weston/libweston/backend-rdp/rdp.c

/*
 * Copyright © 2013 Hardening <rdp.effort@gmail.com>
 *
 * 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 <assert.h>
#include <drm_fourcc.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <linux/input.h>
#include <unistd.h>

#include "rdp.h"

#include <winpr/input.h>
#include <winpr/ssl.h>

#include "shared/timespec-util.h"
#include "shared/xalloc.h"
#include <libweston/libweston.h>
#include <libweston/backend-rdp.h>
#include <libweston/pixel-formats.h>
#include "pixman-renderer.h"
#include "renderer-gl/gl-renderer.h"
#include "shared/weston-egl-ext.h"

/* These can be removed when we bump FreeRDP dependency past 3.0.0 in the future */
#ifndef KBD_PERSIAN
#define KBD_PERSIAN 0x50429
#endif
#ifndef KBD_HEBREW_STANDARD
#define KBD_HEBREW_STANDARD 0x2040D
#endif

extern PWtsApiFunctionTable FreeRDP_InitWtsApi(void);

static BOOL
xf_peer_adjust_monitor_layout(freerdp_peer *client);

static struct rdp_output *
rdp_get_first_output(struct rdp_backend *b)
{
	struct weston_output *output;
	struct rdp_output *rdp_output;

	wl_list_for_each(output, &b->compositor->output_list, link) {
		rdp_output = to_rdp_output(output);
		if (rdp_output)
			return rdp_output;
	}

	return NULL;
}

static void
rdp_peer_refresh_rfx(pixman_region32_t *damage, pixman_image_t *image, freerdp_peer *peer)
{
	int width, height, nrects, i;
	pixman_box32_t *region, *rects;
	uint32_t *ptr;
	RFX_RECT *rfxRect;
	rdpUpdate *update = peer->context->update;
	SURFACE_BITS_COMMAND cmd = { 0 };
	RdpPeerContext *context = (RdpPeerContext *)peer->context;

	Stream_Clear(context->encode_stream);
	Stream_SetPosition(context->encode_stream, 0);

	width = (damage->extents.x2 - damage->extents.x1);
	height = (damage->extents.y2 - damage->extents.y1);

	cmd.skipCompression = TRUE;
	cmd.cmdType = CMDTYPE_STREAM_SURFACE_BITS;
	cmd.destLeft = damage->extents.x1;
	cmd.destTop = damage->extents.y1;
	cmd.destRight = damage->extents.x2;
	cmd.destBottom = damage->extents.y2;
	cmd.bmp.bpp = 32;
	cmd.bmp.codecID = peer->context->settings->RemoteFxCodecId;
	cmd.bmp.width = width;
	cmd.bmp.height = height;

	ptr = pixman_image_get_data(image) + damage->extents.x1 +
				damage->extents.y1 * (pixman_image_get_stride(image) / sizeof(uint32_t));

	rects = pixman_region32_rectangles(damage, &nrects);
	context->rfx_rects = realloc(context->rfx_rects, nrects * sizeof *rfxRect);

	for (i = 0; i < nrects; i++) {
		region = &rects[i];
		rfxRect = &context->rfx_rects[i];

		rfxRect->x = (region->x1 - damage->extents.x1);
		rfxRect->y = (region->y1 - damage->extents.y1);
		rfxRect->width = (region->x2 - region->x1);
		rfxRect->height = (region->y2 - region->y1);
	}

	rfx_compose_message(context->rfx_context, context->encode_stream, context->rfx_rects, nrects,
			(BYTE *)ptr, width, height,
			pixman_image_get_stride(image)
	);

	cmd.bmp.bitmapDataLength = Stream_GetPosition(context->encode_stream);
	cmd.bmp.bitmapData = Stream_Buffer(context->encode_stream);

	update->SurfaceBits(update->context, &cmd);
}


static void
rdp_peer_refresh_nsc(pixman_region32_t *damage, pixman_image_t *image, freerdp_peer *peer)
{
	int width, height;
	uint32_t *ptr;
	rdpUpdate *update = peer->context->update;
	SURFACE_BITS_COMMAND cmd = { 0 };
	RdpPeerContext *context = (RdpPeerContext *)peer->context;

	Stream_Clear(context->encode_stream);
	Stream_SetPosition(context->encode_stream, 0);

	width = (damage->extents.x2 - damage->extents.x1);
	height = (damage->extents.y2 - damage->extents.y1);

	cmd.cmdType = CMDTYPE_SET_SURFACE_BITS;
	cmd.skipCompression = TRUE;
	cmd.destLeft = damage->extents.x1;
	cmd.destTop = damage->extents.y1;
	cmd.destRight = damage->extents.x2;
	cmd.destBottom = damage->extents.y2;
	cmd.bmp.bpp = 32;
	cmd.bmp.codecID = peer->context->settings->NSCodecId;
	cmd.bmp.width = width;
	cmd.bmp.height = height;

	ptr = pixman_image_get_data(image) + damage->extents.x1 +
				damage->extents.y1 * (pixman_image_get_stride(image) / sizeof(uint32_t));

	nsc_compose_message(context->nsc_context, context->encode_stream, (BYTE *)ptr,
			width, height,
			pixman_image_get_stride(image));

	cmd.bmp.bitmapDataLength = Stream_GetPosition(context->encode_stream);
	cmd.bmp.bitmapData = Stream_Buffer(context->encode_stream);

	update->SurfaceBits(update->context, &cmd);
}

static void
pixman_image_flipped_subrect(const pixman_box32_t *rect, pixman_image_t *img, BYTE *dest)
{
	int stride = pixman_image_get_stride(img);
	int h;
	int toCopy = (rect->x2 - rect->x1) * 4;
	int height = (rect->y2 - rect->y1);
	const BYTE *src = (const BYTE *)pixman_image_get_data(img);
	src += ((rect->y2-1) * stride) + (rect->x1 * 4);

	for (h = 0; h < height; h++, src -= stride, dest += toCopy)
		   memcpy(dest, src, toCopy);
}

static void
rdp_peer_refresh_raw(pixman_region32_t *region, pixman_image_t *image, freerdp_peer *peer)
{
	rdpUpdate *update = peer->context->update;
	SURFACE_BITS_COMMAND cmd = { 0 };
	SURFACE_FRAME_MARKER marker;
	pixman_box32_t *rect, subrect;
	int nrects, i;
	int heightIncrement, remainingHeight, top;

	rect = pixman_region32_rectangles(region, &nrects);
	if (!nrects)
		return;

	marker.frameId++;
	marker.frameAction = SURFACECMD_FRAMEACTION_BEGIN;
	update->SurfaceFrameMarker(peer->context, &marker);

	cmd.cmdType = CMDTYPE_SET_SURFACE_BITS;
	cmd.bmp.bpp = 32;
	cmd.bmp.codecID = 0;

	for (i = 0; i < nrects; i++, rect++) {
		/*weston_log("rect(%d,%d, %d,%d)\n", rect->x1, rect->y1, rect->x2, rect->y2);*/
		cmd.destLeft = rect->x1;
		cmd.destRight = rect->x2;
		cmd.bmp.width = (rect->x2 - rect->x1);

		heightIncrement = peer->context->settings->MultifragMaxRequestSize / (16 + cmd.bmp.width * 4);
		remainingHeight = rect->y2 - rect->y1;
		top = rect->y1;

		subrect.x1 = rect->x1;
		subrect.x2 = rect->x2;

		while (remainingHeight) {
			   cmd.bmp.height = (remainingHeight > heightIncrement) ? heightIncrement : remainingHeight;
			   cmd.destTop = top;
			   cmd.destBottom = top + cmd.bmp.height;
			   cmd.bmp.bitmapDataLength = cmd.bmp.width * cmd.bmp.height * 4;
			   cmd.bmp.bitmapData = (BYTE *)realloc(cmd.bmp.bitmapData, cmd.bmp.bitmapDataLength);

			   subrect.y1 = top;
			   subrect.y2 = top + cmd.bmp.height;
			   pixman_image_flipped_subrect(&subrect, image, cmd.bmp.bitmapData);

			   /*weston_log("*  sending (%d,%d, %d,%d)\n", subrect.x1, subrect.y1, subrect.x2, subrect.y2); */
			   update->SurfaceBits(peer->context, &cmd);

			   remainingHeight -= cmd.bmp.height;
			   top += cmd.bmp.height;
		}
	}

	free(cmd.bmp.bitmapData);

	marker.frameAction = SURFACECMD_FRAMEACTION_END;
	update->SurfaceFrameMarker(peer->context, &marker);
}

static void
rdp_peer_refresh_region(pixman_region32_t *region, freerdp_peer *peer)
{
	RdpPeerContext *context = (RdpPeerContext *)peer->context;
	struct rdp_output *output = rdp_get_first_output(context->rdpBackend);
	rdpSettings *settings = peer->context->settings;

	if (settings->RemoteFxCodec)
		rdp_peer_refresh_rfx(region, output->shadow_surface, peer);
	else if (settings->NSCodec)
		rdp_peer_refresh_nsc(region, output->shadow_surface, peer);
	else
		rdp_peer_refresh_raw(region, output->shadow_surface, peer);
}

static int
rdp_output_start_repaint_loop(struct weston_output *output)
{
	struct timespec ts;

	weston_compositor_read_presentation_clock(output->compositor, &ts);
	weston_output_finish_frame(output, &ts, WP_PRESENTATION_FEEDBACK_INVALID);

	return 0;
}

static int
rdp_output_repaint(struct weston_output *output_base, pixman_region32_t *damage)
{
	struct rdp_output *output = container_of(output_base, struct rdp_output, base);
	struct weston_compositor *ec = output->base.compositor;
	struct rdp_backend *b = output->backend;
	struct rdp_peers_item *peer;

	assert(output);

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

	if (pixman_region32_not_empty(damage)) {
		pixman_region32_t transformed_damage;
		pixman_region32_init(&transformed_damage);
		weston_region_global_to_output(&transformed_damage,
					       output_base,
					       damage);
		wl_list_for_each(peer, &b->peers, link) {
			if ((peer->flags & RDP_PEER_ACTIVATED) &&
			    (peer->flags & RDP_PEER_OUTPUT_ENABLED)) {
				rdp_peer_refresh_region(&transformed_damage, peer->peer);
			}
		}
		pixman_region32_fini(&transformed_damage);
	}

	weston_output_arm_frame_timer(output_base, output->finish_frame_timer);

	return 0;
}

static int
finish_frame_handler(void *data)
{
	struct rdp_output *output = data;

	weston_output_finish_frame_from_timer(&output->base);

	return 1;
}

static void
rdp_output_set_mode(struct weston_output *base, struct weston_mode *mode)
{
	struct rdp_output *rdpOutput = container_of(base, struct rdp_output, base);
	struct rdp_backend *b = rdpOutput->backend;
	struct weston_output *output = base;
	struct rdp_peers_item *rdpPeer;
	rdpSettings *settings;
	struct weston_renderbuffer *new_renderbuffer;

	mode->refresh = b->rdp_monitor_refresh_rate;
	weston_output_set_single_mode(base, mode);

	if (base->enabled) {
		const struct weston_renderer *renderer;
		pixman_image_t *new_image;

		weston_renderer_resize_output(output, &(struct weston_size){
			.width = output->current_mode->width,
			.height = output->current_mode->height }, NULL);

		new_image = pixman_image_create_bits(b->formats[0]->pixman_format,
						     mode->width, mode->height,
						     NULL, mode->width * 4);
		renderer = b->compositor->renderer;
		switch (renderer->type) {
		case WESTON_RENDERER_PIXMAN: {
			const struct pixman_renderer_interface *pixman;

			pixman = renderer->pixman;
			new_renderbuffer =
				pixman->create_image_from_ptr(output, b->formats[0],
							      mode->width, mode->height,
							      pixman_image_get_data(new_image),
							      mode->width * 4);
			break;
		}
		case WESTON_RENDERER_GL:
			new_renderbuffer =
				renderer->gl->create_fbo(output, b->formats[0],
							 mode->width, mode->height,
							 pixman_image_get_data(new_image));
			break;
		default:
			unreachable("cannot have auto renderer at runtime");
		}
		pixman_image_composite32(PIXMAN_OP_SRC, rdpOutput->shadow_surface,
					 0, new_image, 0, 0, 0, 0, 0, 0,
					 mode->width, mode->height);
		weston_renderbuffer_unref(rdpOutput->renderbuffer);
		rdpOutput->renderbuffer = new_renderbuffer;
		pixman_image_unref(rdpOutput->shadow_surface);
		rdpOutput->shadow_surface = new_image;
	}

	/* Apparently settings->DesktopWidth is supposed to be primary only.
	 * For now we only work with a single monitor, so we don't need to
	 * check that we're primary here.
	 */
	wl_list_for_each(rdpPeer, &b->peers, link) {
		settings = rdpPeer->peer->context->settings;
		if (settings->DesktopWidth == (uint32_t)mode->width &&
		    settings->DesktopHeight == (uint32_t)mode->height)
			continue;

		if (!settings->DesktopResize) {
			/* too bad this peer does not support desktop resize */
			weston_log("desktop resize is not allowed\n");
			rdpPeer->peer->Close(rdpPeer->peer);
		} else {
			settings->DesktopWidth = mode->width;
			settings->DesktopHeight = mode->height;
			rdpPeer->peer->context->update->DesktopResize(rdpPeer->peer->context);
		}
	}
}

static int
rdp_output_switch_mode(struct weston_output *base, struct weston_mode *mode)
{
	rdp_output_set_mode(base, mode);

	return 0;
}

static void
rdp_head_get_monitor(struct weston_head *base,
		     struct weston_rdp_monitor *monitor)
{
	struct rdp_head *h = to_rdp_head(base);

	monitor->x = h->config.x;
	monitor->y = h->config.y;
	monitor->width = h->config.width;
	monitor->height = h->config.height;
	monitor->desktop_scale = h->config.attributes.desktopScaleFactor;
}

static int
rdp_output_enable(struct weston_output *base)
{
	const struct weston_renderer *renderer = base->compositor->renderer;
	const struct pixman_renderer_interface *pixman = renderer->pixman;
	struct rdp_output *output = to_rdp_output(base);
	struct rdp_backend *b;
	struct wl_event_loop *loop;

	assert(output);

	b = output->backend;

	output->shadow_surface = pixman_image_create_bits(b->formats[0]->pixman_format,
							  output->base.current_mode->width,
							  output->base.current_mode->height,
							  NULL,
							  output->base.current_mode->width * 4);

	switch (renderer->type) {
	case WESTON_RENDERER_PIXMAN: {
		const struct pixman_renderer_output_options options = {
			.fb_size = {
				.width = output->base.current_mode->width,
				.height = output->base.current_mode->height
			},
			.format = b->formats[0],
		};

		if (renderer->pixman->output_create(&output->base, &options) < 0) {
			return -1;
		}

		output->renderbuffer =
			pixman->create_image_from_ptr(&output->base, options.format,
						      output->base.current_mode->width,
						      output->base.current_mode->height,
						      pixman_image_get_data(output->shadow_surface),
						      output->base.current_mode->width * 4);
		if (output->renderbuffer == NULL) {
			weston_log("Failed to create surface for frame buffer.\n");
			renderer->pixman->output_destroy(&output->base);
			pixman_image_unref(output->shadow_surface);
			output->shadow_surface = NULL;
			return -1;
		}
		break;
	}
	case WESTON_RENDERER_GL: {
		const struct gl_renderer_fbo_options options = {
			.area = {
				.width = output->base.current_mode->width,
				.height = output->base.current_mode->height,
			},
			.fb_size = {
				.width = output->base.current_mode->width,
				.height = output->base.current_mode->height,
			},
		};

		if (renderer->gl->output_fbo_create(&output->base, &options) < 0)
			return -1;

		output->renderbuffer =
			renderer->gl->create_fbo(&output->base, b->formats[0],
						 output->base.current_mode->width,
						 output->base.current_mode->height,
						 pixman_image_get_data(output->shadow_surface));
		if (output->renderbuffer == NULL) {
			weston_log("Failed to create surface for frame buffer.\n");
			renderer->pixman->output_destroy(&output->base);
			pixman_image_unref(output->shadow_surface);
			output->shadow_surface = NULL;
			return -1;
		}
		break;
	}
	default:
		unreachable("cannot have auto renderer at runtime");
	}

	loop = wl_display_get_event_loop(b->compositor->wl_display);
	output->finish_frame_timer = wl_event_loop_add_timer(loop, finish_frame_handler, output);

	return 0;
}

static int
rdp_output_disable(struct weston_output *base)
{
	struct weston_renderer *renderer = base->compositor->renderer;
	struct rdp_output *output = to_rdp_output(base);

	assert(output);

	if (!output->base.enabled)
		return 0;

	weston_renderbuffer_unref(output->renderbuffer);
	output->renderbuffer = NULL;
	switch (renderer->type) {
	case WESTON_RENDERER_PIXMAN:
		renderer->pixman->output_destroy(&output->base);
		break;
	case WESTON_RENDERER_GL:
		renderer->gl->output_destroy(&output->base);
		break;
	default:
		unreachable("cannot have auto renderer at runtime");
	}
	pixman_image_unref(output->shadow_surface);
	output->shadow_surface = NULL;

	wl_event_source_remove(output->finish_frame_timer);

	return 0;
}

void
rdp_output_destroy(struct weston_output *base)
{
	struct rdp_output *output = to_rdp_output(base);

	assert(output);

	rdp_output_disable(&output->base);
	weston_output_release(&output->base);

	free(output);
}

static struct weston_output *
rdp_output_create(struct weston_backend *backend, const char *name)
{
	struct rdp_backend *b = container_of(backend, struct rdp_backend, base);
	struct weston_compositor *compositor = b->compositor;
	struct rdp_output *output;

	output = xzalloc(sizeof *output);

	weston_output_init(&output->base, compositor, name);

	output->base.destroy = rdp_output_destroy;
	output->base.disable = rdp_output_disable;
	output->base.enable = rdp_output_enable;

	output->base.start_repaint_loop = rdp_output_start_repaint_loop;
	output->base.repaint = rdp_output_repaint;
	output->base.switch_mode = rdp_output_switch_mode;

	output->backend = b;

	weston_compositor_add_pending_output(&output->base, compositor);

	return &output->base;
}

void
rdp_head_create(struct rdp_backend *backend, rdpMonitor *config)
{
	struct rdp_head *head;
	char name[13] = {}; /* "rdp-" + 8 chars for hex uint32_t + NULL. */

	head = xzalloc(sizeof *head);
	head->index = backend->head_index++;
	if (config)
		head->config = *config;
	else {
		/* Before any client conenctions we create a default head
		 * with no configuration. Make it the primary, and make
		 * it avoid the high dpi scaling paths.
		 */
		head->config.is_primary = true;
		head->config.attributes.desktopScaleFactor = 0;
	}

	sprintf(name, "rdp-%x", head->index);

	weston_head_init(&head->base, name);
	weston_head_set_monitor_strings(&head->base, "weston", "rdp", NULL);

	if (config)
		weston_head_set_physical_size(&head->base,
					      config->attributes.physicalWidth,
					      config->attributes.physicalHeight);
	else
		weston_head_set_physical_size(&head->base, 0, 0);

	head->base.backend = &backend->base;

	weston_head_set_connection_status(&head->base, true);
	weston_compositor_add_head(backend->compositor, &head->base);
}

void
rdp_head_destroy(struct weston_head *base)
{
	struct rdp_head *head = to_rdp_head(base);

	assert(head);

	weston_head_release(&head->base);
	free(head);
}

static void
rdp_shutdown(struct weston_backend *backend)
{
	struct rdp_backend *b = container_of(backend, struct rdp_backend, base);
	struct rdp_peers_item *rdp_peer, *tmp;
	int i;

	wl_list_for_each_safe(rdp_peer, tmp, &b->peers, link) {
		freerdp_peer* client = rdp_peer->peer;

		client->Disconnect(client);
		freerdp_peer_context_free(client);
		freerdp_peer_free(client);
	}

	for (i = 0; i < MAX_FREERDP_FDS; i++)
		if (b->listener_events[i])
			wl_event_source_remove(b->listener_events[i]);

}

void
rdp_destroy(struct weston_backend *backend)
{
	struct rdp_backend *b = container_of(backend, struct rdp_backend, base);
	struct weston_compositor *ec = b->compositor;
	struct weston_head *base, *next;

	if (b->clipboard_debug) {
		weston_log_scope_destroy(b->clipboard_debug);
		b->clipboard_debug = NULL;
	}

	if (b->clipboard_verbose) {
		weston_log_scope_destroy(b->clipboard_verbose);
		b->clipboard_verbose = NULL;
	}

	if (b->debug) {
		weston_log_scope_destroy(b->debug);
		b->debug = NULL;
	}

	if (b->verbose) {
		weston_log_scope_destroy(b->verbose);
		b->verbose = NULL;
	}

	wl_list_remove(&b->base.link);

	wl_list_for_each_safe(base, next, &ec->head_list, compositor_link) {
		if (to_rdp_head(base))
			rdp_head_destroy(base);
	}

	freerdp_listener_free(b->listener);

	free(b->server_cert);
	free(b->server_key);
	free(b->rdp_key);
	free(b);
}

static
int rdp_listener_activity(int fd, uint32_t mask, void *data)
{
	freerdp_listener* instance = (freerdp_listener *)data;

	if (!(mask & WL_EVENT_READABLE))
		return 0;
	if (!instance->CheckFileDescriptor(instance)) {
		weston_log("failed to check FreeRDP file descriptor\n");
		return -1;
	}
	return 0;
}

static
int rdp_implant_listener(struct rdp_backend *b, freerdp_listener* instance)
{
	int i, fd;
	int handle_count = 0;
	HANDLE handles[MAX_FREERDP_FDS];
	struct wl_event_loop *loop;

	handle_count = instance->GetEventHandles(instance, handles, MAX_FREERDP_FDS);
	if (!handle_count) {
		weston_log("Failed to get FreeRDP handles\n");
		return -1;
	}

	loop = wl_display_get_event_loop(b->compositor->wl_display);
	for (i = 0; i < handle_count; i++) {
		fd = GetEventFileDescriptor(handles[i]);
		b->listener_events[i] = wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
				rdp_listener_activity, instance);
	}

	for ( ; i < MAX_FREERDP_FDS; i++)
		b->listener_events[i] = 0;
	return 0;
}


static BOOL
rdp_peer_context_new(freerdp_peer* client, RdpPeerContext* context)
{
	context->item.peer = client;
	context->item.flags = RDP_PEER_OUTPUT_ENABLED;

	context->loop_task_event_source_fd = -1;
	context->loop_task_event_source = NULL;
	wl_list_init(&context->loop_task_list);

	context->rfx_context = rfx_context_new(TRUE);
	if (!context->rfx_context)
		return FALSE;

	context->rfx_context->mode = RLGR3;
	context->rfx_context->width = client->context->settings->DesktopWidth;
	context->rfx_context->height = client->context->settings->DesktopHeight;
	rfx_context_set_pixel_format(context->rfx_context, DEFAULT_PIXEL_FORMAT);

	context->nsc_context = nsc_context_new();
	if (!context->nsc_context)
		goto out_error_nsc;

	nsc_context_set_parameters(context->nsc_context, NSC_COLOR_FORMAT, DEFAULT_PIXEL_FORMAT);
	context->encode_stream = Stream_New(NULL, 65536);
	if (!context->encode_stream)
		goto out_error_stream;

	return TRUE;

out_error_nsc:
	rfx_context_free(context->rfx_context);
out_error_stream:
	nsc_context_free(context->nsc_context);
	return FALSE;
}

static void
rdp_peer_context_free(freerdp_peer* client, RdpPeerContext* context)
{
	struct rdp_backend *b;
	unsigned i;

	if (!context)
		return;

	b = context->rdpBackend;

	wl_list_remove(&context->item.link);

	for (i = 0; i < ARRAY_LENGTH(context->events); i++) {
		if (context->events[i])
			wl_event_source_remove(context->events[i]);
	}

	if (context->audio_in_private)
		b->audio_in_teardown(context->audio_in_private);

	if (context->audio_out_private)
		b->audio_out_teardown(context->audio_out_private);

	rdp_clipboard_destroy(context);

	if (context->vcm)
		WTSCloseServer(context->vcm);

	rdp_destroy_dispatch_task_event_source(context);

	if (context->item.flags & RDP_PEER_ACTIVATED) {
		weston_seat_release_keyboard(context->item.seat);
		weston_seat_release_pointer(context->item.seat);
		weston_seat_release(context->item.seat);
		free(context->item.seat);
	}

	Stream_Free(context->encode_stream, TRUE);
	nsc_context_free(context->nsc_context);
	rfx_context_free(context->rfx_context);
	free(context->rfx_rects);
}


static int
rdp_client_activity(int fd, uint32_t mask, void *data)
{
	freerdp_peer* client = (freerdp_peer *)data;
	RdpPeerContext *peerCtx = (RdpPeerContext *)client->context;

	if (!client->CheckFileDescriptor(client)) {
		weston_log("unable to checkDescriptor for %p\n", client);
		goto out_clean;
	}

	if (peerCtx && peerCtx->vcm)
	{
		if (!WTSVirtualChannelManagerCheckFileDescriptor(peerCtx->vcm)) {
			weston_log("failed to check FreeRDP WTS VC file descriptor for %p\n", client);
			goto out_clean;
		}
	}

	return 0;

out_clean:
	freerdp_peer_context_free(client);
	freerdp_peer_free(client);
	return 0;
}

static BOOL
xf_peer_capabilities(freerdp_peer* client)
{
	return TRUE;
}

struct rdp_to_xkb_keyboard_layout {
	UINT32 rdpLayoutCode;
	const char *xkbLayout;
	const char *xkbVariant;
};

/* table reversed from
	https://github.com/awakecoding/FreeRDP/blob/master/libfreerdp/locale/xkb_layout_ids.c#L811 */
static const
struct rdp_to_xkb_keyboard_layout rdp_keyboards[] = {
	{KBD_ARABIC_101, "ara", 0},
	{KBD_BULGARIAN, 0, 0},
	{KBD_CHINESE_TRADITIONAL_US, 0},
	{KBD_CZECH, "cz", 0},
	{KBD_CZECH_PROGRAMMERS, "cz", "bksl"},
	{KBD_CZECH_QWERTY, "cz", "qwerty"},
	{KBD_DANISH, "dk", 0},
	{KBD_GERMAN, "de", 0},
	{KBD_GERMAN_NEO, "de", "neo"},
	{KBD_GERMAN_IBM, "de", "qwerty"},
	{KBD_GREEK, "gr", 0},
	{KBD_GREEK_220, "gr", "simple"},
	{KBD_GREEK_319, "gr", "extended"},
	{KBD_GREEK_POLYTONIC, "gr", "polytonic"},
	{KBD_US, "us", 0},
	{KBD_UNITED_STATES_INTERNATIONAL, "us", "intl"},
	{KBD_US_ENGLISH_TABLE_FOR_IBM_ARABIC_238_L, "ara", "buckwalter"},
	{KBD_SPANISH, "es", 0},
	{KBD_SPANISH_VARIATION, "es", "nodeadkeys"},
	{KBD_FINNISH, "fi", 0},
	{KBD_FRENCH, "fr", 0},
	{KBD_HEBREW, "il", 0},
	{KBD_HEBREW_STANDARD, "il", "basic"},
	{KBD_HUNGARIAN, "hu", 0},
	{KBD_HUNGARIAN_101_KEY, "hu", "standard"},
	{KBD_ICELANDIC, "is", 0},
	{KBD_ITALIAN, "it", 0},
	{KBD_ITALIAN_142, "it", "nodeadkeys"},
	{KBD_JAPANESE, "jp", 0},
	{KBD_JAPANESE_INPUT_SYSTEM_MS_IME2002, "jp", 0},
	{KBD_KOREAN, "kr", 0},
	{KBD_KOREAN_INPUT_SYSTEM_IME_2000, "kr", "kr104"},
	{KBD_DUTCH, "nl", 0},
	{KBD_NORWEGIAN, "no", 0},
	{KBD_POLISH_PROGRAMMERS, "pl", 0},
	{KBD_POLISH_214, "pl", "qwertz"},
	{KBD_ROMANIAN, "ro", 0},
	{KBD_RUSSIAN, "ru", 0},
	{KBD_RUSSIAN_TYPEWRITER, "ru", "typewriter"},
	{KBD_CROATIAN, "hr", 0},
	{KBD_SLOVAK, "sk", 0},
	{KBD_SLOVAK_QWERTY, "sk", "qwerty"},
	{KBD_ALBANIAN, 0, 0},
	{KBD_SWEDISH, "se", 0},
	{KBD_THAI_KEDMANEE, "th", 0},
	{KBD_THAI_KEDMANEE_NON_SHIFTLOCK, "th", "tis"},
	{KBD_TURKISH_Q, "tr", 0},
	{KBD_TURKISH_F, "tr", "f"},
	{KBD_URDU, "in", "urd-phonetic3"},
	{KBD_UKRAINIAN, "ua", 0},
	{KBD_BELARUSIAN, "by", 0},
	{KBD_SLOVENIAN, "si", 0},
	{KBD_ESTONIAN, "ee", 0},
	{KBD_LATVIAN, "lv", 0},
	{KBD_LITHUANIAN_IBM, "lt", "ibm"},
	{KBD_FARSI, "ir", "pes"},
	{KBD_PERSIAN, "af", "basic"},
	{KBD_VIETNAMESE, "vn", 0},
	{KBD_ARMENIAN_EASTERN, "am", 0},
	{KBD_AZERI_LATIN, 0, 0},
	{KBD_FYRO_MACEDONIAN, "mk", 0},
	{KBD_GEORGIAN, "ge", 0},
	{KBD_FAEROESE, 0, 0},
	{KBD_DEVANAGARI_INSCRIPT, 0, 0},
	{KBD_MALTESE_47_KEY, 0, 0},
	{KBD_NORWEGIAN_WITH_SAMI, "no", "smi"},
	{KBD_KAZAKH, "kz", 0},
	{KBD_KYRGYZ_CYRILLIC, "kg", "phonetic"},
	{KBD_TATAR, "ru", "tt"},
	{KBD_BENGALI, "bd", 0},
	{KBD_BENGALI_INSCRIPT, "bd", "probhat"},
	{KBD_PUNJABI, 0, 0},
	{KBD_GUJARATI, "in", "guj"},
	{KBD_TAMIL, "in", "tam"},
	{KBD_TELUGU, "in", "tel"},
	{KBD_KANNADA, "in", "kan"},
	{KBD_MALAYALAM, "in", "mal"},
	{KBD_HINDI_TRADITIONAL, "in", 0},
	{KBD_MARATHI, 0, 0},
	{KBD_MONGOLIAN_CYRILLIC, "mn", 0},
	{KBD_UNITED_KINGDOM_EXTENDED, "gb", "intl"},
	{KBD_SYRIAC, "syc", 0},
	{KBD_SYRIAC_PHONETIC, "syc", "syc_phonetic"},
	{KBD_NEPALI, "np", 0},
	{KBD_PASHTO, "af", "ps"},
	{KBD_DIVEHI_PHONETIC, 0, 0},
	{KBD_LUXEMBOURGISH, 0, 0},
	{KBD_MAORI, "mao", 0},
	{KBD_CHINESE_SIMPLIFIED_US, 0, 0},
	{KBD_SWISS_GERMAN, "ch", "de_nodeadkeys"},
	{KBD_UNITED_KINGDOM, "gb", 0},
	{KBD_LATIN_AMERICAN, "latam", 0},
	{KBD_BELGIAN_FRENCH, "be", 0},
	{KBD_BELGIAN_PERIOD, "be", "oss_sundeadkeys"},
	{KBD_PORTUGUESE, "pt", 0},
	{KBD_SERBIAN_LATIN, "rs", 0},
	{KBD_AZERI_CYRILLIC, "az", "cyrillic"},
	{KBD_SWEDISH_WITH_SAMI, "se", "smi"},
	{KBD_UZBEK_CYRILLIC, "af", "uz"},
	{KBD_INUKTITUT_LATIN, "ca", "ike"},
	{KBD_CANADIAN_FRENCH_LEGACY, "ca", "fr-legacy"},
	{KBD_SERBIAN_CYRILLIC, "rs", 0},
	{KBD_CANADIAN_FRENCH, "ca", "fr-legacy"},
	{KBD_SWISS_FRENCH, "ch", "fr"},
	{KBD_BOSNIAN, "ba", 0},
	{KBD_IRISH, 0, 0},
	{KBD_BOSNIAN_CYRILLIC, "ba", "us"},
	{KBD_UNITED_STATES_DVORAK, "us", "dvorak"},
	{KBD_PORTUGUESE_BRAZILIAN_ABNT2, "br", "abnt2"},
	{KBD_CANADIAN_MULTILINGUAL_STANDARD, "ca", "multix"},
	{KBD_GAELIC, "ie", "CloGaelach"},

	{0x00000000, 0, 0},
};

void
convert_rdp_keyboard_to_xkb_rule_names(UINT32 KeyboardType,
				       UINT32 KeyboardSubType,
				       UINT32 KeyboardLayout,
				       struct xkb_rule_names *xkbRuleNames)
{
	int i;

	memset(xkbRuleNames, 0, sizeof(*xkbRuleNames));
	xkbRuleNames->model = "pc105";
	for (i = 0; rdp_keyboards[i].rdpLayoutCode; i++) {
		if (rdp_keyboards[i].rdpLayoutCode == KeyboardLayout) {
			xkbRuleNames->layout = rdp_keyboards[i].xkbLayout;
			xkbRuleNames->variant = rdp_keyboards[i].xkbVariant;
			break;
		}
	}

	/* Korean keyboard support (KeyboardType 8, LangID 0x412) */
	if (KeyboardType == KBD_TYPE_KOREAN && ((KeyboardLayout & 0xFFFF) == 0x412)) {
		/* TODO: PC/AT 101 Enhanced Korean Keyboard (Type B) and (Type C) are not supported yet
			 because default Xkb settings for Korean layout don't have corresponding
			 configuration.
			 (Type B): KeyboardSubType:4: rctrl_hangul/ratl_hanja
			 (Type C): KeyboardSubType:5: shift_space_hangul/crtl_space_hanja
		 */
		if (KeyboardSubType == 0 ||
		    KeyboardSubType == 3) /* PC/AT 101 Enhanced Korean Keyboard (Type A) */
			xkbRuleNames->variant = "kr104"; /* kr(ralt_hangul)/kr(rctrl_hanja) */
		else if (KeyboardSubType == 6) /* PC/AT 103 Enhanced Korean Keyboard */
			xkbRuleNames->variant = "kr106"; /* kr(hw_keys) */
	} else if (KeyboardType != KBD_TYPE_JAPANESE && ((KeyboardLayout & 0xFFFF) == 0x411)) {
		/* when Japanese keyboard layout is used without a Japanese 106/109
		 * keyboard (keyboard type 7), use the "us" layout, since the "jp"
		 * layout in xkb expects the Japanese 106/109 keyboard layout.
		 */
		xkbRuleNames->layout = "us";
		xkbRuleNames->variant = 0;
	}

	weston_log("%s: matching model=%s layout=%s variant=%s\n",
		   __func__, xkbRuleNames->model, xkbRuleNames->layout,
		   xkbRuleNames->variant);
}

static void
rdp_full_refresh(freerdp_peer *peer, struct rdp_output *output)
{
	pixman_box32_t box;
	pixman_region32_t damage;

	box.x1 = 0;
	box.y1 = 0;
	box.x2 = output->base.current_mode->width;
	box.y2 = output->base.current_mode->height;
	pixman_region32_init_with_extents(&damage, &box);

	rdp_peer_refresh_region(&damage, peer);

	pixman_region32_fini(&damage);
}

static BOOL
xf_peer_activate(freerdp_peer* client)
{
	RdpPeerContext *peerCtx;
	struct rdp_backend *b;
	struct rdp_output *output;
	rdpSettings *settings;
	rdpPointerUpdate *pointer;
	struct rdp_peers_item *peersItem;
	struct xkb_rule_names xkbRuleNames;
	struct xkb_keymap *keymap;
	struct weston_output *weston_output;
	char seat_name[50];
	POINTER_SYSTEM_UPDATE pointer_system;
	int width, height;

	peerCtx = (RdpPeerContext *)client->context;
	b = peerCtx->rdpBackend;
	peersItem = &peerCtx->item;
	output = rdp_get_first_output(b);
	settings = client->context->settings;

	if (!settings->SurfaceCommandsEnabled) {
		weston_log("client doesn't support required SurfaceCommands\n");
		return FALSE;
	}

	if (b->force_no_compression && settings->CompressionEnabled) {
		rdp_debug(b, "Forcing compression off\n");
		settings->CompressionEnabled = FALSE;
	}

	settings->AudioPlayback = b->audio_out_setup && b->audio_out_teardown;
	settings->AudioCapture = b->audio_in_setup && b->audio_in_teardown;

	if (settings->RedirectClipboard ||
	    settings->AudioPlayback ||
	    settings->AudioCapture) {
		if (!peerCtx->vcm) {
			weston_log("Virtual channel is required for clipboard, audio playback/capture\n");
			goto error_exit;
		}
		/* Audio setup will return NULL on failure, and we'll proceed without audio */
		if (settings->AudioPlayback)
			peerCtx->audio_out_private = b->audio_out_setup(b->compositor, peerCtx->vcm);

		if (settings->AudioCapture)
			peerCtx->audio_in_private = b->audio_in_setup(b->compositor, peerCtx->vcm);
	}

	/* If we don't allow resize, we need to tell the client to resize itself.
	 * We still need the xf_peer_adjust_monitor_layout() call to make sure
	 * we've set up scaling appropriately.
	 */
	if (b->no_clients_resize) {
		struct weston_mode *mode = output->base.current_mode;

		if (mode->width != (int)settings->DesktopWidth ||
		    mode->height != (int)settings->DesktopHeight) {
			if (!settings->DesktopResize) {
				/* peer does not support desktop resize */
				weston_log("client doesn't support resizing, closing connection\n");
				return FALSE;
			} else {
				settings->DesktopWidth = mode->width;
				settings->DesktopHeight = mode->height;
				client->context->update->DesktopResize(client->context);
			}
		}
	} else {
		xf_peer_adjust_monitor_layout(client);
	}

	weston_output = &output->base;
	width = weston_output->width * weston_output->scale;
	height = weston_output->height * weston_output->scale;
	rfx_context_reset(peerCtx->rfx_context, width, height);
	nsc_context_reset(peerCtx->nsc_context, width, height);

	if (peersItem->flags & RDP_PEER_ACTIVATED)
		return TRUE;

	/* when here it's the first reactivation, we need to setup a little more */
	rdp_debug(b, "kbd_layout:0x%x kbd_type:0x%x kbd_subType:0x%x kbd_functionKeys:0x%x\n",
			settings->KeyboardLayout, settings->KeyboardType, settings->KeyboardSubType,
			settings->KeyboardFunctionKey);

	convert_rdp_keyboard_to_xkb_rule_names(settings->KeyboardType,
					       settings->KeyboardSubType,
					       settings->KeyboardLayout,
					       &xkbRuleNames);

	keymap = NULL;
	if (xkbRuleNames.layout) {
		keymap = xkb_keymap_new_from_names(b->compositor->xkb_context,
						   &xkbRuleNames, 0);
	}

	if (settings->ClientHostname)
		snprintf(seat_name, sizeof(seat_name), "RDP %s", settings->ClientHostname);
	else
		snprintf(seat_name, sizeof(seat_name), "RDP peer @%s", settings->ClientAddress);

	peersItem->seat = zalloc(sizeof(*peersItem->seat));
	if (!peersItem->seat) {
		xkb_keymap_unref(keymap);
		weston_log("unable to create a weston_seat\n");
		return FALSE;
	}

	weston_seat_init(peersItem->seat, b->compositor, seat_name);
	weston_seat_init_keyboard(peersItem->seat, keymap);
	xkb_keymap_unref(keymap);
	weston_seat_init_pointer(peersItem->seat);

	/* Initialize RDP clipboard after seat is initialized */
	if (settings->RedirectClipboard)
		if (rdp_clipboard_init(client) != 0)
			goto error_exit;

	peersItem->flags |= RDP_PEER_ACTIVATED;

	/* disable pointer on the client side */
	pointer = client->context->update->pointer;
	pointer_system.type = SYSPTR_NULL;
	pointer->PointerSystem(client->context, &pointer_system);

	rdp_full_refresh(client, output);

	return TRUE;

error_exit:

	rdp_clipboard_destroy(peerCtx);

	if (settings->AudioPlayback && peerCtx->audio_out_private)
		b->audio_out_teardown(peerCtx->audio_out_private);

	if (settings->AudioCapture && peerCtx->audio_in_private)
		b->audio_in_teardown(peerCtx->audio_in_private);

	return FALSE;
}

static BOOL
xf_peer_post_connect(freerdp_peer *client)
{
	return TRUE;
}

static bool
rdp_translate_and_notify_mouse_position(RdpPeerContext *peerContext, UINT16 x, UINT16 y)
{
	struct weston_coord_global pos;
	struct timespec time;
	int sx, sy;

	if (!peerContext->item.seat)
		return FALSE;

	/* (TS_POINTERX_EVENT):The xy-coordinate of the pointer relative to the top-left
	 *                     corner of the server's desktop combined all monitors */

	/* first, convert the coordinate based on primary monitor's upper-left as (0,0) */
	sx = x + peerContext->desktop_left;
	sy = y + peerContext->desktop_top;

	/* translate client's x/y to the coordinate in weston space. */
	/* TODO: to_weston_coordinate() is translate based on where pointer is,
	         not based-on where/which window underneath. Thus, this doesn't
	         work when window lays across more than 2 monitors and each monitor has
	         different scaling. In such case, hit test to that window area on
	         non primary-resident monitor (surface->output) dosn't work. */
	if (to_weston_coordinate(peerContext, &sx, &sy)) {
		pos.c = weston_coord(sx, sy);
		weston_compositor_get_time(&time);
		notify_motion_absolute(peerContext->item.seat, &time, pos);
		return TRUE;
	}
	return FALSE;
}

static void
dump_mouseinput(RdpPeerContext *peerContext, UINT16 flags, UINT16 x, UINT16 y, bool is_ex)
{
	struct rdp_backend *b = peerContext->rdpBackend;

	rdp_debug_verbose(b, "RDP mouse input%s: (%d, %d): flags:%x: ", is_ex ? "_ex" : "", x, y, flags);
	if (is_ex) {
		if (flags & PTR_XFLAGS_DOWN)
			rdp_debug_verbose_continue(b, "DOWN ");
		if (flags & PTR_XFLAGS_BUTTON1)
			rdp_debug_verbose_continue(b, "XBUTTON1 ");
		if (flags & PTR_XFLAGS_BUTTON2)
			rdp_debug_verbose_continue(b, "XBUTTON2 ");
	} else {
		if (flags & PTR_FLAGS_WHEEL)
			rdp_debug_verbose_continue(b, "WHEEL ");
		if (flags & PTR_FLAGS_WHEEL_NEGATIVE)
			rdp_debug_verbose_continue(b, "WHEEL_NEGATIVE ");
		if (flags & PTR_FLAGS_HWHEEL)
			rdp_debug_verbose_continue(b, "HWHEEL ");
		if (flags & PTR_FLAGS_MOVE)
			rdp_debug_verbose_continue(b, "MOVE ");
		if (flags & PTR_FLAGS_DOWN)
			rdp_debug_verbose_continue(b, "DOWN ");
		if (flags & PTR_FLAGS_BUTTON1)
			rdp_debug_verbose_continue(b, "BUTTON1 ");
		if (flags & PTR_FLAGS_BUTTON2)
			rdp_debug_verbose_continue(b, "BUTTON2 ");
		if (flags & PTR_FLAGS_BUTTON3)
			rdp_debug_verbose_continue(b, "BUTTON3 ");
	}
	rdp_debug_verbose_continue(b, "\n");
}

static void
rdp_validate_button_state(RdpPeerContext *peerContext, bool pressed, uint32_t *button)
{
	struct rdp_backend *b = peerContext->rdpBackend;
	uint32_t index;

	if (*button < BTN_LEFT || *button > BTN_EXTRA) {
		weston_log("RDP client posted invalid button event\n");
		goto ignore;
	}

	index = *button - BTN_LEFT;
	assert(index < ARRAY_LENGTH(peerContext->button_state));

	if (pressed == peerContext->button_state[index]) {
		rdp_debug_verbose(b, "%s: inconsistent button state button:%d (index:%d) pressed:%d\n",
				  __func__, *button, index, pressed);
		goto ignore;
	} else {
		peerContext->button_state[index] = pressed;
	}
	return;
ignore:
	/* ignore button input */
	*button = 0;
}

static bool
rdp_notify_wheel_scroll(RdpPeerContext *peerContext, UINT16 flags, uint32_t axis)
{
	struct weston_pointer_axis_event weston_event;
	struct rdp_backend *b = peerContext->rdpBackend;
	int ivalue;
	double value;
	struct timespec time;
	int *accumWheelRotationPrecise;
	int *accumWheelRotationDiscrete;

	/*
	* The RDP specs says the lower bits of flags contains the "the number of rotation
	* units the mouse wheel was rotated".
	*/
	ivalue = ((int)flags & 0x000000ff);
	if (flags & PTR_FLAGS_WHEEL_NEGATIVE)
		ivalue = (0xff - ivalue) * -1;

	/*
	* Flip the scroll direction as the RDP direction is inverse of X/Wayland
	* for vertical scroll
	*/
	if (axis == WL_POINTER_AXIS_VERTICAL_SCROLL) {
		ivalue *= -1;

		accumWheelRotationPrecise = &peerContext->verticalAccumWheelRotationPrecise;
		accumWheelRotationDiscrete = &peerContext->verticalAccumWheelRotationDiscrete;
	}
	else {
		accumWheelRotationPrecise = &peerContext->horizontalAccumWheelRotationPrecise;
		accumWheelRotationDiscrete = &peerContext->horizontalAccumWheelRotationDiscrete;
	}

	/*
	* Accumulate the wheel increments.
	*
	* Every 12 wheel increments, we will send an update to our Wayland
	* clients with an updated value for the wheel for smooth scrolling.
	*
	* Every 120 wheel increments, we tick one discrete wheel click.
	*
	* https://devblogs.microsoft.com/oldnewthing/20130123-00/?p=5473 explains the 120 value
	*/
	*accumWheelRotationPrecise += ivalue;
	*accumWheelRotationDiscrete += ivalue;
	rdp_debug_verbose(b, "wheel: rawValue:%d accumPrecise:%d accumDiscrete %d\n",
			  ivalue, *accumWheelRotationPrecise, *accumWheelRotationDiscrete);

	if (abs(*accumWheelRotationPrecise) >= 12) {
		value = (double)(*accumWheelRotationPrecise / 12);

		weston_event.axis = axis;
		weston_event.value = value;
		weston_event.discrete = *accumWheelRotationDiscrete / 120;
		weston_event.has_discrete = true;

		rdp_debug_verbose(b, "wheel: value:%f discrete:%d\n",
				  weston_event.value, weston_event.discrete);

		weston_compositor_get_time(&time);

		notify_axis(peerContext->item.seat, &time, &weston_event);

		*accumWheelRotationPrecise %= 12;
		*accumWheelRotationDiscrete %= 120;

		return true;
	}

	return false;
}

static BOOL
xf_mouseEvent(rdpInput *input, UINT16 flags, UINT16 x, UINT16 y)
{
	RdpPeerContext *peerContext = (RdpPeerContext *)input->context;
	uint32_t button = 0;
	bool need_frame = false;
	struct timespec time;

	dump_mouseinput(peerContext, flags, x, y, false);

	/* Per RDP spec, the x,y position is valid on all input mouse messages,
	 * except for PTR_FLAGS_WHEEL and PTR_FLAGS_HWHEEL event. Take the opportunity
	 * to resample our x,y position even when PTR_FLAGS_MOVE isn't explicitly set,
	 * for example a button down/up only notification, to ensure proper sync with
	 * the RDP client.
	 */
	if (!(flags & (PTR_FLAGS_WHEEL | PTR_FLAGS_HWHEEL))) {
		if (rdp_translate_and_notify_mouse_position(peerContext, x, y))
			need_frame = true;
	}

	if (flags & PTR_FLAGS_BUTTON1)
		button = BTN_LEFT;
	else if (flags & PTR_FLAGS_BUTTON2)
		button = BTN_RIGHT;
	else if (flags & PTR_FLAGS_BUTTON3)
		button = BTN_MIDDLE;

	if (button) {
		rdp_validate_button_state(peerContext,
					  flags & PTR_FLAGS_DOWN ? true : false,
					  &button);
	}

	if (button) {
		weston_compositor_get_time(&time);
		notify_button(peerContext->item.seat, &time, button,
			(flags & PTR_FLAGS_DOWN) ? WL_POINTER_BUTTON_STATE_PRESSED : WL_POINTER_BUTTON_STATE_RELEASED
		);
		need_frame = true;
	}

	/* Per RDP spec, if both PTRFLAGS_WHEEL and PTRFLAGS_HWHEEL are specified
	 * then PTRFLAGS_WHEEL takes precedent
	 */
	if (flags & PTR_FLAGS_WHEEL) {
		if (rdp_notify_wheel_scroll(peerContext, flags, WL_POINTER_AXIS_VERTICAL_SCROLL))
			need_frame = true;
	} else if (flags & PTR_FLAGS_HWHEEL) {
		if (rdp_notify_wheel_scroll(peerContext, flags, WL_POINTER_AXIS_HORIZONTAL_SCROLL))
			need_frame = true;
	}

	if (need_frame)
		notify_pointer_frame(peerContext->item.seat);

	return TRUE;
}

static BOOL
xf_extendedMouseEvent(rdpInput *input, UINT16 flags, UINT16 x, UINT16 y)
{
	RdpPeerContext *peerContext = (RdpPeerContext *)input->context;
	uint32_t button = 0;
	bool need_frame = false;
	struct rdp_output *output;
	struct timespec time;
	struct weston_coord_global pos;

	dump_mouseinput(peerContext, flags, x, y, true);

	if (flags & PTR_XFLAGS_BUTTON1)
		button = BTN_SIDE;
	else if (flags & PTR_XFLAGS_BUTTON2)
		button = BTN_EXTRA;

	if (button) {
		rdp_validate_button_state(peerContext,
					  flags & PTR_XFLAGS_DOWN ? true : false,
					  &button);
	}

	if (button) {
		weston_compositor_get_time(&time);
		notify_button(peerContext->item.seat, &time, button,
			      (flags & PTR_XFLAGS_DOWN) ? WL_POINTER_BUTTON_STATE_PRESSED : WL_POINTER_BUTTON_STATE_RELEASED);
		need_frame = true;
	}

	output = rdp_get_first_output(peerContext->rdpBackend);
	if (x < output->base.width && y < output->base.height) {
		weston_compositor_get_time(&time);
		pos.c = weston_coord(x, y);
		notify_motion_absolute(peerContext->item.seat, &time, pos);
		need_frame = true;
	}

	if (need_frame)
		notify_pointer_frame(peerContext->item.seat);

	return TRUE;
}


static BOOL
xf_input_synchronize_event(rdpInput *input, UINT32 flags)
{
	freerdp_peer *client = input->context->peer;
	RdpPeerContext *peerCtx = (RdpPeerContext *)input->context;
	struct rdp_backend *b = peerCtx->rdpBackend;
	struct rdp_output *output = rdp_get_first_output(b);
	struct weston_keyboard *keyboard;

        rdp_debug_verbose(b, "RDP backend: %s ScrLk:%d, NumLk:%d, CapsLk:%d, KanaLk:%d\n",
			  __func__,
			  flags & KBD_SYNC_SCROLL_LOCK ? 1 : 0,
			  flags & KBD_SYNC_NUM_LOCK ? 1 : 0,
			  flags & KBD_SYNC_CAPS_LOCK ? 1 : 0,
			  flags & KBD_SYNC_KANA_LOCK ? 1 : 0);

	keyboard = weston_seat_get_keyboard(peerCtx->item.seat);
	if (keyboard) {
		uint32_t value = 0;

		if (flags & KBD_SYNC_NUM_LOCK)
			value |= WESTON_NUM_LOCK;
		if (flags & KBD_SYNC_CAPS_LOCK)
			value |= WESTON_CAPS_LOCK;
		weston_keyboard_set_locks(keyboard,
					  WESTON_NUM_LOCK | WESTON_CAPS_LOCK,
					  value);
	}

	rdp_full_refresh(client, output);

	return TRUE;
}


static BOOL
xf_input_keyboard_event(rdpInput *input, UINT16 flags, UINT16 code)
{
	uint32_t scan_code, vk_code, full_code;
	enum wl_keyboard_key_state keyState;
	freerdp_peer *client = input->context->peer;
	RdpPeerContext *peerContext = (RdpPeerContext *)input->context;
	bool send_release_key = false;
	int notify = 0;
	struct timespec time;

	if (!(peerContext->item.flags & RDP_PEER_ACTIVATED))
		return TRUE;

	if (flags & KBD_FLAGS_DOWN) {
		keyState = WL_KEYBOARD_KEY_STATE_PRESSED;
		notify = 1;
	} else if (flags & KBD_FLAGS_RELEASE) {
		keyState = WL_KEYBOARD_KEY_STATE_RELEASED;
		notify = 1;
	}

	if (notify) {
		full_code = code;
		if (flags & KBD_FLAGS_EXTENDED)
			full_code |= KBD_FLAGS_EXTENDED;

		/* Korean keyboard support:
		 * WinPR's GetVirtualKeyCodeFromVirtualScanCode() can't handle hangul/hanja keys
		 * hanja and hangeul keys are only present on Korean 103 keyboard (Type 8:SubType 6) */
		if (client->context->settings->KeyboardType == 8 &&
		    client->context->settings->KeyboardSubType == 6 &&
		    ((full_code == (KBD_FLAGS_EXTENDED | ATKBD_RET_HANJA)) ||
		     (full_code == (KBD_FLAGS_EXTENDED | ATKBD_RET_HANGEUL)))) {
			if (full_code == (KBD_FLAGS_EXTENDED | ATKBD_RET_HANJA))
				vk_code = VK_HANJA;
			else if (full_code == (KBD_FLAGS_EXTENDED | ATKBD_RET_HANGEUL))
				vk_code = VK_HANGUL;
			/* From Linux's keyboard driver at drivers/input/keyboard/atkbd.c */
			/*
			 * HANGEUL and HANJA keys do not send release events so we need to
			 * generate such events ourselves
			 */
			/* Similarly, for RDP there is no release for those 2 Korean keys,
			 * thus generate release right after press. */
			if (keyState != WL_KEYBOARD_KEY_STATE_PRESSED) {
				weston_log("RDP: Received invalid key release\n");
				return TRUE;
			}
			send_release_key = true;
		} else {
			vk_code = GetVirtualKeyCodeFromVirtualScanCode(full_code, client->context->settings->KeyboardType);
		}
		/* Korean keyboard support */
		/* WinPR's GetKeycodeFromVirtualKeyCode() expects no extended bit for VK_HANGUL and VK_HANJA */
		if (vk_code != VK_HANGUL && vk_code != VK_HANJA)
			if (flags & KBD_FLAGS_EXTENDED)
				vk_code |= KBDEXT;

		scan_code = GetKeycodeFromVirtualKeyCode(vk_code, KEYCODE_TYPE_EVDEV);

		/*weston_log("code=%x ext=%d vk_code=%x scan_code=%x\n", code, (flags & KBD_FLAGS_EXTENDED) ? 1 : 0,
				vk_code, scan_code);*/
		weston_compositor_get_time(&time);
		notify_key(peerContext->item.seat, &time,
					scan_code - 8, keyState, STATE_UPDATE_AUTOMATIC);

		if (send_release_key) {
			notify_key(peerContext->item.seat, &time,
				   scan_code - 8,
				   WL_KEYBOARD_KEY_STATE_RELEASED,
				   STATE_UPDATE_AUTOMATIC);
		}
	}

	return TRUE;
}

static BOOL
xf_input_unicode_keyboard_event(rdpInput *input, UINT16 flags, UINT16 code)
{
	RdpPeerContext *peerContext = (RdpPeerContext *)input->context;
	struct rdp_backend *b = peerContext->rdpBackend;

	rdp_debug(b, "Client sent a unicode keyboard event (flags:0x%X code:0x%X)\n", flags, code);

	return TRUE;
}


static BOOL
xf_suppress_output(rdpContext *context, BYTE allow, const RECTANGLE_16 *area)
{
	RdpPeerContext *peerContext = (RdpPeerContext *)context;

	if (allow)
		peerContext->item.flags |= RDP_PEER_OUTPUT_ENABLED;
	else
		peerContext->item.flags &= (~RDP_PEER_OUTPUT_ENABLED);

	return TRUE;
}

static BOOL
xf_peer_adjust_monitor_layout(freerdp_peer *client)
{
	RdpPeerContext *peerCtx = (RdpPeerContext *)client->context;
	struct rdp_backend *b = peerCtx->rdpBackend;
	rdpSettings *settings = client->context->settings;
	rdpMonitor *monitors;
	unsigned int monitor_count;
	BOOL success;
	bool fallback = false;
	unsigned int i;

	rdp_debug(b, "%s:\n", __func__);
	rdp_debug(b, "  DesktopWidth:%d, DesktopHeight:%d\n", settings->DesktopWidth, settings->DesktopHeight);
	rdp_debug(b, "  UseMultimon:%d\n", settings->UseMultimon);
	rdp_debug(b, "  ForceMultimon:%d\n", settings->ForceMultimon);
	rdp_debug(b, "  MonitorCount:%d\n", settings->MonitorCount);
	rdp_debug(b, "  HasMonitorAttributes:%d\n", settings->HasMonitorAttributes);
	rdp_debug(b, "  HiDefRemoteApp:%d\n", settings->HiDefRemoteApp);

	if (settings->MonitorCount > 1) {
		weston_log("multiple monitor is not supported");
		fallback = true;
	}

	if (b->no_clients_resize)
		fallback = true;

	if (settings->MonitorCount > RDP_MAX_MONITOR) {
		weston_log("Client reports more monitors then expected:(%d)\n",
			   settings->MonitorCount);
		return FALSE;
	}
	if ((settings->MonitorCount > 0 && settings->MonitorDefArray) && !fallback) {
		rdpMonitor *rdp_monitor = settings->MonitorDefArray;
		monitor_count = settings->MonitorCount;
		monitors = xmalloc(sizeof(*monitors) * monitor_count);
		for (i = 0; i < monitor_count; i++) {
			monitors[i] = rdp_monitor[i];
			if (!settings->HasMonitorAttributes) {
				monitors[i].attributes.physicalWidth = 0;
				monitors[i].attributes.physicalHeight = 0;
				monitors[i].attributes.orientation = ORIENTATION_LANDSCAPE;
				monitors[i].attributes.desktopScaleFactor = 100;
				monitors[i].attributes.deviceScaleFactor = 100;
			}
		}
	} else {
		monitor_count = 1;
		monitors = xmalloc(sizeof(*monitors) * monitor_count);
		/* when no monitor array provided, generate from desktop settings */
		monitors[0].x = 0;
		monitors[0].y = 0;
		monitors[0].width = settings->DesktopWidth;
		monitors[0].height = settings->DesktopHeight;
		monitors[0].is_primary = 1;
		monitors[0].attributes.physicalWidth = settings->DesktopPhysicalWidth;
		monitors[0].attributes.physicalHeight = settings->DesktopPhysicalHeight;
		monitors[0].attributes.orientation = settings->DesktopOrientation;
		monitors[0].attributes.desktopScaleFactor = settings->DesktopScaleFactor;
		monitors[0].attributes.deviceScaleFactor = settings->DeviceScaleFactor;
		monitors[0].orig_screen = 0;

		if (b->no_clients_resize) {
			/* If we're not allowing clients to resize us, set these
			 * to 0 so the front end knows it needs to make something
			 * up.
			 */
			monitors[0].width = 0;
			monitors[0].height = 0;
			monitors[0].attributes.desktopScaleFactor = 0;
		}
	}
	success = handle_adjust_monitor_layout(client, monitor_count, monitors);

	free(monitors);
	return success;
}

static int
rdp_peer_init(freerdp_peer *client, struct rdp_backend *b)
{
	int handle_count = 0;
	HANDLE handles[MAX_FREERDP_FDS + 1]; /* +1 for virtual channel */
	int i, fd;
	struct wl_event_loop *loop;
	rdpSettings	*settings;
	rdpInput *input;
	RdpPeerContext *peerCtx;

	client->ContextSize = sizeof(RdpPeerContext);
	client->ContextNew = (psPeerContextNew)rdp_peer_context_new;
	client->ContextFree = (psPeerContextFree)rdp_peer_context_free;
	freerdp_peer_context_new(client);

	peerCtx = (RdpPeerContext *) client->context;
	peerCtx->rdpBackend = b;

	settings = client->context->settings;
	/* configure security settings */
	if (b->rdp_key)
		settings->RdpKeyFile = strdup(b->rdp_key);
	if (b->tls_enabled) {
		settings->CertificateFile = strdup(b->server_cert);
		settings->PrivateKeyFile = strdup(b->server_key);
	} else {
		settings->TlsSecurity = FALSE;
	}
	settings->NlaSecurity = FALSE;

	if (!client->Initialize(client)) {
		weston_log("peer initialization failed\n");
		goto error_initialize;
	}

	settings->OsMajorType = OSMAJORTYPE_UNIX;
	settings->OsMinorType = OSMINORTYPE_PSEUDO_XSERVER;
	settings->ColorDepth = 32;
	settings->RefreshRect = TRUE;
	settings->RemoteFxCodec = b->remotefx_codec;
	settings->NSCodec = TRUE;
	settings->FrameMarkerCommandEnabled = TRUE;
	settings->SurfaceFrameMarkerEnabled = TRUE;
	settings->RedirectClipboard = TRUE;
	settings->HasExtendedMouseEvent = TRUE;
	settings->HasHorizontalWheel = TRUE;

	client->Capabilities = xf_peer_capabilities;
	client->PostConnect = xf_peer_post_connect;
	client->Activate = xf_peer_activate;

	if (!b->no_clients_resize) {
		settings->SupportMonitorLayoutPdu = TRUE;
		client->AdjustMonitorsLayout = xf_peer_adjust_monitor_layout;
	}

	client->context->update->SuppressOutput = (pSuppressOutput)xf_suppress_output;

	input = client->context->input;
	input->SynchronizeEvent = xf_input_synchronize_event;
	input->MouseEvent = xf_mouseEvent;
	input->ExtendedMouseEvent = xf_extendedMouseEvent;
	input->KeyboardEvent = xf_input_keyboard_event;
	input->UnicodeKeyboardEvent = xf_input_unicode_keyboard_event;

	handle_count = client->GetEventHandles(client, handles, MAX_FREERDP_FDS);
	if (!handle_count) {
		weston_log("unable to retrieve client handles\n");
		goto error_initialize;
	}

	PWtsApiFunctionTable fn = FreeRDP_InitWtsApi();
	WTSRegisterWtsApiFunctionTable(fn);
	peerCtx->vcm = WTSOpenServerA((LPSTR)peerCtx);
	if (peerCtx->vcm) {
		handles[handle_count++] = WTSVirtualChannelManagerGetEventHandle(peerCtx->vcm);
	} else {
		weston_log("WTSOpenServer is failed! continue without virtual channel.\n");
	}

	loop = wl_display_get_event_loop(b->compositor->wl_display);
	for (i = 0; i < handle_count; i++) {
		fd = GetEventFileDescriptor(handles[i]);

		peerCtx->events[i] = wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
				rdp_client_activity, client);
	}
	for ( ; i < (int)ARRAY_LENGTH(peerCtx->events); i++)
		peerCtx->events[i] = 0;

	wl_list_insert(&b->peers, &peerCtx->item.link);

	if (!rdp_initialize_dispatch_task_event_source(peerCtx))
		goto error_dispatch_initialize;

	return 0;

error_dispatch_initialize:
	for (i = 0; i < (int)ARRAY_LENGTH(peerCtx->events); i++) {
		if (peerCtx->events[i]) {
			wl_event_source_remove(peerCtx->events[i]);
			peerCtx->events[i] = NULL;
		}
	}
	if (peerCtx->vcm) {
		WTSCloseServer(peerCtx->vcm);
		peerCtx->vcm = NULL;
	}

error_initialize:
	client->Close(client);
	return -1;
}


static BOOL
rdp_incoming_peer(freerdp_listener *instance, freerdp_peer *client)
{
	struct rdp_backend *b = (struct rdp_backend *)instance->param4;
	if (rdp_peer_init(client, b) < 0) {
		weston_log("error when treating incoming peer\n");
		return FALSE;
	}

	return TRUE;
}

static const struct weston_rdp_output_api api = {
	rdp_head_get_monitor,
	rdp_output_set_mode,
};

static const uint32_t rdp_formats[] = {
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ARGB8888,
};

static struct rdp_backend *
rdp_backend_create(struct weston_compositor *compositor,
		   struct weston_rdp_backend_config *config)
{
	struct rdp_backend *b;
	char *fd_str;
	char *fd_tail;
	int fd, ret;

	struct weston_head *base, *next;

	b = xzalloc(sizeof *b);
	b->compositor_tid = gettid();
	b->compositor = compositor;
	b->base.shutdown = rdp_shutdown;
	b->base.destroy = rdp_destroy;
	b->base.create_output = rdp_output_create;
	b->rdp_key = config->rdp_key ? strdup(config->rdp_key) : NULL;
	b->no_clients_resize = config->no_clients_resize;
	b->force_no_compression = config->force_no_compression;
	b->remotefx_codec = config->remotefx_codec;
	b->audio_in_setup = config->audio_in_setup;
	b->audio_in_teardown = config->audio_in_teardown;
	b->audio_out_setup = config->audio_out_setup;
	b->audio_out_teardown = config->audio_out_teardown;

	b->debug = weston_compositor_add_log_scope(compositor,
						   "rdp-backend",
						   "Debug messages from RDP backend\n",
						   NULL, NULL, NULL);
	b->verbose = weston_compositor_add_log_scope(compositor,
						     "rdp-backend-verbose",
						     "Verbose debug messages from RDP backend\n",
						     NULL, NULL, NULL);

	/* After here, rdp_debug() is ready to be used */

	b->rdp_monitor_refresh_rate = config->refresh_rate * 1000;
	rdp_debug(b, "RDP backend: WESTON_RDP_MONITOR_REFRESH_RATE: %d\n", b->rdp_monitor_refresh_rate);

	b->clipboard_debug = weston_log_ctx_add_log_scope(b->compositor->weston_log_ctx,
							  "rdp-backend-clipboard",
							  "Debug messages from RDP backend clipboard\n",
							  NULL, NULL, NULL);
	b->clipboard_verbose = weston_log_ctx_add_log_scope(b->compositor->weston_log_ctx,
							    "rdp-backend-clipboard-verbose",
							    "Debug messages from RDP backend clipboard\n",
							    NULL, NULL, NULL);

	wl_list_insert(&compositor->backend_list, &b->base.link);

	if (config->server_cert && config->server_key) {
		b->server_cert = strdup(config->server_cert);
		b->server_key = strdup(config->server_key);
		if (!b->server_cert || !b->server_key)
			goto err_free_strings;
	}

	/* if we are listening for client connections on an external listener
	 * fd, we don't need to enforce TLS or RDP security, since FreeRDP
	 * will consider it to be a local connection */
	fd = config->external_listener_fd;
	if (fd < 0) {
		if (!b->rdp_key && (!b->server_cert || !b->server_key)) {
			weston_log("the RDP compositor requires keys and an optional certificate for RDP or TLS security ("
				   "--rdp4-key or --rdp-tls-cert/--rdp-tls-key)\n");
			goto err_free_strings;
		}
		if (b->server_cert && b->server_key) {
			b->tls_enabled = 1;
			rdp_debug(b, "TLS support activated\n");
		}
	}

	wl_list_init(&b->peers);

	b->base.supported_presentation_clocks =
			WESTON_PRESENTATION_CLOCKS_SOFTWARE;

	b->formats_count = ARRAY_LENGTH(rdp_formats);
	b->formats = pixel_format_get_array(rdp_formats, b->formats_count);

	if (!compositor->renderer) {
		switch (config->renderer) {
		case WESTON_RENDERER_PIXMAN:
		case WESTON_RENDERER_AUTO:
			if (weston_compositor_init_renderer(compositor, WESTON_RENDERER_PIXMAN,
							    NULL) < 0)
				goto err_compositor;
			break;
		case WESTON_RENDERER_GL: {
			const struct gl_renderer_display_options options = {
				.egl_platform = EGL_PLATFORM_SURFACELESS_MESA,
				.formats = b->formats,
				.formats_count = b->formats_count,
			};

			if (weston_compositor_init_renderer(compositor,
							    WESTON_RENDERER_GL,
							    &options.base) < 0)
					goto err_compositor;
			break;
		}
		default:
			weston_log("Unsupported renderer requested\n");
			goto err_free_strings;
		}
	}

	rdp_head_create(b, NULL);

	compositor->capabilities |= WESTON_CAP_ARBITRARY_MODES;

	if (!config->env_socket) {
		b->listener = freerdp_listener_new();
		b->listener->PeerAccepted = rdp_incoming_peer;
		b->listener->param4 = b;
		if (fd >= 0) {
			rdp_debug(b, "Using external fd for incoming connections: %d\n", fd);

			if (!b->listener->OpenFromSocket(b->listener, fd)) {
				weston_log("RDP unable to use external listener fd: %d\n", fd);
				goto err_listener;
			}
		} else {
			if (!b->listener->Open(b->listener, config->bind_address, config->port)) {
				weston_log("RDP unable to bind socket\n");
				goto err_listener;
			}
		}

		if (rdp_implant_listener(b, b->listener) < 0)
			goto err_listener;
	} else {
		/* get the socket from RDP_FD var */
		fd_str = getenv("RDP_FD");
		if (!fd_str) {
			weston_log("RDP_FD env variable not set\n");
			goto err_compositor;
		}

		fd = strtoul(fd_str, &fd_tail, 10);
		if (errno != 0 || fd_tail == fd_str || *fd_tail != '\0'
		    || rdp_peer_init(freerdp_peer_new(fd), b))
			goto err_compositor;
	}

	ret = weston_plugin_api_register(compositor, WESTON_RDP_OUTPUT_API_NAME,
					 &api, sizeof(api));

	if (ret < 0) {
		weston_log("Failed to register output API.\n");
		goto err_listener;
	}

	return b;

err_listener:
	freerdp_listener_free(b->listener);
err_compositor:
	wl_list_for_each_safe(base, next, &compositor->head_list, compositor_link) {
		if (to_rdp_head(base))
			rdp_head_destroy(base);
	}
err_free_strings:
	wl_list_remove(&b->base.link);
	if (b->clipboard_debug)
		weston_log_scope_destroy(b->clipboard_debug);
	if (b->clipboard_verbose)
		weston_log_scope_destroy(b->clipboard_verbose);
	if (b->debug)
		weston_log_scope_destroy(b->debug);
	if (b->verbose)
		weston_log_scope_destroy(b->verbose);
	free(b->rdp_key);
	free(b->server_cert);
	free(b->server_key);
	free(b);
	return NULL;
}

static void
config_init_to_defaults(struct weston_rdp_backend_config *config)
{
	config->renderer = WESTON_RENDERER_AUTO;
	config->bind_address = NULL;
	config->port = 3389;
	config->rdp_key = NULL;
	config->server_cert = NULL;
	config->server_key = NULL;
	config->env_socket = 0;
	config->no_clients_resize = 0;
	config->force_no_compression = 0;
	config->remotefx_codec = true;
	config->external_listener_fd = -1;
	config->refresh_rate = RDP_DEFAULT_FREQ;
	config->audio_in_setup = NULL;
	config->audio_in_teardown = NULL;
	config->audio_out_setup = NULL;
	config->audio_out_teardown = NULL;
}

WL_EXPORT int
weston_backend_init(struct weston_compositor *compositor,
		    struct weston_backend_config *config_base)
{
	struct rdp_backend *b;
	struct weston_rdp_backend_config config = {{ 0, }};
	int major, minor, revision;

#if FREERDP_VERSION_MAJOR >= 2
	winpr_InitializeSSL(0);
#endif
	freerdp_get_version(&major, &minor, &revision);
	weston_log("using FreeRDP version %d.%d.%d\n", major, minor, revision);

	if (config_base == NULL ||
	    config_base->struct_version != WESTON_RDP_BACKEND_CONFIG_VERSION ||
	    config_base->struct_size > sizeof(struct weston_rdp_backend_config)) {
		weston_log("RDP backend config structure is invalid\n");
		return -1;
	}

	if (compositor->renderer) {
		switch (compositor->renderer->type) {
		case WESTON_RENDERER_PIXMAN:
		case WESTON_RENDERER_GL:
			break;
		default:
			weston_log("Renderer not supported by RDP backend\n");
			return -1;
		}
	}

	config_init_to_defaults(&config);
	memcpy(&config, config_base, config_base->struct_size);

	b = rdp_backend_create(compositor, &config);
	if (b == NULL)
		return -1;
	return 0;
}