summaryrefslogtreecommitdiff
path: root/libmate-desktop/mate-rr-labeler.c
blob: c490ed21e537cffc213ed00002d3610dd0d88c21 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * mate-rr-labeler.c - Utility to label monitors to identify them
 * while they are being configured.
 *
 * Copyright 2008, Novell, Inc.
 *
 * This file is part of the Mate Library.
 *
 * The Mate Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The Mate Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Mate Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * Author: Federico Mena-Quintero <federico@novell.com>
 */

#define MATE_DESKTOP_USE_UNSTABLE_API

#include <config.h>
#include <glib/gi18n-lib.h>
#include "mate-rr-labeler.h"
#include <gtk/gtk.h>

#include <X11/Xproto.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <gdk/gdkx.h>

struct _MateRRLabeler {
	GObject parent;

	MateRRConfig *config;

	int num_outputs;

#if GTK_CHECK_VERSION(3, 0, 0)
	GdkRGBA *palette;
#else
	GdkColor *palette;
#endif
	GtkWidget **windows;

	GdkScreen  *screen;
	Atom        workarea_atom;
};

struct _MateRRLabelerClass {
	GObjectClass parent_class;
};

G_DEFINE_TYPE (MateRRLabeler, mate_rr_labeler, G_TYPE_OBJECT);

static void mate_rr_labeler_finalize (GObject *object);
static void create_label_windows (MateRRLabeler *labeler);

static gboolean
get_work_area (MateRRLabeler *labeler,
	       GdkRectangle   *rect)
{
	Atom            workarea;
	Atom            type;
	Window          win;
	int             format;
	gulong          num;
	gulong          leftovers;
	gulong          max_len = 4 * 32;
	guchar         *ret_workarea;
	long           *workareas;
	int             result;
	int             disp_screen;
	Display        *display;

	display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (labeler->screen));
	workarea = XInternAtom (display, "_NET_WORKAREA", True);

	disp_screen = GDK_SCREEN_XNUMBER (labeler->screen);

	/* Defaults in case of error */
	rect->x = 0;
	rect->y = 0;
	rect->width = gdk_screen_get_width (labeler->screen);
	rect->height = gdk_screen_get_height (labeler->screen);

	if (workarea == None)
		return FALSE;

	win = XRootWindow (display, disp_screen);
	result = XGetWindowProperty (display,
				     win,
				     workarea,
				     0,
				     max_len,
				     False,
				     AnyPropertyType,
				     &type,
				     &format,
				     &num,
				     &leftovers,
				     &ret_workarea);

	if (result != Success
	    || type == None
	    || format == 0
	    || leftovers
	    || num % 4) {
		return FALSE;
	}

	workareas = (long *) ret_workarea;
	rect->x = workareas[disp_screen * 4];
	rect->y = workareas[disp_screen * 4 + 1];
	rect->width = workareas[disp_screen * 4 + 2];
	rect->height = workareas[disp_screen * 4 + 3];

	XFree (ret_workarea);

	return TRUE;
}

static GdkFilterReturn
screen_xevent_filter (GdkXEvent      *xevent,
		      GdkEvent       *event,
		      MateRRLabeler *labeler)
{
	XEvent *xev;

	xev = (XEvent *) xevent;

	if (xev->type == PropertyNotify &&
	    xev->xproperty.atom == labeler->workarea_atom) {
		/* update label positions */
		mate_rr_labeler_hide (labeler);
		create_label_windows (labeler);
	}

	return GDK_FILTER_CONTINUE;
}

static void
mate_rr_labeler_init (MateRRLabeler *labeler)
{
	GdkWindow *gdkwindow;

	labeler->workarea_atom = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
					      "_NET_WORKAREA",
					      True);

	labeler->screen = gdk_screen_get_default ();
	/* code is not really designed to handle multiple screens so *shrug* */
	gdkwindow = gdk_screen_get_root_window (labeler->screen);
	gdk_window_add_filter (gdkwindow, (GdkFilterFunc) screen_xevent_filter, labeler);
	gdk_window_set_events (gdkwindow, gdk_window_get_events (gdkwindow) | GDK_PROPERTY_CHANGE_MASK);
}

static void
mate_rr_labeler_class_init (MateRRLabelerClass *class)
{
	GObjectClass *object_class;

	object_class = (GObjectClass *) class;

	object_class->finalize = mate_rr_labeler_finalize;
}

static void
mate_rr_labeler_finalize (GObject *object)
{
	MateRRLabeler *labeler;
	GdkWindow      *gdkwindow;

	labeler = MATE_RR_LABELER (object);

	gdkwindow = gdk_screen_get_root_window (labeler->screen);
	gdk_window_remove_filter (gdkwindow, (GdkFilterFunc) screen_xevent_filter, labeler);

	/* We don't destroy the labeler->config (a MateRRConfig*) here; let our
	 * caller do that instead.
	 */

	if (labeler->windows != NULL) {
		mate_rr_labeler_hide (labeler);
		g_free (labeler->windows);
		labeler->windows = NULL;
	}

	g_free (labeler->palette);
	labeler->palette = NULL;

	G_OBJECT_CLASS (mate_rr_labeler_parent_class)->finalize (object);
}

static int
count_outputs (MateRRConfig *config)
{
	int i;

	for (i = 0; config->outputs[i] != NULL; i++)
		;

	return i;
}

static void
make_palette (MateRRLabeler *labeler)
{
	/* The idea is that we go around an hue color wheel.  We want to start
	 * at red, go around to green/etc. and stop at blue --- because magenta
	 * is evil.  Eeeeek, no magenta, please!
	 *
	 * Purple would be nice, though.  Remember that we are watered down
	 * (i.e. low saturation), so that would be like Like berries with cream.
	 * Mmmmm, berries.
	 */
	double start_hue;
	double end_hue;
	int i;

	g_assert (labeler->num_outputs > 0);

#if GTK_CHECK_VERSION(3, 0, 0)
	labeler->palette = g_new (GdkRGBA, labeler->num_outputs);
#else
	labeler->palette = g_new (GdkColor, labeler->num_outputs);
#endif

	start_hue = 0.0; /* red */
	end_hue   = 2.0/3; /* blue */

	for (i = 0; i < labeler->num_outputs; i++) {
		double h, s, v;
		double r, g, b;

		h = start_hue + (end_hue - start_hue) / labeler->num_outputs * i;
		s = 1.0 / 3;
		v = 1.0;

		gtk_hsv_to_rgb (h, s, v, &r, &g, &b);

#if GTK_CHECK_VERSION(3, 0, 0)
		labeler->palette[i].red   = r;
		labeler->palette[i].green = g;
		labeler->palette[i].blue  = b;
		labeler->palette[i].alpha = 1.0;
#else
		labeler->palette[i].red   = (int) (65535 * r + 0.5);
		labeler->palette[i].green = (int) (65535 * g + 0.5);
		labeler->palette[i].blue  = (int) (65535 * b + 0.5);
#endif
	}
}

#define LABEL_WINDOW_EDGE_THICKNESS 2
#define LABEL_WINDOW_PADDING 12

static gboolean
#if GTK_CHECK_VERSION (3, 0, 0)
label_window_draw_event_cb (GtkWidget *widget, cairo_t *cr, gpointer data)
#else
label_window_expose_event_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
#endif
{
#if GTK_CHECK_VERSION(3, 0, 0)
	GdkRGBA *color;
#else
	GdkColor *color;
#endif
	GtkAllocation allocation;

	color = g_object_get_data (G_OBJECT (widget), "color");
	gtk_widget_get_allocation (widget, &allocation);

#if !GTK_CHECK_VERSION (3, 0, 0)
	cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
#endif

	/* edge outline */

	cairo_set_source_rgb (cr, 0, 0, 0);
	cairo_rectangle (cr,
			 LABEL_WINDOW_EDGE_THICKNESS / 2.0,
			 LABEL_WINDOW_EDGE_THICKNESS / 2.0,
			 allocation.width - LABEL_WINDOW_EDGE_THICKNESS,
			 allocation.height - LABEL_WINDOW_EDGE_THICKNESS);
	cairo_set_line_width (cr, LABEL_WINDOW_EDGE_THICKNESS);
	cairo_stroke (cr);

	/* fill */

#if GTK_CHECK_VERSION(3, 0, 0)
	gdk_cairo_set_source_rgba (cr, color);
#else
	gdk_cairo_set_source_color (cr, color);
#endif
	cairo_rectangle (cr,
			 LABEL_WINDOW_EDGE_THICKNESS,
			 LABEL_WINDOW_EDGE_THICKNESS,
			 allocation.width - LABEL_WINDOW_EDGE_THICKNESS * 2,
			 allocation.height - LABEL_WINDOW_EDGE_THICKNESS * 2);
	cairo_fill (cr);

#if !GTK_CHECK_VERSION (3, 0, 0)
	cairo_destroy (cr);
#endif

	return FALSE;
}

static void
position_window (MateRRLabeler  *labeler,
		 GtkWidget       *window,
		 int              x,
		 int              y)
{
	GdkRectangle    workarea;
	GdkRectangle    monitor;
	int             monitor_num;

	get_work_area (labeler, &workarea);
	monitor_num = gdk_screen_get_monitor_at_point (labeler->screen, x, y);
	gdk_screen_get_monitor_geometry (labeler->screen,
                                         monitor_num,
                                         &monitor);
	gdk_rectangle_intersect (&monitor, &workarea, &workarea);

	gtk_window_move (GTK_WINDOW (window), workarea.x, workarea.y);
}

static GtkWidget *
#if GTK_CHECK_VERSION(3, 0, 0)
create_label_window (MateRRLabeler *labeler, MateOutputInfo *output, GdkRGBA *color)
#else
create_label_window (MateRRLabeler *labeler, MateOutputInfo *output, GdkColor *color)
#endif
{
	GtkWidget *window;
	GtkWidget *widget;
	char *str;
	const char *display_name;
#if GTK_CHECK_VERSION (3, 0, 0)
	GdkRGBA black = { 0.0, 0.0, 0.0, 1.0 };
#else
	GdkColor black = { 0, 0, 0, 0 };
#endif

	window = gtk_window_new (GTK_WINDOW_POPUP);
	gtk_widget_set_app_paintable (window, TRUE);

	gtk_container_set_border_width (GTK_CONTAINER (window), LABEL_WINDOW_PADDING + LABEL_WINDOW_EDGE_THICKNESS);

	/* This is semi-dangerous.  The color is part of the labeler->palette
	 * array.  Note that in mate_rr_labeler_finalize(), we are careful to
	 * free the palette only after we free the windows.
	 */
	g_object_set_data (G_OBJECT (window), "color", color);

#if GTK_CHECK_VERSION (3, 0, 0)
	g_signal_connect (window, "draw",
			  G_CALLBACK (label_window_draw_event_cb), labeler);
#else
	g_signal_connect (window, "expose-event",
			  G_CALLBACK (label_window_expose_event_cb), labeler);
#endif

	if (labeler->config->clone) {
		/* Keep this string in sync with mate-control-center/capplets/display/xrandr-capplet.c:get_display_name() */

		/* Translators:  this is the feature where what you see on your laptop's
		 * screen is the same as your external monitor.  Here, "Mirror" is being
		 * used as an adjective, not as a verb.  For example, the Spanish
		 * translation could be "Pantallas en Espejo", *not* "Espejar Pantallas".
		 */
		display_name = _("Mirror Screens");
	} else
		display_name = output->display_name;

	str = g_strdup_printf ("<b>%s</b>", display_name);
	widget = gtk_label_new (NULL);
	gtk_label_set_markup (GTK_LABEL (widget), str);
	g_free (str);

	/* Make the label explicitly black.  We don't want it to follow the
	 * theme's colors, since the label is always shown against a light
	 * pastel background.  See bgo#556050
	 */
#if GTK_CHECK_VERSION(3, 0, 0)
	gtk_widget_override_color( widget, gtk_widget_get_state_flags (widget), &black);
#else
	gtk_widget_modify_fg (widget, gtk_widget_get_state (widget), &black);
#endif

	gtk_container_add (GTK_CONTAINER (window), widget);

	/* Should we center this at the top edge of the monitor, instead of using the upper-left corner? */
	position_window (labeler, window, output->x, output->y);

	gtk_widget_show_all (window);

	return window;
}

static void
create_label_windows (MateRRLabeler *labeler)
{
	int i;
	gboolean created_window_for_clone;

	labeler->windows = g_new (GtkWidget *, labeler->num_outputs);

	created_window_for_clone = FALSE;

	for (i = 0; i < labeler->num_outputs; i++) {
		if (!created_window_for_clone && labeler->config->outputs[i]->on) {
			labeler->windows[i] = create_label_window (labeler, labeler->config->outputs[i], labeler->palette + i);

			if (labeler->config->clone)
				created_window_for_clone = TRUE;
		} else
			labeler->windows[i] = NULL;
	}
}

static void
setup_from_config (MateRRLabeler *labeler)
{
	labeler->num_outputs = count_outputs (labeler->config);

	make_palette (labeler);

	create_label_windows (labeler);
}

MateRRLabeler *
mate_rr_labeler_new (MateRRConfig *config)
{
	MateRRLabeler *labeler;

	g_return_val_if_fail (config != NULL, NULL);

	labeler = g_object_new (MATE_TYPE_RR_LABELER, NULL);
	labeler->config = config;

	setup_from_config (labeler);

	return labeler;
}

void
mate_rr_labeler_hide (MateRRLabeler *labeler)
{
	int i;

	g_return_if_fail (MATE_IS_RR_LABELER (labeler));

	if (labeler->windows == NULL)
		return;

	for (i = 0; i < labeler->num_outputs; i++)
		if (labeler->windows[i] != NULL) {
			gtk_widget_destroy (labeler->windows[i]);
			labeler->windows[i] = NULL;
		}
	g_free (labeler->windows);
	labeler->windows = NULL;

}

#if GTK_CHECK_VERSION (3, 0, 0)
void
mate_rr_labeler_get_rgba_for_output (MateRRLabeler *labeler, MateOutputInfo *output, GdkRGBA *color_out)
{
	int i;

	g_return_if_fail (MATE_IS_RR_LABELER (labeler));
	g_return_if_fail (output != NULL);
	g_return_if_fail (color_out != NULL);

	for (i = 0; i < labeler->num_outputs; i++)
		if (labeler->config->outputs[i] == output) {
			*color_out = labeler->palette[i];
			return;
		}

	g_warning ("trying to get the color for unknown MateOutputInfo %p; returning magenta!", output);

	color_out->red   = 1.0;
	color_out->green = 0;
	color_out->blue  = 1.0;
	color_out->alpha = 1.0;
}
#endif

void
mate_rr_labeler_get_color_for_output (MateRRLabeler *labeler, MateOutputInfo *output, GdkColor *color_out)
{
	int i;

	g_return_if_fail (MATE_IS_RR_LABELER (labeler));
	g_return_if_fail (output != NULL);
	g_return_if_fail (color_out != NULL);

	for (i = 0; i < labeler->num_outputs; i++)
		if (labeler->config->outputs[i] == output) {
#if GTK_CHECK_VERSION (3, 0, 0)
			color_out->red = labeler->palette[i].red * 0xffff;
			color_out->green = labeler->palette[i].green * 0xffff;
			color_out->blue = labeler->palette[i].blue * 0xffff;
#else
			color_out->red = labeler->palette[i].red;
			color_out->green = labeler->palette[i].green;
			color_out->blue = labeler->palette[i].blue;
#endif
			return;
		}

	g_warning ("trying to get the color for unknown MateOutputInfo %p; returning magenta!", output);

	color_out->red   = 0xffff;
	color_out->green = 0;
	color_out->blue  = 0xffff;
}