/* $Id: drv_X11.c,v 1.9 2004/11/29 04:42:07 reinelt Exp $
 *
 * new style X11 Driver for LCD4Linux 
 *
 * Copyright 1999-2004 Michael Reinelt <reinelt@eunet.at>
 * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * based on the old XWindow.c which is
 * Copyright 2000 Herbert Rosmanith <herp@wildsau.idv.uni-linz.ac.at>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: drv_X11.c,v $
 * Revision 1.9  2004/11/29 04:42:07  reinelt
 * removed the 99999 msec limit on widget update time (thanks to Petri Damsten)
 *
 * Revision 1.8  2004/06/26 12:04:59  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.7  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.6  2004/06/20 10:09:54  reinelt
 *
 * 'const'ified the whole source
 *
 * Revision 1.5  2004/06/08 21:46:38  reinelt
 *
 * splash screen for X11 driver (and generic graphic driver)
 *
 * Revision 1.4  2004/06/06 06:51:59  reinelt
 *
 * do not display end splash screen if quiet=1
 *
 * Revision 1.3  2004/06/02 09:41:19  reinelt
 *
 * prepared support for startup splash screen
 *
 * Revision 1.2  2004/05/25 14:26:29  reinelt
 *
 * added "Image" driver (was: Raster.c) for PPM and PNG creation
 * fixed some glitches in the X11 driver
 *
 * Revision 1.1  2004/02/24 05:55:04  reinelt
 *
 * X11 driver ported
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_X11
 *
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#include "debug.h"
#include "cfg.h"
#include "qprintf.h"
#include "timer.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic_graphic.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

static char Name[]="X11";

static char *fg_col,*bg_col,*hg_col;

static int pixel  = -1;	/* pointsize in pixel */
static int pgap   =  0;	/* gap between points */
static int rgap   =  0;	/* row gap between lines */
static int cgap   =  0;	/* column gap between characters */
static int border =  0;	/* window border */

static int dimx, dimy;	/* total window dimension in pixel */

static unsigned char *drv_X11_FB=NULL;

static Display *dp;
static int sc, dd;
static Window w, rw;
static Visual *vi;
static GC fg_gc, bg_gc, hg_gc;
static Colormap cm;
static XColor fg_xc, bg_xc, hg_xc;
static Pixmap pm;


/****************************************/
/***  hardware dependant functions    ***/
/****************************************/

static void drv_X11_blit(const int row, const int col, const int height, const int width)
{
  int r, c;
  int dirty = 0;

  for (r=row; r<row+height && r<DROWS; r++) {
    int y = border + (r/YRES)*rgap + r*(pixel+pgap);
    for (c=col; c<col+width && c<DCOLS; c++) {
      int x = border + (c/XRES)*cgap + c*(pixel+pgap);
      unsigned char p = drv_generic_graphic_FB[r*LCOLS+c];
      if (drv_X11_FB[r*DCOLS+c] != p) {
	XFillRectangle( dp, w, p? fg_gc:hg_gc, x, y, pixel, pixel);
	drv_X11_FB[r*DCOLS+c] = p;
	dirty=1;
      }
    }
  }
  if (dirty) {
    XSync(dp, False);
  }
}


static void drv_X11_expose(const int x, const int y, const int width, const int height)
{
  /*
   * theory of operation:
   * instead of the old, fully-featured but complicated update
   * region calculation, we do an update of the whole display,
   * but check before every pixel if the pixel region is inside
   * the update region.
   */
  
  int r,  c;
  int x0, y0;
  int x1, y1;
  
  x0 = x-pixel;
  x1 = x+pixel+width;
  y0 = y-pixel;
  y1 = y+pixel+height;

  for (r=0; r<DROWS; r++) {
    int yc = border + (r/YRES)*rgap + r*(pixel+pgap);
    if (yc<y0 || yc>y1) continue;
    for (c=0; c<DCOLS; c++) {
      int xc = border + (c/XRES)*cgap + c*(pixel+pgap);
      if (xc<x0 || xc>x1) continue;
      XFillRectangle( dp, w, drv_generic_graphic_FB[r*LCOLS+c]? fg_gc:hg_gc, xc, yc, pixel, pixel);
    }
  }
  XSync(dp, False);
}


static void drv_X11_timer (__attribute__((unused)) void *notused)
{
  XEvent ev;
  
  if (XCheckWindowEvent(dp, w, ExposureMask, &ev)==0) return;
  if (ev.type==Expose) {
    drv_X11_expose (ev.xexpose.x, ev.xexpose.y, ev.xexpose.width, ev.xexpose.height);
  }
}


static int drv_X11_start (const char *section)
{
  char *s;
  XSetWindowAttributes wa;
  XSizeHints sh;
  XColor dummy;
  XEvent ev;


  /* read display size from config */
  if (sscanf(s=cfg_get(section, "Size", "120x32"), "%dx%d", &DCOLS, &DROWS)!=2 || DCOLS<1 || DROWS<1) {
    error ("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());
    free(s);
    return -1;
  }
  free(s);
  
  if (sscanf(s=cfg_get(section, "font", "5x8"), "%dx%d", &XRES, &YRES)!=2 || XRES<1|| YRES<1) {
    error ("%s: bad %s.font '%s' from %s", Name, section, s, cfg_source());
    free(s);
    return -1;
  }
  free(s);
  
  if (sscanf(s=cfg_get(section, "pixel", "4+1"), "%d+%d", &pixel, &pgap)!=2 || pixel<1 || pgap<0) {
    error ("%s: bad %s.pixel '%s' from %s", Name, section, s, cfg_source());
    free(s);
    return -1;
  }
  free(s);
  
  if (sscanf(s=cfg_get(section, "gap", "-1x-1"), "%dx%d", &cgap, &rgap)!=2 || cgap<-1 || rgap<-1) {
    error ("%s: bad %s.gap '%s' from %s", Name, section, s, cfg_source());
    free(s);
    return -1;
  }
  free(s);

  if (rgap<0) rgap=pixel+pgap;
  if (cgap<0) cgap=pixel+pgap;
  
  if (cfg_number(section, "border", 0, 0, -1, &border)<0) return -1;

  fg_col = cfg_get(section, "foreground", "#000000");
  bg_col = cfg_get(section, "background", "#80d000");
  hg_col = cfg_get(section, "halfground", "#70c000");
  if (*fg_col=='\\') fg_col++;
  if (*bg_col=='\\') bg_col++;
  if (*hg_col=='\\') hg_col++;


  drv_X11_FB = malloc(DCOLS*DROWS);
  if (drv_X11_FB==NULL) {
    error ("%s: framebuffer could not be allocated: malloc() failed", Name);
    return -1;
  }

  /* init with 255 so all 'halfground' pixels will be drawn */
  memset(drv_X11_FB, 255, DCOLS*DROWS*sizeof(*drv_X11_FB));

  if ((dp=XOpenDisplay(NULL))==NULL) {
    error ("%s: can't open display", Name);
    return -1;
  }
  
  sc    = DefaultScreen(dp);
  fg_gc = DefaultGC(dp, sc);
  vi    = DefaultVisual(dp, sc);
  dd    = DefaultDepth(dp, sc);
  rw    = DefaultRootWindow(dp);
  cm    = DefaultColormap(dp, sc);

  if (XAllocNamedColor(dp, cm, fg_col, &fg_xc, &dummy) == False) {
    error ("%s: can't alloc foreground color '%s'", Name, fg_col);
    return -1;
  }
  
  if (XAllocNamedColor(dp, cm, bg_col, &bg_xc, &dummy)==False) {
    error ("%s: can't alloc background color '%s'", Name, bg_col);
    return -1;
  }
  
  if (XAllocNamedColor(dp, cm, hg_col, &hg_xc, &dummy)==False) {
    error ("%s: can't alloc halfground color '%s'", Name, hg_col);
    return -1;
  }
  
  dimx = DCOLS*pixel + (DCOLS-1)*pgap + (DCOLS/XRES-1)*cgap;
  dimy = DROWS*pixel + (DROWS-1)*pgap + (DROWS/YRES-1)*rgap;

  wa.event_mask=ExposureMask;

  w = XCreateWindow(dp, rw, 0, 0, dimx+2*border, dimy+2*border, 0, 0, InputOutput, vi, CWEventMask, &wa);

  pm = XCreatePixmap(dp, w, dimx, dimy, dd);

  sh.min_width  = sh.max_width  = dimx+2*border;
  sh.min_height = sh.max_height = dimy+2*border;
  sh.flags = PPosition|PSize|PMinSize|PMaxSize;
  
  XSetWMProperties(dp, w, NULL, NULL, NULL, 0, &sh, NULL, NULL);


  XSetForeground(dp, fg_gc, fg_xc.pixel);
  XSetBackground(dp, fg_gc, bg_xc.pixel);

  bg_gc = XCreateGC(dp, w, 0, NULL);
  XSetForeground(dp, bg_gc, bg_xc.pixel);
  XSetBackground(dp, bg_gc, fg_xc.pixel);

  hg_gc = XCreateGC(dp, w, 0, NULL);
  XSetForeground(dp, hg_gc, hg_xc.pixel);
  XSetBackground(dp, hg_gc, fg_xc.pixel);

  XFillRectangle(dp, pm, bg_gc, 0, 0, dimx+2*border, dimy+2*border);
  XSetWindowBackground(dp, w, bg_xc.pixel);
  XClearWindow(dp, w);

  XStoreName(dp, w, "LCD4Linux");
  XMapWindow(dp, w);

  XFlush(dp);

  while(1) {
    XNextEvent(dp,&ev);
    if (ev.type==Expose && ev.xexpose.count==0)
      break;
  }
  
  /* regularly process X events */
  /* Fixme: make 20msec configurable */
  timer_add (drv_X11_timer, NULL, 20, 0);

  return 0;
}



/****************************************/
/***            plugins               ***/
/****************************************/

/* none at the moment... */


/****************************************/
/***        widget callbacks          ***/
/****************************************/


/* using drv_generic_graphic_draw(W) */
/* using drv_generic_graphic_icon_draw(W) */
/* using drv_generic_graphic_bar_draw(W) */


/****************************************/
/***        exported functions        ***/
/****************************************/


/* list models */
int drv_X11_list (void)
{
  printf ("any");
  return 0;
}


/* initialize driver & display */
int drv_X11_init (const char *section, const int quiet)
{
  WIDGET_CLASS wc;
  int ret;  
  
  /* real worker functions */
  drv_generic_graphic_real_blit = drv_X11_blit;
  
  /* start display */
  if ((ret=drv_X11_start (section))!=0)
    return ret;
  
  /* initialize generic graphic driver */
  if ((ret=drv_generic_graphic_init(section, Name))!=0)
    return ret;
  
  /* initially expose window */
  drv_generic_graphic_clear();
  drv_X11_expose (0, 0, dimx+2*border, dimy+2*border);
  
  if (!quiet) {
    char buffer[40];
    qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
    if (drv_generic_graphic_greet (buffer, NULL)) {
      sleep (3);
      drv_generic_graphic_clear();
    }
  }

  /* register text widget */
  wc=Widget_Text;
  wc.draw=drv_generic_graphic_draw;
  widget_register(&wc);
  
  /* register icon widget */
  wc=Widget_Icon;
  wc.draw=drv_generic_graphic_icon_draw;
  widget_register(&wc);
  
  /* register bar widget */
  wc=Widget_Bar;
  wc.draw=drv_generic_graphic_bar_draw;
  widget_register(&wc);
  
  /* register plugins */
  /* none at the moment... */
  
  
  return 0;
}


/* close driver & display */
int drv_X11_quit (const __attribute__((unused)) int quiet) {

  info("%s: shutting down.", Name);
  drv_generic_graphic_quit();
  
  if (drv_X11_FB) {
    free (drv_X11_FB);
    drv_X11_FB=NULL;
  }
  
  return (0);
}


DRIVER drv_X11 = {
  name: Name,
  list: drv_X11_list,
  init: drv_X11_init,
  quit: drv_X11_quit, 
};