winewayland.drv: Add skeleton data device format infrastructure.

Introduce infrastructure to convert clipboard/drag-and-drop data
between what Wayland understands and what Wine understands.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

dlls/winewayland.drv/Makefile.in

@@ -22,6 +22,7 @@ C_SRCS = \
 	wayland_cursor.c \
 	wayland_data_device.c \
 	wayland_data_device_dll.c \
+	wayland_data_device_format.c \
 	wayland_dmabuf.c \
 	wayland_keyboard.c \
 	wayland_keyboard_layout.c \

dlls/winewayland.drv/wayland_data_device_format.c

+/*
+ * Wayland data device format handling
+ *
+ * Copyright (c) 2020 Alexandros Frantzis for Collabora Ltd
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#if 0
+#pragma makedep unix
+#endif
+
+#include "config.h"
+
+#include "waylanddrv.h"
+
+#include "winternl.h"
+
+/* Order is important. When selecting a mime-type for a clipboard format we
+ * will choose the first entry that matches the specified clipboard format. */
+static struct wayland_data_device_format supported_formats[] =
+{
+    {NULL, 0, NULL, NULL, NULL, 0},
+};
+
+static ATOM register_clipboard_format(const WCHAR *name)
+{
+    ATOM atom;
+    if (NtAddAtom(name, lstrlenW(name) * sizeof(WCHAR), &atom)) return 0;
+    return atom;
+}
+
+void wayland_data_device_init_formats(void)
+{
+    struct wayland_data_device_format *format = supported_formats;
+
+    while (format->mime_type)
+    {
+        if (format->clipboard_format == 0)
+            format->clipboard_format = register_clipboard_format(format->register_name);
+        format++;
+    }
+}
+
+struct wayland_data_device_format *wayland_data_device_format_for_mime_type(const char *mime)
+{
+    struct wayland_data_device_format *format = supported_formats;
+
+    while (format->mime_type)
+    {
+        if (!strcmp(mime, format->mime_type))
+            return format;
+        format++;
+    }
+
+    return NULL;
+}
+
+static BOOL string_array_contains(struct wl_array *array, const char *str)
+{
+    char **p;
+
+    wl_array_for_each(p, array)
+        if (!strcmp(*p, str)) return TRUE;
+
+    return FALSE;
+}
+
+struct wayland_data_device_format *wayland_data_device_format_for_clipboard_format(UINT clipboard_format,
+                                                                                   struct wl_array *mimes)
+{
+    struct wayland_data_device_format *format = supported_formats;
+
+    while (format->mime_type)
+    {
+        if (format->clipboard_format == clipboard_format &&
+            (!mimes || string_array_contains(mimes, format->mime_type)))
+        {
+             return format;
+        }
+        format++;
+    }
+
+    return NULL;
+}

dlls/winewayland.drv/waylanddrv.h

@@ -246,6 +246,19 @@ struct wayland_data_device
     struct wl_data_offer *dnd_wl_data_offer;
 };
 
+struct wayland_data_device_format
+{
+    const char *mime_type;
+    UINT clipboard_format;
+    const WCHAR *register_name;
+    /* In case of failure, 'ret_size' is left unchanged. */
+    void *(*import)(struct wayland_data_device_format *format,
+                    const void *data, size_t data_size, size_t *ret_size);
+    void (*export)(struct wayland_data_device_format *format, int fd,
+                   void *data, size_t size);
+    UINT_PTR extra;
+};
+
 struct wayland
 {
     struct wl_list thread_link;
@@ -692,6 +705,10 @@ void wayland_data_device_init(struct wayland_data_device *data_device,
                               struct wayland *wayland) DECLSPEC_HIDDEN;
 void wayland_data_device_deinit(struct wayland_data_device *data_device) DECLSPEC_HIDDEN;
 void wayland_data_device_ensure_clipboard_window(struct wayland *wayland) DECLSPEC_HIDDEN;
+void wayland_data_device_init_formats(void) DECLSPEC_HIDDEN;
+struct wayland_data_device_format *wayland_data_device_format_for_mime_type(const char *mime) DECLSPEC_HIDDEN;
+struct wayland_data_device_format *wayland_data_device_format_for_clipboard_format(UINT clipboard_format,
+                                                                                   struct wl_array *mimes) DECLSPEC_HIDDEN;
 
 /**********************************************************************
  *          Registry helpers

dlls/winewayland.drv/waylanddrv_main.c

@@ -200,6 +200,8 @@ static NTSTATUS waylanddrv_unix_init(void *arg)
 
     wayland_read_options_from_registry();
 
+    wayland_data_device_init_formats();
+
     if (!wayland_init_set_cursor()) goto err;
 
     if (!wayland_process_init()) goto err;