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/* ghosd -- OSD with fake transparency, cairo, and pango.
* Copyright (C) 2006 Evan Martin <martine@danga.com>
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <cairo/cairo-xlib-xrender.h>
#include <X11/Xatom.h>
#include "ghosd.h"
#include "ghosd-internal.h"
static Pixmap
take_snapshot(Ghosd *ghosd) {
Pixmap pixmap;
GC gc;
/* create a pixmap to hold the screenshot. */
pixmap = XCreatePixmap(ghosd->dpy, ghosd->win,
ghosd->width, ghosd->height,
DefaultDepth(ghosd->dpy, DefaultScreen(ghosd->dpy)));
/* then copy the screen into the pixmap. */
gc = XCreateGC(ghosd->dpy, pixmap, 0, NULL);
XSetSubwindowMode(ghosd->dpy, gc, IncludeInferiors);
XCopyArea(ghosd->dpy, DefaultRootWindow(ghosd->dpy), pixmap, gc,
ghosd->x, ghosd->y, ghosd->width, ghosd->height,
0, 0);
XSetSubwindowMode(ghosd->dpy, gc, ClipByChildren);
XFreeGC(ghosd->dpy, gc);
return pixmap;
}
void
ghosd_render(Ghosd *ghosd) {
Pixmap pixmap;
GC gc;
/* make our own copy of the background pixmap as the initial surface. */
pixmap = XCreatePixmap(ghosd->dpy, ghosd->win, ghosd->width, ghosd->height,
DefaultDepth(ghosd->dpy, DefaultScreen(ghosd->dpy)));
gc = XCreateGC(ghosd->dpy, pixmap, 0, NULL);
if (ghosd->transparent) {
XCopyArea(ghosd->dpy, ghosd->background, pixmap, gc,
0, 0, ghosd->width, ghosd->height, 0, 0);
} else {
XFillRectangle(ghosd->dpy, pixmap, gc,
0, 0, ghosd->width, ghosd->height);
}
XFreeGC(ghosd->dpy, gc);
/* render with cairo. */
if (ghosd->render_func) {
/* create cairo surface using the pixmap. */
XRenderPictFormat *xrformat =
XRenderFindVisualFormat(ghosd->dpy,
DefaultVisual(ghosd->dpy,
DefaultScreen(ghosd->dpy)));
cairo_surface_t *surf =
cairo_xlib_surface_create_with_xrender_format(
ghosd->dpy, pixmap,
ScreenOfDisplay(ghosd->dpy, DefaultScreen(ghosd->dpy)),
xrformat,
ghosd->width, ghosd->height);
/* draw some stuff. */
cairo_t *cr = cairo_create(surf);
ghosd->render_func(ghosd, cr, ghosd->render_data);
cairo_destroy(cr);
}
/* point window at its new backing pixmap. */
XSetWindowBackgroundPixmap(ghosd->dpy, ghosd->win, pixmap);
XFreePixmap(ghosd->dpy, pixmap);
/* and tell the window to redraw with this pixmap. */
XClearWindow(ghosd->dpy, ghosd->win);
}
static void
set_hints(Display *dpy, Window win) {
/* we're almost a _NET_WM_WINDOW_TYPE_SPLASH, but we don't want
* to be centered on the screen. instead, manually request the
* behavior we want. */
/* turn off window decorations.
* we could pull this in from a motif header, but it's easier to
* use this snippet i found on a mailing list. */
Atom mwm_hints = XInternAtom(dpy, "_MOTIF_WM_HINTS", False);
#define MWM_HINTS_DECORATIONS (1<<1)
struct {
long flags, functions, decorations, input_mode;
} mwm_hints_setting = {
MWM_HINTS_DECORATIONS, 0, 0, 0
};
XChangeProperty(dpy, win,
mwm_hints, mwm_hints, 32, PropModeReplace,
(unsigned char *)&mwm_hints_setting, 4);
/* always on top, not in taskbar or pager. */
Atom win_state = XInternAtom(dpy, "_NET_WM_STATE", False);
Atom win_state_setting[] = {
XInternAtom(dpy, "_NET_WM_STATE_ABOVE", False),
XInternAtom(dpy, "_NET_WM_STATE_SKIP_TASKBAR", False),
XInternAtom(dpy, "_NET_WM_STATE_SKIP_PAGER", False)
};
XChangeProperty(dpy, win, win_state, XA_ATOM, 32,
PropModeReplace, (unsigned char*)&win_state_setting, 3);
}
static Window
make_window(Display *dpy) {
Window win;
XSetWindowAttributes att;
/* XXX I don't understand X well enough to know if these are the correct
* settings. */
att.backing_store = WhenMapped;
att.background_pixel = None;
att.border_pixel = 0;
att.background_pixmap = None;
att.save_under = True;
att.event_mask = ExposureMask | StructureNotifyMask;
att.override_redirect = True;
win = XCreateWindow(dpy, DefaultRootWindow(dpy),
-1, -1, 1, 1, 0,
CopyFromParent, InputOutput, CopyFromParent,
CWBackingStore | CWBackPixel | CWBackPixmap |
CWEventMask | CWSaveUnder | CWOverrideRedirect,
&att);
set_hints(dpy, win);
/* XXX: XSetClassHint? */
return win;
}
void
ghosd_show(Ghosd *ghosd) {
XMapWindow(ghosd->dpy, ghosd->win);
}
void
ghosd_set_transparent(Ghosd *ghosd, int transparent) {
ghosd->transparent = (transparent != 0);
}
void
ghosd_set_render(Ghosd *ghosd, GhosdRenderFunc render_func, void *render_data) {
ghosd->render_func = render_func;
ghosd->render_data = render_data;
}
void
ghosd_set_position(Ghosd *ghosd, int x, int y, int width, int height) {
const int dpy_width = DisplayWidth(ghosd->dpy, DefaultScreen(ghosd->dpy));
const int dpy_height = DisplayHeight(ghosd->dpy, DefaultScreen(ghosd->dpy));
if (x == GHOSD_COORD_CENTER) {
x = (dpy_width - width) / 2;
} else if (x < 0) {
x = dpy_width - width + x;
}
if (y == GHOSD_COORD_CENTER) {
y = (dpy_height - height) / 2;
} else if (y < 0) {
y = dpy_height - height + y;
}
ghosd->x = x;
ghosd->y = y;
ghosd->width = width;
ghosd->height = height;
if (ghosd->transparent)
ghosd->background = take_snapshot(ghosd);
XMoveResizeWindow(ghosd->dpy, ghosd->win,
ghosd->x, ghosd->y, ghosd->width, ghosd->height);
}
#if 0
static int
x_error_handler(Display *dpy, XErrorEvent* evt) {
/* segfault so we can get a backtrace. */
char *x = NULL;
*x = 0;
return 0;
}
#endif
Ghosd *
ghosd_new(void) {
Ghosd *ghosd;
Display *dpy;
Window win;
dpy = XOpenDisplay(NULL);
if (dpy == NULL) {
fprintf(stderr, "Couldn't open display: (XXX FIXME)\n");
return NULL;
}
win = make_window(dpy);
ghosd = calloc(1, sizeof(Ghosd));
ghosd->dpy = dpy;
ghosd->win = win;
ghosd->transparent = 1;
return ghosd;
}
int
ghosd_get_socket(Ghosd *ghosd) {
return ConnectionNumber(ghosd->dpy);
}
/* vim: set ts=2 sw=2 et cino=(0 : */
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