scene-graph: Use weston_buffer's format/modifier info to print

Now that we have this generically available, use it rather than calling
into per-buffer getters.

Signed-off-by: Daniel Stone <daniels@collabora.com>

libweston/compositor.c

@@ -7487,11 +7487,6 @@ static void
 debug_scene_view_print_buffer(FILE *fp, struct weston_view *view)
 {
 	struct weston_buffer *buffer = view->surface->buffer_ref.buffer;
-	struct wl_shm_buffer *shm = buffer->shm_buffer;
-	struct linux_dmabuf_buffer *dmabuf = buffer->dmabuf;
-	const struct pixel_format_info *pixel_info = NULL;
-	uint32_t _format;
-	uint64_t modifier;
 	char *modifier_name;
 
 	if (!buffer) {
@@ -7501,30 +7496,27 @@ debug_scene_view_print_buffer(FILE *fp, struct weston_view *view)
 
 	switch (buffer->type) {
 	case WESTON_BUFFER_SHM:
-		_format = wl_shm_buffer_get_format(shm);
-		pixel_info = pixel_format_get_info_shm(_format);
 		fprintf(fp, "\t\tSHM buffer\n");
-		fprintf(fp, "\t\t\tformat: 0x%lx %s\n",
-			(unsigned long) _format,
-			pixel_info ? pixel_info->drm_format_name : "UNKNOWN");
 		break;
 	case WESTON_BUFFER_DMABUF:
-		modifier = dmabuf->attributes.modifier[0];
-		modifier_name = pixel_format_get_modifier(modifier);
-		pixel_info = pixel_format_get_info(dmabuf->attributes.format);
 		fprintf(fp, "\t\tdmabuf buffer\n");
-		fprintf(fp, "\t\t\tformat: 0x%lx %s\n",
-			(unsigned long) dmabuf->attributes.format,
-			pixel_info ? pixel_info->drm_format_name : "UNKNOWN");
-
-		fprintf(fp, "\t\t\tmodifier: %s\n", modifier_name ? modifier_name :
-				"Failed to convert to a modifier name");
-		free(modifier_name);
 		break;
 	default:
-		fprintf(fp, "\t\tEGL buffer\n");
+		fprintf(fp, "\t\tEGL buffer:\n");
+		fprintf(fp, "\t\t\t[format may be inaccurate]\n");
 		break;
 	}
+
+	fprintf(fp, "\t\t\tformat: 0x%lx %s\n",
+		(unsigned long) buffer->pixel_format,
+		buffer->pixel_format ?
+			buffer->pixel_format->drm_format_name : "UNKNOWN");
+
+	modifier_name = pixel_format_get_modifier(buffer->format_modifier);
+	fprintf(fp, "\t\t\tmodifier: %s\n",
+		modifier_name ?
+			modifier_name : "Failed to convert to a modifier name");
+	free(modifier_name);
 }
 
 static void