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/*
* frame.c
*
* Colloquium - A tiny presentation program
*
* Copyright (c) 2012 Thomas White <taw@bitwiz.org.uk>
*
* 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include "frame.h"
static int alloc_ro(struct frame *fr)
{
struct frame **new_ro;
new_ro = realloc(fr->rendering_order,
fr->max_ro*sizeof(struct frame *));
if ( new_ro == NULL ) return 1;
fr->rendering_order = new_ro;
return 0;
}
struct frame *frame_new()
{
struct frame *n;
n = calloc(1, sizeof(struct frame));
if ( n == NULL ) return NULL;
n->rendering_order = NULL;
n->max_ro = 32;
alloc_ro(n);
n->num_ro = 1;
n->rendering_order[0] = n;
n->pl = NULL;
return n;
}
struct frame *add_subframe(struct frame *fr)
{
struct frame *n;
n = frame_new();
if ( n == NULL ) return NULL;
if ( fr->num_ro == fr->max_ro ) {
fr->max_ro += 32;
if ( alloc_ro(fr) ) return NULL;
}
fr->rendering_order[fr->num_ro++] = n;
return n;
}
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