Add a theme parameter to the SVG/image generating functions

This is needed for image generation to include display themes.
Fixes #82

src/ag-chart.c

@@ -1395,10 +1395,10 @@ ag_chart_sort_planets_by_position(GswePlanetData *planet1,
 }
 
 gchar *
-ag_chart_create_svg(
-        AgChart  *chart,
+ag_chart_create_svg(AgChart        *chart,
                     gsize          *length,
                     gboolean       rendering,
+                    AgDisplayTheme *theme,
                     GError         **err)
 {
     xmlDocPtr         doc = create_save_doc(chart),
@@ -1412,6 +1412,7 @@ ag_chart_create_svg(
                       antiscia_node = NULL,
                       node          = NULL;
     gchar             *value,
+                      *css,
                       *save_content = NULL,
                       **params;
     const gchar       *xslt_content;
@@ -1717,9 +1718,21 @@ ag_chart_create_svg(
         return NULL;
     }
 
-    params = g_new0(gchar *, 3);
+    params    = g_new0(gchar *, 5);
     params[0] = "rendering";
     params[1] = (rendering) ? "'yes'" : "'no'";
+    css       = ag_display_theme_to_css(theme);
+
+    // This seems to be a dirty hack, but it should do for a while
+    if (strlen(css) == 0) {
+        params[2] = NULL;
+        params[3] = NULL;
+    } else {
+        params[2] = "additional-css";
+        params[3] = g_strdup_printf("\"%s\"", css);
+    }
+
+    g_free(css);
 
     // libxml2 messes up the output, as it prints decimal floating point
     // numbers in a localized format. It is not good in locales that use a
@@ -1732,6 +1745,7 @@ ag_chart_create_svg(
     uselocale(current_locale);
     xsltFreeStylesheet(xslt_proc);
     xmlFreeDoc(doc);
+    g_free(params[3]);
     g_free(params);
 
     // Now, svg_doc contains the generated SVG file
@@ -1761,12 +1775,15 @@ ag_chart_get_planets(AgChart *chart)
 }
 
 void
-ag_chart_export_svg_to_file(AgChart *chart, GFile *file, GError **err)
+ag_chart_export_svg_to_file(AgChart        *chart,
+                            GFile          *file,
+                            AgDisplayTheme *theme,
+                            GError         **err)
 {
     gchar *svg;
     gsize length;
 
-    if ((svg = ag_chart_create_svg(chart, &length, TRUE, err)) == NULL) {
+    if ((svg = ag_chart_create_svg(chart, &length, TRUE, theme, err)) == NULL) {
         return;
     }
 
@@ -1784,7 +1801,10 @@ ag_chart_export_svg_to_file(AgChart *chart, GFile *file, GError **err)
 }
 
 void
-ag_chart_export_jpg_to_file(AgChart *chart, GFile *file, GError **err)
+ag_chart_export_jpg_to_file(AgChart        *chart,
+                            GFile          *file,
+                            AgDisplayTheme *theme,
+                            GError         **err)
 {
     gchar      *svg,
                *jpg;
@@ -1793,7 +1813,13 @@ ag_chart_export_jpg_to_file(AgChart *chart, GFile *file, GError **err)
     RsvgHandle *svg_handle;
     GdkPixbuf  *pixbuf;
 
-    if ((svg = ag_chart_create_svg(chart, &svg_length, TRUE, err)) == NULL) {
+    if ((svg = ag_chart_create_svg(
+                chart,
+                &svg_length,
+                TRUE,
+                theme,
+                err
+            )) == NULL) {
         return;
     }
 

src/ag-chart.h

@@ -6,6 +6,7 @@
 #include <swe-glib.h>
 
 #include "ag-db.h"
+#include "ag-display-theme.h"
 
 G_BEGIN_DECLS
 
@@ -44,7 +45,7 @@ struct _AgChartClass {
     GsweMomentClass parent_class;
 };
 
-typedef void (*AgChartSaveImageFunc)(AgChart *, GFile *, GError **);
+typedef void (*AgChartSaveImageFunc)(AgChart *, GFile *, AgDisplayTheme *, GError **);
 
 GType ag_chart_get_type(void) G_GNUC_CONST;
 
@@ -68,10 +69,12 @@ void ag_chart_save_to_file(AgChart *chart,
 
 void ag_chart_export_svg_to_file(AgChart        *chart,
                                  GFile          *file,
+                                 AgDisplayTheme *theme,
                                  GError         **err);
 
 void ag_chart_export_jpg_to_file(AgChart        *chart,
                                  GFile          *file,
+                                 AgDisplayTheme *theme,
                                  GError         **err);
 
 void ag_chart_set_name(AgChart     *chart,
@@ -92,6 +95,7 @@ const gchar *ag_chart_get_city(AgChart *chart);
 gchar *ag_chart_create_svg(AgChart        *chart,
                            gsize          *length,
                            gboolean       rendering,
+                           AgDisplayTheme *theme,
                            GError         **err);
 
 GList *ag_chart_get_planets(AgChart *chart);

src/ag-window.c

@@ -498,6 +498,7 @@ ag_window_redraw_chart(AgWindow *window)
             priv->chart,
             &length,
             FALSE,
+            NULL,
             &err
         );
 
@@ -1034,7 +1035,7 @@ ag_window_export_image(AgWindow *window, GError **err)
 
             if (can_save) {
                 g_clear_error(&local_err);
-                save_func(priv->chart, file, &local_err);
+                save_func(priv->chart, file, priv->theme, &local_err);
 
                 if (local_err) {
                     ag_app_message_dialog(

src/resources/ui/chart-default.xsl

@@ -75,6 +75,9 @@
                 <style type="text/css">
                   <xi:include href="gres://ui/chart-default.css" parse="text"/>
                 </style>
+                <style type="text/css">
+                  <xsl:value-of select="$additional-css"/>
+                </style>
               </xsl:when>
             </xsl:choose>