weston/clients/confine.c

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/*
* 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 <stdbool.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"
#define NUM_COMPLEX_REGION_RECTS 9
static int32_t option_complex_confine_region;
static int32_t option_help;
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;
bool pointer_confined;
bool complex_confine_region_enabled;
bool complex_confine_region_dirty;
struct rectangle complex_confine_region[NUM_COMPLEX_REGION_RECTS];
};
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
calculate_complex_confine_region(struct confine *confine)
{
struct rectangle allocation;
int32_t x, y, w, h;
struct rectangle *rs = confine->complex_confine_region;
if (!confine->complex_confine_region_dirty)
return;
widget_get_allocation(confine->widget, &allocation);
x = allocation.x;
y = allocation.y;
w = allocation.width;
h = allocation.height;
/*
* The code below constructs a region made up of rectangles that
* is then used to set up both an illustrative shaded region in the
* widget and a confine region used when confining the pointer.
*/
rs[0].x = x + (int)round(w * 0.05);
rs[0].y = y + (int)round(h * 0.15);
rs[0].width = (int)round(w * 0.35);
rs[0].height = (int)round(h * 0.7);
rs[1].x = rs[0].x + rs[0].width;
rs[1].y = y + (int)round(h * 0.45);
rs[1].width = (int)round(w * 0.09);
rs[1].height = (int)round(h * 0.1);
rs[2].x = rs[1].x + rs[1].width;
rs[2].y = y + (int)round(h * 0.48);
rs[2].width = (int)round(w * 0.02);
rs[2].height = (int)round(h * 0.04);
rs[3].x = rs[2].x + rs[2].width;
rs[3].y = y + (int)round(h * 0.45);
rs[3].width = (int)round(w * 0.09);
rs[3].height = (int)round(h * 0.1);
rs[4].x = rs[3].x + rs[3].width;
rs[4].y = y + (int)round(h * 0.15);
rs[4].width = (int)round(w * 0.35);
rs[4].height = (int)round(h * 0.7);
rs[5].x = x + (int)round(w * 0.05);
rs[5].y = y + (int)round(h * 0.05);
rs[5].width = rs[0].width + rs[1].width + rs[2].width +
rs[3].width + rs[4].width;
rs[5].height = (int)round(h * 0.10);
rs[6].x = x + (int)round(w * 0.1);
rs[6].y = rs[4].y + rs[4].height + (int)round(h * 0.02);
rs[6].width = (int)round(w * 0.8);
rs[6].height = (int)round(h * 0.03);
rs[7].x = x + (int)round(w * 0.05);
rs[7].y = rs[6].y + rs[6].height;
rs[7].width = (int)round(w * 0.9);
rs[7].height = (int)round(h * 0.03);
rs[8].x = x + (int)round(w * 0.1);
rs[8].y = rs[7].y + rs[7].height;
rs[8].width = (int)round(w * 0.8);
rs[8].height = (int)round(h * 0.03);
confine->complex_confine_region_dirty = false;
}
static void
draw_complex_confine_region_mask(struct confine *confine, cairo_t *cr)
{
int i;
calculate_complex_confine_region(confine);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
for (i = 0; i < NUM_COMPLEX_REGION_RECTS; i++) {
cairo_rectangle(cr,
confine->complex_confine_region[i].x,
confine->complex_confine_region[i].y,
confine->complex_confine_region[i].width,
confine->complex_confine_region[i].height);
cairo_set_source_rgba(cr, 0.14, 0.14, 0.14, 0.9);
cairo_fill(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);
if (confine->complex_confine_region_enabled) {
draw_complex_confine_region_mask(confine, 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;
case XKB_KEY_BackSpace:
cairo_surface_destroy(confine->buffer);
confine->buffer = NULL;
window_schedule_redraw(confine->window);
break;
case XKB_KEY_m:
window_set_maximized(confine->window,
!window_is_maximized(window));
break;
}
}
static void
toggle_pointer_confine(struct confine *confine, struct input *input)
{
if (confine->pointer_confined) {
window_unconfine_pointer(confine->window);
} else if (confine->complex_confine_region_enabled) {
calculate_complex_confine_region(confine);
window_confine_pointer_to_rectangles(
confine->window,
input,
confine->complex_confine_region,
NUM_COMPLEX_REGION_RECTS);
} else {
window_confine_pointer_to_widget(confine->window,
confine->widget,
input);
}
confine->pointer_confined = !confine->pointer_confined;
}
static void
button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct confine *confine = data;
bool is_pressed = state == WL_POINTER_BUTTON_STATE_PRESSED;
if (is_pressed && button == BTN_LEFT)
toggle_pointer_confine(confine, input);
widget_schedule_redraw(widget);
}
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;
if (confine->complex_confine_region_enabled) {
confine->complex_confine_region_dirty = true;
if (confine->pointer_confined) {
calculate_complex_confine_region(confine);
window_update_confine_rectangles(
confine->window,
confine->complex_confine_region,
NUM_COMPLEX_REGION_RECTS);
}
}
}
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 void
pointer_unconfined(struct window *window, struct input *input, void *data)
{
struct confine *confine = data;
confine->pointer_confined = false;
}
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);
window_set_pointer_confined_handler(confine->window,
NULL,
pointer_unconfined);
widget_set_redraw_handler(confine->widget, redraw_handler);
widget_set_button_handler(confine->widget, button_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);
}
static const struct weston_option confine_options[] = {
{ WESTON_OPTION_BOOLEAN, "complex-confine-region", 0, &option_complex_confine_region },
{ WESTON_OPTION_BOOLEAN, "help", 0, &option_help },
};
static void
print_help(const char *argv0)
{
printf("Usage: %s [--complex-confine-region]\n", argv0);
}
int
main(int argc, char *argv[])
{
struct display *display;
struct confine *confine;
if (parse_options(confine_options,
ARRAY_LENGTH(confine_options),
&argc, argv) > 1 ||
option_help) {
print_help(argv[0]);
return 0;
}
display = display_create(&argc, argv);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
confine = confine_create(display);
if (option_complex_confine_region) {
confine->complex_confine_region_dirty = true;
confine->complex_confine_region_enabled = true;
}
display_run(display);
confine_destroy(confine);
display_destroy(display);
return 0;
}