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cursors.c

/* cursor.c -- Cursor handling
   $Id: cursors.c,v 1.19 2002/11/03 21:00:36 jsh Exp $

   Copyright (C) 1999 John Harper <john@dcs.warwick.ac.uk>

   This file is part of sawmill.

   sawmill 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.

   sawmill 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 sawmill; see the file COPYING.   If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "sawmill.h"
#include <X11/cursorfont.h>

static Lisp_Cursor *cursor_list;
int cursor_type;

repv default_cursor;
DEFSYM(cursor_shape, "cursor-shape");


/* Cursors from bitmaps */

static Cursor
make_bm_cursor (repv image, repv mask, repv fg, repv bg)
{
    rep_GC_root gc_image, gc_mask, gc_fg, gc_bg;
    int width, height, x_hot, y_hot;
    Pixmap bm_image, bm_mask;
    Cursor cursor = 0;

    if (rep_STRINGP(fg))
      fg = Fget_color (fg, Qnil);
    if (rep_STRINGP(bg))
      bg = Fget_color (bg, Qnil);

    if (!rep_STRINGP(image) || !rep_STRINGP(mask)
      || !COLORP(fg) || !COLORP(bg))
    {
      return 0;
    }

    rep_PUSHGC(gc_image, image);
    rep_PUSHGC(gc_mask, mask);
    rep_PUSHGC(gc_fg, fg);
    rep_PUSHGC(gc_bg, bg);

    bm_mask = make_bitmap (mask, &width, &height, &x_hot, &y_hot);
    if (bm_mask != 0)
    {
      bm_image = make_bitmap (image, &width, &height, &x_hot, &y_hot);
      if (bm_image != 0)
      {
          XColor xc_fg, xc_bg;
          xc_fg.red = VCOLOR(fg)->red;
          xc_fg.green = VCOLOR(fg)->green;
          xc_fg.blue = VCOLOR(fg)->blue;
          xc_fg.pixel = VCOLOR(fg)->pixel;
          xc_bg.red = VCOLOR(bg)->red;
          xc_bg.green = VCOLOR(bg)->green;
          xc_bg.blue = VCOLOR(bg)->blue;
          xc_bg.pixel = VCOLOR(bg)->pixel;
          cursor = XCreatePixmapCursor (dpy, bm_image, bm_mask,
                                &xc_fg, &xc_bg, x_hot, y_hot);
          XFreePixmap (dpy, bm_image);
      }
      XFreePixmap (dpy, bm_mask);
    }
    rep_POPGC; rep_POPGC; rep_POPGC; rep_POPGC;
    return cursor;
}



DEFUN("get-cursor", Fget_cursor, Sget_cursor, (repv data), rep_Subr1) /*
::doc:sawfish.wm.cursors#get-cursor::
get-cursor DATA

Returns the cursor object representing the cursor defined by DATA.
If DATA is a symbol, it's replaced by its `cursor-shape' property.

Possible DATA values are an integer representing a glyph in the standard
X11 cursor font, or an image object.
::end:: */
{
    Lisp_Cursor *f;

    if (dpy == 0)
      return Qnil;

    if (rep_SYMBOLP(data))
      data = Fget (data, Qcursor_shape);

    f = cursor_list;
    while (f != 0 && f->data != data)
      f = f->next;
    if (f == 0)
    {
      Cursor cursor = 0;
      if (rep_INTP(data))
          cursor = XCreateFontCursor (dpy, rep_INT(data));
      else if (IMAGEP(data))
      {
          /* XXX implement cursors from images..? */
      }
      else if (rep_VECTORP(data) && rep_VECT_LEN (data) >= 4)
      {
          cursor = make_bm_cursor (rep_VECTI(data, 0), rep_VECTI(data, 1),
                             rep_VECTI(data, 2), rep_VECTI(data, 3));
      }
      if (cursor != 0)
      {
          f = rep_ALLOC_CELL(sizeof(Lisp_Cursor));
          rep_data_after_gc += sizeof (Lisp_Cursor);
          f->car = cursor_type;
          f->next = cursor_list;
          cursor_list = f;
          f->data = data;
          f->cursor = cursor;
      }
      else
      {
          return Fsignal (Qerror,
                      rep_list_2 (rep_string_dup("no such cursor"),
                              data));
      }
    }
    return rep_VAL(f);
}

DEFUN("recolor-cursor", Frecolor_cursor, Srecolor_cursor,
      (repv cursor, repv fg, repv bg), rep_Subr3) /*
::doc:sawfish.wm.cursors#recolor-cursor::
recolor-cursor CURSOR FG BG
::end:: */
{
    XColor xc_fg, xc_bg;
    rep_DECLARE1(cursor, CURSORP);
    if (rep_STRINGP(fg))
      fg = Fget_color (fg, Qnil);
    rep_DECLARE(2, fg, fg && COLORP(fg));
    if (rep_STRINGP(bg))
      bg = Fget_color (bg, Qnil);
    rep_DECLARE(3, bg, bg && COLORP(bg));
    xc_fg.red = VCOLOR(fg)->red;
    xc_fg.green = VCOLOR(fg)->green;
    xc_fg.blue = VCOLOR(fg)->blue;
    xc_fg.pixel = VCOLOR(fg)->pixel;
    xc_bg.red = VCOLOR(bg)->red;
    xc_bg.green = VCOLOR(bg)->green;
    xc_bg.blue = VCOLOR(bg)->blue;
    xc_bg.pixel = VCOLOR(bg)->pixel;
    XRecolorCursor (dpy, VCURSOR(cursor)->cursor, &xc_fg, &xc_bg);
    return cursor;
}

DEFUN("default-cursor", Fdefault_cursor, Sdefault_cursor, (repv arg), rep_Subr1) /*
::doc:sawfish.wm.cursors#default-cursor::
default-cursor [NEW-VALUE]

The cursor object displayed in the root window, and in frame parts which
have no other cursor specified.
::end:: */
{
    if (CURSORP(arg))
    {
      default_cursor = arg;
      XDefineCursor (dpy, root_window, VCURSOR(default_cursor)->cursor);
    }
    return default_cursor;
}

DEFUN("cursorp", Fcursorp, Scursorp, (repv arg), rep_Subr1) /*
::doc:sawfish.wm.cursors#cursorp::
cursor ARG

Returns t if ARG is an cursor object.
::end:: */
{
    return CURSORP(arg) ? Qt : Qnil;
}


/* type hooks */

static int
cursor_cmp (repv w1, repv w2)
{
    return w1 != w2;
}

static void
cursor_prin (repv stream, repv obj)
{
    char buf[256];
    sprintf (buf, "#<cursor %x>", (u_int) VCURSOR(obj)->cursor);
    rep_stream_puts (stream, buf, -1, FALSE);
}

static void
cursor_mark (repv obj)
{
    rep_MARKVAL(VCURSOR(obj)->data);
}

static void
cursor_sweep (void)
{
    Lisp_Cursor *w = cursor_list;
    cursor_list = 0;
    while (w != 0)
    {
      Lisp_Cursor *next = w->next;
      if (!rep_GC_CELL_MARKEDP(rep_VAL(w)))
      {
          XFreeCursor (dpy, w->cursor);
          rep_FREE_CELL(w);
      }
      else
      {
          rep_GC_CLR_CELL(rep_VAL(w));
          w->next = cursor_list;
          cursor_list = w;
      }
      w = next;
    }
}


/* initialisation */

void
cursors_init (void)
{
    repv tem = rep_push_structure ("sawfish.wm.cursors");
    cursor_type = rep_register_new_type ("cursor", cursor_cmp, cursor_prin,
                               cursor_prin, cursor_sweep,
                               cursor_mark, 0, 0, 0, 0, 0, 0, 0);
    rep_ADD_SUBR(Sget_cursor);
    rep_ADD_SUBR(Srecolor_cursor);
    rep_ADD_SUBR(Sdefault_cursor);
    rep_ADD_SUBR(Scursorp);
    if (!batch_mode_p ())
      Fdefault_cursor (Fget_cursor (rep_MAKE_INT (XC_left_ptr)));
    else
      default_cursor = Qnil;
    rep_mark_static (&default_cursor);
    rep_INTERN(cursor_shape);
    rep_pop_structure (tem);
}

void
cursors_kill (void)
{
}

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