/*--------------------------------*-C-*---------------------------------*
 * File:	graphics.c
 *
 * This module is all new by Rob Nation
 * <nation@rocket.sanders.lockheed.com>
 *
 * Modifications by mj olesen <olesen@me.QueensU.CA>
 * and Raul Garcia Garcia <rgg@tid.es>
 *----------------------------------------------------------------------*/

static const char cvs_ident[] = "$Id$";

#include "config.h"
#include "feature.h"

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <X11/cursorfont.h>

#include "command.h"		/* for tt_printf() */
#include "debug.h"
#include "graphics.h"
#include "main.h"
#include "screen.h"

/* commands:
 * 'C' = Clear
 * 'F' = Fill
 * 'G' = Geometry
 * 'L' = Line
 * 'P' = Points
 * 'T' = Text
 * 'W' = Window
 */

#ifndef GRX_SCALE
# define GRX_SCALE	10000
#endif

/* extern functions referenced */
/* extern variables referenced */
/* extern variables declared here */

#ifdef RXVT_GRAPHICS
/* local variables */
static int graphics_up = 0;

typedef struct grcmd_t {
  char cmd;
  short color;
  short ncoords;
  int *coords;
  unsigned char *text;
  struct grcmd_t *next;
} grcmd_t;

typedef struct grwin_t {
  Window win;
  int x, y;
  unsigned int w, h;
  short screen;
  grcmd_t *graphics;
  struct grwin_t *prev, *next;
} grwin_t;

static grwin_t *gr_root = NULL;

/*----------------------------------------------------------------------*
 * local functions
 */
/* Gr_NewWindow() */
static void
Gr_NewWindow(int nargs, int args[])
{
  int x, y;
  unsigned int w, h;
  Window win;
  grwin_t *grwin;
  Cursor cursor;

  if (nargs != 4) {
    print_error("NewWindow: 4 args needed, got %d\n", nargs);
    return;
  }
  x = args[0] * TermWin.width / GRX_SCALE + TermWin.internalBorder;
  y = args[1] * TermWin.height / GRX_SCALE + TermWin.internalBorder;
  w = args[2] * TermWin.width / GRX_SCALE;
  h = args[3] * TermWin.height / GRX_SCALE;

  win = XCreateSimpleWindow(Xdisplay, TermWin.vt,
			    x, y, w, h,
			    0,
			    PixColors[fgColor],
			    PixColors[bgColor]);

  cursor = XCreateFontCursor(Xdisplay, XC_crosshair);
  XDefineCursor(Xdisplay, win, cursor);
  XMapWindow(Xdisplay, win);
  XSelectInput(Xdisplay, win, ExposureMask);

  grwin = (grwin_t *) MALLOC(sizeof(grwin_t));
  grwin->win = win;
  grwin->x = x;
  grwin->y = y;
  grwin->w = w;
  grwin->h = h;
  grwin->screen = 0;
  grwin->prev = NULL;
  grwin->next = gr_root;
  if (grwin->next)
    grwin->next->prev = grwin;
  gr_root = grwin;
  grwin->graphics = NULL;
  graphics_up++;

  tt_printf("\033W%ld\n", (long) grwin->win);
}

/* Gr_ClearWindow() */
static void
Gr_ClearWindow(grwin_t * grwin)
{
  grcmd_t *cmd, *next;

  for (cmd = grwin->graphics; cmd != NULL; cmd = next) {
    next = cmd->next;
    free(cmd->coords);
    if (cmd->text != NULL)
      free(cmd->text);
    free(cmd);
  }
  grwin->graphics = NULL;
  XClearWindow(Xdisplay, grwin->win);
}

/* Gr_Text() */
/*
 * arg [0] = x
 * arg [1] = y
 * arg [2] = alignment
 * arg [3] = strlen (text)
 */
static void
Gr_Text(grwin_t * grwin, grcmd_t * data)
{
  int x, y, align;

  if (data->ncoords < 4 || data->text == NULL || *(data->text) == '\0')
    return;

  x = data->coords[0] * grwin->w / GRX_SCALE;
  y = data->coords[1] * grwin->h / GRX_SCALE;
  align = data->coords[2];

  if (align & RIGHT_TEXT)
    x -= XTextWidth(TermWin.font, data->text, data->coords[3]);
  else if (align & HCENTER_TEXT)
    x -= (XTextWidth(TermWin.font, data->text, data->coords[3]) >> 1);

  if (align & TOP_TEXT)
    y += TermWin.font->ascent;
  else if (align & BOTTOM_TEXT)
    y -= TermWin.font->descent;

  if (align & VCENTER_TEXT)
    y -= TermWin.font->descent + ((TermWin.font->ascent + TermWin.font->descent) >> 1);
  if (align & VCAPS_CENTER_TEXT)
    y += (TermWin.font->ascent >> 1);

# ifdef PIXMAP_SUPPORT
  XClearArea(Xdisplay, grwin->win,
	     x, y,
	     Width2Pixel(data->coords[3]),
	     Height2Pixel(1),
	     0);
# endif
  XDrawString(Xdisplay, grwin->win, TermWin.gc,
	      x, y,
	      data->text, data->coords[3]);
}

/* Gr_Geometry() */
static void
Gr_Geometry(grwin_t * grwin, grcmd_t * data)
{
  if (grwin)
    tt_printf("\033G%ld %d %d %u %u %d %d %ld %ld %d\n",
	      (long) grwin->win,
	      grwin->x, grwin->y, grwin->w, grwin->h,
	      TermWin.fwidth,
	      TermWin.fheight,
	      (long) GRX_SCALE * TermWin.fwidth / grwin->w,
	      (long) GRX_SCALE * TermWin.fheight / grwin->h,
	      Xdepth);
  else				/* rxvt terminal window size */
    tt_printf("\033G0 0 0 %d %d %d %d %ld %ld %d\n",
	      TermWin.width - 2 * TermWin.internalBorder,
	      TermWin.height - 2 * TermWin.internalBorder,
	      TermWin.fwidth,
	      TermWin.fheight,
	      (long) GRX_SCALE * TermWin.fwidth / (TermWin.width - 2 * TermWin.internalBorder),
	      (long) GRX_SCALE * TermWin.fheight / (TermWin.height - 2 * TermWin.internalBorder),
	      Xdepth);
}

/* Gr_DestroyWindow() */
static void
Gr_DestroyWindow(grwin_t * grwin)
{
  grcmd_t *cmd, *next;

  if (grwin == NULL)
    return;

  for (cmd = grwin->graphics; cmd; cmd = next) {
    next = cmd->next;
    free(cmd->coords);
    if (cmd->text != NULL)
      free(cmd->text);
    free(cmd);
  }

  XDestroyWindow(Xdisplay, grwin->win);
  if (grwin->next != NULL)
    grwin->next->prev = grwin->prev;
  if (grwin->prev != NULL)
    grwin->prev->next = grwin->next;
  else
    gr_root = grwin->next;
  free(grwin);

  graphics_up--;
}

/* Gr_Dispatch() */
static void
Gr_Dispatch(grwin_t * grwin, grcmd_t * data)
{
  int i, n;
  union {
    XPoint pt[NGRX_PTS / 2];
    XRectangle rect[NGRX_PTS / 4];
  } xdata;

  if (data->color != fgColor) {
    XGCValues gcv;

    gcv.foreground = PixColors[data->color];
    XChangeGC(Xdisplay, TermWin.gc, GCForeground, &gcv);
  }
  if (grwin)
    switch (data->cmd) {
      case 'L':
	if (data->ncoords > 3) {
	  for (n = i = 0; i < data->ncoords; i += 2, n++) {
	    xdata.pt[n].x = data->coords[i] * grwin->w / GRX_SCALE;
	    xdata.pt[n].y = data->coords[i + 1] * grwin->h / GRX_SCALE;
	  }
	  XDrawLines(Xdisplay,
		     grwin->win, TermWin.gc, xdata.pt, n, CoordModeOrigin);
	}
	break;

      case 'P':
	if (data->ncoords > 3) {
	  for (n = i = 0; i < data->ncoords; i += 2, n++) {
	    xdata.pt[n].x = data->coords[i] * grwin->w / GRX_SCALE;
	    xdata.pt[n].y = data->coords[i + 1] * grwin->h / GRX_SCALE;
	  }
	  XDrawPoints(Xdisplay,
		      grwin->win, TermWin.gc, xdata.pt, n, CoordModeOrigin);
	}
	break;

      case 'F':
	if (data->ncoords > 0) {
	  for (n = i = 0; i < data->ncoords; i += 4, n++) {
	    xdata.rect[n].x = data->coords[i] * grwin->w / GRX_SCALE;
	    xdata.rect[n].y = data->coords[i + 1] * grwin->h / GRX_SCALE;
	    xdata.rect[n].width = ((data->coords[i + 2]
				    - data->coords[i] + 1) *
				   grwin->w / GRX_SCALE);
	    xdata.rect[n].height = ((data->coords[i + 3]
				     - data->coords[i + 1] + 1) *
				    grwin->h / GRX_SCALE);

# ifdef PIXMAP_SUPPORT
	    XClearArea(Xdisplay, grwin->win,
		       xdata.rect[n].x,
		       xdata.rect[n].y,
		       xdata.rect[n].width,
		       xdata.rect[n].height,
		       0);
# endif
	  }
	  XFillRectangles(Xdisplay, grwin->win, TermWin.gc, xdata.rect, n);
	}
	break;
      case 'T':
	Gr_Text(grwin, data);
	break;
      case 'C':
	Gr_ClearWindow(grwin);
	break;
    }
  if (data->color != fgColor) {
    XGCValues gcv;

    gcv.foreground = PixColors[fgColor];
    XChangeGC(Xdisplay, TermWin.gc, GCForeground, &gcv);
  }
}

/* Gr_Redraw() */
static void
Gr_Redraw(grwin_t * grwin)
{
  grcmd_t *cmd;

  for (cmd = grwin->graphics; cmd != NULL; cmd = cmd->next)
    Gr_Dispatch(grwin, cmd);
}

#endif
/*----------------------------------------------------------------------*
 * end of static functions
 */

#ifdef RXVT_GRAPHICS
void
Gr_ButtonReport(int but, int x, int y)
{
  grwin_t *grwin;

  for (grwin = gr_root; grwin != NULL; grwin = grwin->next)
    if ((x > grwin->x) &&
	(y > grwin->y) &&
	(x < grwin->x + grwin->w) &&
	(y < grwin->y + grwin->h))
      break;

  if (grwin == NULL)
    return;

  x = GRX_SCALE * (x - grwin->x) / grwin->w;
  y = GRX_SCALE * (y - grwin->y) / grwin->h;
  tt_printf("\033%c%ld;%d;%d;\n", but, (long) grwin->win, x, y);
}

/* Gr_do_graphics() */
void
Gr_do_graphics(int cmd, int nargs, int args[], unsigned char *text)
{
  static Window last_id = None;
  long win_id;
  grwin_t *grwin;
  grcmd_t *newcmd, *oldcmd;
  int i;

  if (cmd == 'W') {
    Gr_NewWindow(nargs, args);
    return;
  }
  win_id = (nargs > 0) ? (Window) args[0] : None;

  if ((cmd == 'G') && (win_id == None)) {
    Gr_Geometry(NULL, NULL);
    return;
  }
  if ((win_id == None) && (last_id != None))
    win_id = last_id;

  if (win_id == None)
    return;

  grwin = gr_root;
  while ((grwin != NULL) && (grwin->win != win_id))
    grwin = grwin->next;

  if (grwin == NULL)
    return;

  if (cmd == 'G') {
    Gr_Geometry(grwin, NULL);
    return;
  }
  nargs--;
  args++;			/* skip over window id */

  /* record this new command */
  newcmd = (grcmd_t *) MALLOC(sizeof(grcmd_t));
  newcmd->ncoords = nargs;
  newcmd->coords = (int *) MALLOC((newcmd->ncoords * sizeof(int)));

  newcmd->next = NULL;
  newcmd->cmd = cmd;
  newcmd->color = scr_get_fgcolor();
  newcmd->text = text;

  for (i = 0; i < newcmd->ncoords; i++)
    newcmd->coords[i] = args[i];

  /*
   * If newcmd == fill, and rectangle is full window, drop all prior
   * commands.
   */
  if ((newcmd->cmd == 'F') && (grwin) && (grwin->graphics)) {
    for (i = 0; i < newcmd->ncoords; i += 4) {
      if ((newcmd->coords[i] == 0) &&
	  (newcmd->coords[i + 1] == 0) &&
	  (newcmd->coords[i + 2] == GRX_SCALE) &&
	  (newcmd->coords[i + 3] == GRX_SCALE)) {
	/* drop previous commands */
	oldcmd = grwin->graphics;
	while (oldcmd->next != NULL) {
	  grcmd_t *tmp = oldcmd;

	  oldcmd = oldcmd->next;
	  free(tmp);
	}
	grwin->graphics = NULL;
      }
    }
  }
  /* insert new command into command list */
  oldcmd = grwin->graphics;
  if (oldcmd == NULL)
    grwin->graphics = newcmd;
  else {
    while (oldcmd->next != NULL)
      oldcmd = oldcmd->next;
    oldcmd->next = newcmd;
  }
  Gr_Dispatch(grwin, newcmd);
}

/* Gr_scroll() */
void
Gr_scroll(int count)
{
  static short prev_start = 0;
  grwin_t *grwin, *next;

  if ((count == 0) && (prev_start == TermWin.view_start))
    return;

  prev_start = TermWin.view_start;

  for (grwin = gr_root; grwin != NULL; grwin = next) {
    next = grwin->next;
    grwin->y -= (count * TermWin.fheight);
    if ((grwin->y + grwin->h) < -(TermWin.saveLines * TermWin.fheight))
      Gr_DestroyWindow(grwin);
    else
      XMoveWindow(Xdisplay, grwin->win,
		  grwin->x,
		  grwin->y + (TermWin.view_start * TermWin.fheight));
  }
}

/* Gr_ClearScreen() */
void
Gr_ClearScreen(void)
{
  grwin_t *grwin, *next;

  for (grwin = gr_root; grwin != NULL; grwin = next) {
    next = grwin->next;
    if ((grwin->screen == 0) && (grwin->y + grwin->h > 0)) {
      if (grwin->y >= 0)
	Gr_DestroyWindow(grwin);
      else
	XResizeWindow(Xdisplay, grwin->win,
		      grwin->w, -grwin->y);
    }
  }
}

/* Gr_ChangeScreen() */
void
Gr_ChangeScreen(void)
{
  grwin_t *grwin, *next;

  for (grwin = gr_root; grwin != NULL; grwin = next) {
    next = grwin->next;
    if (grwin->y + grwin->h > 0) {
      if (grwin->screen == 1) {
	XMapWindow(Xdisplay, grwin->win);
	grwin->screen = 0;
      } else {
	XUnmapWindow(Xdisplay, grwin->win);
	grwin->screen = 1;
      }
    }
  }
}

/* Gr_expose() */
void
Gr_expose(Window win)
{
  grwin_t *grwin;

  for (grwin = gr_root; grwin != NULL; grwin = grwin->next) {
    if (grwin->win == win) {
      Gr_Redraw(grwin);
      break;
    }
  }
}

/* Gr_Resize() */
void
Gr_Resize(int w, int h)
{
  grwin_t *grwin;

  for (grwin = gr_root; grwin != NULL; grwin = grwin->next) {
    if (TermWin.height != h) {
      grwin->y += (TermWin.height - h);
      XMoveWindow(Xdisplay, grwin->win,
		  grwin->x,
		  grwin->y + (TermWin.view_start * TermWin.fheight));
    }
    Gr_Redraw(grwin);
  }
}

/* Gr_reset() */
void
Gr_reset(void)
{
  grwin_t *grwin, *next;

  for (grwin = gr_root; grwin != NULL; grwin = next) {
    next = grwin->next;
    Gr_DestroyWindow(grwin);
  }

  graphics_up = 0;
}

/* Gr_Displayed() */
int
Gr_Displayed(void)
{
  return graphics_up;
}

#endif /* RXVT_GRAPHICS */
/*----------------------- end-of-file (C source) -----------------------*/