diff options
Diffstat (limited to 'demos/gtk-demo/pixbufs.c')
| -rw-r--r-- | demos/gtk-demo/pixbufs.c | 136 |
1 files changed, 67 insertions, 69 deletions
diff --git a/demos/gtk-demo/pixbufs.c b/demos/gtk-demo/pixbufs.c index 6c067098ac..6af7ea676c 100644 --- a/demos/gtk-demo/pixbufs.c +++ b/demos/gtk-demo/pixbufs.c @@ -9,7 +9,7 @@ * off how to use GtkDrawingArea to do a simple animation. * * Look at the Image demo for additional pixbuf usage examples. - * + * */ #include <config.h> @@ -17,8 +17,6 @@ #include <gtk/gtk.h> #include <math.h> - - #define FRAME_DELAY 50 #define RELATIVE_BACKGROUND_NAME "background.jpg" @@ -56,7 +54,7 @@ static GdkPixbuf *frame; /* Background image */ static GdkPixbuf *background; -static int back_width, back_height; +static gint back_width, back_height; /* Images */ static GdkPixbuf *images[N_IMAGES]; @@ -64,18 +62,16 @@ static GdkPixbuf *images[N_IMAGES]; /* Widgets */ static GtkWidget *da; - - /* Loads the images for the demo and returns whether the operation succeeded */ static gboolean load_pixbufs (GError **error) { - int i; - const char **image_names; + gint i; + const gchar **image_names; if (background) return TRUE; /* already loaded earlier */ - + background = gdk_pixbuf_new_from_file (RELATIVE_BACKGROUND_NAME, NULL); if (!background) @@ -83,7 +79,7 @@ load_pixbufs (GError **error) if (!background) return FALSE; /* note that "error" was filled in and returned */ - + back_width = gdk_pixbuf_get_width (background); back_height = gdk_pixbuf_get_height (background); @@ -91,12 +87,12 @@ load_pixbufs (GError **error) image_names = relative_image_names; else image_names = installed_image_names; - + for (i = 0; i < N_IMAGES; i++) { images[i] = gdk_pixbuf_new_from_file (image_names[i], error); if (!images[i]) - return FALSE; /* Note that "error" was filled with a GError */ + return FALSE; /* Note that "error" was filled with a GError */ } return TRUE; @@ -104,7 +100,9 @@ load_pixbufs (GError **error) /* Expose callback for the drawing area */ static gint -expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data) +expose_cb (GtkWidget *widget, + GdkEventExpose *event, + gpointer data) { guchar *pixels; int rowstride; @@ -112,14 +110,14 @@ expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data) rowstride = gdk_pixbuf_get_rowstride (frame); pixels = gdk_pixbuf_get_pixels (frame) + rowstride * event->area.y + event->area.x * 3; - + gdk_draw_rgb_image_dithalign (widget->window, - widget->style->black_gc, - event->area.x, event->area.y, - event->area.width, event->area.height, - GDK_RGB_DITHER_NORMAL, - pixels, rowstride, - event->area.x, event->area.y); + widget->style->black_gc, + event->area.x, event->area.y, + event->area.width, event->area.height, + GDK_RGB_DITHER_NORMAL, + pixels, rowstride, + event->area.x, event->area.y); return TRUE; } @@ -138,7 +136,7 @@ timeout (gpointer data) double radius; gdk_pixbuf_copy_area (background, 0, 0, back_width, back_height, - frame, 0, 0); + frame, 0, 0); f = (double) (frame_num % CYCLE_LEN) / CYCLE_LEN; @@ -181,16 +179,16 @@ timeout (gpointer data) r2.height = back_height; if (gdk_rectangle_intersect (&r1, &r2, &dest)) - gdk_pixbuf_composite (images[i], - frame, - dest.x, dest.y, - dest.width, dest.height, - xpos, ypos, - k, k, - GDK_INTERP_NEAREST, - ((i & 1) - ? MAX (127, fabs (255 * sin (f * 2.0 * M_PI))) - : MAX (127, fabs (255 * cos (f * 2.0 * M_PI))))); + gdk_pixbuf_composite (images[i], + frame, + dest.x, dest.y, + dest.width, dest.height, + xpos, ypos, + k, k, + GDK_INTERP_NEAREST, + ((i & 1) + ? MAX (127, fabs (255 * sin (f * 2.0 * M_PI))) + : MAX (127, fabs (255 * cos (f * 2.0 * M_PI))))); } gtk_widget_queue_draw (da); @@ -203,7 +201,7 @@ static guint timeout_id; static void cleanup_callback (GtkObject *object, - gpointer data) + gpointer data) { g_source_remove (timeout_id); timeout_id = 0; @@ -216,53 +214,53 @@ do_pixbufs (void) { GError *error; - + window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Pixbufs"); gtk_window_set_resizeable (GTK_WINDOW (window), FALSE); - + gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (gtk_widget_destroyed), &window); gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (cleanup_callback), NULL); - + error = NULL; if (!load_pixbufs (&error)) - { - GtkWidget *dialog; - - dialog = gtk_message_dialog_new (GTK_WINDOW (window), - GTK_DIALOG_DESTROY_WITH_PARENT, - GTK_MESSAGE_ERROR, - GTK_BUTTONS_CLOSE, - "Failed to load an image: %s", - error->message); - - g_error_free (error); - - gtk_signal_connect (GTK_OBJECT (dialog), - "response", - GTK_SIGNAL_FUNC (gtk_widget_destroy), - NULL); - - gtk_widget_show (dialog); - } + { + GtkWidget *dialog; + + dialog = gtk_message_dialog_new (GTK_WINDOW (window), + GTK_DIALOG_DESTROY_WITH_PARENT, + GTK_MESSAGE_ERROR, + GTK_BUTTONS_CLOSE, + "Failed to load an image: %s", + error->message); + + g_error_free (error); + + gtk_signal_connect (GTK_OBJECT (dialog), + "response", + GTK_SIGNAL_FUNC (gtk_widget_destroy), + NULL); + + gtk_widget_show (dialog); + } else - { - gtk_widget_set_usize (window, back_width, back_height); - - frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height); - - da = gtk_drawing_area_new (); - - gtk_signal_connect (GTK_OBJECT (da), "expose_event", - GTK_SIGNAL_FUNC (expose_cb), NULL); - - gtk_container_add (GTK_CONTAINER (window), da); - - timeout_id = gtk_timeout_add (FRAME_DELAY, timeout, NULL); - } + { + gtk_widget_set_usize (window, back_width, back_height); + + frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height); + + da = gtk_drawing_area_new (); + + gtk_signal_connect (GTK_OBJECT (da), "expose_event", + GTK_SIGNAL_FUNC (expose_cb), NULL); + + gtk_container_add (GTK_CONTAINER (window), da); + + timeout_id = gtk_timeout_add (FRAME_DELAY, timeout, NULL); + } } - + if (!GTK_WIDGET_VISIBLE (window)) { gtk_widget_show_all (window); |