From 9c03e52fcbe65f27955dd3e021b2469f1a15f58c Mon Sep 17 00:00:00 2001
From: Robin Watts <robin.watts@artifex.com>
Date: Sun, 2 Jun 2013 16:49:38 +0100
Subject: Improve rendering of fts_15_1506.pdf

Negative xstep or ysteps cause problems.
---
 pdf/pdf_interpret.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'pdf')

diff --git a/pdf/pdf_interpret.c b/pdf/pdf_interpret.c
index 13d6751e..44a12ce8 100644
--- a/pdf/pdf_interpret.c
+++ b/pdf/pdf_interpret.c
@@ -1410,6 +1410,14 @@ pdf_show_pattern(pdf_csi *csi, pdf_pattern *pat, pdf_gstate *pat_gstate, const f
 		fy0 = (local_area.y0 - pat->bbox.y0) / pat->ystep;
 		fx1 = (local_area.x1 - pat->bbox.x0) / pat->xstep;
 		fy1 = (local_area.y1 - pat->bbox.y0) / pat->ystep;
+		if (fx0 > fx1)
+		{
+			float t = fx0; fx0 = fx1; fx1 = t;
+		}
+		if (fy0 > fy1)
+		{
+			float t = fy0; fy0 = fy1; fy1 = t;
+		}
 
 		oldtop = csi->gtop;
 
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