Add wp_content_type_v1 protocol support

The wp_content_type_v1 protocol allow the Wayland client to describe the kind
of content a surface will display, to allow the compositor to optimize its
behavior for it.

See
    https://wayland.app/protocols/content-type-v1
    https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/117

Implementation here sets the content type to PHOTO, only if the compositor
advertises this protocol, otherwise, log nothing to the user.

Signed-off-by: nferhat <[email protected]>

meson.build

@@ -119,6 +119,21 @@ xdg_shell_h = custom_target(
   command: [wl_scanner, 'client-header', '@INPUT@', '@OUTPUT@'],
 )
 
+# wp_content_type_v1 Wayland protocol
+wp_content_type_v1_xml = wlproto_dir / 'staging/content-type/content-type-v1.xml'
+wp_content_type_v1_c = custom_target(
+  'wp-content-type-v1-protocol.c',
+  output: 'wp-content-type-v1-protocol.c',
+  input: wp_content_type_v1_xml,
+  command: [wl_scanner, 'private-code', '@INPUT@', '@OUTPUT@']
+)
+wp_content_type_v1_h = custom_target(
+  'wp-content-type-v1-protocol.h',
+  output: 'wp-content-type-v1-protocol.h',
+  input: wp_content_type_v1_xml,
+  command: [wl_scanner, 'client-header', '@INPUT@', '@OUTPUT@']
+)
+
 # install sample config
 install_data('extra/swayimgrc', install_dir: get_option('datadir') / 'swayimg')
 
@@ -194,6 +209,8 @@ sources = [
   'src/formats/tga.c',
   xdg_shell_h,
   xdg_shell_c,
+  wp_content_type_v1_h,
+  wp_content_type_v1_c,
 ]
 if exif.found()
   sources += 'src/exif.c'

src/ui.c

@@ -8,6 +8,7 @@
 #include "buildcfg.h"
 #include "config.h"
 #include "xdg-shell-protocol.h"
+#include "wp-content-type-v1-protocol.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ -50,6 +51,7 @@ struct ui {
         struct wl_keyboard* keyboard;
         struct wl_pointer* pointer;
         struct wl_surface* surface;
+        struct wp_content_type_manager_v1* content_type_manager;
         struct wl_output* output;
     } wl;
 
@@ -600,6 +602,8 @@ static void on_registry_global(void* data, struct wl_registry* registry,
     } else if (strcmp(interface, wl_seat_interface.name) == 0) {
         ctx.wl.seat = wl_registry_bind(registry, name, &wl_seat_interface, 4);
         wl_seat_add_listener(ctx.wl.seat, &seat_listener, data);
+    } else if (strcmp(interface, wp_content_type_manager_v1_interface.name) == 0) {
+        ctx.wl.content_type_manager = wl_registry_bind(registry, name, &wp_content_type_manager_v1_interface, 1);
     }
 }
 
@@ -679,6 +683,12 @@ bool ui_init(const char* app_id, size_t width, size_t height)
         xdg_toplevel_set_fullscreen(ctx.xdg.toplevel, NULL);
     }
 
+    if (ctx.wl.content_type_manager) {
+        struct wp_content_type_v1* content_type;
+        content_type = wp_content_type_manager_v1_get_surface_content_type(ctx.wl.content_type_manager, ctx.wl.surface);
+        wp_content_type_v1_set_content_type(content_type, WP_CONTENT_TYPE_V1_TYPE_PHOTO);
+    }
+
     wl_surface_commit(ctx.wl.surface);
 
     app_watch(wl_display_get_fd(ctx.wl.display), on_wayland_event, NULL);
@@ -735,6 +745,9 @@ void ui_destroy(void)
     if (ctx.wl.compositor) {
         wl_compositor_destroy(ctx.wl.compositor);
     }
+    if (ctx.wl.content_type_manager) {
+        wp_content_type_manager_v1_destroy(ctx.wl.content_type_manager);
+    }
     if (ctx.wl.registry) {
         wl_registry_destroy(ctx.wl.registry);
     }