sent/sent.c

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C
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2014-06-23 00:39:21 +02:00
/* See LICENSE for licence details. */
#include <errno.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/keysym.h>
#include <X11/XKBlib.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "arg.h"
char *argv0;
/* macros */
#define LEN(a) (sizeof(a) / sizeof(a)[0])
#define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
typedef struct {
char* text;
} Slide;
/* Purely graphic info */
typedef struct {
Display *dpy;
Window win;
Atom wmdeletewin, netwmname;
Visual *vis;
XSetWindowAttributes attrs;
int scr;
int w, h;
} XWindow;
/* Drawing Context linked list*/
struct DC{
XFontStruct *font;
GC gc;
struct DC *next;
};
typedef union {
int i;
unsigned int ui;
float f;
const void *v;
} Arg;
typedef struct {
unsigned int b;
void (*func)(const Arg *);
const Arg arg;
} Mousekey;
typedef struct {
KeySym keysym;
void (*func)(const Arg *);
const Arg arg;
} Shortcut;
/* function definitions used in config.h */
static void advance(const Arg *);
static void quit(const Arg *);
/* config.h for applying patches and the configuration. */
#include "config.h"
static Bool xfontisscalable(char *name);
static XFontStruct *xloadqueryscalablefont(char *name, int size);
static struct DC *getfontsize(char *str, size_t len, int *width, int *height);
static void cleanup(struct DC *cur);
static void eprintf(const char *, ...);
static void load(FILE *fp);
static void advance(const Arg *arg);
static void quit(const Arg *arg);
static void run();
static void usage();
static void xdraw();
static void xhints();
static void xinit();
static void xloadfonts(char *);
static void bpress(XEvent *);
static void cmessage(XEvent *);
static void expose(XEvent *);
static void kpress(XEvent *);
static void resize(XEvent *);
/* Globals */
static Slide *slides = NULL;
static int idx = 0;
static int slidecount = 0;
static XWindow xw;
static struct DC dc;
static int running = 1;
static char *opt_font = NULL;
static void (*handler[LASTEvent])(XEvent *) = {
[ButtonPress] = bpress,
[ClientMessage] = cmessage,
[ConfigureNotify] = resize,
[Expose] = expose,
[KeyPress] = kpress,
};
Bool xfontisscalable(char *name)
{
int i, field;
if (!name || name[0] != '-')
return False;
for (i = field = 0; name[i] != '\0'; i++) {
if (name[i] == '-') {
field++;
if ((field == 7) || (field == 8) || (field == 12))
if ((name[i+1] != '0') || (name[i+2] != '-'))
return False;
}
}
return field == 14;
}
XFontStruct *xloadqueryscalablefont(char *name, int size)
{
int i, j, field;
char newname[500];
int resx, resy;
if (!name || name[0] != '-')
return NULL;
/* calculate our screen resolution in dots per inch. 25.4mm = 1 inch */
resx = DisplayWidth(xw.dpy, xw.scr)/(DisplayWidthMM(xw.dpy, xw.scr)/25.4);
resy = DisplayHeight(xw.dpy, xw.scr)/(DisplayHeightMM(xw.dpy, xw.scr)/25.4);
/* copy the font name, changing the scalable fields as we do so */
for (i = j = field = 0; name[i] != '\0' && field <= 14; i++) {
newname[j++] = name[i];
if (name[i] == '-') {
field++;
switch (field) {
case 7: /* pixel size */
case 12: /* average width */
/* change from "-0-" to "-*-" */
newname[j] = '*';
j++;
if (name[i+1] != '\0') i++;
break;
case 8: /* point size */
/* change from "-0-" to "-<size>-" */
sprintf(&newname[j], "%d", size);
while (newname[j] != '\0') j++;
if (name[i+1] != '\0') i++;
break;
case 9: /* x-resolution */
case 10: /* y-resolution */
/* change from an unspecified resolution to resx or resy */
sprintf(&newname[j], "%d", (field == 9) ? resx : resy);
while (newname[j] != '\0') j++;
while ((name[i+1] != '-') && (name[i+1] != '\0')) i++;
break;
}
}
}
newname[j] = '\0';
return (field != 14) ? NULL : XLoadQueryFont(xw.dpy, newname);
}
struct DC *getfontsize(char *str, size_t len, int *width, int *height)
{
XCharStruct info;
int unused;
struct DC *pre = &dc;
struct DC *cur = &dc;
do {
XTextExtents(cur->font, str, len, &unused, &unused, &unused, &info);
if (info.width > usablewidth * xw.w
|| info.ascent + info.descent > usableheight * xw.h)
break;
pre = cur;
} while ((cur = cur->next));
XTextExtents(pre->font, "o", 1, &unused, &unused, &unused, &info);
*height = info.ascent;
*width = XTextWidth(pre->font, str, len);
return pre;
}
void cleanup(struct DC *cur)
{
XFreeFont(xw.dpy, cur->font);
XFreeGC(xw.dpy, cur->gc);
if (cur->next) {
cleanup(cur->next);
cur->next = NULL;
}
if (cur != &dc) {
free(cur);
return;
}
XDestroyWindow(xw.dpy, xw.win);
XSync(xw.dpy, False);
XCloseDisplay(xw.dpy);
if (slides) {
free(slides);
slides = NULL;
}
}
void eprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[0] != '\0' && fmt[strlen(fmt)-1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
exit(EXIT_FAILURE);
}
void load(FILE *fp)
{
static size_t size = 0;
char buf[BUFSIZ], *p;
size_t i;
/* read each line from stdin and add it to the item list */
for (i = slidecount; fgets(buf, sizeof(buf), fp); i++) {
if ((i+1) * sizeof(*slides) >= size)
if (!(slides = realloc(slides, (size += BUFSIZ))))
eprintf("cannot realloc %u bytes:", size);
if ((p = strchr(buf, '\n')))
*p = '\0';
if (!(slides[i].text = strdup(buf)))
eprintf("cannot strdup %u bytes:", strlen(buf)+1);
}
if (slides)
slides[i].text = NULL;
slidecount = i;
}
void advance(const Arg *arg)
{
int new_idx = idx + arg->i;
LIMIT(new_idx, 0, slidecount-1);
if (new_idx != idx) {
idx = new_idx;
xdraw();
}
}
void quit(const Arg *arg)
{
running = 0;
}
void run()
{
XEvent ev;
/* Waiting for window mapping */
while (1) {
XNextEvent(xw.dpy, &ev);
if (ev.type == ConfigureNotify) {
xw.w = ev.xconfigure.width;
xw.h = ev.xconfigure.height;
} else if (ev.type == MapNotify) {
break;
}
}
while (running) {
XNextEvent(xw.dpy, &ev);
if (handler[ev.type])
(handler[ev.type])(&ev);
}
}
void usage()
{
eprintf("sent " VERSION " (c) 2014 markus.teich@stusta.mhn.de\n" \
"usage: sent [-f font] FILE1 [FILE2 ...]", argv0);
}
void xdraw()
{
int line_len = strlen(slides[idx].text);
int height;
int width;
struct DC *dc = getfontsize(slides[idx].text, line_len, &width, &height);
XClearWindow(xw.dpy, xw.win);
XDrawString(xw.dpy, xw.win, dc->gc, (xw.w - width)/2, (xw.h + height)/2,
slides[idx].text, line_len);
}
void xhints()
{
XClassHint class = {.res_name = "sent", .res_class = "presenter"};
XWMHints wm = {.flags = InputHint, .input = True};
XSizeHints *sizeh = NULL;
if (!(sizeh = XAllocSizeHints()))
eprintf("sent: Could not alloc size hints");
sizeh->flags = PSize;
sizeh->height = xw.h;
sizeh->width = xw.w;
XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
XFree(sizeh);
}
void xinit()
{
XTextProperty prop;
if (!(xw.dpy = XOpenDisplay(NULL)))
eprintf("Can't open display.");
xw.scr = XDefaultScreen(xw.dpy);
xw.vis = XDefaultVisual(xw.dpy, xw.scr);
xw.w = DisplayWidth(xw.dpy, xw.scr);
xw.h = DisplayHeight(xw.dpy, xw.scr);
xw.attrs.background_pixel = WhitePixel(xw.dpy, xw.scr);
xw.attrs.bit_gravity = CenterGravity;
xw.attrs.event_mask = KeyPressMask | ExposureMask | StructureNotifyMask
| ButtonMotionMask | ButtonPressMask;
xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput, xw.vis,
CWBackPixel | CWBitGravity | CWEventMask, &xw.attrs);
xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
xloadfonts(opt_font ? opt_font : font);
XStringListToTextProperty(&argv0, 1, &prop);
XSetWMName(xw.dpy, xw.win, &prop);
XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
XFree(prop.value);
XMapWindow(xw.dpy, xw.win);
xhints();
XSync(xw.dpy, False);
}
void xloadfonts(char *fontstr)
{
int count = 0;
int i = 0;
XFontStruct *fnt;
XGCValues gcvalues;
struct DC *cur = &dc;
char **fstr = XListFonts(xw.dpy, fontstr, 42, &count);
while (count-- && !xfontisscalable(fstr[count]))
; /* nothing, just get first scalable font result */
if (count < 0)
eprintf("sent: could not find a scalable font matching %s", fontstr);
memset(&gcvalues, 0, sizeof(gcvalues));
do {
if (!(fnt = xloadqueryscalablefont(fstr[count], FONTSZ(i)))) {
i++;
continue;
}
cur->gc = XCreateGC(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, &gcvalues);
cur->font = fnt;
XSetFont(xw.dpy, cur->gc, fnt->fid);
XSetForeground(xw.dpy, cur->gc, BlackPixel(xw.dpy, xw.scr));
cur->next = (++i < NUMFONTS) ? malloc(sizeof(struct DC)) : NULL;
cur = cur->next;
} while (cur && i < NUMFONTS);
if (cur == &dc)
eprintf("sent: could not load fonts.");
XFreeFontNames(fstr);
}
void bpress(XEvent *e)
{
unsigned int i;
for (i = 0; i < LEN(mshortcuts); i++)
if (e->xbutton.button == mshortcuts[i].b && mshortcuts[i].func)
mshortcuts[i].func(&(mshortcuts[i].arg));
}
void cmessage(XEvent *e)
{
if (e->xclient.data.l[0] == xw.wmdeletewin)
running = 0;
}
void expose(XEvent *e)
{
if (0 == e->xexpose.count)
xdraw();
}
void kpress(XEvent *e)
{
unsigned int i;
KeySym sym;
sym = XkbKeycodeToKeysym(xw.dpy, (KeyCode)e->xkey.keycode, 0, 0);
for (i = 0; i < LEN(shortcuts); i++)
if (sym == shortcuts[i].keysym && shortcuts[i].func)
shortcuts[i].func(&(shortcuts[i].arg));
}
void resize(XEvent *e)
{
xw.w = e->xconfigure.width;
xw.h = e->xconfigure.height;
xdraw();
}
int main(int argc, char *argv[])
{
int i;
FILE *fp = NULL;
ARGBEGIN {
case 'f':
opt_font = EARGF(usage());
break;
case 'v':
default:
usage();
} ARGEND;
for (i = 0; i < argc; i++) {
if ((fp = strcmp(argv[i], "-") ? fopen(argv[i], "r") : stdin)) {
load(fp);
fclose(fp);
} else {
eprintf("could not open file %s for reading:", argv[i]);
}
}
if (!slides || !slides[0].text)
usage();
xinit();
run();
cleanup(&dc);
return EXIT_SUCCESS;
}