compositor: Fail output configuration on invalid transform

If an invalid transformation is provided for an output, fail the output
configuration rather than continuing on using whatever we chose as the
default transform.

After !383, this will result in configurations using the old definition
failing and exiting, rather than continuing on the wrong way around.

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

compositor/main.c

@@ -1208,7 +1208,7 @@ wet_output_set_scale(struct weston_output *output,
 /* UINT32_MAX is treated as invalid because 0 is a valid
  * enumeration value and the parameter is unsigned
  */
-static void
+static int
 wet_output_set_transform(struct weston_output *output,
 			 struct weston_config_section *section,
 			 uint32_t default_transform,
@@ -1226,6 +1226,7 @@ wet_output_set_transform(struct weston_output *output,
 		if (weston_parse_transform(t, &transform) < 0) {
 			weston_log("Invalid transform \"%s\" for output %s\n",
 				   t, output->name);
+			return -1;
 		}
 		free(t);
 	}
@@ -1234,6 +1235,8 @@ wet_output_set_transform(struct weston_output *output,
 		transform = parsed_transform;
 
 	weston_output_set_transform(output, transform);
+
+	return 0;
 }
 
 static void
@@ -1295,7 +1298,10 @@ wet_configure_windowed_output_from_config(struct weston_output *output,
 		height = parsed_options->height;
 
 	wet_output_set_scale(output, section, defaults->scale, parsed_options->scale);
-	wet_output_set_transform(output, section, defaults->transform, parsed_options->transform);
+	if (wet_output_set_transform(output, section, defaults->transform,
+				     parsed_options->transform) < 0) {
+		return -1;
+	}
 
 	if (api->output_set_size(output, width, height) < 0) {
 		weston_log("Cannot configure output \"%s\" using weston_windowed_output_api.\n",
@@ -1726,7 +1732,11 @@ drm_backend_output_configure(struct weston_output *output,
 	free(modeline);
 
 	wet_output_set_scale(output, section, 1, 0);
-	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL, UINT32_MAX);
+	if (wet_output_set_transform(output, section,
+				     WL_OUTPUT_TRANSFORM_NORMAL,
+				     UINT32_MAX) < 0) {
+		return -1;
+	}
 
 	weston_config_section_get_string(section,
 					 "gbm-format", &gbm_format, NULL);
@@ -2221,8 +2231,11 @@ drm_backend_remoted_output_configure(struct weston_output *output,
 	}
 
 	wet_output_set_scale(output, section, 1, 0);
-	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL,
+	if (wet_output_set_transform(output, section,
-				 UINT32_MAX);
+				     WL_OUTPUT_TRANSFORM_NORMAL,
+				     UINT32_MAX) < 0) {
+		return -1;
+	};
 
 	weston_config_section_get_string(section, "gbm-format", &gbm_format,
 					 NULL);
@@ -2369,8 +2382,11 @@ drm_backend_pipewire_output_configure(struct weston_output *output,
 	}
 
 	wet_output_set_scale(output, section, 1, 0);
-	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL,
+	if (wet_output_set_transform(output, section,
-				 UINT32_MAX);
+				     WL_OUTPUT_TRANSFORM_NORMAL,
+				     UINT32_MAX) < 0) {
+		return -1;
+	}
 
 	weston_config_section_get_string(section, "seat", &seat, "");
 
@@ -2712,7 +2728,12 @@ fbdev_backend_output_configure(struct weston_output *output)
 
 	section = weston_config_get_section(wc, "output", "name", "fbdev");
 
-	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL, UINT32_MAX);
+	if (wet_output_set_transform(output, section,
+				     WL_OUTPUT_TRANSFORM_NORMAL,
+				     UINT32_MAX) < 0) {
+		return -1;
+	}
+
 	weston_output_set_scale(output, 1);
 
 	return 0;