Move "frame" to new module

1 files changed, 84 insertions, 0 deletions

diff --git a/src/frame.c b/src/frame.c
new file mode 100644
index 0000000..637fff1
--- /dev/null
+++ b/src/frame.c
@@ -0,0 +1,84 @@
+/*
+ * 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;
+}
+