+++ /dev/null
-/* 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>
-
-#define BACKGROUND_NAME "/pixbufs/background.jpg"
-
-static const char *image_names[] = {
- "/pixbufs/apple-red.png",
- "/pixbufs/gnome-applets.png",
- "/pixbufs/gnome-calendar.png",
- "/pixbufs/gnome-foot.png",
- "/pixbufs/gnome-gmush.png",
- "/pixbufs/gnome-gimp.png",
- "/pixbufs/gnome-gsame.png",
- "/pixbufs/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 int 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)
-{
- int i;
-
- if (background)
- return TRUE; /* already loaded earlier */
-
- background = gdk_pixbuf_new_from_resource (BACKGROUND_NAME, error);
- 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++)
- {
- images[i] = gdk_pixbuf_new_from_resource (image_names[i], error);
-
- if (!images[i])
- return FALSE; /* Note that "error" was filled with a GError */
- }
-
- return TRUE;
-}
-
-/* Expose callback for the drawing area */
-static void
-draw_func (GtkDrawingArea *area,
- cairo_t *cr,
- int width,
- int height,
- gpointer data)
-{
- gdk_cairo_set_source_pixbuf (cr, frame, 0, 0);
- cairo_paint (cr);
-}
-
-#define CYCLE_TIME 3000000 /* 3 seconds */
-
-static gint64 start_time;
-
-/* Handler to regenerate the frame */
-static gboolean
-on_tick (GtkWidget *widget,
- GdkFrameClock *frame_clock,
- gpointer data)
-{
- gint64 current_time;
- double f;
- int i;
- double xmid, ymid;
- double radius;
-
- gdk_pixbuf_copy_area (background, 0, 0, back_width, back_height,
- frame, 0, 0);
-
- if (start_time == 0)
- start_time = gdk_frame_clock_get_frame_time (frame_clock);
-
- current_time = gdk_frame_clock_get_frame_time (frame_clock);
- f = ((current_time - start_time) % CYCLE_TIME) / (double)CYCLE_TIME;
-
- 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)))));
- }
-
- gtk_widget_queue_draw (da);
-
- return G_SOURCE_CONTINUE;
-}
-
-GtkWidget *
-do_pixbufs (GtkWidget *do_widget)
-{
- if (!window)
- {
- GError *error;
-
- window = gtk_window_new ();
- gtk_window_set_display (GTK_WINDOW (window),
- gtk_widget_get_display (do_widget));
- gtk_window_set_title (GTK_WINDOW (window), "Pixbufs");
- gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
- g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
-
- 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_window_destroy), NULL);
-
- gtk_widget_show (dialog);
- }
- else
- {
- frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height);
-
- da = gtk_drawing_area_new ();
-
- gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (da), back_width);
- gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (da), back_height);
- gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_func, NULL, NULL);
-
- gtk_window_set_child (GTK_WINDOW (window), da);
-
- gtk_widget_add_tick_callback (da, on_tick, NULL, NULL);
- }
- }
-
- if (!gtk_widget_get_visible (window))
- gtk_widget_show (window);
- else
- {
- gtk_window_destroy (GTK_WINDOW (window));
- g_object_unref (frame);
- }
-
- return window;
-}
projects / gtk4.git / commitdiff