[code]#include <X11/Xlib.h>
#include <Imlib2.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
Display *display;
XWindowAttributes windowattr;
Imlib_Image image;
Imlib_Image icon;
int windowid, thumbwidth, thumbheight;
char *imageformat, *imagepath;
char *iconformat, *iconpath;
int w, h;
if ( argc != 5 ) {
puts("Usage: thumb WindowId ThumbWidth ThumbFile IconFile");
return 1;
}
sscanf(argv[1], “%x”, &windowid);
sscanf(argv[2], “%d”, &thumbwidth);
imagepath = argv[3];
imageformat = strrchr(argv[3], ‘.’);
iconpath = argv[4];
iconformat = strrchr(argv[4], ‘.’);
if ( (display = XOpenDisplay(NULL)) == NULL ) return 1;
XGetWindowAttributes(display, windowid, &windowattr);
thumbheight = (int)((float)windowattr.height / ((float)windowattr.width/(float)thumbwidth));
imlib_context_set_anti_alias(1);
imlib_context_set_display(display);
imlib_context_set_visual(DefaultVisual(display, DefaultScreen(display)));
imlib_context_set_colormap(DefaultColormap(display, DefaultScreen(display)));
imlib_context_set_drawable(windowid);
if ( 4*thumbwidth >= windowattr.width || 4*thumbheight >= windowattr.height ) {
image = imlib_create_image_from_drawable((Pixmap)0, 0, 0,
windowattr.width, windowattr.height, 1);
imlib_context_set_image(image);
image = imlib_create_cropped_scaled_image(0, 0, windowattr.width, windowattr.height,
thumbwidth, thumbheight);
} else {
image = imlib_create_scaled_image_from_drawable((Pixmap)0, 0, 0,
windowattr.width, windowattr.height, 4*thumbwidth, 4*thumbheight, 1, 1);
imlib_context_set_image(image);
image = imlib_create_cropped_scaled_image(0, 0, 4*thumbwidth, 4*thumbheight,
thumbwidth, thumbheight);
}
icon = imlib_load_image(argv[4]);
imlib_context_set_image(icon);
w = imlib_image_get_width();
h = imlib_image_get_height();
imlib_context_set_image(image);
imlib_blend_image_onto_image( icon, 0,
0, 0, w, h,
0, 0, w, h);
imlib_image_set_format(imageformat + 1);
imlib_save_image(argv[3]);
fprintf(stdout, “WindowStyle IconOverride, Icon %s\n”, argv[3]);
return 0;
} [/code]
this thumb function can have a window border like taviso thumb …convert -frame 1x1…
sorry for my bad english 
)
Ah, much neater than my hatchet job! Thanks, Sascha.