Commit 9df3e653 authored by Federico Mena Quintero's avatar Federico Mena Quintero Committed by Federico Mena Quintero

It was cold and rainy this Saturday morning, so I needed something to warm

2000-06-10  Federico Mena Quintero  <federico@helixcode.com>

	* demo/pixbuf-demo.c: It was cold and rainy this Saturday morning,
	so I needed something to warm my thighs.  Running plain infinite
	loops on your laptop to make it hot is not very much fun.  A demo
	of the gdk-pixbuf scaling functions is way better, and looks
	prettier, too.

	* configure.in (AC_OUTPUT): Added the demo Makefile.

	* Makefile.am (SUBDIRS): Added the demo directory.
parent 62e51198
/* 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>
#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;
/* 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;
}
......@@ -29,19 +29,41 @@ gboolean
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,
......
2000-06-10 Federico Mena Quintero <federico@helixcode.com>
* demo/pixbuf-demo.c: It was cold and rainy this Saturday morning,
so I needed something to warm my thighs. Running plain infinite
loops on your laptop to make it hot is not very much fun. A demo
of the gdk-pixbuf scaling functions is way better, and looks
prettier, too.
* configure.in (AC_OUTPUT): Added the demo Makefile.
* Makefile.am (SUBDIRS): Added the demo directory.
2000-06-09 Larry Ewing <lewing@helixcode.com>
* gdk-pixbuf/io-png.c (gdk_pixbuf__png_image_load_increment):
......
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