X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=b80d0578b7bd219d8397a2532b23f1b4491e608d;hb=aae96e5998971764de34a5e1755a8b27568e5605;hp=76b01d196abdd6c0fe4a72dc9987555e5922fdc4;hpb=b90df4ac34f3873c235392568f6b35ec8d56e78f;p=libsvgtiny.git

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index 76b01d1..b80d057 100644
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -73,6 +73,47 @@ static css_error get_libcss_node_data(void *pw, void *node,
 static struct css_select_handler svgtiny_select_handler;
 
 
+/**
+ * Convenient wrapper around css_select_style()
+ *
+ * \param state         The current state of the libsvgtiny parser
+ * \param node          The node that we're getting styles for
+ * \param inline_sheet  The inline stylesheet for the given node
+ * \param result        Address at which to store the results array
+ */
+css_error svgtiny_select_style(struct svgtiny_parse_state *state,
+				dom_element *node,
+				const css_stylesheet *inline_sheet,
+				css_select_results **result)
+{
+	const css_media media_all = {
+		.type = CSS_MEDIA_ALL,
+	};
+
+	/* These magic numbers below were taken from the libcss
+	 * example program without much thought, because at the moment
+	 * we don't support any properties with units. */
+	const css_unit_ctx unitctx = {
+		.viewport_width    = FLTTOFIX(state->viewport_width),
+		.viewport_height   = FLTTOFIX(state->viewport_height),
+		.font_size_default = FLTTOFIX(16.0),
+		.font_size_minimum = FLTTOFIX(6.0),
+		.device_dpi        = FLTTOFIX(96.0),
+		.root_style        = NULL,
+		.pw                = NULL,
+		.measure           = NULL,
+	};
+
+	return css_select_style(state->select_ctx,
+			node,
+			&unitctx,
+			&media_all,
+			inline_sheet,
+			&svgtiny_select_handler,
+			state,
+			result);
+}
+
 /**
  * Resolve a relative URL to an absolute one by doing nothing. This is
  * the simplest possible implementation of a URL resolver, needed for
@@ -1860,6 +1901,57 @@ css_error ua_default_for_property(void *pw, uint32_t property,
 }
 
 
+/**
+ * A "user handler" function that we pass to dom_node_set_user_data()
+ * in set_libcss_node_data(). The set_libcss_node_data() documentation
+ * says that if the node (on which data is set) is is deleted or
+ * cloned, or if its ancestors are modified, then we must call
+ * css_libcss_node_data_handler() on the user data. This function
+ * basically just checks to see which DOM event has happened and
+ * calls css_libcss_node_data_handler() when any of those criteria
+ * are met.
+ */
+static void svgtiny_dom_user_data_handler(dom_node_operation operation,
+	dom_string *key, void *data, struct dom_node *src,
+	struct dom_node *dst)
+{
+	/* We only care about the userdata that is identified by our
+	 * userdata key. Unfortunately I see no obvious way to obtain
+	 * the copy of the userdata key that is already interned in
+	 * svgtiny_strings.h; so we duplicate it here (ugh). */
+	dom_string *str;
+	dom_string_create((const uint8_t *)"_libcss_user_data", 17, &str);
+	if (dom_string_isequal(str,key) == false || data == NULL) {
+		/* Wrong key, or no data */
+		return;
+	}
+
+	/* Check the DOM operation, and make the corresponding call to
+	 * css_libcss_node_data_handler(). No error handling is done.
+	 */
+	switch (operation) {
+		case DOM_NODE_CLONED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_CLONED,
+						NULL, src, dst, data);
+			break;
+		case DOM_NODE_RENAMED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_MODIFIED,
+						NULL, src, NULL, data);
+			break;
+		case DOM_NODE_IMPORTED:
+		case DOM_NODE_ADOPTED:
+		case DOM_NODE_DELETED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_DELETED,
+						NULL, src, NULL, data);
+		default:
+			/* Our list of cases should have been exhaustive */
+			assert(false);
+	}
+}
+
 /**
  * Store libcss data on a node
  *
@@ -1880,15 +1972,12 @@ css_error set_libcss_node_data(void *pw, void *node,
 	void *old_data;
 
 	/* A unique "userdata key" (a string) is used to identify this
-	 * data. The fourth parameter (NULL) is a "user handler
-	 * function." We will eventually have one, but for now we set
-	 * it to NULL to avoid a circular reference mess that would
-	 * break the build temporarily. */
+	 * data. */
 	state = (struct svgtiny_parse_state *)pw;
 	dom_node_set_user_data((dom_node *)node,
 				state->interned_userdata_key,
 				libcss_node_data,
-				NULL,
+				svgtiny_dom_user_data_handler,
 				&old_data);
 
 	/* dom_node_set_user_data() always returns DOM_NO_ERR */
@@ -1969,3 +2058,5 @@ static css_select_handler svgtiny_select_handler = {
 	set_libcss_node_data,
 	get_libcss_node_data,
 };
+
+