src/svgtiny_css.c: add svgtiny_select_style() wrapper

Some boilerplate will be needed when we call css_select_style() during
parsing. In preparation for (avoiding) that, we factor it out into a
convenience function called svgtiny_select_style().

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index 0c18534f97e5ffb9f26977e3a87531742bb41c01..3ac078a9ae0e252e087b9c79d366e711e8182a39 100644 (file)
--- 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