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#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <stdlib.h>
static gdouble total_seconds = 0.0;
/* randomly colour each pixel */
static void
fill_pixbuf (GdkPixbuf *buf)
{
int width, height, rowstride, n_channels;
int x,y,n;
guchar *pixels, *p;
g_assert (gdk_pixbuf_get_bits_per_sample (buf) == 8);
n_channels = gdk_pixbuf_get_n_channels (buf);
width = gdk_pixbuf_get_width (buf);
height = gdk_pixbuf_get_height (buf);
rowstride = gdk_pixbuf_get_rowstride (buf);
pixels = gdk_pixbuf_get_pixels (buf);
for (x=0; x<width; x++) {
for (y=0; y<height; y++) {
p = pixels + (y*rowstride) + (x*n_channels);
for (n=0; n<n_channels; n++) {
p[n] = (random()*255)/RAND_MAX;
}
}
}
}
int
main (int argc, char **argv)
{
GTimer *timer;
int i,j;
gtk_init (&argc, &argv);
GdkPixbuf *pixbuf[4], *ret;
pixbuf[0] = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 400, 600);
pixbuf[1] = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 40, 60);
pixbuf[2] = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 400, 600);
pixbuf[3] = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 40, 60);
for (j=0; j<4; j++)
fill_pixbuf (pixbuf[j]);
timer = g_timer_new ();
g_timer_start (timer);
for (i = 0; i < 10 ; i++) {
for (j=0; j<4; j++) {
ret = gdk_pixbuf_scale_simple (pixbuf[j], 700, 900, GDK_INTERP_BILINEAR);
gdk_pixbuf_unref (ret);
ret = gdk_pixbuf_scale_simple (pixbuf[j], 20, 50, GDK_INTERP_BILINEAR);
gdk_pixbuf_unref (ret);
}
}
g_timer_stop (timer);
total_seconds += g_timer_elapsed (timer, NULL);
g_print ("time spent scaling (in seconds): %lf\n", total_seconds );
return 0;
}
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