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/* Copyright (c) 1993
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Copyright (c) 1987 Oliver Laumann
*
* This program 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.
*
* This program 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 (see the file COPYING); if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
****************************************************************
* $Id: overlay.h,v 1.3 1994/05/31 12:32:31 mlschroe Exp $ FAU
*/
/*
* This is the overlay structure. It is used to create a seperate
* layer over the current windows.
*/
struct mchar; /* forward declaration */
struct LayFuncs
{
void (*LayProcess) __P((char **, int *));
void (*LayAbort) __P((void));
void (*LayRedisplayLine) __P((int, int, int, int));
void (*LayClearLine) __P((int, int, int));
int (*LayRewrite) __P((int, int, int, struct mchar *, int));
int (*LayResize) __P((int, int));
void (*LayRestore) __P((void));
};
struct layer
{
struct canvas *l_cvlist; /* list of canvases displaying layer */
int l_width;
int l_height;
int l_x; /* cursor position */
int l_y;
struct LayFuncs *l_layfn;
char *l_data;
struct layer *l_next; /* layer stack, should be in data? */
struct layer *l_bottom; /* bottom element of layer stack */
int l_blocking;
};
#define Process (*flayer->l_layfn->LayProcess)
#define Abort (*flayer->l_layfn->LayAbort)
#define RedisplayLine (*flayer->l_layfn->LayRedisplayLine)
#define ClearLine (*flayer->l_layfn->LayClearLine)
#define Rewrite (*flayer->l_layfn->LayRewrite)
#define Resize (*flayer->l_layfn->LayResize)
#define Restore (*flayer->l_layfn->LayRestore)
#define SetCursor() LGotoPos(flayer, flayer->l_x, flayer->l_y)
#define CanResize(l) (l->l_layfn->LayResize != DefResize)
/* XXX: AArgh! think again! */
#define LAY_CALL_UP(fn) do \
{ \
struct layer *oldlay = flayer; \
struct canvas *oldcvlist, *cv; \
debug("LayCallUp\n"); \
flayer = flayer->l_next; \
oldcvlist = flayer->l_cvlist; \
debug1("oldcvlist: %x\n", oldcvlist); \
flayer->l_cvlist = oldlay->l_cvlist; \
for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext) \
cv->c_layer = flayer; \
fn; \
flayer = oldlay; \
for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext) \
cv->c_layer = flayer; \
flayer->l_next->l_cvlist = oldcvlist; \
} while(0)
#define LAY_DISPLAYS(l, fn) do \
{ \
struct display *olddisplay = display; \
struct canvas *cv; \
for (display = displays; display; display = display->d_next) \
{ \
for (cv = D_cvlist; cv; cv = cv->c_next) \
if (cv->c_layer == l) \
break; \
if (cv == 0) \
continue; \
fn; \
} \
display = olddisplay; \
} while(0)
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