From d117eb452763e1da14c89b9a5379285b56d6ad78 Mon Sep 17 00:00:00 2001
From: James Bursa <james@netsurf-browser.org>
Date: Sun, 31 Dec 2006 23:47:17 +0000
Subject: Stop animated images rendering for hidden or fallback boxes.

svn path=/trunk/netsurf/; revision=3128
---
 render/box.c  | 28 ++++++++++++++++++++++++++++
 render/box.h  |  1 +
 render/html.c |  4 +++-
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/render/box.c b/render/box.c
index fe70c61f8..6f5b3f158 100644
--- a/render/box.c
+++ b/render/box.c
@@ -458,6 +458,34 @@ struct box *box_find_by_id(struct box *box, const char *id)
 }
 
 
+/**
+ * Determine if a box is visible when the tree is rendered.
+ *
+ * \param  box  box to check
+ * \return  true iff the box is rendered
+ */
+
+bool *box_visible(struct box *box)
+{
+	struct box *fallback;
+
+	/* visibility: hidden */
+	if (box->style && box->style->visibility == CSS_VISIBILITY_HIDDEN)
+		return false;
+
+	/* check if a fallback */
+	while (box->parent) {
+		for (fallback = box->parent->fallback; fallback;
+				fallback = fallback->next)
+			if (fallback == box)
+				return false;
+		box = box->parent;
+	}
+
+	return true;
+}
+
+
 /**
  * Print a box tree to stderr.
  */
diff --git a/render/box.h b/render/box.h
index e932b7480..bdc2fdbdc 100644
--- a/render/box.h
+++ b/render/box.h
@@ -276,6 +276,7 @@ struct box *box_at_point(struct box *box, int x, int y,
 		struct content **content);
 struct box *box_object_at_point(struct content *c, int x, int y);
 struct box *box_find_by_id(struct box *box, const char *id);
+bool *box_visible(struct box *box);
 void box_dump(struct box *box, unsigned int depth);
 bool box_extract_link(const char *rel, const char *base, char **result);
 
diff --git a/render/html.c b/render/html.c
index ddf097cb3..1e50a77fb 100644
--- a/render/html.c
+++ b/render/html.c
@@ -503,7 +503,7 @@ bool html_head(struct content *c, xmlNode *head)
 	for (node = head->children; node != 0; node = node->next) {
 		if (node->type != XML_ELEMENT_NODE)
 			continue;
-			
+
 		LOG(("Node: %s", node->name));
 		if (!c->title && strcmp(node->name, "title") == 0) {
 			xmlChar *title = xmlNodeGetContent(node);
@@ -1141,6 +1141,8 @@ void html_object_callback(content_msg msg, struct content *object,
 			break;
 
 		case CONTENT_MSG_REDRAW:
+			if (!box_visible(box))
+				break;
 			box_coords(box, &x, &y);
 			if (object == data.redraw.object) {
 				data.redraw.x = data.redraw.x *
-- 
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