From 32468516e31ee16f6d63923aeb2af8714dfe1a1a Mon Sep 17 00:00:00 2001
From: John-Mark Bell <jmb@netsurf-browser.org>
Date: Sun, 5 Jan 2014 14:34:04 +0000
Subject: Speculatively start image fetches as we parse the document.

---
 desktop/save_complete.c |  2 +-
 render/html.c           | 35 +++++++++++++++++++++++++++++++++++
 render/html_object.c    | 26 +++++++++++++++++---------
 3 files changed, 53 insertions(+), 10 deletions(-)

diff --git a/desktop/save_complete.c b/desktop/save_complete.c
index 0c67654a6..efe223747 100644
--- a/desktop/save_complete.c
+++ b/desktop/save_complete.c
@@ -435,7 +435,7 @@ static bool save_complete_save_html_objects(save_complete_ctx *ctx,
 	object = html_get_objects(c, &count);
 
 	for (; object != NULL; object = object->next) {
-		if (object->content != NULL) {
+		if (object->content != NULL || object->box != NULL) {
 			if (save_complete_save_html_object(ctx,
 					object->content) == false)
 				return false;
diff --git a/render/html.c b/render/html.c
index 49bb019dd..04b2fda18 100644
--- a/render/html.c
+++ b/render/html.c
@@ -507,6 +507,37 @@ static nserror html_meta_refresh_process_element(html_content *c, dom_node *n)
 	return error;
 }
 
+static bool html_process_img(html_content *c, dom_node *node)
+{
+	dom_string *src;
+	nsurl *url;
+	nserror err;
+	dom_exception exc;
+	bool success;
+
+	/* Do nothing if foreground images are disabled */
+	if (nsoption_bool(foreground_images) == false) {
+		return true;
+	}
+
+	exc = dom_element_get_attribute(node, corestring_dom_src, &src);
+	if (exc != DOM_NO_ERR || src == NULL) {
+		return true;
+	}
+
+	err = nsurl_join(c->base_url, dom_string_data(src), &url);
+	if (err != NSERROR_OK) {
+		dom_string_unref(src);
+		return false;
+	}
+	dom_string_unref(src);
+
+	/* Speculatively fetch the image */
+	success = html_fetch_object(c, url, NULL, CONTENT_IMAGE, 0, 0, false);
+	nsurl_unref(url);
+
+	return success;
+}
 
 /**
  * Complete conversion of an HTML document
@@ -608,6 +639,10 @@ dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
 						name, corestring_lwc_title) &&
 						htmlc->title == NULL) {
 					htmlc->title = dom_node_ref(node);
+				} else if (dom_string_caseless_lwc_isequal(
+						name, corestring_lwc_img)) {
+					html_process_img(htmlc,
+							(dom_node *) node);
 				}
 
 				dom_string_unref(name);
diff --git a/render/html_object.c b/render/html_object.c
index f4975e9ba..6cd08c1ef 100644
--- a/render/html_object.c
+++ b/render/html_object.c
@@ -123,6 +123,9 @@ html_object_callback(hlcache_handle *object,
 	assert(c->base.status != CONTENT_STATUS_ERROR);
 
 	box = o->box;
+	if (box == NULL && event->type != CONTENT_MSG_ERROR) {
+		return NSERROR_OK;
+	}
 
 	switch (event->type) {
 	case CONTENT_MSG_LOADING:
@@ -181,11 +184,13 @@ html_object_callback(hlcache_handle *object,
 
 		o->content = NULL;
 
-		c->base.active--;
-		LOG(("%d fetches active", c->base.active));
+		if (box != NULL) {
+			c->base.active--;
+			LOG(("%d fetches active", c->base.active));
 
-		content_add_error(&c->base, "?", 0);
-		html_object_failed(box, c, o->background);
+			content_add_error(&c->base, "?", 0);
+			html_object_failed(box, c, o->background);
+		}
 		break;
 
 	case CONTENT_MSG_STATUS:
@@ -464,7 +469,7 @@ html_object_callback(hlcache_handle *object,
 	 * then reformat the page to display newly fetched objects */
 	else if (nsoption_bool(incremental_reflow) &&
 			event->type == CONTENT_MSG_DONE &&
-			!(box->flags & REPLACE_DIM) &&
+			box != NULL && !(box->flags & REPLACE_DIM) &&
 			(c->base.status == CONTENT_STATUS_READY ||
 			 c->base.status == CONTENT_STATUS_DONE) &&
 			(wallclock() > c->base.reformat_time)) {
@@ -491,6 +496,7 @@ static bool html_replace_object(struct content_html_object *object, nsurl *url)
 	nserror error;
 
 	assert(object != NULL);
+	assert(object->box != NULL);
 
 	c = (html_content *) object->parent;
 
@@ -562,7 +568,7 @@ nserror html_object_open_objects(html_content *html, struct browser_window *bw)
 	for (object = html->object_list; object != NULL; object = next) {
 		next = object->next;
 
-		if (object->content == NULL)
+		if (object->content == NULL || object->box == NULL)
 			continue;
 
 		if (content_get_type(object->content) == CONTENT_NONE)
@@ -621,7 +627,7 @@ nserror html_object_close_objects(html_content *html)
 	for (object = html->object_list; object != NULL; object = next) {
 		next = object->next;
 
-		if (object->content == NULL)
+		if (object->content == NULL || object->box == NULL)
 			continue;
 
 		if (content_get_type(object->content) == CONTENT_NONE)
@@ -701,8 +707,10 @@ bool html_fetch_object(html_content *c, nsurl *url, struct box *box,
 	c->object_list = object;
 
 	c->num_objects++;
-	c->base.active++;
-	LOG(("%d fetches active", c->base.active));
+	if (box != NULL) {
+		c->base.active++;
+		LOG(("%d fetches active", c->base.active));
+	}
 
 	return true;
 }
-- 
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