/*
   Copyright (c) 1991 - 1994 Michael Schoene & Heinz W. Werntges.
   Parts Copyright (c) 1999  Martin Kroeker.
   
   All rights reserved. Distributed by Free Software Foundation, Inc.

This file is part of HP2xx.

HP2xx is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the GNU General Public License, Version 2 or later, for full details.

Everyone is granted permission to copy, modify and redistribute
HP2xx, but only under the conditions described in the GNU General Public
License.  A copy of this license is supposed to have been
given to you along with HP2xx so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/

/** to_x11.c: X11 preview part of project "hp2xx" (UNIX only)
 **
 ** 92/01/15  V 1.00  HWW  Derived from to_vga.c (V1.01b)
 **			  X11 essentials due to M. Schoene
 ** 92/01/28  V 1.01  HWW  Window offset user-defined via -o -O
 ** 92/02/03  V 1.02  HWW  bug fixes, error handling
 ** 92/05/19  V 1.02b HWW  Abort if color mode
 ** 92/05/25  V 1.10  HWW  8 Colors supported
 ** 93/01/06  V 1.10b HWW  Improved selection of foreground color
 ** 94/02/14  V 1.20a HWW  Adapted to changes in hp2xx.h
 ** 01/04/22          YuS  Exit on button and key events
 **
 **	      NOTE: Color assignment leaves something to be desired
 **		    with some X11 servers.
 **/


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#include "bresnham.h"
#include "pendef.h"
#include "hp2xx.h"
#include "x11.h"



#define WIN_NAME	"x11"	/* Window name          */
#define PROG_NAME	"hp2xx"	/* Program name                 */



/**
 ** Global variables for X11
 **/

static Display *XDisplay = NULL;	/* Workstation id       */
static int XScreen;
static Window XRoot;		/* Number of root window        */
static Visual *XVisual = NULL;

static GC XGcWin;
static Window XWin;		/* Window id            */

static unsigned long col_table[CMS_SIZE];
static XColor Xcol;
static Colormap def_clut;

/**
 ** Screen sizes
 **/

static int scr_width;
static int scr_height;

/**
 ** Window sizes
 **/

static int width;
static int bytes;
static int height;

/* Added by YuS 22 April 2001 */
XEvent WaitEvent;

static int row_start = 0;
static int col_start = 0;
static int oversized = 0;
static int zoomed = 0;
/**
 ** Initialize X11 and open window
 **/

static int
win_open (const GEN_PAR * pg, char *title, int x, int y, int w, int h)
{
  char *DisplayName = NULL;
  char **argv;
  XSizeHints Hints;
  unsigned long ValueMask;
  XSetWindowAttributes WinAttr;
  XEvent Event;
  char colorname[13];
  int i;

	/**
	 ** Simulate command line arguments
	 **/

  argv = (char **) malloc (3 * sizeof (char *));
  argv[0] = PROG_NAME;
  argv[1] = title;
  argv[2] = NULL;

	/**
	 ** X11 server reachable ?
	 **/

  if ((XDisplay = (Display *) XOpenDisplay (DisplayName)) == NULL)
    {
      Eprintf ("No X11 server found !\n");
      return NO_SERVER;
    }



  XScreen = DefaultScreen (XDisplay);
  XRoot = RootWindow (XDisplay, XScreen);
  XVisual = DefaultVisual (XDisplay, XScreen);
  XGcWin = DefaultGC (XDisplay, XScreen);

  scr_width = WidthOfScreen (ScreenOfDisplay (XDisplay, XScreen));
  scr_height = HeightOfScreen (ScreenOfDisplay (XDisplay, XScreen));
  if (x + w > scr_width || y + h > scr_height)
    {
  if (!pg->quiet)
      Eprintf ("Window exceeds screen limits, use mouse button 1 to pan\n");
      w = MIN (w, scr_width);
      h = MIN (h, scr_height);
      oversized = 1;
/*		return SIZE;*/
    }

	/**
	 ** Set window attributes
	 **/

  WinAttr.background_pixel = WhitePixel (XDisplay, XScreen);
  WinAttr.border_pixel = WhitePixel (XDisplay, XScreen);
  WinAttr.backing_store = Always;
  ValueMask = CWBackPixel | CWBorderPixel | CWBackingStore;

	/**
	 ** Create Window
	 **/

  XWin = XCreateWindow (XDisplay, XRoot,
			x, y, w, h,
			1, 0,
			CopyFromParent, CopyFromParent, ValueMask, &WinAttr);

	/**
	 ** Define window properties
	 **/

  Hints.flags = PSize | PMinSize | PMaxSize | USPosition;
  Hints.x = x;
  Hints.y = y;
  Hints.width = Hints.min_width = Hints.max_width = w;
  Hints.height = Hints.min_height = Hints.max_height = h;

  XSetStandardProperties (XDisplay, XWin,
			  title, title, 0, argv, 2, &Hints);

/**
 ** Define color table (compatible to SunView and Turbo-C usage)
 **/

  def_clut = DefaultColormap (XDisplay, XScreen);
  if (DefaultDepth (XDisplay, XScreen) < 4)
    {
      col_table[BLACK] = WhitePixel (XDisplay, XScreen);
      col_table[WHITE] = BlackPixel (XDisplay, XScreen);
      col_table[GRAY] = col_table[WHITE];
      col_table[RED] = col_table[WHITE];
      col_table[GREEN] = col_table[WHITE];
      col_table[BLUE] = col_table[WHITE];
      col_table[CYAN] = col_table[WHITE];
      col_table[MAGENTA] = col_table[WHITE];
      col_table[YELLOW] = col_table[WHITE];
      col_table[LIGHTGRAY] = col_table[WHITE];
      col_table[LIGHTRED] = col_table[WHITE];
      col_table[LIGHTGREEN] = col_table[WHITE];
      col_table[LIGHTBLUE] = col_table[WHITE];
      col_table[LIGHTCYAN] = col_table[WHITE];
      col_table[LIGHTMAGENTA] = col_table[WHITE];
    }
  else
    {
      XParseColor (XDisplay, def_clut, "gray10", &Xcol);
      XAllocColor (XDisplay, def_clut, &Xcol);
      col_table[GRAY] = Xcol.pixel;

      for (i = 1; i <= pg->maxpens; i++)
	{
	  sprintf (colorname, "#%2.2X%2.2X%2.2X",
		   pt.clut[i][0], pt.clut[i][1], pt.clut[i][2]);
	  if (XParseColor (XDisplay, def_clut, colorname, &Xcol)==0) fprintf(stderr,"failed tp map color for pen %d\n",i);
	if (XAllocColor (XDisplay, def_clut, &Xcol)==0) {
	fprintf(stderr,"failed to alloc X color for pen %d\n",i);
	col_table[i] = col_table[GRAY];
	}else
	  col_table[i] = Xcol.pixel;
	}
    }


	/**
	 **  Set foreground and background colors
	 **/

  XSetState (XDisplay, XGcWin,
	     col_table[BLACK], col_table[WHITE], GXcopy, AllPlanes);

	/**
	 ** Define permitted events for this window
	 **/

  XSelectInput (XDisplay, XWin,
		ExposureMask  | KeyPressMask | VisibilityChangeMask |
		ButtonPressMask | ButtonReleaseMask);

	/**
	 ** Display window
	 **/
  XMapWindow (XDisplay, XWin);
  do
    {
      XNextEvent (XDisplay, &Event);
    }
  while (Event.type != Expose && Event.type != VisibilityNotify );

  width = w;
  height = h;
  bytes = (w + 7) / 8;


  free ((char *) argv);
  return (0);
}



void
win_close ()
{
  XDestroyWindow (XDisplay, XWin);
  XCloseDisplay (XDisplay);
}




#define	setXcolor(col) XSetForeground (XDisplay, XGcWin, col_table[col])




int
PicBuf_to_X11 ( const GEN_PAR * pg,  OUT_PAR * po)
/**
 ** Interface to higher-level routines,
 **   similar in structure to other previewers
 **/
{
  int row_c, x, y;
  int saved_col=0,saved_row=0;
  int xref = 0, yref = 0;
  const RowBuf *row;
  const PicBuf *pb;
  struct timeval tv;
  tv.tv_usec = 10;

  if (pg == NULL || po == NULL)
    return ERROR;
  pb = po->picbuf;
  if (pb == NULL)
    return ERROR;

  if (!pg->quiet)
    {
      Eprintf ("\nX11 preview follows.\n");
      Eprintf ("Press any key to end graphics mode\n");
    }

  if (win_open (pg, po->outfile, (int) (po->xoff * po->dpi_x / 25.4),
		(int) (po->yoff * po->dpi_y / 25.4), pb->nb << 3, pb->nr))
    return ERROR;
REDRAW:
  /* Backward since highest index is lowest line on screen! */
  for (row_c = row_start, y = MIN (height-row_start, pb->nr - 1);
       row_c < pb->nr; row_c++, y--)
    {
   row =NULL;
   if (row_c>=0) row = get_RowBuf (pb, row_c);
      /*if (row == NULL)
	return 0;*/
      for (x = col_start; x < pb->nc; x++)
	{
        if (row_c <0 || x < 0) setXcolor(GRAY);
         else
	  switch (index_from_RowBuf (row, x, pb))
	    {

	    case xxBackground:
	      continue;
/*	    case xxForeground:
	      setXcolor (WHITE);
	      break;*/
	    default:
	      setXcolor (index_from_RowBuf (row, x, pb));
	      break;
	    }
	  XDrawPoint (XDisplay, XWin, XGcWin, x - col_start, y + row_start);
	}
    }

/* Wait for KeyPress or mouse Button  - exit on keypress or button 3 */
  do
    {
      XNextEvent (XDisplay, &WaitEvent);
      if (WaitEvent.type == ButtonPress)
	{
	  if (WaitEvent.xbutton.button == Button1)
	    {
	      xref = WaitEvent.xbutton.x;
	      yref = WaitEvent.xbutton.y;
	    }
	  if (WaitEvent.xbutton.button == Button2)
	    {
	    if (!zoomed){
	      zoomed=1;
	       po->HP_to_xdots *=2;
	       po->HP_to_ydots *=2;
	       po->dpi_x *=2;
	       po->dpi_y *=2;
		saved_row=row_start;
		saved_col=col_start;
		  row_start = height-WaitEvent.xbutton.y+2*saved_row;
		  if (height < scr_height) row_start = height-WaitEvent.xbutton.y;
		  col_start =  WaitEvent.xbutton.x+col_start;
	    } else {
	      zoomed=0;
	      po->dpi_x = po->dpi_x/2;
	      po->dpi_y = po->dpi_y/2;
	       po->HP_to_xdots = po->HP_to_xdots/2;
	       po->HP_to_ydots = po->HP_to_ydots/2;
		row_start=saved_row;
		col_start=saved_col;

		}	
		free(po->picbuf);
		po->picbuf=NULL;    
	      TMP_to_BUF(pg, po);
	      pb=po->picbuf;
	    }
	  if (WaitEvent.xbutton.button == Button3) {win_close();return(0);}
	}
      else if (WaitEvent.type == ButtonRelease)
	{
	  if (WaitEvent.xbutton.button == Button1)
	    {
	      if (oversized)
		{
		  row_start += WaitEvent.xbutton.y - yref;
		  col_start += xref - WaitEvent.xbutton.x;
		}
	      XSetForeground (XDisplay, XGcWin,
			      WhitePixel (XDisplay, XScreen));
	      XFillRectangle (XDisplay, XWin, XGcWin, 0, 0, scr_width,
			      scr_height);
	      goto REDRAW;	/* yes, goto in C is ugly */
	    }
	  if (WaitEvent.xbutton.button == Button2){
	      XSetForeground (XDisplay, XGcWin,
			      WhitePixel (XDisplay, XScreen));
	      XFillRectangle (XDisplay, XWin, XGcWin, 0, 0, scr_width,
			      scr_height);
	      goto REDRAW;	/* yes, goto in C is ugly */
		} 	
	  break;
/*	  select (0, NULL, NULL, NULL, &tv);*/
	}
    }
  while (WaitEvent.type != KeyPress );

  win_close ();
  return 0;
}
