clients: Fork clickdot as confine

The new confine client will be used to demonstrate pointer confinement.
It is so far identical to clickdot except that it doesn't respond to
clicks.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>

Makefile.am

@@ -461,6 +461,7 @@ demo_clients =					\
 	weston-resizor				\
 	weston-eventdemo			\
 	weston-clickdot				\
+	weston-confine				\
 	weston-transformed			\
 	weston-fullscreen			\
 	weston-stacking				\
@@ -669,6 +670,12 @@ weston_clickdot_SOURCES = 				\
 weston_clickdot_LDADD = libtoytoolkit.la
 weston_clickdot_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)
 
+weston_confine_SOURCES = 				\
+	clients/confine.c				\
+	shared/helpers.h
+weston_confine_LDADD = libtoytoolkit.la
+weston_confine_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)
+
 weston_transformed_SOURCES = clients/transformed.c
 weston_transformed_LDADD = libtoytoolkit.la
 weston_transformed_CFLAGS = $(AM_CFLAGS) $(CLIENT_CFLAGS)

clients/confine.c

@@ -0,0 +1,331 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ * Copyright © 2012 Collabora, Ltd.
+ * Copyright © 2012 Jonas Ådahl
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cairo.h>
+#include <math.h>
+#include <assert.h>
+#include <sys/timerfd.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+
+#include <linux/input.h>
+#include <wayland-client.h>
+
+#include "window.h"
+#include "shared/helpers.h"
+#include "shared/xalloc.h"
+
+struct confine {
+	struct display *display;
+	struct window *window;
+	struct widget *widget;
+
+	cairo_surface_t *buffer;
+
+	struct {
+		int32_t x, y;
+		int32_t old_x, old_y;
+	} line;
+
+	int reset;
+
+	struct input *cursor_timeout_input;
+	int cursor_timeout_fd;
+	struct task cursor_timeout_task;
+};
+
+static void
+draw_line(struct confine *confine, cairo_t *cr,
+	  struct rectangle *allocation)
+{
+	cairo_t *bcr;
+	cairo_surface_t *tmp_buffer = NULL;
+
+	if (confine->reset) {
+		tmp_buffer = confine->buffer;
+		confine->buffer = NULL;
+		confine->line.x = -1;
+		confine->line.y = -1;
+		confine->line.old_x = -1;
+		confine->line.old_y = -1;
+		confine->reset = 0;
+	}
+
+	if (confine->buffer == NULL) {
+		confine->buffer =
+			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+						   allocation->width,
+						   allocation->height);
+		bcr = cairo_create(confine->buffer);
+		cairo_set_source_rgba(bcr, 0, 0, 0, 0);
+		cairo_rectangle(bcr,
+				0, 0,
+				allocation->width, allocation->height);
+		cairo_fill(bcr);
+	}
+	else
+		bcr = cairo_create(confine->buffer);
+
+	if (tmp_buffer) {
+		cairo_set_source_surface(bcr, tmp_buffer, 0, 0);
+		cairo_rectangle(bcr, 0, 0,
+				allocation->width, allocation->height);
+		cairo_clip(bcr);
+		cairo_paint(bcr);
+
+		cairo_surface_destroy(tmp_buffer);
+	}
+
+	if (confine->line.x != -1 && confine->line.y != -1) {
+		if (confine->line.old_x != -1 &&
+		    confine->line.old_y != -1) {
+			cairo_set_line_width(bcr, 2.0);
+			cairo_set_source_rgb(bcr, 1, 1, 1);
+			cairo_translate(bcr,
+					-allocation->x, -allocation->y);
+
+			cairo_move_to(bcr,
+				      confine->line.old_x,
+				      confine->line.old_y);
+			cairo_line_to(bcr,
+				      confine->line.x,
+				      confine->line.y);
+
+			cairo_stroke(bcr);
+		}
+
+		confine->line.old_x = confine->line.x;
+		confine->line.old_y = confine->line.y;
+	}
+	cairo_destroy(bcr);
+
+	cairo_set_source_surface(cr, confine->buffer,
+				 allocation->x, allocation->y);
+	cairo_set_operator(cr, CAIRO_OPERATOR_ADD);
+	cairo_rectangle(cr,
+			allocation->x, allocation->y,
+			allocation->width, allocation->height);
+	cairo_clip(cr);
+	cairo_paint(cr);
+}
+
+static void
+redraw_handler(struct widget *widget, void *data)
+{
+	struct confine *confine = data;
+	cairo_surface_t *surface;
+	cairo_t *cr;
+	struct rectangle allocation;
+
+	widget_get_allocation(confine->widget, &allocation);
+
+	surface = window_get_surface(confine->window);
+
+	cr = cairo_create(surface);
+	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+	cairo_rectangle(cr,
+			allocation.x,
+			allocation.y,
+			allocation.width,
+			allocation.height);
+	cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
+	cairo_fill(cr);
+
+	draw_line(confine, cr, &allocation);
+
+	cairo_destroy(cr);
+
+	cairo_surface_destroy(surface);
+}
+
+static void
+keyboard_focus_handler(struct window *window,
+		       struct input *device, void *data)
+{
+	struct confine *confine = data;
+
+	window_schedule_redraw(confine->window);
+}
+
+static void
+key_handler(struct window *window, struct input *input, uint32_t time,
+	    uint32_t key, uint32_t sym,
+	    enum wl_keyboard_key_state state, void *data)
+{
+	struct confine *confine = data;
+
+	if (state == WL_KEYBOARD_KEY_STATE_RELEASED)
+		return;
+
+	switch (sym) {
+	case XKB_KEY_Escape:
+		display_exit(confine->display);
+		break;
+	}
+}
+
+static void
+cursor_timeout_reset(struct confine *confine)
+{
+	const long cursor_timeout = 500;
+	struct itimerspec its;
+
+	its.it_interval.tv_sec = 0;
+	its.it_interval.tv_nsec = 0;
+	its.it_value.tv_sec = cursor_timeout / 1000;
+	its.it_value.tv_nsec = (cursor_timeout % 1000) * 1000 * 1000;
+	timerfd_settime(confine->cursor_timeout_fd, 0, &its, NULL);
+}
+
+static int
+motion_handler(struct widget *widget,
+	       struct input *input, uint32_t time,
+	       float x, float y, void *data)
+{
+	struct confine *confine = data;
+	confine->line.x = x;
+	confine->line.y = y;
+
+	window_schedule_redraw(confine->window);
+
+	cursor_timeout_reset(confine);
+	confine->cursor_timeout_input = input;
+
+	return CURSOR_BLANK;
+}
+
+static void
+resize_handler(struct widget *widget,
+	       int32_t width, int32_t height,
+	       void *data)
+{
+	struct confine *confine = data;
+
+	confine->reset = 1;
+}
+
+static void
+leave_handler(struct widget *widget,
+	      struct input *input, void *data)
+{
+	struct confine *confine = data;
+
+	confine->reset = 1;
+}
+
+static void
+cursor_timeout_func(struct task *task, uint32_t events)
+{
+	struct confine *confine =
+		container_of(task, struct confine, cursor_timeout_task);
+	uint64_t exp;
+
+	if (read(confine->cursor_timeout_fd, &exp, sizeof (uint64_t)) !=
+	    sizeof(uint64_t))
+		abort();
+
+	input_set_pointer_image(confine->cursor_timeout_input,
+				CURSOR_LEFT_PTR);
+}
+
+static struct confine *
+confine_create(struct display *display)
+{
+	struct confine *confine;
+
+	confine = xzalloc(sizeof *confine);
+	confine->window = window_create(display);
+	confine->widget = window_frame_create(confine->window, confine);
+	window_set_title(confine->window, "Wayland Confine");
+	confine->display = display;
+	confine->buffer = NULL;
+
+	window_set_key_handler(confine->window, key_handler);
+	window_set_user_data(confine->window, confine);
+	window_set_keyboard_focus_handler(confine->window,
+					  keyboard_focus_handler);
+
+	widget_set_redraw_handler(confine->widget, redraw_handler);
+	widget_set_motion_handler(confine->widget, motion_handler);
+	widget_set_resize_handler(confine->widget, resize_handler);
+	widget_set_leave_handler(confine->widget, leave_handler);
+
+	widget_schedule_resize(confine->widget, 500, 400);
+	confine->line.x = -1;
+	confine->line.y = -1;
+	confine->line.old_x = -1;
+	confine->line.old_y = -1;
+	confine->reset = 0;
+
+	confine->cursor_timeout_fd =
+		timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
+	confine->cursor_timeout_task.run = cursor_timeout_func;
+	display_watch_fd(window_get_display(confine->window),
+			 confine->cursor_timeout_fd,
+			 EPOLLIN, &confine->cursor_timeout_task);
+
+	return confine;
+}
+
+static void
+confine_destroy(struct confine *confine)
+{
+	display_unwatch_fd(window_get_display(confine->window),
+			   confine->cursor_timeout_fd);
+	close(confine->cursor_timeout_fd);
+	if (confine->buffer)
+		cairo_surface_destroy(confine->buffer);
+	widget_destroy(confine->widget);
+	window_destroy(confine->window);
+	free(confine);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct display *display;
+	struct confine *confine;
+
+	display = display_create(&argc, argv);
+	if (display == NULL) {
+		fprintf(stderr, "failed to create display: %m\n");
+		return -1;
+	}
+
+	confine = confine_create(display);
+
+	display_run(display);
+
+	confine_destroy(confine);
+	display_destroy(display);
+
+	return 0;
+}