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cssimage: Only load image data when needed

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Saves ~6MB of memory per application in the Adwaita I am using - at
least until the app starts using all the images in the theme, because
the code doesn't discard images yet once they were loaded.

https://bugzilla.gnome.org/show_bug.cgi?id=692934
This commit is contained in:
Benjamin Otte 2013-02-02 01:42:04 +01:00
parent b2e1b1124f
commit e6b3cbe7d2
1 changed files with 49 additions and 37 deletions
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86
gtk/gtkcssimageurl.c
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@ -29,6 +29,55 @@ G_DEFINE_TYPE (GtkCssImageUrl, _gtk_css_image_url, GTK_TYPE_CSS_IMAGE)
static GtkCssImage *
gtk_css_image_url_load_image (GtkCssImageUrl *url)
{
GdkPixbuf *pixbuf;
GError *error = NULL;
GFileInputStream *input;
if (url->loaded_image)
return url->loaded_image;
/* We special case resources here so we can use
gdk_pixbuf_new_from_resource, which in turn has some special casing
for GdkPixdata files to avoid duplicating the memory for the pixbufs */
if (g_file_has_uri_scheme (url->file, "resource"))
{
char *uri = g_file_get_uri (url->file);
char *resource_path = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
g_free (resource_path);
g_free (uri);
}
else
{
input = g_file_read (url->file, NULL, &error);
if (input != NULL)
{
pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
g_object_unref (input);
}
else
{
pixbuf = NULL;
}
}
if (pixbuf == NULL)
{
cairo_surface_t *empty = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 0, 0);
/* XXX: Can we get the error somehow sent to the CssProvider?
* I don't like just dumping it to stderr or losing it completely. */
g_warning ("Error loading image: %s", error->message);
g_error_free (error);
url->loaded_image = _gtk_css_image_surface_new (empty);
cairo_surface_destroy (empty);
return url->loaded_image;
}
url->loaded_image = _gtk_css_image_surface_new_for_pixbuf (pixbuf);
g_object_unref (pixbuf);
return url->loaded_image;
}
@ -85,48 +134,11 @@ gtk_css_image_url_parse (GtkCssImage *image,
GtkCssParser *parser)
{
GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
GdkPixbuf *pixbuf;
GError *error = NULL;
GFileInputStream *input;
url->file = _gtk_css_parser_read_url (parser);
if (url->file == NULL)
return FALSE;
/* We special case resources here so we can use
gdk_pixbuf_new_from_resource, which in turn has some special casing
for GdkPixdata files to avoid duplicating the memory for the pixbufs */
if (g_file_has_uri_scheme (url->file, "resource"))
{
char *uri = g_file_get_uri (url->file);
char *resource_path = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
g_free (resource_path);
g_free (uri);
}
else
{
input = g_file_read (url->file, NULL, &error);
if (input == NULL)
{
_gtk_css_parser_take_error (parser, error);
return FALSE;
}
pixbuf = gdk_pixbuf_new_from_stream (G_INPUT_STREAM (input), NULL, &error);
g_object_unref (input);
}
if (pixbuf == NULL)
{
_gtk_css_parser_take_error (parser, error);
return FALSE;
}
url->loaded_image = _gtk_css_image_surface_new_for_pixbuf (pixbuf);
g_object_unref (pixbuf);
return TRUE;
}