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view src/video/Xext/Xv/Xv.c @ 563:04dcaf3da918

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Massive Quartz input enhancements from Darrell Walisser. His email: Enclosed is a patch that addresses the following: --Various minor cleanups. Removed dead/obsolete code, made some style cleanups --Mouse Events Now keep track of what button(s) were pressed so we know when to send the mouse up event. This fixes the case where the mouse is dragged outside of the game window and released (in which case we want to send the mouse up event even though the mouse is outside the game window). --Input Grabbing Here is my take on the grabbing situation, which is the basis for the new implementation. There are 3 grab states, ungrabbed (UG), visible (VG), and invisible (IG). Both VG and IG keep the mouse constrained to the window and produce relative motion events. In VG the cursor is visible (duh), in IG it is not. In VG, absolute motion events also work. There are 6 actions that can affect grabbing: 1. Set Fullscreen/Window (F/W). In fullscreen, a visible grab should do nothing. However, a fullscreen visible grab can be treated just like a windowed visible grab, which is what I have done to help simplify things. 2. Cursor hide/show (H/S). If the cursor is hidden when grabbing, the grab is an invisible grab. If the cursor is visible, the grab should just constrain the mouse to the window. 3. Input grab/ungrab(G/U). If grabbed, the cursor should be confined to the window as should the keyboard input. On Mac OS X, the keyboard input is implicitly grabbed by confining the cursor, except for command-tab which can switch away from the application. Should the window come to the foreground if the application is deactivated and grab input is called? This isn't necessary in this implementation because the grab state will be asserted upon activation. Using my notation, these are all the cases that need to be handled (state + action = new state). UG+U = UG UG+G = VG or IG, if cursor is visible or not UG+H = UG UG+S = UG VG+U = UG VG+G = VG VG+H = IG VG+S = VG IG+U = UG IG+G = IG IG+H = IG IG+S = VG The cases that result in the same state can be ignored in the code, which cuts it down to just 5 cases. Another issue is what happens when the app loses/gains input focus from deactivate/activate or iconify/deiconify. I think that if input focus is ever lost (outside of SDL's control), the grab state should be suspended and the cursor should become visible and active again. When regained, the cursor should reappear in its original location and/or grab state. This way, when reactivating the cursor is still in the same position as before so apps shouldn't get confused when the next motion event comes in. This is what I've done in this patch.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 27 Dec 2002 20:52:41 +0000
parents c1666427297c
children 045f186426e1
line wrap: on
line source

/***********************************************************
Copyright 1991 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, 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 names of Digital or MIT 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.

******************************************************************/
/* $XFree86: xc/lib/Xv/Xv.c,v 1.15 2001/05/11 08:23:22 alanh Exp $ */
/*
** File: 
**
**   Xv.c --- Xv library extension module.
**
** Author: 
**
**   David Carver (Digital Workstation Engineering/Project Athena)
**
** Revisions:
**
**   26.06.91 Carver
**     - changed XvFreeAdaptors to XvFreeAdaptorInfo
**     - changed XvFreeEncodings to XvFreeEncodingInfo
**
**   11.06.91 Carver
**     - changed SetPortControl to SetPortAttribute
**     - changed GetPortControl to GetPortAttribute
**     - changed QueryBestSize
**
**   15.05.91 Carver
**     - version 2.0 upgrade
**
**   240.01.91 Carver
**     - version 1.4 upgrade
**
*/

#include <stdio.h>
#include "Xvlibint.h"
#include <X11/extensions/Xext.h>
#include <X11/extensions/XShm.h>
#include "extutil.h"

static XExtensionInfo _xv_info_data;
static XExtensionInfo *xv_info = &_xv_info_data;
static char *xv_extension_name = XvName;

#define XvCheckExtension(dpy, i, val) \
  XextCheckExtension(dpy, i, xv_extension_name, val)

static char *xv_error_string();
static int xv_close_display();
static Bool xv_wire_to_event();

static XExtensionHooks xv_extension_hooks = {
    NULL,                               /* create_gc */
    NULL,                               /* copy_gc */
    NULL,                               /* flush_gc */
    NULL,                               /* free_gc */
    NULL,                               /* create_font */
    NULL,                               /* free_font */
    xv_close_display,                   /* close_display */
    xv_wire_to_event,                   /* wire_to_event */
    NULL,                               /* event_to_wire */
    NULL,                               /* error */
    xv_error_string                     /* error_string */
};


static char *xv_error_list[] = 
{
   "BadPort",	    /* XvBadPort     */
   "BadEncoding",   /* XvBadEncoding */
   "BadControl"     /* XvBadControl  */
};

static XEXT_GENERATE_CLOSE_DISPLAY (xv_close_display, xv_info)


static XEXT_GENERATE_FIND_DISPLAY (xv_find_display, xv_info, 
                                   xv_extension_name, 
                                   &xv_extension_hooks,
				   XvNumEvents, NULL)
     

static XEXT_GENERATE_ERROR_STRING (xv_error_string, xv_extension_name,
                                   XvNumErrors, xv_error_list)


int
SDL_NAME(XvQueryExtension)(
     Display *dpy,
     unsigned int *p_version,
     unsigned int *p_revision,
     unsigned int *p_requestBase,
     unsigned int *p_eventBase,
     unsigned int *p_errorBase
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvQueryExtensionReq *req;
  xvQueryExtensionReply rep;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(QueryExtension, req);

  if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
     UnlockDisplay(dpy);
     SyncHandle();
     return XvBadExtension;
  }

  *p_version = rep.version;
  *p_revision = rep.revision;
  *p_requestBase = info->codes->major_opcode;
  *p_eventBase = info->codes->first_event;
  *p_errorBase = info->codes->first_error;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvQueryAdaptors)(
     Display *dpy,
     Window window,
     unsigned int *p_nAdaptors,
     SDL_NAME(XvAdaptorInfo) **p_pAdaptors
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvQueryAdaptorsReq *req;
  xvQueryAdaptorsReply rep;
  int size,ii,jj;
  char *name;
  SDL_NAME(XvAdaptorInfo) *pas, *pa;
  SDL_NAME(XvFormat) *pfs, *pf;
  char *buffer;
  union 
    {
      char *buffer;
      char *string;
      xvAdaptorInfo *pa;
      xvFormat *pf;
    } u;
  
  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(QueryAdaptors, req);
  req->window = window;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadReply);
  }

  size = rep.length << 2;
  if ( (buffer = (char *)Xmalloc ((unsigned) size)) == NULL) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadAlloc);
  }
  _XRead (dpy, buffer, size);

  u.buffer = buffer;

  /* GET INPUT ADAPTORS */

  if (rep.num_adaptors == 0) {
      pas = NULL;
  } else {
      size = rep.num_adaptors*sizeof(SDL_NAME(XvAdaptorInfo));
      if ((pas=(SDL_NAME(XvAdaptorInfo) *)Xmalloc(size))==NULL) {
          Xfree(buffer);
          UnlockDisplay(dpy);
          SyncHandle();
          return(XvBadAlloc);
      }
  }

  /* INIT ADAPTOR FIELDS */

  pa = pas;
  for (ii=0; ii<rep.num_adaptors; ii++) {
      pa->num_adaptors = 0;
      pa->name = (char *)NULL;
      pa->formats = (SDL_NAME(XvFormat) *)NULL;
      pa++;
  }

  pa = pas;
  for (ii=0; ii<rep.num_adaptors; ii++) {
      pa->type = u.pa->type;
      pa->base_id = u.pa->base_id;
      pa->num_ports = u.pa->num_ports;
      pa->num_formats = u.pa->num_formats;
      pa->num_adaptors = rep.num_adaptors - ii;

      /* GET ADAPTOR NAME */

      size = u.pa->name_size;
      u.buffer += (sz_xvAdaptorInfo + 3) & ~3;

      if ( (name = (char *)Xmalloc(size+1)) == NULL)
	{
	  SDL_NAME(XvFreeAdaptorInfo)(pas);
	  Xfree(buffer);
          UnlockDisplay(dpy);
          SyncHandle();
	  return(XvBadAlloc);
	}
      (void)strncpy(name, u.string, size);
      name[size] = '\0';
      pa->name = name;

      u.buffer += (size + 3) & ~3;

      /* GET FORMATS */

      size = pa->num_formats*sizeof(SDL_NAME(XvFormat));
      if ((pfs=(SDL_NAME(XvFormat) *)Xmalloc(size))==NULL) {
	  SDL_NAME(XvFreeAdaptorInfo)(pas);
	  Xfree(buffer);
          UnlockDisplay(dpy);
          SyncHandle();
	  return(XvBadAlloc);
      }

      pf = pfs;
      for (jj=0; jj<pa->num_formats; jj++) {
	  pf->depth = u.pf->depth;
	  pf->visual_id = u.pf->visual;
	  pf++;
	  
	  u.buffer += (sz_xvFormat + 3) & ~3;
      }

      pa->formats = pfs;

      pa++;

  }

  *p_nAdaptors = rep.num_adaptors;
  *p_pAdaptors = pas;

  Xfree(buffer);
  UnlockDisplay(dpy);
  SyncHandle();

  return (Success);
}


void
SDL_NAME(XvFreeAdaptorInfo)(SDL_NAME(XvAdaptorInfo) *pAdaptors)
{

  SDL_NAME(XvAdaptorInfo) *pa;
  int ii;

  if (!pAdaptors) return;

  pa = pAdaptors;

  for (ii=0; ii<pAdaptors->num_adaptors; ii++, pa++)
    {
      if (pa->name)
	{
	  Xfree(pa->name);
	}
      if (pa->formats)
	{
	  Xfree(pa->formats);
	}
    } 

  Xfree(pAdaptors);
}

int
SDL_NAME(XvQueryEncodings)(
     Display *dpy,
     XvPortID port,
     unsigned int *p_nEncodings,
     SDL_NAME(XvEncodingInfo) **p_pEncodings
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvQueryEncodingsReq *req;
  xvQueryEncodingsReply rep;
  int size, jj;
  char *name;
  SDL_NAME(XvEncodingInfo) *pes, *pe;
  char *buffer;
  union 
    {
      char *buffer;
      char *string;
      xvEncodingInfo *pe;
    } u;
  
  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(QueryEncodings, req);
  req->port = port;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadReply);
  }

  size = rep.length << 2;
  if ( (buffer = (char *)Xmalloc ((unsigned) size)) == NULL) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadAlloc);
  }
  _XRead (dpy, buffer, size);

  u.buffer = buffer;

  /* GET ENCODINGS */

  size = rep.num_encodings*sizeof(SDL_NAME(XvEncodingInfo));
  if ( (pes = (SDL_NAME(XvEncodingInfo) *)Xmalloc(size)) == NULL) {
      Xfree(buffer);
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadAlloc);
  }

  /* INITIALIZE THE ENCODING POINTER */

  pe = pes;
  for (jj=0; jj<rep.num_encodings; jj++) {
      pe->name = (char *)NULL;
      pe->num_encodings = 0;
      pe++;
  }

  pe = pes;
  for (jj=0; jj<rep.num_encodings; jj++) {
      pe->encoding_id = u.pe->encoding;
      pe->width = u.pe->width;
      pe->height = u.pe->height;
      pe->rate.numerator = u.pe->rate.numerator;
      pe->rate.denominator = u.pe->rate.denominator;
      pe->num_encodings = rep.num_encodings - jj;

      size = u.pe->name_size;
      u.buffer += (sz_xvEncodingInfo + 3) & ~3;

      if ( (name = (char *)Xmalloc(size+1)) == NULL) {
	  Xfree(buffer);
          UnlockDisplay(dpy);
          SyncHandle();
	  return(XvBadAlloc);
      }
      strncpy(name, u.string, size);
      name[size] = '\0';
      pe->name = name;
      pe++;

      u.buffer += (size + 3) & ~3;
  }

  *p_nEncodings = rep.num_encodings;
  *p_pEncodings = pes;

  Xfree(buffer);
  UnlockDisplay(dpy);
  SyncHandle();

  return (Success);
}

void
SDL_NAME(XvFreeEncodingInfo)(SDL_NAME(XvEncodingInfo) *pEncodings)
{

  SDL_NAME(XvEncodingInfo) *pe;
  int ii;

  if (!pEncodings) return;

  pe = pEncodings;

  for (ii=0; ii<pEncodings->num_encodings; ii++, pe++) {
      if (pe->name) Xfree(pe->name);
  }

  Xfree(pEncodings);
}

int
SDL_NAME(XvPutVideo)(
     Display *dpy,
     XvPortID port,
     Drawable d,
     GC gc,
     int vx, int vy, 
     unsigned int vw, unsigned int vh,
     int dx, int dy,
     unsigned int dw, unsigned int dh
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvPutVideoReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);
  
  FlushGC(dpy, gc);

  XvGetReq(PutVideo, req);

  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->vid_x = vx;
  req->vid_y = vy;
  req->vid_w = vw;
  req->vid_h = vh;
  req->drw_x = dx;
  req->drw_y = dy;
  req->drw_w = dw;
  req->drw_h = dh;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvPutStill)(
     Display *dpy,
     XvPortID port,
     Drawable d,
     GC gc,
     int vx, int vy, 
     unsigned int vw, unsigned int vh,
     int dx, int dy,
     unsigned int dw, unsigned int dh
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvPutStillReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  FlushGC(dpy, gc);

  XvGetReq(PutStill, req);
  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->vid_x = vx;
  req->vid_y = vy;
  req->vid_w = vw;
  req->vid_h = vh;
  req->drw_x = dx;
  req->drw_y = dy;
  req->drw_w = dw;
  req->drw_h = dh;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvGetVideo)(
     Display *dpy,
     XvPortID port,
     Drawable d,
     GC gc,
     int vx, int vy, 
     unsigned int vw, unsigned int vh,
     int dx, int dy,
     unsigned int dw, unsigned int dh
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvGetVideoReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  FlushGC(dpy, gc);

  XvGetReq(GetVideo, req);
  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->vid_x = vx;
  req->vid_y = vy;
  req->vid_w = vw;
  req->vid_h = vh;
  req->drw_x = dx;
  req->drw_y = dy;
  req->drw_w = dw;
  req->drw_h = dh;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvGetStill)(
     Display *dpy,
     XvPortID port,
     Drawable d,
     GC gc,
     int vx, int vy, 
     unsigned int vw, unsigned int vh,
     int dx, int dy,
     unsigned int dw, unsigned int dh
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvGetStillReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  FlushGC(dpy, gc);

  XvGetReq(GetStill, req);
  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->vid_x = vx;
  req->vid_y = vy;
  req->vid_w = vw;
  req->vid_h = vh;
  req->drw_x = dx;
  req->drw_y = dy;
  req->drw_w = dw;
  req->drw_h = dh;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvStopVideo)(
     Display *dpy,
     XvPortID port,
     Drawable draw
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvStopVideoReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(StopVideo, req);
  req->port = port;
  req->drawable = draw;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvGrabPort)(
     Display *dpy,
     XvPortID port,
     Time time
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  int result;
  xvGrabPortReply rep;
  xvGrabPortReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(GrabPort, req);
  req->port = port;
  req->time = time;

  if (_XReply (dpy, (xReply *) &rep, 0, xTrue) == 0) 
    rep.result = GrabSuccess;

  result = rep.result;

  UnlockDisplay(dpy);
  SyncHandle();

  return result;
}

int
SDL_NAME(XvUngrabPort)(
     Display *dpy,
     XvPortID port,
     Time time
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvUngrabPortReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(UngrabPort, req);
  req->port = port;
  req->time = time;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvSelectVideoNotify)(
     Display *dpy,
     Drawable drawable,
     Bool onoff
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvSelectVideoNotifyReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(SelectVideoNotify, req);
  req->drawable = drawable;
  req->onoff = onoff;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvSelectPortNotify)(
     Display *dpy,
     XvPortID port,
     Bool onoff
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvSelectPortNotifyReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(SelectPortNotify, req);
  req->port = port;
  req->onoff = onoff;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int
SDL_NAME(XvSetPortAttribute) (
     Display *dpy,
     XvPortID port,
     Atom attribute,
     int value
)
{
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvSetPortAttributeReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(SetPortAttribute, req);
  req->port = port;
  req->attribute = attribute;
  req->value = value;

  UnlockDisplay(dpy);
  SyncHandle();

  return (Success);
}

int
SDL_NAME(XvGetPortAttribute) (
     Display *dpy,
     XvPortID port,
     Atom attribute,
     int *p_value
)
{
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvGetPortAttributeReq *req;
  xvGetPortAttributeReply rep;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(GetPortAttribute, req);
  req->port = port;
  req->attribute = attribute;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadReply);
  }

  *p_value = rep.value;
  
  UnlockDisplay(dpy);
  SyncHandle();

  return (Success);
}

int
SDL_NAME(XvQueryBestSize)(
     Display *dpy,
     XvPortID port,
     Bool motion,
     unsigned int vid_w, 
     unsigned int vid_h,
     unsigned int drw_w, 
     unsigned int drw_h,
     unsigned int *p_actual_width, 
     unsigned int *p_actual_height
)
{
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvQueryBestSizeReq *req;
  xvQueryBestSizeReply rep;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  XvGetReq(QueryBestSize, req);
  req->port = port;
  req->motion = motion;
  req->vid_w = vid_w;
  req->vid_h = vid_h;
  req->drw_w = drw_w;
  req->drw_h = drw_h;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return(XvBadReply);
  }

  *p_actual_width = rep.actual_width;
  *p_actual_height = rep.actual_height;

  UnlockDisplay(dpy);
  SyncHandle();

  return (Success);
}


SDL_NAME(XvAttribute)* 
SDL_NAME(XvQueryPortAttributes)(Display *dpy, XvPortID port, int *num)
{
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvQueryPortAttributesReq *req;
  xvQueryPortAttributesReply rep;
  SDL_NAME(XvAttribute) *ret = NULL;

  *num = 0;

  XvCheckExtension(dpy, info, NULL);

  LockDisplay(dpy);

  XvGetReq(QueryPortAttributes, req);
  req->port = port;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return ret;
  }

  if(rep.num_attributes) {
      int size = (rep.num_attributes * sizeof(SDL_NAME(XvAttribute))) + rep.text_size;

      if((ret = Xmalloc(size))) {
	  char* marker = (char*)(&ret[rep.num_attributes]);
	  xvAttributeInfo Info;
	  int i;
	
	  for(i = 0; i < rep.num_attributes; i++) {
             _XRead(dpy, (char*)(&Info), sz_xvAttributeInfo);
	      ret[i].flags = (int)Info.flags;	      
	      ret[i].min_value = Info.min;	      
	      ret[i].max_value = Info.max;	      
	      ret[i].name = marker;
	      _XRead(dpy, marker, Info.size);
	      marker += Info.size;
	      (*num)++;
	  }
      } else
	_XEatData(dpy, rep.length << 2);
  }

  UnlockDisplay(dpy);
  SyncHandle();

  return ret;
}

SDL_NAME(XvImageFormatValues) * SDL_NAME(XvListImageFormats) (
   Display 	*dpy,
   XvPortID 	port,
   int 		*num
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvListImageFormatsReq *req;
  xvListImageFormatsReply rep;
  SDL_NAME(XvImageFormatValues) *ret = NULL;

  *num = 0;

  XvCheckExtension(dpy, info, NULL);

  LockDisplay(dpy);

  XvGetReq(ListImageFormats, req);
  req->port = port;

  /* READ THE REPLY */

  if (_XReply(dpy, (xReply *)&rep, 0, xFalse) == 0) {
      UnlockDisplay(dpy);
      SyncHandle();
      return NULL;
  }

  if(rep.num_formats) {
      int size = (rep.num_formats * sizeof(SDL_NAME(XvImageFormatValues)));

      if((ret = Xmalloc(size))) {
	  xvImageFormatInfo Info;
	  int i;
	
	  for(i = 0; i < rep.num_formats; i++) {
              _XRead(dpy, (char*)(&Info), sz_xvImageFormatInfo);
	      ret[i].id = Info.id;	      
	      ret[i].type = Info.type;	      
	      ret[i].byte_order = Info.byte_order;	      
	      memcpy(&(ret[i].guid[0]), &(Info.guid[0]), 16);
	      ret[i].bits_per_pixel = Info.bpp;	      
  	      ret[i].format = Info.format;	      
   	      ret[i].num_planes = Info.num_planes;	      
    	      ret[i].depth = Info.depth;	      
    	      ret[i].red_mask = Info.red_mask;	      
    	      ret[i].green_mask = Info.green_mask;	      
    	      ret[i].blue_mask = Info.blue_mask;	      
    	      ret[i].y_sample_bits = Info.y_sample_bits;	      
    	      ret[i].u_sample_bits = Info.u_sample_bits;	      
    	      ret[i].v_sample_bits = Info.v_sample_bits;
    	      ret[i].horz_y_period = Info.horz_y_period;
    	      ret[i].horz_u_period = Info.horz_u_period;
    	      ret[i].horz_v_period = Info.horz_v_period;
    	      ret[i].vert_y_period = Info.vert_y_period;
    	      ret[i].vert_u_period = Info.vert_u_period;
    	      ret[i].vert_v_period = Info.vert_v_period;
	      memcpy(&(ret[i].component_order[0]), &(Info.comp_order[0]), 32);
    	      ret[i].scanline_order = Info.scanline_order;
	      (*num)++;
	  }
      } else
	_XEatData(dpy, rep.length << 2);
  }

  UnlockDisplay(dpy);
  SyncHandle();

  return ret;
}

SDL_NAME(XvImage) * SDL_NAME(XvCreateImage) (
   Display *dpy,
   XvPortID port,
   int id,
   char *data,
   int width, 
   int height 
) {
   XExtDisplayInfo *info = xv_find_display(dpy);
   xvQueryImageAttributesReq *req;
   xvQueryImageAttributesReply rep;
   SDL_NAME(XvImage) *ret = NULL;

   XvCheckExtension(dpy, info, NULL);

   LockDisplay(dpy);

   XvGetReq(QueryImageAttributes, req);
   req->id = id;
   req->port = port;
   req->width = width;
   req->height = height;

   /* READ THE REPLY */

   if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
       UnlockDisplay(dpy);
       SyncHandle();
      return NULL;
   }

   if((ret = (SDL_NAME(XvImage)*)Xmalloc(sizeof(SDL_NAME(XvImage)) + (rep.num_planes << 3)))) {
	ret->id = id;
	ret->width = rep.width;
	ret->height = rep.height;
	ret->data_size = rep.data_size;
	ret->num_planes = rep.num_planes;
	ret->pitches = (int*)(&ret[1]);
	ret->offsets = ret->pitches + rep.num_planes;
	ret->data = data;
	ret->obdata = NULL;
  	_XRead(dpy, (char*)(ret->pitches), rep.num_planes << 2);
	_XRead(dpy, (char*)(ret->offsets), rep.num_planes << 2);
   } else
	_XEatData(dpy, rep.length << 2);

   UnlockDisplay(dpy);
   SyncHandle();
   return ret;
}

SDL_NAME(XvImage) * SDL_NAME(XvShmCreateImage) (
   Display *dpy,
   XvPortID port,
   int id,
   char *data,
   int width, 
   int height,
   XShmSegmentInfo *shminfo
){
   SDL_NAME(XvImage) *ret;

   ret = SDL_NAME(XvCreateImage)(dpy, port, id, data, width, height);

   if(ret) ret->obdata = (XPointer)shminfo;

   return ret;
}

int SDL_NAME(XvPutImage) (
   Display *dpy,
   XvPortID port,
   Drawable d,
   GC gc,
   SDL_NAME(XvImage) *image,
   int src_x,
   int src_y,
   unsigned int src_w,
   unsigned int src_h,
   int dest_x, 
   int dest_y,
   unsigned int dest_w,
   unsigned int dest_h
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  xvPutImageReq *req;
  int len;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);

  FlushGC(dpy, gc);

  XvGetReq(PutImage, req);

  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->id = image->id;
  req->src_x = src_x;
  req->src_y = src_y;
  req->src_w = src_w;
  req->src_h = src_h;
  req->drw_x = dest_x;
  req->drw_y = dest_y;
  req->drw_w = dest_w;
  req->drw_h = dest_h;
  req->width = image->width;
  req->height = image->height;

  len = (image->data_size + 3) >> 2;
  SetReqLen(req, len, len);

  /* Yes it's kindof lame that we are sending the whole thing,
     but for video all of it may be needed even if displaying
     only a subsection, and I don't want to go through the 
     trouble of creating subregions to send */
  Data(dpy, (char *)image->data, image->data_size);

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}

int SDL_NAME(XvShmPutImage) (
   Display *dpy,
   XvPortID port,
   Drawable d,
   GC gc,
   SDL_NAME(XvImage) *image,
   int src_x,
   int src_y,
   unsigned int src_w,
   unsigned int src_h,
   int dest_x, 
   int dest_y,
   unsigned int dest_w,
   unsigned int dest_h,
   Bool send_event
){
  XExtDisplayInfo *info = xv_find_display(dpy);
  XShmSegmentInfo *shminfo = (XShmSegmentInfo *)image->obdata;
  xvShmPutImageReq *req;

  XvCheckExtension(dpy, info, XvBadExtension);

  LockDisplay(dpy);
  
  FlushGC(dpy, gc);

  XvGetReq(ShmPutImage, req);

  req->port = port;
  req->drawable = d;
  req->gc = gc->gid;
  req->shmseg = shminfo->shmseg;
  req->id = image->id;
  req->src_x = src_x;
  req->src_y = src_y;
  req->src_w = src_w;
  req->src_h = src_h;
  req->drw_x = dest_x;
  req->drw_y = dest_y;
  req->drw_w = dest_w;
  req->drw_h = dest_h;
  req->offset = image->data - shminfo->shmaddr;
  req->width = image->width;
  req->height = image->height;
  req->send_event = send_event;

  UnlockDisplay(dpy);
  SyncHandle();

  return Success;
}


static Bool
xv_wire_to_event(Display *dpy, XEvent *host, xEvent *wire)
{
  XExtDisplayInfo *info = xv_find_display(dpy);
  SDL_NAME(XvEvent) *re    = (SDL_NAME(XvEvent) *)host;
  xvEvent *event = (xvEvent *)wire;

  XvCheckExtension(dpy, info, False);

  switch((event->u.u.type & 0x7F) - info->codes->first_event)
  {
    case XvVideoNotify:
      re->xvvideo.type = event->u.u.type & 0x7f;
      re->xvvideo.serial = 
	_XSetLastRequestRead(dpy, (xGenericReply *)event);
      re->xvvideo.send_event = ((event->u.u.type & 0x80) != 0);
      re->xvvideo.display = dpy;
      re->xvvideo.time = event->u.videoNotify.time;
      re->xvvideo.reason = event->u.videoNotify.reason;
      re->xvvideo.drawable = event->u.videoNotify.drawable;
      re->xvvideo.port_id = event->u.videoNotify.port;
      break;
    case XvPortNotify:
      re->xvport.type = event->u.u.type & 0x7f;
      re->xvport.serial = 
	_XSetLastRequestRead(dpy, (xGenericReply *)event);
      re->xvport.send_event = ((event->u.u.type & 0x80) != 0);
      re->xvport.display = dpy;
      re->xvport.time = event->u.portNotify.time;
      re->xvport.port_id = event->u.portNotify.port;
      re->xvport.attribute = event->u.portNotify.attribute;
      re->xvport.value = event->u.portNotify.value;
      break;
    default:
      return False; 
  }

  return (True);
}