364 lines
11 KiB
C
364 lines
11 KiB
C
/***********************************************************************/
|
|
/* */
|
|
/* Objective Caml */
|
|
/* */
|
|
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
|
|
/* */
|
|
/* Copyright 1996 Institut National de Recherche en Informatique et */
|
|
/* en Automatique. All rights reserved. This file is distributed */
|
|
/* under the terms of the GNU Library General Public License. */
|
|
/* */
|
|
/***********************************************************************/
|
|
|
|
/* $Id$ */
|
|
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include "libgraph.h"
|
|
#include <alloc.h>
|
|
#include <callback.h>
|
|
#include <fail.h>
|
|
#include <memory.h>
|
|
#ifdef HAS_SETITIMER
|
|
#include <sys/time.h>
|
|
#endif
|
|
|
|
Display * grdisplay = NULL;
|
|
int grscreen;
|
|
Colormap grcolormap;
|
|
int grwhite, grblack;
|
|
struct canvas grwindow;
|
|
struct canvas grbstore;
|
|
int grx, gry;
|
|
unsigned long grcolor;
|
|
extern XFontStruct * grfont;
|
|
|
|
static Bool gr_initialized = False;
|
|
|
|
static int gr_error_handler(Display *display, XErrorEvent *error);
|
|
static int gr_ioerror_handler(Display *display);
|
|
value gr_clear_graph(void);
|
|
|
|
value gr_open_graph(value arg)
|
|
{
|
|
char display_name[64], geometry_spec[64];
|
|
char * p, * q;
|
|
XSizeHints hints;
|
|
int ret;
|
|
XEvent event;
|
|
int x, y, w, h;
|
|
XWindowAttributes attributes;
|
|
|
|
if (gr_initialized) {
|
|
gr_clear_graph();
|
|
} else {
|
|
|
|
/* Parse the argument */
|
|
for (p = String_val(arg), q = display_name; *p != 0 && *p != ' '; p++)
|
|
if (q < display_name + sizeof(display_name) - 1) *q++ = *p;
|
|
*q = 0;
|
|
while (*p == ' ') p++;
|
|
for (q = geometry_spec; *p != 0; p++)
|
|
if (q < geometry_spec + sizeof(geometry_spec) - 1) *q++ = *p;
|
|
*q = 0;
|
|
|
|
/* Open the display */
|
|
if (grdisplay == NULL) {
|
|
grdisplay = XOpenDisplay(display_name);
|
|
if (grdisplay == NULL)
|
|
gr_fail("Cannot open display %s", XDisplayName(display_name));
|
|
grscreen = DefaultScreen(grdisplay);
|
|
grblack = BlackPixel(grdisplay, grscreen);
|
|
grwhite = WhitePixel(grdisplay, grscreen);
|
|
grcolormap = DefaultColormap(grdisplay, grscreen);
|
|
}
|
|
|
|
/* Set up the error handlers */
|
|
XSetErrorHandler(gr_error_handler);
|
|
XSetIOErrorHandler(gr_ioerror_handler);
|
|
|
|
/* Parse the geometry specification */
|
|
hints.x = 0;
|
|
hints.y = 0;
|
|
hints.width = DEFAULT_SCREEN_WIDTH;
|
|
hints.height = DEFAULT_SCREEN_HEIGHT;
|
|
hints.flags = PPosition | PSize;
|
|
hints.win_gravity = 0;
|
|
|
|
ret = XWMGeometry(grdisplay, grscreen, geometry_spec, "", BORDER_WIDTH,
|
|
&hints, &x, &y, &w, &h, &hints.win_gravity);
|
|
if (ret & (XValue | YValue)) {
|
|
hints.x = x; hints.y = y; hints.flags |= USPosition;
|
|
}
|
|
if (ret & (WidthValue | HeightValue)) {
|
|
hints.width = w; hints.height = h; hints.flags |= USSize;
|
|
}
|
|
|
|
/* Initial drawing color is black */
|
|
grcolor = grblack;
|
|
|
|
/* Create the on-screen window */
|
|
grwindow.w = hints.width;
|
|
grwindow.h = hints.height;
|
|
grwindow.win =
|
|
XCreateSimpleWindow(grdisplay, DefaultRootWindow(grdisplay),
|
|
hints.x, hints.y, hints.width, hints.height,
|
|
BORDER_WIDTH, grblack, grwhite);
|
|
XSetStandardProperties(grdisplay, grwindow.win, WINDOW_NAME, ICON_NAME,
|
|
None, NULL, 0, &hints);
|
|
grwindow.gc = XCreateGC(grdisplay, grwindow.win, 0, NULL);
|
|
XSetBackground(grdisplay, grwindow.gc, grwhite);
|
|
XSetForeground(grdisplay, grwindow.gc, grcolor);
|
|
|
|
/* Require exposure, resize and keyboard events */
|
|
XSelectInput(grdisplay, grwindow.win, DEFAULT_EVENT_MASK);
|
|
|
|
/* Map the window on the screen and wait for the first Expose event */
|
|
XMapWindow(grdisplay, grwindow.win);
|
|
do { XNextEvent(grdisplay, &event); } while (event.type != Expose);
|
|
|
|
/* Get the actual window dimensions */
|
|
|
|
XGetWindowAttributes(grdisplay, grwindow.win, &attributes);
|
|
grwindow.w = attributes.width;
|
|
grwindow.h = attributes.height;
|
|
|
|
/* Create the pixmap used for backing store */
|
|
grbstore.w = grwindow.w;
|
|
grbstore.h = grwindow.h;
|
|
grbstore.win =
|
|
XCreatePixmap(grdisplay, grwindow.win, grbstore.w, grbstore.h,
|
|
XDefaultDepth(grdisplay, grscreen));
|
|
grbstore.gc = XCreateGC(grdisplay, grbstore.win, 0, NULL);
|
|
XSetBackground(grdisplay, grbstore.gc, grwhite);
|
|
|
|
/* Clear the pixmap */
|
|
XSetForeground(grdisplay, grbstore.gc, grwhite);
|
|
XFillRectangle(grdisplay, grbstore.win, grbstore.gc,
|
|
0, 0, grbstore.w, grbstore.h);
|
|
XSetForeground(grdisplay, grbstore.gc, grcolor);
|
|
|
|
/* The global data structures are now correctly initialized.
|
|
In particular, gr_sigio_handler can now handle events safely. */
|
|
gr_initialized = True;
|
|
|
|
/* If possible, request that system calls be restarted after
|
|
the EVENT_SIGNAL signal. */
|
|
#ifdef POSIX_SIGNALS
|
|
#ifdef SA_RESTART
|
|
{ struct sigaction action;
|
|
sigaction(EVENT_SIGNAL, NULL, &action);
|
|
action.sa_flags |= SA_RESTART;
|
|
sigaction(EVENT_SIGNAL, &action, NULL);
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef USE_ASYNC_IO
|
|
/* If BSD-style asynchronous I/O are supported:
|
|
arrange for I/O on the connection to trigger the SIGIO signal */
|
|
ret = fcntl(ConnectionNumber(grdisplay), F_GETFL, 0);
|
|
fcntl(ConnectionNumber(grdisplay), F_SETFL, ret | FASYNC);
|
|
fcntl(ConnectionNumber(grdisplay), F_SETOWN, getpid());
|
|
#endif
|
|
}
|
|
#ifdef USE_INTERVAL_TIMER
|
|
/* If BSD-style interval timers are provided, use the real-time timer
|
|
to poll events. */
|
|
{ struct itimerval it;
|
|
it.it_interval.tv_sec = 0;
|
|
it.it_interval.tv_usec = 250000;
|
|
it.it_value.tv_sec = 0;
|
|
it.it_value.tv_usec = 250000;
|
|
setitimer(ITIMER_REAL, &it, NULL);
|
|
}
|
|
#endif
|
|
#ifdef USE_ALARM
|
|
/* The poor man's solution: use alarm to poll events. */
|
|
alarm(1);
|
|
#endif
|
|
/* Position the current point at origin */
|
|
grx = 0;
|
|
gry = 0;
|
|
/* Reset the color cache */
|
|
gr_init_color_cache();
|
|
return Val_unit;
|
|
}
|
|
|
|
value gr_close_graph(void)
|
|
{
|
|
if (gr_initialized) {
|
|
#ifdef USE_INTERVAL_TIMER
|
|
struct itimerval it;
|
|
it.it_value.tv_sec = 0;
|
|
it.it_value.tv_usec = 0;
|
|
setitimer(ITIMER_REAL, &it, NULL);
|
|
#endif
|
|
gr_initialized = False;
|
|
if (grfont != NULL) { XFreeFont(grdisplay, grfont); grfont = NULL; }
|
|
XFreeGC(grdisplay, grwindow.gc);
|
|
XDestroyWindow(grdisplay, grwindow.win);
|
|
XFreeGC(grdisplay, grbstore.gc);
|
|
XFreePixmap(grdisplay, grbstore.win);
|
|
XFlush(grdisplay);
|
|
}
|
|
return Val_unit;
|
|
}
|
|
|
|
value gr_clear_graph(void)
|
|
{
|
|
gr_check_open();
|
|
XSetForeground(grdisplay, grwindow.gc, grwhite);
|
|
XFillRectangle(grdisplay, grwindow.win, grwindow.gc,
|
|
0, 0, grwindow.w, grwindow.h);
|
|
XSetForeground(grdisplay, grwindow.gc, grcolor);
|
|
XSetForeground(grdisplay, grbstore.gc, grwhite);
|
|
XFillRectangle(grdisplay, grbstore.win, grbstore.gc,
|
|
0, 0, grbstore.w, grbstore.h);
|
|
XSetForeground(grdisplay, grbstore.gc, grcolor);
|
|
XFlush(grdisplay);
|
|
gr_init_color_cache();
|
|
return Val_unit;
|
|
}
|
|
|
|
value gr_size_x(void)
|
|
{
|
|
gr_check_open();
|
|
return Val_int(grwindow.w);
|
|
}
|
|
|
|
value gr_size_y(void)
|
|
{
|
|
gr_check_open();
|
|
return Val_int(grwindow.h);
|
|
}
|
|
|
|
/* The gr_sigio_handler is called via the signal machinery in the bytecode
|
|
interpreter. The signal system ensures that this function will be
|
|
called either between two bytecode instructions, or during a blocking
|
|
primitive. In either case, not in the middle of an Xlib call.
|
|
(There is no blocking primitives in this library, not even
|
|
wait_next_event, for various reasons.) */
|
|
|
|
void gr_handle_simple_event(XEvent *e);
|
|
|
|
value gr_sigio_signal(value unit)
|
|
{
|
|
return Val_int(EVENT_SIGNAL);
|
|
}
|
|
|
|
value gr_sigio_handler(void)
|
|
{
|
|
XEvent grevent;
|
|
|
|
if (gr_initialized) {
|
|
while (XCheckMaskEvent(grdisplay, -1 /*all events*/, &grevent))
|
|
gr_handle_simple_event(&grevent);
|
|
}
|
|
#ifdef USE_ALARM
|
|
alarm(1);
|
|
#endif
|
|
return Val_unit;
|
|
}
|
|
|
|
void gr_handle_simple_event(XEvent *e)
|
|
{
|
|
switch (e->type) {
|
|
|
|
case Expose:
|
|
XCopyArea(grdisplay, grbstore.win, grwindow.win, grwindow.gc,
|
|
e->xexpose.x, e->xexpose.y + grbstore.h - grwindow.h,
|
|
e->xexpose.width, e->xexpose.height,
|
|
e->xexpose.x, e->xexpose.y);
|
|
XFlush(grdisplay);
|
|
break;
|
|
|
|
case ConfigureNotify:
|
|
grwindow.w = e->xconfigure.width;
|
|
grwindow.h = e->xconfigure.height;
|
|
if (grwindow.w > grbstore.w || grwindow.h > grbstore.h) {
|
|
|
|
/* Allocate a new backing store large enough to accomodate
|
|
both the old backing store and the current window. */
|
|
struct canvas newbstore;
|
|
newbstore.w = max(grwindow.w, grbstore.w);
|
|
newbstore.h = max(grwindow.h, grbstore.h);
|
|
newbstore.win =
|
|
XCreatePixmap(grdisplay, grwindow.win, newbstore.w, newbstore.h,
|
|
XDefaultDepth(grdisplay, grscreen));
|
|
newbstore.gc = XCreateGC(grdisplay, newbstore.win, 0, NULL);
|
|
XSetBackground(grdisplay, newbstore.gc, grwhite);
|
|
XSetForeground(grdisplay, newbstore.gc, grwhite);
|
|
XFillRectangle(grdisplay, newbstore.win, newbstore.gc,
|
|
0, 0, newbstore.w, newbstore.h);
|
|
XSetForeground(grdisplay, newbstore.gc, grcolor);
|
|
if (grfont != NULL)
|
|
XSetFont(grdisplay, newbstore.gc, grfont->fid);
|
|
|
|
/* Copy the old backing store into the new one */
|
|
XCopyArea(grdisplay, grbstore.win, newbstore.win, newbstore.gc,
|
|
0, 0, grbstore.w, grbstore.h, 0, newbstore.h - grbstore.h);
|
|
|
|
/* Free the old backing store */
|
|
XFreeGC(grdisplay, grbstore.gc);
|
|
XFreePixmap(grdisplay, grbstore.win);
|
|
|
|
/* Use the new backing store */
|
|
grbstore = newbstore;
|
|
XFlush(grdisplay);
|
|
}
|
|
break;
|
|
|
|
case MappingNotify:
|
|
XRefreshKeyboardMapping(&(e->xmapping));
|
|
break;
|
|
|
|
case KeyPress:
|
|
{ KeySym thekey;
|
|
char keytxt[256];
|
|
int nchars;
|
|
char * p;
|
|
nchars = XLookupString(&(e->xkey), keytxt, sizeof(keytxt), &thekey, 0);
|
|
for (p = keytxt; nchars > 0; p++, nchars--) gr_enqueue_char(*p);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Processing of graphic errors */
|
|
|
|
static value * graphic_failure_exn = NULL;
|
|
|
|
void gr_fail(char *fmt, char *arg)
|
|
{
|
|
char buffer[1024];
|
|
|
|
if (graphic_failure_exn == NULL) {
|
|
graphic_failure_exn = caml_named_value("Graphics.Graphic_failure");
|
|
if (graphic_failure_exn == NULL)
|
|
invalid_argument("Exception Graphics.Graphic_failure not initialized, must link graphics.cma");
|
|
}
|
|
sprintf(buffer, fmt, arg);
|
|
raise_with_string(*graphic_failure_exn, buffer);
|
|
}
|
|
|
|
void gr_check_open(void)
|
|
{
|
|
if (!gr_initialized) gr_fail("graphic screen not opened", NULL);
|
|
}
|
|
|
|
static int gr_error_handler(Display *display, XErrorEvent *error)
|
|
{
|
|
char errmsg[512];
|
|
XGetErrorText(error->display, error->error_code, errmsg, sizeof(errmsg));
|
|
gr_fail("Xlib error: %s", errmsg);
|
|
return 0;
|
|
}
|
|
|
|
static int gr_ioerror_handler(Display *display)
|
|
{
|
|
gr_fail("fatal I/O error", NULL);
|
|
return 0;
|
|
}
|
|
|