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vt1200/xie/docs/dec/xie23-src/include/xestream.h
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arti d8d54bb990 feat(xie): a client-chosen XIE image is displayed on the VT1200 
The XIE path now runs end to end: XieCreateImage -> XieCreatePhoto ->
XiePutTile -> XieExport(photomap -> depth-1 pixmap) -> XCopyArea(pixmap ->
window), and the client's tile appears on screen at the client's own window
position, pixel-exact.

TWO FAULTS BEHIND THE LONG DEAD END

1. Device model (harness/mame/vt1200.cpp, opt-in VT1200_ACCEL=1).  The
   accelerator's output port 0x5600200 returns the pixel stream the firmware
   pushed into the FIFO -- the firmware then stores it into the drawable itself
   (file 0x125528: MOVE *B6,*B1 ; ADDK 0x10,B1).  The FIFO read pointer was
   never reset between transfers, so consecutive exports read stale words and
   the same fill produced 759 then 516 set pixels.  Reset m_fifo_in/out on the
   data-register write; the export is now deterministic.

2. Measurement, not the device.
   - dwt/screenshot.py without --real reads 1024x1024 at a 128-byte row stride,
     but the VR319 default programs 1280x1024 at a 2048-bit (256-byte) pitch.
     That is the "shifted" picture; --real is the correct read.
   - The earlier "0 differing bytes over 128 KiB" VRAM comparison stepped peek
     by 1024 *bit* addresses, so it scanned rows 0..63 only -- never the window
     at rows 200..263.  Over the real raster the white/black diff is 576 bytes
     spanning exactly those rows.
   - New instrument: decclient does a server-side XGetImage readback of the
     pixmap and window and counts set pixels.  That separated "the server never
     drew it" from "the framebuffer view is wrong".

EVIDENCE (reproduced twice, the second time from a fresh machine)

  no export vs 0xFF : 4096 / 4096 pixels differ
  no export vs 0x00 :    0 / 4096   (the window background is black)
  0xFF      vs 0x00 : 4096 / 4096
  0xAA      vs 0x0F : 2048 / 4096   (the two stripe phases)

Tile byte 0xAA reproduces as 1-pixel vertical stripes, 0x0F as 4-pixel, with
no shear -- so the placement is right and the pixels are the client's.

Contents: xie/ holds DEC XIE 2.3 headers, 84 man pages and complete
client+server source; a libXie.a and decclient built from DEC's own code; the
XIE probes; and evidence/ with every measurement, including explicit
retractions of the earlier wrong readings (VRAM_IDENTICAL_FOR_BOTH_FILLS and
friends).  xie/evidence/XIE_IMAGE_DISPLAYED.md is the report; frames are in
xie/evidence/png/.

The accelerator model stays opt-in: it answers the status poll and relays the
pixel stream, but performs no compositing, so it is a stand-in and the verified
default configuration is unchanged (a no-env run still parks in the level-0
diagnostics menu at PC=3FDCE400).
2026-11-01 23:22:25 +02:00

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/*
* *****************************************************************
* * *
* * Copyright (c) Digital Equipment Corporation, 1991, 1994 *
* * *
* * All Rights Reserved. Unpublished rights reserved under *
* * the copyright laws of the United States. *
* * *
* * The software contained on this media is proprietary to *
* * and embodies the confidential technology of Digital *
* * Equipment Corporation. Possession, use, duplication or *
* * dissemination of the software and media is authorized only *
* * pursuant to a valid written license from Digital Equipment *
* * Corporation. *
* * *
* * RESTRICTED RIGHTS LEGEND Use, duplication, or disclosure *
* * by the U.S. Government is subject to restrictions as set *
* * forth in Subparagraph (c)(1)(ii) of DFARS 252.227-7013, *
* * or in FAR 52.227-19, as applicable. *
* * *
* *****************************************************************
*/
/*
* HISTORY
*/
/*
**************************************************************************
** DIGITAL EQUIPMENT CORPORATION **
** CONFIDENTIAL **
** NOT FOR MODIFICATION OR REDISTRIBUTION IN ANY MANNER WHATSOEVER **
**************************************************************************
*/
/* BuildSystemHeader added automatically */
/* $Header: /alphabits/u3/x11/ode/rcs/x11/src/extensions/include/xestream.h,v 1.1.2.2 92/02/06 16:53:05 Jim_Ludwig Exp $ */
#ifndef __XESTREAM__
#define __XESTREAM__ "@(#)xestream.h 1.11 - 90/11/07 "
/*****************************************************************************
Copyright 1987, 1988, 1989, 1990, 1991 by Digital Equipment Corp., Maynard, MA
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
software without specific, written prior permission.
DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL 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.
*****************************************************************************/
/*
*
* CONTRIBUTORS:
*
* Dick Annicchiarico
* Robert Chesler
* Dan Coutu
* Gene Durso
* Marc Evans
* Alan Jamison
* Mark Henry
* Ken Miller
*
* DESCRIPTION:
* This header file describes the data structures and constants
* required to utilize the custom "stream" facility which presents
* a common interface to varying I/O transports. Currently only
* partially implemented for (server-side).
*/
#include <stdio.h>
#if defined TCPCONN && !defined VMS
#include <netinet/in.h>
#endif
#if defined DNETCONN && !defined VMS
#include <netdnet/dn.h>
#endif
typedef struct
{
INT32 flink;
INT32 blink;
}
#ifdef VMS
_align(QUADWORD)
#endif
QUEUE_HDR;
/* Stream I/O data abstraction:
* The following structures support a loose rendition of
* stream I/O abstraction for use in writing more portable
* applications between VMS and U*IX. It was intentionally
* decided NOT to attempt to implement streams per the
* published interface specification (beyond *our* scope).
* However, the *principle* is being observed in the hope
* that someday XTrap can take advantage of some future
* streams implementation.
*/
typedef struct _XESTREAM /* stream I/O object */
{
struct _XESTREAM *next;
CARD8 type;
Bool queue;
int_function accept;
int_function close;
int_function read;
int_function write;
void_function err_func;
CARD16 addr1_lgth; /* in bytes (counted string) */
char *addr1; /* string of what's opened */
CARD16 addr2_lgth; /* in bytes (counted string) */
char *addr2; /* Maybe a return addr (DECnet) */
union
{
struct _qio
{
INT16 read_chan;
INT16 write_chan;
CARD16 iosb[4L];
CARD32 efn;
CARD32 read_mode;
CARD32 write_mode;
QUEUE_HDR *read_queue; /* must be quadword-aligned loc */
QUEUE_HDR *free_queue; /* must be quadword-aligned loc */
CARD32 byte_cnt;
CARD32 bufsiz;
CARD32 bufinc;
CARD32 errno;
#if defined TCPCONN || defined DNETCONN
CARD32 accept_efn;
INT16 port;
INT16 mbx_chan;
void *ncb; /* VMS-only Network Command Block Info */
void *netcmd; /* VMS-only Network Command Mbx Logical */
#endif
} Q;
struct _dsc
{
INT32 fd;
INT32 sd; /* socket descriptor for init connection */
#if defined TCPCONN && !defined VMS
struct sockaddr_in insock;
#endif
#if defined DNETCONN && !defined VMS
struct sockaddr_dn dnsock;
#endif
} D;
} u;
} XESTREAM;
/* Currently defined Stream Types */
#define StreamInternet 1L
#define StreamDECnet 2L
#define StreamMbx 3L /* Only on VMS */
#define StreamShMem 4L /* Not Currently Implemented */
#define StreamFile 5L
#define StreamLAT 6L /* Not Currently Implemented */
#define BUFSIZstream 1500L /* Stream BUFSIZ used w/queued stream type */
/* Note: Can't be <110 bytes for DECnet */
#define BUFstream 1L /* Initial increment of n buffers per */
/* stream. Increases exponentially as more */
/* are req'd */
#ifdef vms
typedef struct _QREC
{
CARD32 queue_entry[2L];
CARD16 iosb[4L];
XESTREAM *st;
CARD8 *data;
}
#ifdef VMS
_align(QUADWORD)
#endif
QREC;
typedef struct _QREC *QRECPtr;
#define MbxSize 8192L
#define MbxBufs 2L
#endif
#if defined TCPCONN || defined DNETCONN
#define AcceptInterval 2 /* in seconds */
#define AcceptLoops 15 /* max times around the loop */
#endif
#define XEStreamEFN 7L /* Arbitrary event flag in cluster 0 for VMS use */
#define SIOErr(st,err_str) ((void)(*(st)->err_func)(err_str))
#define SIOSetErrFunc(st,rtn) ((st)->err_func = (void_function)rtn)
#define SIOGetErrFunc(st) ((st)->err_func)
#endif /* __XESTREAM__ */
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