From 58de1fff510078e3d2d8cfce033c87299adf78f0 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ghostscript.com>
Date: Thu, 11 Nov 2004 07:15:07 +0100
Subject: filter reference counting

---
 filter/filter.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

(limited to 'filter/filter.c')

diff --git a/filter/filter.c b/filter/filter.c
index 25bbd441..4bd8c4ff 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -1,8 +1,8 @@
 #include <fitz.h>
 
-fz_error fz_kioneedin = { "<ioneedin>", "<process>", "filter.c", 0, 1 };
-fz_error fz_kioneedout = { "<ioneedout>", "<process>", "filter.c", 0, 1 };
-fz_error fz_kiodone = { "<iodone>", "<process>", "filter.c", 0, 1 };
+fz_error fz_kioneedin = { -1, "<ioneedin>", "<process>", "filter.c", 0 };
+fz_error fz_kioneedout = { -1, "<ioneedout>", "<process>", "filter.c", 0 };
+fz_error fz_kiodone = { -1, "<iodone>", "<process>", "filter.c", 0 };
 
 fz_error *
 fz_process(fz_filter *f, fz_buffer *in, fz_buffer *out)
@@ -31,11 +31,21 @@ fz_process(fz_filter *f, fz_buffer *in, fz_buffer *out)
 	return reason;
 }
 
+fz_filter *
+fz_keepfilter(fz_filter *f)
+{
+	f->nrefs ++;
+	return f;
+}
+
 void
 fz_dropfilter(fz_filter *f)
 {
-	if (f->drop)
-		f->drop(f);
-	fz_free(f);
+	if (--f->nrefs == 0)
+	{
+		if (f->drop)
+			f->drop(f);
+		fz_free(f);
+	}
 }
 
-- 
cgit v1.2.3