src/compositor-wayland.c

/*
 * Copyright © 2010-2011 Benjamin Franzke
 * Copyright © 2013 Jason Ekstrand
 *
 * 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 <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <linux/input.h>

#include <wayland-client.h>
#include <wayland-egl.h>
#include <wayland-cursor.h>

#include "compositor.h"
#include "gl-renderer.h"
#include "pixman-renderer.h"
#include "shared/helpers.h"
#include "shared/image-loader.h"
#include "shared/os-compatibility.h"
#include "shared/cairo-util.h"
#include "fullscreen-shell-unstable-v1-client-protocol.h"
#include "presentation_timing-server-protocol.h"
#include "linux-dmabuf.h"

#define WINDOW_TITLE "Weston Compositor"

struct wayland_backend {
	struct weston_backend base;
	struct weston_compositor *compositor;

	struct {
		struct wl_display *wl_display;
		struct wl_registry *registry;
		struct wl_compositor *compositor;
		struct wl_shell *shell;
		struct zwp_fullscreen_shell_v1 *fshell;
		struct wl_shm *shm;

		struct wl_list output_list;

		struct wl_event_source *wl_source;
		uint32_t event_mask;
	} parent;

	int use_pixman;
	int sprawl_across_outputs;

	struct theme *theme;
	cairo_device_t *frame_device;
	struct wl_cursor_theme *cursor_theme;
	struct wl_cursor *cursor;

	struct wl_list input_list;
};

struct wayland_output {
	struct weston_output base;

	struct {
		int draw_initial_frame;
		struct wl_surface *surface;

		struct wl_output *output;
		uint32_t global_id;

		struct wl_shell_surface *shell_surface;
		int configure_width, configure_height;
	} parent;

	int keyboard_count;

	char *name;
	struct frame *frame;

	struct {
		struct wl_egl_window *egl_window;
		struct {
			cairo_surface_t *top;
			cairo_surface_t *left;
			cairo_surface_t *right;
			cairo_surface_t *bottom;
		} border;
	} gl;

	struct {
		struct wl_list buffers;
		struct wl_list free_buffers;
	} shm;

	struct weston_mode mode;
	uint32_t scale;
};

struct wayland_parent_output {
	struct wayland_output *output;
	struct wl_list link;

	struct wl_output *global;
	uint32_t id;

	struct {
		char *make;
		char *model;
		int32_t width, height;
		uint32_t subpixel;
	} physical;

	int32_t x, y;
	uint32_t transform;
	uint32_t scale;

	struct wl_list mode_list;
	struct weston_mode *preferred_mode;
	struct weston_mode *current_mode;
};

struct wayland_shm_buffer {
	struct wayland_output *output;
	struct wl_list link;
	struct wl_list free_link;

	struct wl_buffer *buffer;
	void *data;
	size_t size;
	pixman_region32_t damage;
	int frame_damaged;

	pixman_image_t *pm_image;
	cairo_surface_t *c_surface;
};

struct wayland_input {
	struct weston_seat base;
	struct wayland_backend *backend;
	struct wl_list link;

	struct {
		struct wl_seat *seat;
		struct wl_pointer *pointer;
		struct wl_keyboard *keyboard;
		struct wl_touch *touch;

		struct {
			struct wl_surface *surface;
			int32_t hx, hy;
		} cursor;
	} parent;

	enum weston_key_state_update keyboard_state_update;
	uint32_t key_serial;
	uint32_t enter_serial;
	bool has_focus;
	int seat_version;

	struct wayland_output *output;
	struct wayland_output *keyboard_focus;
};

struct gl_renderer_interface *gl_renderer;

static void
wayland_shm_buffer_destroy(struct wayland_shm_buffer *buffer)
{
	cairo_surface_destroy(buffer->c_surface);
	pixman_image_unref(buffer->pm_image);

	wl_buffer_destroy(buffer->buffer);
	munmap(buffer->data, buffer->size);

	pixman_region32_fini(&buffer->damage);

	wl_list_remove(&buffer->link);
	wl_list_remove(&buffer->free_link);
	free(buffer);
}

static void
buffer_release(void *data, struct wl_buffer *buffer)
{
	struct wayland_shm_buffer *sb = data;

	if (sb->output) {
		wl_list_insert(&sb->output->shm.free_buffers, &sb->free_link);
	} else {
		wayland_shm_buffer_destroy(sb);
	}
}

static const struct wl_buffer_listener buffer_listener = {
	buffer_release
};

static struct wayland_shm_buffer *
wayland_output_get_shm_buffer(struct wayland_output *output)
{
	struct wayland_backend *b =
		(struct wayland_backend *) output->base.compositor->backend;
	struct wl_shm *shm = b->parent.shm;
	struct wayland_shm_buffer *sb;

	struct wl_shm_pool *pool;
	int width, height, stride;
	int32_t fx, fy;
	int fd;
	unsigned char *data;

	if (!wl_list_empty(&output->shm.free_buffers)) {
		sb = container_of(output->shm.free_buffers.next,
				  struct wayland_shm_buffer, free_link);
		wl_list_remove(&sb->free_link);
		wl_list_init(&sb->free_link);

		return sb;
	}

	if (output->frame) {
		width = frame_width(output->frame);
		height = frame_height(output->frame);
	} else {
		width = output->base.current_mode->width;
		height = output->base.current_mode->height;
	}

	stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);

	fd = os_create_anonymous_file(height * stride);
	if (fd < 0) {
		weston_log("could not create an anonymous file buffer: %m\n");
		return NULL;
	}

	data = mmap(NULL, height * stride, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (data == MAP_FAILED) {
		weston_log("could not mmap %d memory for data: %m\n", height * stride);
		close(fd);
		return NULL;
	}

	sb = zalloc(sizeof *sb);
	if (sb == NULL) {
		weston_log("could not zalloc %zu memory for sb: %m\n", sizeof *sb);
		close(fd);
		free(data);
		return NULL;
	}

	sb->output = output;
	wl_list_init(&sb->free_link);
	wl_list_insert(&output->shm.buffers, &sb->link);

	pixman_region32_init_rect(&sb->damage, 0, 0,
				  output->base.width, output->base.height);
	sb->frame_damaged = 1;

	sb->data = data;
	sb->size = height * stride;

	pool = wl_shm_create_pool(shm, fd, sb->size);

	sb->buffer = wl_shm_pool_create_buffer(pool, 0,
					       width, height,
					       stride,
					       WL_SHM_FORMAT_ARGB8888);
	wl_buffer_add_listener(sb->buffer, &buffer_listener, sb);
	wl_shm_pool_destroy(pool);
	close(fd);

	memset(data, 0, sb->size);

	sb->c_surface =
		cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32,
						    width, height, stride);

	fx = 0;
	fy = 0;
	if (output->frame)
		frame_interior(output->frame, &fx, &fy, 0, 0);
	sb->pm_image =
		pixman_image_create_bits(PIXMAN_a8r8g8b8, width, height,
					 (uint32_t *)(data + fy * stride) + fx,
					 stride);

	return sb;
}

static void
frame_done(void *data, struct wl_callback *callback, uint32_t time)
{
	struct weston_output *output = data;
	struct timespec ts;

	wl_callback_destroy(callback);

	/* XXX: use the presentation extension for proper timings */

	/*
	 * This is the fallback case, where Presentation extension is not
	 * available from the parent compositor. We do not know the base for
	 * 'time', so we cannot feed it to finish_frame(). Do the only thing
	 * we can, and pretend finish_frame time is when we process this
	 * event.
	 */
	weston_compositor_read_presentation_clock(output->compositor, &ts);
	weston_output_finish_frame(output, &ts, 0);
}

static const struct wl_callback_listener frame_listener = {
	frame_done
};

static void
draw_initial_frame(struct wayland_output *output)
{
	struct wayland_shm_buffer *sb;

	sb = wayland_output_get_shm_buffer(output);

	/* If we are rendering with GL, then orphan it so that it gets
	 * destroyed immediately */
	if (output->gl.egl_window)
		sb->output = NULL;

	wl_surface_attach(output->parent.surface, sb->buffer, 0, 0);
	wl_surface_damage(output->parent.surface, 0, 0,
			  output->base.current_mode->width,
			  output->base.current_mode->height);
}

static void
wayland_output_update_gl_border(struct wayland_output *output)
{
	int32_t ix, iy, iwidth, iheight, fwidth, fheight;
	cairo_t *cr;

	if (!output->frame)
		return;
	if (!(frame_status(output->frame) & FRAME_STATUS_REPAINT))
		return;

	fwidth = frame_width(output->frame);
	fheight = frame_height(output->frame);
	frame_interior(output->frame, &ix, &iy, &iwidth, &iheight);

	if (!output->gl.border.top)
		output->gl.border.top =
			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
						   fwidth, iy);
	cr = cairo_create(output->gl.border.top);
	frame_repaint(output->frame, cr);
	cairo_destroy(cr);
	gl_renderer->output_set_border(&output->base, GL_RENDERER_BORDER_TOP,
				       fwidth, iy,
				       cairo_image_surface_get_stride(output->gl.border.top) / 4,
				       cairo_image_surface_get_data(output->gl.border.top));


	if (!output->gl.border.left)
		output->gl.border.left =
			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
						   ix, 1);
	cr = cairo_create(output->gl.border.left);
	cairo_translate(cr, 0, -iy);
	frame_repaint(output->frame, cr);
	cairo_destroy(cr);
	gl_renderer->output_set_border(&output->base, GL_RENDERER_BORDER_LEFT,
				       ix, 1,
				       cairo_image_surface_get_stride(output->gl.border.left) / 4,
				       cairo_image_surface_get_data(output->gl.border.left));


	if (!output->gl.border.right)
		output->gl.border.right =
			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
						   fwidth - (ix + iwidth), 1);
	cr = cairo_create(output->gl.border.right);
	cairo_translate(cr, -(iwidth + ix), -iy);
	frame_repaint(output->frame, cr);
	cairo_destroy(cr);
	gl_renderer->output_set_border(&output->base, GL_RENDERER_BORDER_RIGHT,
				       fwidth - (ix + iwidth), 1,
				       cairo_image_surface_get_stride(output->gl.border.right) / 4,
				       cairo_image_surface_get_data(output->gl.border.right));


	if (!output->gl.border.bottom)
		output->gl.border.bottom =
			cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
						   fwidth, fheight - (iy + iheight));
	cr = cairo_create(output->gl.border.bottom);
	cairo_translate(cr, 0, -(iy + iheight));
	frame_repaint(output->frame, cr);
	cairo_destroy(cr);
	gl_renderer->output_set_border(&output->base, GL_RENDERER_BORDER_BOTTOM,
				       fwidth, fheight - (iy + iheight),
				       cairo_image_surface_get_stride(output->gl.border.bottom) / 4,
				       cairo_image_surface_get_data(output->gl.border.bottom));
}

static void
wayland_output_start_repaint_loop(struct weston_output *output_base)
{
	struct wayland_output *output = (struct wayland_output *) output_base;
	struct wayland_backend *wb =
		(struct wayland_backend *)output->base.compositor->backend;
	struct wl_callback *callback;

	/* If this is the initial frame, we need to attach a buffer so that
	 * the compositor can map the surface and include it in its render
	 * loop. If the surface doesn't end up in the render loop, the frame
	 * callback won't be invoked. The buffer is transparent and of the
	 * same size as the future real output buffer. */
	if (output->parent.draw_initial_frame) {
		output->parent.draw_initial_frame = 0;

		draw_initial_frame(output);
	}

	callback = wl_surface_frame(output->parent.surface);
	wl_callback_add_listener(callback, &frame_listener, output);
	wl_surface_commit(output->parent.surface);
	wl_display_flush(wb->parent.wl_display);
}

static int
wayland_output_repaint_gl(struct weston_output *output_base,
			  pixman_region32_t *damage)
{
	struct wayland_output *output = (struct wayland_output *) output_base;
	struct weston_compositor *ec = output->base.compositor;
	struct wl_callback *callback;

	callback = wl_surface_frame(output->parent.surface);
	wl_callback_add_listener(callback, &frame_listener, output);

	wayland_output_update_gl_border(output);

	ec->renderer->repaint_output(&output->base, damage);

	pixman_region32_subtract(&ec->primary_plane.damage,
				 &ec->primary_plane.damage, damage);
	return 0;
}

static void
wayland_output_update_shm_border(struct wayland_shm_buffer *buffer)
{
	int32_t ix, iy, iwidth, iheight, fwidth, fheight;
	cairo_t *cr;

	if (!buffer->output->frame || !buffer->frame_damaged)
		return;

	cr = cairo_create(buffer->c_surface);

	frame_interior(buffer->output->frame, &ix, &iy, &iwidth, &iheight);
	fwidth = frame_width(buffer->output->frame);
	fheight = frame_height(buffer->output->frame);

	/* Set the clip so we don't unnecisaraly damage the surface */
	cairo_move_to(cr, ix, iy);
	cairo_rel_line_to(cr, iwidth, 0);
	cairo_rel_line_to(cr, 0, iheight);
	cairo_rel_line_to(cr, -iwidth, 0);
	cairo_line_to(cr, ix, iy);
	cairo_line_to(cr, 0, iy);
	cairo_line_to(cr, 0, fheight);
	cairo_line_to(cr, fwidth, fheight);
	cairo_line_to(cr, fwidth, 0);
	cairo_line_to(cr, 0, 0);
	cairo_line_to(cr, 0, iy);
	cairo_close_path(cr);
	cairo_clip(cr);

	/* Draw using a pattern so that the final result gets clipped */
	cairo_push_group(cr);
	frame_repaint(buffer->output->frame, cr);
	cairo_pop_group_to_source(cr);
	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
	cairo_paint(cr);

	cairo_destroy(cr);
}

static void
wayland_shm_buffer_attach(struct wayland_shm_buffer *sb)
{
	pixman_region32_t damage;
	pixman_box32_t *rects;
	int32_t ix, iy, iwidth, iheight, fwidth, fheight;
	int i, n;

	pixman_region32_init(&damage);
	weston_transformed_region(sb->output->base.width,
				  sb->output->base.height,
				  sb->output->base.transform,
				  sb->output->base.current_scale,
				  &sb->damage, &damage);

	if (sb->output->frame) {
		frame_interior(sb->output->frame, &ix, &iy, &iwidth, &iheight);
		fwidth = frame_width(sb->output->frame);
		fheight = frame_height(sb->output->frame);

		pixman_region32_translate(&damage, ix, iy);

		if (sb->frame_damaged) {
			pixman_region32_union_rect(&damage, &damage,
						   0, 0, fwidth, iy);
			pixman_region32_union_rect(&damage, &damage,
						   0, iy, ix, iheight);
			pixman_region32_union_rect(&damage, &damage,
						   ix + iwidth, iy,
						   fwidth - (ix + iwidth), iheight);
			pixman_region32_union_rect(&damage, &damage,
						   0, iy + iheight,
						   fwidth, fheight - (iy + iheight));
		}
	}

	rects = pixman_region32_rectangles(&damage, &n);
	wl_surface_attach(sb->output->parent.surface, sb->buffer, 0, 0);
	for (i = 0; i < n; ++i)
		wl_surface_damage(sb->output->parent.surface, rects[i].x1,
				  rects[i].y1, rects[i].x2 - rects[i].x1,
				  rects[i].y2 - rects[i].y1);

	if (sb->output->frame)
		pixman_region32_fini(&damage);
}

static int
wayland_output_repaint_pixman(struct weston_output *output_base,
			      pixman_region32_t *damage)
{
	struct wayland_output *output = (struct wayland_output *) output_base;
	struct wayland_backend *b =
		(struct wayland_backend *)output->base.compositor->backend;
	struct wl_callback *callback;
	struct wayland_shm_buffer *sb;

	if (output->frame) {
		if (frame_status(output->frame) & FRAME_STATUS_REPAINT)
			wl_list_for_each(sb, &output->shm.buffers, link)
				sb->frame_damaged = 1;
	}

	wl_list_for_each(sb, &output->shm.buffers, link)
		pixman_region32_union(&sb->damage, &sb->damage, damage);

	sb = wayland_output_get_shm_buffer(output);

	wayland_output_update_shm_border(sb);
	pixman_renderer_output_set_buffer(output_base, sb->pm_image);
	b->compositor->renderer->repaint_output(output_base, &sb->damage);

	wayland_shm_buffer_attach(sb);

	callback = wl_surface_frame(output->parent.surface);
	wl_callback_add_listener(callback, &frame_listener, output);
	wl_surface_commit(output->parent.surface);
	wl_display_flush(b->parent.wl_display);

	pixman_region32_fini(&sb->damage);
	pixman_region32_init(&sb->damage);
	sb->frame_damaged = 0;

	pixman_region32_subtract(&b->compositor->primary_plane.damage,
				 &b->compositor->primary_plane.damage, damage);
	return 0;
}

static void
wayland_output_destroy(struct weston_output *output_base)
{
	struct wayland_output *output = (struct wayland_output *) output_base;
	struct wayland_backend *b =
		(struct wayland_backend *) output->base.compositor->backend;

	if (b->use_pixman) {
		pixman_renderer_output_destroy(output_base);
	} else {
		gl_renderer->output_destroy(output_base);
	}

	wl_egl_window_destroy(output->gl.egl_window);
	wl_surface_destroy(output->parent.surface);
	if (output->parent.shell_surface)
		wl_shell_surface_destroy(output->parent.shell_surface);

	if (output->frame)
		frame_destroy(output->frame);

	cairo_surface_destroy(output->gl.border.top);
	cairo_surface_destroy(output->gl.border.left);
	cairo_surface_destroy(output->gl.border.right);
	cairo_surface_destroy(output->gl.border.bottom);

	weston_output_destroy(&output->base);
	free(output);

	return;
}

static const struct wl_shell_surface_listener shell_surface_listener;

static int
wayland_output_init_gl_renderer(struct wayland_output *output)
{
	int32_t fwidth = 0, fheight = 0;

	if (output->frame) {
		fwidth = frame_width(output->frame);
		fheight = frame_height(output->frame);
	} else {
		fwidth = output->base.current_mode->width;
		fheight = output->base.current_mode->height;
	}

	output->gl.egl_window =
		wl_egl_window_create(output->parent.surface,
				     fwidth, fheight);
	if (!output->gl.egl_window) {
		weston_log("failure to create wl_egl_window\n");
		return -1;
	}

	if (gl_renderer->output_create(&output->base,
				       output->gl.egl_window,
				       output->gl.egl_window,
				       gl_renderer->alpha_attribs,
				       NULL,
				       0) < 0)
		goto cleanup_window;

	return 0;

cleanup_window:
	wl_egl_window_destroy(output->gl.egl_window);
	return -1;
}

static int
wayland_output_init_pixman_renderer(struct wayland_output *output)
{
	return pixman_renderer_output_create(&output->base);
}

static void
wayland_output_resize_surface(struct wayland_output *output)
{
	struct wayland_backend *b =
		(struct wayland_backend *)output->base.compositor->backend;
	struct wayland_shm_buffer *buffer, *next;
	int32_t ix, iy, iwidth, iheight;
	int32_t width, height;
	struct wl_region *region;

	width = output->base.current_mode->width;
	height = output->base.current_mode->height;

	if (output->frame) {
		frame_resize_inside(output->frame, width, height);

		frame_input_rect(output->frame, &ix, &iy, &iwidth, &iheight);
		region = wl_compositor_create_region(b->parent.compositor);
		wl_region_add(region, ix, iy, iwidth, iheight);
		wl_surface_set_input_region(output->parent.surface, region);
		wl_region_destroy(region);

		frame_opaque_rect(output->frame, &ix, &iy, &iwidth, &iheight);
		region = wl_compositor_create_region(b->parent.compositor);
		wl_region_add(region, ix, iy, iwidth, iheight);
		wl_surface_set_opaque_region(output->parent.surface, region);
		wl_region_destroy(region);

		width = frame_width(output->frame);
		height = frame_height(output->frame);
	} else {
		region = wl_compositor_create_region(b->parent.compositor);
		wl_region_add(region, 0, 0, width, height);
		wl_surface_set_input_region(output->parent.surface, region);
		wl_region_destroy(region);

		region = wl_compositor_create_region(b->parent.compositor);
		wl_region_add(region, 0, 0, width, height);
		wl_surface_set_opaque_region(output->parent.surface, region);
		wl_region_destroy(region);
	}

	if (output->gl.egl_window) {
		wl_egl_window_resize(output->gl.egl_window,
				     width, height, 0, 0);

		/* These will need to be re-created due to the resize */
		gl_renderer->output_set_border(&output->base,
					       GL_RENDERER_BORDER_TOP,
					       0, 0, 0, NULL);
		cairo_surface_destroy(output->gl.border.top);
		output->gl.border.top = NULL;
		gl_renderer->output_set_border(&output->base,
					       GL_RENDERER_BORDER_LEFT,
					       0, 0, 0, NULL);
		cairo_surface_destroy(output->gl.border.left);
		output->gl.border.left = NULL;
		gl_renderer->output_set_border(&output->base,
					       GL_RENDERER_BORDER_RIGHT,
					       0, 0, 0, NULL);
		cairo_surface_destroy(output->gl.border.right);
		output->gl.border.right = NULL;
		gl_renderer->output_set_border(&output->base,
					       GL_RENDERER_BORDER_BOTTOM,
					       0, 0, 0, NULL);
		cairo_surface_destroy(output->gl.border.bottom);
		output->gl.border.bottom = NULL;
	}

	/* Throw away any remaining SHM buffers */
	wl_list_for_each_safe(buffer, next, &output->shm.free_buffers, free_link)
		wayland_shm_buffer_destroy(buffer);
	/* These will get thrown away when they get released */
	wl_list_for_each(buffer, &output->shm.buffers, link)
		buffer->output = NULL;
}

static int
wayland_output_set_windowed(struct wayland_output *output)
{
	struct wayland_backend *b =
		(struct wayland_backend *)output->base.compositor->backend;
	int tlen;
	char *title;

	if (output->frame)
		return 0;

	if (output->name) {
		tlen = strlen(output->name) + strlen(WINDOW_TITLE " - ");
		title = malloc(tlen + 1);
		if (!title)
			return -1;

		snprintf(title, tlen + 1, WINDOW_TITLE " - %s", output->name);
	} else {
		title = strdup(WINDOW_TITLE);
	}

	if (!b->theme) {
		b->theme = theme_create();
		if (!b->theme) {
			free(title);
			return -1;
		}
	}
	output->frame = frame_create(b->theme, 100, 100,
				     FRAME_BUTTON_CLOSE, title);
	free(title);
	if (!output->frame)
		return -1;

	if (output->keyboard_count)
		frame_set_flag(output->frame, FRAME_FLAG_ACTIVE);

	wayland_output_resize_surface(output);

	wl_shell_surface_set_toplevel(output->parent.shell_surface);

	return 0;
}

static void
wayland_output_set_fullscreen(struct wayland_output *output,
			      enum wl_shell_surface_fullscreen_method method,
			      uint32_t framerate, struct wl_output *target)
{
	struct wayland_backend *b =
		(struct wayland_backend *)output->base.compositor->backend;

	if (output->frame) {
		frame_destroy(output->frame);
		output->frame = NULL;
	}

	wayland_output_resize_surface(output);

	if (output->parent.shell_surface) {
		wl_shell_surface_set_fullscreen(output->parent.shell_surface,
						method, framerate, target);
	} else if (b->parent.fshell) {
		zwp_fullscreen_shell_v1_present_surface(b->parent.fshell,
							output->parent.surface,
							method, target);
	}
}

static struct weston_mode *
wayland_output_choose_mode(struct wayland_output *output,
			   struct weston_mode *ref_mode)
{
	struct weston_mode *mode;

	/* First look for an exact match */
	wl_list_for_each(mode, &output->base.mode_list, link)
		if (mode->width == ref_mode->width &&
		    mode->height == ref_mode->height &&
		    mode->refresh == ref_mode->refresh)
			return mode;

	/* If we can't find an exact match, ignore refresh and try again */
	wl_list_for_each(mode, &output->base.mode_list, link)
		if (mode->width == ref_mode->width &&
		    mode->height == ref_mode->height)
			return mode;

	/* Yeah, we failed */
	return NULL;
}

enum mode_status {
	MODE_STATUS_UNKNOWN,
	MODE_STATUS_SUCCESS,
	MODE_STATUS_FAIL,
	MODE_STATUS_CANCEL,
};

static void
mode_feedback_successful(void *data,
			 struct zwp_fullscreen_shell_mode_feedback_v1 *fb)
{
	enum mode_status *value = data;

	printf("Mode switch successful\n");

	*value = MODE_STATUS_SUCCESS;
}

static void
mode_feedback_failed(void *data, struct zwp_fullscreen_shell_mode_feedback_v1 *fb)
{
	enum mode_status *value = data;

	printf("Mode switch failed\n");

	*value = MODE_STATUS_FAIL;
}

static void
mode_feedback_cancelled(void *data, struct zwp_fullscreen_shell_mode_feedback_v1 *fb)
{
	enum mode_status *value = data;

	printf("Mode switch cancelled\n");

	*value = MODE_STATUS_CANCEL;
}

struct zwp_fullscreen_shell_mode_feedback_v1_listener mode_feedback_listener = {
	mode_feedback_successful,
	mode_feedback_failed,
	mode_feedback_cancelled,
};

static int
wayland_output_switch_mode(struct weston_output *output_base,
			   struct weston_mode *mode)
{
	struct wayland_output *output = (struct wayland_output *) output_base;
	struct wayland_backend *b;
	struct wl_surface *old_surface;
	struct weston_mode *old_mode;
	struct zwp_fullscreen_shell_mode_feedback_v1 *mode_feedback;
	enum mode_status mode_status;
	int ret = 0;

	if (output_base == NULL) {
		weston_log("output is NULL.\n");
		return -1;
	}

	if (mode == NULL) {
		weston_log("mode is NULL.\n");
		return -1;
	}

	b = (struct wayland_backend *)output_base->compositor->backend;

	if (output->parent.shell_surface || !b->parent.fshell)
		return -1;

	mode = wayland_output_choose_mode(output, mode);
	if (mode == NULL)
		return -1;

	if (output->base.current_mode == mode)
		return 0;

	old_mode = output->base.current_mode;
	old_surface = output->parent.surface;
	output->base.current_mode = mode;
	output->parent.surface =
		wl_compositor_create_surface(b->parent.compositor);
	wl_surface_set_user_data(output->parent.surface, output);

	/* Blow the old buffers because we changed size/surfaces */
	wayland_output_resize_surface(output);

	mode_feedback =
		zwp_fullscreen_shell_v1_present_surface_for_mode(b->parent.fshell,
								 output->parent.surface,
								 output->parent.output,
								 mode->refresh);
	zwp_fullscreen_shell_mode_feedback_v1_add_listener(mode_feedback,
							   &mode_feedback_listener,
							   &mode_status);

	/* This should kick-start things again */
	output->parent.draw_initial_frame = 1;
	wayland_output_start_repaint_loop(&output->base);

	mode_status = MODE_STATUS_UNKNOWN;
	while (mode_status == MODE_STATUS_UNKNOWN && ret >= 0)
		ret = wl_display_dispatch(b->parent.wl_display);

	zwp_fullscreen_shell_mode_feedback_v1_destroy(mode_feedback);

	if (mode_status == MODE_STATUS_FAIL) {
		output->base.current_mode = old_mode;
		wl_surface_destroy(output->parent.surface);
		output->parent.surface = old_surface;
		wayland_output_resize_surface(output);

		return -1;
	}

	old_mode->flags &= ~WL_OUTPUT_MODE_CURRENT;
	output->base.current_mode->flags |= WL_OUTPUT_MODE_CURRENT;

	if (b->use_pixman) {
		pixman_renderer_output_destroy(output_base);
		if (wayland_output_init_pixman_renderer(output) < 0)
			goto err_output;
	} else {
		gl_renderer->output_destroy(output_base);
		wl_egl_window_destroy(output->gl.egl_window);
		if (wayland_output_init_gl_renderer(output) < 0)
			goto err_output;
	}
	wl_surface_destroy(old_surface);

	weston_output_schedule_repaint(&output->base);

	return 0;

err_output:
	/* XXX */
	return -1;
}

static struct wayland_output *
wayland_output_create(struct wayland_backend *b, int x, int y,
		      int width, int height, const char *name, int fullscreen,
		      uint32_t transform, int32_t scale)
{
	struct wayland_output *output;
	int output_width, output_height;

	weston_log("Creating %dx%d wayland output at (%d, %d)\n",
		   width, height, x, y);

	output = zalloc(sizeof *output);
	if (output == NULL)
		return NULL;

	output->name = name ? strdup(name) : NULL;
	output->base.make = "waywayland";
	output->base.model = "none";

	output_width = width * scale;
	output_height = height * scale;

	output->parent.surface =
		wl_compositor_create_surface(b->parent.compositor);
	if (!output->parent.surface)
		goto err_name;
	wl_surface_set_user_data(output->parent.surface, output);

	output->parent.draw_initial_frame = 1;

	if (b->parent.shell) {
		output->parent.shell_surface =
			wl_shell_get_shell_surface(b->parent.shell,
						   output->parent.surface);
		if (!output->parent.shell_surface)
			goto err_surface;
		wl_shell_surface_add_listener(output->parent.shell_surface,
					      &shell_surface_listener, output);
	}

	if (fullscreen && b->parent.shell) {
		wl_shell_surface_set_fullscreen(output->parent.shell_surface,
						0, 0, NULL);
		wl_display_roundtrip(b->parent.wl_display);
		if (!width)
			output_width = output->parent.configure_width;
		if (!height)
			output_height = output->parent.configure_height;
	}

	output->mode.flags =
		WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
	output->mode.width = output_width;
	output->mode.height = output_height;
	output->mode.refresh = 60000;
	output->scale = scale;
	wl_list_init(&output->base.mode_list);
	wl_list_insert(&output->base.mode_list, &output->mode.link);
	output->base.current_mode = &output->mode;

	wl_list_init(&output->shm.buffers);
	wl_list_init(&output->shm.free_buffers);

	weston_output_init(&output->base, b->compositor, x, y, width, height,
			   transform, scale);

	if (b->use_pixman) {
		if (wayland_output_init_pixman_renderer(output) < 0)
			goto err_output;
		output->base.repaint = wayland_output_repaint_pixman;
	} else {
		if (wayland_output_init_gl_renderer(output) < 0)
			goto err_output;
		output->base.repaint = wayland_output_repaint_gl;
	}

	output->base.start_repaint_loop = wayland_output_start_repaint_loop;
	output->base.destroy = wayland_output_destroy;
	output->base.assign_planes = NULL;
	output->base.set_backlight = NULL;
	output->base.set_dpms = NULL;
	output->base.switch_mode = wayland_output_switch_mode;

	weston_compositor_add_output(b->compositor, &output->base);

	return output;

err_output:
	weston_output_destroy(&output->base);
	if (output->parent.shell_surface)
		wl_shell_surface_destroy(output->parent.shell_surface);
err_surface:
	wl_surface_destroy(output->parent.surface);
err_name:
	free(output->name);

	/* FIXME: cleanup weston_output */
	free(output);

	return NULL;
}

static struct wayland_output *
wayland_output_create_for_config(struct wayland_backend *b,
				 struct weston_config_section *config_section,
				 int option_width, int option_height,
				 int option_scale, int32_t x, int32_t y)
{
	struct wayland_output *output;
	char *mode, *t, *name, *str;
	int width, height, scale;
	uint32_t transform;
	unsigned int slen;

	weston_config_section_get_string(config_section, "name", &name, NULL);
	if (name) {
		slen = strlen(name);
		slen += strlen(WINDOW_TITLE " - ");
		str = malloc(slen + 1);
		if (str)
			snprintf(str, slen + 1, WINDOW_TITLE " - %s", name);
		free(name);
		name = str;
	}
	if (!name)
		name = strdup(WINDOW_TITLE);

	weston_config_section_get_string(config_section,
					 "mode", &mode, "1024x600");
	if (sscanf(mode, "%dx%d", &width, &height) != 2) {
		weston_log("Invalid mode \"%s\" for output %s\n",
			   mode, name);
		width = 1024;
		height = 640;
	}
	free(mode);

	if (option_width)
		width = option_width;
	if (option_height)
		height = option_height;

	weston_config_section_get_int(config_section, "scale", &scale, 1);

	if (option_scale)
		scale = option_scale;

	weston_config_section_get_string(config_section,
					 "transform", &t, "normal");
	if (weston_parse_transform(t, &transform) < 0)
		weston_log("Invalid transform \"%s\" for output %s\n",
			   t, name);
	free(t);

	output = wayland_output_create(b, x, y, width, height, name, 0,
				       transform, scale);
	free(name);

	return output;
}

static struct wayland_output *
wayland_output_create_for_parent_output(struct wayland_backend *b,
					struct wayland_parent_output *poutput)
{
	struct wayland_output *output;
	struct weston_mode *mode;
	int32_t x;

	if (poutput->current_mode) {
		mode = poutput->current_mode;
	} else if (poutput->preferred_mode) {
		mode = poutput->preferred_mode;
	} else if (!wl_list_empty(&poutput->mode_list)) {
		mode = container_of(poutput->mode_list.next,
				    struct weston_mode, link);
	} else {
		weston_log("No valid modes found.  Skipping output\n");
		return NULL;
	}

	if (!wl_list_empty(&b->compositor->output_list)) {
		output = container_of(b->compositor->output_list.prev,
				      struct wayland_output, base.link);
		x = output->base.x + output->base.current_mode->width;
	} else {
		x = 0;
	}

	output = wayland_output_create(b, x, 0, mode->width, mode->height,
				       NULL, 0,
				       WL_OUTPUT_TRANSFORM_NORMAL, 1);
	if (!output)
		return NULL;

	output->parent.output = poutput->global;

	output->base.make = poutput->physical.make;
	output->base.model = poutput->physical.model;
	wl_list_init(&output->base.mode_list);
	wl_list_insert_list(&output->base.mode_list, &poutput->mode_list);
	wl_list_init(&poutput->mode_list);

	wayland_output_set_fullscreen(output,
				      WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER,
				      mode->refresh, poutput->global);

	if (output->parent.shell_surface) {
		wl_shell_surface_set_fullscreen(output->parent.shell_surface,
						WL_SHELL_SURFACE_FULLSCREEN_METHOD_DRIVER,
						mode->refresh, poutput->global);
	} else if (b->parent.fshell) {
		zwp_fullscreen_shell_v1_present_surface(b->parent.fshell,
							output->parent.surface,
							ZWP_FULLSCREEN_SHELL_V1_PRESENT_METHOD_CENTER,
							poutput->global);
		zwp_fullscreen_shell_mode_feedback_v1_destroy(
			zwp_fullscreen_shell_v1_present_surface_for_mode(b->parent.fshell,
									 output->parent.surface,
									 poutput->global,
									 mode->refresh));
	}

	return output;
}

static void
shell_surface_ping(void *data, struct wl_shell_surface *shell_surface,
		   uint32_t serial)
{
	wl_shell_surface_pong(shell_surface, serial);
}

static void
shell_surface_configure(void *data, struct wl_shell_surface *shell_surface,
			uint32_t edges, int32_t width, int32_t height)
{
	struct wayland_output *output = data;

	output->parent.configure_width = width;
	output->parent.configure_height = height;

	/* FIXME: implement resizing */
}

static void
shell_surface_popup_done(void *data, struct wl_shell_surface *shell_surface)
{
}

static const struct wl_shell_surface_listener shell_surface_listener = {
	shell_surface_ping,
	shell_surface_configure,
	shell_surface_popup_done
};

/* Events received from the wayland-server this compositor is client of: */

/* parent input interface */
static void
input_set_cursor(struct wayland_input *input)
{

	struct wl_buffer *buffer;
	struct wl_cursor_image *image;

	if (!input->backend->cursor)
		return; /* Couldn't load the cursor. Can't set it */

	image = input->backend->cursor->images[0];
	buffer = wl_cursor_image_get_buffer(image);
	if (!buffer)
		return;

	wl_pointer_set_cursor(input->parent.pointer, input->enter_serial,
			      input->parent.cursor.surface,
			      image->hotspot_x, image->hotspot_y);

	wl_surface_attach(input->parent.cursor.surface, buffer, 0, 0);
	wl_surface_damage(input->parent.cursor.surface, 0, 0,
			  image->width, image->height);
	wl_surface_commit(input->parent.cursor.surface);
}

static void
input_handle_pointer_enter(void *data, struct wl_pointer *pointer,
			   uint32_t serial, struct wl_surface *surface,
			   wl_fixed_t x, wl_fixed_t y)
{
	struct wayland_input *input = data;
	int32_t fx, fy;
	enum theme_location location;

	/* XXX: If we get a modifier event immediately before the focus,
	 *      we should try to keep the same serial. */
	input->enter_serial = serial;
	input->output = wl_surface_get_user_data(surface);

	if (input->output->frame) {
		location = frame_pointer_enter(input->output->frame, input,
					       wl_fixed_to_int(x),
					       wl_fixed_to_int(y));
		frame_interior(input->output->frame, &fx, &fy, NULL, NULL);
		x -= wl_fixed_from_int(fx);
		y -= wl_fixed_from_int(fy);

		if (frame_status(input->output->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&input->output->base);
	} else {
		location = THEME_LOCATION_CLIENT_AREA;
	}

	weston_output_transform_coordinate(&input->output->base, x, y, &x, &y);

	if (location == THEME_LOCATION_CLIENT_AREA) {
		input->has_focus = true;
		notify_pointer_focus(&input->base, &input->output->base, x, y);
		wl_pointer_set_cursor(input->parent.pointer,
				      input->enter_serial, NULL, 0, 0);
	} else {
		input->has_focus = false;
		notify_pointer_focus(&input->base, NULL, 0, 0);
		input_set_cursor(input);
	}
}

static void
input_handle_pointer_leave(void *data, struct wl_pointer *pointer,
			   uint32_t serial, struct wl_surface *surface)
{
	struct wayland_input *input = data;

	if (!input->output)
		return;

	if (input->output->frame) {
		frame_pointer_leave(input->output->frame, input);

		if (frame_status(input->output->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&input->output->base);
	}

	notify_pointer_focus(&input->base, NULL, 0, 0);
	input->output = NULL;
	input->has_focus = false;
}

static void
input_handle_motion(void *data, struct wl_pointer *pointer,
		    uint32_t time, wl_fixed_t x, wl_fixed_t y)
{
	struct wayland_input *input = data;
	int32_t fx, fy;
	enum theme_location location;

	if (!input->output)
		return;

	if (input->output->frame) {
		location = frame_pointer_motion(input->output->frame, input,
						wl_fixed_to_int(x),
						wl_fixed_to_int(y));
		frame_interior(input->output->frame, &fx, &fy, NULL, NULL);
		x -= wl_fixed_from_int(fx);
		y -= wl_fixed_from_int(fy);

		if (frame_status(input->output->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&input->output->base);
	} else {
		location = THEME_LOCATION_CLIENT_AREA;
	}

	weston_output_transform_coordinate(&input->output->base, x, y, &x, &y);

	if (input->has_focus && location != THEME_LOCATION_CLIENT_AREA) {
		input_set_cursor(input);
		notify_pointer_focus(&input->base, NULL, 0, 0);
		input->has_focus = false;
	} else if (!input->has_focus &&
		   location == THEME_LOCATION_CLIENT_AREA) {
		wl_pointer_set_cursor(input->parent.pointer,
				      input->enter_serial, NULL, 0, 0);
		notify_pointer_focus(&input->base, &input->output->base, x, y);
		input->has_focus = true;
	}

	if (location == THEME_LOCATION_CLIENT_AREA)
		notify_motion_absolute(&input->base, time, x, y);
}

static void
input_handle_button(void *data, struct wl_pointer *pointer,
		    uint32_t serial, uint32_t time, uint32_t button,
		    uint32_t state_w)
{
	struct wayland_input *input = data;
	enum wl_pointer_button_state state = state_w;
	enum frame_button_state fstate;
	enum theme_location location;

	if (!input->output)
		return;

	if (input->output->frame) {
		fstate = state == WL_POINTER_BUTTON_STATE_PRESSED ?
			FRAME_BUTTON_PRESSED : FRAME_BUTTON_RELEASED;

		location = frame_pointer_button(input->output->frame, input,
						button, fstate);

		if (frame_status(input->output->frame) & FRAME_STATUS_MOVE) {

			wl_shell_surface_move(input->output->parent.shell_surface,
					      input->parent.seat, serial);
			frame_status_clear(input->output->frame,
					   FRAME_STATUS_MOVE);
			return;
		}

		if (frame_status(input->output->frame) & FRAME_STATUS_CLOSE) {
			wayland_output_destroy(&input->output->base);
			input->output = NULL;
			input->keyboard_focus = NULL;

			if (wl_list_empty(&input->backend->compositor->output_list))
				weston_compositor_exit(input->backend->compositor);

			return;
		}

		if (frame_status(input->output->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&input->output->base);
	} else {
		location = THEME_LOCATION_CLIENT_AREA;
	}

	if (location == THEME_LOCATION_CLIENT_AREA)
		notify_button(&input->base, time, button, state);
}

static void
input_handle_axis(void *data, struct wl_pointer *pointer,
		  uint32_t time, uint32_t axis, wl_fixed_t value)
{
	struct wayland_input *input = data;

	notify_axis(&input->base, time, axis, value);
}

static const struct wl_pointer_listener pointer_listener = {
	input_handle_pointer_enter,
	input_handle_pointer_leave,
	input_handle_motion,
	input_handle_button,
	input_handle_axis,
};

static void
input_handle_keymap(void *data, struct wl_keyboard *keyboard, uint32_t format,
		    int fd, uint32_t size)
{
	struct wayland_input *input = data;
	struct xkb_keymap *keymap;
	char *map_str;

	if (!data) {
		close(fd);
		return;
	}

	if (format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
		map_str = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
		if (map_str == MAP_FAILED) {
			weston_log("mmap failed: %m\n");
			goto error;
		}

		keymap = xkb_keymap_new_from_string(input->backend->compositor->xkb_context,
						    map_str,
						    XKB_KEYMAP_FORMAT_TEXT_V1,
						    0);
		munmap(map_str, size);

		if (!keymap) {
			weston_log("failed to compile keymap\n");
			goto error;
		}

		input->keyboard_state_update = STATE_UPDATE_NONE;
	} else if (format == WL_KEYBOARD_KEYMAP_FORMAT_NO_KEYMAP) {
		weston_log("No keymap provided; falling back to defalt\n");
		keymap = NULL;
		input->keyboard_state_update = STATE_UPDATE_AUTOMATIC;
	} else {
		weston_log("Invalid keymap\n");
		goto error;
	}

	close(fd);

	if (weston_seat_get_keyboard(&input->base))
		weston_seat_update_keymap(&input->base, keymap);
	else
		weston_seat_init_keyboard(&input->base, keymap);

	xkb_keymap_unref(keymap);

	return;

error:
	wl_keyboard_release(input->parent.keyboard);
	close(fd);
}

static void
input_handle_keyboard_enter(void *data,
			    struct wl_keyboard *keyboard,
			    uint32_t serial,
			    struct wl_surface *surface,
			    struct wl_array *keys)
{
	struct wayland_input *input = data;
	struct wayland_output *focus;

	focus = input->keyboard_focus;
	if (focus) {
		/* This shouldn't happen */
		focus->keyboard_count--;
		if (!focus->keyboard_count && focus->frame)
			frame_unset_flag(focus->frame, FRAME_FLAG_ACTIVE);
		if (frame_status(focus->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&focus->base);
	}

	input->keyboard_focus = wl_surface_get_user_data(surface);
	input->keyboard_focus->keyboard_count++;

	focus = input->keyboard_focus;
	if (focus->frame) {
		frame_set_flag(focus->frame, FRAME_FLAG_ACTIVE);
		if (frame_status(focus->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&focus->base);
	}


	/* XXX: If we get a modifier event immediately before the focus,
	 *      we should try to keep the same serial. */
	notify_keyboard_focus_in(&input->base, keys,
				 STATE_UPDATE_AUTOMATIC);
}

static void
input_handle_keyboard_leave(void *data,
			    struct wl_keyboard *keyboard,
			    uint32_t serial,
			    struct wl_surface *surface)
{
	struct wayland_input *input = data;
	struct wayland_output *focus;

	notify_keyboard_focus_out(&input->base);

	focus = input->keyboard_focus;
	if (!focus)
		return;

	focus->keyboard_count--;
	if (!focus->keyboard_count && focus->frame) {
		frame_unset_flag(focus->frame, FRAME_FLAG_ACTIVE);
		if (frame_status(focus->frame) & FRAME_STATUS_REPAINT)
			weston_output_schedule_repaint(&focus->base);
	}

	input->keyboard_focus = NULL;
}

static void
input_handle_key(void *data, struct wl_keyboard *keyboard,
		 uint32_t serial, uint32_t time, uint32_t key, uint32_t state)
{
	struct wayland_input *input = data;

	input->key_serial = serial;
	notify_key(&input->base, time, key,
		   state ? WL_KEYBOARD_KEY_STATE_PRESSED :
			   WL_KEYBOARD_KEY_STATE_RELEASED,
		   input->keyboard_state_update);
}

static void
input_handle_modifiers(void *data, struct wl_keyboard *wl_keyboard,
		       uint32_t serial_in, uint32_t mods_depressed,
		       uint32_t mods_latched, uint32_t mods_locked,
		       uint32_t group)
{
	struct weston_keyboard *keyboard;
	struct wayland_input *input = data;
	struct wayland_backend *b = input->backend;
	uint32_t serial_out;

	/* If we get a key event followed by a modifier event with the
	 * same serial number, then we try to preserve those semantics by
	 * reusing the same serial number on the way out too. */
	if (serial_in == input->key_serial)
		serial_out = wl_display_get_serial(b->compositor->wl_display);
	else
		serial_out = wl_display_next_serial(b->compositor->wl_display);

	keyboard = weston_seat_get_keyboard(&input->base);
	xkb_state_update_mask(keyboard->xkb_state.state,
			      mods_depressed, mods_latched,
			      mods_locked, 0, 0, group);
	notify_modifiers(&input->base, serial_out);
}

static void
input_handle_repeat_info(void *data, struct wl_keyboard *keyboard,
			 int32_t rate, int32_t delay)
{
	struct wayland_input *input = data;
	struct wayland_backend *b = input->backend;

	b->compositor->kb_repeat_rate = rate;
	b->compositor->kb_repeat_delay = delay;
}

static const struct wl_keyboard_listener keyboard_listener = {
	input_handle_keymap,
	input_handle_keyboard_enter,
	input_handle_keyboard_leave,
	input_handle_key,
	input_handle_modifiers,
	input_handle_repeat_info,
};

static void
input_handle_capabilities(void *data, struct wl_seat *seat,
		          enum wl_seat_capability caps)
{
	struct wayland_input *input = data;

	if ((caps & WL_SEAT_CAPABILITY_POINTER) && !input->parent.pointer) {
		input->parent.pointer = wl_seat_get_pointer(seat);
		wl_pointer_set_user_data(input->parent.pointer, input);
		wl_pointer_add_listener(input->parent.pointer,
					&pointer_listener, input);
		weston_seat_init_pointer(&input->base);
	} else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && input->parent.pointer) {
		if (input->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION)
			wl_pointer_release(input->parent.pointer);
		else
			wl_pointer_destroy(input->parent.pointer);
		input->parent.pointer = NULL;
		weston_seat_release_pointer(&input->base);
	}

	if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !input->parent.keyboard) {
		input->parent.keyboard = wl_seat_get_keyboard(seat);
		wl_keyboard_set_user_data(input->parent.keyboard, input);
		wl_keyboard_add_listener(input->parent.keyboard,
					 &keyboard_listener, input);
	} else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && input->parent.keyboard) {
		if (input->seat_version >= WL_KEYBOARD_RELEASE_SINCE_VERSION)
			wl_keyboard_release(input->parent.keyboard);
		else
			wl_keyboard_destroy(input->parent.keyboard);
		input->parent.keyboard = NULL;
		weston_seat_release_keyboard(&input->base);
	}
}

static void
input_handle_name(void *data, struct wl_seat *seat,
		  const char *name)
{
}

static const struct wl_seat_listener seat_listener = {
	input_handle_capabilities,
	input_handle_name,
};

static void
display_add_seat(struct wayland_backend *b, uint32_t id, uint32_t available_version)
{
	struct wayland_input *input;
	uint32_t version = MIN(available_version, 4);

	input = zalloc(sizeof *input);
	if (input == NULL)
		return;

	weston_seat_init(&input->base, b->compositor, "default");
	input->backend = b;
	input->parent.seat = wl_registry_bind(b->parent.registry, id,
					      &wl_seat_interface, version);
	input->seat_version = version;
	wl_list_insert(b->input_list.prev, &input->link);

	wl_seat_add_listener(input->parent.seat, &seat_listener, input);
	wl_seat_set_user_data(input->parent.seat, input);

	input->parent.cursor.surface =
		wl_compositor_create_surface(b->parent.compositor);
}

static void
wayland_parent_output_geometry(void *data, struct wl_output *output_proxy,
			       int32_t x, int32_t y,
			       int32_t physical_width, int32_t physical_height,
			       int32_t subpixel, const char *make,
			       const char *model, int32_t transform)
{
	struct wayland_parent_output *output = data;

	output->x = x;
	output->y = y;
	output->physical.width = physical_width;
	output->physical.height = physical_height;
	output->physical.subpixel = subpixel;

	free(output->physical.make);
	output->physical.make = strdup(make);
	free(output->physical.model);
	output->physical.model = strdup(model);

	output->transform = transform;
}

static struct weston_mode *
find_mode(struct wl_list *list, int32_t width, int32_t height, uint32_t refresh)
{
	struct weston_mode *mode;

	wl_list_for_each(mode, list, link) {
		if (mode->width == width && mode->height == height &&
		    mode->refresh == refresh)
			return mode;
	}

	mode = zalloc(sizeof *mode);
	if (!mode)
		return NULL;

	mode->width = width;
	mode->height = height;
	mode->refresh = refresh;
	wl_list_insert(list, &mode->link);

	return mode;
}

static void
wayland_parent_output_mode(void *data, struct wl_output *wl_output_proxy,
			   uint32_t flags, int32_t width, int32_t height,
			   int32_t refresh)
{
	struct wayland_parent_output *output = data;
	struct weston_mode *mode;

	if (output->output) {
		mode = find_mode(&output->output->base.mode_list,
				 width, height, refresh);
		if (!mode)
			return;
		mode->flags = flags;
		/* Do a mode-switch on current mode change? */
	} else {
		mode = find_mode(&output->mode_list, width, height, refresh);
		if (!mode)
			return;
		mode->flags = flags;
		if (flags & WL_OUTPUT_MODE_CURRENT)
			output->current_mode = mode;
		if (flags & WL_OUTPUT_MODE_PREFERRED)
			output->preferred_mode = mode;
	}
}

static const struct wl_output_listener output_listener = {
	wayland_parent_output_geometry,
	wayland_parent_output_mode
};

static void
wayland_backend_register_output(struct wayland_backend *b, uint32_t id)
{
	struct wayland_parent_output *output;

	output = zalloc(sizeof *output);
	if (!output)
		return;

	output->id = id;
	output->global = wl_registry_bind(b->parent.registry, id,
					  &wl_output_interface, 1);
	if (!output->global) {
		free(output);
		return;
	}

	wl_output_add_listener(output->global, &output_listener, output);

	output->scale = 0;
	output->transform = WL_OUTPUT_TRANSFORM_NORMAL;
	output->physical.subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
	wl_list_init(&output->mode_list);
	wl_list_insert(&b->parent.output_list, &output->link);

	if (b->sprawl_across_outputs) {
		wl_display_roundtrip(b->parent.wl_display);
		wayland_output_create_for_parent_output(b, output);
	}
}

static void
wayland_parent_output_destroy(struct wayland_parent_output *output)
{
	struct weston_mode *mode, *next;

	if (output->output)
		wayland_output_destroy(&output->output->base);

	wl_output_destroy(output->global);
	free(output->physical.make);
	free(output->physical.model);

	wl_list_for_each_safe(mode, next, &output->mode_list, link) {
		wl_list_remove(&mode->link);
		free(mode);
	}
}

static void
registry_handle_global(void *data, struct wl_registry *registry, uint32_t name,
		       const char *interface, uint32_t version)
{
	struct wayland_backend *b = data;

	if (strcmp(interface, "wl_compositor") == 0) {
		b->parent.compositor =
			wl_registry_bind(registry, name,
					 &wl_compositor_interface, 1);
	} else if (strcmp(interface, "wl_shell") == 0) {
		b->parent.shell =
			wl_registry_bind(registry, name,
					 &wl_shell_interface, 1);
	} else if (strcmp(interface, "zwp_fullscreen_shell_v1") == 0) {
		b->parent.fshell =
			wl_registry_bind(registry, name,
					 &zwp_fullscreen_shell_v1_interface, 1);
	} else if (strcmp(interface, "wl_seat") == 0) {
		display_add_seat(b, name, version);
	} else if (strcmp(interface, "wl_output") == 0) {
		wayland_backend_register_output(b, name);
	} else if (strcmp(interface, "wl_shm") == 0) {
		b->parent.shm =
			wl_registry_bind(registry, name, &wl_shm_interface, 1);
	}
}

static void
registry_handle_global_remove(void *data, struct wl_registry *registry,
			      uint32_t name)
{
	struct wayland_backend *b = data;
	struct wayland_parent_output *output;

	wl_list_for_each(output, &b->parent.output_list, link)
		if (output->id == name)
			wayland_parent_output_destroy(output);
}

static const struct wl_registry_listener registry_listener = {
	registry_handle_global,
	registry_handle_global_remove
};

static int
wayland_backend_handle_event(int fd, uint32_t mask, void *data)
{
	struct wayland_backend *b = data;
	int count = 0;

	if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
		weston_compositor_exit(b->compositor);
		return 0;
	}

	if (mask & WL_EVENT_READABLE)
		count = wl_display_dispatch(b->parent.wl_display);
	if (mask & WL_EVENT_WRITABLE)
		wl_display_flush(b->parent.wl_display);

	if (mask == 0) {
		count = wl_display_dispatch_pending(b->parent.wl_display);
		wl_display_flush(b->parent.wl_display);
	}

	return count;
}

static void
wayland_restore(struct weston_compositor *ec)
{
}

static void
wayland_destroy(struct weston_compositor *ec)
{
	struct wayland_backend *b = (struct wayland_backend *) ec->backend;

	weston_compositor_shutdown(ec);

	if (b->parent.shm)
		wl_shm_destroy(b->parent.shm);

	free(b);
}

static const char *left_ptrs[] = {
	"left_ptr",
	"default",
	"top_left_arrow",
	"left-arrow"
};

static void
create_cursor(struct wayland_backend *b, struct weston_config *config)
{
	struct weston_config_section *s;
	int size;
	char *theme = NULL;
	unsigned int i;

	s = weston_config_get_section(config, "shell", NULL, NULL);
	weston_config_section_get_string(s, "cursor-theme", &theme, NULL);
	weston_config_section_get_int(s, "cursor-size", &size, 32);

	b->cursor_theme = wl_cursor_theme_load(theme, size, b->parent.shm);
	if (!b->cursor_theme) {
		fprintf(stderr, "could not load cursor theme\n");
		return;
	}

	free(theme);

	b->cursor = NULL;
	for (i = 0; !b->cursor && i < ARRAY_LENGTH(left_ptrs); ++i)
		b->cursor = wl_cursor_theme_get_cursor(b->cursor_theme,
						       left_ptrs[i]);
	if (!b->cursor) {
		fprintf(stderr, "could not load left cursor\n");
		return;
	}
}

static void
fullscreen_binding(struct weston_keyboard *keyboard, uint32_t time,
		   uint32_t key, void *data)
{
	struct wayland_backend *b = data;
	struct wayland_input *input = NULL;

	wl_list_for_each(input, &b->input_list, link)
		if (&input->base == keyboard->seat)
			break;

	if (!input || !input->output)
		return;

	if (input->output->frame)
		wayland_output_set_fullscreen(input->output, 0, 0, NULL);
	else
		wayland_output_set_windowed(input->output);

	weston_output_schedule_repaint(&input->output->base);
}

static struct wayland_backend *
wayland_backend_create(struct weston_compositor *compositor, int use_pixman,
		       const char *display_name, int *argc, char *argv[],
		       struct weston_config *config)
{
	struct wayland_backend *b;
	struct wl_event_loop *loop;
	int fd;

	b = zalloc(sizeof *b);
	if (b == NULL)
		return NULL;

	b->compositor = compositor;
	if (weston_compositor_set_presentation_clock_software(compositor) < 0)
		goto err_compositor;

	b->parent.wl_display = wl_display_connect(display_name);
	if (b->parent.wl_display == NULL) {
		weston_log("failed to create display: %m\n");
		goto err_compositor;
	}

	wl_list_init(&b->parent.output_list);
	wl_list_init(&b->input_list);
	b->parent.registry = wl_display_get_registry(b->parent.wl_display);
	wl_registry_add_listener(b->parent.registry, &registry_listener, b);
	wl_display_roundtrip(b->parent.wl_display);

	create_cursor(b, config);

	b->use_pixman = use_pixman;

	if (!b->use_pixman) {
		gl_renderer = weston_load_module("gl-renderer.so",
						 "gl_renderer_interface");
		if (!gl_renderer)
			b->use_pixman = 1;
	}

	if (!b->use_pixman) {
		if (gl_renderer->create(compositor,
					EGL_PLATFORM_WAYLAND_KHR,
					b->parent.wl_display,
					gl_renderer->alpha_attribs,
					NULL,
					0) < 0) {
			weston_log("Failed to initialize the GL renderer; "
				   "falling back to pixman.\n");
			b->use_pixman = 1;
		}
	}

	if (b->use_pixman) {
		if (pixman_renderer_init(compositor) < 0) {
			weston_log("Failed to initialize pixman renderer\n");
			goto err_display;
		}
	}

	b->base.destroy = wayland_destroy;
	b->base.restore = wayland_restore;

	loop = wl_display_get_event_loop(compositor->wl_display);

	fd = wl_display_get_fd(b->parent.wl_display);
	b->parent.wl_source =
		wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
				     wayland_backend_handle_event, b);
	if (b->parent.wl_source == NULL)
		goto err_display;

	wl_event_source_check(b->parent.wl_source);

	if (compositor->renderer->import_dmabuf) {
		if (linux_dmabuf_setup(compositor) < 0)
			weston_log("Error: initializing dmabuf "
			           "support failed.\n");
	}

	compositor->backend = &b->base;
	return b;
err_display:
	wl_display_disconnect(b->parent.wl_display);
err_compositor:
	weston_compositor_shutdown(compositor);
	free(b);
	return NULL;
}

static void
wayland_backend_destroy(struct wayland_backend *b)
{
	wl_display_disconnect(b->parent.wl_display);

	if (b->theme)
		theme_destroy(b->theme);
	if (b->frame_device)
		cairo_device_destroy(b->frame_device);
	wl_cursor_theme_destroy(b->cursor_theme);

	weston_compositor_shutdown(b->compositor);
	free(b);
}

WL_EXPORT int
backend_init(struct weston_compositor *compositor, int *argc, char *argv[],
	     struct weston_config *config,
	     struct weston_backend_config *config_base)
{
	struct wayland_backend *b;
	struct wayland_output *output;
	struct wayland_parent_output *poutput;
	struct weston_config_section *section;
	int x, count, width, height, scale, use_pixman, fullscreen, sprawl;
	const char *section_name, *display_name;
	char *name;

	const struct weston_option wayland_options[] = {
		{ WESTON_OPTION_INTEGER, "width", 0, &width },
		{ WESTON_OPTION_INTEGER, "height", 0, &height },
		{ WESTON_OPTION_INTEGER, "scale", 0, &scale },
		{ WESTON_OPTION_STRING, "display", 0, &display_name },
		{ WESTON_OPTION_BOOLEAN, "use-pixman", 0, &use_pixman },
		{ WESTON_OPTION_INTEGER, "output-count", 0, &count },
		{ WESTON_OPTION_BOOLEAN, "fullscreen", 0, &fullscreen },
		{ WESTON_OPTION_BOOLEAN, "sprawl", 0, &sprawl },
	};

	width = 0;
	height = 0;
	scale = 0;
	display_name = NULL;
	use_pixman = 0;
	count = 1;
	fullscreen = 0;
	sprawl = 0;
	parse_options(wayland_options,
		      ARRAY_LENGTH(wayland_options), argc, argv);

	b = wayland_backend_create(compositor, use_pixman, display_name,
				   argc, argv, config);
	if (!b)
		return -1;

	if (sprawl || b->parent.fshell) {
		b->sprawl_across_outputs = 1;
		wl_display_roundtrip(b->parent.wl_display);

		wl_list_for_each(poutput, &b->parent.output_list, link)
			wayland_output_create_for_parent_output(b, poutput);

		return 0;
	}

	if (fullscreen) {
		output = wayland_output_create(b, 0, 0, width, height,
					       NULL, 1, 0, 1);
		if (!output)
			goto err_outputs;

		wayland_output_set_fullscreen(output, 0, 0, NULL);
		return 0;
	}

	section = NULL;
	x = 0;
	while (weston_config_next_section(config, &section, &section_name)) {
		if (!section_name || strcmp(section_name, "output") != 0)
			continue;
		weston_config_section_get_string(section, "name", &name, NULL);
		if (name == NULL)
			continue;

		if (name[0] != 'W' || name[1] != 'L') {
			free(name);
			continue;
		}
		free(name);

		output = wayland_output_create_for_config(b, section, width,
							  height, scale, x, 0);
		if (!output)
			goto err_outputs;
		if (wayland_output_set_windowed(output))
			goto err_outputs;

		x += output->base.width;
		--count;
	}

	if (!width)
		width = 1024;
	if (!height)
		height = 640;
	if (!scale)
		scale = 1;
	while (count > 0) {
		output = wayland_output_create(b, x, 0, width, height,
					       NULL, 0, 0, scale);
		if (!output)
			goto err_outputs;
		if (wayland_output_set_windowed(output))
			goto err_outputs;

		x += width;
		--count;
	}

	weston_compositor_add_key_binding(compositor, KEY_F,
				          MODIFIER_CTRL | MODIFIER_ALT,
				          fullscreen_binding, b);

	return 0;

err_outputs:
	wayland_backend_destroy(b);
	return -1;
}