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/*
* display.c:
* Display images gathered by driftnet.
*
* Copyright (c) 2001 Chris Lightfoot. All rights reserved.
* Email: chris@ex-parrot.com; WWW: http://www.ex-parrot.com/~chris/
*
*/
static const char rcsid[] = "$Id: display.c,v 1.6 2001/08/08 19:49:15 chris Exp $";
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "driftnet.h"
#include "img.h"
/* The border, in pixels, around images displayed in the window. */
#define BORDER 6
extern int verbose; /* in driftnet.c */
static GtkWidget *window, *darea;
static int width, height, wrx, wry, rowheight;
static img backing_image;
gint delete_event(GtkWidget *widget, GdkEvent *event, gpointer data) {
if (verbose)
fprintf(stderr, PROGNAME ": display child shutting down\n");
return FALSE; /* do destroy window */
}
void make_backing_image() {
img I;
I = img_new_blank(width, height);
img_alloc(I);
if (backing_image) {
int w2, h2;
/* Copy old contents of backing image to ll corner of new one. */
w2 = backing_image->width;
if (w2 > width) w2 = width;
h2 = backing_image->height;
if (h2 > height) h2 = height;
img_simple_blt(I, 0, height - h2, backing_image, 0, backing_image->height - h2, w2, h2);
/* Adjust placement of new images. */
if (wrx >= w2) wrx = w2;
img_delete(backing_image);
}
backing_image = I;
wrx = BORDER;
wry = height - BORDER;
rowheight = 2 * BORDER;
}
void update_window() {
if (backing_image) {
GdkGC *gc = gdk_gc_new(darea->window);
gdk_draw_rgb_32_image(darea->window, gc, 0, 0, width, height, GDK_RGB_DITHER_NORMAL, (guchar*)backing_image->flat, sizeof(pel) * width);
gdk_gc_destroy(gc);
}
}
void scroll_backing_image(const int dy) {
pel **row1, **row2;
for (row1 = backing_image->data, row2 = backing_image->data + dy;
row2 < backing_image->data + height; ++row1, ++row2)
memcpy(*row1, *row2, width * sizeof(pel));
for (row2 = row1; row2 < backing_image->data + height; ++row2)
memset(*row2, 0, width * sizeof(pel));
}
void expose_event(GtkWidget *widget, GdkEvent *event, gpointer data) {
gdk_window_get_size(darea->window, &width, &height);
if (!backing_image || backing_image->width != width || backing_image->height != height)
make_backing_image();
update_window();
}
void configure_event(GtkWidget *widget, GdkEvent *event, gpointer data) {
gdk_window_get_size(darea->window, &width, &height);
if (!backing_image || backing_image->width != width || backing_image->height != height)
make_backing_image();
update_window();
}
void destroy(GtkWidget *widget, gpointer data) {
gtk_main_quit();
}
extern int dpychld_fd; /* in driftnet.c */
gboolean pipe_event(GIOChannel chan, GIOCondition cond, gpointer data) {
struct pipemsg m = {0};
ssize_t rr;
while ((rr = read(dpychld_fd, &m, sizeof(m))) == sizeof(m)) {
if (verbose)
fprintf(stderr, PROGNAME": received image %s of size %d\n", m.filename, m.len);
/* checks to see whether this looks like an image we're interested in. */
if (m.len > 256) {
/* small images are probably bollocks. */
img i = img_new();
if (!img_load_file(i, m.filename, header, unknown))
fprintf(stderr, PROGNAME": %s: bogus image (err = %d)\n", m.filename, i->err);
else {
if (i->width > 8 && i->height > 8) {
if (img_load(i, full, i->type)) {
/* slot in the new image at some plausible place. */
int w, h;
if (i->width > width - 2 * BORDER) w = width - 2 * BORDER;
else w = i->width;
if (i->height > height - 2 * BORDER) h = height - 2 * BORDER;
else h = i->height;
/* is there space on this row? */
if (width - wrx < w) {
/* no */
scroll_backing_image(h + BORDER);
wrx = BORDER;
rowheight = h + BORDER;
}
if (rowheight < h + BORDER) {
scroll_backing_image(h + BORDER - rowheight);
rowheight = h + BORDER;
}
img_simple_blt(backing_image, wrx, wry - h, i, 0, 0, w, h);
update_window();
wrx += w + BORDER;
} else fprintf(stderr, PROGNAME": %s: bogus image (err = %d)\n", m.filename, i->err);
} else if (verbose) fprintf(stderr, PROGNAME": %s: image dimensions (%d x %d) too small to bother with\n", m.filename, i->width, i->height);
}
img_delete(i);
} else if (verbose) fprintf(stderr, PROGNAME": image data too small (%d bytes) to bother with\n", (int)m.len);
unlink(m.filename);
}
if (rr == -1 && errno != EINTR && errno != EAGAIN) {
perror(PROGNAME": read");
gtk_main_quit();
} else if (rr == 0) {
gtk_main_quit();
}
return TRUE;
}
int dodisplay(int argc, char *argv[]) {
GIOChannel *chan;
/* have our main loop poll the pipe file descriptor */
chan = g_io_channel_unix_new(dpychld_fd);
g_io_add_watch(chan, G_IO_IN | G_IO_ERR | G_IO_HUP, (GIOFunc)pipe_event, NULL);
fcntl(dpychld_fd, F_SETFL, O_NONBLOCK);
/* do some init thing */
gtk_init(&argc, &argv);
gdk_rgb_init();
gtk_widget_set_default_colormap(gdk_rgb_get_cmap());
gtk_widget_set_default_visual(gdk_rgb_get_visual());
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_usize(window, 0, 0);
darea = gtk_drawing_area_new();
gtk_container_add(GTK_CONTAINER(window), darea);
gtk_widget_set_events(darea, GDK_EXPOSURE_MASK);
gtk_signal_connect(GTK_OBJECT(window), "delete_event", GTK_SIGNAL_FUNC(delete_event), NULL);
gtk_signal_connect(GTK_OBJECT(window), "destroy", GTK_SIGNAL_FUNC(destroy), NULL);
gtk_signal_connect(GTK_OBJECT(darea), "expose-event", GTK_SIGNAL_FUNC(expose_event), NULL);
gtk_signal_connect(GTK_OBJECT(darea), "configure_event", GTK_SIGNAL_FUNC(expose_event), NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
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