,				/* create_font */
    NULL,				/* free_font */
    close_display,			/* close_display */
    wire_to_event,			/* wire_to_event */
    event_to_wire,			/* event_to_wire */
    NULL,				/* error */
    error_string,			/* error_string */
};

static /* const */ char *shm_error_list[] = {
    "BadShmSeg",			/* BadShmSeg */
};

static XEXT_GENERATE_FIND_DISPLAY (find_display, shm_info, shm_extension_name, 
				   &shm_extension_hooks, ShmNumberEvents, NULL)

static XEXT_GENERATE_CLOSE_DISPLAY (close_display, shm_info)

static XEXT_GENERATE_ERROR_STRING (error_string, shm_extension_name,
				   ShmNumberErrors, shm_error_list)


static Bool wire_to_event (dpy, re, event)
    Display *dpy;
    XEvent  *re;
    xEvent  *event;
{
    XExtDisplayInfo *info = find_display (dpy);
    XShmCompletionEvent	*se;
    xShmCompletionEvent	*sevent;

    ShmCheckExtension (dpy, info, False);

    switch ((event->u.u.type & 0x7f) - info->codes->first_event) {
    case ShmCompletion:
	se = (XShmCompletionEvent *) re;
	sevent = (xShmCompletionEvent *) event;
	se->type = sevent->type & 0x7f;
	se->serial = _XSetLastRequestRead(dpy,(xGenericReply *) event);
	se->send_event = (sevent->type & 0x80) != 0;
	se->display = dpy;
	se->drawable = sevent->drawable;
	se->major_code = sevent->majorEvent;
	se->minor_code = sevent->minorEvent;
	se->shmseg = sevent->shmseg;
	se->offset = sevent->offset;
    	return True;
    }
    return False;
}

static Status event_to_wire (dpy, re, event)
    Display *dpy;
    XEvent  *re;
    xEvent  *event;
{
    XExtDisplayInfo *info = find_display (dpy);
    XShmCompletionEvent	*se;
    xShmCompletionEvent	*sevent;

    ShmCheckExtension (dpy, info, 0);

    switch ((re->type & 0x7f) - info->codes->first_event) {
    case ShmCompletion:
    	se = (XShmCompletionEvent *) re;
	sevent = (xShmCompletionEvent *) event;
    	sevent->type = se->type | (se->send_event ? 0x80 : 0);
    	sevent->sequenceNumber = se->serial & 0xffff;
    	sevent->drawable = se->drawable;
    	sevent->majorEvent = se->major_code;
    	sevent->minorEvent = se->minor_code;
    	sevent->shmseg = se->shmseg;
    	sevent->offset = se->offset;
    	return True;
    }
    return False;
}

/*****************************************************************************
 *                                                                           *
 *		    public Shared Memory Extension routines                  *
 *                                                                           *
 *****************************************************************************/

Bool XShmQueryExtension (dpy /* event_basep, error_basep */)
    Display *dpy;
/*  int *event_basep, *error_basep; */
{
    XExtDisplayInfo *info = find_display (dpy);

    if (XextHasExtension(info)) {
/*	*event_basep = info->codes->first_event;
	*error_basep = info->codes->error_event; */
	return True;
    } else {
	return False;
    }
}


int XShmGetEventBase(dpy)
    Display *dpy;
{
    XExtDisplayInfo *info = find_display (dpy);

    if (XextHasExtension(info)) {
	return info->codes->first_event;
    } else {
	return -1;
    }
}


Bool XShmQueryVersion(dpy, majorVersion, minorVersion, sharedPixmaps)
    Display *dpy;
    int	    *majorVersion, *minorVersion;
    Bool    *sharedPixmaps;
{
    XExtDisplayInfo *info = find_display (dpy);
    xShmQueryVersionReply rep;
    register xShmQueryVersionReq *req;

    ShmCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(ShmQueryVersion, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmQueryVersion;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    *majorVersion = rep.majorVersion;
    *minorVersion = rep.minorVersion;
    *sharedPixmaps = rep.sharedPixmaps ? True : False;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}


int XShmPixmapFormat(dpy)
    Display *dpy;
{
    XExtDisplayInfo *info = find_display (dpy);
    xShmQueryVersionReply rep;
    register xShmQueryVersionReq *req;

    ShmCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(ShmQueryVersion, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmQueryVersion;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return 0;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    if (rep.sharedPixmaps &&
	(rep.majorVersion > 1 || rep.minorVersion > 0))
	return rep.pixmapFormat;
    return 0;
}


Status XShmAttach(dpy, shminfo)
    Display *dpy;
    XShmSegmentInfo *shminfo;
{
    XExtDisplayInfo *info = find_display (dpy);
    register xShmAttachReq *req;

    ShmCheckExtension (dpy, info, 0);

    shminfo->shmseg = XAllocID(dpy);
    LockDisplay(dpy);
    GetReq(ShmAttach, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmAttach;
    req->shmseg = shminfo->shmseg;
    req->shmid = shminfo->shmid;
    req->readOnly = shminfo->readOnly ? xTrue : xFalse;
    UnlockDisplay(dpy);
    SyncHandle();
    return 1;
}


Status XShmDetach(dpy, shminfo)
    Display *dpy;
    XShmSegmentInfo *shminfo;
{
    XExtDisplayInfo *info = find_display (dpy);
    register xShmDetachReq *req;

    ShmCheckExtension (dpy, info, 0);

    LockDisplay(dpy);
    GetReq(ShmDetach, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmDetach;
    req->shmseg = shminfo->shmseg;
    UnlockDisplay(dpy);
    SyncHandle();
    return 1;
}

static int _XShmDestroyImage (ximage)
    XImage *ximage;

{
	Xfree((char *)ximage);
	return 1;
}

#define ROUNDUP(nbytes, pad) ((((nbytes) + ((pad) - 1)) / (pad)) * (pad))

XImage *XShmCreateImage (dpy, visual, depth, format, data, shminfo,
			 width, height)
    register Display *dpy;
    register Visual *visual;
    unsigned int depth;
    int format;
    char *data;
    XShmSegmentInfo *shminfo;
    unsigned int width;
    unsigned int height;
{
    register XImage *image;

    image = (XImage *)Xcalloc(1, (unsigned)sizeof(XImage));
    if (!image)
	return image;
    image->data = data;
    image->obdata = (char *)shminfo;
    image->width = width;
    image->height = height;
    image->depth = depth;
    image->format = format;
    image->byte_order = dpy->byte_order;
    image->bitmap_unit = dpy->bitmap_unit;
    image->bitmap_bit_order = dpy->bitmap_bit_order;
    image->bitmap_pad = _XGetScanlinePad(dpy, depth);
    image->xoffset = 0;
    if (visual) {
	image->red_mask = visual->red_mask;
	image->green_mask = visual->green_mask;
	image->blue_mask = visual->blue_mask;
    } else {
	image->red_mask = image->green_mask = image->blue_mask = 0;
    }
    if (format == ZPixmap)
	image->bits_per_pixel = _XGetBitsPerPixel(dpy, (int)depth);
    else
	image->bits_per_pixel = 1;
    image->bytes_per_line = ROUNDUP((image->bits_per_pixel * width),
				    image->bitmap_pad) >> 3;
    _XInitImageFuncPtrs(image);
    image->f.destroy_image = _XShmDestroyImage;
    return image;
}

Status XShmPutImage (dpy, d, gc, image, src_x, src_y, dst_x, dst_y,
		     src_width, src_height, send_event)
    register Display *dpy;
    Drawable d;
    GC gc;
    register XImage *image;
    int src_x, src_y, dst_x, dst_y;
    unsigned int src_width, src_height;
    Bool send_event;
{
    XExtDisplayInfo *info = find_display (dpy);
    XShmSegmentInfo *shminfo = (XShmSegmentInfo *)image->obdata;
    register xShmPutImageReq *req;

    ShmCheckExtension (dpy, info, 0);
    if (!shminfo) return 0;

    LockDisplay(dpy);
    FlushGC(dpy, gc);
    GetReq(ShmPutImage, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmPutImage;
    req->drawable = d;
    req->gc = gc->gid;
    req->srcX = src_x;
    req->srcY = src_y;
    req->srcWidth = src_width;
    req->srcHeight = src_height;
    req->dstX = dst_x;
    req->dstY = dst_y;
    req->totalWidth = image->width;
    req->totalHeight = image->height;
    req->depth = image->depth;
    req->format = image->format;
    req->sendEvent = send_event;
    req->shmseg = shminfo->shmseg;
    req->offset = image->data - shminfo->shmaddr;
    UnlockDisplay(dpy);
    SyncHandle();
    return 1;
}


Status XShmGetImage(dpy, d, image, x, y, plane_mask)
    register Display *dpy;
    Drawable d;
    XImage *image;
    int x, y;
    unsigned long plane_mask;
{
    XExtDisplayInfo *info = find_display (dpy);
    XShmSegmentInfo *shminfo = (XShmSegmentInfo *)image->obdata;
    register xShmGetImageReq *req;
    xShmGetImageReply rep;
    register Visual *visual;

    ShmCheckExtension (dpy, info, 0);
    if (!shminfo) return 0;

    LockDisplay(dpy);
    GetReq(ShmGetImage, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmGetImage;
    req->drawable = d;
    req->x = x;
    req->y = y;
    req->width = image->width;
    req->height = image->height;
    req->planeMask = plane_mask;
    req->format = image->format;
    req->shmseg = shminfo->shmseg;
    req->offset = image->data - shminfo->shmaddr;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return 0;
    }
    visual = _XVIDtoVisual(dpy, rep.visual);
    if (visual) {
    	image->red_mask = visual->red_mask;
    	image->green_mask = visual->green_mask;
    	image->blue_mask = visual->blue_mask;
    } else {
	image->red_mask = image->green_mask = image->blue_mask = 0;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return 1;
}

Pixmap XShmCreatePixmap (dpy, d, data, shminfo, width, height, depth)
    register Display *dpy;
    Drawable d;
    char *data;
    XShmSegmentInfo *shminfo;
    unsigned int width, height, depth;
{
    XExtDisplayInfo *info = find_display (dpy);
    Pixmap pid;
    register xShmCreatePixmapReq *req;

    ShmCheckExtension (dpy, info, 0);

    LockDisplay(dpy);
    GetReq(ShmCreatePixmap, req);
    req->reqType = info->codes->major_opcode;
    req->shmReqType = X_ShmCreatePixmap;
    req->drawable = d;
    req->width = width;
    req->height = height;
    req->depth = depth;
    req->shmseg = shminfo->shmseg;
    req->offset = data - shminfo->shmaddr;
    pid = req->pid = XAllocID(dpy);
    UnlockDisplay(dpy);
    SyncHandle();
    return pid;
}