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/* cairo-tutorial-xlib.h - a tutorial framework for cairo with xlib
*
* Copyright © 2005, Keith Packard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <strings.h>
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <cairo.h>
#include <cairo-xlib.h>
#ifndef WIDTH
#define WIDTH 400
#endif
#ifndef HEIGHT
#define HEIGHT 400
#endif
#ifndef DEFAULT_VISUAL
#define DEFAULT_VISUAL 0
#endif
static void
Usage (char *program)
{
fprintf (stderr, "Usage: %s\n", program);
fprintf (stderr, "\t-display <display-name>\n");
fprintf (stderr, "\t-geometry <geometry>\n");
exit (1);
}
char *dpy_name;
VisualID vid = DEFAULT_VISUAL;
Colormap colormap;
Visual *visual;
int depth;
unsigned int width = WIDTH, height = HEIGHT;
Window win;
Pixmap pix;
GC gc;
static void
draw (cairo_t *cr, int width, int height);
static void
draw_to_pixmap (Display *dpy, Pixmap pix)
{
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_xlib_surface_create (dpy, pix, visual,
width, height);
cr = cairo_create (surface);
draw (cr, width, height);
cairo_destroy (cr);
cairo_surface_destroy (surface);
}
static void
handle_configure (Display *dpy, XConfigureEvent *cev)
{
width = cev->width;
height = cev->height;
XFreePixmap(dpy, pix);
pix = XCreatePixmap(dpy, win, width, height, depth);
XFillRectangle(dpy, pix, gc, 0, 0, width, height);
draw_to_pixmap (dpy, pix);
}
static void
handle_expose (Display *dpy, XExposeEvent *eev)
{
XCopyArea (dpy, pix, win, gc,
eev->x, eev->y,
eev->width, eev->height,
eev->x, eev->y);
}
int
main (argc, argv)
int argc;
char **argv;
{
Display *dpy;
Window root = 0;
char **init_argv = argv;
XSetWindowAttributes attr;
int scr;
int x = 0, y = 0;
int geometryMask;
int border_width = 1;
XSizeHints sizeHints;
XWMHints wmHints;
XClassHint classHints;
XEvent ev;
XEvent eev;
int HasExpose = 0;
int sync = 0;
XTextProperty wm_name, icon_name;
Atom wm_delete_window;
unsigned long gc_mask;
XGCValues gcv;
char quit_string[10];
unsigned long window_mask;
int has_colormap = 0;
wm_name.value = (unsigned char *) argv[0];
wm_name.encoding = XA_STRING;
wm_name.format = 8;
wm_name.nitems = strlen (argv[0]) + 1;
icon_name = wm_name;
gc_mask = 0;
while (*++argv) {
if (!strcmp (*argv, "-display"))
dpy_name = *++argv;
else if (!strcmp (*argv, "-visual"))
vid = strtol(*++argv, NULL, 0);
else if (!strcmp (*argv, "-geometry"))
geometryMask = XParseGeometry (*++argv, &x, &y, &width, &height);
else if (!strcmp (*argv, "-sync"))
sync = 1;
else if (!strcmp (*argv, "-bw"))
border_width = strtol(*++argv, NULL, 0);
else if (!strcmp (*argv, "-root"))
root = strtol (*++argv, NULL, 0);
else
Usage (*init_argv);
}
sizeHints.flags = 0;
wmHints.flags = InputHint;
wmHints.input = True;
classHints.res_name = init_argv[0];
classHints.res_class = init_argv[0];
dpy = XOpenDisplay (dpy_name);
if (!dpy) {
fprintf (stderr, "Error: failed to open display: %s\n",
XDisplayName (dpy_name));
exit (1);
}
if (sync)
XSynchronize (dpy, sync);
scr = DefaultScreen (dpy);
if (!root)
root = RootWindow (dpy, scr);
window_mask = CWBackPixel|CWBorderPixel|CWEventMask;
if (!has_colormap)
colormap = DefaultColormap (dpy, scr);
else
{
window_mask |= CWColormap;
attr.colormap = colormap;
}
visual = DefaultVisual (dpy, scr);
depth = DefaultDepth (dpy, scr);
if (vid)
{
XVisualInfo vi, *vi_ret;
int n;
vi.visualid = vid;
vi.screen = scr;
vi_ret = XGetVisualInfo (dpy, VisualIDMask|VisualScreenMask,
&vi, &n);
if (vi_ret)
{
visual = vi_ret->visual;
if (!has_colormap)
{
colormap = XCreateColormap (dpy, root, visual, AllocNone);
window_mask |= CWColormap;
attr.colormap = colormap;
}
depth = vi_ret->depth;
}
}
attr.background_pixel = WhitePixel (dpy, scr);
attr.border_pixel = 0;
attr.event_mask = ExposureMask|KeyPressMask|KeyReleaseMask|StructureNotifyMask;
wm_delete_window = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
win = XCreateWindow (dpy, root, x, y, width, height, border_width,
depth, InputOutput,
visual,
window_mask,
&attr);
pix = XCreatePixmap (dpy, win, width, height, depth);
gcv.foreground = WhitePixel (dpy, scr);
gc = XCreateGC (dpy, pix, GCForeground, &gcv);
XFillRectangle(dpy, pix, gc, 0, 0, width, height);
draw_to_pixmap (dpy, pix);
XSetWMProperties (dpy, win,
&wm_name, &icon_name,
init_argv, argc,
&sizeHints, &wmHints, 0);
XSetWMProtocols (dpy, win, &wm_delete_window, 1);
XMapWindow (dpy, win);
for (;;) {
XNextEvent (dpy, &ev);
if (HasExpose && ev.type != Expose) {
HasExpose = 0;
handle_expose (dpy, &eev.xexpose);
}
switch (ev.type) {
case ConfigureNotify:
handle_configure (dpy, &ev.xconfigure);
break;
case Expose:
if (QLength(dpy)) {
eev = ev;
HasExpose = 1;
} else if (ev.xexpose.count == 0) {
handle_expose (dpy, &ev.xexpose);
}
break;
case KeyPress:
if (XLookupString ((XKeyEvent *) &ev, quit_string, sizeof (quit_string), 0, 0) == 1) {
switch (quit_string[0]) {
case 'q':
exit (0);
case 'c':
XClearArea (dpy, ev.xkey.window, 0, 0, 0, 0, True);
break;
}
}
break;
case ClientMessage:
exit (0);
}
}
}
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