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/*
pspresent: PostScript presentation tool
gs.c: Interface to Ghostscript
Copyright (C) Matthew Chapman 2001-2003
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pspresent.h"
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <X11/Xatom.h>
extern Display *display;
extern Screen *screen;
static Window gs_wnd;
static pid_t gs_pid;
static Atom next, page, done;
static void GSExec(int gs_stdin, Window wnd)
{
char *args[] = { "gs", "-sDEVICE=x11alpha", "-q", "-dNOPAUSE", "-dSAFER", "-", NULL };
char ghostview[32];
snprintf(ghostview, sizeof(ghostview)-1, "GHOSTVIEW=%ld",
(unsigned long)wnd);
putenv(ghostview);
dup2(gs_stdin, STDIN_FILENO);
execvp(args[0], args);
perror(args[0]);
}
/* set Ghostscript-related properties on a window */
int GSStart(Window draw_wnd, Pixmap draw_pix, int wnd_width, int wnd_height, int bounds[4], int orientation)
{
Atom gv, gv_colors;
unsigned long fg, bg;
float xdpi, ydpi;
int xsize, ysize;
char prop[64];
int fds[2];
int flags, len, gs_fd;
fg = BlackPixelOfScreen(screen);
bg = WhitePixelOfScreen(screen);
if (orientation % 180 == 0)
{
xsize = bounds[2]-bounds[0];
ysize = bounds[3]-bounds[1];
}
else
{
xsize = bounds[3]-bounds[1];
ysize = bounds[2]-bounds[0];
}
xdpi = 72.0*wnd_width/xsize;
ydpi = 72.0*wnd_height/ysize;
gv = XInternAtom(display, "GHOSTVIEW", False);
len = snprintf(prop, sizeof(prop)-1, "%ld %d %d %d %d %d %g %g %d %d %d %d",
draw_pix, orientation, bounds[0], bounds[1], bounds[2], bounds[3], xdpi, ydpi, 0, 0, 0, 0);
XChangeProperty(display, draw_wnd, gv, XA_STRING, 8, PropModeReplace,
prop, len);
gv_colors = XInternAtom(display, "GHOSTVIEW_COLORS", False);
len = snprintf(prop, sizeof(prop)-1, "Color %ld %ld", fg, bg);
XChangeProperty(display, draw_wnd, gv_colors, XA_STRING, 8, PropModeReplace,
prop, len);
next = XInternAtom(display, "NEXT", False);
page = XInternAtom(display, "PAGE", False);
done = XInternAtom(display, "DONE", False);
pipe(fds);
switch (gs_pid = fork())
{
case -1: /* failure */
perror("fork");
return -1;
case 0: /* child */
GSExec(fds[0], draw_wnd);
exit(1);
}
flags = fcntl(fds[1], F_GETFL);
fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
gs_fd = fds[1];
return gs_fd;
}
char *GSWrite(int gs_fd, char *start, char *end)
{
int length;
while (start < end)
{
length = end - start;
length = write(gs_fd, start, length);
if (length == -1)
{
if (errno != EWOULDBLOCK)
perror("write");
break;
}
start += length;
}
return start;
}
void GSStop(int gs_fd)
{
int status;
close(gs_fd);
kill(gs_pid, SIGTERM);
waitpid(gs_pid, &status, 0);
}
void GSNextPage(void)
{
XEvent event;
event.xclient.type = ClientMessage;
event.xclient.display = display;
event.xclient.window = gs_wnd;
event.xclient.message_type = next;
event.xclient.format = 32;
XSendEvent(display, gs_wnd, False, 0, &event);
XFlush(display);
}
Bool GSProcessMessage(XClientMessageEvent *message)
{
gs_wnd = (Window)message->data.l[0];
return (message->message_type == page);
}
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