Implement a "well" defined API to configure the wayland backend.
Following according to discution about libweston API.
---
V0:
 - Nothing particular.

Signed-off-by: Benoit Gschwind <[email protected]>

 Makefile.am          |  1 +
 src/compositor-rdp.c | 71 +++++++++++++++++++++-------------------------------
 src/compositor-rdp.h | 54 +++++++++++++++++++++++++++++++++++++++
 src/main.c           | 56 +++++++++++++++++++++++++++++++++++++++--
 4 files changed, 137 insertions(+), 45 deletions(-)
 create mode 100644 src/compositor-rdp.h

diff --git a/Makefile.am b/Makefile.am
index c042c68..a4dcd57 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -73,6 +73,7 @@ weston_SOURCES =                                      \
        src/compositor.c                                \
        src/compositor.h                                \
        src/compositor-headless.h               \
+       src/compositor-rdp.h            \
        src/input.c                                     \
        src/data-device.c                               \
        src/screenshooter.c                             \
diff --git a/src/compositor-rdp.c b/src/compositor-rdp.c
index 773b6b5..2860556 100644
--- a/src/compositor-rdp.c
+++ b/src/compositor-rdp.c
@@ -67,23 +67,13 @@
 
 #include "shared/helpers.h"
 #include "compositor.h"
+#include "compositor-rdp.h"
 #include "pixman-renderer.h"
 
 #define MAX_FREERDP_FDS 32
 #define DEFAULT_AXIS_STEP_DISTANCE 10
 #define RDP_MODE_FREQ 60 * 1000
 
-struct rdp_backend_config {
-       int width;
-       int height;
-       char *bind_address;
-       int port;
-       char *rdp_key;
-       char *server_cert;
-       char *server_key;
-       int env_socket;
-       int no_clients_resize;
-};
 
 struct rdp_output;
 
@@ -138,20 +128,6 @@ struct rdp_peer_context {
 typedef struct rdp_peer_context RdpPeerContext;
 
 static void
-rdp_backend_config_init(struct rdp_backend_config *config)
-{
-       config->width = 640;
-       config->height = 480;
-       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;
-}
-
-static void
 rdp_peer_refresh_rfx(pixman_region32_t *damage, pixman_image_t *image, 
freerdp_peer *peer)
 {
        int width, height, nrects, i;
@@ -1195,8 +1171,7 @@ rdp_incoming_peer(freerdp_listener *instance, 
freerdp_peer *client)
 
 static struct rdp_backend *
 rdp_backend_create(struct weston_compositor *compositor,
-                  struct rdp_backend_config *config,
-                  int *argc, char *argv[], struct weston_config *wconfig)
+                  struct weston_rdp_backend_config *config)
 {
        struct rdp_backend *b;
        char *fd_str;
@@ -1274,39 +1249,49 @@ err_free_strings:
        return NULL;
 }
 
+static void
+config_init_to_defaults(struct weston_rdp_backend_config *config)
+{
+       config->width = 640;
+       config->height = 480;
+       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;
+}
+
 WL_EXPORT int
 backend_init(struct weston_compositor *compositor, int *argc, char *argv[],
             struct weston_config *wconfig,
             struct weston_backend_config *config_base)
 {
        struct rdp_backend *b;
-       struct rdp_backend_config config;
-       rdp_backend_config_init(&config);
+       struct weston_rdp_backend_config config = {{ 0, }};
        int major, minor, revision;
 
        freerdp_get_version(&major, &minor, &revision);
        weston_log("using FreeRDP version %d.%d.%d\n", major, minor, revision);
 
-       const struct weston_option rdp_options[] = {
-               { WESTON_OPTION_BOOLEAN, "env-socket", 0, &config.env_socket },
-               { WESTON_OPTION_INTEGER, "width", 0, &config.width },
-               { WESTON_OPTION_INTEGER, "height", 0, &config.height },
-               { WESTON_OPTION_STRING,  "address", 0, &config.bind_address },
-               { WESTON_OPTION_INTEGER, "port", 0, &config.port },
-               { WESTON_OPTION_BOOLEAN, "no-clients-resize", 0, 
&config.no_clients_resize },
-               { WESTON_OPTION_STRING,  "rdp4-key", 0, &config.rdp_key },
-               { WESTON_OPTION_STRING,  "rdp-tls-cert", 0, &config.server_cert 
},
-               { WESTON_OPTION_STRING,  "rdp-tls-key", 0, &config.server_key }
-       };
-
-       parse_options(rdp_options, ARRAY_LENGTH(rdp_options), argc, argv);
+       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;
+       }
+
+       config_init_to_defaults(&config);
+       memcpy(&config, config_base, config_base->struct_size);
+
        if (!config.rdp_key && (!config.server_cert || !config.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");
                return -1;
        }
 
-       b = rdp_backend_create(compositor, &config, argc, argv, wconfig);
+       b = rdp_backend_create(compositor, &config);
        if (b == NULL)
                return -1;
        return 0;
diff --git a/src/compositor-rdp.h b/src/compositor-rdp.h
new file mode 100644
index 0000000..dfa1759
--- /dev/null
+++ b/src/compositor-rdp.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2016 Benoit Gschwind
+ *
+ * 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.
+ */
+
+#ifndef WESTON_COMPOSITOR_RDP_H
+#define WESTON_COMPOSITOR_RDP_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+#include "compositor.h"
+
+#define WESTON_RDP_BACKEND_CONFIG_VERSION 1
+
+struct weston_rdp_backend_config {
+       struct weston_backend_config base;
+       int width;
+       int height;
+       char *bind_address;
+       int port;
+       char *rdp_key;
+       char *server_cert;
+       char *server_key;
+       int env_socket;
+       int no_clients_resize;
+};
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* WESTON_COMPOSITOR_RDP_H */
diff --git a/src/main.c b/src/main.c
index fc97dd8..55da7b2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -48,6 +48,7 @@
 #include "version.h"
 
 #include "compositor-headless.h"
+#include "compositor-rdp.h"
 
 static struct wl_list child_process_list;
 static struct weston_compositor *segv_compositor;
@@ -717,12 +718,65 @@ load_headless_backend(struct weston_compositor *c, char 
const * backend,
        return ret;
 }
 
+static void
+weston_rdp_backend_config_init(struct weston_rdp_backend_config *config)
+{
+       config->base.struct_version = WESTON_RDP_BACKEND_CONFIG_VERSION;
+       config->base.struct_size = sizeof(struct weston_rdp_backend_config);
+
+       config->width = 640;
+       config->height = 480;
+       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;
+}
+
+static int
+load_rdp_backend(struct weston_compositor *c, char const * backend,
+               int *argc, char *argv[], struct weston_config *wc)
+{
+       struct weston_rdp_backend_config config  = {{ 0, }};
+       int ret = 0;
+
+       weston_rdp_backend_config_init(&config);
+
+       const struct weston_option rdp_options[] = {
+               { WESTON_OPTION_BOOLEAN, "env-socket", 0, &config.env_socket },
+               { WESTON_OPTION_INTEGER, "width", 0, &config.width },
+               { WESTON_OPTION_INTEGER, "height", 0, &config.height },
+               { WESTON_OPTION_STRING,  "address", 0, &config.bind_address },
+               { WESTON_OPTION_INTEGER, "port", 0, &config.port },
+               { WESTON_OPTION_BOOLEAN, "no-clients-resize", 0, 
&config.no_clients_resize },
+               { WESTON_OPTION_STRING,  "rdp4-key", 0, &config.rdp_key },
+               { WESTON_OPTION_STRING,  "rdp-tls-cert", 0, &config.server_cert 
},
+               { WESTON_OPTION_STRING,  "rdp-tls-key", 0, &config.server_key }
+       };
+
+       parse_options(rdp_options, ARRAY_LENGTH(rdp_options), argc, argv);
+
+       ret = load_backend_new(c, backend, &config.base);
+
+       free(config.bind_address);
+       free(config.rdp_key);
+       free(config.server_cert);
+       free(config.server_key);
+       return ret;
+
+}
+
+
 static int
 load_backend(struct weston_compositor *compositor, const char *backend,
             int *argc, char **argv, struct weston_config *config)
 {
        if (strstr(backend, "headless-backend.so"))
                return load_headless_backend(compositor, backend, argc, argv, 
config);
+       else if (strstr(backend, "rdp-backend.so"))
+               return load_rdp_backend(compositor, backend, argc, argv, 
config);
 #if 0
        else if (strstr(backend, "drm-backend.so"))
                return load_drm_backend(compositor, backend, argc, argv, 
config);
@@ -734,8 +788,6 @@ load_backend(struct weston_compositor *compositor, const 
char *backend,
                return load_fbdev_backend(compositor, backend, argc, argv, 
config);
        else if (strstr(backend, "rpi-backend.so"))
                return load_rpi_backend(compositor, backend, argc, argv, 
config);
-       else if (strstr(backend, "rdp-backend.so"))
-               return load_rdp_backend(compositor, backend, argc, argv, 
config);
 #endif
 
        return load_backend_old(compositor, backend, argc, argv, config);
-- 
2.7.3

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