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/*
Copyright (C) 2000 Paul Wilkins
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* viewer.c by Paul Wilkins 1/2/2000 */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/shape.h>
#include <Imlib.h>
int
main(int argc, char **argv)
{
Display *disp;
ImlibData *id;
XSetWindowAttributes attr;
Window win;
ImlibImage *im;
Pixmap p, m;
int w, h;
/* Be nice and tell the user if they don't, to provide a file as an arg */
if (argc <= 1) {
printf("Usage:\n %s image_file\n", argv[0]);
exit(1);
}
/* Connect to the default Xserver */
disp = XOpenDisplay(NULL);
/* Immediately afterwards Intitialise Imlib */
id = Imlib_init(disp);
/* Load the image specified as the first argument */
im = Imlib_load_image(id, argv[1]);
/* Suck the image's original width and height out of the Image structure */
w = im->rgb_width;
h = im->rgb_height;
/* Create a Window to display in */
win = XCreateWindow(disp, DefaultRootWindow(disp), 0, 0, w, h, 0, id->x.depth,
InputOutput, id->x.visual, 0, &attr);
XSelectInput(disp, win, StructureNotifyMask);
/* Render the original 24-bit Image data into a pixmap of size w * h */
Imlib_render(id, im, w, h);
/* Extract the Image and mask pixmaps from the Image */
p = Imlib_move_image(id, im);
/* The mask will be 0 if the image has no transparency */
m = Imlib_move_mask(id, im);
/* Put the Image pixmap in the background of the window */
XSetWindowBackgroundPixmap(disp, win, p);
/* If there was a mask to the image, set the Image's mask to it */
if (m)
XShapeCombineMask(disp, win, ShapeBounding, 0, 0, m, ShapeSet);
/* Actually display the window */
XMapWindow(disp, win);
/* Synchronise with the Xserver */
XSync(disp, False);
/* Event loop to handle resizes */
for (;;) {
XEvent ev;
/* Sit and wait for an event to happen */
XNextEvent(disp, &ev);
if (ev.type == ConfigureNotify) {
w = ev.xconfigure.width;
h = ev.xconfigure.height;
/* Re-render the Image to the new size */
Imlib_render(id, im, w, h);
/* Free the previous pixmap used for the window - note ONLY the
pixmap is */
/* freed - the mask is marked automatically to be freed along with
the */
/* pixmap. There is no need to free it as well - in fact it is
advised you do */
/* not. You must use the Imlib free function because of Imlib's
caching. Do */
/* not use any other free functions. You can use this function for
Pixmaps */
/* not created by Imlib - and it will just go free them as expected.
*/
Imlib_free_pixmap(id, p);
p = Imlib_move_image(id, im);
/* The mask will be 0 if the image has no transparency */
m = Imlib_move_mask(id, im);
/* Put the Image pixmap in the background of the window */
XSetWindowBackgroundPixmap(disp, win, p);
/* If there was a mask to the image, set the Image's mask to it */
if (m)
XShapeCombineMask(disp, win, ShapeBounding, 0, 0, m, ShapeSet);
/* Clear the window to update the background change */
XClearWindow(disp, win);
/* Synchronise with the Xserver */
XSync(disp, False);
}
}
}
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