From 0dbfc980afc9d318a1fcb68994621006240ce205 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 7 Apr 2011 23:41:40 +0200
Subject: Fix bug with gsave/grestore nesting when running tiled patterns.

---
 fitz/dev_list.c | 22 +++++++++++++---------
 pdf/pdf_build.c |  2 ++
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/fitz/dev_list.c b/fitz/dev_list.c
index 0cc5e992..71d938d0 100644
--- a/fitz/dev_list.c
+++ b/fitz/dev_list.c
@@ -375,6 +375,7 @@ void
 fz_execute_display_list(fz_display_list *list, fz_device *dev, fz_matrix top_ctm, fz_bbox bounds)
 {
 	fz_display_node *node;
+	fz_matrix ctm;
 	fz_rect bbox;
 	int clipped = 0;
 	int tiled = 0;
@@ -389,24 +390,25 @@ fz_execute_display_list(fz_display_list *list, fz_device *dev, fz_matrix top_ctm
 
 	for (node = list->first; node; node = node->next)
 	{
-		fz_matrix ctm = fz_concat(node->ctm, top_ctm);
-		fz_rect rect = fz_transform_rect(top_ctm, node->rect);
+		fz_bbox rect = fz_round_rect(fz_transform_rect(top_ctm, node->rect));
 
 		/* never skip tiles */
+		if (node->cmd == FZ_CMD_BEGIN_TILE) {
+			tiled++;
+			goto visible;
+		}
+		if (node->cmd == FZ_CMD_END_TILE) {
+			tiled--;
+			goto visible;
+		}
 		if (tiled)
 			goto visible;
 
 		/* cull objects to draw using a quick visibility test */
-		if (clipped || fz_is_empty_bbox(fz_intersect_bbox(fz_round_rect(rect), bounds)))
+		if (clipped || fz_is_empty_bbox(fz_intersect_bbox(rect, bounds)))
 		{
 			switch (node->cmd)
 			{
-			case FZ_CMD_BEGIN_TILE:
-				tiled++;
-				goto visible;
-			case FZ_CMD_END_TILE:
-				tiled--;
-				goto visible;
 			case FZ_CMD_CLIP_PATH:
 			case FZ_CMD_CLIP_STROKE_PATH:
 			case FZ_CMD_CLIP_TEXT:
@@ -432,6 +434,8 @@ fz_execute_display_list(fz_display_list *list, fz_device *dev, fz_matrix top_ctm
 		}
 
 visible:
+		ctm = fz_concat(node->ctm, top_ctm);
+
 		switch (node->cmd)
 		{
 		case FZ_CMD_FILL_PATH:
diff --git a/pdf/pdf_build.c b/pdf/pdf_build.c
index 7218e135..8c043107 100644
--- a/pdf/pdf_build.c
+++ b/pdf/pdf_build.c
@@ -214,9 +214,11 @@ pdf_show_pattern(pdf_csi *csi, pdf_pattern *pat, fz_rect area, int what)
 		fz_begin_tile(csi->dev, area, pat->bbox, pat->xstep, pat->ystep, ptm);
 		gstate->ctm = ptm;
 		csi->top_ctm = gstate->ctm;
+		pdf_gsave(csi);
 		error = pdf_run_csi_buffer(csi, pat->resources, pat->contents);
 		if (error)
 			fz_catch(error, "cannot render pattern tile");
+		pdf_grestore(csi);
 		while (oldtop < csi->gtop)
 			pdf_grestore(csi);
 		fz_end_tile(csi->dev);
-- 
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