---
 src/wayland-private.h |  4 ++++
 src/wayland-server.c  | 19 +++++++++++++++++++
 src/wayland-server.h  |  3 +++
 src/wayland-shm.c     | 45 ++++++++++++++++++++++++++++++++-------------
 4 files changed, 58 insertions(+), 13 deletions(-)

diff --git a/src/wayland-private.h b/src/wayland-private.h
index a7d68c1..0126694 100644
--- a/src/wayland-private.h
+++ b/src/wayland-private.h
@@ -29,6 +29,7 @@
 
 #define WL_HIDE_DEPRECATED 1
 
+#include "wayland-server.h"
 #include "wayland-util.h"
 
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
@@ -176,4 +177,7 @@ extern wl_log_func_t wl_log_handler;
 
 void wl_log(const char *fmt, ...);
 
+struct wl_array *
+wl_display_get_additional_shm_formats(struct wl_display *display);
+
 #endif
diff --git a/src/wayland-server.c b/src/wayland-server.c
index 0a6e112..f3395df 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -92,6 +92,8 @@ struct wl_display {
        struct wl_list client_list;
 
        struct wl_signal destroy_signal;
+
+       struct wl_array additional_shm_formats;
 };
 
 struct wl_global {
@@ -717,6 +719,8 @@ wl_display_create(void)
        display->id = 1;
        display->serial = 0;
 
+       wl_array_init(&display->additional_shm_formats);
+
        if (!wl_global_create(display, &wl_display_interface, 1,
                              display, bind_display)) {
                wl_event_loop_destroy(display->loop);
@@ -1174,3 +1178,18 @@ wl_display_remove_global(struct wl_display *display, 
struct wl_global *global)
 {
        wl_global_destroy(global);
 }
+
+WL_EXPORT void
+wl_display_add_shm_format(struct wl_display *display, uint32_t format)
+{
+       uint32_t *p;
+
+       p = wl_array_add(&display->additional_shm_formats, sizeof *p);
+       *p = format;
+}
+
+struct wl_array *
+wl_display_get_additional_shm_formats(struct wl_display *display)
+{
+       return &display->additional_shm_formats;
+}
diff --git a/src/wayland-server.h b/src/wayland-server.h
index 9e16d0e..de389ea 100644
--- a/src/wayland-server.h
+++ b/src/wayland-server.h
@@ -321,6 +321,9 @@ wl_shm_buffer_get_height(struct wl_shm_buffer *buffer);
 int
 wl_display_init_shm(struct wl_display *display);
 
+void
+wl_display_add_shm_format(struct wl_display *display, uint32_t format);
+
 struct wl_shm_buffer *
 wl_shm_buffer_create(struct wl_client *client,
                     uint32_t id, int32_t width, int32_t height,
diff --git a/src/wayland-shm.c b/src/wayland-shm.c
index 1699058..eff29c3 100644
--- a/src/wayland-shm.c
+++ b/src/wayland-shm.c
@@ -83,6 +83,27 @@ static const struct wl_buffer_interface shm_buffer_interface 
= {
        shm_buffer_destroy
 };
 
+static int
+format_is_supported(struct wl_client *client, uint32_t format)
+{
+       struct wl_display *display = wl_client_get_display(client);
+       struct wl_array *formats;
+       uint32_t *p;
+
+       switch (format) {
+       case WL_SHM_FORMAT_ARGB8888:
+       case WL_SHM_FORMAT_XRGB8888:
+               return 1;
+       default:
+               formats = wl_display_get_additional_shm_formats(display);
+               wl_array_for_each(p, formats)
+                       if(*p == format)
+                               return 1;
+       }
+
+       return 0;
+}
+
 static void
 shm_pool_create_buffer(struct wl_client *client, struct wl_resource *resource,
                       uint32_t id, int32_t offset,
@@ -92,14 +113,10 @@ shm_pool_create_buffer(struct wl_client *client, struct 
wl_resource *resource,
        struct wl_shm_pool *pool = wl_resource_get_user_data(resource);
        struct wl_shm_buffer *buffer;
 
-       switch (format) {
-       case WL_SHM_FORMAT_ARGB8888:
-       case WL_SHM_FORMAT_XRGB8888:
-               break;
-       default:
+       if (!format_is_supported(client, format)) {
                wl_resource_post_error(resource,
                                       WL_SHM_ERROR_INVALID_FORMAT,
-                                      "invalid format");
+                                      "invalid format 0x%x", format);
                return;
        }
 
@@ -242,6 +259,9 @@ bind_shm(struct wl_client *client,
         void *data, uint32_t version, uint32_t id)
 {
        struct wl_resource *resource;
+       struct wl_display *display = wl_client_get_display(client);
+       struct wl_array *additional_formats;
+       uint32_t *p;
 
        resource = wl_resource_create(client, &wl_shm_interface, 1, id);
        if (!resource) {
@@ -253,6 +273,10 @@ bind_shm(struct wl_client *client,
 
        wl_shm_send_format(resource, WL_SHM_FORMAT_ARGB8888);
        wl_shm_send_format(resource, WL_SHM_FORMAT_XRGB8888);
+
+       additional_formats = wl_display_get_additional_shm_formats(display);
+       wl_array_for_each(p, additional_formats)
+               wl_shm_send_format(resource, *p);
 }
 
 WL_EXPORT int
@@ -270,14 +294,9 @@ wl_shm_buffer_create(struct wl_client *client,
                     int32_t stride, uint32_t format)
 {
        struct wl_shm_buffer *buffer;
-                            
-       switch (format) {
-       case WL_SHM_FORMAT_ARGB8888:
-       case WL_SHM_FORMAT_XRGB8888:
-               break;
-       default:
+
+       if (!format_is_supported(client, format))
                return NULL;
-       }
 
        buffer = malloc(sizeof *buffer + stride * height);
        if (buffer == NULL)
-- 
1.8.3.1

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