vm_tools/sommelier/sommelier-output.c - mirrors/cros/chromiumos/platform2 - Git at Google

 // Copyright 2018 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "sommelier.h"

 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include <wayland-client.h>

 #include "aura-shell-client-protocol.h"

 #define MAX_OUTPUT_SCALE 2

 #define INCH_IN_MM 25.4

 double sl_output_aura_scale_factor_to_double(int scale_factor) {
   // Aura scale factor is an enum that for all currently know values
   // is a scale value multipled by 1000. For example, enum value for
   // 1.25 scale factor is 1250.
   return scale_factor / 1000.0;
 }

 void sl_output_get_host_output_state(struct sl_host_output* host,
                                      int* scale,
                                      int* physical_width,
                                      int* physical_height,
                                      int* width,
                                      int* height) {
   double preferred_scale =
       sl_output_aura_scale_factor_to_double(host->preferred_scale);
   double current_scale =
       sl_output_aura_scale_factor_to_double(host->current_scale);
   double ideal_scale_factor = 1.0;
   double scale_factor = host->scale_factor;

   // Use the scale factor we received from aura shell protocol when available.
   if (host->ctx->aura_shell) {
     double device_scale_factor =
         sl_output_aura_scale_factor_to_double(host->device_scale_factor);

     ideal_scale_factor = device_scale_factor * preferred_scale;
     scale_factor = device_scale_factor * current_scale;
   }

   // Always use scale=1 and adjust geometry and mode based on ideal
   // scale factor for Xwayland client. For other clients, pick an optimal
   // scale and adjust geometry and mode based on it.
   if (host->ctx->xwayland) {
     if (scale)
       *scale = 1;
     *physical_width = host->physical_width * ideal_scale_factor / scale_factor;
     *physical_height =
         host->physical_height * ideal_scale_factor / scale_factor;
     *width = host->width * host->ctx->scale / scale_factor;
     *height = host->height * host->ctx->scale / scale_factor;
   } else {
     int s = MIN(ceil(scale_factor / host->ctx->scale), MAX_OUTPUT_SCALE);

     if (scale)
       *scale = s;
     *physical_width = host->physical_width;
     *physical_height = host->physical_height;
     *width = host->width * host->ctx->scale * s / scale_factor;
     *height = host->height * host->ctx->scale * s / scale_factor;
   }

   if (host->ctx->dpi.size) {
     int dpi = (*width * INCH_IN_MM) / *physical_width;
     int adjusted_dpi = *((int*)host->ctx->dpi.data);
     double mmpd;
     int* p;

     wl_array_for_each(p, &host->ctx->dpi) {
       if (*p > dpi)
         break;

       adjusted_dpi = *p;
     }

     mmpd = INCH_IN_MM / adjusted_dpi;
     *physical_width = *width * mmpd + 0.5;
     *physical_height = *height * mmpd + 0.5;
   }
 }

 void sl_output_send_host_output_state(struct sl_host_output* host) {
   int scale;
   int physical_width;
   int physical_height;
   int width;
   int height;

   sl_output_get_host_output_state(host, &scale, &physical_width,
                                   &physical_height, &width, &height);

   // Use density of internal display for all Xwayland outputs. X11 clients
   // typically lack support for dynamically changing density so it's
   // preferred to always use the density of the internal display.
   if (host->ctx->xwayland) {
     struct sl_host_output* output;

     wl_list_for_each(output, &host->ctx->host_outputs, link) {
       if (output->internal) {
         int internal_width;
         int internal_height;

         sl_output_get_host_output_state(output, NULL, &physical_width,
                                         &physical_height, &internal_width,
                                         &internal_height);

         physical_width = (physical_width * width) / internal_width;
         physical_height = (physical_height * height) / internal_height;
         break;
       }
     }
   }

   // X/Y are best left at origin as managed X windows are kept centered on
   // the root window. The result is that all outputs are overlapping and
   // pointer events can always be dispatched to the visible region of the
   // window.
   wl_output_send_geometry(host->resource, 0, 0, physical_width, physical_height,
                           host->subpixel, host->make, host->model,
                           host->transform);
   wl_output_send_mode(host->resource, host->flags | WL_OUTPUT_MODE_CURRENT,
                       width, height, host->refresh);
   if (wl_resource_get_version(host->resource) >= WL_OUTPUT_SCALE_SINCE_VERSION)
     wl_output_send_scale(host->resource, scale);
   if (wl_resource_get_version(host->resource) >= WL_OUTPUT_DONE_SINCE_VERSION)
     wl_output_send_done(host->resource);
 }

 static void sl_output_geometry(void* data,
                                struct wl_output* output,
                                int x,
                                int y,
                                int physical_width,
                                int physical_height,
                                int subpixel,
                                const char* make,
                                const char* model,
                                int transform) {
   struct sl_host_output* host = wl_output_get_user_data(output);

   host->x = x;
   host->y = y;
   host->physical_width = physical_width;
   host->physical_height = physical_height;
   host->subpixel = subpixel;
   free(host->model);
   host->model = strdup(model);
   free(host->make);
   host->make = strdup(make);
   host->transform = transform;
 }

 static void sl_output_mode(void* data,
                            struct wl_output* output,
                            uint32_t flags,
                            int width,
                            int height,
                            int refresh) {
   struct sl_host_output* host = wl_output_get_user_data(output);

   host->flags = flags;
   host->width = width;
   host->height = height;
   host->refresh = refresh;
 }

 static void sl_output_done(void* data, struct wl_output* output) {
   struct sl_host_output* host = wl_output_get_user_data(output);

   // Early out if scale is expected but not yet know.
   if (host->expecting_scale)
     return;

   sl_output_send_host_output_state(host);

   // Expect scale if aura output exists.
   if (host->aura_output)
     host->expecting_scale = 1;
 }

 static void sl_output_scale(void* data,
                             struct wl_output* output,
                             int32_t scale_factor) {
   struct sl_host_output* host = wl_output_get_user_data(output);

   host->scale_factor = scale_factor;
 }

 static const struct wl_output_listener sl_output_listener = {
     sl_output_geometry, sl_output_mode, sl_output_done, sl_output_scale};

 static void sl_aura_output_scale(void* data,
                                  struct zaura_output* output,
                                  uint32_t flags,
                                  uint32_t scale) {
   struct sl_host_output* host = zaura_output_get_user_data(output);

   switch (scale) {
     case ZAURA_OUTPUT_SCALE_FACTOR_0400:
     case ZAURA_OUTPUT_SCALE_FACTOR_0500:
     case ZAURA_OUTPUT_SCALE_FACTOR_0550:
     case ZAURA_OUTPUT_SCALE_FACTOR_0600:
     case ZAURA_OUTPUT_SCALE_FACTOR_0625:
     case ZAURA_OUTPUT_SCALE_FACTOR_0650:
     case ZAURA_OUTPUT_SCALE_FACTOR_0700:
     case ZAURA_OUTPUT_SCALE_FACTOR_0750:
     case ZAURA_OUTPUT_SCALE_FACTOR_0800:
     case ZAURA_OUTPUT_SCALE_FACTOR_0850:
     case ZAURA_OUTPUT_SCALE_FACTOR_0900:
     case ZAURA_OUTPUT_SCALE_FACTOR_0950:
     case ZAURA_OUTPUT_SCALE_FACTOR_1000:
     case ZAURA_OUTPUT_SCALE_FACTOR_1050:
     case ZAURA_OUTPUT_SCALE_FACTOR_1100:
     case ZAURA_OUTPUT_SCALE_FACTOR_1150:
     case ZAURA_OUTPUT_SCALE_FACTOR_1125:
     case ZAURA_OUTPUT_SCALE_FACTOR_1200:
     case ZAURA_OUTPUT_SCALE_FACTOR_1250:
     case ZAURA_OUTPUT_SCALE_FACTOR_1300:
     case ZAURA_OUTPUT_SCALE_FACTOR_1400:
     case ZAURA_OUTPUT_SCALE_FACTOR_1450:
     case ZAURA_OUTPUT_SCALE_FACTOR_1500:
     case ZAURA_OUTPUT_SCALE_FACTOR_1600:
     case ZAURA_OUTPUT_SCALE_FACTOR_1750:
     case ZAURA_OUTPUT_SCALE_FACTOR_1800:
     case ZAURA_OUTPUT_SCALE_FACTOR_2000:
     case ZAURA_OUTPUT_SCALE_FACTOR_2200:
     case ZAURA_OUTPUT_SCALE_FACTOR_2250:
     case ZAURA_OUTPUT_SCALE_FACTOR_2500:
     case ZAURA_OUTPUT_SCALE_FACTOR_2750:
     case ZAURA_OUTPUT_SCALE_FACTOR_3000:
     case ZAURA_OUTPUT_SCALE_FACTOR_3500:
     case ZAURA_OUTPUT_SCALE_FACTOR_4000:
     case ZAURA_OUTPUT_SCALE_FACTOR_4500:
     case ZAURA_OUTPUT_SCALE_FACTOR_5000:
       break;
     default:
       fprintf(stderr, "warning: unknown scale factor: %d\n", scale);
       break;
   }

   if (flags & ZAURA_OUTPUT_SCALE_PROPERTY_CURRENT)
     host->current_scale = scale;
   if (flags & ZAURA_OUTPUT_SCALE_PROPERTY_PREFERRED)
     host->preferred_scale = scale;

   host->expecting_scale = 0;
 }

 static void sl_aura_output_connection(void* data,
                                       struct zaura_output* output,
                                       uint32_t connection) {
   struct sl_host_output* host = zaura_output_get_user_data(output);

   host->internal = connection == ZAURA_OUTPUT_CONNECTION_TYPE_INTERNAL;
 }

 static void sl_aura_output_device_scale_factor(void* data,
                                                struct zaura_output* output,
                                                uint32_t device_scale_factor) {
   struct sl_host_output* host = zaura_output_get_user_data(output);

   host->device_scale_factor = device_scale_factor;
 }

 static const struct zaura_output_listener sl_aura_output_listener = {
     sl_aura_output_scale, sl_aura_output_connection,
     sl_aura_output_device_scale_factor};

 static void sl_destroy_host_output(struct wl_resource* resource) {
   struct sl_host_output* host = wl_resource_get_user_data(resource);

   if (host->aura_output)
     zaura_output_destroy(host->aura_output);
   if (wl_output_get_version(host->proxy) >= WL_OUTPUT_RELEASE_SINCE_VERSION) {
     wl_output_release(host->proxy);
   } else {
     wl_output_destroy(host->proxy);
   }
   wl_resource_set_user_data(resource, NULL);
   wl_list_remove(&host->link);
   free(host->make);
   free(host->model);
   free(host);
 }

 static void sl_bind_host_output(struct wl_client* client,
                                 void* data,
                                 uint32_t version,
                                 uint32_t id) {
   struct sl_output* output = (struct sl_output*)data;
   struct sl_context* ctx = output->ctx;
   struct sl_host_output* host;

   host = malloc(sizeof(*host));
   assert(host);
   host->ctx = ctx;
   host->resource = wl_resource_create(client, &wl_output_interface,
                                       MIN(version, output->version), id);
   wl_resource_set_implementation(host->resource, NULL, host,
                                  sl_destroy_host_output);
   host->proxy = wl_registry_bind(wl_display_get_registry(ctx->display),
                                  output->id, &wl_output_interface,
                                  wl_resource_get_version(host->resource));
   wl_output_set_user_data(host->proxy, host);
   wl_output_add_listener(host->proxy, &sl_output_listener, host);
   host->aura_output = NULL;
   // We assume that first output is internal by default.
   host->internal = wl_list_empty(&ctx->host_outputs);
   host->x = 0;
   host->y = 0;
   host->physical_width = 0;
   host->physical_height = 0;
   host->subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
   host->make = strdup("unknown");
   host->model = strdup("unknown");
   host->transform = WL_OUTPUT_TRANSFORM_NORMAL;
   host->flags = 0;
   host->width = 1024;
   host->height = 768;
   host->refresh = 60000;
   host->scale_factor = 1;
   host->current_scale = 1000;
   host->preferred_scale = 1000;
   host->device_scale_factor = 1000;
   host->expecting_scale = 0;
   wl_list_insert(ctx->host_outputs.prev, &host->link);
   if (ctx->aura_shell) {
     host->expecting_scale = 1;
     host->internal = 0;
     host->aura_output =
         zaura_shell_get_aura_output(ctx->aura_shell->internal, host->proxy);
     zaura_output_set_user_data(host->aura_output, host);
     zaura_output_add_listener(host->aura_output, &sl_aura_output_listener,
                               host);
   }
 }

 struct sl_global* sl_output_global_create(struct sl_output* output) {
   return sl_global_create(output->ctx, &wl_output_interface, output->version,
                           output, sl_bind_host_output);
 }
	// Copyright 2018 The Chromium OS Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "sommelier.h"

	#include <assert.h>
	#include <stdlib.h>
	#include <string.h>
	#include <wayland-client.h>

	#include "aura-shell-client-protocol.h"

	#define MAX_OUTPUT_SCALE 2

	#define INCH_IN_MM 25.4

	double sl_output_aura_scale_factor_to_double(int scale_factor) {
	// Aura scale factor is an enum that for all currently know values
	// is a scale value multipled by 1000. For example, enum value for
	// 1.25 scale factor is 1250.
	return scale_factor / 1000.0;
	}

	void sl_output_get_host_output_state(struct sl_host_output* host,
	int* scale,
	int* physical_width,
	int* physical_height,
	int* width,
	int* height) {
	double preferred_scale =
	sl_output_aura_scale_factor_to_double(host->preferred_scale);
	double current_scale =
	sl_output_aura_scale_factor_to_double(host->current_scale);
	double ideal_scale_factor = 1.0;
	double scale_factor = host->scale_factor;

	// Use the scale factor we received from aura shell protocol when available.
	if (host->ctx->aura_shell) {
	double device_scale_factor =
	sl_output_aura_scale_factor_to_double(host->device_scale_factor);

	ideal_scale_factor = device_scale_factor * preferred_scale;
	scale_factor = device_scale_factor * current_scale;
	}

	// Always use scale=1 and adjust geometry and mode based on ideal
	// scale factor for Xwayland client. For other clients, pick an optimal
	// scale and adjust geometry and mode based on it.
	if (host->ctx->xwayland) {
	if (scale)
	*scale = 1;
	physical_width = host->physical_width ideal_scale_factor / scale_factor;
	*physical_height =
	host->physical_height * ideal_scale_factor / scale_factor;
	width = host->width host->ctx->scale / scale_factor;
	height = host->height host->ctx->scale / scale_factor;
	} else {
	int s = MIN(ceil(scale_factor / host->ctx->scale), MAX_OUTPUT_SCALE);

	if (scale)
	*scale = s;
	*physical_width = host->physical_width;
	*physical_height = host->physical_height;
	width = host->width host->ctx->scale * s / scale_factor;
	height = host->height host->ctx->scale * s / scale_factor;
	}

	if (host->ctx->dpi.size) {
	int dpi = (width INCH_IN_MM) / *physical_width;
	int adjusted_dpi = ((int)host->ctx->dpi.data);
	double mmpd;
	int* p;

	wl_array_for_each(p, &host->ctx->dpi) {
	if (*p > dpi)
	break;

	adjusted_dpi = *p;
	}

	mmpd = INCH_IN_MM / adjusted_dpi;
	physical_width = width * mmpd + 0.5;
	physical_height = height * mmpd + 0.5;
	}
	}

	void sl_output_send_host_output_state(struct sl_host_output* host) {
	int scale;
	int physical_width;
	int physical_height;
	int width;
	int height;

	sl_output_get_host_output_state(host, &scale, &physical_width,
	&physical_height, &width, &height);

	// Use density of internal display for all Xwayland outputs. X11 clients
	// typically lack support for dynamically changing density so it's
	// preferred to always use the density of the internal display.
	if (host->ctx->xwayland) {
	struct sl_host_output* output;

	wl_list_for_each(output, &host->ctx->host_outputs, link) {
	if (output->internal) {
	int internal_width;
	int internal_height;

	sl_output_get_host_output_state(output, NULL, &physical_width,
	&physical_height, &internal_width,
	&internal_height);

	physical_width = (physical_width * width) / internal_width;
	physical_height = (physical_height * height) / internal_height;
	break;
	}
	}
	}

	// X/Y are best left at origin as managed X windows are kept centered on
	// the root window. The result is that all outputs are overlapping and
	// pointer events can always be dispatched to the visible region of the
	// window.
	wl_output_send_geometry(host->resource, 0, 0, physical_width, physical_height,
	host->subpixel, host->make, host->model,
	host->transform);
	wl_output_send_mode(host->resource, host->flags \| WL_OUTPUT_MODE_CURRENT,
	width, height, host->refresh);
	if (wl_resource_get_version(host->resource) >= WL_OUTPUT_SCALE_SINCE_VERSION)
	wl_output_send_scale(host->resource, scale);
	if (wl_resource_get_version(host->resource) >= WL_OUTPUT_DONE_SINCE_VERSION)
	wl_output_send_done(host->resource);
	}

	static void sl_output_geometry(void* data,
	struct wl_output* output,
	int x,
	int y,
	int physical_width,
	int physical_height,
	int subpixel,
	const char* make,
	const char* model,
	int transform) {
	struct sl_host_output* host = wl_output_get_user_data(output);

	host->x = x;
	host->y = y;
	host->physical_width = physical_width;
	host->physical_height = physical_height;
	host->subpixel = subpixel;
	free(host->model);
	host->model = strdup(model);
	free(host->make);
	host->make = strdup(make);
	host->transform = transform;
	}

	static void sl_output_mode(void* data,
	struct wl_output* output,
	uint32_t flags,
	int width,
	int height,
	int refresh) {
	struct sl_host_output* host = wl_output_get_user_data(output);

	host->flags = flags;
	host->width = width;
	host->height = height;
	host->refresh = refresh;
	}

	static void sl_output_done(void* data, struct wl_output* output) {
	struct sl_host_output* host = wl_output_get_user_data(output);

	// Early out if scale is expected but not yet know.
	if (host->expecting_scale)
	return;

	sl_output_send_host_output_state(host);

	// Expect scale if aura output exists.
	if (host->aura_output)
	host->expecting_scale = 1;
	}

	static void sl_output_scale(void* data,
	struct wl_output* output,
	int32_t scale_factor) {
	struct sl_host_output* host = wl_output_get_user_data(output);

	host->scale_factor = scale_factor;
	}

	static const struct wl_output_listener sl_output_listener = {
	sl_output_geometry, sl_output_mode, sl_output_done, sl_output_scale};

	static void sl_aura_output_scale(void* data,
	struct zaura_output* output,
	uint32_t flags,
	uint32_t scale) {
	struct sl_host_output* host = zaura_output_get_user_data(output);

	switch (scale) {
	case ZAURA_OUTPUT_SCALE_FACTOR_0400:
	case ZAURA_OUTPUT_SCALE_FACTOR_0500:
	case ZAURA_OUTPUT_SCALE_FACTOR_0550:
	case ZAURA_OUTPUT_SCALE_FACTOR_0600:
	case ZAURA_OUTPUT_SCALE_FACTOR_0625:
	case ZAURA_OUTPUT_SCALE_FACTOR_0650:
	case ZAURA_OUTPUT_SCALE_FACTOR_0700:
	case ZAURA_OUTPUT_SCALE_FACTOR_0750:
	case ZAURA_OUTPUT_SCALE_FACTOR_0800:
	case ZAURA_OUTPUT_SCALE_FACTOR_0850:
	case ZAURA_OUTPUT_SCALE_FACTOR_0900:
	case ZAURA_OUTPUT_SCALE_FACTOR_0950:
	case ZAURA_OUTPUT_SCALE_FACTOR_1000:
	case ZAURA_OUTPUT_SCALE_FACTOR_1050:
	case ZAURA_OUTPUT_SCALE_FACTOR_1100:
	case ZAURA_OUTPUT_SCALE_FACTOR_1150:
	case ZAURA_OUTPUT_SCALE_FACTOR_1125:
	case ZAURA_OUTPUT_SCALE_FACTOR_1200:
	case ZAURA_OUTPUT_SCALE_FACTOR_1250:
	case ZAURA_OUTPUT_SCALE_FACTOR_1300:
	case ZAURA_OUTPUT_SCALE_FACTOR_1400:
	case ZAURA_OUTPUT_SCALE_FACTOR_1450:
	case ZAURA_OUTPUT_SCALE_FACTOR_1500:
	case ZAURA_OUTPUT_SCALE_FACTOR_1600:
	case ZAURA_OUTPUT_SCALE_FACTOR_1750:
	case ZAURA_OUTPUT_SCALE_FACTOR_1800:
	case ZAURA_OUTPUT_SCALE_FACTOR_2000:
	case ZAURA_OUTPUT_SCALE_FACTOR_2200:
	case ZAURA_OUTPUT_SCALE_FACTOR_2250:
	case ZAURA_OUTPUT_SCALE_FACTOR_2500:
	case ZAURA_OUTPUT_SCALE_FACTOR_2750:
	case ZAURA_OUTPUT_SCALE_FACTOR_3000:
	case ZAURA_OUTPUT_SCALE_FACTOR_3500:
	case ZAURA_OUTPUT_SCALE_FACTOR_4000:
	case ZAURA_OUTPUT_SCALE_FACTOR_4500:
	case ZAURA_OUTPUT_SCALE_FACTOR_5000:
	break;
	default:
	fprintf(stderr, "warning: unknown scale factor: %d\n", scale);
	break;
	}

	if (flags & ZAURA_OUTPUT_SCALE_PROPERTY_CURRENT)
	host->current_scale = scale;
	if (flags & ZAURA_OUTPUT_SCALE_PROPERTY_PREFERRED)
	host->preferred_scale = scale;

	host->expecting_scale = 0;
	}

	static void sl_aura_output_connection(void* data,
	struct zaura_output* output,
	uint32_t connection) {
	struct sl_host_output* host = zaura_output_get_user_data(output);

	host->internal = connection == ZAURA_OUTPUT_CONNECTION_TYPE_INTERNAL;
	}

	static void sl_aura_output_device_scale_factor(void* data,
	struct zaura_output* output,
	uint32_t device_scale_factor) {
	struct sl_host_output* host = zaura_output_get_user_data(output);

	host->device_scale_factor = device_scale_factor;
	}

	static const struct zaura_output_listener sl_aura_output_listener = {
	sl_aura_output_scale, sl_aura_output_connection,
	sl_aura_output_device_scale_factor};

	static void sl_destroy_host_output(struct wl_resource* resource) {
	struct sl_host_output* host = wl_resource_get_user_data(resource);

	if (host->aura_output)
	zaura_output_destroy(host->aura_output);
	if (wl_output_get_version(host->proxy) >= WL_OUTPUT_RELEASE_SINCE_VERSION) {
	wl_output_release(host->proxy);
	} else {
	wl_output_destroy(host->proxy);
	}
	wl_resource_set_user_data(resource, NULL);
	wl_list_remove(&host->link);
	free(host->make);
	free(host->model);
	free(host);
	}

	static void sl_bind_host_output(struct wl_client* client,
	void* data,
	uint32_t version,
	uint32_t id) {
	struct sl_output* output = (struct sl_output*)data;
	struct sl_context* ctx = output->ctx;
	struct sl_host_output* host;

	host = malloc(sizeof(*host));
	assert(host);
	host->ctx = ctx;
	host->resource = wl_resource_create(client, &wl_output_interface,
	MIN(version, output->version), id);
	wl_resource_set_implementation(host->resource, NULL, host,
	sl_destroy_host_output);
	host->proxy = wl_registry_bind(wl_display_get_registry(ctx->display),
	output->id, &wl_output_interface,
	wl_resource_get_version(host->resource));
	wl_output_set_user_data(host->proxy, host);
	wl_output_add_listener(host->proxy, &sl_output_listener, host);
	host->aura_output = NULL;
	// We assume that first output is internal by default.
	host->internal = wl_list_empty(&ctx->host_outputs);
	host->x = 0;
	host->y = 0;
	host->physical_width = 0;
	host->physical_height = 0;
	host->subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
	host->make = strdup("unknown");
	host->model = strdup("unknown");
	host->transform = WL_OUTPUT_TRANSFORM_NORMAL;
	host->flags = 0;
	host->width = 1024;
	host->height = 768;
	host->refresh = 60000;
	host->scale_factor = 1;
	host->current_scale = 1000;
	host->preferred_scale = 1000;
	host->device_scale_factor = 1000;
	host->expecting_scale = 0;
	wl_list_insert(ctx->host_outputs.prev, &host->link);
	if (ctx->aura_shell) {
	host->expecting_scale = 1;
	host->internal = 0;
	host->aura_output =
	zaura_shell_get_aura_output(ctx->aura_shell->internal, host->proxy);
	zaura_output_set_user_data(host->aura_output, host);
	zaura_output_add_listener(host->aura_output, &sl_aura_output_listener,
	host);
	}
	}

	struct sl_global* sl_output_global_create(struct sl_output* output) {
	return sl_global_create(output->ctx, &wl_output_interface, output->version,
	output, sl_bind_host_output);
	}