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cairo/doc/tutorial/src/include/cairo-tutorial-xlib.h
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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); | |
} | |
} | |
} |