Add JPEG export support

src/ag-chart.c

@@ -11,6 +11,8 @@
 #include <math.h>
 #include <string.h>
 #include <librsvg/rsvg.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <glib/gi18n.h>
 
 #include "config.h"
 #include "astrognome.h"
@@ -1781,6 +1783,72 @@ 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)
+{
+    gchar      *svg,
+               *jpg;
+    gsize      svg_length,
+               jpg_length;
+    RsvgHandle *svg_handle;
+    GdkPixbuf  *pixbuf;
+
+    if ((svg = ag_chart_create_svg(chart, &svg_length, TRUE, err)) == NULL) {
+        return;
+    }
+
+    if ((svg_handle = rsvg_handle_new_from_data(
+                 (const guint8 *)svg,
+                svg_length,
+                err
+            )) == NULL) {
+        g_free(svg);
+
+        return;
+    }
+
+    g_free(svg);
+
+    if ((pixbuf = rsvg_handle_get_pixbuf(svg_handle)) == NULL) {
+        g_set_error(
+                err,
+                AG_CHART_ERROR, AG_CHART_ERROR_RENDERING_ERROR,
+                _("Unknown rendering error")
+            );
+
+        return;
+    }
+
+    if (!gdk_pixbuf_save_to_buffer(
+                pixbuf,
+                &jpg,
+                &jpg_length,
+                "jpeg",
+                err,
+                NULL
+            )) {
+        g_object_unref(pixbuf);
+
+        return;
+    }
+
+    g_object_unref(pixbuf);
+
+    g_file_replace_contents(
+            file,
+            (const gchar *)jpg,
+            jpg_length,
+            NULL,
+            FALSE,
+            G_FILE_CREATE_NONE,
+            NULL,
+            NULL,
+            err
+        );
+
+    g_free(jpg);
+}
+
 void
 ag_chart_set_note(AgChart *chart, const gchar *note)
 {

src/ag-chart.h

@@ -17,6 +17,7 @@ typedef enum {
     AG_CHART_ERROR_NOT_IMPLEMENTED,
     AG_CHART_ERROR_INVALID_PLAC_FILE,
     AG_CHART_ERROR_UNSUPPORTED_PLAC_FILE,
+    AG_CHART_ERROR_RENDERING_ERROR,
 } AgChartError;
 
 #define AG_TYPE_CHART         (ag_chart_get_type())
@@ -69,6 +70,10 @@ void 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);
+
 void ag_chart_set_name(AgChart     *chart,
                        const gchar *name);
 

src/ag-window.c

@@ -859,6 +859,7 @@ ag_window_export_image(AgWindow *window, GError **err)
                                      _("_Save"), GTK_RESPONSE_ACCEPT,
                                      NULL);
     gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(fs), filter_svg);
+    gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(fs), filter_jpg);
     gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(fs), filter_svg);
     gtk_dialog_set_default_response(GTK_DIALOG(fs), GTK_RESPONSE_ACCEPT);
     gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(fs), FALSE);
@@ -887,6 +888,9 @@ ag_window_export_image(AgWindow *window, GError **err)
             if (filter == filter_svg) {
                 extension = ".svg";
                 save_func = &ag_chart_export_svg_to_file;
+            } else if (filter == filter_jpg) {
+                extension = ".jpg";
+                save_func = &ag_chart_export_jpg_to_file;
             } else {
                 g_warning("Unknown file type");
                 gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(fs), filter_svg);

src/astrognome.c

@@ -25,6 +25,7 @@ GtkFileFilter *filter_all   = NULL;
 GtkFileFilter *filter_chart = NULL;
 GtkFileFilter *filter_hor   = NULL;
 GtkFileFilter *filter_svg   = NULL;
+GtkFileFilter *filter_jpg   = NULL;
 GtkTreeModel  *country_list = NULL;
 GtkTreeModel  *city_list    = NULL;
 GHashTable    *xinclude_positions;
@@ -90,6 +91,13 @@ init_filters(void)
     gtk_file_filter_set_name(filter_svg, _("SVG image"));
     gtk_file_filter_add_pattern(filter_svg, "*.svg");
     g_object_ref_sink(filter_svg);
+
+    filter_jpg = gtk_file_filter_new();
+    gtk_file_filter_set_name(filter_jpg, _("JPEG image"));
+    gtk_file_filter_add_pattern(filter_jpg, "*.jpg");
+    gtk_file_filter_add_pattern(filter_jpg, "*.jpe");
+    gtk_file_filter_add_pattern(filter_jpg, "*.jpeg");
+    g_object_ref_sink(filter_jpg);
 }
 
 static int

src/astrognome.h

@@ -14,6 +14,7 @@ extern GtkFileFilter    *filter_all;
 extern GtkFileFilter    *filter_chart;
 extern GtkFileFilter    *filter_hor;
 extern GtkFileFilter    *filter_svg;
+extern GtkFileFilter    *filter_jpg;
 extern GtkTreeModel     *country_list;
 extern GtkTreeModel     *city_list;
 extern const GswePlanet used_planets[];