--- /dev/null
+/* GdkPixbuf library - Scaling and compositing demo
+ *
+ * Copyright (C) 1999 The Free Software Foundation
+ *
+ * Authors: Federico Mena-Quintero <federico@gimp.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <gtk/gtk.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <math.h>
+
+\f
+
+#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 (sizeof (image_names) / sizeof (image_names[0]))
+
+/* Current frame */
+static GdkPixbuf *frame;
+
+/* Background image */
+static GdkPixbuf *background;
+int back_width, back_height;
+
+/* Images */
+static GdkPixbuf *images[N_IMAGES];
+
+/* Widgets */
+GtkWidget *da;
+
+\f
+
+/* Loads the images for the demo and returns whether the operation succeeded */
+static gboolean
+load_pixbufs (void)
+{
+ int i;
+
+ background = gdk_pixbuf_new_from_file (BACKGROUND_NAME);
+ if (!background)
+ return FALSE;
+
+ 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_file (image_names[i]);
+ if (!images[i])
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Expose callback for the drawing area */
+static gint
+expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
+{
+ guchar *pixels;
+ int rowstride;
+
+ 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);
+
+ 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 * M_PI * (double) i / N_IMAGES - f * 2.0 * M_PI;
+
+ iw = gdk_pixbuf_get_width (images[i]);
+ ih = gdk_pixbuf_get_height (images[i]);
+
+ r = radius + (radius / 3.0) * sin (f * 2.0 * M_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 * M_PI) : cos (f * 2.0 * M_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 * M_PI)))
+ : MAX (127, fabs (255 * cos (f * 2.0 * M_PI)))));
+ }
+
+ gtk_widget_draw (da, NULL);
+
+ frame_num++;
+ return TRUE;
+}
+
+static guint timeout_id;
+
+/* Destroy handler for the window */
+static void
+destroy_cb (GtkObject *object, gpointer data)
+{
+ gtk_timeout_remove (timeout_id);
+ timeout_id = 0;
+
+ gtk_main_quit ();
+}
+
+int
+main (int argc, char **argv)
+{
+ GtkWidget *window;
+
+ gtk_init (&argc, &argv);
+ gdk_rgb_init ();
+
+ if (!load_pixbufs ()) {
+ g_message ("main(): Could not load all the pixbufs!");
+ exit (EXIT_FAILURE);
+ }
+
+ frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height);
+
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ gtk_widget_set_usize (window, back_width, back_height);
+ gtk_window_set_policy (GTK_WINDOW (window), FALSE, FALSE, FALSE);
+
+ gtk_signal_connect (GTK_OBJECT (window), "destroy",
+ GTK_SIGNAL_FUNC (destroy_cb), NULL);
+
+ 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_show_all (window);
+ gtk_main ();
+
+ return 0;
+}
expose_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
GdkPixbuf *dest;
+ GdkGC *gc;
+ GdkColormap *colormap;
+ GdkColor color;
- gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
+ color.red = 0xffff;
+ color.green = 0xffff;
+ color.blue = 0xffff;
- dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, event->area.width, event->area.height);
+ gc = gdk_gc_new (widget->window);
+ colormap = gdk_window_get_colormap (widget->window);
+ gdk_colormap_alloc_color (colormap, &color, TRUE, TRUE);
+ gdk_gc_set_foreground (gc, &color);
+ gdk_draw_rectangle (widget->window, gc,
+ TRUE,
+ event->area.x,
+ event->area.y,
+ event->area.width, event->area.height);
+
+ gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
- gdk_pixbuf_composite_color (pixbuf, dest,
- 0, 0, event->area.width, event->area.height,
- -event->area.x, -event->area.y,
- (double) widget->allocation.width / gdk_pixbuf_get_width (pixbuf),
- (double) widget->allocation.height / gdk_pixbuf_get_height (pixbuf),
- interp_type, overall_alpha,
- event->area.x, event->area.y, 16, 0xaaaaaa, 0x555555);
+ dest = gdk_pixbuf_get_from_drawable(NULL,
+ widget->window,
+ gdk_window_get_colormap (widget->window),
+ event->area.x,
+ event->area.y,
+ 0, 0, event->area.width, event->area.height);
+
+ gdk_pixbuf_composite (pixbuf, dest,
+ 0, 0, event->area.width, event->area.height,
+ -event->area.x, -event->area.y,
+ (double) widget->allocation.width / gdk_pixbuf_get_width (pixbuf),
+ (double) widget->allocation.height / gdk_pixbuf_get_height (pixbuf),
+ interp_type, overall_alpha);
+
gdk_pixbuf_render_to_drawable (dest, widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
0, 0, event->area.x, event->area.y,
event->area.width, event->area.height,
projects / ~andy / gtk / commitdiff
