diff options
Diffstat (limited to 'gtk+-mingw/share/gtk-3.0/demo/pixbufs.c')
| -rw-r--r-- | gtk+-mingw/share/gtk-3.0/demo/pixbufs.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/gtk+-mingw/share/gtk-3.0/demo/pixbufs.c b/gtk+-mingw/share/gtk-3.0/demo/pixbufs.c deleted file mode 100644 index 9b29b5a..0000000 --- a/gtk+-mingw/share/gtk-3.0/demo/pixbufs.c +++ /dev/null @@ -1,263 +0,0 @@ -/* Pixbufs - * - * A GdkPixbuf represents an image, normally in RGB or RGBA format. - * Pixbufs are normally used to load files from disk and perform - * image scaling. - * - * This demo is not all that educational, but looks cool. It was written - * by Extreme Pixbuf Hacker Federico Mena Quintero. It also shows - * off how to use GtkDrawingArea to do a simple animation. - * - * Look at the Image demo for additional pixbuf usage examples. - * - */ - -#include <stdlib.h> -#include <gtk/gtk.h> -#include <math.h> - -#include "demo-common.h" - -#define FRAME_DELAY 50 - -#define BACKGROUND_NAME "background.jpg" - -static const char *image_names[] = { - "apple-red.png", - "gnome-applets.png", - "gnome-calendar.png", - "gnome-foot.png", - "gnome-gmush.png", - "gnome-gimp.png", - "gnome-gsame.png", - "gnu-keys.png" -}; - -#define N_IMAGES G_N_ELEMENTS (image_names) - -/* demo window */ -static GtkWidget *window = NULL; - -/* Current frame */ -static GdkPixbuf *frame; - -/* Background image */ -static GdkPixbuf *background; -static gint back_width, back_height; - -/* Images */ -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) -{ - gint i; - char *filename; - - if (background) - return TRUE; /* already loaded earlier */ - - /* demo_find_file() looks in the current directory first, - * so you can run gtk-demo without installing GTK, then looks - * in the location where the file is installed. - */ - filename = demo_find_file (BACKGROUND_NAME, error); - if (!filename) - return FALSE; /* note that "error" was filled in and returned */ - - background = gdk_pixbuf_new_from_file (filename, error); - g_free (filename); - - if (!background) - return FALSE; /* Note that "error" was filled with a GError */ - - back_width = gdk_pixbuf_get_width (background); - back_height = gdk_pixbuf_get_height (background); - - for (i = 0; i < N_IMAGES; i++) - { - filename = demo_find_file (image_names[i], error); - if (!filename) - return FALSE; /* Note that "error" was filled with a GError */ - - images[i] = gdk_pixbuf_new_from_file (filename, error); - g_free (filename); - - if (!images[i]) - return FALSE; /* Note that "error" was filled with a GError */ - } - - return TRUE; -} - -/* Expose callback for the drawing area */ -static gint -draw_cb (GtkWidget *widget, - cairo_t *cr, - gpointer data) -{ - gdk_cairo_set_source_pixbuf (cr, frame, 0, 0); - cairo_paint (cr); - - return TRUE; -} - -#define CYCLE_LEN 60 - -static int frame_num; - -/* Timeout handler to regenerate the frame */ -static gint -timeout (gpointer data) -{ - double f; - int i; - double xmid, ymid; - double radius; - - gdk_pixbuf_copy_area (background, 0, 0, back_width, back_height, - frame, 0, 0); - - f = (double) (frame_num % CYCLE_LEN) / CYCLE_LEN; - - xmid = back_width / 2.0; - ymid = back_height / 2.0; - - radius = MIN (xmid, ymid) / 2.0; - - for (i = 0; i < N_IMAGES; i++) - { - double ang; - int xpos, ypos; - int iw, ih; - double r; - GdkRectangle r1, r2, dest; - double k; - - ang = 2.0 * G_PI * (double) i / N_IMAGES - f * 2.0 * G_PI; - - iw = gdk_pixbuf_get_width (images[i]); - ih = gdk_pixbuf_get_height (images[i]); - - r = radius + (radius / 3.0) * sin (f * 2.0 * G_PI); - - xpos = floor (xmid + r * cos (ang) - iw / 2.0 + 0.5); - ypos = floor (ymid + r * sin (ang) - ih / 2.0 + 0.5); - - k = (i & 1) ? sin (f * 2.0 * G_PI) : cos (f * 2.0 * G_PI); - k = 2.0 * k * k; - k = MAX (0.25, k); - - r1.x = xpos; - r1.y = ypos; - r1.width = iw * k; - r1.height = ih * k; - - r2.x = 0; - r2.y = 0; - r2.width = back_width; - 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 * G_PI))) - : MAX (127, fabs (255 * cos (f * 2.0 * G_PI))))); - } - - GDK_THREADS_ENTER (); - gtk_widget_queue_draw (da); - GDK_THREADS_LEAVE (); - - frame_num++; - return G_SOURCE_CONTINUE; -} - -static guint timeout_id; - -static void -cleanup_callback (GObject *object, - gpointer data) -{ - g_source_remove (timeout_id); - timeout_id = 0; -} - -GtkWidget * -do_pixbufs (GtkWidget *do_widget) -{ - if (!window) - { - GError *error; - - window = gtk_window_new (GTK_WINDOW_TOPLEVEL); - gtk_window_set_screen (GTK_WINDOW (window), - gtk_widget_get_screen (do_widget)); - gtk_window_set_title (GTK_WINDOW (window), "Pixbufs"); - gtk_window_set_resizable (GTK_WINDOW (window), FALSE); - - g_signal_connect (window, "destroy", - G_CALLBACK (gtk_widget_destroyed), &window); - g_signal_connect (window, "destroy", - G_CALLBACK (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); - - g_signal_connect (dialog, "response", - G_CALLBACK (gtk_widget_destroy), NULL); - - gtk_widget_show (dialog); - } - else - { - gtk_widget_set_size_request (window, back_width, back_height); - - frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height); - - da = gtk_drawing_area_new (); - - g_signal_connect (da, "draw", - G_CALLBACK (draw_cb), NULL); - - gtk_container_add (GTK_CONTAINER (window), da); - - timeout_id = g_timeout_add (FRAME_DELAY, timeout, NULL); - } - } - - if (!gtk_widget_get_visible (window)) - { - gtk_widget_show_all (window); - } - else - { - gtk_widget_destroy (window); - window = NULL; - g_object_unref (frame); - } - - return window; -} |