Upgrade compositor to v6 with output-aware surface preferences

scripts/tests/fixtures/surface-preferences.c

@@ -0,0 +1,89 @@
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include "fractional-scale-client-protocol.h"
+
+static struct wl_compositor *compositor;
+static struct wp_fractional_scale_manager_v1 *manager;
+static uint32_t version, fractional, fractional_events;
+static int32_t integer_scale = 1, transform;
+static unsigned scale_events, transform_events;
+
+static void global(void *data, struct wl_registry *registry, uint32_t name,
+                   const char *interface, uint32_t advertised) {
+    (void)data;
+    if (!strcmp(interface, "wl_compositor")) {
+        assert(advertised >= 6);
+        compositor = wl_registry_bind(registry, name, &wl_compositor_interface, version);
+    } else if (!strcmp(interface, "wp_fractional_scale_manager_v1")) {
+        manager = wl_registry_bind(registry, name, &wp_fractional_scale_manager_v1_interface, 1);
+    }
+}
+
+static void removed(void *data, struct wl_registry *registry, uint32_t name) {
+    (void)data; (void)registry; (void)name;
+}
+
+static void scale(void *data, struct wl_surface *surface, int32_t value) {
+    (void)data; (void)surface;
+    integer_scale = value;
+    scale_events++;
+}
+
+static void transformed(void *data, struct wl_surface *surface, uint32_t value) {
+    (void)data; (void)surface;
+    transform = (int32_t)value;
+    transform_events++;
+}
+
+static void preferred(void *data, struct wp_fractional_scale_v1 *object, uint32_t value) {
+    (void)data; (void)object;
+    fractional = value;
+    fractional_events++;
+}
+
+int main(int argc, char **argv) {
+    assert(argc == 2);
+    version = (uint32_t)atoi(argv[1]);
+    struct wl_display *display = wl_display_connect(NULL);
+    assert(display);
+    struct wl_registry *registry = wl_display_get_registry(display);
+    const struct wl_registry_listener registry_listener = {global, removed};
+    wl_registry_add_listener(registry, &registry_listener, NULL);
+    assert(wl_display_roundtrip(display) >= 0 && compositor && manager);
+    struct wl_surface *surface = wl_compositor_create_surface(compositor);
+    const struct wl_surface_listener listener = {
+        .preferred_buffer_scale = scale,
+        .preferred_buffer_transform = transformed,
+    };
+    wl_surface_add_listener(surface, &listener, NULL);
+    assert(wl_display_roundtrip(display) >= 0);
+    // Create the fractional object after the compositor cached its preference.
+    struct wp_fractional_scale_v1 *object =
+        wp_fractional_scale_manager_v1_get_fractional_scale(manager, surface);
+    const struct wp_fractional_scale_v1_listener fractional_listener = {preferred};
+    wp_fractional_scale_v1_add_listener(object, &fractional_listener, NULL);
+    assert(wl_display_roundtrip(display) >= 0);
+    assert(fractional > 0 && fractional_events == 1);
+    if (version >= 6) {
+        assert(integer_scale == (int32_t)((fractional + 119) / 120));
+        assert(scale_events == (integer_scale != 1 ? 1u : 0u));
+        assert(transform_events == (transform != 0 ? 1u : 0u));
+    } else {
+        assert(scale_events == 0 && transform_events == 0);
+    }
+    for (int i = 0; i < 3; i++) {
+        wl_surface_commit(surface);
+        assert(wl_display_roundtrip(display) >= 0);
+    }
+    assert(fractional_events == 1);
+    assert(scale_events == (version >= 6 && integer_scale != 1 ? 1u : 0u));
+    assert(transform_events == (version >= 6 && transform != 0 ? 1u : 0u));
+    wp_fractional_scale_v1_destroy(object);
+    wl_surface_destroy(surface);
+    wl_display_roundtrip(display);
+    wl_display_disconnect(display);
+    return 0;
+}