tests: add scale and transform compositor options

With these, a test can initialize the headless-backend with non-default scale
and transform which allows testing output scales and transforms.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

tests/weston-test-fixture-compositor.c

@@ -107,6 +107,8 @@ compositor_setup_defaults_(struct compositor_setup *setup,
 		.xwayland = false,
 		.width = 320,
 		.height = 240,
+		.scale = 1,
+		.transform = WL_OUTPUT_TRANSFORM_NORMAL,
 		.config_file = NULL,
 		.extra_module = NULL,
 		.logging_scopes = NULL,
@@ -163,6 +165,24 @@ shell_to_str(enum shell_type t)
 	return names[t];
 }
 
+static const char *
+transform_to_str(enum wl_output_transform t)
+{
+	static const char * const names[] = {
+		[WL_OUTPUT_TRANSFORM_NORMAL] = "normal",
+		[WL_OUTPUT_TRANSFORM_90] = "rotate-90",
+		[WL_OUTPUT_TRANSFORM_180] = "rotate-180",
+		[WL_OUTPUT_TRANSFORM_270] = "rotate-270",
+		[WL_OUTPUT_TRANSFORM_FLIPPED] = "flipped",
+		[WL_OUTPUT_TRANSFORM_FLIPPED_90] = "flipped-rotate-90",
+		[WL_OUTPUT_TRANSFORM_FLIPPED_180] = "flipped-rotate-180",
+		[WL_OUTPUT_TRANSFORM_FLIPPED_270] = "flipped-rotate-270",
+	};
+
+	assert(t < ARRAY_LENGTH(names) && names[t]);
+	return names[t];
+}
+
 /** Execute compositor
  *
  * Manufactures the compositor command line and calls wet_main().
@@ -259,6 +279,17 @@ execute_compositor(const struct compositor_setup *setup,
 	asprintf(&tmp, "--height=%d", setup->height);
 	prog_args_take(&args, tmp);
 
+	if (setup->scale != 1) {
+		asprintf(&tmp, "--scale=%d", setup->scale);
+		prog_args_take(&args, tmp);
+	}
+
+	if (setup->transform != WL_OUTPUT_TRANSFORM_NORMAL) {
+		asprintf(&tmp, "--transform=%s",
+			 transform_to_str(setup->transform));
+		prog_args_take(&args, tmp);
+	}
+
 	if (setup->config_file) {
 		asprintf(&tmp, "--config=%s", setup->config_file);
 		prog_args_take(&args, tmp);

tests/weston-test-fixture-compositor.h

@@ -26,6 +26,7 @@
 #ifndef WESTON_TEST_FIXTURE_COMPOSITOR_H
 #define WESTON_TEST_FIXTURE_COMPOSITOR_H
 
+#include <wayland-client-protocol.h>
 #include <libweston/libweston.h>
 
 #include "weston-testsuite-data.h"
@@ -82,6 +83,10 @@ struct compositor_setup {
 	unsigned width;
 	/** Default output height. */
 	unsigned height;
+	/** Default output scale. */
+	int scale;
+	/** Default output transform, one of WL_OUTPUT_TRANSFORM_*. */
+	enum wl_output_transform transform;
 	/** The absolute path to \c weston.ini to use,
 	 * or NULL for \c --no-config . */
 	const char *config_file;
@@ -109,6 +114,8 @@ compositor_setup_defaults_(struct compositor_setup *setup,
  * - xwayland: no
  * - width: 320
  * - height: 240
+ * - scale: 1
+ * - transform: WL_OUTPUT_TRANSFORM_NORMAL
  * - config_file: none
  * - extra_module: none
  * - logging_scopes: compositor defaults