Imported Upstream version 0.13.2+dsfg1

plugins/linux-capture/xhelpers.c

@@ -0,0 +1,174 @@
+/*
+Copyright (C) 2014 by Leonhard Oelke <leonhard@in-verted.de>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdint.h>
+#include <sys/shm.h>
+#include <xcb/xcb.h>
+#include <xcb/xinerama.h>
+
+#include "xhelpers.h"
+
+bool xinerama_is_active(xcb_connection_t *xcb)
+{
+	if (!xcb || !xcb_get_extension_data(xcb, &xcb_xinerama_id)->present)
+		return false;
+
+	bool active = true;
+	xcb_xinerama_is_active_cookie_t xnr_c;
+	xcb_xinerama_is_active_reply_t  *xnr_r;
+
+	xnr_c = xcb_xinerama_is_active_unchecked(xcb);
+	xnr_r = xcb_xinerama_is_active_reply(xcb, xnr_c, NULL);
+	if (!xnr_r || xnr_r->state == 0)
+		active = false;
+	free(xnr_r);
+
+	return active;
+}
+
+int xinerama_screen_count(xcb_connection_t *xcb)
+{
+	if (!xcb)
+		return 0;
+
+	int screens = 0;
+	xcb_xinerama_query_screens_cookie_t scr_c;
+	xcb_xinerama_query_screens_reply_t  *scr_r;
+
+	scr_c = xcb_xinerama_query_screens_unchecked(xcb);
+	scr_r = xcb_xinerama_query_screens_reply(xcb, scr_c, NULL);
+	if (scr_r)
+		screens = scr_r->number;
+	free(scr_r);
+
+	return screens;
+}
+
+int xinerama_screen_geo(xcb_connection_t *xcb, int_fast32_t screen,
+		int_fast32_t *x, int_fast32_t *y,
+		int_fast32_t *w, int_fast32_t *h)
+{
+	if (!xcb)
+		goto fail;
+
+	bool success = false;
+	xcb_xinerama_query_screens_cookie_t scr_c;
+	xcb_xinerama_query_screens_reply_t  *scr_r;
+	xcb_xinerama_screen_info_iterator_t iter;
+
+	scr_c = xcb_xinerama_query_screens_unchecked(xcb);
+	scr_r = xcb_xinerama_query_screens_reply(xcb, scr_c, NULL);
+	if (!scr_r)
+		goto fail;
+
+	iter = xcb_xinerama_query_screens_screen_info_iterator(scr_r);
+	for (; iter.rem; --screen, xcb_xinerama_screen_info_next(&iter)) {
+		if (!screen) {
+			*x = iter.data->x_org;
+			*y = iter.data->y_org;
+			*w = iter.data->width;
+			*h = iter.data->height;
+			success = true;
+		}
+	}
+	free(scr_r);
+
+	if (success)
+		return 0;
+
+fail:
+	*x = *y = *w = *h = 0;
+	return -1;
+}
+
+int x11_screen_geo(xcb_connection_t *xcb, int_fast32_t screen,
+		int_fast32_t *w, int_fast32_t *h)
+{
+	if (!xcb)
+		goto fail;
+
+	bool success = false;
+	xcb_screen_iterator_t iter;
+
+	iter = xcb_setup_roots_iterator(xcb_get_setup(xcb));
+	for (; iter.rem; --screen, xcb_screen_next(&iter)) {
+		if (!screen) {
+			*w = iter.data->width_in_pixels;
+			*h = iter.data->height_in_pixels;
+			success = true;
+		}
+	}
+
+	if (success)
+		return 0;
+
+fail:
+	*w = *h = 0;
+	return -1;
+}
+
+xcb_shm_t* xshm_xcb_attach(xcb_connection_t *xcb, const int w, const int h)
+{
+	if (!xcb)
+		return NULL;
+
+	xcb_shm_t *shm = bzalloc(sizeof(xcb_shm_t));
+	shm->xcb       = xcb;
+	shm->seg       = xcb_generate_id(shm->xcb);
+
+	shm->shmid = shmget(IPC_PRIVATE, w * h * 4, IPC_CREAT | 0777);
+	if (shm->shmid == -1)
+		goto fail;
+
+	xcb_shm_attach(shm->xcb, shm->seg, shm->shmid, false);
+
+	shm->data = shmat(shm->shmid, NULL, 0);
+
+	return shm;
+fail:
+	xshm_xcb_detach(shm);
+	return NULL;
+}
+
+void xshm_xcb_detach(xcb_shm_t *shm)
+{
+	if (!shm)
+		return;
+
+	xcb_shm_detach(shm->xcb, shm->seg);
+
+	if ((char *) shm->data != (char *) -1)
+		shmdt(shm->data);
+
+	if (shm->shmid != -1)
+		shmctl(shm->shmid, IPC_RMID, NULL);
+
+	bfree(shm);
+}
+
+xcb_screen_t *xcb_get_screen(xcb_connection_t *xcb, int screen)
+{
+	xcb_screen_iterator_t iter;
+
+	iter = xcb_setup_roots_iterator(xcb_get_setup(xcb));
+	for (; iter.rem; --screen, xcb_screen_next(&iter)) {
+		if (screen == 0)
+			return iter.data;
+	}
+
+	return NULL;
+}