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#include <X11/Xlib.h>
#include <cairo.h>
#include <cairo-xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include "../overlay.h"
struct x11_window {
struct overlay base;
Display *dpy;
Window win;
int width, height;
int visible;
};
static inline struct x11_window *to_x11_window(struct overlay *o)
{
return (struct x11_window *)o;
}
static int noop(Display *dpy, XErrorEvent *event)
{
return 0;
}
static void x11_window_show(struct overlay *overlay)
{
struct x11_window *priv = to_x11_window(overlay);
if (!priv->visible) {
XMapWindow(priv->dpy, priv->win);
priv->visible = true;
}
XFlush(priv->dpy);
}
static void x11_window_position(struct overlay *overlay,
enum position p)
{
struct x11_window *priv = to_x11_window(overlay);
Screen *scr = ScreenOfDisplay(priv->dpy, DefaultScreen(priv->dpy));
int x, y;
switch (p & 7) {
default:
case 0: x = 0; break;
case 1: x = (scr->width - priv->width)/2; break;
case 2: x = scr->width - priv->width; break;
}
switch ((p >> 4) & 7) {
default:
case 0: y = 0; break;
case 1: y = (scr->height - priv->height)/2; break;
case 2: y = scr->height - priv->height; break;
}
if (priv->visible) {
XMoveWindow(priv->dpy, priv->win, x, y);
XFlush(priv->dpy);
}
}
static void x11_window_hide(struct overlay *overlay)
{
struct x11_window *priv = to_x11_window(overlay);
if (priv->visible) {
XUnmapWindow(priv->dpy, priv->win);
XFlush(priv->dpy);
priv->visible = false;
}
}
static void x11_window_destroy(void *data)
{
struct x11_window *priv = data;
XDestroyWindow(priv->dpy, priv->win);
XCloseDisplay(priv->dpy);
free(priv);
}
cairo_surface_t *
x11_window_create(enum position position, int *width, int *height)
{
Display *dpy;
Screen *scr;
Window win;
int screen;
cairo_surface_t *surface;
XSetWindowAttributes attr;
struct x11_window *priv;
int x, y, w, h;
dpy = XOpenDisplay(NULL);
if (dpy == NULL)
return NULL;
screen = DefaultScreen(dpy);
scr = XScreenOfDisplay(dpy, screen);
XSetErrorHandler(noop);
if (*width == -1) {
w = scr->width;
switch (position & 7) {
default:
case 0:
case 2: w >>= 1; break;
}
} else if (*width > scr->width) {
w = scr->width;
} else
w = *width;
if (*height == -1) {
h = scr->height;
switch ((position >> 4) & 7) {
default:
case 0:
case 2: h >>= 1; break;
}
} else if (*height > scr->height)
h = scr->height;
else
h = *height;
switch (position & 7) {
default:
case 0: x = 0; break;
case 1: x = (scr->width - w)/2; break;
case 2: x = scr->width - w; break;
}
switch ((position >> 4) & 7) {
default:
case 0: y = 0; break;
case 1: y = (scr->height - h)/2; break;
case 2: y = scr->height - h; break;
}
attr.override_redirect = True;
win = XCreateWindow(dpy, DefaultRootWindow(dpy),
x, y, w, h, 0,
DefaultDepth(dpy, screen),
InputOutput,
DefaultVisual(dpy, screen),
CWOverrideRedirect, &attr);
surface = cairo_xlib_surface_create(dpy, win, DefaultVisual (dpy, screen), w, h);
if (cairo_surface_status(surface))
goto err_win;
priv = malloc(sizeof(*priv));
if (priv == NULL)
goto err_surface;
priv->base.surface = surface;
priv->base.show = x11_window_show;
priv->base.position = x11_window_position;
priv->base.hide = x11_window_hide;
priv->dpy = dpy;
priv->win = win;
priv->visible = false;
priv->width = w;
priv->height = h;
cairo_surface_set_user_data(surface, &overlay_key, priv, x11_window_destroy);
*width = w;
*height = h;
return surface;
err_surface:
cairo_surface_destroy(surface);
err_win:
XDestroyWindow(dpy, win);
XCloseDisplay(dpy);
return NULL;
}
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