shm: Add API for renderers to register additional pixel formats

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

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 {
@@ -711,6 +713,8 @@ 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);
@@ -1168,3 +1172,18 @@ 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;
+}

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,

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) {
+	if (!format_is_supported(client, format)) {
-	case WL_SHM_FORMAT_ARGB8888:
-	case WL_SHM_FORMAT_XRGB8888:
-		break;
-	default:
 		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
@@ -271,13 +295,8 @@ wl_shm_buffer_create(struct wl_client *client,
 {
 	struct wl_shm_buffer *buffer;
 
-	switch (format) {
+	if (!format_is_supported(client, format))
-	case WL_SHM_FORMAT_ARGB8888:
-	case WL_SHM_FORMAT_XRGB8888:
-		break;
-	default:
 		return NULL;
-	}
 
 	buffer = malloc(sizeof *buffer + stride * height);
 	if (buffer == NULL)