[libchamplain] Firt version of the demo that downloads an image
- From: Pierre-Luc Beaudoin <plbeaudoin src gnome org>
- To: svn-commits-list gnome org
- Cc:
- Subject: [libchamplain] Firt version of the demo that downloads an image
- Date: Wed, 26 Aug 2009 12:42:00 +0000 (UTC)
commit 828937764879410cba6425f509edee379c7cad2d
Author: Emmanuel Rodriguez <emmanuel rodriguez gmail com>
Date: Wed Apr 15 20:30:35 2009 +0200
Firt version of the demo that downloads an image
demos/image.c | 214 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 214 insertions(+), 0 deletions(-)
---
diff --git a/demos/image.c b/demos/image.c
new file mode 100644
index 0000000..47e10c7
--- /dev/null
+++ b/demos/image.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2009 Emmanuel Rodriguez <emmanuel rodriguez gmail com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <champlain/champlain.h>
+#include <libsoup/soup.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+
+/**
+ * Transforms a pixbuf into a Clutter texture.
+ */
+static ClutterActor*
+pixbuf_to_texture (GdkPixbuf *pixbuf, GError **error)
+{
+ ClutterActor *texture = NULL;
+ const guchar *data;
+ gboolean has_alpha, success;
+ int width, height, rowstride;
+ ClutterTextureFlags flags = 0;
+
+ data = gdk_pixbuf_get_pixels (pixbuf);
+ width = gdk_pixbuf_get_width (pixbuf);
+ height = gdk_pixbuf_get_height (pixbuf);
+ has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
+ rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+
+ texture = clutter_texture_new ();
+ success = clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (texture),
+ data,
+ has_alpha,
+ width,
+ height,
+ rowstride,
+ (has_alpha ? 4 : 3),
+ flags,
+ error);
+ if (! success) {
+ g_print ("Failed to create the texture\n");
+ clutter_actor_destroy (CLUTTER_ACTOR (texture));
+ return NULL;
+ }
+
+ g_print ("Created the texture\n");
+ return texture;
+}
+
+
+/**
+ * Called when an image has been downloaded. This callback will transform the
+ * image data (binary chunk sent by the remote web server) into a valid Clutter
+ * actor (a texture) and will use this as the source image for a new marker. The
+ * marker will then be added to an existing layer.
+ *
+ * This callback expects the parameter data to be a valid ChamplainLayer.
+ */
+static void
+image_downloaded_cb (SoupSession *session,
+ SoupMessage *message,
+ gpointer data)
+{
+ ChamplainLayer *layer = NULL;
+ SoupURI *uri = NULL;
+ char *url = NULL;
+ const gchar *mime_type = NULL;
+ GdkPixbufLoader *loader = NULL;
+ GError *error = NULL;
+ GdkPixbuf *pixbuf = NULL;
+ ClutterActor *texture = NULL;
+ ClutterActor *marker = NULL;
+
+ g_print("Downloaded the image\n");
+ if (data == NULL) {
+ g_print ("Missing the data pointer\n");
+ goto cleanup;
+ }
+
+ /* Deal only with finished messages */
+ g_print ("message->status_code = %d\n", message->status_code);
+ if (! SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {
+ g_print ("SOUP message isn't finished\n");
+ goto cleanup;
+ }
+
+ uri = soup_message_get_uri (message);
+ url = soup_uri_to_string (uri, FALSE);
+
+ /* Deal only with successful messages */
+ if (! SOUP_STATUS_IS_SUCCESSFUL (message->status_code)) {
+ g_print ("Skipping download of %s since server returned error code %d\n", url, message->status_code);
+ goto cleanup;
+ }
+
+ /* Make sure that we downloaded an image */
+ mime_type = soup_message_headers_get (message->response_headers, "Content-Type");
+
+
+ /* First transform the image into a pixbuf */
+ loader = gdk_pixbuf_loader_new_with_mime_type (mime_type, &error);
+ if (error) {
+ g_print ("Can't build a PixbufLoader that will parse a %s image %s\n", mime_type, error->message);
+ if (loader) {gdk_pixbuf_loader_close (loader, NULL);}
+ goto cleanup;
+ }
+ gdk_pixbuf_loader_write (
+ loader,
+ message->response_body->data,
+ message->response_body->length,
+ &error);
+ if (error) {
+ g_print ("Can't parse the image %s: %s\n", url, error->message);
+ gdk_pixbuf_loader_close (loader, NULL);
+ goto cleanup;
+ }
+
+ gdk_pixbuf_loader_close (loader, &error);
+ if (error) {
+ g_print ("Can't close the parser for image %s: %s\n", url, error->message);
+ goto cleanup;
+ }
+ pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
+ if (pixbuf == NULL) {
+ goto cleanup;
+ }
+ g_print ("Got a pixbuf\n");
+
+ /* Then transform the pixbuf into a texture */
+ texture = pixbuf_to_texture (pixbuf, &error);
+ if (error) {
+ g_print ("Can't convert the pixbuf into a texture for image %s: %s\n", url, error->message);
+ goto cleanup;
+ }
+ g_print ("Got a texture\n");
+
+ /* Finally create a marker with the texture */
+ layer = CHAMPLAIN_LAYER (data);
+ marker = champlain_marker_new_with_image (texture);
+ texture = NULL;
+ champlain_base_marker_set_position (CHAMPLAIN_BASE_MARKER (marker), 45.466, -73.75);
+ clutter_container_add (CLUTTER_CONTAINER (layer), marker, NULL);
+ clutter_actor_show_all (marker);
+
+ /* Cleanup part, the function will always exit here even in case of error */
+ cleanup:
+ g_free (url);
+ if (loader) {g_object_unref (G_OBJECT (loader));}
+ if (texture) {clutter_actor_destroy (CLUTTER_ACTOR (texture));}
+ return;
+}
+
+
+static void
+create_marker_from_url (ChamplainLayer *layer,
+ SoupSession *session,
+ const gchar *url)
+{
+ SoupMessage *message;
+
+ message = soup_message_new ("GET", url);
+ soup_session_queue_message (session, message, image_downloaded_cb, layer);
+ g_print ("Downloading %s\n", url);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+ ClutterActor* actor, *stage;
+ ChamplainLayer *layer;
+ SoupSession *session;
+
+ g_thread_init (NULL);
+ clutter_init (&argc, &argv);
+
+ stage = clutter_stage_get_default ();
+ clutter_actor_set_size (stage, 800, 600);
+
+ /* Create the map view */
+ actor = champlain_view_new ();
+ champlain_view_set_size (CHAMPLAIN_VIEW (actor), 800, 600);
+ clutter_container_add_actor (CLUTTER_CONTAINER (stage), actor);
+
+ /* Create the markers and marker layer */
+ layer = champlain_layer_new ();
+ champlain_view_add_layer (CHAMPLAIN_VIEW (actor), layer);
+ session = soup_session_async_new ();
+ create_marker_from_url (layer, session, "http://hexten.net/cpan-faces/potyl.jpg");
+
+ /* Finish initialising the map view */
+ g_object_set (G_OBJECT (actor), "zoom-level", 12,
+ "scroll-mode", CHAMPLAIN_SCROLL_MODE_KINETIC, NULL);
+ champlain_view_center_on (CHAMPLAIN_VIEW(actor), 45.466, -73.75);
+
+ clutter_actor_show (stage);
+ clutter_main ();
+
+ g_object_unref (session);
+
+ return 0;
+}
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